package spells

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

	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/llm"
	"gitea.maximumdirect.net/eric/notarius/internal/modules/sharedassets"
	"gitea.maximumdirect.net/eric/scriptorium"
)

func TestScriptoriumPromptPreparesTranscriptReferencesAndTaskMessages(t *testing.T) {
	transcript := []byte(`{"id":"session-1","segments":[{"id":"u1","text":"Mira casts shield."}]}`)
	prepared := prepareSpellsPrompt(t, transcript, "Mira: wizard", "Shield: abjuration")

	if prepared.PromptID != PromptID {
		t.Fatalf("prompt id = %q, want %q", prepared.PromptID, PromptID)
	}
	if got := len(prepared.Messages); got != 5 {
		t.Fatalf("message count = %d, want 5", got)
	}
	wantTranscript := "A transcript of a Dungeons & Dragons gameplay session is provided below.\n\n" + string(transcript) + "\n"
	if prepared.Messages[1].Content != wantTranscript {
		t.Fatalf("transcript message = %q, want byte-identical shared transcript body", prepared.Messages[1].Content)
	}
	if prepared.Messages[1].CacheControl == nil || prepared.Messages[2].CacheControl == nil {
		t.Fatalf("expected transcript and reference messages to be cacheable: %#v", prepared.Messages)
	}
	if !strings.Contains(prepared.Messages[2].Content, "Roster reference:\nMira: wizard") {
		t.Fatalf("reference message missing roster content: %q", prepared.Messages[2].Content)
	}
	if !strings.Contains(prepared.Messages[2].Content, "Glossary reference:\nShield: abjuration") {
		t.Fatalf("reference message missing glossary content: %q", prepared.Messages[2].Content)
	}
	if !strings.Contains(prepared.Messages[3].Content, "Extract Dungeons & Dragons spell-cast artifacts") {
		t.Fatalf("task message missing spell task text: %q", prepared.Messages[3].Content)
	}
	if strings.Contains(prepared.Messages[3].Content, string(transcript)) {
		t.Fatalf("task message leaked transcript bytes")
	}
}

func TestScriptoriumPromptPreparesWithMissingOptionalReferences(t *testing.T) {
	transcript := []byte(`{"id":"session-1","segments":[]}`)
	prepared := prepareSpellsPrompt(t, transcript, " ", " ")

	if !strings.Contains(prepared.Messages[2].Content, "Roster reference:\n ") {
		t.Fatalf("reference message did not include empty roster input: %q", prepared.Messages[2].Content)
	}
	if !strings.Contains(prepared.Messages[2].Content, "Glossary reference:\n ") {
		t.Fatalf("reference message did not include empty glossary input: %q", prepared.Messages[2].Content)
	}
}

func TestReferencePromptInputRenderingIsDeterministic(t *testing.T) {
	slot := contracts.ResolvedReferenceSlot{
		Items: []contracts.ReferenceItem{
			{
				SlotName:  "roster",
				MediaType: "text/plain",
				Content:   []byte("second"),
				Digest:    "sha256:bbb",
				Origin:    contracts.ReferenceOrigin{Type: "file", URI: "file:///b.txt"},
				SizeBytes: 6,
			},
			{
				SlotName:  "roster",
				MediaType: "text/plain",
				Content:   []byte("first"),
				Digest:    "sha256:aaa",
				Origin:    contracts.ReferenceOrigin{Type: "file", URI: "file:///a.txt"},
				SizeBytes: 5,
			},
		},
	}
	first := string(referencePromptInput(slot))
	second := string(referencePromptInput(slot))
	if first != second {
		t.Fatalf("reference rendering was not deterministic:\nfirst=%q\nsecond=%q", first, second)
	}
	if !strings.Contains(first, "Reference 1\nOrigin-Type: file\nOrigin-URI: file:///a.txt\nDigest: sha256:aaa") {
		t.Fatalf("first reference heading was not stable: %q", first)
	}
	if strings.Index(first, "first") > strings.Index(first, "second") {
		t.Fatalf("references were not sorted deterministically: %q", first)
	}
}

func TestSingleReferencePromptInputKeepsContentOnly(t *testing.T) {
	got := string(referencePromptInput(contracts.ResolvedReferenceSlot{
		Items: []contracts.ReferenceItem{{Content: []byte("single reference")}},
	}))
	if got != "single reference" {
		t.Fatalf("single reference rendering = %q, want raw content only", got)
	}
}

func TestScriptoriumPromptDiagnosticsOmitRawMaterials(t *testing.T) {
	transcript := []byte(`{"secret":"source text"}`)
	reference := "private roster note"
	prepared := prepareSpellsPrompt(t, transcript, reference, " ")
	metadata := New().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",
		reference,
		"Extract Dungeons & Dragons spell-cast artifacts",
		`"properties"`,
		"spell_casts",
	} {
		if strings.Contains(diagnostics, forbidden) {
			t.Fatalf("diagnostics leaked %q: %s", forbidden, diagnostics)
		}
	}
	if metadata["prompt_id"] != PromptID || metadata["prompt_version"] != SchemaVersion {
		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 prepareSpellsPrompt(t *testing.T, transcript []byte, roster string, glossary string) *scriptorium.PreparedRun {
	t.Helper()
	registry := llm.NewAssetRegistry()
	if err := sharedassets.Register(registry); err != nil {
		t.Fatalf("register shared prompt assets: %v", err)
	}
	if err := RegisterPromptAssets(registry); err != nil {
		t.Fatalf("register spell prompt assets: %v", err)
	}
	options, err := registry.ScriptoriumOptions()
	if err != nil {
		t.Fatalf("ScriptoriumOptions() error = %v, want nil", err)
	}
	options = append(options, scriptorium.WithProfiles(scriptorium.OpenAICompatibleProfile(scriptorium.OpenAICompatibleProfileConfig{
		ID:       "spell-test-profile",
		Endpoint: "http://127.0.0.1:1/v1",
		Model:    "spell-test-model",
	})))
	engine, err := scriptorium.NewEngine(scriptorium.Config{Timeout: time.Second}, options...)
	if err != nil {
		t.Fatalf("NewEngine() error = %v, want nil", err)
	}
	prepared, err := engine.Prepare(context.Background(), scriptorium.RunRequest{
		PromptID:      PromptID,
		PromptVersion: SchemaVersion,
		ProfileID:     "spell-test-profile",
		Inputs: map[string]scriptorium.ArtifactRef{
			"transcript": scriptorium.InlineWithURI("file:///session.json", string(transcript)),
			"roster":     scriptorium.Inline(roster),
			"glossary":   scriptorium.Inline(glossary),
		},
	})
	if err != nil {
		t.Fatalf("Prepare() error = %v, want nil", err)
	}
	return prepared
}