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 * Copyright (c) 2010, Ajax.org B.V.
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define(function(require, exports, module) {
"use strict";

var dom = require("ace/lib/dom");
var oop = require("ace/lib/oop");
var event = require("ace/lib/event");
var Range = require("ace/range").Range;
var Tooltip = require("ace/tooltip").Tooltip;

function TokenTooltip (editor) {
    if (editor.tokenTooltip)
        return;
    Tooltip.call(this, editor.container);
    editor.tokenTooltip = this;
    this.editor = editor;

    this.update = this.update.bind(this);
    this.onMouseMove = this.onMouseMove.bind(this);
    this.onMouseOut = this.onMouseOut.bind(this);
    event.addListener(editor.renderer.scroller, "mousemove", this.onMouseMove);
    event.addListener(editor.renderer.content, "mouseout", this.onMouseOut);
}

oop.inherits(TokenTooltip, Tooltip);

(function(){
    this.token = {};
    this.range = new Range();
    
    this.update = function() {
        this.$timer = null;
        
        var r = this.editor.renderer;
        if (this.lastT - (r.timeStamp || 0) > 1000) {
            r.rect = null;
            r.timeStamp = this.lastT;
            this.maxHeight = window.innerHeight;
            this.maxWidth = window.innerWidth;
        }

        var canvasPos = r.rect || (r.rect = r.scroller.getBoundingClientRect());
        var offset = (this.x + r.scrollLeft - canvasPos.left - r.$padding) / r.characterWidth;
        var row = Math.floor((this.y + r.scrollTop - canvasPos.top) / r.lineHeight);
        var col = Math.round(offset);

        var screenPos = {row: row, column: col, side: offset - col > 0 ? 1 : -1};
        var session = this.editor.session;
        var docPos = session.screenToDocumentPosition(screenPos.row, screenPos.column);
        var token = session.getTokenAt(docPos.row, docPos.column);

        if (!token && !session.getLine(docPos.row)) {
            token = {
                type: "",
                value: "",
                state: session.bgTokenizer.getState(0)
            };
        }
        if (!token) {
            session.removeMarker(this.marker);
            this.hide();
            return;
        }

        var tokenText = token.type;
        if (token.state)
            tokenText += "|" + token.state;
        if (token.merge)
            tokenText += "\n  merge";
        if (token.stateTransitions)
            tokenText += "\n  " + token.stateTransitions.join("\n  ");

        if (this.tokenText != tokenText) {
            this.setText(tokenText);
            this.width = this.getWidth();
            this.height = this.getHeight();
            this.tokenText = tokenText;
        }

        this.show(null, this.x, this.y);

        this.token = token;
        session.removeMarker(this.marker);
        this.range = new Range(docPos.row, token.start, docPos.row, token.start + token.value.length);
        this.marker = session.addMarker(this.range, "ace_bracket", "text");
    };
    
    this.onMouseMove = function(e) {
        this.x = e.clientX;
        this.y = e.clientY;
        if (this.isOpen) {
            this.lastT = e.timeStamp;
            this.setPosition(this.x, this.y);
        }
        if (!this.$timer)
            this.$timer = setTimeout(this.update, 100);
    };

    this.onMouseOut = function(e) {
        if (e && e.currentTarget.contains(e.relatedTarget))
            return;
        this.hide();
        this.editor.session.removeMarker(this.marker);
        this.$timer = clearTimeout(this.$timer);
    };

    this.setPosition = function(x, y) {
        if (x + 10 + this.width > this.maxWidth)
            x = window.innerWidth - this.width - 10;
        if (y > window.innerHeight * 0.75 || y + 20 + this.height > this.maxHeight)
            y = y - this.height - 30;

        Tooltip.prototype.setPosition.call(this, x + 10, y + 20);
    };

    this.destroy = function() {
        this.onMouseOut();
        event.removeListener(this.editor.renderer.scroller, "mousemove", this.onMouseMove);
        event.removeListener(this.editor.renderer.content, "mouseout", this.onMouseOut);
        delete this.editor.tokenTooltip;
    };

}).call(TokenTooltip.prototype);

exports.TokenTooltip = TokenTooltip;

});