/**
The MIT License

Copyright (c) 2007-2010 dgbadmin@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

*/

/**
 *  GCalendar Holidays - Googleカレンダーから日本の祝日を取得
 *  @see       http://0-oo.net/sbox/javascript/google-calendar-holidays
 *  @version   0.3.0 beta 2
 *  @copyright 2008-2010 dgbadmin@gmail.com
 *  @license   http://0-oo.net/pryn/MIT_license.txt (The MIT license)
 *
 *  See also
 *  @see http://code.google.com/intl/ja/apis/calendar/data/2.0/reference.html
 *  @see http://code.google.com/intl/ja/apis/gdata/docs/json.html
 */
var GCalHolidays = {
    /** GoogleカレンダーのID（複数でも可） */
    userIds: [
        "japanese__ja@holiday.calendar.google.com"  //Google公式版
        //"japanese@holiday.calendar.google.com"    //Google公式（英語）版
        //"outid3el0qkcrsuf89fltf7a4qbacgt9@import.calendar.google.com" //mozilla.org版
    ],

    /** 取得するイベント（スケジュール）の最大件数 */
    maxResults: 31,

    // @see http://code.google.com/intl/ja/apis/calendar/data/2.0/reference.html#Visibility
    visibility: "public",

    // @see http://code.google.com/intl/ja/apis/calendar/data/2.0/reference.html#Projection
    projection: "full-noattendees"
};
/**
 *  祝日を取得する
 *  @param  Function    callback    データ取得時に呼び出されるfunction
 *  @param  Number      year        (optional) 年（指定しなければ今年）
 *  @param  Number      month       (optional) 月（1～12 指定しなければ1年の全て）
 */
GCalHolidays.get = function(callback, year, month) {
    //日付範囲
    var padZero = function(value) { return ("0" + value).slice(-2); };
    var y = year || new Date().getFullYear();
    var start = [y, padZero(month || 1), "01"].join("-");
    var m = month || 12;
    var end = [y, padZero(m), padZero(new Date(y, m, 0).getDate())].join("-");

    this._caches = (this._caches || {});
    this._userCallback = callback;

    for (var i = 0, len = this.userIds.length; i < len; i++) {
        //取得済みの場合はそれを使う
        var cache = this._caches[i + ":" + start + ".." + end];
        if (cache) {
            callback(cache, i);
            continue;
        }

        //URL作成
        var url = location.protocol + "//www.google.com/calendar/feeds/";
        url += encodeURIComponent(this.userIds[i]) + "/";
        url += this.visibility + "/" + this.projection;
        url += "?alt=json-in-script&callback=GCalHolidays.decode";
        url += "&max-results=" + this.maxResults;
        url += "&start-min=" + start + "&start-max=" + end;

        //scriptタグ生成
        var script = document.createElement("script");
        script.type = "text/javascript";
        script.src = url;
        script.charset = "UTF-8";
        document.body.appendChild(script);
    }
};
/**
 *  JSONPによりGoogle Calendar API経由で呼び出されるfunction
 *  @param  Object  gdata   カレンダーデータ
 */
GCalHolidays.decode = function(gdata) {
    var days = GCalHolidays._entries2days(gdata.feed.entry);

    var links = gdata.feed.link;
    var href;
    for (var j = 0, len2 = links.length; j < len2; j++) {
        if (links[j].rel == "self") {
            href = links[j].href;
        }
    }

    //どのカレンダーか特定する
    var userId = decodeURIComponent(href.split("/")[5]);
    var index;
    for (var i = 0, len = this.userIds.length; i < len; i++) {
        if (this.userIds[i] == userId) {
            index = i;
            break;
        }
    }

    //キャッシュする
    var range = href.match(/\d{4}-\d{2}-\d{2}/g);   //日付範囲の最初の日と最後の日
    this._caches[index + ":" + range[0] + ".." + range[1]] = days;

    //コールバック
    this._userCallback(days, index);
};
/**
 *  JSONPで取得したデータから日付情報を取り出す
 *  @param  Array   entries スケジュール
 *  @return Array   日付情報（year, month, date, title）
 */
GCalHolidays._entries2days = function(entries) {
    if (!entries) {
        return [];
    }

    //日付順にソート
    entries.sort(function(a, b) {
        return (a.gd$when[0].startTime > b.gd$when[0].startTime) ? 1 : -1;
    });

    //シンプルな器に移す
    var days = [];
    for (var i = 0, len = entries.length; i < len; i++) {
        var ymd = entries[i].gd$when[0].startTime.split("T")[0].split("-");
        var title = entries[i].title.$t;
        //年月日は使いやすいように数値にする
        days[i] = { year: ymd[0] * 1, month: ymd[1] * 1, date: ymd[2] * 1, title: title };
    }

    return days;
};


/**
 *  jQuery UI Datepickerのカレンダーに祝日を表示する
 *  @see http://jqueryui.com/demos/datepicker/
 */
GCalHolidays.datepicker = function(year, month, inst) {
    //祝日のstyle
    var holidayStyle = { backgroundImage: "none", backgroundColor: "#fc2" };

    setTimeout(function() { //処理後に対象のdivが再構築されるケースを回避
        GCalHolidays.get(function(holidays) {
            for (var i = 0, len = holidays.length; i < len; i++) {
                var holiday = holidays[i];

                if (holiday.year != year || holiday.month != month) {
                    return; //既に別の月を表示している場合は何もしない
                }

                inst.dpDiv.find("a").each(function() {
                    if ($(this).text() == holiday.date) {
                        $(this).attr("title", holiday.title).css(holidayStyle);
                        return false;
                    }
                });
            }
        }, year, month);
    }, 1);
};
/**
 *  jQuery UI Datepickerが有効な場合、イベントハンドラを登録する
 */
if (window.$ && $.datepicker && $.datepicker.setDefaults) {
    $.datepicker.setDefaults({
        beforeShow: function(input, inst) {
            var date = $(input).datepicker("getDate") || new Date();
            GCalHolidays.datepicker(date.getFullYear(), date.getMonth() + 1, inst);
        },
        onChangeMonthYear: GCalHolidays.datepicker
    });
}