/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Ajax.org Code Editor (ACE).
 *
 * The Initial Developer of the Original Code is
 * Ajax.org B.V.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *      Fabian Jakobs <fabian AT ajax DOT org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

define(function(require, exports, module) {

var keys = require("./keys");
var useragent = require("./useragent");
var dom = require("./dom");

exports.addListener = function(elem, type, callback) {
    if (elem.addEventListener) {
        return elem.addEventListener(type, callback, false);
    }
    if (elem.attachEvent) {
        var wrapper = function() {
            callback(window.event);
        };
        callback._wrapper = wrapper;
        elem.attachEvent("on" + type, wrapper);
    }
};

exports.removeListener = function(elem, type, callback) {
    if (elem.removeEventListener) {
        return elem.removeEventListener(type, callback, false);
    }
    if (elem.detachEvent) {
        elem.detachEvent("on" + type, callback._wrapper || callback);
    }
};

/**
* Prevents propagation and clobbers the default action of the passed event
*/
exports.stopEvent = function(e) {
    exports.stopPropagation(e);
    exports.preventDefault(e);
    return false;
};

exports.stopPropagation = function(e) {
    if (e.stopPropagation)
        e.stopPropagation();
    else
        e.cancelBubble = true;
};

exports.preventDefault = function(e) {
    if (e.preventDefault)
        e.preventDefault();
    else
        e.returnValue = false;
};

exports.getDocumentX = function(e) {
    if (e.clientX) {
        return e.clientX + dom.getPageScrollLeft();
    } else {
        return e.pageX;
    }
};

exports.getDocumentY = function(e) {
    if (e.clientY) {
        return e.clientY + dom.getPageScrollTop();
    } else {
        return e.pageY;
    }
};

/**
 * @return {Number} 0 for left button, 1 for middle button, 2 for right button
 */
exports.getButton = function(e) {
    if (e.type == "dblclick")
        return 0;
    else if (e.type == "contextmenu")
        return 2;

    // DOM Event
    if (e.preventDefault) {
        return e.button;
    }
    // old IE
    else {
        return {1:0, 2:2, 4:1}[e.button];
    }
};

if (document.documentElement.setCapture) {
    exports.capture = function(el, eventHandler, releaseCaptureHandler) {
        function onMouseMove(e) {
            eventHandler(e);
            return exports.stopPropagation(e);
        }

        var called = false;
        function onReleaseCapture(e) {
            eventHandler(e);

            if (!called) {
                called = true;
                releaseCaptureHandler(e);
            }

            exports.removeListener(el, "mousemove", eventHandler);
            exports.removeListener(el, "mouseup", onReleaseCapture);
            exports.removeListener(el, "losecapture", onReleaseCapture);

            el.releaseCapture();
        }

        exports.addListener(el, "mousemove", eventHandler);
        exports.addListener(el, "mouseup", onReleaseCapture);
        exports.addListener(el, "losecapture", onReleaseCapture);
        el.setCapture();
    };
}
else {
    exports.capture = function(el, eventHandler, releaseCaptureHandler) {
        function onMouseMove(e) {
            eventHandler(e);
            e.stopPropagation();
        }

        function onMouseUp(e) {
            eventHandler && eventHandler(e);
            releaseCaptureHandler && releaseCaptureHandler(e);

            document.removeEventListener("mousemove", onMouseMove, true);
            document.removeEventListener("mouseup", onMouseUp, true);

            e.stopPropagation();
        }

        document.addEventListener("mousemove", onMouseMove, true);
        document.addEventListener("mouseup", onMouseUp, true);
    };
}

exports.addMouseWheelListener = function(el, callback) {
    var max = 0;
    var listener = function(e) {
        if (e.wheelDelta !== undefined) {

            // some versions of Safari (e.g. 5.0.5) report insanely high
            // scroll values. These browsers require a higher factor
            if (Math.abs(e.wheelDeltaY) > max)
                max = Math.abs(e.wheelDeltaY)

            if (max > 5000)
                factor = 400;
            else
                factor = 8;

            if (e.wheelDeltaX !== undefined) {
                e.wheelX = -e.wheelDeltaX / factor;
                e.wheelY = -e.wheelDeltaY / factor;
            } else {
                e.wheelX = 0;
                e.wheelY = -e.wheelDelta / factor;
            }
        }
        else {
            if (e.axis && e.axis == e.HORIZONTAL_AXIS) {
                e.wheelX = (e.detail || 0) * 5;
                e.wheelY = 0;
            } else {
                e.wheelX = 0;
                e.wheelY = (e.detail || 0) * 5;
            }
        }
        callback(e);
    };
    exports.addListener(el, "DOMMouseScroll", listener);
    exports.addListener(el, "mousewheel", listener);
};

exports.addMultiMouseDownListener = function(el, button, count, timeout, callback) {
    var clicks = 0;
    var startX, startY;

    var listener = function(e) {
        clicks += 1;
        if (clicks == 1) {
            startX = e.clientX;
            startY = e.clientY;

            setTimeout(function() {
                clicks = 0;
            }, timeout || 600);
        }

        var isButton = exports.getButton(e) == button;
        if (!isButton || Math.abs(e.clientX - startX) > 5 || Math.abs(e.clientY - startY) > 5)
            clicks = 0;

        if (clicks == count) {
            clicks = 0;
            callback(e);
        }

        if (isButton)
            return exports.preventDefault(e);
    };

    exports.addListener(el, "mousedown", listener);
    useragent.isOldIE && exports.addListener(el, "dblclick", listener);
};

function normalizeCommandKeys(callback, e, keyCode) {
    var hashId = 0;
    if (useragent.isOpera && useragent.isMac) {
        hashId = 0 | (e.metaKey ? 1 : 0) | (e.altKey ? 2 : 0)
            | (e.shiftKey ? 4 : 0) | (e.ctrlKey ? 8 : 0);
    } else {
        hashId = 0 | (e.ctrlKey ? 1 : 0) | (e.altKey ? 2 : 0)
            | (e.shiftKey ? 4 : 0) | (e.metaKey ? 8 : 0);
    }

    if (keyCode in keys.MODIFIER_KEYS) {
        switch (keys.MODIFIER_KEYS[keyCode]) {
            case "Alt":
                hashId = 2;
                break;
            case "Shift":
                hashId = 4;
                break
            case "Ctrl":
                hashId = 1;
                break;
            default:
                hashId = 8;
                break;
        }
        keyCode = 0;
    }

    if (hashId & 8 && (keyCode == 91 || keyCode == 93)) {
        keyCode = 0;
    }

    // If there is no hashID and the keyCode is not a function key, then
    // we don't call the callback as we don't handle a command key here
    // (it's a normal key/character input).
    if (!(keyCode in keys.FUNCTION_KEYS) && !(keyCode in keys.PRINTABLE_KEYS)) {
        return false;
    }
    return callback(e, hashId, keyCode);
}

exports.addCommandKeyListener = function(el, callback) {
    var addListener = exports.addListener;
    if (useragent.isOldGecko) {
        // Old versions of Gecko aka. Firefox < 4.0 didn't repeat the keydown
        // event if the user pressed the key for a longer time. Instead, the
        // keydown event was fired once and later on only the keypress event.
        // To emulate the 'right' keydown behavior, the keyCode of the initial
        // keyDown event is stored and in the following keypress events the
        // stores keyCode is used to emulate a keyDown event.
        var lastKeyDownKeyCode = null;
        addListener(el, "keydown", function(e) {
            lastKeyDownKeyCode = e.keyCode;
        });
        addListener(el, "keypress", function(e) {
            return normalizeCommandKeys(callback, e, lastKeyDownKeyCode);
        });
    } else {
        var lastDown = null;

        addListener(el, "keydown", function(e) {
            lastDown = e.keyIdentifier || e.keyCode;
            return normalizeCommandKeys(callback, e, e.keyCode);
        });

        // repeated keys are fired as keypress and not keydown events
        if (useragent.isMac && useragent.isOpera) {
            addListener(el, "keypress", function(e) {
                var keyId = e.keyIdentifier || e.keyCode;
                if (lastDown !== keyId) {
                    return normalizeCommandKeys(callback, e, lastDown);
                } else {
                    lastDown = null;
                }
            });
        }
    }
};

});
