/*
Copyright 2011 Google Inc.

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 (
	"flag"
	"fmt"
	"os"
	"strings"

	"camlistore.org/pkg/mysqlindexer"

	mysql "camli/third_party/github.com/Philio/GoMySQL"
)

var flagUser = flag.String("user", "root", "MySQL admin user")
var flagPassword = flag.String("password", "(prompt)", "MySQL admin password")
var flagHost = flag.String("host", "localhost", "MySQ host[:port]")
var flagDatabase = flag.String("database", "", "MySQL camlistore to wipe/create database")

var flagWipe = flag.Bool("wipe", false, "Wipe the database and re-create it?")
var flagIgnore = flag.Bool("ignoreexists", false, "Treat existence of the database as okay and exit.")

func main() {
	flag.Parse()
	if *flagDatabase == "" {
		exitf("--database flag required")
	}

	db, err := mysql.DialTCP(*flagHost, *flagUser, *flagPassword, "")
	if err != nil {
		exitf("Error connecting to database: %v", err)
	}

	dbname := *flagDatabase
	exists := dbExists(db, dbname)
	if exists {
		if *flagIgnore {
			return
		}
		if !*flagWipe {
			exitf("Databases %q already exists, but --wipe not given. Stopping.", dbname)
		}
		do(db, "DROP DATABASE "+dbname)
	}
	do(db, "CREATE DATABASE "+dbname)
	do(db, "USE "+dbname)

	for _, tableSql := range mysqlindexer.SQLCreateTables() {
		do(db, tableSql)
	}
	do(db, fmt.Sprintf(`REPLACE INTO meta VALUES ('version', '%d')`, mysqlindexer.SchemaVersion()))
}

func do(db *mysql.Client, sql string) {
	err := db.Query(sql)
	if err == nil {
		return
	}
	exitf("Error %v running SQL: %s", err, sql)
}

func dbExists(db *mysql.Client, dbname string) bool {
	check(db.Query("SHOW DATABASES"))
	result, err := db.UseResult()
	check(err)
	defer result.Free()
	for {
		row := result.FetchRow()
		if row == nil {
			break
		}
		if row[0].(string) == dbname {
			return true
		}
	}
	return false
}

func check(err error) {
	if err == nil {
		return
	}
	panic(err)
}

func exitf(format string, args ...interface{}) {
	if !strings.HasSuffix(format, "\n") {
		format = format + "\n"
	}
	fmt.Fprintf(os.Stderr, format, args...)
	os.Exit(1)
}