package builtin

import (
	"context"
	"encoding/json"
	"os"

	"gitea.maximumdirect.net/eric/seriatim/internal/config"
	"gitea.maximumdirect.net/eric/seriatim/internal/report"
)

type jsonOutputWriter struct{}

func (jsonOutputWriter) Name() string {
	return "json"
}

func (jsonOutputWriter) Write(ctx context.Context, out any, rpt report.Report, cfg config.Config) ([]report.Event, error) {
	if err := ctx.Err(); err != nil {
		return nil, err
	}

	file, err := os.Create(cfg.OutputFile)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	enc := json.NewEncoder(file)
	enc.SetIndent("", "  ")
	if err := enc.Encode(out); err != nil {
		return nil, err
	}

	return []report.Event{
		report.Info("output", "json", "wrote transcript JSON"),
	}, nil
}