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

exports.getSermon = function(sermonId, callback, includeDeleted){
    var query = "SELECT * FROM Sermons WHERE Id = ? AND DeletedDate IS NULL;";
    if (includeDeleted === true){
        query = "SELECT * FROM Sermons WHERE Id = ?;";
    }
    connection.query(query,[sermonId],function(error,rows,fields){
        if (error){
            console.log(error);
            callback(error);
            return;
        }
        
        var sermon = null;
        if (rows.length > 0){
            sermon = {};
            sermon.id = rows[0].Id;
            sermon.date = rows[0].Date;
            sermon.title = rows[0].Title;
            sermon.author = rows[0].Author;
            sermon.description = rows[0].Description;
            sermon.file = rows[0].File;
        }
        callback(null,sermon);
    });
}


exports.getSermons = function(pageSize, pageNumber,callback){
    var offset = (pageNumber - 1) * pageSize;
    connection.query("SELECT * FROM Sermons WHERE DeletedDate IS NULL ORDER BY Date DESC LIMIT ?,?;",[offset,pageSize],function(err,rows,fields){
        if (err){
            console.log(err);
            callback(err);
            return;
        }
        var sermons = [];
        for (var i = 0; i < rows.length; i++){
            var sermon = {};
            sermon.id = rows[i].Id;
            sermon.date = rows[i].Date;
            sermon.title = rows[i].Title;
            sermon.author = rows[i].Author;
            sermon.description = rows[i].Description;
            sermon.file = rows[i].File;
            sermons.push(sermon);
        }
        callback(null,sermons);
    });
};

exports.searchSermons = function(pageSize, pageNumber, searchTerm, callback){
    var offset = (pageNumber - 1) * pageSize;
    searchTerm = '%' + searchTerm + '%';
    connection.query("SELECT * FROM Sermons WHERE DeletedDate IS NULL AND (Title LIKE ? OR Author LIKE ? OR Description LIKE ? OR Date LIKE ?) ORDER BY Id DESC LIMIT ?,?;",[searchTerm,searchTerm,searchTerm,searchTerm,offset,pageSize],function(err,rows,fields){
        if (err){
            console.log(err);
            callback(err);
            return;
        }
        var sermons = [];
        for (var i = 0; i < rows.length; i++){
            var sermon = {};
            sermon.id = rows[i].Id;
            sermon.date = rows[i].Date;
            sermon.title = rows[i].Title;
            sermon.author = rows[i].Author;
            sermon.description = rows[i].Description;
            sermon.file = rows[i].File;
            sermons.push(sermon);
        }
        callback(null,sermons);
    });
}

exports.insertSermon = function(dateOrSermonObject, titleOrCallbackFunction, timezoneOffset, author, description, file, callback){
    if (typeof title === 'function'){
        insertSermonFromObject(dateOrSermonObject,titleOrCallbackFunction);
        return;
    }
    //Date is passed in as milliseconds from 1970 so we will convert it here
    //Wrap it in another Date object to getTime so that we can make sure the date is in UTC format
    dateOrSermonObject = new Date(new Date(+dateOrSermonObject).getTime());
    connection.query("INSERT INTO Sermons (CreatedDate,ModifiedDate,Id,Date,Title,Author,Description,File) VALUES(?,CURRENT_TIMESTAMP,NULL,?,?,?,?,?)",[new Date,dateOrSermonObject,titleOrCallbackFunction,author,description,file],function(error,result){
        if (error){
            console.log(error);
            callback(error);
            return;
        }
        dbSermons.getSermon(result.insertId,function(error,sermon){
            if (error){
                callback(error);
                return;
            }
            callback(null,sermon);
        });
    });
}

function insertSermonFromObject(sermon, callback){
    dbSermons.insertSermon(sermon.date,sermon.title,sermon.timezoneOffset,sermon.author,sermon.description,sermon.file,callback);
}

exports.updateSermon = function(sermonIdOrSermonObject, dateOrCallbackFunction, title, author, description, callback){
    if (typeof dateOrCallbackFunction == 'function'){
        updateSermonFromObject(sermonIdOrSermonObject,callback);
        return;
    }
    dateOrCallbackFunction = new Date(dateOrCallbackFunction);
    connection.query("UPDATE Sermons SET ModifiedDate = CURRENT_TIMESTAMP, Date = ?, Title = ?, Author = ?, Description = ? WHERE Id = ?",[dateOrCallbackFunction,title,author,description,sermonIdOrSermonObject],function(error,result){
        if (error){
            console.log(error);
            callback(error);
            return;
        }
        dbSermons.getSermon(sermonIdOrSermonObject,function(error,sermon){
            if (error){
                callback(error);
                return;
            }
            callback(null,{"changedRows":result.changedRows,"sermon":sermon});
        });
    });
};

function updateSermonFromObject(sermon, callback){
    dbSermons.updateSermon(sermon.id,sermon.date,sermon.title,sermon.author,sermon.description,callback);
}

exports.deleteSermon = function(sermonIdOrSermonObject, callback){
    if (typeof sermonIdOrSermonObject !== 'number'){
        sermonIdOrSermonObject = sermonIdOrSermonObject.id;
    }
    connection.query("UPDATE Sermons SET DeletedDate = CURRENT_TIMESTAMP WHERE Id = ?;",[sermonIdOrSermonObject],function(error,result){
        if (error){
            console.log(error);
            callback(error);
            return;
        }
        dbSermons.getSermon(sermonIdOrSermonObject,function(error,sermon){
            if (error){
                callback(error);
                return;
            }
            console.log(sermon);
            callback(null,{"affectedRows":result.affectedRows,"sermon":sermon});
        },true);
    });
}