package main

import (
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"os"
	"path/filepath"
)

// runExport writes the games_published webhook payload: every game.yaml as JSON, ready for the panel.
func runExport(args []string) error {
	fs := flag.NewFlagSet("export", flag.ExitOnError)
	gamesDir := fs.String("games", "games", "directory holding one folder per game")
	repo := fs.String("repo", "", "repository full name, e.g. gbreed-public/gbr-games")
	commit := fs.String("commit", "", "commit SHA the templates come from")
	out := fs.String("out", "", "file to write (default stdout)")
	fs.Parse(args)

	entries, err := os.ReadDir(*gamesDir)
	if err != nil {
		return err
	}
	games := []any{}
	for _, e := range entries {
		if !e.IsDir() {
			continue
		}
		raw, err := os.ReadFile(filepath.Join(*gamesDir, e.Name(), "game.yaml"))
		if err != nil {
			return fmt.Errorf("%s: %w", e.Name(), err)
		}
		game, err := loadYAML(raw)
		if err != nil {
			return fmt.Errorf("%s/game.yaml: %w", e.Name(), err)
		}
		games = append(games, game)
	}
	if len(games) == 0 {
		return errors.New("no games to export")
	}

	payload := map[string]any{
		"repository": map[string]any{"full_name": *repo},
		"after":      *commit,
		"games":      games,
	}
	b, err := json.Marshal(payload)
	if err != nil {
		return err
	}
	if *out == "" {
		_, err = os.Stdout.Write(b)
		return err
	}
	return os.WriteFile(*out, b, 0o644)
}