var sqlite = require('sqlite3').verbose();
var async = require('async');

var config = require('./config.js').config;

var db = new sqlite.Database(config.dbPath);

// Function to get a count of current galleries
// Returns count of galleries
exports.countGalleries = function(cb) {
    db.get('SELECT count(id) as count FROM galleries;', function(err, count) {
        cb(count.count);
    });
}

// Function to get a count of current photos
// Returns count of tags
exports.countPhotos = function(cb) {
    db.get('SELECT count(id) as count FROM photos;', function(err, count) {
        cb(count.count);
    });
}

// Function to tag a photo with a list of tag names
// Inputs: Photo ID, List of Tag names
// Does not return.
exports.tagPhoto = function (photoId, tags) {

    console.log('Deleting old tags');
    db.run('DELETE FROM photoTags WHERE photoId = '+photoId+';',
        function(err) {
            console.log('Old tags deleted');
            for (var i = 0, size = tags.length; i < size; i++) {
                getOrCreateTag(tags[i], function(row) {
                    db.run('INSERT INTO photoTags (photoId, tagId) \
                        VALUES ('+photoId+', '+row.id+');',
                        function(err) {
                            if (err) {
                                console.log(err);
                            }
                            else {
                                console.log('Photo '+photoId+' tagged as '+row.name);
                            }
                        });
                });

            }
    });
}


// Function to get tag ids associated with a particular photo id
// Inputs: Photo ID
// Returns: Records associated with tags of that photo id
var getPhotoTags = function (photoId, cb) {
    db.all('SELECT tagId FROM photoTags WHERE photoId = '+photoId+';',
        function(err, rows) {
            if (err) {
                console.log(err);
            }
            else {
                var tagList = [];
                for (row in rows) {
                    tagList.push(rows[row].tagId);
                }
                tagList = tagList.join(', ');
                console.log('Tag ids for photo '+photoId+': '+tagList);
                db.all('SELECT * FROM tags WHERE id IN ('+tagList+');',
                    function(err, rows) {
                        if (err) {
                            console.log(err);
                        }
                        else {
                            cb(rows);
                        }
                })
            }
    })
}

exports.getPhotoTags = getPhotoTags;


// Function that returns all the photo tags as a space separated string.
// Inputs: Photo ID, callback function.
// Returns: callback of string with all tags separated by spaces.
var getPhotoTagsAsString = function(photoId, cb) {
    getPhotoTags(photoId, function(tags) {
        var str = false;
        for (tag in tags) {
            if (!str) {
                str = tags[tag].name;
            }
            else {
                str = str + ' ' + tags[tag].name;
            }
        }
        console.log("Tags for photo "+photoId+": "+str);
        cb(str);
    })
}

exports.getPhotoTagsAsString = getPhotoTagsAsString;

// Function to get a photo record by the id of the photo
// Returns the photo record
exports.getPhotoById = function(id, cb) {
    db.get('SELECT * FROM photos WHERE id = ?', id, function(err, row) {
        if (err) console.log(err);
        cb(row);
    });
}

// Function to create a new photo
// Returns the photo id
exports.createPhoto = function(title, slug, markdown, extension, mimetype, photoDate, updatedDate,
    createDate, path, cb) {
    console.log('Creating new photo: '+slug);
    db.run('INSERT INTO photos (\
            title, \
            slug, \
            description, \
            path, \
            extension, \
            mimetype, \
            photoDate, \
            createDate, \
            updatedDate, \
            lastGenerateDate, \
            lastUpload) \
            VALUES (\
            "'+title+'", \
            "'+slug+'", \
            "'+markdown+'", \
            "'+path+'", \
            "'+extension+'", \
            "'+mimetype+'", \
            "'+photoDate+'", \
            "'+createDate+'", \
            "'+updatedDate+'", \
            (strftime("%s","1900-01-01 00:00")*1000), \
            (strftime("%s","1900-01-01 00:00")*1000));',
        function(err, row) {
            if (!err) {
                console.log('Photo '+slug+' created.');
            }
            else {
                console.log('Error: '+err);
            }
            db.get('SELECT * FROM photos WHERE title = "'+title+'" AND createDate = '+createDate+';', function(err, row){
                if (err) console.log(err);
                cb(err, row);
            })
        });
}

// Function to update an existing post record
// Returns the post object
exports.updatePhoto = function(id, title, slug, markdown, photoDate, cb) {
    console.log("updatePost called.");
    db.run('UPDATE photos SET \
        title = "'+title+'", \
        slug = "'+slug+'", \
        description = "'+markdown+'", \
        photoDate = '+helper.dateToEpoch(photoDate)+', \
        updatedDate = '+helper.dateToEpoch(new Date())+' \
        WHERE id = '+id+';',
        function(err) {
            console.log('updatePhoto UPDATE result: '+err);
            db.get('SELECT * FROM photos WHERE id = '+id+';', function(err, row) {
                console.log('updatePhoto SELECT result: ' + err);
                cb(row);
            });
        });
}