// Copyright 2019 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 (
	"context"
	"fmt"
	"os/exec"
	"strings"
)

type ensureFile struct {
	pkg *packageDef
}

func (ef *ensureFile) String() string {
	return fmt.Sprintf("%s %s", ef.pkg.Name, ef.pkg.Version)
}

// EnsureArgs is a representation of arguments to a cipd ensure call.
type ensureArgs struct {
	installDir string
}

// Return a string slice representation of ensure args.
func (ea *ensureArgs) ToArgs() []string {
	return []string{"ensure", "-root", ea.installDir, "-ensure-file", "-"}
}

// Ensure recipe bundle from CIPD at a specified dir for a specified version.
func ensure(ctx context.Context, pkg *packageDef, installDir string) error {
	ef := ensureFile{pkg: pkg}
	ea := ensureArgs{installDir: installDir}
	cmd := exec.CommandContext(ctx, "cipd", ea.ToArgs()...)
	cmd.Stdin = strings.NewReader(ef.String())
	return cmd.Run()
}