// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package setting

import (
	"path"
	"path/filepath"
	"strings"
	"time"

	"code.gitea.io/gitea/modules/log"

	"github.com/gobwas/glob"
)

// enumerates all the indexer queue types
const (
	LevelQueueType   = "levelqueue"
	ChannelQueueType = "channel"
	RedisQueueType   = "redis"
)

var (
	// Indexer settings
	Indexer = struct {
		IssueType             string
		IssuePath             string
		IssueConnStr          string
		IssueIndexerName      string
		IssueQueueType        string
		IssueQueueDir         string
		IssueQueueConnStr     string
		IssueQueueBatchNumber int
		StartupTimeout        time.Duration

		RepoIndexerEnabled bool
		RepoType           string
		RepoPath           string
		RepoConnStr        string
		RepoIndexerName    string
		UpdateQueueLength  int
		MaxIndexerFileSize int64
		IncludePatterns    []glob.Glob
		ExcludePatterns    []glob.Glob
		ExcludeVendored    bool
	}{
		IssueType:             "bleve",
		IssuePath:             "indexers/issues.bleve",
		IssueConnStr:          "",
		IssueIndexerName:      "gitea_issues",
		IssueQueueType:        LevelQueueType,
		IssueQueueDir:         "indexers/issues.queue",
		IssueQueueConnStr:     "",
		IssueQueueBatchNumber: 20,

		RepoIndexerEnabled: false,
		RepoType:           "bleve",
		RepoPath:           "indexers/repos.bleve",
		RepoConnStr:        "",
		RepoIndexerName:    "gitea_codes",
		MaxIndexerFileSize: 1024 * 1024,
		ExcludeVendored:    true,
	}
)

func newIndexerService() {
	sec := Cfg.Section("indexer")
	Indexer.IssueType = sec.Key("ISSUE_INDEXER_TYPE").MustString("bleve")
	Indexer.IssuePath = sec.Key("ISSUE_INDEXER_PATH").MustString(path.Join(AppDataPath, "indexers/issues.bleve"))
	if !filepath.IsAbs(Indexer.IssuePath) {
		Indexer.IssuePath = path.Join(AppWorkPath, Indexer.IssuePath)
	}
	Indexer.IssueConnStr = sec.Key("ISSUE_INDEXER_CONN_STR").MustString(Indexer.IssueConnStr)
	Indexer.IssueIndexerName = sec.Key("ISSUE_INDEXER_NAME").MustString(Indexer.IssueIndexerName)

	Indexer.IssueQueueType = sec.Key("ISSUE_INDEXER_QUEUE_TYPE").MustString(LevelQueueType)
	Indexer.IssueQueueDir = sec.Key("ISSUE_INDEXER_QUEUE_DIR").MustString(path.Join(AppDataPath, "indexers/issues.queue"))
	Indexer.IssueQueueConnStr = sec.Key("ISSUE_INDEXER_QUEUE_CONN_STR").MustString("")
	Indexer.IssueQueueBatchNumber = sec.Key("ISSUE_INDEXER_QUEUE_BATCH_NUMBER").MustInt(20)

	Indexer.RepoIndexerEnabled = sec.Key("REPO_INDEXER_ENABLED").MustBool(false)
	Indexer.RepoType = sec.Key("REPO_INDEXER_TYPE").MustString("bleve")
	Indexer.RepoPath = sec.Key("REPO_INDEXER_PATH").MustString(path.Join(AppDataPath, "indexers/repos.bleve"))
	if !filepath.IsAbs(Indexer.RepoPath) {
		Indexer.RepoPath = path.Join(AppWorkPath, Indexer.RepoPath)
	}
	Indexer.RepoConnStr = sec.Key("REPO_INDEXER_CONN_STR").MustString("")
	Indexer.RepoIndexerName = sec.Key("REPO_INDEXER_NAME").MustString("gitea_codes")

	Indexer.IncludePatterns = IndexerGlobFromString(sec.Key("REPO_INDEXER_INCLUDE").MustString(""))
	Indexer.ExcludePatterns = IndexerGlobFromString(sec.Key("REPO_INDEXER_EXCLUDE").MustString(""))
	Indexer.ExcludeVendored = sec.Key("REPO_INDEXER_EXCLUDE_VENDORED").MustBool(true)
	Indexer.UpdateQueueLength = sec.Key("UPDATE_BUFFER_LEN").MustInt(20)
	Indexer.MaxIndexerFileSize = sec.Key("MAX_FILE_SIZE").MustInt64(1024 * 1024)
	Indexer.StartupTimeout = sec.Key("STARTUP_TIMEOUT").MustDuration(30 * time.Second)
}

// IndexerGlobFromString parses a comma separated list of patterns and returns a glob.Glob slice suited for repo indexing
func IndexerGlobFromString(globstr string) []glob.Glob {
	extarr := make([]glob.Glob, 0, 10)
	for _, expr := range strings.Split(strings.ToLower(globstr), ",") {
		expr = strings.TrimSpace(expr)
		if expr != "" {
			if g, err := glob.Compile(expr, '.', '/'); err != nil {
				log.Info("Invalid glob expresion '%s' (skipped): %v", expr, err)
			} else {
				extarr = append(extarr, g)
			}
		}
	}
	return extarr
}