/* ***** BEGIN LICENSE BLOCK *****
 * Distributed under the BSD license:
 *
 * Copyright (c) 2010, Ajax.org B.V.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Ajax.org B.V. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 AJAX.ORG B.V. 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.
 *
 * ***** END LICENSE BLOCK ***** */

define(function(require, exports, module) {
"no use strict";

var lang = require("./lib/lang");
var oop = require("./lib/oop");
var net = require("./lib/net");
var EventEmitter = require("./lib/event_emitter").EventEmitter;

var global = (function() {
    return this;
})();

var options = {
    packaged: false,
    workerPath: null,
    modePath: null,
    themePath: null,
    basePath: "",
    suffix: ".js",
    $moduleUrls: {}
};

exports.get = function(key) {
    if (!options.hasOwnProperty(key))
        throw new Error("Unknown config key: " + key);

    return options[key];
};

exports.set = function(key, value) {
    if (!options.hasOwnProperty(key))
        throw new Error("Unknown config key: " + key);

    options[key] = value;
};

exports.all = function() {
    return lang.copyObject(options);
};

// module loading
oop.implement(exports, EventEmitter);

exports.moduleUrl = function(name, component) {
    if (options.$moduleUrls[name])
        return options.$moduleUrls[name];

    var parts = name.split("/");
    component = component || parts[parts.length - 2] || "";
    
    // todo make this configurable or get rid of '-'
    var sep = component == "snippets" ? "/" : "-";
    var base = parts[parts.length - 1];    
    if (sep == "-") {
        var re = new RegExp("^" + component + "[\-_]|[\-_]" + component + "$", "g");
        base = base.replace(re, "");
    }

    if ((!base || base == component) && parts.length > 1)
        base = parts[parts.length - 2];
    var path = options[component + "Path"];
    if (path == null) {
        path = options.basePath;
    } else if (sep == "/") {
        component = sep = "";
    }
    if (path && path.slice(-1) != "/")
        path += "/";
    return path + component + sep + base + this.get("suffix");
};

exports.setModuleUrl = function(name, subst) {
    return options.$moduleUrls[name] = subst;
};

exports.$loading = {};
exports.loadModule = function(moduleName, onLoad) {
    var module, moduleType;
    if (Array.isArray(moduleName)) {
        moduleType = moduleName[0];
        moduleName = moduleName[1];
    }

    try {
        module = require(moduleName);
    } catch (e) {};
    // require(moduleName) can return empty object if called after require([moduleName], callback)
    if (module && !exports.$loading[moduleName])
        return onLoad && onLoad(module);

    if (!exports.$loading[moduleName])
        exports.$loading[moduleName] = [];

    exports.$loading[moduleName].push(onLoad);

    if (exports.$loading[moduleName].length > 1)
        return;

    var afterLoad = function() {
        require([moduleName], function(module) {
            exports._emit("load.module", {name: moduleName, module: module});
            var listeners = exports.$loading[moduleName];
            exports.$loading[moduleName] = null;
            listeners.forEach(function(onLoad) {
                onLoad && onLoad(module);
            });
        });
    };

    if (!exports.get("packaged"))
        return afterLoad();
    net.loadScript(exports.moduleUrl(moduleName, moduleType), afterLoad);
};


// initialization
exports.init = function() {
    options.packaged = require.packaged || module.packaged || (global.define && define.packaged);

    if (!global.document)
        return "";

    var scriptOptions = {};
    var scriptUrl = "";

    var scripts = document.getElementsByTagName("script");
    for (var i=0; i<scripts.length; i++) {
        var script = scripts[i];

        var src = script.src || script.getAttribute("src");
        if (!src)
            continue;

        var attributes = script.attributes;
        for (var j=0, l=attributes.length; j < l; j++) {
            var attr = attributes[j];
            if (attr.name.indexOf("data-ace-") === 0) {
                scriptOptions[deHyphenate(attr.name.replace(/^data-ace-/, ""))] = attr.value;
            }
        }

        var m = src.match(/^(.*)\/ace(\-\w+)?\.js(\?|$)/);
        if (m)
            scriptUrl = m[1];
    }

    if (scriptUrl) {
        scriptOptions.base = scriptOptions.base || scriptUrl;
        scriptOptions.packaged = true;
    }

    scriptOptions.basePath = scriptOptions.base;
    scriptOptions.workerPath = scriptOptions.workerPath || scriptOptions.base;
    scriptOptions.modePath = scriptOptions.modePath || scriptOptions.base;
    scriptOptions.themePath = scriptOptions.themePath || scriptOptions.base;
    delete scriptOptions.base;

    for (var key in scriptOptions)
        if (typeof scriptOptions[key] !== "undefined")
            exports.set(key, scriptOptions[key]);
};

function deHyphenate(str) {
    return str.replace(/-(.)/g, function(m, m1) { return m1.toUpperCase(); });
}

var optionsProvider = {
    setOptions: function(optList) {
        Object.keys(optList).forEach(function(key) {
            this.setOption(key, optList[key]);
        }, this);
    },
    getOptions: function(optionNames) {
        var result = {};
        if (!optionNames) {
            optionNames = Object.keys(this.$options);
        } else if (!Array.isArray(optionNames)) {
            result = optionNames;
            optionNames = Object.keys(result);
        }
        optionNames.forEach(function(key) {
            result[key] = this.getOption(key);
        }, this);
        return result;
    },
    setOption: function(name, value) {
        if (this["$" + name] === value)
            return;
        var opt = this.$options[name];
        if (!opt)
            return undefined;
        if (opt.forwardTo)
            return this[opt.forwardTo] && this[opt.forwardTo].setOption(name, value);

        if (!opt.handlesSet)
            this["$" + name] = value;
        if (opt && opt.set)
            opt.set.call(this, value);
    },
    getOption: function(name) {
        var opt = this.$options[name];
        if (!opt)
            return undefined;
        if (opt.forwardTo)
            return this[opt.forwardTo] && this[opt.forwardTo].getOption(name);
        return opt && opt.get ? opt.get.call(this) : this["$" + name];
    }
};

var defaultOptions = {};
/*
 * option {name, value, initialValue, setterName, set, get }
 */
exports.defineOptions = function(obj, path, options) {
    if (!obj.$options)
        defaultOptions[path] = obj.$options = {};

    Object.keys(options).forEach(function(key) {
        var opt = options[key];
        if (typeof opt == "string")
            opt = {forwardTo: opt};

        opt.name || (opt.name = key);
        obj.$options[opt.name] = opt;
        if ("initialValue" in opt)
            obj["$" + opt.name] = opt.initialValue;
    });

    // implement option provider interface
    oop.implement(obj, optionsProvider);

    return this;
};

exports.resetOptions = function(obj) {
    Object.keys(obj.$options).forEach(function(key) {
        var opt = obj.$options[key];
        if ("value" in opt)
            obj.setOption(key, opt.value);
    });
};

exports.setDefaultValue = function(path, name, value) {
    var opts = defaultOptions[path] || (defaultOptions[path] = {});
    if (opts[name]) {
        if (opts.forwardTo)
            exports.setDefaultValue(opts.forwardTo, name, value)
        else
            opts[name].value = value;
    }
};

exports.setDefaultValues = function(path, optionHash) {
    Object.keys(optionHash).forEach(function(key) {
        exports.setDefaultValue(path, key, optionHash[key]);
    });
};

});
