/*  Copyright Mihai Bazon, 2002, 2003  |  http://dynarch.com/mishoo/
 * ---------------------------------------------------------------------------
 *
 * The DHTML Calendar
 *
 * Details and latest version at:
 * http://dynarch.com/mishoo/calendar.epl
 *
 * This script is distributed under the GNU Lesser General Public License.
 * Read the entire license text here: http://www.gnu.org/licenses/lgpl.html
 *
 * This file defines helper functions for setting up the calendar.  They are
 * intended to help non-programmers get a working calendar on their site
 * quickly.  This script should not be seen as part of the calendar.  It just
 * shows you what one can do with the calendar, while in the same time
 * providing a quick and simple method for setting it up.  If you need
 * exhaustive customization of the calendar creation process feel free to
 * modify this code to suit your needs (this is recommended and much better
 * than modifying calendar.js itself).
 */


/**
 *  This function "patches" an input field (or other element) to use a calendar
 *  widget for date selection.
 *
 *  The "params" is a single object that can have the following properties:
 *
 *    prop. name   | description
 *  -------------------------------------------------------------------------------------------------
 *   inputField    | the ID of an input field to store the date
 *   displayArea   | the ID of a DIV or other element to show the date
 *   button        | ID of a button or other element that will trigger the calendar
 *   eventName     | event that will trigger the calendar, without the "on" prefix (default: "click")
 *   ifFormat      | date format that will be stored in the input field
 *   daFormat      | the date format that will be used to display the date in displayArea
 *   singleClick   | (true/false) wether the calendar is in single click mode or not (default: true)
 *   firstDay      | numeric: 0 to 6.  "0" means display Sunday first, "1" means display Monday first, etc.
 *   align         | alignment (default: "Br"); if you don't know what's this see the calendar documentation
 *   range         | array with 2 elements.  Default: [1900, 2999] -- the range of years available
 *   weekNumbers   | (true/false) if it's true (default) the calendar will display week numbers
 *   flat          | null or element ID; if not null the calendar will be a flat calendar having the parent with the given ID
 *   flatCallback  | function that receives a JS Date object and returns an URL to point the browser to (for flat calendar)
 *   disableFunc   | function that receives a JS Date object and should return true if that date has to be disabled in the calendar
 *   onSelect      | function that gets called when a date is selected.  You don't _have_ to supply this (the default is generally okay)
 *   onClose       | function that gets called when the calendar is closed.  [default]
 *   onUpdate      | function that gets called after the date is updated in the input field.  Receives a reference to the calendar.
 *   date          | the date that the calendar will be initially displayed to
 *   showsTime     | default: false; if true the calendar will include a time selector
 *   timeFormat    | the time format; can be "12" or "24", default is "12"
 *   electric      | if true (default) then given fields/date areas are updated for each move; otherwise they're updated only on close
 *   step          | configures the step of the years in drop-down boxes; default: 2
 *   position      | configures the calendar absolute position; default: null
 *   cache         | if "true" (but default: "false") it will reuse the same calendar object, where possible
 *   showOthers    | if "true" (but default: "false") it will show days from other months too
 *
 *  None of them is required, they all have default values.  However, if you
 *  pass none of "inputField", "displayArea" or "button" you'll get a warning
 *  saying "nothing to setup".
 */
Calendar.setup = function (params) {
    function param_default(pname, def) { if (typeof params[pname] == "undefined") { params[pname] = def; } };

    param_default("inputField",     null);
    param_default("displayArea",    null);
    param_default("button",         null);
    param_default("eventName",      "click");
    param_default("ifFormat",       "%Y/%m/%d");
    param_default("daFormat",       "%Y/%m/%d");
    param_default("singleClick",    true);
    param_default("disableFunc",    null);
    param_default("dateStatusFunc", params["disableFunc"]);	// takes precedence if both are defined
    param_default("dateText",       null);
    param_default("firstDay",       null);
    param_default("align",          "Br");
    param_default("range",          [1900, 2999]);
    param_default("weekNumbers",    true);
    param_default("flat",           null);
    param_default("flatCallback",   null);
    param_default("onSelect",       null);
    param_default("onClose",        null);
    param_default("onUpdate",       null);
    param_default("date",           null);
    param_default("showsTime",      false);
    param_default("timeFormat",     "24");
    param_default("electric",       true);
    param_default("step",           2);
    param_default("position",       null);
    param_default("cache",          false);
    param_default("showOthers",     false);
    param_default("multiple",       null);

    var tmp = ["inputField", "displayArea", "button"];
    for (var i in tmp) {
        if (typeof params[tmp[i]] == "string") {
            params[tmp[i]] = document.getElementById(params[tmp[i]]);
        }
    }
    if (!(params.flat || params.multiple || params.inputField || params.displayArea || params.button)) {
        alert("Calendar.setup:\n  Nothing to setup (no fields found).  Please check your code");
        return false;
    }

    function onSelect(cal) {
        var p = cal.params;
        var update = (cal.dateClicked || p.electric);
        if (update && p.inputField) {
            p.inputField.value = cal.date.print(p.ifFormat);
            if (typeof p.inputField.onchange == "function")
                p.inputField.onchange();
        }
        if (update && p.displayArea)
            p.displayArea.innerHTML = cal.date.print(p.daFormat);
        if (update && typeof p.onUpdate == "function")
            p.onUpdate(cal);
        if (update && p.flat) {
            if (typeof p.flatCallback == "function")
                p.flatCallback(cal);
        }
        if (update && p.singleClick && cal.dateClicked)
            cal.callCloseHandler();
    };

    if (params.flat != null) {
        if (typeof params.flat == "string")
            params.flat = document.getElementById(params.flat);
        if (!params.flat) {
            alert("Calendar.setup:\n  Flat specified but can't find parent.");
            return false;
        }
        var cal = new Calendar(params.firstDay, params.date, params.onSelect || onSelect);
        cal.showsOtherMonths = params.showOthers;
        cal.showsTime = params.showsTime;
        cal.time24 = (params.timeFormat == "24");
        cal.params = params;
        cal.weekNumbers = params.weekNumbers;
        cal.setRange(params.range[0], params.range[1]);
        cal.setDateStatusHandler(params.dateStatusFunc);
        cal.getDateText = params.dateText;
        if (params.ifFormat) {
            cal.setDateFormat(params.ifFormat);
        }
        if (params.inputField && typeof params.inputField.value == "string") {
            cal.parseDate(params.inputField.value);
        }
        cal.create(params.flat);
        cal.show();
        return false;
    }

    var triggerEl = params.button || params.displayArea || params.inputField;
    triggerEl["on" + params.eventName] = function() {
        var dateEl = params.inputField || params.displayArea;
        var dateFmt = params.inputField ? params.ifFormat : params.daFormat;
        var mustCreate = false;
        var cal = window.calendar;
        if (dateEl)
            params.date = Date.parseDate(dateEl.value || dateEl.innerHTML, dateFmt);
        if (!(cal && params.cache)) {
            window.calendar = cal = new Calendar(params.firstDay,
                                 params.date,
                                 params.onSelect || onSelect,
                                 params.onClose || function(cal) { cal.hide(); });
            cal.showsTime = params.showsTime;
            cal.time24 = (params.timeFormat == "24");
            cal.weekNumbers = params.weekNumbers;
            mustCreate = true;
        } else {
            if (params.date)
                cal.setDate(params.date);
            cal.hide();
        }
        if (params.multiple) {
            cal.multiple = {};
            for (var i = params.multiple.length; --i >= 0;) {
                var d = params.multiple[i];
                var ds = d.print("%Y%m%d");
                cal.multiple[ds] = d;
            }
        }
        cal.showsOtherMonths = params.showOthers;
        cal.yearStep = params.step;
        cal.setRange(params.range[0], params.range[1]);
        cal.params = params;
        cal.setDateStatusHandler(params.dateStatusFunc);
        cal.getDateText = params.dateText;
        cal.setDateFormat(dateFmt);
        if (mustCreate)
            cal.create();
        cal.refresh();
        if (!params.position)
            cal.showAtElement(params.button || params.displayArea || params.inputField, params.align);
        else
            cal.showAt(params.position[0], params.position[1]);
        return false;
    };

    return cal;
};
