var cordova_util = require('./util'),
    path = require('path'),
    shell = require('shelljs'),
    config_parser = require('./config_parser'),
    android_parser = require('./metadata/android_parser'),
    ios_parser = require('./metadata/ios_parser'),
    blackberry_parser = require('./metadata/blackberry_parser'),
    fs = require('fs'),
    ls = fs.readdirSync,
    util = require('util'),
    http = require("http"),
    url = require("url");


function launch_server(www, platform_www, port) {
    port = port || 8000;

    // Searches these directories in order looking for the requested file.
    var searchPath = [www, platform_www];

    var server = http.createServer(function(request, response) {
        var uri = url.parse(request.url).pathname;

        function checkPath(pathIndex) {
            if (searchPath.length <= pathIndex) {
                response.writeHead(404, {"Content-Type": "text/plain"});
                response.write("404 Not Found\n");
                response.end();
                return;
            }

            var filename = path.join(searchPath[pathIndex], uri);

            fs.exists(filename, function(exists) {
                if(!exists) {
                    checkPath(pathIndex+1);
                    return;
                }

                if (fs.statSync(filename).isDirectory()) filename += path.sep + 'index.html';

                fs.readFile(filename, "binary", function(err, file) {
                    if(err) {
                        response.writeHead(500, {"Content-Type": "text/plain"});
                        response.write(err + "\n");
                        response.end();
                        return;
                    }

                    response.writeHead(200);
                    response.write(file, "binary");
                    response.end();
                });
            });
        }
        checkPath(0);
    }).listen(parseInt(''+port, 10));

    console.log("Static file server running at\n  => http://localhost:" + port + "/\nCTRL + C to shutdown");
    return server;
}

module.exports = function serve (platform, port) {
    var projectRoot = cordova_util.isCordova(process.cwd());

    if (!projectRoot) {
        throw 'Current working directory is not a Cordova-based project.';
    }

    var xml = path.join(projectRoot, 'www', 'config.xml');
    var cfg = new config_parser(xml);

    // Retrieve the platforms.
    var platforms = ls(path.join(projectRoot, 'platforms'));
    if (!platform) {
        throw 'You need to specify a platform.';
    } else if (platforms.length == 0) {
        throw 'No platforms to serve.';
    } else if (platforms.filter(function(x) { return x == platform }).length == 0) {
        throw platform + ' is not an installed platform.';
    }

    // If we got to this point, the given platform is valid.

    // Default port is 8000 if not given. This is also the default of the Python module.
    port = port || 8000;

    // Top-level www directory.
    var www = projectRoot + path.sep + 'www';

    var parser, platformPath;

    // Hack for testing despite its async nature.
    var returnValue = {};
    switch (platform) {
        case 'android':
            platformPath = path.join(projectRoot, 'platforms', 'android');
            parser = new android_parser(platformPath);

            // Update the related platform project from the config
            parser.update_project(cfg);
            var platform_www = parser.www_dir();
            returnValue.server = launch_server(www, platform_www, port);
            break;
        case 'blackberry-10':
            platformPath = path.join(projectRoot, 'platforms', 'blackberry-10');
            parser = new blackberry_parser(platformPath);

            // Update the related platform project from the config
            parser.update_project(cfg, function() {
                // Shell it
                returnValue.server = launch_server(www, parser.www_dir(), port);
            });
            break;
        case 'ios':
            platformPath = path.join(projectRoot, 'platforms', 'ios');
            js = path.join(__dirname, '..', 'lib', 'ios', 'CordovaLib', 'javascript', 'cordova.ios.js');
            parser = new ios_parser(platformPath);
            // Update the related platform project from the config
            parser.update_project(cfg, function() {
                returnValue.server = launch_server(www, parser.www_dir(), port);
            });
            break;
    }
    return returnValue;
};