/*
 * jQuery form plugin
 * @requires jQuery v1.0.3
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id$
 * Version: 0.9
 */

jQuery.fn.ajaxSubmit = function(options) {
    if (typeof options == 'function')
        options = { success: options };

    options = jQuery.extend({
        url:    this.attr('action') || '',
        method: this.attr('method') || 'GET'
    }, options || {});

    options.success = options.success || options.after;
    options.beforeSubmit = options.beforeSubmit || options.before;
    options.type = options.type || options.method;

    var a = this.formToArray(options.semantic);

    if (options.beforeSubmit && options.beforeSubmit(a, this, options) === false) return this;

    var q = jQuery.param(a);

    if (options.type.toUpperCase() == 'GET') {
        options.url += (options.url.indexOf('?') >= 0 ? '&' : '?') + q;
        options.data = null;
    }
    else
        options.data = q;

    var $form = this, callbacks = [];
    if (options.resetForm) callbacks.push(function() { $form.resetForm(); });
    if (options.clearForm) callbacks.push(function() { $form.clearForm(); });

    if (!options.dataType && options.target) {
        var oldSuccess = options.success || function(){};
        callbacks.push(function(data, status) {
            jQuery(options.target).attr("innerHTML", data).evalScripts().each(oldSuccess, [data, status]);
        });
    }
    else if (options.success)
        callbacks.push(options.success);

    options.success = function(data, status) {
        for (var i=0, max=callbacks.length; i < max; i++)
            callbacks[i](data, status);
    };

    jQuery.ajax(options);
    return this;
};

jQuery.fn.ajaxForm = function(options) {
    return this.each(function() {
        jQuery("input:submit,input:image,button:submit", this).click(function(ev) {
            var $form = this.form;
            $form.clk = this;
            if (this.type == 'image') {
                if (ev.offsetX != undefined) {
                    $form.clk_x = ev.offsetX;
                    $form.clk_y = ev.offsetY;
                } else if (typeof jQuery.fn.offset == 'function') { // try to use dimensions plugin
                    var offset = jQuery(this).offset();
                    $form.clk_x = ev.pageX - offset.left;
                    $form.clk_y = ev.pageY - offset.top;
                } else {
                    $form.clk_x = ev.pageX - this.offsetLeft;
                    $form.clk_y = ev.pageY - this.offsetTop;
                }
            }
            setTimeout(function() {
                $form.clk = $form.clk_x = $form.clk_y = null;
                }, 10);
        })
    }).submit(function(e) {
        jQuery(this).ajaxSubmit(options);
        return false;
    });
};

jQuery.fn.formToArray = function(semantic) {
    var a = [];
    if (this.length == 0) return a;

    var form = this[0];
    var els = semantic ? form.getElementsByTagName('*') : form.elements;
    if (!els) return a;
    for(var i=0, max=els.length; i < max; i++) {
        var el = els[i];
        var n = el.name;
        if (!n) continue;

        if (semantic && form.clk && el.type == "image") {
            if(!el.disabled && form.clk == el)
                a.push({name: n+'.x', value: form.clk_x}, {name: n+'.y', value: form.clk_y});
            continue;
        }
        var v = jQuery.fieldValue(el, true);
        if (v === null) continue;
        if (v.constructor == Array) {
            for(var j=0, jmax=v.length; j < jmax; j++)
                a.push({name: n, value: v[j]});
        }
        else
            a.push({name: n, value: v});
    }

    if (!semantic && form.clk) {
        var inputs = form.getElementsByTagName("input");
        for(var i=0, max=inputs.length; i < max; i++) {
            var input = inputs[i];
            var n = input.name;
            if(n && !input.disabled && input.type == "image" && form.clk == input)
                a.push({name: n+'.x', value: form.clk_x}, {name: n+'.y', value: form.clk_y});
        }
    }
    return a;
};


jQuery.fn.formSerialize = function(semantic) {
    return jQuery.param(this.formToArray(semantic));
};


jQuery.fn.fieldSerialize = function(successful) {
    var a = [];
    this.each(function() {
        var n = this.name;
        if (!n) return;
        var v = jQuery.fieldValue(this, successful);
        if (v && v.constructor == Array) {
            for (var i=0,max=v.length; i < max; i++)
                a.push({name: n, value: v[i]});
        }
        else if (v !== null && typeof v != 'undefined')
            a.push({name: this.name, value: v});
    });
    return jQuery.param(a);
};


jQuery.fn.fieldValue = function(successful) {
    var cbVal, cbName;

    for (var i=0, max=this.length; i < max; i++) {
        var el = this[i];
        var v = jQuery.fieldValue(el, successful);
        if (v === null || typeof v == 'undefined' || (v.constructor == Array && !v.length))
            continue;

        if (el.type != 'checkbox') return v;

        cbName = cbName || el.name;
        if (cbName != el.name)
            return cbVal;
        cbVal = cbVal || [];
        cbVal.push(v);
    }
    return cbVal;
};


jQuery.fieldValue = function(el, successful) {
    var n = el.name, t = el.type, tag = el.tagName.toLowerCase();
    if (typeof successful == 'undefined') successful = true;

    if (successful && ( !n || el.disabled || t == 'reset' ||
        (t == 'checkbox' || t == 'radio') && !el.checked ||
        (t == 'submit' || t == 'image') && el.form && el.form.clk != el ||
        tag == 'select' && el.selectedIndex == -1))
            return null;

    if (tag == 'select') {
        var index = el.selectedIndex;
        if (index < 0) return null;
        var a = [], ops = el.options;
        var one = (t == 'select-one');
        var max = (one ? index+1 : ops.length);
        for(var i=(one ? index : 0); i < max; i++) {
            var op = ops[i];
            if (op.selected) {
                var v = jQuery.browser.msie && !(op.attributes['value'].specified) ? op.text : op.value;
                if (one) return v;
                a.push(v);
            }
        }
        return a;
    }
    return el.value;
};

jQuery.fn.clearForm = function() {
    return this.each(function() {
        jQuery('input,select,textarea', this).clearFields();
    });
};

jQuery.fn.clearFields = jQuery.fn.clearInputs = function() {
    return this.each(function() {
        var t = this.type, tag = this.tagName.toLowerCase();
        if (t == 'text' || t == 'password' || tag == 'textarea')
            this.value = '';
        else if (t == 'checkbox' || t == 'radio')
            this.checked = false;
        else if (tag == 'select')
            this.selectedIndex = -1;
    });
};

jQuery.fn.resetForm = function() {
    return this.each(function() {
        if (typeof this.reset == 'function' || (typeof this.reset == 'object' && !this.reset.nodeType))
            this.reset();
    });
};