package whisperx

import (
	"context"
	"path/filepath"

	"gitea.maximumdirect.net/eric/narratio/internal/fileops"
)

var minimalTranscriptJSON = []byte(`{"schema":"speaker_transcript.v1","segments":[]}`)

// NoopClient is a deterministic no-op WhisperX adapter.
type NoopClient struct{}

// Transcribe returns the requested output path with placeholder metadata.
func (n *NoopClient) Transcribe(ctx context.Context, req TranscribeRequest) (TranscribeResult, error) {
	if err := ctx.Err(); err != nil {
		return TranscribeResult{}, err
	}
	if err := writeMinimalJSON(req.OutputRawTranscriptPath); err != nil {
		return TranscribeResult{}, err
	}
	return TranscribeResult{
		OutputRawTranscriptPath: req.OutputRawTranscriptPath,
		Attempts:                1,
		HTTPStatus:              200,
		Metadata: map[string]any{
			"placeholder": true,
		},
	}, nil
}

// FakeClient captures requests and returns deterministic responses for tests.
type FakeClient struct {
	Requests     []TranscribeRequest
	Err          error
	Result       TranscribeResult
	TranscribeFn func(ctx context.Context, req TranscribeRequest) (TranscribeResult, error)
}

// Transcribe records the request and returns either configured error or result.
func (f *FakeClient) Transcribe(ctx context.Context, req TranscribeRequest) (TranscribeResult, error) {
	if err := ctx.Err(); err != nil {
		return TranscribeResult{}, err
	}
	f.Requests = append(f.Requests, req)
	if f.TranscribeFn != nil {
		return f.TranscribeFn(ctx, req)
	}
	if f.Err != nil {
		return TranscribeResult{}, f.Err
	}
	res := f.Result
	if res.OutputRawTranscriptPath == "" {
		res.OutputRawTranscriptPath = req.OutputRawTranscriptPath
	}
	if res.Attempts == 0 {
		res.Attempts = 1
	}
	if res.Metadata == nil {
		res.Metadata = map[string]any{"fake": true}
	}
	if err := writeMinimalJSON(res.OutputRawTranscriptPath); err != nil {
		return TranscribeResult{}, err
	}
	return res, nil
}

func writeMinimalJSON(path string) error {
	if path == "" {
		return nil
	}
	if err := fileops.EnsureWorkspaceDirectory(filepath.Dir(path)); err != nil {
		return err
	}
	return fileops.WriteFileAtomic(path, minimalTranscriptJSON, fileops.WorkspaceFileMode)
}