'use strict';

var ParentScm = require('./base').Scm,
	inherits = require('util').inherits;

function Scm(params) {
	ParentScm.call(this, params);
}

exports.Scm = Scm;

inherits(Scm, ParentScm);

Scm.prototype.defaultRev = 'default';

Scm.prototype._revTemplate = (
	'{node|short};;;{author};;;{date|date};;;{desc}'
);

Scm.prototype._parseRev = function(str) {
	var parts = str.split(';;;');
	return {
		id: parts[0],
		author: parts[1],
		date: new Date(parts[2]).getTime(),
		comment: parts[3]
	};
};

Scm.prototype.clone = function(dst, rev, callback) {
	var self = this;
	this.run({
		cmd: 'hg',
		args: ['clone', '--rev', rev, this.repository, dst]
	}, function(err) {
		self.cwd = dst;
		callback(err);
	});
};

Scm.prototype.pull = function(rev, callback) {
	this.run({cmd: 'hg', args: ['pull', '--rev', rev]}, callback);
};

Scm.prototype.getCurrent = function(callback) {
	var self = this;
	self.run({cmd: 'hg', args: [
		'parent', '--template', self._revTemplate
	]}, function(err, stdout) {
		callback(err, !err && self._parseRev(stdout));
	});
};

Scm.prototype.getChanges = function(rev1, rev2, callback) {
	var self = this;
	self.run({cmd: 'hg', args: [
		'log', '--rev', rev2 + ':' + rev1,
		'--template', self._revTemplate + '\n'
	]}, function(err, stdout) {
		callback(err, !err &&  stdout.split('\n').slice(0, -2).map(function(str) {
			return self._parseRev(str);
		}));
	});
};

Scm.prototype.update = function(rev, callback) {
	this.run({cmd: 'hg', args: ['up', rev]}, callback);
};