package seriatim

import (
	"context"
	"errors"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestFakeRunnerCapturesRequestAndReturnsPath(t *testing.T) {
	fake := &FakeRunner{}
	dir := t.TempDir()
	req := MergeRequest{
		GeneratedConfigPath:        filepath.Join(dir, "config", "seriatim.yml"),
		OutputMergedTranscriptPath: filepath.Join(dir, "transcripts", "base.json"),
		StdoutLogPath:              filepath.Join(dir, "logs", "seriatim.stdout.log"),
		StderrLogPath:              filepath.Join(dir, "logs", "seriatim.stderr.log"),
	}

	res, err := fake.Run(context.Background(), req)
	if err != nil {
		t.Fatalf("Run() error = %v", err)
	}
	if len(fake.Requests) != 1 || fake.Requests[0].GeneratedConfigPath == "" {
		t.Fatalf("requests = %#v, want captured request", fake.Requests)
	}
	if res.MergedTranscriptPath != req.OutputMergedTranscriptPath {
		t.Fatalf("merged path = %q, want %q", res.MergedTranscriptPath, req.OutputMergedTranscriptPath)
	}

	cfgData, err := os.ReadFile(req.GeneratedConfigPath)
	if err != nil {
		t.Fatalf("read generated config: %v", err)
	}
	if !strings.Contains(string(cfgData), "placeholder: true") {
		t.Fatalf("generated config = %q, want placeholder marker", string(cfgData))
	}
	for _, logPath := range []string{req.StdoutLogPath, req.StderrLogPath} {
		if _, err := os.Stat(logPath); err != nil {
			t.Fatalf("expected log file %q to exist: %v", logPath, err)
		}
	}
}

func TestFakeRunnerError(t *testing.T) {
	fake := &FakeRunner{Err: errors.New("boom")}
	_, err := fake.Run(context.Background(), MergeRequest{})
	if err == nil {
		t.Fatal("expected error, got nil")
	}
}

func TestFakeRunnerTrimCapturesRequestAndReturnsPath(t *testing.T) {
	fake := &FakeRunner{}
	dir := t.TempDir()
	req := TrimRequest{
		GeneratedConfigPath: filepath.Join(dir, "config", "seriatim.trim.yml"),
		InputTranscriptPath: filepath.Join(dir, "transcripts", "polished.json"),
		OutputTrimmedPath:   filepath.Join(dir, "transcripts", "final.trimmed.json"),
		KeepSelector:        "1-10",
		StdoutLogPath:       filepath.Join(dir, "logs", "seriatim.trim.stdout.log"),
		StderrLogPath:       filepath.Join(dir, "logs", "seriatim.trim.stderr.log"),
	}

	res, err := fake.Trim(context.Background(), req)
	if err != nil {
		t.Fatalf("Trim() error = %v", err)
	}
	if len(fake.TrimRequests) != 1 || fake.TrimRequests[0].GeneratedConfigPath == "" {
		t.Fatalf("trim requests = %#v, want captured request", fake.TrimRequests)
	}
	if res.OutputTrimmedPath != req.OutputTrimmedPath {
		t.Fatalf("trimmed path = %q, want %q", res.OutputTrimmedPath, req.OutputTrimmedPath)
	}
	if res.KeepSelector != req.KeepSelector {
		t.Fatalf("keep selector = %q, want %q", res.KeepSelector, req.KeepSelector)
	}

	cfgData, err := os.ReadFile(req.GeneratedConfigPath)
	if err != nil {
		t.Fatalf("read generated config: %v", err)
	}
	if !strings.Contains(string(cfgData), "command: trim") {
		t.Fatalf("generated config = %q, want trim command marker", string(cfgData))
	}
	for _, logPath := range []string{req.StdoutLogPath, req.StderrLogPath} {
		if _, err := os.Stat(logPath); err != nil {
			t.Fatalf("expected log file %q to exist: %v", logPath, err)
		}
	}
}

func TestFakeRunnerTrimError(t *testing.T) {
	fake := &FakeRunner{TrimErr: errors.New("boom")}
	_, err := fake.Trim(context.Background(), TrimRequest{})
	if err == nil {
		t.Fatal("expected error, got nil")
	}
}

func TestFakeRunnerNormalizeCapturesRequestAndReturnsPath(t *testing.T) {
	fake := &FakeRunner{}
	dir := t.TempDir()
	req := NormalizeRequest{
		GeneratedConfigPath:  filepath.Join(dir, "config", "seriatim.normalize.yml"),
		InputTranscriptPath:  filepath.Join(dir, "transcripts", "polished.json"),
		OutputNormalizedPath: filepath.Join(dir, "transcripts", "final.json"),
		OutputSchema:         "seriatim-intermediate",
		ReportPath:           filepath.Join(dir, "artifacts", "seriatim.normalize.report.json"),
		StdoutLogPath:        filepath.Join(dir, "logs", "seriatim.normalize.stdout.log"),
		StderrLogPath:        filepath.Join(dir, "logs", "seriatim.normalize.stderr.log"),
	}

	res, err := fake.Normalize(context.Background(), req)
	if err != nil {
		t.Fatalf("Normalize() error = %v", err)
	}
	if len(fake.NormalizeRequests) != 1 || fake.NormalizeRequests[0].GeneratedConfigPath == "" {
		t.Fatalf("normalize requests = %#v, want captured request", fake.NormalizeRequests)
	}
	if res.OutputNormalizedPath != req.OutputNormalizedPath {
		t.Fatalf("normalized path = %q, want %q", res.OutputNormalizedPath, req.OutputNormalizedPath)
	}
	if res.OutputSchema != req.OutputSchema {
		t.Fatalf("output schema = %q, want %q", res.OutputSchema, req.OutputSchema)
	}

	cfgData, err := os.ReadFile(req.GeneratedConfigPath)
	if err != nil {
		t.Fatalf("read generated config: %v", err)
	}
	if !strings.Contains(string(cfgData), "command: normalize") {
		t.Fatalf("generated config = %q, want normalize command marker", string(cfgData))
	}
	for _, path := range []string{req.StdoutLogPath, req.StderrLogPath, req.ReportPath} {
		if _, err := os.Stat(path); err != nil {
			t.Fatalf("expected file %q to exist: %v", path, err)
		}
	}
}

func TestFakeRunnerNormalizeError(t *testing.T) {
	fake := &FakeRunner{NormalizeErr: errors.New("boom")}
	_, err := fake.Normalize(context.Background(), NormalizeRequest{})
	if err == nil {
		t.Fatal("expected error, got nil")
	}
}

func TestFakeRunnerRenderCapturesRequestAndReturnsPath(t *testing.T) {
	fake := &FakeRunner{}
	dir := t.TempDir()
	req := RenderRequest{
		GeneratedConfigPath: filepath.Join(dir, "config", "seriatim.render.yml"),
		InputTranscriptPath: filepath.Join(dir, "transcripts", "final.trimmed.json"),
		OutputRenderedPath:  filepath.Join(dir, "transcripts", "final.trimmed.md"),
		Format:              "markdown",
		Title:               "Session render",
		IncludeTimestamps:   true,
		IncludeSegmentIDs:   false,
		IncludeMetadata:     true,
		StdoutLogPath:       filepath.Join(dir, "logs", "seriatim.render.stdout.log"),
		StderrLogPath:       filepath.Join(dir, "logs", "seriatim.render.stderr.log"),
	}

	res, err := fake.Render(context.Background(), req)
	if err != nil {
		t.Fatalf("Render() error = %v", err)
	}
	if len(fake.RenderRequests) != 1 || fake.RenderRequests[0].GeneratedConfigPath == "" {
		t.Fatalf("render requests = %#v, want captured request", fake.RenderRequests)
	}
	if res.OutputRenderedPath != req.OutputRenderedPath {
		t.Fatalf("rendered path = %q, want %q", res.OutputRenderedPath, req.OutputRenderedPath)
	}
	if res.Format != req.Format {
		t.Fatalf("format = %q, want %q", res.Format, req.Format)
	}
	if res.Title != req.Title {
		t.Fatalf("title = %q, want %q", res.Title, req.Title)
	}

	cfgData, err := os.ReadFile(req.GeneratedConfigPath)
	if err != nil {
		t.Fatalf("read generated config: %v", err)
	}
	if !strings.Contains(string(cfgData), "command: render") {
		t.Fatalf("generated config = %q, want render command marker", string(cfgData))
	}
	for _, path := range []string{req.StdoutLogPath, req.StderrLogPath, req.OutputRenderedPath} {
		if _, err := os.Stat(path); err != nil {
			t.Fatalf("expected file %q to exist: %v", path, err)
		}
	}
}

func TestFakeRunnerRenderError(t *testing.T) {
	fake := &FakeRunner{RenderErr: errors.New("boom")}
	_, err := fake.Render(context.Background(), RenderRequest{})
	if err == nil {
		t.Fatal("expected error, got nil")
	}
}