// Copyright 2016 The Fuchsia 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 (
	"fmt"
	"os"
	"path/filepath"

	"fuchsia.googlesource.com/jiri"
	"fuchsia.googlesource.com/jiri/cmdline"
)

var cmdInit = &cmdline.Command{
	Runner: cmdline.RunnerFunc(runInit),
	Name:   "init",
	Short:  "Create a new jiri root",
	Long: `
The "init" command creates new jiri "root" - basically a [root]/.jiri_root
directory and template files.

Running "init" in existing jiri [root] is safe.
`,
	ArgsName: "[directory]",
	ArgsLong: `
If you provide a directory, the command is run inside it. If this directory
does not exists, it will be created.
`,
}

var (
	cacheFlag  string
	sharedFlag bool
)

func init() {
	cmdInit.Flags.StringVar(&cacheFlag, "cache", "", "Jiri cache directory")
	cmdInit.Flags.BoolVar(&sharedFlag, "shared", false, "Use shared cache, which doesn't commit or push")
}

func runInit(env *cmdline.Env, args []string) error {
	if len(args) > 1 {
		return fmt.Errorf("wrong number of arguments")
	}

	var dir string
	var err error
	if len(args) == 1 {
		dir, err = filepath.Abs(args[0])
		if err != nil {
			return err
		}
		if _, err := os.Stat(dir); err != nil {
			if !os.IsNotExist(err) {
				return err
			}
			if err := os.Mkdir(dir, 0755); err != nil {
				return err
			}
		}
	} else {
		dir, err = os.Getwd()
		if err != nil {
			return err
		}
	}

	d := filepath.Join(dir, jiri.RootMetaDir)
	if _, err := os.Stat(d); err != nil {
		if !os.IsNotExist(err) {
			return err
		}
		if err := os.Mkdir(d, 0755); err != nil {
			return err
		}
	}

	if cacheFlag != "" {
		cache, err := filepath.Abs(cacheFlag)
		if err != nil {
			return err
		}
		if _, err := os.Stat(cache); os.IsNotExist(err) {
			if err := os.MkdirAll(cache, 0755); err != nil {
				return err
			}
		}
	}

	config := jiri.Config{
		CachePath: cacheFlag,
	}
	if cacheFlag != "" {
		config.Shared = sharedFlag
	}
	configPath := filepath.Join(d, jiri.ConfigFile)
	if err := config.Write(configPath); err != nil {
		return err
	}

	// TODO(phosek): also create an empty manifest

	return nil
}