// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"flag"
	"fmt"
	"log"
	"os"
	"strings"

	"cmd/internal/buildid"
)

func usage() {
	fmt.Fprintf(os.Stderr, "usage: go tool buildid [-w] file\n")
	flag.PrintDefaults()
	os.Exit(2)
}

var wflag = flag.Bool("w", false, "write build ID")

func main() {
	log.SetPrefix("buildid: ")
	log.SetFlags(0)
	flag.Usage = usage
	flag.Parse()
	if flag.NArg() != 1 {
		usage()
	}

	file := flag.Arg(0)
	id, err := buildid.ReadFile(file)
	if err != nil {
		log.Fatal(err)
	}
	if !*wflag {
		fmt.Printf("%s\n", id)
		return
	}

	f, err := os.Open(file)
	if err != nil {
		log.Fatal(err)
	}
	matches, hash, err := buildid.FindAndHash(f, id, 0)
	if err != nil {
		log.Fatal(err)
	}
	f.Close()

	tail := id
	if i := strings.LastIndex(id, "."); i >= 0 {
		tail = tail[i+1:]
	}
	if len(tail) != len(hash)*2 {
		log.Fatalf("%s: cannot find %d-byte hash in id %s", file, len(hash), id)
	}
	newID := id[:len(id)-len(tail)] + fmt.Sprintf("%x", hash)

	f, err = os.OpenFile(file, os.O_WRONLY, 0)
	if err != nil {
		log.Fatal(err)
	}
	if err := buildid.Rewrite(f, matches, newID); err != nil {
		log.Fatal(err)
	}
	if err := f.Close(); err != nil {
		log.Fatal(err)
	}
}