/*!
 * Casper is a navigation utility for PhantomJS.
 *
 * Documentation: http://casperjs.org/
 * Repository:    http://github.com/n1k0/casperjs
 *
 * Copyright (c) 2011-2012 Nicolas Perriault
 *
 * Part of source code is Copyright Joyent, Inc. and other Node contributors.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 */

/*global console phantom require*/

if (!phantom || phantom.version.major !== 1 || phantom.version.minor < 5) {
    console.error('CasperJS needs at least PhantomJS v1.5.0');
    phantom.exit(1);
}

(function bootstrap(global) {
    "use strict";
    /**
     * Loads and initialize the CasperJS environment.
     */
    phantom.loadCasper = function loadCasper() {
        // Patching fs
        // TODO: watch for these methods being implemented in official fs module
        var fs = (function _fs(fs) {
            if (!fs.hasOwnProperty('basename')) {
                fs.basename = function basename(path) {
                    return path.replace(/.*\//, '');
                };
            }
            if (!fs.hasOwnProperty('dirname')) {
                fs.dirname = function dirname(path) {
                    return path.replace(/\\/g, '/').replace(/\/[^\/]*$/, '');
                };
            }
            if (!fs.hasOwnProperty('isWindows')) {
                fs.isWindows = function isWindows() {
                    var testPath = arguments[0] || this.workingDirectory;
                    return (/^[a-z]{1,2}:/i).test(testPath) || testPath.indexOf("\\\\") === 0;
                };
            }
            if (!fs.hasOwnProperty('pathJoin')) {
                fs.pathJoin = function pathJoin() {
                    return Array.prototype.join.call(arguments, this.separator);
                };
            }
            return fs;
        })(require('fs'));

        // casper root path
        if (!phantom.casperPath) {
            try {
                phantom.casperPath = phantom.args.map(function _map(i) {
                    var match = i.match(/^--casper-path=(.*)/);
                    if (match) {
                        return fs.absolute(match[1]);
                    }
                }).filter(function _filter(path) {
                    return fs.isDirectory(path);
                }).pop();
            } catch (e) {}
        }

        if (!phantom.casperPath) {
            console.error("Couldn't find nor compute phantom.casperPath, exiting.");
            phantom.exit(1);
        }

        // Embedded, up-to-date, validatable & controlable CoffeeScript
        phantom.injectJs(fs.pathJoin(phantom.casperPath, 'modules', 'vendors', 'coffee-script.js'));

        // custom global CasperError
        global.CasperError = function CasperError(msg) {
            Error.call(this);
            try {
                // let's get where this error has been thrown from, if we can
                this._from = arguments.callee.caller.name;
            } catch (e) {
                this._from = "anonymous";
            }
            this.message = msg;
            this.name = 'CasperError';
        };

        // standard Error prototype inheritance
        global.CasperError.prototype = Object.getPrototypeOf(new Error());

        // CasperJS version, extracted from package.json - see http://semver.org/
        phantom.casperVersion = (function getVersion(path) {
            var parts, patchPart, pkg, pkgFile;
            var fs = require('fs');
            pkgFile = fs.absolute(fs.pathJoin(path, 'package.json'));
            if (!fs.exists(pkgFile)) {
                throw new global.CasperError('Cannot find package.json at ' + pkgFile);
            }
            try {
                pkg = JSON.parse(require('fs').read(pkgFile));
            } catch (e) {
                throw new global.CasperError('Cannot read package file contents: ' + e);
            }
            parts  = pkg.version.trim().split(".");
            if (parts < 3) {
                throw new global.CasperError("Invalid version number");
            }
            patchPart = parts[2].split('-');
            return {
                major: ~~parts[0]       || 0,
                minor: ~~parts[1]       || 0,
                patch: ~~patchPart[0]   || 0,
                ident: patchPart[1]     || "",
                toString: function toString() {
                    var version = [this.major, this.minor, this.patch].join('.');
                    if (this.ident) {
                        version = [version, this.ident].join('-');
                    }
                    return version;
                }
            };
        })(phantom.casperPath);

        /**
         * Retrieves the javascript source code from a given .js or .coffee file.
         *
         * @param  String         file     The path to the file
         * @param  Function|null  onError  An error callback (optional)
         */
        phantom.getScriptCode = function getScriptCode(file, onError) {
            var scriptCode = fs.read(file);
            if (/\.coffee$/i.test(file)) {
                /*global CoffeeScript*/
                scriptCode = CoffeeScript.compile(scriptCode);
            }
            return scriptCode;
        };

        /**
         * Patching require() to allow loading of other modules than PhantomJS'
         * builtin ones.
         * Inspired by phantomjs-nodify: https://github.com/jgonera/phantomjs-nodify/
         * TODO: remove when PhantomJS has full module support
         */
        require = (function _require(require, requireDir) {
            var phantomBuiltins = ['fs', 'webpage', 'webserver', 'system'];
            var phantomRequire = phantom.__orig__require = require;
            var requireCache = {};
            return function _require(path) {
                var i, dir, paths = [],
                    fileGuesses = [],
                    file,
                    module = {
                        exports: {}
                    };
                if (phantomBuiltins.indexOf(path) !== -1) {
                    return phantomRequire(path);
                }
                if (path[0] === '.') {
                    paths.push.apply(paths, [
                        fs.absolute(path),
                        fs.absolute(fs.pathJoin(requireDir, path))
                    ]);
                } else if (path[0] === '/') {
                    paths.push(path);
                } else {
                    dir = fs.absolute(requireDir);
                    while (dir !== '' && dir.lastIndexOf(':') !== dir.length - 1) {
                        // nodejs compatibility
                        paths.push(fs.pathJoin(dir, 'node_modules', path));
                        dir = fs.dirname(dir);
                    }
                    paths.push(fs.pathJoin(requireDir, 'lib', path));
                    paths.push(fs.pathJoin(requireDir, 'modules', path));
                }
                paths.forEach(function _forEach(testPath) {
                    fileGuesses.push.apply(fileGuesses, [
                        testPath,
                        testPath + '.js',
                        testPath + '.coffee',
                        fs.pathJoin(testPath, 'index.js'),
                        fs.pathJoin(testPath, 'index.coffee'),
                        fs.pathJoin(testPath, 'lib', fs.basename(testPath) + '.js'),
                        fs.pathJoin(testPath, 'lib', fs.basename(testPath) + '.coffee')
                    ]);
                });
                file = null;
                for (i = 0; i < fileGuesses.length && !file; ++i) {
                    if (fs.isFile(fileGuesses[i])) {
                        file = fileGuesses[i];
                    }
                }
                if (!file) {
                    throw new Error("CasperJS couldn't find module " + path);
                }
                if (file in requireCache) {
                    return requireCache[file].exports;
                }
                var scriptCode = phantom.getScriptCode(file);
                var fn = new Function('__file__', 'require', 'module', 'exports', scriptCode);
                try {
                    fn(file, _require, module, module.exports);
                } catch (e) {
                    var error = new global.CasperError('__mod_error(' + path + '):: ' + e);
                    error.file = file;
                    throw error;
                }
                requireCache[file] = module;
                return module.exports;
            };
        })(require, phantom.casperPath);

        // BC < 0.6
        phantom.Casper = require('casper').Casper;

        // casper cli args
        phantom.casperArgs = require('cli').parse(phantom.args);

        // loaded status
        phantom.casperLoaded = true;
    };

    /**
     * Initializes the CasperJS Command Line Interface.
     */
    phantom.initCasperCli = function initCasperCli() {
        var fs = require("fs");

        if (!!phantom.casperArgs.options.version) {
            console.log(phantom.casperVersion.toString());
            phantom.exit(0);
        } else if (phantom.casperArgs.get(0) === "test") {
            phantom.casperScript = fs.absolute(fs.pathJoin(phantom.casperPath, 'tests', 'run.js'));
            phantom.casperArgs.drop("test");
        } else if (phantom.casperArgs.args.length === 0 || !!phantom.casperArgs.options.help) {
            var phantomVersion = [phantom.version.major, phantom.version.minor, phantom.version.patch].join('.');
            var f = require("utils").format;
            console.log(f('CasperJS version %s at %s, using PhantomJS version %s',
                        phantom.casperVersion.toString(),
                        phantom.casperPath, phantomVersion));
            console.log(fs.read(fs.pathJoin(phantom.casperPath, 'bin', 'usage.txt')));
            phantom.exit(0);
        }


        if (!phantom.casperScript) {
            phantom.casperScript = phantom.casperArgs.get(0);
        }

        if (!fs.isFile(phantom.casperScript)) {
            console.error('Unable to open file: ' + phantom.casperScript);
            phantom.exit(1);
        }

        // filter out the called script name from casper args
        phantom.casperArgs.drop(phantom.casperScript);

        // passed casperjs script execution
        phantom.injectJs(phantom.casperScript);
    };

    if (!phantom.casperLoaded) {
        try {
            phantom.loadCasper();
        } catch (e) {
            console.error("Unable to load casper environment: " + e);
            phantom.exit();
        }
    }

    if (true === phantom.casperArgs.get('cli')) {
        phantom.initCasperCli();
    }
})(window);