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", "merged.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")
	}
}