var fs = require('fs');
var async = require("async");
module.exports = function(s,config){
    s.onBeforeDatabaseLoadExtensions.forEach(function(extender){
        extender(config)
    })
    //sql/database connection with knex
    s.databaseOptions = {
      client: config.databaseType,
      connection: config.db,
    }
    if(s.databaseOptions.client.indexOf('sqlite')>-1){
        s.databaseOptions.client = 'sqlite3'
        s.databaseOptions.useNullAsDefault = true
        try{
            require('sqlite3')
        }catch(err){
            console.log('Installing SQlite3 Module...')
            require('child_process').execSync('npm install sqlite3 --unsafe-perm')
        }
    }
    if(s.databaseOptions.client === 'sqlite3' && s.databaseOptions.connection.filename === undefined){
        s.databaseOptions.connection.filename = s.mainDirectory+"/shinobi.sqlite"
    }
    s.mergeQueryValues = function(query,values){
        if(!values){values=[]}
        var valuesNotFunction = true;
        if(typeof values === 'function'){
            var values = [];
            valuesNotFunction = false;
        }
        if(values&&valuesNotFunction){
            var splitQuery = query.split('?')
            var newQuery = ''
            splitQuery.forEach(function(v,n){
                newQuery += v
                var value = values[n]
                if(value){
                    if(isNaN(value) || value instanceof Date){
                        newQuery += "'"+value+"'"
                    }else{
                        newQuery += value
                    }
                }
            })
        }else{
            newQuery = query
        }
        return newQuery
    }
    s.getUnixDate = function(value){
        newValue = new Date(value).valueOf()
        return newValue
    }
    s.stringToSqlTime = function(value){
        newValue = new Date(value.replace('T',' '))
        return newValue
    }
    var runQuery = async.queue(function(data, callback) {
        s.databaseEngine
        .raw(data.query,data.values)
        .asCallback(callback)
    }, 4);
    s.sqlQuery = function(query,values,onMoveOn,hideLog){
        if(!values){values=[]}
        if(typeof values === 'function'){
            var onMoveOn = values;
            var values = [];
        }
        if(!onMoveOn){onMoveOn=function(){}}
        // if(s.databaseOptions.client === 'pg'){
        //     query = query
        //         .replace(/ NOT LIKE /g," NOT ILIKE ")
        //         .replace(/ LIKE /g," ILIKE ")
        // }
        if(config.debugLog === true){
            var mergedQuery = s.mergeQueryValues(query,values)
            s.debugLog('s.sqlQuery QUERY',mergedQuery)
        }
        if(!s.databaseEngine || !s.databaseEngine.raw){
            s.connectDatabase()
        }
        return runQuery.push({
            query: query,
            values: values
        },function(err,r){
            if(err && !hideLog){
                console.log('s.sqlQuery QUERY ERRORED',query)
                console.log('s.sqlQuery ERROR',err)
            }
            if(onMoveOn && typeof onMoveOn === 'function'){
                switch(s.databaseOptions.client){
                    case'sqlite3':
                        if(!r)r=[]
                    break;
                    default:
                        if(r)r=r[0]
                    break;
                }
                onMoveOn(err,r)
            }
        })
    }
    s.connectDatabase = function(){
        s.databaseEngine = require('knex')(s.databaseOptions)
    }
    s.preQueries = function(){
        var knex = s.databaseEngine
        var mySQLtail = ''
        if(config.databaseType === 'mysql'){
            mySQLtail = ' ENGINE=InnoDB DEFAULT CHARSET=utf8'
        }
        //add Presets table and modernize
        var createPresetsTableQuery = 'CREATE TABLE IF NOT EXISTS `Presets` (  `ke` varchar(50) DEFAULT NULL,  `name` text,  `details` text,  `type` varchar(50) DEFAULT NULL)'
        s.sqlQuery( createPresetsTableQuery + mySQLtail + ';',[],function(err){
            if(err)console.error(err)
            if(config.databaseType === 'sqlite3'){
                var aQuery = "ALTER TABLE Presets RENAME TO _Presets_old;"
                    aQuery += createPresetsTableQuery
                    aQuery += "INSERT INTO Presets (`ke`, `name`, `details`, `type`) SELECT `ke`, `name`, `details`, `type` FROM _Presets_old;COMMIT;DROP TABLE _Presets_old;"
            }else{
                s.sqlQuery('ALTER TABLE `Presets` CHANGE COLUMN `type` `type` VARCHAR(50) NULL DEFAULT NULL AFTER `details`;',[],function(err){
                    if(err)console.error(err)
                },true)
            }
        },true)
        //add Schedules table, will remove in future
        s.sqlQuery("CREATE TABLE IF NOT EXISTS `Schedules` (`ke` varchar(50) DEFAULT NULL,`name` text,`details` text,`start` varchar(10) DEFAULT NULL,`end` varchar(10) DEFAULT NULL,`enabled` int(1) NOT NULL DEFAULT '1')" + mySQLtail + ';',[],function(err){
            if(err)console.error(err)
        },true)
        //add Timelapses and Timelapse Frames tables, will remove in future
        s.sqlQuery("CREATE TABLE IF NOT EXISTS `Timelapses` (`ke` varchar(50) NOT NULL,`mid` varchar(50) NOT NULL,`details` longtext,`date` date NOT NULL,`time` timestamp NOT NULL,`end` timestamp NOT NULL,`size` int(11)NOT NULL)" + mySQLtail + ';',[],function(err){
            if(err)console.error(err)
        },true)
        s.sqlQuery("CREATE TABLE IF NOT EXISTS `Timelapse Frames` (`ke` varchar(50) NOT NULL,`mid` varchar(50) NOT NULL,`details` longtext,`filename` varchar(50) NOT NULL,`time` timestamp NULL DEFAULT NULL,`size` int(11) NOT NULL)" + mySQLtail + ';',[],function(err){
            if(err)console.error(err)
        },true)
        //add Cloud Videos table, will remove in future
        s.sqlQuery('CREATE TABLE IF NOT EXISTS `Cloud Videos` (`mid` varchar(50) NOT NULL,`ke` varchar(50) DEFAULT NULL,`href` text NOT NULL,`size` float DEFAULT NULL,`time` timestamp NULL DEFAULT NULL,`end` timestamp NULL DEFAULT NULL,`status` int(1) DEFAULT \'0\',`details` text)' + mySQLtail + ';',[],function(err){
            if(err)console.error(err)
        },true)
        //add Cloud Timelapse Frames table, will remove in future
        s.sqlQuery('CREATE TABLE IF NOT EXISTS `Cloud Timelapse Frames` (`ke` varchar(50) NOT NULL,`mid` varchar(50) NOT NULL,`href` text NOT NULL,`details` longtext,`filename` varchar(50) NOT NULL,`time` timestamp NULL DEFAULT NULL,`size` int(11) NOT NULL)' + mySQLtail + ';',[],function(err){
            if(err)console.error(err)
        },true)
        //create Files table
        var createFilesTableQuery = "CREATE TABLE IF NOT EXISTS `Files` (`ke` varchar(50) NOT NULL,`mid` varchar(50) NOT NULL,`name` tinytext NOT NULL,`size` float NOT NULL DEFAULT '0',`details` text NOT NULL,`status` int(1) NOT NULL DEFAULT '0',`time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP)"
        s.sqlQuery(createFilesTableQuery + mySQLtail + ';',[],function(err){
            if(err)console.error(err)
            //add time column to Files table
            if(config.databaseType === 'sqlite3'){
                var aQuery = "ALTER TABLE Files RENAME TO _Files_old;"
                    aQuery += createPresetsTableQuery
                    aQuery += "INSERT INTO Files (`ke`, `mid`, `name`, `details`, `size`, `status`, `time`) SELECT `ke`, `mid`, `name`, `details`, `size`, `status`, `time` FROM _Files_old;COMMIT;DROP TABLE _Files_old;"
            }else{
                s.sqlQuery('ALTER TABLE `Files`	ADD COLUMN `time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP AFTER `status`;',[],function(err){
                    if(err && err.sqlMessage && err.sqlMessage.indexOf('Duplicate') === -1)console.error(err)
                },true)
            }
        },true)
        delete(s.preQueries)
    }
}