package llm

import (
	"context"
	"os"
	"path/filepath"
	"slices"
	"testing"

	"gitea.maximumdirect.net/eric/audita/v3/internal/core/config"
	"gitea.maximumdirect.net/eric/audita/v3/internal/prompts"
	ck "go.maximumdirect.net/configkit"
	pk "go.maximumdirect.net/promptkit"
)

func TestEngineCapturesAutomaticPromptSources(t *testing.T) {
	dir := t.TempDir()
	main := filepath.Join(dir, "config.yml")
	write := func(name, text string) {
		t.Helper()
		if err := os.MkdirAll(filepath.Dir(filepath.Join(dir, name)), 0755); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(filepath.Join(dir, name), []byte(text), 0644); err != nil {
			t.Fatal(err)
		}
	}
	write("config.yml", "version: 3\n")
	write("prompts.yml", "collections:\n  audita:\n    prompts:\n      - id: modules.grammar.proposal\n        messages:\n          - role: user\n            content_file: message.txt\n        output:\n          format: text\n          validation_mode: none\n")
	write("message.txt", "first")
	write("prompts/nested/extra.yml", "prompts:\n  - id: extra\n    messages:\n      - role: user\n        content: extra\n    output:\n      format: text\n      validation_mode: none\n")
	loaded, err := config.Load(ck.Input{Source: ck.File(main)}, "")
	if err != nil {
		t.Fatal(err)
	}
	first, err := NewRuntime(context.Background(), loaded, nil)
	if err != nil {
		t.Fatal(err)
	}
	inspect := func(r *Runtime) string {
		t.Helper()
		p, err := r.Engine.InspectPrompt(context.Background(), prompts.PromptIDModuleGrammarProposal)
		if err != nil {
			t.Fatal(err)
		}
		return p.Messages[0].Content
	}
	if got := inspect(first); got != "first" {
		t.Fatalf("prompt = %q", got)
	}
	for _, name := range []string{"prompts.yml", "message.txt", "prompts/nested/extra.yml"} {
		if !slices.Contains(first.SourcePaths, filepath.Join(dir, name)) {
			t.Errorf("missing %s in %v", name, first.SourcePaths)
		}
	}
	if _, err := first.Engine.InspectPrompt(context.Background(), prompts.PromptIDModuleGlossaryProposal); err != nil {
		t.Fatal(err)
	}
	if _, err := first.Engine.InspectPrompt(context.Background(), "extra"); err != nil {
		t.Fatal(err)
	}
	write("message.txt", "second")
	second, err := NewRuntime(context.Background(), loaded, nil)
	if err != nil {
		t.Fatal(err)
	}
	if inspect(first) != "first" || inspect(second) != "second" {
		t.Fatal("engine did not capture source at construction")
	}
}

func TestEngineWithoutMainUsesEmbeddedPrompts(t *testing.T) {
	loaded, err := config.Load(ck.Input{Source: ck.NoSource()}, "")
	if err != nil {
		t.Fatal(err)
	}
	runtime, err := NewRuntime(context.Background(), loaded, nil)
	if err != nil {
		t.Fatal(err)
	}
	if len(runtime.SourcePaths) != 0 {
		t.Fatalf("unexpected paths: %v", runtime.SourcePaths)
	}
	if _, err := runtime.Engine.InspectPrompt(context.Background(), prompts.PromptIDModuleGrammarProposal); err != nil {
		t.Fatal(err)
	}
}

func TestEngineCapturesInheritedMessageAndRejectsPeerConflicts(t *testing.T) {
	dir := t.TempDir()
	write := func(name, text string) {
		t.Helper()
		file := filepath.Join(dir, name)
		if err := os.MkdirAll(filepath.Dir(file), 0755); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(file, []byte(text), 0644); err != nil {
			t.Fatal(err)
		}
	}
	write("config.yml", "version: 3\n")
	write("prompts.yml", "config:\n  imports:\n    - path: shared/catalog.yml\n      required: true\n")
	write("shared/catalog.yml", "prompts:\n  - id: parent\n    messages:\n      - role: user\n        content_file: instruction.md\n    output:\n      format: text\n      validation_mode: none\n")
	write("shared/instruction.md", "inherited content")
	write("prompts/child.yml", "prompts:\n  - id: child\n    extends: {id: parent}\n")
	loaded, err := config.Load(ck.Input{Source: ck.File(filepath.Join(dir, "config.yml"))}, "")
	if err != nil {
		t.Fatal(err)
	}
	runtime, err := NewRuntime(context.Background(), loaded, nil)
	if err != nil {
		t.Fatal(err)
	}
	prompt, err := runtime.Engine.InspectPrompt(context.Background(), "child")
	if err != nil || prompt.Messages[0].Content != "inherited content" {
		t.Fatalf("inherited prompt: %+v, %v", prompt, err)
	}
	for _, name := range []string{"prompts.yml", "shared/catalog.yml", "shared/instruction.md", "prompts/child.yml"} {
		if !slices.Contains(runtime.SourcePaths, filepath.Join(dir, name)) {
			t.Errorf("missing %s in %v", name, runtime.SourcePaths)
		}
	}
	write("prompts/duplicate.yml", "prompts:\n  - id: parent\n    messages:\n      - role: user\n        content: duplicate\n    output:\n      format: text\n      validation_mode: none\n")
	if _, err := NewRuntime(context.Background(), loaded, nil); err == nil || IsAssetError(err) {
		t.Fatalf("peer conflict classification: %v", err)
	}
}

func TestEngineUsesRecordedContextWithWiderRoot(t *testing.T) {
	root := t.TempDir()
	project := filepath.Join(root, "campaign")
	if err := os.Mkdir(project, 0755); err != nil {
		t.Fatal(err)
	}
	for name, body := range map[string]string{
		"config.yml":  "version: 3\n",
		"prompts.yml": "config:\n  imports:\n    - path: ../shared.yml\n      required: true\n",
	} {
		if err := os.WriteFile(filepath.Join(project, name), []byte(body), 0644); err != nil {
			t.Fatal(err)
		}
	}
	if err := os.WriteFile(filepath.Join(root, "shared.yml"), []byte("prompts:\n  - id: shared\n    messages:\n      - role: user\n        content: shared\n    output:\n      format: text\n      validation_mode: none\n"), 0644); err != nil {
		t.Fatal(err)
	}
	source := ck.SearchConfig("audita", ck.SearchDirectory(project))
	loaded, err := config.Load(ck.Input{Source: source, Filesystem: &ck.FilesystemContext{Root: root}}, "")
	if err != nil {
		t.Fatal(err)
	}
	t.Chdir(t.TempDir())
	runtime, err := NewRuntime(context.Background(), loaded, nil)
	if err != nil {
		t.Fatal(err)
	}
	if _, err := runtime.Engine.InspectPrompt(context.Background(), "shared"); err != nil {
		t.Fatal(err)
	}
	for _, file := range []string{filepath.Join(project, "prompts.yml"), filepath.Join(root, "shared.yml")} {
		if !slices.Contains(runtime.SourcePaths, file) {
			t.Errorf("missing %s in %v", file, runtime.SourcePaths)
		}
	}
}

func TestEngineResolvesLinkedPromptMessageBesideDefinition(t *testing.T) {
	root := t.TempDir()
	if err := os.Mkdir(filepath.Join(root, "defs"), 0755); err != nil {
		t.Fatal(err)
	}
	for name, contents := range map[string]string{
		"config.yml":         "version: 3\n",
		"defs/resources.yml": "prompts:\n  - id: linked\n    messages:\n      - role: user\n        content_file: message.txt\n    output:\n      format: text\n      validation_mode: none\n",
		"defs/message.txt":   "message beside definition",
		"message.txt":        "message beside symlink",
	} {
		if err := os.WriteFile(filepath.Join(root, name), []byte(contents), 0644); err != nil {
			t.Fatal(err)
		}
	}
	if err := os.Symlink("defs/resources.yml", filepath.Join(root, "prompts.yml")); err != nil {
		t.Fatal(err)
	}
	loaded, err := config.Load(ck.Input{Source: ck.File(filepath.Join(root, "config.yml"))}, "")
	if err != nil {
		t.Fatal(err)
	}
	runtime, err := NewRuntime(context.Background(), loaded, nil)
	if err != nil {
		t.Fatal(err)
	}
	prompt, err := runtime.Engine.InspectPrompt(context.Background(), "linked")
	if err != nil || prompt.Messages[0].Content != "message beside definition" {
		t.Fatalf("linked prompt: %+v, %v", prompt, err)
	}
	for _, name := range []string{"defs/resources.yml", "defs/message.txt"} {
		if !slices.Contains(runtime.SourcePaths, filepath.Join(root, name)) {
			t.Errorf("missing consumed source %s in %v", name, runtime.SourcePaths)
		}
	}
}

func TestRepairPromptReplacementUsesMessageFile(t *testing.T) {
	dir := t.TempDir()
	for name, content := range map[string]string{
		"config.yml":  "version: 3\n",
		"prompts.yml": "collections:\n  audita:\n    prompts:\n      - id: modules.grammar.repair\n        messages:\n          - role: user\n            content_file: repair.txt\n        output:\n          format: json\n          validation_mode: json_schema\n          schema_path: correction_repair.v1.json\nprofiles:\n  - id: fixture\n    endpoint: https://example.invalid/v1\n    model: fixture\n",
		"repair.txt":  "Replacement {{.RepairRequestJSON}}",
	} {
		if err := os.WriteFile(filepath.Join(dir, name), []byte(content), 0644); err != nil {
			t.Fatal(err)
		}
	}
	loaded, err := config.Load(ck.Input{Source: ck.File(filepath.Join(dir, "config.yml"))}, "")
	if err != nil {
		t.Fatal(err)
	}
	runtime, err := NewRuntime(context.Background(), loaded, nil)
	if err != nil {
		t.Fatal(err)
	}
	prepared, err := runtime.Engine.Prepare(context.Background(), pk.RunRequest{PromptID: prompts.PromptIDModuleGrammarRepair, ProfileID: "fixture", Vars: map[string]string{"RepairRequestJSON": "fixture request"}})
	if err != nil {
		t.Fatal(err)
	}
	if len(prepared.Messages) != 1 || prepared.Messages[0].Content != "Replacement fixture request" || prepared.OutputContract.SchemaPath != "correction_repair.v1.json" {
		t.Fatalf("prepared replacement: %+v", prepared)
	}
}