var walk = require('walk');
var fs = require('fs');
var path = require('path');

var configuration;
var files = [];

exports.start = function(config) {
	configuration = config;
	var walker = walk.walk(configuration.dir, { followLinks: false });

walker.on("directories", function (root, dirAr, next) {
	var lastDir = path.join(__dirname, root).split('/');
	if((lastDir.length - __dirname.split('/').length) < 2) {
		dirAr.forEach(function(dir) {
			files[dir.name] = { name: dir.name, template:
				path.join(configuration.defaultSlides,
				configuration.template) , slides: [] };
		});
	}
	next();
}).on("file", function (root, fileStats, next) {

	if(fileStats.name == configuration.description) { 
		next();
	}
	else if(fileStats.name == configuration.template) {
		var lastDir = root.split('/');
		files[lastDir[lastDir.length - 1]]['template'] = path.join(lastDir[lastDir.length - 1], fileStats.name);
		next();
	} else {
		var lastDir = path.join(root).split('/');
		if(files.hasOwnProperty(lastDir[lastDir.length - 1])) {
			var ext = path.extname(fileStats.name);
			var type = 'image';
			switch (ext) {
				case '.mp4':
				case '.avi':
				case '.ogv':
				case '.mkv':
					type = 'video';
					break;
			}
			files[lastDir[lastDir.length - 1]]['slides'].push({ type: type, file: path.join(lastDir[lastDir.length - 1], fileStats.name), head: '', text: ''});
		}
		next();
	}
}).on("errors", function (root, nodeStatsArray, next) {
	next();
}).on("end", function () {

	for(var slideset in files) {
		if(!files.hasOwnProperty(slideset)) { continue; }
		var data = fs.readFileSync(__dirname+'/'+configuration.dir+'/'+slideset+'/desc');
		var descs = data.toString().split('\n');
		for(var file in files[slideset]['slides']) {
			if(!files[slideset]['slides'].hasOwnProperty(file)) { continue; }
			if(!files[slideset]['slides'][file].hasOwnProperty('file')) { continue; }
			for(var desc in descs) {
				if(!descs.hasOwnProperty(desc)) { continue; }
				var info = descs[desc].split('|');
				var comp = files[slideset]['slides'][file]['file'].split('/');
				if(info[0] === comp[comp.length - 1]) {
					files[slideset]['slides'][file]['head'] = info[1];
					files[slideset]['slides'][file]['text'] = info[2];
				}
			}
		}
	}
});
};

exports.getSlides = function(slideset, cb) {
	
	for (var searchset in files) {
		if(!files.hasOwnProperty(searchset)) { continue; }
		if(files[searchset].name == slideset) {
			cb(files[searchset]);
		}
	}
};