package store

import (
	"fmt"
	"time"

	"github.com/globalsign/mgo"
)

var db *mgo.Database
var dbInits []func(db *mgo.Database)

// ConnectDB connects to a mongodb database.
func ConnectDB(host string, port int, database, username, password, mechanism string) error {
	session, err := mgo.DialWithInfo(&mgo.DialInfo{
		Addrs:     []string{fmt.Sprintf("%s:%d", host, port)},
		Timeout:   30 * time.Second,
		Database:  database,
		Username:  username,
		Password:  password,
		Mechanism: mechanism,
		Source:    database,
	})
	if err != nil {
		return err
	}

	db = session.DB(database)

	return setupDB()
}

// HandleInit handles the initialization of the database
func HandleInit(function func(db *mgo.Database)) {
	dbInits = append(dbInits, function)
}

func setupDB() error {
	db.C("common.characters").EnsureIndexKey("name")
	db.C("common.characters").EnsureIndexKey("shortName")
	db.C("common.characters").EnsureIndexKey("author")
	err := db.C("common.characters").EnsureIndex(mgo.Index{
		Key:      []string{"nicks"},
		Unique:   true,
		DropDups: true,
	})
	if err != nil {
		return err
	}

	db.C("logbot3.logs").EnsureIndexKey("date")
	db.C("logbot3.logs").EnsureIndexKey("channel")
	db.C("logbot3.logs").EnsureIndexKey("channel", "open")
	db.C("logbot3.logs").EnsureIndexKey("open")
	db.C("logbot3.logs").EnsureIndexKey("oldId")
	db.C("logbot3.logs").EnsureIndexKey("characterIds")
	db.C("logbot3.logs").EnsureIndexKey("event")
	db.C("logbot3.logs").EnsureIndexKey("$text:channel", "$text:title", "$text:event", "$text:description", "$text:posts.nick", "$text:posts.text")

	err = db.C("server.changes").EnsureIndex(mgo.Index{
		Key:         []string{"date"},
		ExpireAfter: time.Hour * (24 * 14),
	})
	if err != nil {
		return err
	}

	for _, dbInit := range dbInits {
		dbInit(db)
	}

	return nil
}