package audita

import (
	"context"
	"fmt"

	"gitea.maximumdirect.net/eric/narratio/internal/adapters/subprocess"
)

// NoopRunner is a deterministic no-op audita adapter.
type NoopRunner struct{}

// Run returns requested output path with placeholder metadata.
func (n *NoopRunner) Run(ctx context.Context, req PolishRequest) (PolishResult, error) {
	if err := ctx.Err(); err != nil {
		return PolishResult{}, err
	}
	if err := materializePlaceholders(req); err != nil {
		return PolishResult{}, err
	}
	return PolishResult{ProcessedTranscriptPath: req.OutputProcessedPath, Metadata: map[string]any{"placeholder": true}}, nil
}

// FakeRunner captures polish requests and returns deterministic responses.
type FakeRunner struct {
	Requests []PolishRequest
	Err      error
	Result   PolishResult
}

// Run records request and returns configured response.
func (f *FakeRunner) Run(ctx context.Context, req PolishRequest) (PolishResult, error) {
	if err := ctx.Err(); err != nil {
		return PolishResult{}, err
	}
	f.Requests = append(f.Requests, req)
	if f.Err != nil {
		return PolishResult{}, f.Err
	}
	if err := materializePlaceholders(req); err != nil {
		return PolishResult{}, err
	}
	res := f.Result
	if res.ProcessedTranscriptPath == "" {
		res.ProcessedTranscriptPath = req.OutputProcessedPath
	}
	if res.Metadata == nil {
		res.Metadata = map[string]any{"fake": true}
	}
	return res, nil
}

func materializePlaceholders(req PolishRequest) error {
	if req.GeneratedConfigPath != "" {
		payload := map[string]any{
			"schema":                 "audita.generated.v1",
			"placeholder":            true,
			"merged_transcript_path": req.MergedTranscriptPath,
			"output_path":            req.OutputProcessedPath,
		}
		if err := subprocess.WriteYAMLAtomic(req.GeneratedConfigPath, payload, 0o644); err != nil {
			return fmt.Errorf("write generated config %q: %w", req.GeneratedConfigPath, err)
		}
	}
	if req.StdoutLogPath != "" {
		if err := subprocess.WriteFileAtomic(req.StdoutLogPath, []byte("audita noop/fake stdout placeholder\n"), 0o644); err != nil {
			return fmt.Errorf("write stdout log %q: %w", req.StdoutLogPath, err)
		}
	}
	if req.StderrLogPath != "" {
		if err := subprocess.WriteFileAtomic(req.StderrLogPath, []byte("audita noop/fake stderr placeholder\n"), 0o644); err != nil {
			return fmt.Errorf("write stderr log %q: %w", req.StderrLogPath, err)
		}
	}
	return nil
}