#!/usr/bin/env node

/**
 * fanfou.js
 * A node.js Fanfou client
 * © 2010 softboysxp.com
 */

/**
 * Copyright 2010 softboysxp.com. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

var http = require('http');
var fs = require('fs');

var credentials = {
	encodedCredentials: '',

	encodeCredentials: function(username, password) {
		this.encodedCredentials = 'Basic ' + (new Buffer(username + ':' + password)).toString('base64');
		return this.encodedCredentials;
	},

	loadCredentials: function() {
		try {
			this.encodedCredentials = fs.readFileSync(process.env['HOME'] + '/.fanfou_auth', 'utf-8');
		} catch (exception) {
			return null;
		}

		return this.encodedCredentials;
	},

	saveCredentials: function(username, password) {
		fs.writeFileSync(process.env['HOME'] + '/.fanfou_auth', this.encodeCredentials(username, password), 'utf-8');
	}
}

var fanfouClient = {
	FANFOU_API_PROTOCOL: 			'http',
	FANFOU_API_HOST: 				'api.fanfou.com',
	FANFOU_API_PUBLIC_TIMELINE: 	'/statuses/public_timeline.json',
	FANFOU_API_USER_TIMELINE: 		'/statuses/user_timeline.json',
	FANFOU_API_FRIENDS_TIMELINE: 	'/statuses/friends_timeline.json',
	FANFOU_API_REPLIES: 			'/statuses/replies.json',
	FANFOU_API_UPDATE: 				'/statuses/update.json',

	client: null,

	callAPI: function(method, api, params, callback) {
		if (!this.client) {
			this.client = http.createClient(80, this.FANFOU_API_HOST, this.FANFOU_API_PROTOCOL == 'https')
		}

		var request = this.client.request(method, api, {
			'Host': this.FANFOU_API_HOST,
			'Authorization': credentials.encodedCredentials,
			'Content-Type': 'application/x-www-form-urlencoded',
			'Content-Length': params ? params.length : 0
		});

		request.end(params, 'utf-8');

		request.on('response', function(response) {
			var body = '';

			response.on('data', function(chunk) {
				body += chunk;
			});

			response.on('end', function() {
				if (response.statusCode != 200) {
					var obj = eval('(' + body + ')');

					if (obj && obj.error) {
						console.log("ERROR: " + obj.error);
					} else {
						console.log("ERROR: " + body);
					}

					process.exit(-1);
				}

				if (body) {
					callback(eval('(' + body + ')'));
				}
			});
		});
	},

	getUserTimeline: function(callback) {
		this.callAPI('GET', this.FANFOU_API_USER_TIMELINE, null, callback);
	},

	getFriendsTimeline: function(callback) {
		this.callAPI('GET', this.FANFOU_API_FRIENDS_TIMELINE, null, callback);
	},

	getPublicTimeline: function(callback) {
		this.callAPI('GET', this.FANFOU_API_PUBLIC_TIMELINE, null, callback);
	},

	getReplies: function(callback) {
		this.callAPI('GET', this.FANFOU_API_REPLIES, null, callback);
	},

	postStatus: function(status, callback) {
		this.callAPI('POST', this.FANFOU_API_UPDATE, 'status=' + encodeURIComponent(status), callback);
	}
}

var fanfoujs = {
	list: function() {
		var displayStatus = function(statuses) {
			statuses.forEach(function(status) {
				console.log(status.user.screen_name + ': ' + status.text);
			});
		};

		var type = process.argv[3] ? process.argv[3] : "friends";

		switch(type) {
			case 'friends':
				fanfouClient.getFriendsTimeline(displayStatus);
				break;

			case 'public':
				fanfouClient.getPublicTimeline(displayStatus);
				break;

			case 'self':
				fanfouClient.getUserTimeline(displayStatus);
				break;

			case 'replies':
				fanfouClient.getReplies(displayStatus);
				break;

			default:
				this.usage();
		}
	},

	post: function() {
		if (process.argv.length != 4) {
			this.usage();
		}

		var status = process.argv[3];

		fanfouClient.postStatus(status, function(status) {
			console.log(status.user.screen_name + ': ' + status.text);
		});
	},

	usage: function() {
		console.log('Usage: "fanfou.js setup <username> <password>"');
		console.log('Usage: "fanfou.js list [friends(Default)/public/self/replies]"');
		console.log('Usage: "fanfou.js post <status>"');

		process.exit(0);
	},

	setup: function() {
		if (process.argv.length != 5) {
			this.usage();
		}

		credentials.saveCredentials(process.argv[3], process.argv[4]);
	},

	main: function() {
		if (process.argv.length < 3) {
			this.usage();
		}

		var command = process.argv[2];

		switch (command) {
			case 'setup':
				this.setup();
				break;

			case 'list':
			case 'post':
				if (!credentials.loadCredentials()) {
					console.log('Please run "node fanfou.js setup" first');
					process.exit(-1);
				}
				eval('this.' + command + '();');
				break;

			default:
				this.usage();
		}
	}
}

fanfoujs.main();