/* ***** 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) {
"use strict";

var event = require("../lib/event");
var useragent = require("../lib/useragent");
var dom = require("../lib/dom");
var lang = require("../lib/lang");
var BROKEN_SETDATA = useragent.isChrome < 18;

var TextInput = function(parentNode, host) {
    var text = dom.createElement("textarea");
    text.className = "ace_text-input";

    if (useragent.isTouchPad)
        text.setAttribute("x-palm-disable-auto-cap", true);

    text.wrap = "off";
    text.autocorrect = "off";
    text.autocapitalize = "off";
    text.spellcheck = false;

    text.style.opacity = "0";
    parentNode.insertBefore(text, parentNode.firstChild);

    var PLACEHOLDER = "\x01\x01";

    var cut = false;
    var copied = false;
    var pasted = false;
    var inComposition = false;
    var tempStyle = '';
    var isSelectionEmpty = true;

    // FOCUS
    // ie9 throws error if document.activeElement is accessed too soon
    try { var isFocused = document.activeElement === text; } catch(e) {}
    
    event.addListener(text, "blur", function() {
        host.onBlur();
        isFocused = false;
    });
    event.addListener(text, "focus", function() {
        isFocused = true;
        host.onFocus();
        resetSelection();
    });
    this.focus = function() { text.focus(); };
    this.blur = function() { text.blur(); };
    this.isFocused = function() {
        return isFocused;
    };

    // modifying selection of blured textarea can focus it (chrome mac/linux)
    var syncSelection = lang.delayedCall(function() {
        isFocused && resetSelection(isSelectionEmpty);
    });
    var syncValue = lang.delayedCall(function() {
         if (!inComposition) {
            text.value = PLACEHOLDER;
            isFocused && resetSelection();
         }
    });

    function resetSelection(isEmpty) {
        if (inComposition)
            return;
        if (inputHandler) {
            selectionStart = 0;
            selectionEnd = isEmpty ? 0 : text.value.length - 1;
        } else {
            var selectionStart = isEmpty ? 2 : 1;
            var selectionEnd = 2;
        }
        // on firefox this throws if textarea is hidden
        try {
            text.setSelectionRange(selectionStart, selectionEnd);
        } catch(e){}
    }

    function resetValue() {
        if (inComposition)
            return;
        text.value = PLACEHOLDER;
        //http://code.google.com/p/chromium/issues/detail?id=76516
        if (useragent.isWebKit)
            syncValue.schedule();
    }

    useragent.isWebKit || host.addEventListener('changeSelection', function() {
        if (host.selection.isEmpty() != isSelectionEmpty) {
            isSelectionEmpty = !isSelectionEmpty;
            syncSelection.schedule();
        }
    });

    resetValue();
    if (isFocused)
        host.onFocus();


    var isAllSelected = function(text) {
        return text.selectionStart === 0 && text.selectionEnd === text.value.length;
    };
    // IE8 does not support setSelectionRange
    if (!text.setSelectionRange && text.createTextRange) {
        text.setSelectionRange = function(selectionStart, selectionEnd) {
            var range = this.createTextRange();
            range.collapse(true);
            range.moveStart('character', selectionStart);
            range.moveEnd('character', selectionEnd);
            range.select();
        };
        isAllSelected = function(text) {
            try {
                var range = text.ownerDocument.selection.createRange();
            }catch(e) {}
            if (!range || range.parentElement() != text) return false;
                return range.text == text.value;
        }
    }
    if (useragent.isOldIE) {
        var inPropertyChange = false;
        var onPropertyChange = function(e){
            if (inPropertyChange)
                return;
            var data = text.value;
            if (inComposition || !data || data == PLACEHOLDER)
                return;
            // can happen either after delete or during insert operation
            if (e && data == PLACEHOLDER[0])
                return syncProperty.schedule();

            sendText(data);
            // ie8 calls propertychange handlers synchronously!
            inPropertyChange = true;
            resetValue();
            inPropertyChange = false;
        };
        var syncProperty = lang.delayedCall(onPropertyChange);
        event.addListener(text, "propertychange", onPropertyChange);

        var keytable = { 13:1, 27:1 };
        event.addListener(text, "keyup", function (e) {
            if (inComposition && (!text.value || keytable[e.keyCode]))
                setTimeout(onCompositionEnd, 0);
            if ((text.value.charCodeAt(0)||0) < 129) {
                return syncProperty.call();
            }
            inComposition ? onCompositionUpdate() : onCompositionStart();
        });
        // when user presses backspace after focusing the editor 
        // propertychange isn't called for the next character
        event.addListener(text, "keydown", function (e) {
            syncProperty.schedule(50);
        });
    }

    var onSelect = function(e) {
        if (cut) {
            cut = false;
        } else if (copied) {
            copied = false;
        } else if (isAllSelected(text)) {
            host.selectAll();
            resetSelection();
        } else if (inputHandler) {
            resetSelection(host.selection.isEmpty());
        }
    };

    var inputHandler = null;
    this.setInputHandler = function(cb) {inputHandler = cb};
    this.getInputHandler = function() {return inputHandler};
    var afterContextMenu = false;
    
    var sendText = function(data) {
        if (inputHandler) {
            data = inputHandler(data);
            inputHandler = null;
        }
        if (pasted) {
            resetSelection();
            if (data)
                host.onPaste(data);
            pasted = false;
        } else if (data == PLACEHOLDER.charAt(0)) {
            if (afterContextMenu)
                host.execCommand("del", {source: "ace"});
            else // some versions of android do not fire keydown when pressing backspace
                host.execCommand("backspace", {source: "ace"});
        } else {
            if (data.substring(0, 2) == PLACEHOLDER)
                data = data.substr(2);
            else if (data.charAt(0) == PLACEHOLDER.charAt(0))
                data = data.substr(1);
            else if (data.charAt(data.length - 1) == PLACEHOLDER.charAt(0))
                data = data.slice(0, -1);
            // can happen if undo in textarea isn't stopped
            if (data.charAt(data.length - 1) == PLACEHOLDER.charAt(0))
                data = data.slice(0, -1);
            
            if (data)
                host.onTextInput(data);
        }
        if (afterContextMenu)
            afterContextMenu = false;
    };
    var onInput = function(e) {
        // console.log("onInput", inComposition)
        if (inComposition)
            return;
        var data = text.value;
        sendText(data);
        resetValue();
    };

    var onCut = function(e) {
        var data = host.getCopyText();
        if (!data) {
            event.preventDefault(e);
            return;
        }

        var clipboardData = e.clipboardData || window.clipboardData;

        if (clipboardData && !BROKEN_SETDATA) {
            // Safari 5 has clipboardData object, but does not handle setData()
            var supported = clipboardData.setData("Text", data);
            if (supported) {
                host.onCut();
                event.preventDefault(e);
            }
        }

        if (!supported) {
            cut = true;
            text.value = data;
            text.select();
            setTimeout(function(){
                cut = false;
                resetValue();
                resetSelection();
                host.onCut();
            });
        }
    };

    var onCopy = function(e) {
        var data = host.getCopyText();
        if (!data) {
            event.preventDefault(e);
            return;
        }

        var clipboardData = e.clipboardData || window.clipboardData;
        if (clipboardData && !BROKEN_SETDATA) {
            // Safari 5 has clipboardData object, but does not handle setData()
            var supported = clipboardData.setData("Text", data);
            if (supported) {
                host.onCopy();
                event.preventDefault(e);
            }
        }
        if (!supported) {
            copied = true;
            text.value = data;
            text.select();
            setTimeout(function(){
                copied = false;
                resetValue();
                resetSelection();
                host.onCopy();
            });
        }
    };

    var onPaste = function(e) {
        var clipboardData = e.clipboardData || window.clipboardData;

        if (clipboardData) {
            var data = clipboardData.getData("Text");
            if (data)
                host.onPaste(data);
            if (useragent.isIE)
                setTimeout(resetSelection);
            event.preventDefault(e);
        }
        else {
            text.value = "";
            pasted = true;
        }
    };

    event.addCommandKeyListener(text, host.onCommandKey.bind(host));

    event.addListener(text, "select", onSelect);

    event.addListener(text, "input", onInput);

    event.addListener(text, "cut", onCut);
    event.addListener(text, "copy", onCopy);
    event.addListener(text, "paste", onPaste);


    // Opera has no clipboard events
    if (!('oncut' in text) || !('oncopy' in text) || !('onpaste' in text)){
        event.addListener(parentNode, "keydown", function(e) {
            if ((useragent.isMac && !e.metaKey) || !e.ctrlKey)
            return;

            switch (e.keyCode) {
                case 67:
                    onCopy(e);
                    break;
                case 86:
                    onPaste(e);
                    break;
                case 88:
                    onCut(e);
                    break;
            }
        });
    }


    // COMPOSITION
    var onCompositionStart = function(e) {
        if (inComposition) return;
        // console.log("onCompositionStart", inComposition)
        inComposition = {};
        host.onCompositionStart();
        setTimeout(onCompositionUpdate, 0);
        host.on("mousedown", onCompositionEnd);
        if (!host.selection.isEmpty()) {
            host.insert("");
            host.session.markUndoGroup();
            host.selection.clearSelection();
        }
        host.session.markUndoGroup();
    };

    var onCompositionUpdate = function() {
        // console.log("onCompositionUpdate", inComposition && JSON.stringify(text.value))
        if (!inComposition) return;
        var val = text.value.replace(/\x01/g, "");
        if (inComposition.lastValue === val) return;
        
        host.onCompositionUpdate(val);
        if (inComposition.lastValue)
            host.undo();
        inComposition.lastValue = val;
        if (inComposition.lastValue) {
            var r = host.selection.getRange();
            host.insert(inComposition.lastValue);
            host.session.markUndoGroup();
            inComposition.range = host.selection.getRange();
            host.selection.setRange(r);
            host.selection.clearSelection();
        }
    };

    var onCompositionEnd = function(e) {
        // console.log("onCompositionEnd", inComposition &&inComposition.lastValue)
        var c = inComposition;
        inComposition = false;
        var timer = setTimeout(function() {
            timer = null;
            var str = text.value.replace(/\x01/g, "");
            // console.log(str, c.lastValue)
            if (inComposition)
                return
            else if (str == c.lastValue)
                resetValue();
            else if (!c.lastValue && str) {
                resetValue();
                sendText(str);
            }
        });
        inputHandler = function compositionInputHandler(str) {
            // console.log("onCompositionEnd", str, c.lastValue)
            if (timer)
                clearTimeout(timer);
            str = str.replace(/\x01/g, "");
            if (str == c.lastValue)
                return "";
            if (c.lastValue && timer)
                host.undo();
            return str;
        };
        host.onCompositionEnd();
        host.removeListener("mousedown", onCompositionEnd);
        if (e.type == "compositionend" && c.range) {
            host.selection.setRange(c.range);
        }
    };
    
    

    var syncComposition = lang.delayedCall(onCompositionUpdate, 50);

    event.addListener(text, "compositionstart", onCompositionStart);
    if (useragent.isGecko) {
        event.addListener(text, "text", function(){syncComposition.schedule()});
    } else {
        event.addListener(text, "keyup", function(){syncComposition.schedule()});
        event.addListener(text, "keydown", function(){syncComposition.schedule()});
    }
    event.addListener(text, "compositionend", onCompositionEnd);

    this.getElement = function() {
        return text;
    };

    this.setReadOnly = function(readOnly) {
       text.readOnly = readOnly;
    };

    this.onContextMenu = function(e) {
        afterContextMenu = true;
        if (!tempStyle)
            tempStyle = text.style.cssText;

        text.style.cssText = "z-index:100000;" + (useragent.isIE ? "opacity:0.1;" : "");

        resetSelection(host.selection.isEmpty());
        host._emit("nativecontextmenu", {target: host, domEvent: e});
        var rect = host.container.getBoundingClientRect();
        var style = dom.computedStyle(host.container);
        var top = rect.top + (parseInt(style.borderTopWidth) || 0);
        var left = rect.left + (parseInt(rect.borderLeftWidth) || 0);
        var maxTop = rect.bottom - top - text.clientHeight;
        var move = function(e) {
            text.style.left = e.clientX - left - 2 + "px";
            text.style.top = Math.min(e.clientY - top - 2, maxTop) + "px";
        }; 
        move(e);

        if (e.type != "mousedown")
            return;

        if (host.renderer.$keepTextAreaAtCursor)
            host.renderer.$keepTextAreaAtCursor = null;

        // on windows context menu is opened after mouseup
        if (useragent.isWin)
            event.capture(host.container, move, onContextMenuClose);
    };

    this.onContextMenuClose = onContextMenuClose;
    function onContextMenuClose() {
        setTimeout(function () {
            if (tempStyle) {
                text.style.cssText = tempStyle;
                tempStyle = '';
            }
            if (host.renderer.$keepTextAreaAtCursor == null) {
                host.renderer.$keepTextAreaAtCursor = true;
                host.renderer.$moveTextAreaToCursor();
            }
        }, 0);
    }

    // firefox fires contextmenu event after opening it
    if (!useragent.isGecko || useragent.isMac) {
        var onContextMenu = function(e) {
            host.textInput.onContextMenu(e);
            onContextMenuClose();
        };
        event.addListener(host.renderer.scroller, "contextmenu", onContextMenu);
        event.addListener(text, "contextmenu", onContextMenu);
    }
};

exports.TextInput = TextInput;
});