package scenes

import (
	"context"
	"encoding/json"
	"slices"
	"strings"
	"testing"
	"time"

	"gitea.maximumdirect.net/eric/notarius/internal/framework/llm"
	"gitea.maximumdirect.net/eric/promptkit"
)

func TestPromptAssetsPrepareTranscriptWithInstructionOrdering(t *testing.T) {
	if !slices.Contains(promptAssetManifest.SharedFiles, "common-dnd-transcript-full.md") {
		t.Fatalf("shared prompt assets = %#v, want complete-session transcript scope", promptAssetManifest.SharedFiles)
	}
	transcript := []byte(`{"sentinel":"scene-transcript"}`)
	prepared := prepareScenesPrompt(t, transcript, "scene-players", "scene-party", "scene-glossary")

	if prepared.PromptID != PromptID {
		t.Fatalf("prompt id = %q, want %q", prepared.PromptID, PromptID)
	}
	if prepared.OutputContract.SchemaPath != "dnd_scenes_llm.v1.json" {
		t.Fatalf("scene output schema path = %q, want private LLM schema", prepared.OutputContract.SchemaPath)
	}
	if prepared.Messages[0].Role != "system" || prepared.Messages[1].Role != "user" {
		t.Fatalf("initial prompt roles = %#v, want system followed by campaign references", prepared.Messages[:2])
	}
	if cache := prepared.Messages[1].CacheControl; cache == nil || cache.Type != promptkit.CacheControlEphemeral {
		t.Fatalf("campaign-reference cache control = %#v, want ephemeral", cache)
	}
	if cache := prepared.Messages[0].CacheControl; cache != nil {
		t.Fatalf("system cache control = %#v, want nil", cache)
	}
	if references := prepared.Messages[1].Content; !strings.Contains(references, "scene-players") || !strings.Contains(references, "scene-party") || !strings.Contains(references, "scene-glossary") {
		t.Fatalf("reference message = %q, want supplied reference inputs", references)
	}
	transcriptIndex := -1
	for index, message := range prepared.Messages {
		if strings.Contains(message.Content, "scene-transcript") {
			transcriptIndex = index
		}
	}
	if transcriptIndex != len(prepared.Messages)-1 {
		t.Fatalf("transcript message index = %d, want final message in %#v", transcriptIndex, prepared.Messages)
	}
	if cache := prepared.Messages[transcriptIndex].CacheControl; cache == nil || cache.Type != promptkit.CacheControlEphemeral {
		t.Fatalf("transcript cache control = %#v, want ephemeral", cache)
	}
	instructionsIndex := transcriptIndex - 1
	if instructionsIndex <= 1 || prepared.Messages[instructionsIndex].CacheControl != nil {
		t.Fatalf("instruction message = %#v, want uncached message after references and before transcript", prepared.Messages[instructionsIndex])
	}
	for index, message := range prepared.Messages {
		if index != 1 && (strings.Contains(message.Content, "scene-players") || strings.Contains(message.Content, "scene-party") || strings.Contains(message.Content, "scene-glossary")) {
			t.Errorf("message %d unexpectedly rendered reference input", index)
		}
		if index != transcriptIndex && strings.Contains(message.Content, "scene-transcript") {
			t.Errorf("message %d unexpectedly rendered transcript input", index)
		}
	}
}

func TestPromptAssetDiagnosticsOmitRawMaterials(t *testing.T) {
	transcript := []byte(`{"secret":"source text"}`)
	prepared := prepareScenesPrompt(t, transcript, "private player note", "private party note", "private glossary note")
	metadata := newChunker(t, &fakeScenesLLMClient{}).ManifestMetadata()

	payload, err := json.Marshal(map[string]any{
		"prepared": map[string]any{
			"prompt_id":              prepared.PromptID,
			"prompt_version":         prepared.PromptVersion,
			"prompt_hash":            prepared.PromptHash,
			"rendered_prompt_hash":   prepared.RenderedPromptHash,
			"selected_profile_id":    prepared.SelectedProfileID,
			"output_contract":        prepared.OutputContract,
			"input_hashes":           prepared.InputHashes,
			"effective_model_params": prepared.EffectiveModelParams,
		},
		"manifest": metadata,
	})
	if err != nil {
		t.Fatalf("marshal diagnostics: %v", err)
	}
	diagnostics := string(payload)
	for _, forbidden := range []string{
		"source text",
		"private player note",
		"private party note",
		"private glossary note",
		`"properties"`,
		"start_unit_id",
	} {
		if strings.Contains(diagnostics, forbidden) {
			t.Fatalf("diagnostics leaked %q: %s", forbidden, diagnostics)
		}
	}
	if metadata["prompt_id"] != PromptID || metadata["prompt_version"] != ResponseSchemaVersion {
		t.Fatalf("manifest prompt metadata = %#v", metadata)
	}
	if !strings.HasPrefix(metadata["prompt_sha256"].(string), "sha256:") {
		t.Fatalf("manifest prompt hash = %#v, want sha256-prefixed", metadata["prompt_sha256"])
	}
}

func prepareScenesPrompt(t *testing.T, transcript []byte, players string, party string, glossary string) *promptkit.PreparedRun {
	t.Helper()
	registry := llm.NewAssetRegistry()
	if err := RegisterPromptAssets(registry); err != nil {
		t.Fatalf("register scene prompt assets: %v", err)
	}
	engine := newScenesPromptEngine(t, registry)
	prepared, err := engine.Prepare(context.Background(), promptkit.RunRequest{
		PromptID:      PromptID,
		PromptVersion: ResponseSchemaVersion,
		ProfileID:     "scene-test-profile",
		Inputs: map[string]promptkit.ArtifactRef{
			"transcript": promptkit.InlineWithURI("file:///session.json", string(transcript)),
			"players":    promptkit.Inline(players),
			"party":      promptkit.Inline(party),
			"glossary":   promptkit.Inline(glossary),
		},
	})
	if err != nil {
		t.Fatalf("Prepare() error = %v, want nil", err)
	}
	return prepared
}

func newScenesPromptEngine(t *testing.T, registry *llm.AssetRegistry) *promptkit.Engine {
	t.Helper()
	options, err := registry.PromptKitOptions()
	if err != nil {
		t.Fatalf("PromptKitOptions() error = %v, want nil", err)
	}
	options = append(options, promptkit.WithProfiles(promptkit.OpenAICompatibleProfile(promptkit.OpenAICompatibleProfileConfig{
		ID:       "scene-test-profile",
		Endpoint: "http://127.0.0.1:1/v1",
		Model:    "scene-test-model",
	})))
	engine, err := promptkit.NewEngine(promptkit.Config{Timeout: time.Second}, options...)
	if err != nil {
		t.Fatalf("NewEngine() error = %v, want nil", err)
	}
	return engine
}
