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/* Copyright (c) 2005 Tim Taylor Consulting (see LICENSE.txt) */

/* FIXME: assumes position styles are specified in 'px' */

ToolMan._coordinatesFactory = {

        create : function(x, y) {
                // FIXME: Safari won't parse 'throw' and aborts trying to do anything with this file
                //if (isNaN(x) || isNaN(y)) throw "invalid x,y: " + x + "," + y
                return new _ToolManCoordinate(this, x, y)
        },

        origin : function() {
                return this.create(0, 0)
        },

        /*
         * FIXME: Safari 1.2, returns (0,0) on absolutely positioned elements
         */
        topLeftPosition : function(element) {
                var left = parseInt(ToolMan.css().readStyle(element, "left"))
                var left = isNaN(left) ? 0 : left
                var top = parseInt(ToolMan.css().readStyle(element, "top"))
                var top = isNaN(top) ? 0 : top

                return this.create(left, top)
        },

        bottomRightPosition : function(element) {
                return this.topLeftPosition(element).plus(this._size(element))
        },

        topLeftOffset : function(element) {
                var offset = this._offset(element) 

                var parent = element.offsetParent
                while (parent) {
                        offset = offset.plus(this._offset(parent))
                        parent = parent.offsetParent
                }
                return offset
        },

        bottomRightOffset : function(element) {
                return this.topLeftOffset(element).plus(
                                this.create(element.offsetWidth, element.offsetHeight))
        },

        scrollOffset : function() {
                if (window.pageXOffset) {
                        return this.create(window.pageXOffset, window.pageYOffset)
                } else if (document.documentElement) {
                        return this.create(
                                        document.body.scrollLeft + document.documentElement.scrollLeft, 
                                        document.body.scrollTop + document.documentElement.scrollTop)
                } else if (document.body.scrollLeft >= 0) {
                        return this.create(document.body.scrollLeft, document.body.scrollTop)
                } else {
                        return this.create(0, 0)
                }
        },

        clientSize : function() {
                if (window.innerHeight >= 0) {
                        return this.create(window.innerWidth, window.innerHeight)
                } else if (document.documentElement) {
                        return this.create(document.documentElement.clientWidth,
                                        document.documentElement.clientHeight)
                } else if (document.body.clientHeight >= 0) {
                        return this.create(document.body.clientWidth,
                                        document.body.clientHeight)
                } else {
                        return this.create(0, 0)
                }
        },

        /**
         * mouse coordinate relative to the window (technically the
         * browser client area) i.e. the part showing your page
         *
         * NOTE: in Safari the coordinate is relative to the document
         */
        mousePosition : function(event) {
                event = ToolMan.events().fix(event)
                return this.create(event.clientX, event.clientY)
        },

        /**
         * mouse coordinate relative to the document
         */
        mouseOffset : function(event) {
                event = ToolMan.events().fix(event)
                if (event.pageX >= 0 || event.pageX < 0) {
                        return this.create(event.pageX, event.pageY)
                } else if (event.clientX >= 0 || event.clientX < 0) {
                        return this.mousePosition(event).plus(this.scrollOffset())
                }
        },

        _size : function(element) {
        /* TODO: move to a Dimension class */
                return this.create(element.offsetWidth, element.offsetHeight)
        },

        _offset : function(element) {
                return this.create(element.offsetLeft, element.offsetTop)
        }
}

function _ToolManCoordinate(factory, x, y) {
        this.factory = factory
        this.x = isNaN(x) ? 0 : x
        this.y = isNaN(y) ? 0 : y
}

_ToolManCoordinate.prototype = {
        toString : function() {
                return "(" + this.x + "," + this.y + ")"
        },

        plus : function(that) {
                return this.factory.create(this.x + that.x, this.y + that.y)
        },

        minus : function(that) {
                return this.factory.create(this.x - that.x, this.y - that.y)
        },

        min : function(that) {
                return this.factory.create(
                                Math.min(this.x , that.x), Math.min(this.y , that.y))
        },

        max : function(that) {
                return this.factory.create(
                                Math.max(this.x , that.x), Math.max(this.y , that.y))
        },

        constrainTo : function (one, two) {
                var min = one.min(two)
                var max = one.max(two)

                return this.max(min).min(max)
        },

        distance : function (that) {
                return Math.sqrt(Math.pow(this.x - that.x, 2) + Math.pow(this.y - that.y, 2))
        },

        reposition : function(element) {
                element.style["top"] = this.y + "px"
                element.style["left"] = this.x + "px"
        }
}