/*
Copyright 2016 The Kubernetes Authors All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package main

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"github.com/spf13/cobra"

	"k8s.io/helm/pkg/repo"
)

func init() {
	RootCommand.AddCommand(searchCmd)
}

var searchCmd = &cobra.Command{
	Use:     "search [keyword]",
	Short:   "search for a keyword in charts",
	Long:    "Searches the known repositories cache files for the specified search string, looks at name and keywords",
	RunE:    search,
	PreRunE: requireInit,
}

func search(cmd *cobra.Command, args []string) error {
	if len(args) == 0 {
		return errors.New("This command needs at least one argument (search string)")
	}

	results, err := searchCacheForPattern(cacheDirectory(), args[0])
	if err != nil {
		return err
	}
	if len(results) > 0 {
		for _, result := range results {
			fmt.Println(result)
		}
	}
	return nil
}

func searchChartRefsForPattern(search string, chartRefs map[string]*repo.ChartRef) []string {
	matches := []string{}
	for k, c := range chartRefs {
		if strings.Contains(c.Name, search) && !c.Removed {
			matches = append(matches, k)
			continue
		}
		if c.Chartfile == nil {
			continue
		}
		for _, keyword := range c.Chartfile.Keywords {
			if strings.Contains(keyword, search) {
				matches = append(matches, k)
			}
		}
	}
	return matches
}

func searchCacheForPattern(dir string, search string) ([]string, error) {
	fileList := []string{}
	filepath.Walk(dir, func(path string, f os.FileInfo, err error) error {
		if !f.IsDir() {
			fileList = append(fileList, path)
		}
		return nil
	})
	matches := []string{}
	for _, f := range fileList {
		index, err := repo.LoadIndexFile(f)
		if err != nil {
			return matches, fmt.Errorf("index %s corrupted: %s", f, err)
		}

		m := searchChartRefsForPattern(search, index.Entries)
		repoName := strings.TrimSuffix(filepath.Base(f), "-index.yaml")
		for _, c := range m {
			// TODO: Is it possible for this file to be missing? Or to have
			// an extension other than .tgz? Should the actual filename be in
			// the YAML?
			fname := filepath.Join(repoName, c+".tgz")
			matches = append(matches, fname)
		}
	}
	return matches, nil
}