// 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"
	"path/filepath"

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

var cmdGrep = &cmdline.Command{
	Runner: jiri.RunnerFunc(runGrep),
	Name:   "grep",
	Short:  "Search across projects.",
	Long: `
Run git grep across all projects.
`,
	ArgsName: "<query>",
}

func doGrep(jirix *jiri.X, args []string) ([]string, error) {
	if len(args) != 1 {
		return nil, jirix.UsageErrorf("grep requires one argument")
	}
	projects, err := project.LocalProjects(jirix, project.FastScan)
	if err != nil {
		return nil, err
	}

	// TODO(ianloic): run in parallel rather than serially.
	// TODO(ianloic): only run grep on projects under the cwd.
	var results []string
	for _, project := range projects {
		relpath, err := filepath.Rel(jirix.Root, project.Path)
		if err != nil {
			return nil, err
		}
		git := gitutil.New(jirix, gitutil.RootDirOpt(project.Path))
		// TODO(ianloic): allow args to be passed to `git grep`.
		lines, err := git.Grep(args[0])
		if err != nil {
			continue
		}
		for _, line := range lines {
			// TODO(ianloic): higlight the project path part like `repo grep`.
			results = append(results, relpath+"/"+line)
		}
	}

	// TODO(ianloic): fail if all of the sub-greps fail
	return results, nil
}

func runGrep(jirix *jiri.X, args []string) error {
	lines, err := doGrep(jirix, args)
	if err != nil {
		return err
	}

	for _, line := range lines {
		fmt.Println(line)
	}
	return nil
}