/*! Taken from django release 1.8.5

Copyright (c) Django Software Foundation and individual contributors.
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice,
       this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    3. Neither the name of Django nor the names of its contributors may be used
       to endorse or promote products derived from this software without
       specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

// Inserts shortcut buttons after all of the following:
//     <input type="text" class="vDateField">
//     <input type="text" class="vTimeField">

var DateTimeShortcuts = {
    calendars: [],
    calendarInputs: [],
    clockInputs: [],
    dismissClockFunc: [],
    dismissCalendarFunc: [],
    calendarDivName1: 'calendarbox', // name of calendar <div> that gets toggled
    calendarDivName2: 'calendarin',  // name of <div> that contains calendar
    calendarLinkName: 'calendarlink',// name of the link that is used to toggle
    clockDivName: 'clockbox',        // name of clock <div> that gets toggled
    clockLinkName: 'clocklink',      // name of the link that is used to toggle
    shortCutsClass: 'datetimeshortcuts', // class of the clock and cal shortcuts
    timezoneWarningClass: 'timezonewarning', // class of the warning for timezone mismatch
    timezoneOffset: 0,
    admin_media_prefix: '',
    init: function() {
        // Get admin_media_prefix by grabbing it off the window object. It's
        // set in the admin/base.html template, so if it's not there, someone's
        // overridden the template. In that case, we'll set a clearly-invalid
        // value in the hopes that someone will examine HTTP requests and see it.
        if (window.__admin_media_prefix__ != undefined) {
            DateTimeShortcuts.admin_media_prefix = window.__admin_media_prefix__;
        } else {
            DateTimeShortcuts.admin_media_prefix = '/missing-admin-media-prefix/';
        }

        if (window.__admin_utc_offset__ != undefined) {
            var serverOffset = window.__admin_utc_offset__;
            var localOffset = new Date().getTimezoneOffset() * -60;
            DateTimeShortcuts.timezoneOffset = localOffset - serverOffset;
        }

        var inputs = document.getElementsByTagName('input');
        for (i=0; i<inputs.length; i++) {
            var inp = inputs[i];
            if (inp.getAttribute('type') == 'text' && inp.className.match(/vTimeField/)) {
                DateTimeShortcuts.addClock(inp);
                DateTimeShortcuts.addTimezoneWarning(inp);
            }
            else if (inp.getAttribute('type') == 'text' && inp.className.match(/vDateField/)) {
                DateTimeShortcuts.addCalendar(inp);
                DateTimeShortcuts.addTimezoneWarning(inp);
            }
        }
    },
    // Return the current time while accounting for the server timezone.
    now: function() {
        if (window.__admin_utc_offset__ != undefined) {
            var serverOffset = window.__admin_utc_offset__;
            var localNow = new Date();
            var localOffset = localNow.getTimezoneOffset() * -60;
            localNow.setTime(localNow.getTime() + 1000 * (serverOffset - localOffset));
            return localNow;
        } else {
            return new Date();
        }
    },
    // Add a warning when the time zone in the browser and backend do not match.
    addTimezoneWarning: function(inp) {
        var $ = django.jQuery;
        var warningClass = DateTimeShortcuts.timezoneWarningClass;
        var timezoneOffset = DateTimeShortcuts.timezoneOffset / 3600;

        // Only warn if there is a time zone mismatch.
        if (!timezoneOffset)
            return;

        // Check if warning is already there.
        if ($(inp).siblings('.' + warningClass).length)
            return;

        var message;
        if (timezoneOffset > 0) {
            message = ngettext(
                'Note: You are %s hour ahead of server time.',
                'Note: You are %s hours ahead of server time.',
                timezoneOffset
            );
        }
        else {
            timezoneOffset *= -1
            message = ngettext(
                'Note: You are %s hour behind server time.',
                'Note: You are %s hours behind server time.',
                timezoneOffset
            );
        }
        message = interpolate(message, [timezoneOffset]);

        var $warning = $('<span>');
        $warning.attr('class', warningClass);
        $warning.text(message);

        $(inp).parent()
            .append($('<br>'))
            .append($warning)
    },
    // Add clock widget to a given field
    addClock: function(inp) {
        var num = DateTimeShortcuts.clockInputs.length;
        DateTimeShortcuts.clockInputs[num] = inp;
        DateTimeShortcuts.dismissClockFunc[num] = function() { DateTimeShortcuts.dismissClock(num); return true; };

        // Shortcut links (clock icon and "Now" link)
        var shortcuts_span = document.createElement('span');
        shortcuts_span.className = DateTimeShortcuts.shortCutsClass;
        inp.parentNode.insertBefore(shortcuts_span, inp.nextSibling);
        var now_link = document.createElement('a');
        now_link.setAttribute('href', "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", -1);");
        now_link.appendChild(document.createTextNode(gettext('Now')));
        var clock_link = document.createElement('a');
        clock_link.setAttribute('href', 'javascript:DateTimeShortcuts.openClock(' + num + ');');
        clock_link.id = DateTimeShortcuts.clockLinkName + num;
        quickElement('img', clock_link, '', 'src', DateTimeShortcuts.admin_media_prefix + 'img/icon_clock.gif', 'alt', gettext('Clock'));
        shortcuts_span.appendChild(document.createTextNode('\240'));
        shortcuts_span.appendChild(now_link);
        shortcuts_span.appendChild(document.createTextNode('\240|\240'));
        shortcuts_span.appendChild(clock_link);

        // Create clock link div
        //
        // Markup looks like:
        // <div id="clockbox1" class="clockbox module">
        //     <h2>Choose a time</h2>
        //     <ul class="timelist">
        //         <li><a href="#">Now</a></li>
        //         <li><a href="#">Midnight</a></li>
        //         <li><a href="#">6 a.m.</a></li>
        //         <li><a href="#">Noon</a></li>
        //     </ul>
        //     <p class="calendar-cancel"><a href="#">Cancel</a></p>
        // </div>

        var clock_box = document.createElement('div');
        clock_box.style.display = 'none';
        clock_box.style.position = 'absolute';
        clock_box.className = 'clockbox module';
        clock_box.setAttribute('id', DateTimeShortcuts.clockDivName + num);
        document.body.appendChild(clock_box);
        addEvent(clock_box, 'click', cancelEventPropagation);

        quickElement('h2', clock_box, gettext('Choose a time'));
        var time_list = quickElement('ul', clock_box);
        time_list.className = 'timelist';
        quickElement("a", quickElement("li", time_list), gettext("Now"), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", -1);");
        quickElement("a", quickElement("li", time_list), gettext("Midnight"), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", 0);");
        quickElement("a", quickElement("li", time_list), gettext("6 a.m."), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", 6);");
        quickElement("a", quickElement("li", time_list), gettext("Noon"), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", 12);");

        var cancel_p = quickElement('p', clock_box);
        cancel_p.className = 'calendar-cancel';
        quickElement('a', cancel_p, gettext('Cancel'), 'href', 'javascript:DateTimeShortcuts.dismissClock(' + num + ');');
        django.jQuery(document).bind('keyup', function(event) {
            if (event.which == 27) {
                // ESC key closes popup
                DateTimeShortcuts.dismissClock(num);
                event.preventDefault();
            }
        });
    },
    openClock: function(num) {
        var clock_box = document.getElementById(DateTimeShortcuts.clockDivName+num)
        var clock_link = document.getElementById(DateTimeShortcuts.clockLinkName+num)

        // Recalculate the clockbox position
        // is it left-to-right or right-to-left layout ?
        if (getStyle(document.body,'direction')!='rtl') {
            clock_box.style.left = findPosX(clock_link) + 17 + 'px';
        }
        else {
            // since style's width is in em, it'd be tough to calculate
            // px value of it. let's use an estimated px for now
            // TODO: IE returns wrong value for findPosX when in rtl mode
            //       (it returns as it was left aligned), needs to be fixed.
            clock_box.style.left = findPosX(clock_link) - 110 + 'px';
        }
        clock_box.style.top = Math.max(0, findPosY(clock_link) - 30) + 'px';

        // Show the clock box
        clock_box.style.display = 'block';
        addEvent(document, 'click', DateTimeShortcuts.dismissClockFunc[num]);
    },
    dismissClock: function(num) {
       document.getElementById(DateTimeShortcuts.clockDivName + num).style.display = 'none';
       removeEvent(document, 'click', DateTimeShortcuts.dismissClockFunc[num]);
    },
    handleClockQuicklink: function(num, val) {
       var d;
       if (val == -1) {
           d = DateTimeShortcuts.now();
       }
       else {
           d = new Date(1970, 1, 1, val, 0, 0, 0)
       }
       DateTimeShortcuts.clockInputs[num].value = d.strftime(get_format('TIME_INPUT_FORMATS')[0]);
       DateTimeShortcuts.clockInputs[num].focus();
       DateTimeShortcuts.dismissClock(num);
    },
    // Add calendar widget to a given field.
    addCalendar: function(inp) {
        var num = DateTimeShortcuts.calendars.length;

        DateTimeShortcuts.calendarInputs[num] = inp;
        DateTimeShortcuts.dismissCalendarFunc[num] = function() { DateTimeShortcuts.dismissCalendar(num); return true; };

        // Shortcut links (calendar icon and "Today" link)
        var shortcuts_span = document.createElement('span');
        shortcuts_span.className = DateTimeShortcuts.shortCutsClass;
        inp.parentNode.insertBefore(shortcuts_span, inp.nextSibling);
        var today_link = document.createElement('a');
        today_link.setAttribute('href', 'javascript:DateTimeShortcuts.handleCalendarQuickLink(' + num + ', 0);');
        today_link.appendChild(document.createTextNode(gettext('Today')));
        var cal_link = document.createElement('a');
        cal_link.setAttribute('href', 'javascript:DateTimeShortcuts.openCalendar(' + num + ');');
        cal_link.id = DateTimeShortcuts.calendarLinkName + num;
        quickElement('img', cal_link, '', 'src', DateTimeShortcuts.admin_media_prefix + 'img/icon_calendar.gif', 'alt', gettext('Calendar'));
        shortcuts_span.appendChild(document.createTextNode('\240'));
        shortcuts_span.appendChild(today_link);
        shortcuts_span.appendChild(document.createTextNode('\240|\240'));
        shortcuts_span.appendChild(cal_link);

        // Create calendarbox div.
        //
        // Markup looks like:
        //
        // <div id="calendarbox3" class="calendarbox module">
        //     <h2>
        //           <a href="#" class="link-previous">&lsaquo;</a>
        //           <a href="#" class="link-next">&rsaquo;</a> February 2003
        //     </h2>
        //     <div class="calendar" id="calendarin3">
        //         <!-- (cal) -->
        //     </div>
        //     <div class="calendar-shortcuts">
        //          <a href="#">Yesterday</a> | <a href="#">Today</a> | <a href="#">Tomorrow</a>
        //     </div>
        //     <p class="calendar-cancel"><a href="#">Cancel</a></p>
        // </div>
        var cal_box = document.createElement('div');
        cal_box.style.display = 'none';
        cal_box.style.position = 'absolute';
        cal_box.className = 'calendarbox module';
        cal_box.setAttribute('id', DateTimeShortcuts.calendarDivName1 + num);
        document.body.appendChild(cal_box);
        addEvent(cal_box, 'click', cancelEventPropagation);

        // next-prev links
        var cal_nav = quickElement('div', cal_box);
        var cal_nav_prev = quickElement('a', cal_nav, '<', 'href', 'javascript:DateTimeShortcuts.drawPrev('+num+');');
        cal_nav_prev.className = 'calendarnav-previous';
        var cal_nav_next = quickElement('a', cal_nav, '>', 'href', 'javascript:DateTimeShortcuts.drawNext('+num+');');
        cal_nav_next.className = 'calendarnav-next';

        // main box
        var cal_main = quickElement('div', cal_box, '', 'id', DateTimeShortcuts.calendarDivName2 + num);
        cal_main.className = 'calendar';
        DateTimeShortcuts.calendars[num] = new Calendar(DateTimeShortcuts.calendarDivName2 + num, DateTimeShortcuts.handleCalendarCallback(num));
        DateTimeShortcuts.calendars[num].drawCurrent();

        // calendar shortcuts
        var shortcuts = quickElement('div', cal_box);
        shortcuts.className = 'calendar-shortcuts';
        quickElement('a', shortcuts, gettext('Yesterday'), 'href', 'javascript:DateTimeShortcuts.handleCalendarQuickLink(' + num + ', -1);');
        shortcuts.appendChild(document.createTextNode('\240|\240'));
        quickElement('a', shortcuts, gettext('Today'), 'href', 'javascript:DateTimeShortcuts.handleCalendarQuickLink(' + num + ', 0);');
        shortcuts.appendChild(document.createTextNode('\240|\240'));
        quickElement('a', shortcuts, gettext('Tomorrow'), 'href', 'javascript:DateTimeShortcuts.handleCalendarQuickLink(' + num + ', +1);');

        // cancel bar
        var cancel_p = quickElement('p', cal_box);
        cancel_p.className = 'calendar-cancel';
        quickElement('a', cancel_p, gettext('Cancel'), 'href', 'javascript:DateTimeShortcuts.dismissCalendar(' + num + ');');
        django.jQuery(document).bind('keyup', function(event) {
            if (event.which == 27) {
                // ESC key closes popup
                DateTimeShortcuts.dismissCalendar(num);
                event.preventDefault();
            }
        });
    },
    openCalendar: function(num) {
        var cal_box = document.getElementById(DateTimeShortcuts.calendarDivName1+num)
        var cal_link = document.getElementById(DateTimeShortcuts.calendarLinkName+num)
        var inp = DateTimeShortcuts.calendarInputs[num];

        // Determine if the current value in the input has a valid date.
        // If so, draw the calendar with that date's year and month.
        if (inp.value) {
            var format = get_format('DATE_INPUT_FORMATS')[0];
            var selected = inp.value.strptime(format);
            var year = selected.getFullYear();
            var month = selected.getMonth() + 1;
            var re = /\d{4}/
            if (re.test(year.toString()) && month >= 1 && month <= 12) {
                DateTimeShortcuts.calendars[num].drawDate(month, year, selected);
            }
        }

        // Recalculate the clockbox position
        // is it left-to-right or right-to-left layout ?
        if (getStyle(document.body,'direction')!='rtl') {
            cal_box.style.left = findPosX(cal_link) + 17 + 'px';
        }
        else {
            // since style's width is in em, it'd be tough to calculate
            // px value of it. let's use an estimated px for now
            // TODO: IE returns wrong value for findPosX when in rtl mode
            //       (it returns as it was left aligned), needs to be fixed.
            cal_box.style.left = findPosX(cal_link) - 180 + 'px';
        }
        cal_box.style.top = Math.max(0, findPosY(cal_link) - 75) + 'px';

        cal_box.style.display = 'block';
        addEvent(document, 'click', DateTimeShortcuts.dismissCalendarFunc[num]);
    },
    dismissCalendar: function(num) {
        document.getElementById(DateTimeShortcuts.calendarDivName1+num).style.display = 'none';
        removeEvent(document, 'click', DateTimeShortcuts.dismissCalendarFunc[num]);
    },
    drawPrev: function(num) {
        DateTimeShortcuts.calendars[num].drawPreviousMonth();
    },
    drawNext: function(num) {
        DateTimeShortcuts.calendars[num].drawNextMonth();
    },
    handleCalendarCallback: function(num) {
        var format = get_format('DATE_INPUT_FORMATS')[0];
        // the format needs to be escaped a little
        format = format.replace('\\', '\\\\');
        format = format.replace('\r', '\\r');
        format = format.replace('\n', '\\n');
        format = format.replace('\t', '\\t');
        format = format.replace("'", "\\'");
        return ["function(y, m, d) { DateTimeShortcuts.calendarInputs[",
               num,
               "].value = new Date(y, m-1, d).strftime('",
               format,
               "');DateTimeShortcuts.calendarInputs[",
               num,
               "].focus();document.getElementById(DateTimeShortcuts.calendarDivName1+",
               num,
               ").style.display='none';}"].join('');
    },
    handleCalendarQuickLink: function(num, offset) {
       var d = DateTimeShortcuts.now();
       d.setDate(d.getDate() + offset)
       DateTimeShortcuts.calendarInputs[num].value = d.strftime(get_format('DATE_INPUT_FORMATS')[0]);
       DateTimeShortcuts.calendarInputs[num].focus();
       DateTimeShortcuts.dismissCalendar(num);
    }
}

addEvent(window, 'load', DateTimeShortcuts.init);
