const date = '\\d{4}-\\d{2}-\\d{2}',
	contextre = /\B@\w+/g;
	projectre = /\B\+\w+/g,
	tagre = /[\w\-_]+:[\w\-_]+/g;

const pluckAll = (raw, re) => {
	let matches = raw.match(re);
	if (matches) {
		matches.forEach(p => {
			let position = raw.indexOf(p);
			raw = raw.substr(0, position) + raw.substr(position + p.length);
		});
	}
	return [raw, matches];
}

const parse = raw => {
	let todo = {};
	if (raw.indexOf('x ') === 0) {
		todo.done = true;
		raw = raw.substr(2);

		let completed = new RegExp('^' + date + ' ').exec(raw);
		if (completed) {
			todo.completed = completed[0].trim();
			raw = raw.substr(11);
		}
	}

	let priority = /^\(([a-z])\) /.exec(raw);
	if (priority) {
		todo.priority = priority[1].toUpperCase()
		raw = raw.substr(4);
	}

	let created = new RegExp('^' + date + ' ').exec(raw);
	if (created) {
		todo.created = created[0].trim();
		raw = raw.substr(11);
	}

	let projects = [];
	[raw, projects] = pluckAll(raw, projectre);
	if (projects) {
		todo.projects = projects;
	}

	let contexts = [];
	[raw, contexts] = pluckAll(raw, contextre);
	if (contexts) {
		todo.contexts = contexts;
	}

	let tags = [];
	[raw, tags] = pluckAll(raw, tagre);
	if (tags) {
		tags.forEach(t => {
			let [k, v] = t.split(':');
			todo[k] = v;
		});
	}

	raw = raw.trim();
	raw = raw.replace(/\s{2,}/g, ' ');
	todo.text = raw;
	return todo;
}