var fs = require('fs');
var gm = require('gm');
var mkdirp = require('mkdirp');
var markdown = require( "markdown" ).markdown;
var jade = require('jade');


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

var generatePhotoSizesById = function generatePhotoSizesById(id, cb) {
    db.getPhotoById(id, function (photo) {
        if (photo) console.log('Got photo record for: '+photo.slug);
        var shortDate = helper.epochToShortDateString(photo.photoDate);
        var failure = false;

        var folder = config.genDir+'/photos/'+photo.slug;

        mkdirp(folder, function(err) {
            if (err) console.log(err);
            for (var size in config.imageSizes) {
                console.log('Generating '+size+' for '+photo.slug);

                var file = folder + '/'+size+'.'+photo.extension;

                (function(size){
                    gm(photo.path)
                    .autoOrient()
                    .resize(config.imageSizes[size], config.imageSizes[size])
                    .write(file,
                        function(err) {
                            if (err) {
                                console.log(photo.slug+' resize failed.');
                                failure = true;
                            }
                            else {
                                console.log(photo.slug+' '+size+' generated.');
                            }
                        }
                    );
                })(size);

            }

        });

        cb(failure);
    });
}

exports.generatePhotoSizesById = generatePhotoSizesById;

var generatePhotoPage = function (id, cb) {
    db.getPhotoById(id, function(photo) {
        console.log('Fetching photo id: '+id);
        var description = markdown.toHTML(photo.description);
        var photoDate = helper.epochToShortDateString(photo.photoDate);
        var url = '/photos/'+photo.slug+'/';
        var filepath = config.genDir+url;
        var filename = filepath+'index.html';
        var options = {
            pretty: false,
            title: photo.title,
            description: description,
            slug: photo.slug,
            url: url,
            extension: photo.extension,
            postDate: photo.photoDate
        };

        console.log('Rendering photo: '+photo.title);
        var jadeOut = jade.renderFile('views/render-photo.jade', options);

        console.log('Creating directory: '+filepath);
        mkdirp(filepath, function(err) {
            if (err) {
                console.log(err);
            }
            else {
                console.log('Writing to file: '+filename);

                fs.writeFile(filename, jadeOut, 'utf-8', function(err) {
                    if (err) console.log(err);
                    cb(err);
                });
            }
        });
    });
}

exports.generatePhotoPage = generatePhotoPage;