var connection = require("./connection");
var dbEvents = this;

exports.getEvent = function(eventId, callback, includeDeleted){
    var query = "SELECT * FROM Events WHERE Id = ? AND DeletedDate IS NULL;";
    if (includeDeleted === true){
        query = "SELECT * FROM Events WHERE Id = ?;";
    }
    connection.query(query,[eventId],function(error,rows,fields){
        if (error){
            console.log(error);
            callback(error);
            return;
        }
        
        var event = null;
        if (rows.length > 0){
            event = {};
            event.id = rows[0].Id;
            event.startDate = rows[0].StartDate;
            event.endDate = rows[0].EndDate;
            event.title = rows[0].Title;
            event.description = rows[0].Description;
            event.timezoneOffset = rows[0].TimezoneOffset;
        }
        callback(null,event);
    });
}


exports.getEvents = function(pageSize, pageNumber, callback){
    var offset = (pageNumber - 1) * pageSize;
    var dte = new Date();
    connection.query("SELECT * FROM Events WHERE DeletedDate IS NULL AND StartDate >= ? ORDER BY StartDate ASC LIMIT ?,?;",[dte,offset,pageSize],function(err,rows,fields){
        if (err){
            console.log(err);
            callback(err);
            return;
        }
        var events = [];
        for (var i = 0; i < rows.length; i++){
            var event = {};
            event.id = rows[i].Id;
            event.startDate = rows[i].StartDate;
            event.endDate = rows[i].EndDate;
            event.title = rows[i].Title;
            event.description = rows[i].Description;
            event.timezoneOffset = rows[i].TimezoneOffset;
            events.push(event);
        }
        console.log(events);
        callback(null,events);
    });
};

exports.insertEvent = function(titleOrEventObject, startDateOrCallbackFunction, endDate, timezoneOffset, description, callback){
    if (typeof startDateOrCallbackFunction === 'function'){
        insertEventFromObject(titleOrEventObject, startDateOrCallbackFunction);
        return;
    }
    //Date is passed as milliseconds since 1970 so we will convert it to a date object
    //Wrap it in another Date object to getTime so that we can make sure the date is in UTC format
    var startDte = new Date(new Date(+startDateOrCallbackFunction).getTime());
    console.log(startDte);
    var endDte = new Date(new Date(+endDate).getTime());
    connection.query("INSERT INTO Events (CreatedDate,ModifiedDate,Id,Title,StartDate,EndDate,TimezoneOffset,Description) VALUES(CURRENT_TIMESTAMP,CURRENT_TIMESTAMP,NULL,?,?,?,?,?)",[titleOrEventObject,startDte,endDte,timezoneOffset,description],function(error,result){
        if (error){
            console.log(error);
            callback(error);
            return;
        }
        dbEvents.getEvent(result.insertId,function(error,event){
            if (error){
                callback(error);
                return;
            }
            callback(null,event);
        });
    });
}

function insertEventFromObject(event, callback){
    dbSermons.insertSermon(event.title,event.startDate,event.endDate,event.timezoneOffset,event.description,callback);
}

exports.deleteEvent = function(eventIdOrEventObject, callback){
    if (typeof eventIdOrEventObject !== 'number'){
        eventIdOrEventObject = eventIdOrEventObject.id;
    }
    connection.query("UPDATE Events SET DeletedDate = CURRENT_TIMESTAMP WHERE Id = ?;",[eventIdOrEventObject],function(error,result){
        if (error){
            console.log(error);
            callback(error);
            return;
        }
        dbEvents.getEvent(eventIdOrEventObject,function(error,event){
            if (error){
                callback(error);
                return;
            }
            console.log(event);
            callback(null,{"affectedRows":result.affectedRows,"event":event});
        },true);
    });
}