// Command openapi writes the MusicServer API description without starting the server.
//
//	go run ./cmd/openapi -out .
//
// It writes openapi.json (OpenAPI 3.1) and openapi-3.0.json (OpenAPI 3.0, for tools
// that don't support 3.1 yet). A running server serves the same files at /openapi.json
// and /openapi-3.0.json.
package main

import (
	"flag"
	"fmt"
	"os"
	"path/filepath"

	"music-server/internal/server"
)

func main() {
	out := flag.String("out", ".", "directory to write openapi.json and openapi-3.0.json to")
	flag.Parse()

	if err := run(*out); err != nil {
		fmt.Fprintln(os.Stderr, "openapi:", err)
		os.Exit(1)
	}
}

func run(out string) error {
	spec := server.OpenAPISpec()
	v31, err := spec.MarshalJSON()
	if err != nil {
		return err
	}
	v30, err := spec.Downgrade()
	if err != nil {
		return err
	}

	if err := os.MkdirAll(out, 0o755); err != nil {
		return err
	}
	for name, data := range map[string][]byte{"openapi.json": v31, "openapi-3.0.json": v30} {
		path := filepath.Join(out, name)
		if err := os.WriteFile(path, data, 0o644); err != nil {
			return err
		}
		fmt.Println("Wrote", path)
	}
	return nil
}