package scriptorium_test

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"math"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"testing"
	"testing/fstest"

	"gitea.maximumdirect.net/eric/scriptorium"
)

func TestNewEngineRejectsMissingPromptDir(t *testing.T) {
	_, err := scriptorium.NewEngine(scriptorium.Config{ProfileDir: "./examples/profiles"})
	if !errors.Is(err, scriptorium.ErrInvalidConfig) {
		t.Fatalf("expected ErrInvalidConfig, got %v", err)
	}
}

func TestNewEngineAcceptsMissingProfileDir(t *testing.T) {
	_, err := scriptorium.NewEngine(scriptorium.Config{PromptDir: "./examples/prompts"})
	if err != nil {
		t.Fatalf("expected missing profile dir to use built-ins, got %v", err)
	}
}

func TestPrepareWorksWithExampleDirectoriesAndFileInputs(t *testing.T) {
	engine := newExampleEngine(t)

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID: "generic.markdown_summary",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.File("./examples/fixtures/transcript.md"),
			"glossary":   scriptorium.File("./examples/fixtures/glossary.yml"),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}
	if prepared.PromptID != "generic.markdown_summary" {
		t.Fatalf("unexpected prompt id: %q", prepared.PromptID)
	}
	if prepared.SelectedProfileID != "local-fast" {
		t.Fatalf("unexpected selected profile: %q", prepared.SelectedProfileID)
	}
	if prepared.EffectiveModelParams.Model != "gpt-4o-mini" {
		t.Fatalf("unexpected effective model: %q", prepared.EffectiveModelParams.Model)
	}
	if len(prepared.Messages) != 2 {
		t.Fatalf("expected rendered messages, got %d", len(prepared.Messages))
	}
	if prepared.InputHashes["transcript"] == "" || prepared.InputHashes["glossary"] == "" {
		t.Fatalf("expected input hashes, got %#v", prepared.InputHashes)
	}
}

func TestPrepareWorksWithInlineInputs(t *testing.T) {
	engine := newExampleEngine(t)

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID: "generic.markdown_summary",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin scouts the tower.\nKara lights a lantern."),
			"glossary":   scriptorium.InlineWithURI("memory://glossary.yml", "party:\n  - Rin\n  - Kara\n"),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}
	if len(prepared.Messages) != 2 {
		t.Fatalf("expected rendered messages, got %d", len(prepared.Messages))
	}
	rendered := prepared.Messages[1].Content
	if !strings.Contains(rendered, "Rin scouts the tower.") || !strings.Contains(rendered, "party:") {
		t.Fatalf("expected inline inputs in rendered prompt, got %q", rendered)
	}
}

func TestPreparedRunJSONDoesNotExposeSecretOrTargetPresence(t *testing.T) {
	const envName = "SCRIPTORIUM_API_KEY"
	const secret = "public-api-test-secret"
	t.Setenv(envName, secret)

	engine := newExampleEngine(t)
	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID: "generic.structured_events",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.File("./examples/fixtures/transcript.md"),
			"glossary":   scriptorium.File("./examples/fixtures/glossary.yml"),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}

	payload, err := json.Marshal(prepared)
	if err != nil {
		t.Fatalf("expected prepared run to marshal, got %v", err)
	}
	out := string(payload)
	if strings.Contains(out, secret) {
		t.Fatalf("prepared run JSON leaked raw API key value: %s", out)
	}
	if !strings.Contains(out, envName) {
		t.Fatalf("prepared run JSON should retain api_key_env name, got %s", out)
	}
	for _, forbidden := range []string{"TargetPresence", "target_presence"} {
		if strings.Contains(out, forbidden) {
			t.Fatalf("prepared run JSON exposed internal target presence metadata %q: %s", forbidden, out)
		}
	}
}

func TestRunRequestFormattingRedactsDirectAPIKey(t *testing.T) {
	const secret = "run-request-secret"
	req := scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "local-fast",
		APIKey:    secret,
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
		},
	}

	for _, formatted := range []string{
		fmt.Sprint(req),
		fmt.Sprintf("%+v", req),
		fmt.Sprintf("%#v", req),
	} {
		if strings.Contains(formatted, secret) {
			t.Fatalf("formatted RunRequest leaked API key: %s", formatted)
		}
		if !strings.Contains(formatted, "APIKeySet:true") {
			t.Fatalf("formatted RunRequest should indicate an API key is set, got %s", formatted)
		}
	}

	payload, err := json.Marshal(req)
	if err != nil {
		t.Fatalf("expected RunRequest to marshal, got %v", err)
	}
	if strings.Contains(string(payload), secret) {
		t.Fatalf("RunRequest JSON leaked API key: %s", payload)
	}
}

func TestGenerateRequestFormattingRedactsDirectAPIKey(t *testing.T) {
	const secret = "generate-request-secret"
	req := scriptorium.GenerateRequest{
		Prompt: scriptorium.RenderedPrompt{Messages: []scriptorium.RenderedMessage{
			{Role: "user", Content: "secret prompt content"},
		}},
		Target: scriptorium.ExecutionTarget{
			Model: "test-model",
			ExtraParams: map[string]any{
				"provider_option": "on",
			},
		},
		APIKey: secret,
	}

	for _, formatted := range []string{
		fmt.Sprint(req),
		fmt.Sprintf("%+v", req),
		fmt.Sprintf("%#v", req),
	} {
		if strings.Contains(formatted, secret) {
			t.Fatalf("formatted GenerateRequest leaked API key: %s", formatted)
		}
		if strings.Contains(formatted, "secret prompt content") {
			t.Fatalf("formatted GenerateRequest leaked prompt content: %s", formatted)
		}
		if !strings.Contains(formatted, "APIKeySet:true") {
			t.Fatalf("formatted GenerateRequest should indicate an API key is set, got %s", formatted)
		}
	}

	payload, err := json.Marshal(req)
	if err != nil {
		t.Fatalf("expected GenerateRequest to marshal, got %v", err)
	}
	if strings.Contains(string(payload), secret) {
		t.Fatalf("GenerateRequest JSON leaked API key: %s", payload)
	}
}

func TestPreparePreservesExplicitZeroExecutionOverrides(t *testing.T) {
	engine := newExampleEngine(t)
	zeroFloat := 0.0
	zeroInt := 0

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID: "generic.markdown_summary",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.File("./examples/fixtures/transcript.md"),
			"glossary":   scriptorium.File("./examples/fixtures/glossary.yml"),
		},
		Execution: &scriptorium.ExecutionTargetOverride{
			Temperature:    &zeroFloat,
			MaxTokens:      &zeroInt,
			TopP:           &zeroFloat,
			TimeoutSeconds: &zeroInt,
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}
	target := prepared.EffectiveModelParams
	if target.Temperature != 0 || target.MaxTokens != 0 || target.TopP != 0 || target.TimeoutSeconds != 0 {
		t.Fatalf("expected explicit zero overrides in effective target, got %+v", target)
	}
}

func TestRunSucceedsWithInjectedLLMClient(t *testing.T) {
	const envName = "SCRIPTORIUM_API_KEY"
	const secret = "run-secret-value"
	t.Setenv(envName, secret)

	fake := &fakeLLMClient{
		response: &scriptorium.GenerateResponse{
			Content: "# Summary\n\nDone.",
			Usage: scriptorium.TokenUsage{
				PromptTokens:     10,
				CompletionTokens: 5,
				TotalTokens:      15,
				CachedTokens:     3,
				CacheWriteTokens: 2,
			},
		},
	}
	engine := newExampleEngineWithOptions(t, "./examples/schemas", scriptorium.WithLLMClient(fake))

	result, err := engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID: "generic.markdown_summary",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
		Execution: &scriptorium.ExecutionTargetOverride{
			APIKeyEnv: envName,
		},
	})
	if err != nil {
		t.Fatalf("expected run to succeed, got %v", err)
	}
	if result.RunID == "" {
		t.Fatalf("expected run id")
	}
	if result.RawOutput != fake.response.Content {
		t.Fatalf("unexpected raw output: %q", result.RawOutput)
	}
	if string(result.Artifact.Body) != fake.response.Content {
		t.Fatalf("unexpected artifact body: %q", string(result.Artifact.Body))
	}
	if result.Artifact.ContentType != "text/markdown" {
		t.Fatalf("unexpected artifact content type: %q", result.Artifact.ContentType)
	}
	if result.Validation.Status != scriptorium.ValidationPassed || !result.Validation.IsValid {
		t.Fatalf("expected passed validation, got %+v", result.Validation)
	}
	if result.PromptID != "generic.markdown_summary" || result.SelectedProfileID != "local-fast" || result.ModelName != "gpt-4o-mini" {
		t.Fatalf("unexpected run metadata: %+v", result)
	}
	if result.Usage.TotalTokens != 15 || result.Usage.CachedTokens != 3 || result.Usage.CacheWriteTokens != 2 {
		t.Fatalf("unexpected usage: %+v", result.Usage)
	}

	payload, err := json.Marshal(result)
	if err != nil {
		t.Fatalf("expected run result to marshal, got %v", err)
	}
	if strings.Contains(string(payload), secret) {
		t.Fatalf("run result JSON leaked raw API key value: %s", payload)
	}
}

func TestRunPassesPreparedRequestToInjectedLLMClient(t *testing.T) {
	const directKey = "direct-injected-key"
	fake := &fakeLLMClient{
		response: &scriptorium.GenerateResponse{Content: "ok"},
	}
	engine := newExampleEngineWithOptions(t, "./examples/schemas", scriptorium.WithLLMClient(fake))
	zeroFloat := 0.0
	zeroInt := 0

	_, err := engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID: "generic.markdown_summary",
		APIKey:   directKey,
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
		Execution: &scriptorium.ExecutionTargetOverride{
			Temperature:    &zeroFloat,
			MaxTokens:      &zeroInt,
			TopP:           &zeroFloat,
			TimeoutSeconds: &zeroInt,
		},
	})
	if err != nil {
		t.Fatalf("expected run to succeed, got %v", err)
	}
	if len(fake.requests) != 1 {
		t.Fatalf("expected one generate request, got %d", len(fake.requests))
	}
	req := fake.requests[0]
	if len(req.Prompt.Messages) != 2 || !strings.Contains(req.Prompt.Messages[1].Content, "Rin opens the gate.") {
		t.Fatalf("expected rendered prompt in generate request, got %+v", req.Prompt)
	}
	if req.Target.Model != "gpt-4o-mini" || req.Target.Temperature != 0 || req.Target.MaxTokens != 0 || req.Target.TopP != 0 || req.Target.TimeoutSeconds != 0 {
		t.Fatalf("unexpected effective target: %+v", req.Target)
	}
	if !req.TargetPresence.Temperature || !req.TargetPresence.MaxTokens || !req.TargetPresence.TopP || !req.TargetPresence.TimeoutSeconds {
		t.Fatalf("expected explicit zero target presence, got %+v", req.TargetPresence)
	}
	if req.StructuredOutput != nil {
		t.Fatalf("did not expect structured output for markdown prompt: %+v", req.StructuredOutput)
	}
	if req.APIKey != directKey {
		t.Fatalf("expected direct key on injected generate request")
	}
	payload, err := json.Marshal(req)
	if err != nil {
		t.Fatalf("expected generate request to marshal, got %v", err)
	}
	if strings.Contains(string(payload), directKey) {
		t.Fatalf("generate request JSON leaked direct API key: %s", payload)
	}
}

func TestRunUsesDirectAPIKeyWithDefaultLLMClient(t *testing.T) {
	const directKey = "direct-public-key"
	const missingEnv = "SCRIPTORIUM_PUBLIC_DIRECT_MISSING"
	t.Setenv(missingEnv, "")

	var gotAuth string
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotAuth = r.Header.Get("Authorization")
		if r.URL.Path != "/v1/chat/completions" {
			t.Errorf("unexpected path: %s", r.URL.Path)
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{
  "choices": [{"message": {"role": "assistant", "content": "# Summary\n\nDone."}}],
  "usage": {"prompt_tokens": 3, "completion_tokens": 4, "total_tokens": 7}
}`))
	}))
	defer server.Close()

	profileDir := t.TempDir()
	writePublicProfileFileWithAPIKeyEnv(t, profileDir, "direct-auth", server.URL+"/v1", "test-model", missingEnv)
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  "./examples/prompts",
		ProfileDir: profileDir,
		SchemaDir:  "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	result, err := engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "direct-auth",
		APIKey:    directKey,
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected run with direct API key to succeed, got %v", err)
	}
	if gotAuth != "Bearer "+directKey {
		t.Fatalf("unexpected Authorization header: %q", gotAuth)
	}
	if result.Usage.TotalTokens != 7 {
		t.Fatalf("unexpected usage: %+v", result.Usage)
	}

	payload, err := json.Marshal(result)
	if err != nil {
		t.Fatalf("expected run result to marshal, got %v", err)
	}
	if strings.Contains(string(payload), directKey) {
		t.Fatalf("run result JSON leaked direct API key: %s", payload)
	}
}

func TestPrepareDirectAPIKeyBypassesMissingEnvWithoutLeakingOrHashing(t *testing.T) {
	const missingEnv = "SCRIPTORIUM_PUBLIC_PREPARE_MISSING"
	const firstKey = "first-direct-key"
	const secondKey = "second-direct-key"
	t.Setenv(missingEnv, "")

	profileDir := t.TempDir()
	writePublicProfileFileWithAPIKeyEnv(t, profileDir, "direct-prepare", "http://localhost:8000/v1", "test-model", missingEnv)
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  "./examples/prompts",
		ProfileDir: profileDir,
		SchemaDir:  "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	baseReq := scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "direct-prepare",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	}
	firstReq := baseReq
	firstReq.APIKey = firstKey
	firstPrepared, err := engine.Prepare(context.Background(), firstReq)
	if err != nil {
		t.Fatalf("expected prepare with direct API key to succeed, got %v", err)
	}
	secondReq := baseReq
	secondReq.APIKey = secondKey
	secondPrepared, err := engine.Prepare(context.Background(), secondReq)
	if err != nil {
		t.Fatalf("expected prepare with alternate direct API key to succeed, got %v", err)
	}

	if firstPrepared.PromptHash != secondPrepared.PromptHash {
		t.Fatalf("direct API keys changed prompt hash: %q vs %q", firstPrepared.PromptHash, secondPrepared.PromptHash)
	}
	if firstPrepared.RenderedPromptHash != secondPrepared.RenderedPromptHash {
		t.Fatalf("direct API keys changed rendered prompt hash: %q vs %q", firstPrepared.RenderedPromptHash, secondPrepared.RenderedPromptHash)
	}

	payload, err := json.Marshal(firstPrepared)
	if err != nil {
		t.Fatalf("expected prepared run to marshal, got %v", err)
	}
	if strings.Contains(string(payload), firstKey) {
		t.Fatalf("prepared run JSON leaked direct API key: %s", payload)
	}
}

func TestMissingCredentialsFailClearlyWhenProfileRequiresAuth(t *testing.T) {
	const missingEnv = "SCRIPTORIUM_PUBLIC_AUTH_MISSING"
	t.Setenv(missingEnv, "")

	profileDir := t.TempDir()
	writePublicProfileFileWithAPIKeyEnv(t, profileDir, "requires-auth", "http://localhost:8000/v1", "test-model", missingEnv)
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  "./examples/prompts",
		ProfileDir: profileDir,
		SchemaDir:  "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	_, err = engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "requires-auth",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if !errors.Is(err, scriptorium.ErrInvalidRequest) {
		t.Fatalf("expected invalid request for missing credentials, got %v", err)
	}
	if err == nil || !strings.Contains(err.Error(), missingEnv) {
		t.Fatalf("expected missing env name in error, got %v", err)
	}
}

func TestRunValidationFailureReturnsResult(t *testing.T) {
	fake := &fakeLLMClient{
		response: &scriptorium.GenerateResponse{Content: ""},
	}
	engine := newExampleEngineWithOptions(t, "./examples/schemas", scriptorium.WithLLMClient(fake))

	result, err := engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID: "generic.markdown_summary",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected validation failure as successful result, got %v", err)
	}
	if result.Validation.Status != scriptorium.ValidationFailed || result.Validation.IsValid {
		t.Fatalf("expected failed validation result, got %+v", result.Validation)
	}
	if len(result.Validation.Errors) == 0 {
		t.Fatalf("expected validation errors")
	}
}

func TestPublicErrorsSupportErrorsIs(t *testing.T) {
	llmErr := errors.New("llm failed")

	tests := []struct {
		name      string
		req       scriptorium.RunRequest
		client    scriptorium.LLMClient
		schemaDir string
		want      error
	}{
		{
			name:   "invalid request",
			req:    scriptorium.RunRequest{},
			client: &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}},
			want:   scriptorium.ErrInvalidRequest,
		},
		{
			name:   "prompt not found",
			req:    scriptorium.RunRequest{PromptID: "missing.prompt"},
			client: &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}},
			want:   scriptorium.ErrPromptNotFound,
		},
		{
			name: "profile not found",
			req: scriptorium.RunRequest{
				PromptID:  "generic.markdown_summary",
				ProfileID: "missing-profile",
				Inputs: map[string]scriptorium.ArtifactRef{
					"transcript": scriptorium.Inline("Rin opens the gate."),
				},
			},
			client: &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}},
			want:   scriptorium.ErrProfileNotFound,
		},
		{
			name: "artifact load",
			req: scriptorium.RunRequest{
				PromptID: "generic.markdown_summary",
				Inputs: map[string]scriptorium.ArtifactRef{
					"transcript": scriptorium.File("./examples/fixtures/does-not-exist.md"),
				},
			},
			client: &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}},
			want:   scriptorium.ErrArtifactLoad,
		},
		{
			name: "prompt render",
			req: scriptorium.RunRequest{
				PromptID: "generic.markdown_summary",
			},
			client: &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}},
			want:   scriptorium.ErrPromptRender,
		},
		{
			name: "llm failure",
			req: scriptorium.RunRequest{
				PromptID: "generic.markdown_summary",
				Inputs: map[string]scriptorium.ArtifactRef{
					"transcript": scriptorium.Inline("Rin opens the gate."),
					"glossary":   scriptorium.Inline("gate: A guarded passage."),
				},
			},
			client: &fakeLLMClient{err: llmErr},
			want:   scriptorium.ErrLLMGenerate,
		},
		{
			name: "validation runtime failure",
			req: scriptorium.RunRequest{
				PromptID: "generic.structured_events",
				Inputs: map[string]scriptorium.ArtifactRef{
					"transcript": scriptorium.Inline("Rin opens the gate."),
				},
			},
			client:    &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: `{"events":[]}`}},
			schemaDir: t.TempDir(),
			want:      scriptorium.ErrValidation,
		},
	}

	t.Setenv("SCRIPTORIUM_API_KEY", "test-secret")
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			schemaDir := tc.schemaDir
			if schemaDir == "" {
				schemaDir = "./examples/schemas"
			}
			engine := newExampleEngineWithOptions(t, schemaDir, scriptorium.WithLLMClient(tc.client))
			_, err := engine.Run(context.Background(), tc.req)
			if !errors.Is(err, tc.want) {
				t.Fatalf("expected errors.Is(%v), got %v", tc.want, err)
			}
		})
	}
}

func TestSelectedProfileRawAPIKeyMapsToProfileLoad(t *testing.T) {
	profileDir := t.TempDir()
	if err := os.WriteFile(filepath.Join(profileDir, "raw.yaml"), []byte(`
id: raw-profile
endpoint: http://localhost:8000/v1
model: model
api_key: secret
`), 0644); err != nil {
		t.Fatal(err)
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  "./examples/prompts",
		ProfileDir: profileDir,
		SchemaDir:  "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	_, err = engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "raw-profile",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if !errors.Is(err, scriptorium.ErrProfileLoad) {
		t.Fatalf("expected ErrProfileLoad, got %v", err)
	}
	if errors.Is(err, scriptorium.ErrPromptLoad) {
		t.Fatalf("did not expect ErrPromptLoad, got %v", err)
	}
}

func TestSelectedProfileInvalidYAMLMapsToProfileLoad(t *testing.T) {
	profileDir := t.TempDir()
	if err := os.WriteFile(filepath.Join(profileDir, "broken.yaml"), []byte(`
id: broken-profile
unknown_field: true
`), 0644); err != nil {
		t.Fatal(err)
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  "./examples/prompts",
		ProfileDir: profileDir,
		SchemaDir:  "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	_, err = engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "broken-profile",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if !errors.Is(err, scriptorium.ErrProfileLoad) {
		t.Fatalf("expected ErrProfileLoad, got %v", err)
	}
	if errors.Is(err, scriptorium.ErrPromptLoad) {
		t.Fatalf("did not expect ErrPromptLoad, got %v", err)
	}
}

func TestPromptRepositoryReadFailureMapsToPromptLoad(t *testing.T) {
	missingPromptDir := filepath.Join(t.TempDir(), "missing-prompts")
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  missingPromptDir,
		ProfileDir: "./examples/profiles",
		SchemaDir:  "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	_, err = engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID: "generic.markdown_summary",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if !errors.Is(err, scriptorium.ErrPromptLoad) {
		t.Fatalf("expected ErrPromptLoad, got %v", err)
	}
	if errors.Is(err, scriptorium.ErrProfileLoad) {
		t.Fatalf("did not expect ErrProfileLoad, got %v", err)
	}
}

func TestSelectedProfileRepositoryReadFailureMapsToProfileLoad(t *testing.T) {
	missingProfileDir := filepath.Join(t.TempDir(), "missing-profiles")
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  "./examples/prompts",
		ProfileDir: missingProfileDir,
		SchemaDir:  "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	_, err = engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "local-fast",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if !errors.Is(err, scriptorium.ErrProfileLoad) {
		t.Fatalf("expected ErrProfileLoad, got %v", err)
	}
	if errors.Is(err, scriptorium.ErrPromptLoad) {
		t.Fatalf("did not expect ErrPromptLoad, got %v", err)
	}
}

func TestPrepareUsesBuiltInProfileWithoutProfileDir(t *testing.T) {
	t.Setenv("OPENROUTER_API_KEY", "test-key")
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "mistral-small-3",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected built-in profile prepare to succeed, got %v", err)
	}
	if prepared.SelectedProfileID != "mistral-small-3" {
		t.Fatalf("unexpected selected profile: %q", prepared.SelectedProfileID)
	}
	if prepared.EffectiveModelParams.Model != "mistralai/mistral-small-3.2-24b-instruct" {
		t.Fatalf("unexpected built-in model: %q", prepared.EffectiveModelParams.Model)
	}
}

func TestPromptDefaultProfileCanUseBuiltInProfile(t *testing.T) {
	t.Setenv("OPENROUTER_API_KEY", "test-key")
	promptDir := t.TempDir()
	writePublicPromptFile(t, promptDir, "prompt.builtin.default", "mistral-small-3")

	engine, err := scriptorium.NewEngine(scriptorium.Config{PromptDir: promptDir})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID: "prompt.builtin.default",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
		},
	})
	if err != nil {
		t.Fatalf("expected built-in default profile prepare to succeed, got %v", err)
	}
	if prepared.SelectedProfileID != "mistral-small-3" {
		t.Fatalf("unexpected selected profile: %q", prepared.SelectedProfileID)
	}
}

func TestCustomProfileOverridesBuiltInProfile(t *testing.T) {
	t.Setenv("OPENROUTER_API_KEY", "test-key")
	profileDir := t.TempDir()
	writePublicProfileFile(t, profileDir, "mistral-small-3", "http://localhost:8000/v1", "custom-model")

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  "./examples/prompts",
		ProfileDir: profileDir,
		SchemaDir:  "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "mistral-small-3",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected custom profile prepare to succeed, got %v", err)
	}
	if prepared.EffectiveModelParams.Model != "custom-model" {
		t.Fatalf("expected custom profile to override built-in, got %q", prepared.EffectiveModelParams.Model)
	}
}

func TestMalformedCustomProfileDoesNotFallbackToBuiltIn(t *testing.T) {
	t.Setenv("OPENROUTER_API_KEY", "test-key")
	profileDir := t.TempDir()
	if err := os.WriteFile(filepath.Join(profileDir, "mistral-small-3.yml"), []byte(`
id: mistral-small-3
endpoint: http://localhost:8000/v1
model: custom-model
unexpected: true
`), 0o644); err != nil {
		t.Fatal(err)
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  "./examples/prompts",
		ProfileDir: profileDir,
		SchemaDir:  "./examples/schemas",
	})
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	_, err = engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "mistral-small-3",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if !errors.Is(err, scriptorium.ErrProfileLoad) {
		t.Fatalf("expected custom profile load error, got %v", err)
	}
}

func TestPrepareWorksWithPromptFSAndRelativeContentFile(t *testing.T) {
	promptFS := fstest.MapFS{
		"assets/prompts/fs-summary.yaml": &fstest.MapFile{Data: []byte(`
id: fs.summary
version: "1.0.0"
default_profile: local-fast
inputs:
  - name: transcript
    required: true
messages:
  - role: user
    content_file: ./messages/summary.tmpl
output:
  format: text
  validation_mode: none
  repair_attempts: 0
`)},
		"assets/prompts/messages/summary.tmpl": &fstest.MapFile{Data: []byte(`Summarize {{input "transcript"}} from prompt fs.`)},
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  t.TempDir(),
		ProfileDir: "./examples/profiles",
		SchemaDir:  "./examples/schemas",
	}, scriptorium.WithPromptFS(promptFS, "assets/prompts"))
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID: "fs.summary",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}
	if len(prepared.Messages) != 1 || !strings.Contains(prepared.Messages[0].Content, "prompt fs") {
		t.Fatalf("expected content_file body from prompt fs, got %+v", prepared.Messages)
	}
}

func TestPrepareWorksWithPromptFile(t *testing.T) {
	promptDir := t.TempDir()
	promptPath := filepath.Join(promptDir, "single.yaml")
	if err := os.WriteFile(promptPath, []byte(`
id: single.file.prompt
version: "1.0.0"
default_profile: local-fast
inputs:
  - name: transcript
    required: true
messages:
  - role: user
    content: "Summarize {{input \"transcript\"}} from file."
output:
  format: text
  validation_mode: none
  repair_attempts: 0
`), 0o644); err != nil {
		t.Fatal(err)
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		ProfileDir: "./examples/profiles",
		SchemaDir:  "./examples/schemas",
	}, scriptorium.WithPromptFile(promptPath))
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID: "single.file.prompt",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}
	if prepared.PromptID != "single.file.prompt" {
		t.Fatalf("unexpected prompt id: %q", prepared.PromptID)
	}
}

func TestPrepareWorksWithProfileFSOverBuiltIns(t *testing.T) {
	profileFS := fstest.MapFS{
		"profiles/mistral-small-3.yaml": &fstest.MapFile{Data: []byte(`
id: mistral-small-3
endpoint: http://profile-fs/v1
model: profile-fs-model
`)},
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	}, scriptorium.WithProfileFS(profileFS, "profiles"))
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "mistral-small-3",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}
	if prepared.EffectiveModelParams.Model != "profile-fs-model" {
		t.Fatalf("expected profile fs to override built-in, got %q", prepared.EffectiveModelParams.Model)
	}
}

func TestPrepareWorksWithProfileFileOverBuiltIns(t *testing.T) {
	profileDir := t.TempDir()
	profilePath := filepath.Join(profileDir, "mistral-small-3.yaml")
	if err := os.WriteFile(profilePath, []byte(`
id: mistral-small-3
endpoint: http://profile-file/v1
model: profile-file-model
`), 0o644); err != nil {
		t.Fatal(err)
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	}, scriptorium.WithProfileFile(profilePath))
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "mistral-small-3",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}
	if prepared.EffectiveModelParams.Model != "profile-file-model" {
		t.Fatalf("expected profile file to override built-in, got %q", prepared.EffectiveModelParams.Model)
	}
}

func TestPrepareWorksWithInMemoryProfilesWithoutProfileFiles(t *testing.T) {
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	}, scriptorium.WithProfiles(scriptorium.Profile{
		ID:       "memory-profile",
		Endpoint: "http://memory-profile/v1",
		Model:    "memory-model",
	}))
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "memory-profile",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}
	if prepared.EffectiveModelParams.Model != "memory-model" {
		t.Fatalf("expected in-memory profile model, got %q", prepared.EffectiveModelParams.Model)
	}
}

func TestInMemoryProfilesOverrideBuiltInsAndProfileSources(t *testing.T) {
	profileFS := fstest.MapFS{
		"profiles/mistral-small-3.yaml": &fstest.MapFile{Data: []byte(`
id: mistral-small-3
endpoint: http://profile-fs/v1
model: profile-fs-model
`)},
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	},
		scriptorium.WithProfileFS(profileFS, "profiles"),
		scriptorium.WithProfiles(scriptorium.Profile{
			ID:       "mistral-small-3",
			Endpoint: "http://memory-profile/v1",
			Model:    "memory-profile-model",
		}),
	)
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "mistral-small-3",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare to succeed, got %v", err)
	}
	if prepared.EffectiveModelParams.Model != "memory-profile-model" {
		t.Fatalf("expected in-memory profile to have highest precedence, got %q", prepared.EffectiveModelParams.Model)
	}
}

func TestWithProfilesRejectsDuplicateIDs(t *testing.T) {
	_, err := scriptorium.NewEngine(scriptorium.Config{PromptDir: "./examples/prompts"},
		scriptorium.WithProfiles(
			scriptorium.Profile{ID: "duplicate", Endpoint: "http://one/v1", Model: "one"},
			scriptorium.Profile{ID: "duplicate", Endpoint: "http://two/v1", Model: "two"},
		),
	)
	if !errors.Is(err, scriptorium.ErrInvalidConfig) {
		t.Fatalf("expected ErrInvalidConfig, got %v", err)
	}
}

func TestOpenAICompatibleProfileRunsThroughNormalProfilePath(t *testing.T) {
	fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}}
	prof := scriptorium.OpenAICompatibleProfile(scriptorium.OpenAICompatibleProfileConfig{
		ID:             "template-profile",
		Endpoint:       "http://template/v1",
		Model:          "template-model",
		APIKeyRequired: true,
		ExtraParams: map[string]any{
			"provider": "template",
		},
	})

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	}, scriptorium.WithProfiles(prof), scriptorium.WithLLMClient(fake))
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	_, err = engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "template-profile",
		APIKey:    "template-key",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected run to succeed, got %v", err)
	}
	if len(fake.requests) != 1 {
		t.Fatalf("expected one request, got %d", len(fake.requests))
	}
	if fake.requests[0].Target.Model != "template-model" || fake.requests[0].APIKey != "template-key" {
		t.Fatalf("unexpected generated request: %+v", fake.requests[0])
	}
	if !reflect.DeepEqual(fake.requests[0].Target.ExtraParams, map[string]any{"provider": "template"}) {
		t.Fatalf("unexpected extra params: %#v", fake.requests[0].Target.ExtraParams)
	}
}

func TestInMemoryProfileAPIKeyRequiredBehavior(t *testing.T) {
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	}, scriptorium.WithProfiles(scriptorium.Profile{
		ID:             "requires-key",
		Endpoint:       "http://requires-key/v1",
		Model:          "requires-key-model",
		APIKeyRequired: true,
	}))
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	req := scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "requires-key",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	}
	_, err = engine.Prepare(context.Background(), req)
	if !errors.Is(err, scriptorium.ErrInvalidRequest) {
		t.Fatalf("expected ErrInvalidRequest without API key, got %v", err)
	}
	req.APIKey = "direct-required-key"
	if _, err := engine.Prepare(context.Background(), req); err != nil {
		t.Fatalf("expected direct API key to satisfy APIKeyRequired, got %v", err)
	}
}

func TestInMemoryProfileWithoutAPIKeyRequiredWorksWithoutKey(t *testing.T) {
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	}, scriptorium.WithProfiles(scriptorium.Profile{
		ID:       "no-key-required",
		Endpoint: "http://no-key/v1",
		Model:    "no-key-model",
	}))
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	_, err = engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "no-key-required",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected prepare without API key to succeed, got %v", err)
	}
}

func TestInMemoryProfileExtraParamsAreCopiedAcrossPublicBoundary(t *testing.T) {
	fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}}
	labels := map[string]string{"route": "primary"}
	ids := []int{1, 2, 3}
	extraParams := map[string]any{
		"labels": labels,
		"ids":    ids,
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	},
		scriptorium.WithProfiles(scriptorium.Profile{
			ID:          "copy-profile",
			Endpoint:    "http://copy/v1",
			Model:       "copy-model",
			ExtraParams: extraParams,
		}),
		scriptorium.WithLLMClient(fake),
	)
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}
	labels["route"] = "mutated-before-run"
	ids[0] = 99
	extraParams["added"] = "mutated"

	_, err = engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "copy-profile",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected run to succeed, got %v", err)
	}
	want := map[string]any{
		"labels": map[string]string{"route": "primary"},
		"ids":    []int{1, 2, 3},
	}
	if !reflect.DeepEqual(fake.requests[0].Target.ExtraParams, want) {
		t.Fatalf("captured extra params changed after mutation:\ngot=%#v\nwant=%#v", fake.requests[0].Target.ExtraParams, want)
	}
}

func TestWithProfilesRejectsInvalidExtraParams(t *testing.T) {
	tests := []struct {
		name        string
		extraParams map[string]any
	}{
		{name: "function", extraParams: map[string]any{"bad": func() {}}},
		{name: "channel", extraParams: map[string]any{"bad": make(chan struct{})}},
		{name: "struct", extraParams: map[string]any{"bad": struct{ Name string }{Name: "bad"}}},
		{name: "non string map key", extraParams: map[string]any{"bad": map[int]string{1: "one"}}},
		{name: "nan", extraParams: map[string]any{"bad": math.NaN()}},
		{name: "positive infinity", extraParams: map[string]any{"bad": math.Inf(1)}},
		{name: "negative infinity", extraParams: map[string]any{"bad": math.Inf(-1)}},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			_, err := scriptorium.NewEngine(scriptorium.Config{PromptDir: "./examples/prompts"},
				scriptorium.WithProfiles(scriptorium.Profile{
					ID:          "invalid-extra-params",
					Endpoint:    "http://invalid/v1",
					Model:       "invalid-model",
					ExtraParams: tc.extraParams,
				}),
			)
			if !errors.Is(err, scriptorium.ErrInvalidConfig) {
				t.Fatalf("expected ErrInvalidConfig, got %v", err)
			}
		})
	}
}

func TestWithProfilesRejectsCyclicExtraParams(t *testing.T) {
	cyclicMap := map[string]any{}
	cyclicMap["self"] = cyclicMap
	cyclicSlice := []any{nil}
	cyclicSlice[0] = cyclicSlice

	tests := []struct {
		name        string
		extraParams map[string]any
	}{
		{name: "map", extraParams: cyclicMap},
		{name: "slice", extraParams: map[string]any{"cycle": cyclicSlice}},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			_, err := scriptorium.NewEngine(scriptorium.Config{PromptDir: "./examples/prompts"},
				scriptorium.WithProfiles(scriptorium.Profile{
					ID:          "cyclic-extra-params",
					Endpoint:    "http://cyclic/v1",
					Model:       "cyclic-model",
					ExtraParams: tc.extraParams,
				}),
			)
			if !errors.Is(err, scriptorium.ErrInvalidConfig) {
				t.Fatalf("expected ErrInvalidConfig, got %v", err)
			}
		})
	}
}

func TestRunStructuredOutputWorksWithSchemaFS(t *testing.T) {
	fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: `{"events":[]}`}}
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir:  t.TempDir(),
		ProfileDir: "./examples/profiles",
		SchemaDir:  t.TempDir(),
	},
		scriptorium.WithPromptFS(publicStructuredPromptFS("schema.fs.prompt", "events.schema.json"), "prompts"),
		scriptorium.WithSchemaFS(publicSchemaFS(), "schemas"),
		scriptorium.WithLLMClient(fake),
	)
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	result, err := engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID: "schema.fs.prompt",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
		},
	})
	if err != nil {
		t.Fatalf("expected run to succeed, got %v", err)
	}
	if result.Validation.Status != scriptorium.ValidationPassed || !result.Validation.IsValid {
		t.Fatalf("expected schema validation to pass, got %+v", result.Validation)
	}
	if len(fake.requests) != 1 || fake.requests[0].StructuredOutput == nil {
		t.Fatalf("expected structured output request, got %+v", fake.requests)
	}
}

func TestRunStructuredOutputWorksWithSchemaFile(t *testing.T) {
	schemaDir := t.TempDir()
	schemaPath := filepath.Join(schemaDir, "events.schema.json")
	if err := os.WriteFile(schemaPath, []byte(publicSchemaJSON()), 0o644); err != nil {
		t.Fatal(err)
	}

	fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: `{"events":[]}`}}
	engine, err := scriptorium.NewEngine(scriptorium.Config{
		ProfileDir: "./examples/profiles",
	},
		scriptorium.WithPromptFS(publicStructuredPromptFS("schema.file.prompt", "events.schema.json"), "prompts"),
		scriptorium.WithSchemaFile(schemaPath),
		scriptorium.WithLLMClient(fake),
	)
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}

	result, err := engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID: "schema.file.prompt",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
		},
	})
	if err != nil {
		t.Fatalf("expected run to succeed, got %v", err)
	}
	if result.Validation.Status != scriptorium.ValidationPassed || !result.Validation.IsValid {
		t.Fatalf("expected schema validation to pass, got %+v", result.Validation)
	}
}

func TestSourceOptionsRejectInvalidInputs(t *testing.T) {
	missingFile := filepath.Join(t.TempDir(), "missing.yaml")
	directoryPath := t.TempDir()

	tests := []struct {
		name string
		opt  scriptorium.Option
	}{
		{name: "prompt fs nil", opt: scriptorium.WithPromptFS(nil, "prompts")},
		{name: "prompt fs empty root", opt: scriptorium.WithPromptFS(fstest.MapFS{}, "")},
		{name: "prompt file empty", opt: scriptorium.WithPromptFile("")},
		{name: "prompt file missing", opt: scriptorium.WithPromptFile(missingFile)},
		{name: "prompt file directory", opt: scriptorium.WithPromptFile(directoryPath)},
		{name: "profile fs nil", opt: scriptorium.WithProfileFS(nil, "profiles")},
		{name: "profile fs empty root", opt: scriptorium.WithProfileFS(fstest.MapFS{}, "")},
		{name: "profile file empty", opt: scriptorium.WithProfileFile("")},
		{name: "schema fs nil", opt: scriptorium.WithSchemaFS(nil, "schemas")},
		{name: "schema fs empty root", opt: scriptorium.WithSchemaFS(fstest.MapFS{}, "")},
		{name: "schema file empty", opt: scriptorium.WithSchemaFile("")},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			_, err := scriptorium.NewEngine(scriptorium.Config{PromptDir: "./examples/prompts"}, tc.opt)
			if !errors.Is(err, scriptorium.ErrInvalidConfig) {
				t.Fatalf("expected ErrInvalidConfig, got %v", err)
			}
		})
	}
}

func TestPackageOptionsComposeFromSlice(t *testing.T) {
	fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}}
	options := []scriptorium.Option{
		nil,
		scriptorium.WithProfiles(scriptorium.Profile{
			ID:       "slice-profile",
			Endpoint: "http://slice/v1",
			Model:    "slice-model",
		}),
		scriptorium.WithLLMClient(fake),
	}

	engine, err := scriptorium.NewEngine(scriptorium.Config{
		PromptDir: "./examples/prompts",
		SchemaDir: "./examples/schemas",
	}, options...)
	if err != nil {
		t.Fatalf("expected package-provided options to compose, got %v", err)
	}

	_, err = engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID:  "generic.markdown_summary",
		ProfileID: "slice-profile",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
	})
	if err != nil {
		t.Fatalf("expected run with composed options to succeed, got %v", err)
	}
	if len(fake.requests) != 1 {
		t.Fatalf("expected one generate request, got %d", len(fake.requests))
	}
	if fake.requests[0].Target.Model != "slice-model" {
		t.Fatalf("expected profile from composed options, got %q", fake.requests[0].Target.Model)
	}
}

func TestExtraParamsTypedNestedValuesAreCopiedAcrossPublicBoundary(t *testing.T) {
	fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}}
	engine := newExampleEngineWithOptions(t, "./examples/schemas", scriptorium.WithLLMClient(fake))

	labels := map[string]string{"route": "primary"}
	counts := map[string]int{"retry_budget": 2}
	weights := []float64{0.25, 0.75}
	ids := []int{1, 2, 3}
	nested := map[string]any{
		"labels":  labels,
		"counts":  counts,
		"weights": weights,
		"ids":     ids,
	}
	extraParams := map[string]any{
		"labels": labels,
		"counts": counts,
		"nested": nested,
	}

	_, err := engine.Run(context.Background(), scriptorium.RunRequest{
		PromptID: "generic.markdown_summary",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.Inline("Rin opens the gate."),
			"glossary":   scriptorium.Inline("gate: A guarded passage."),
		},
		Execution: &scriptorium.ExecutionTargetOverride{ExtraParams: extraParams},
	})
	if err != nil {
		t.Fatalf("expected run to succeed, got %v", err)
	}
	if len(fake.requests) != 1 {
		t.Fatalf("expected one generate request, got %d", len(fake.requests))
	}

	captured := fake.requests[0].Target.ExtraParams
	labels["route"] = "mutated"
	counts["retry_budget"] = 99
	weights[0] = 9.9
	ids[0] = 99
	nested["added"] = "mutated"
	extraParams["new_top_level"] = "mutated"

	want := map[string]any{
		"labels": map[string]string{"route": "primary"},
		"counts": map[string]int{"retry_budget": 2},
		"nested": map[string]any{
			"labels":  map[string]string{"route": "primary"},
			"counts":  map[string]int{"retry_budget": 2},
			"weights": []float64{0.25, 0.75},
			"ids":     []int{1, 2, 3},
		},
	}
	if !reflect.DeepEqual(captured, want) {
		t.Fatalf("captured extra_params changed after mutating source:\ngot=%#v\nwant=%#v", captured, want)
	}
}

func TestRunRejectsInvalidExtraParams(t *testing.T) {
	tests := []struct {
		name        string
		extraParams map[string]any
	}{
		{name: "function", extraParams: map[string]any{"bad": func() {}}},
		{name: "channel", extraParams: map[string]any{"bad": make(chan struct{})}},
		{name: "struct", extraParams: map[string]any{"bad": struct{ Name string }{Name: "bad"}}},
		{name: "non string map key", extraParams: map[string]any{"bad": map[int]string{1: "one"}}},
		{name: "nan", extraParams: map[string]any{"bad": math.NaN()}},
		{name: "positive infinity", extraParams: map[string]any{"bad": math.Inf(1)}},
		{name: "negative infinity", extraParams: map[string]any{"bad": math.Inf(-1)}},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}}
			engine := newExampleEngineWithOptions(t, "./examples/schemas", scriptorium.WithLLMClient(fake))

			_, err := engine.Run(context.Background(), scriptorium.RunRequest{
				PromptID: "generic.markdown_summary",
				Inputs: map[string]scriptorium.ArtifactRef{
					"transcript": scriptorium.Inline("Rin opens the gate."),
					"glossary":   scriptorium.Inline("gate: A guarded passage."),
				},
				Execution: &scriptorium.ExecutionTargetOverride{ExtraParams: tc.extraParams},
			})
			if !errors.Is(err, scriptorium.ErrInvalidRequest) {
				t.Fatalf("expected ErrInvalidRequest, got %v", err)
			}
			if len(fake.requests) != 0 {
				t.Fatalf("expected invalid request to fail before LLM call, got %d requests", len(fake.requests))
			}
		})
	}
}

func TestRunRejectsCyclicExtraParams(t *testing.T) {
	cyclicMap := map[string]any{}
	cyclicMap["self"] = cyclicMap
	cyclicSlice := []any{nil}
	cyclicSlice[0] = cyclicSlice

	tests := []struct {
		name        string
		extraParams map[string]any
	}{
		{name: "map", extraParams: cyclicMap},
		{name: "slice", extraParams: map[string]any{"cycle": cyclicSlice}},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			fake := &fakeLLMClient{response: &scriptorium.GenerateResponse{Content: "ok"}}
			engine := newExampleEngineWithOptions(t, "./examples/schemas", scriptorium.WithLLMClient(fake))

			_, err := engine.Run(context.Background(), scriptorium.RunRequest{
				PromptID: "generic.markdown_summary",
				Inputs: map[string]scriptorium.ArtifactRef{
					"transcript": scriptorium.Inline("Rin opens the gate."),
					"glossary":   scriptorium.Inline("gate: A guarded passage."),
				},
				Execution: &scriptorium.ExecutionTargetOverride{ExtraParams: tc.extraParams},
			})
			if !errors.Is(err, scriptorium.ErrInvalidRequest) {
				t.Fatalf("expected ErrInvalidRequest, got %v", err)
			}
			if len(fake.requests) != 0 {
				t.Fatalf("expected invalid request to fail before LLM call, got %d requests", len(fake.requests))
			}
		})
	}
}

func TestWithLLMClientRejectsNilClient(t *testing.T) {
	_, err := scriptorium.NewEngine(exampleConfig("./examples/schemas"), scriptorium.WithLLMClient(nil))
	if !errors.Is(err, scriptorium.ErrInvalidConfig) {
		t.Fatalf("expected ErrInvalidConfig, got %v", err)
	}
}

func TestNewEngineConstructsDefaultLLMClientWithoutCredentials(t *testing.T) {
	if _, err := scriptorium.NewEngine(exampleConfig("./examples/schemas")); err != nil {
		t.Fatalf("expected default engine construction without credentials to succeed, got %v", err)
	}
}

func newExampleEngine(t *testing.T) *scriptorium.Engine {
	t.Helper()

	for _, path := range []string{
		"./examples/prompts",
		"./examples/profiles",
		"./examples/schemas",
	} {
		if _, err := os.Stat(path); err != nil {
			t.Fatalf("expected example path %s to exist: %v", path, err)
		}
	}

	engine, err := scriptorium.NewEngine(exampleConfig("./examples/schemas"))
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}
	return engine
}

func newExampleEngineWithOptions(t *testing.T, schemaDir string, opts ...scriptorium.Option) *scriptorium.Engine {
	t.Helper()

	engine, err := scriptorium.NewEngine(exampleConfig(schemaDir), opts...)
	if err != nil {
		t.Fatalf("expected engine construction to succeed, got %v", err)
	}
	return engine
}

func exampleConfig(schemaDir string) scriptorium.Config {
	return scriptorium.Config{
		PromptDir:  "./examples/prompts",
		ProfileDir: "./examples/profiles",
		SchemaDir:  schemaDir,
	}
}

func writePublicPromptFile(t *testing.T, dir, id, defaultProfile string) {
	t.Helper()
	data := `id: ` + id + `
version: "1.0.0"
default_profile: ` + defaultProfile + `
inputs:
  - name: transcript
    required: true
messages:
  - role: user
    content: "Summarize: {{input \"transcript\"}}"
output:
  format: text
  validation_mode: none
  repair_attempts: 0
`
	if err := os.WriteFile(filepath.Join(dir, id+".yaml"), []byte(data), 0o644); err != nil {
		t.Fatalf("failed to write prompt fixture: %v", err)
	}
}

func writePublicProfileFile(t *testing.T, dir, id, endpoint, model string) {
	t.Helper()
	data := `id: ` + id + `
endpoint: ` + endpoint + `
model: ` + model + `
`
	if err := os.WriteFile(filepath.Join(dir, id+".yaml"), []byte(data), 0o644); err != nil {
		t.Fatalf("failed to write profile fixture: %v", err)
	}
}

func writePublicProfileFileWithAPIKeyEnv(t *testing.T, dir, id, endpoint, model, apiKeyEnv string) {
	t.Helper()
	data := `id: ` + id + `
endpoint: ` + endpoint + `
model: ` + model + `
api_key_env: ` + apiKeyEnv + `
`
	if err := os.WriteFile(filepath.Join(dir, id+".yaml"), []byte(data), 0o644); err != nil {
		t.Fatalf("failed to write profile fixture: %v", err)
	}
}

func publicStructuredPromptFS(id string, schemaPath string) fstest.MapFS {
	return fstest.MapFS{
		"prompts/prompt.yaml": &fstest.MapFile{Data: []byte(`id: ` + id + `
version: "1.0.0"
default_profile: local-fast
inputs:
  - name: transcript
    required: true
messages:
  - role: user
    content: "Extract events from {{input \"transcript\"}}."
output:
  format: json
  validation_mode: json_schema
  schema_path: ` + schemaPath + `
  repair_attempts: 0
`)},
	}
}

func publicSchemaFS() fstest.MapFS {
	return fstest.MapFS{
		"schemas/events.schema.json": &fstest.MapFile{Data: []byte(publicSchemaJSON())},
	}
}

func publicSchemaJSON() string {
	return `{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["events"],
  "properties": {
    "events": {"type": "array"}
  }
}`
}

type fakeLLMClient struct {
	response *scriptorium.GenerateResponse
	err      error
	requests []scriptorium.GenerateRequest
}

func (f *fakeLLMClient) Generate(_ context.Context, req scriptorium.GenerateRequest) (*scriptorium.GenerateResponse, error) {
	f.requests = append(f.requests, req)
	if f.err != nil {
		return nil, f.err
	}
	return f.response, nil
}