/*!
 * 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 process, console, phantom, slimer, require:true*/
/*jshint maxstatements:34, maxcomplexity:10*/

// node check
if ('process' in this && process.title === "node") {
    console.error('CasperJS cannot be executed within a nodejs environment');
    process.exit(1);
}

// phantom check
if (!('phantom' in this)) {
    console.error('CasperJS needs to be executed in a PhantomJS environment http://phantomjs.org/');
}

// Common polyfills
if (typeof Function.prototype.bind !== "function") {
    Function.prototype.bind = function(scope) {
        "use strict";
        var _function = this;
        return function() {
            return _function.apply(scope, arguments);
        };
    };
}

// Custom base error
var CasperError = function CasperError(msg) {
    "use strict";
    Error.call(this);
    this.message = msg;
    this.name = 'CasperError';
};
CasperError.prototype = Object.getPrototypeOf(new Error());

// casperjs env initialization
(function(global, phantom){
    "use strict";
    // phantom args
    // NOTE: we can't use require('system').args here for some very obscure reason
    //       do not even attempt at using it as it creates infinite recursion
    var phantomArgs = phantom.args;

    if (phantom.casperLoaded) {
        return;
    }

    function __die(message) {
        if (message) {
            console.error(message);
        }
        phantom.exit(1);
    }

    function __terminate(message) {
        if (message) {
            console.log(message);
        }
        phantom.exit();
    }

    (function(version) {
        // required version check
        if (version.major !== 1) {
            return __die('CasperJS needs PhantomJS v1.x');
        } if (version.minor < 8) {
            return __die('CasperJS needs at least PhantomJS v1.8 or later.');
        }
        if (version.minor === 8 && version.patch < 1) {
            return __die('CasperJS needs at least PhantomJS v1.8.1 or later.');
        }
    })(phantom.version);

    // Hooks in default phantomjs error handler
    phantom.onError = function onPhantomError(msg, trace) {
        phantom.defaultErrorHandler.apply(phantom, arguments);
        // print a hint when a possible casperjs command misuse is detected
        if (msg.indexOf("ReferenceError: Can't find variable: casper") === 0) {
            console.error('Hint: you may want to use the `casperjs test` command.');
        }
        // exits on syntax error
        if (msg.indexOf('SyntaxError: Parse error') === 0) {
            __die();
        }
    };

    // Patching fs
    var fs = (function patchFs(fs) {
        if (!fs.hasOwnProperty('basename')) {
            fs.basename = function basename(path) {
                return path.replace(/.*\//, '');
            };
        }
        if (!fs.hasOwnProperty('dirname')) {
            fs.dirname = function dirname(path) {
                if (!path) return undefined;
                return path.toString().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('joinPath')) {
            fs.pathJoin = fs.joinPath;
        } else if (!fs.hasOwnProperty('pathJoin')) {
            fs.pathJoin = function pathJoin() {
                return Array.prototype.join.call(arguments, '/');
            };
        }
        return fs;
    })(require('fs'));

    // CasperJS root path
    if (!phantom.casperPath) {
        try {
            phantom.casperPath = phantom.args.map(function _map(arg) {
                var match = arg.match(/^--casper-path=(.*)/);
                if (match) {
                    return fs.absolute(match[1]);
                }
            }).filter(function _filter(path) {
                return fs.isDirectory(path);
            }).pop();
        } catch (e) {
            return __die("Couldn't find nor compute phantom.casperPath, exiting.");
        }
    }

    /**
     * Prints CasperJS help.
     */
    function printHelp() {
        var engine = phantom.casperEngine === 'slimerjs' ? slimer : phantom;
        var version = [engine.version.major, engine.version.minor, engine.version.patch].join('.');
        return __terminate([
            'CasperJS version ' + phantom.casperVersion.toString() +
            ' at ' + phantom.casperPath + ', using ' + phantom.casperEngine + ' version ' + version,
            fs.read(fs.pathJoin(phantom.casperPath, 'bin', 'usage.txt'))
        ].join('\n'))
    }

    /**
     * Patched require to allow loading of native casperjs modules.
     * Every casperjs module have to first call this function in order to
     * load a native casperjs module:
     *
     *     var require = patchRequire(require);
     *     var utils = require('utils');
     *
     * Useless for SlimerJS
     */
    function patchRequire(require) {
        if (require.patched) {
            return require;
        }
        function fromPackageJson(module, dir) {
            var pkgPath, pkgContents, pkg;
            pkgPath = fs.pathJoin(dir, module, 'package.json');
            if (!fs.exists(pkgPath)) {
                return;
            }
            pkgContents = fs.read(pkgPath);
            if (!pkgContents) {
                return;
            }
            try {
                pkg = JSON.parse(pkgContents);
            } catch (e) {
                return;
            }
            if (typeof pkg === "object" && pkg.main) {
                return fs.absolute(fs.pathJoin(dir, module, pkg.main));
            }
        }
        function resolveFile(path, dir) {
            var extensions = ['js', 'coffee', 'json'];
            var basenames = [path, path + '/index'];
            var paths = [];
            var nodejsScript = fromPackageJson(path, dir);
            if (nodejsScript) {
                return nodejsScript;
            }
            basenames.forEach(function(basename) {
                paths.push(fs.absolute(fs.pathJoin(dir, basename)));
                extensions.forEach(function(extension) {
                    paths.push(fs.absolute(fs.pathJoin(dir, [basename, extension].join('.'))));
                });
            });
            for (var i = 0; i < paths.length; i++) {
                if (fs.isFile(paths[i])) {
                    return paths[i];
                }
            }
            return null;
        }
        function getCurrentScriptRoot() {
            if ((phantom.casperScriptBaseDir || "").indexOf(fs.workingDirectory) === 0) {
                return phantom.casperScriptBaseDir;
            }
            return fs.absolute(fs.pathJoin(fs.workingDirectory, phantom.casperScriptBaseDir));
        }
        function casperBuiltinPath(path) {
            return resolveFile(path, fs.pathJoin(phantom.casperPath, 'modules'));
        }
        function nodeModulePath(path) {
            return resolveFile(path, fs.pathJoin(getCurrentScriptRoot(), 'node_modules'));
        }
        function localModulePath(path) {
            return resolveFile(path, phantom.casperScriptBaseDir || fs.workingDirectory);
        }
        var patchedRequire = function patchedRequire(path) {
            try {
                return require(casperBuiltinPath(path) ||
                               nodeModulePath(path)    ||
                               localModulePath(path)   ||
                               path);
            } catch (e) {
                throw new CasperError("Can't find module " + path);
            }
        };
        patchedRequire.cache = require.cache;
        patchedRequire.extensions = require.extensions;
        patchedRequire.stubs = require.stubs;
        patchedRequire.patched = true;
        return patchedRequire;
    }

    /**
     * Initializes the CasperJS Command Line Interface.
     */
    function initCasperCli(casperArgs) {
        /* jshint maxcomplexity:99 */
        var baseTestsPath = fs.pathJoin(phantom.casperPath, 'tests');

        function setScriptBaseDir(scriptName) {
            var dir = fs.dirname(scriptName);
            if (dir === scriptName) {
                dir = '.';
            }
            phantom.casperScriptBaseDir = dir;
        }

        if (!!casperArgs.options.version) {
            return __terminate(phantom.casperVersion.toString())
        } else if (casperArgs.get(0) === "test") {
            phantom.casperScript = fs.absolute(fs.pathJoin(baseTestsPath, 'run.js'));
            phantom.casperTest = true;
            casperArgs.drop("test");
            setScriptBaseDir(casperArgs.get(0));
        } else if (casperArgs.get(0) === "selftest") {
            phantom.casperScript = fs.absolute(fs.pathJoin(baseTestsPath, 'run.js'));
            phantom.casperSelfTest = phantom.casperTest = true;
            casperArgs.options.includes = fs.pathJoin(baseTestsPath, 'selftest.js');
            if (casperArgs.args.length <= 1) {
                casperArgs.args.push(fs.pathJoin(baseTestsPath, 'suites'));
            }
            casperArgs.drop("selftest");
            phantom.casperScriptBaseDir = fs.dirname(casperArgs.get(1) || fs.dirname(phantom.casperScript));
        } else if (casperArgs.args.length === 0 || !!casperArgs.options.help) {
            return printHelp();
        }

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

        if (!fs.isFile(phantom.casperScript)) {
            return __die('Unable to open file: ' + phantom.casperScript);
        }

        if (!phantom.casperScriptBaseDir) {
            setScriptBaseDir(phantom.casperScript);
        }

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

    // CasperJS version, extracted from package.json - see http://semver.org/
    phantom.casperVersion = (function getCasperVersion(path) {
        var parts, patchPart, pkg, pkgFile;
        pkgFile = fs.absolute(fs.pathJoin(path, 'package.json'));
        if (!fs.exists(pkgFile)) {
            throw new CasperError('Cannot find package.json at ' + pkgFile);
        }
        try {
            pkg = JSON.parse(require('fs').read(pkgFile));
        } catch (e) {
            throw new CasperError('Cannot read package file contents: ' + e);
        }
        parts  = pkg.version.trim().split(".");
        if (parts.length < 3) {
            throw new 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);

    if ("slimer" in global) {
        // for SlimerJS, use the standard API to declare directories
        // where to search modules
        require.paths.push(fs.pathJoin(phantom.casperPath, 'modules'));
        require.paths.push(fs.workingDirectory);

        // declare a dummy patchRequire function
        require.globals.patchRequire = global.patchRequire = function(req) { return req;};
        require.globals.CasperError = CasperError;
        phantom.casperEngine = "slimerjs";
    }
    else {
        // patch require
        global.__require = require;
        global.patchRequire = patchRequire; // must be called in every casperjs module as of 1.1
        global.require = patchRequire(global.require);
        phantom.casperEngine = "phantomjs";
    }

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

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

    if ("slimer" in global && phantom.casperScriptBaseDir) {
        // initCasperCli has set casperScriptBaseDir
        // use it instead of fs.workingDirectory
        require.paths.pop();
        require.paths.push(phantom.casperScriptBaseDir);
    }

    // casper loading status flag
    phantom.casperLoaded = true;

    // passed casperjs script execution
    if (phantom.casperScript && !phantom.injectJs(phantom.casperScript)) {
        return __die('Unable to load script ' + phantom.casperScript + '; check file syntax');
    }
})(this, phantom);