/*!
 * Casper is a navigation utility for PhantomJS.
 *
 * Documentation: http://n1k0.github.com/casperjs/
 * 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.
 *
 */

if (!phantom.casperLoaded) {
    // see http://semver.org/
    phantom.casperVersion = {
        major: 0,
        minor: 6,
        patch: 0,
        ident: 'alpha',
        toString: function() {
            var version = [this.major, this.minor, this.patch].join('.');
            if (this.ident) {
                version = [version, this.ident].join('-');
            }
            return version;
        }
    };

    // Patching fs
    // TODO: watch for these methods being implemented in official fs module
    var fs = (function(fs) {
        if (!fs.hasOwnProperty('basename')) {
            fs.basename = function(path) {
                return path.replace(/.*\//, '');
            };
        }
        if (!fs.hasOwnProperty('dirname')) {
            fs.dirname = function(path) {
                return path.replace(/\/[^\/]*\/?$/, '');
            };
        }
        if (!fs.hasOwnProperty('pathJoin')) {
            fs.pathJoin = function() {
                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(i) {
                var match = i.match(/^--casper-path=(.*)/);
                if (match) {
                    return fs.absolute(match[1]);
                }
            }).filter(function(path) {
                return fs.isDirectory(path);
            }).pop();
        } catch (e) {}
    }
    if (!phantom.casperPath) {
        console.error("Couldn't find not 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'));

    // Adding built-in capabilities to phantom object
    phantom.sourceIds = {};

    phantom.getErrorMessage = function(e) {
        return (e.fileName || this.sourceIds[e.sourceId]) + ':' + e.line + ' ' + e;
    };

    phantom.getScriptCode = function(file, onError) {
        var scriptCode = fs.read(file);
        if (/\.coffee$/i.test(file)) {
            try {
                scriptCode = CoffeeScript.compile(scriptCode);
            } catch (e) {
                this.processScriptError(e, file, onError);
            }
        }
        // trick to locate source file location on error
        scriptCode += ";var __fe__ = new Error('__sourceId__')";
        scriptCode += ";__fe__.fileName = '" + file + "'";
        scriptCode += ";throw __fe__;";
        return scriptCode;
    };

    phantom.processScriptError = function(error, file, callback) {
        if (!this.sourceIds.hasOwnProperty(error.sourceId)) {
            this.sourceIds[error.sourceId] = file;
        }
        if (error.message === "__sourceId__") {
            return;
        }
        if (typeof callback === "function") {
            callback(error, file);
        } else {
            console.error(this.getErrorMessage(error));
            this.exit(1);
        }
    };

    // Patching require()
    // Inspired by phantomjs-nodify: https://github.com/jgonera/phantomjs-nodify/
    // TODO: remove when PhantomJS has full module support
    require = (function(require, requireDir) {
        var phantomBuiltins = ['fs', 'webpage', 'webserver'];
        var phantomRequire = phantom.__orig__require = require;
        var requireCache = {};
        return function(path) {
            var i, dir, paths = [],
                fileGuesses = [],
                file,
                module = {
                    exports: {}
                };
            if (phantomBuiltins.indexOf(path) !== -1) {
                return phantomRequire(path);
            } else {
                if (path[0] === '.') {
                    paths.push(fs.absolute(fs.pathJoin(requireDir, path)));
                } else if (path[0] === '/') {
                    paths.push(path);
                } else {
                    dir = fs.absolute(requireDir);
                    while (dir !== '') {
                        // 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(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;
                }
                try {
                    var scriptCode = phantom.getScriptCode(file);
                    new Function('module', 'exports', scriptCode)(module, module.exports);
                } catch (e) {
                    phantom.processScriptError(e, file);
                }
                requireCache[file] = module;
                return module.exports;
            }
        };
    })(require, phantom.casperPath);

    // Adding stack traces to Error
    // Inspired by phantomjs-nodify: https://github.com/jgonera/phantomjs-nodify/
    // TODO: remove when phantomjs has js engine upgrade
    if (!new Error().hasOwnProperty('stack')) {
        Object.defineProperty(Error.prototype, 'stack', {
            set: function(string) {
                this._stack = string;
            },
            get: function() {
                var location;
                if (this._stack) {
                    return this._stack;
                } else if (this.fileName || this.sourceId) {
                    location = phantom.getErrorMessage(this);
                } else {
                    location  = "unknown";
                }
                var from = this.caller || "anonymous";
                return this.toString() + '\n    ' + from + ' at ' + location;
            },
            configurable: true,
            enumerable: true
        });
    }

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

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

    // loaded status
    phantom.casperLoaded = true;
}

if (!!phantom.casperArgs.options.version) {
    console.log(phantom.casperVersion.toString());
    phantom.exit(0);
} else if (phantom.casperArgs.args.length === 0 || !!phantom.casperArgs.options.help) {
    var phantomVersion = [phantom.version.major, phantom.version.minor, phantom.version.patch].join('.');
    console.log('CasperJS version ' + phantom.casperVersion.toString() + ' at ' + phantom.casperPath);
    console.log('Using PhantomJS version ' + phantomVersion);
    console.log('Usage: casperjs script.(js|coffee) [options...]');
    console.log('Read the docs http://n1k0.github.com/casperjs/');
    phantom.exit(0);
}

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.args = phantom.casperArgs.args.filter(function(arg) {
    return arg !== phantom.casperScript;
});

// passed casperjs script execution
try {
    new Function(phantom.getScriptCode(phantom.casperScript))();
} catch (e) {
    phantom.processScriptError(e, phantom.casperScript);
}