/*
 * client-sided:
 * - builds dynamic menu
 * - calculates timestamps for query_strings
 * - checks consistency of time intervals
 *
 * (c) 2008 alexander.philipp.lintenhofer
 */

    var defaultMinutes =     6*60;
    var minMinutes     =       15;
    var maxMinutes     = 14*24*60;
    var direction      = 'to_past';
    var currfile       = 'overview.php';

    function link2graph(which,graph)
    {
        resetMenuColors();
        showHeatersettingsfields(false);
        showDurationfields(true);
        showLinevaluesfields(false);

        which.style.backgroundColor = "#fc0";
        currfile = 'graph.php?graph='+graph;
        which.href = currfile+'&'+(createTimelineQuerystring());
    }

    function link2dyngraph(which)
    {
        var naviform = document.forms['naviform'];
        var lineQuerystring = '';

        resetMenuColors();
        showHeatersettingsfields(false);
        showDurationfields(true);
        showLinevaluesfields(true);

        which.style.backgroundColor = "#fc0";

        for (i = 0; i < naviform.selectedlinevalues.length; i++)
        {
            if (naviform.selectedlinevalues.options[i].selected == true)
                lineQuerystring += naviform.selectedlinevalues.options[i].value+'%20';
        }
        currfile = 'dyngraph.php?lines='+(lineQuerystring.slice(0, -3));
        which.href = currfile+'&'+(createTimelineQuerystring());
    }

    function link2infocontent(which,file)
    {
        var timestamp = createTimestamp();
        resetMenuColors();
        showHeatersettingsfields(false);
        showDurationfields(false);
        showLinevaluesfields(false);
        which.style.backgroundColor = "#fc0";

        currfile = file;
        which.href = file+'?start='+timestamp;
    }
    
    function link2servicecontent(which,file)
    {
        var naviform = document.forms['naviform'];
        var timestamp = createTimestamp();
        resetMenuColors();
        showDurationfields(false);
        showHeatersettingsfields(true);
        showLinevaluesfields(false);
        which.style.backgroundColor = "#fc0";
        currfile = file;

        if (((tempeinsatz = Math.abs(naviform.tempeinsatz.value.replace(/^\s+|\s+$/g, '')))!='') &&
            ((basissoll   = Math.abs(naviform.basissoll.value.replace(/^\s+|\s+$/g, '')))!='') &&
            ((steilheit   = Math.abs(naviform.steilheit.value.replace(/^\s+|\s+$/g, '')))!=''))
        {
            if((tempeinsatz>20)||(tempeinsatz<5))
            {
                alert("5° < Einsatztemperatur < 20°");
                naviform.tempeinsatz.value='';
                showSetValIcon(false);
            }
            else if((basissoll>40)||(basissoll<15))
            {
                alert("15° < Basis-Soll < 40°");
                naviform.basissoll.value='';
                showSetValIcon(false);
            }
            else if((steilheit>100)||(steilheit<0))
            {
                alert("0% < Steilheit < 100%");
                naviform.steilheit.value='';
                showSetValIcon(false);
            }
            else
            {
                which.href = file+'?start='+timestamp+'&tempeinsatz='+tempeinsatz+'&basissoll='+basissoll+'&steilheit='+steilheit;
                showSetValIcon(true);
                return true;
            }
            return false;
        }
        which.href = file+'?start='+timestamp;
        return true;
    }

    function link2statisticcontent(which,file)
    {
        resetMenuColors();
        showDurationfields(false);
        showHeatersettingsfields(false);
        showSetValIcon(false);
        showLinevaluesfields(false);
        which.style.backgroundColor = "#fc0";

        currfile = file; 
        which.href = file;
    }
/* ============================================================================================== */
/* ============================================================================================== */
    function createTimelineQuerystring()
    {
        var naviform = document.forms['naviform'];
        var tsp_graphstart = 0;
        var tsp_now = Math.round((new Date()).getTime()/1000);

        var granularity = '1';
        for (i=0; i<naviform.granularity.length; i++)
            if(naviform.granularity[i].checked) granularity = naviform.granularity[i].value;

        var minutes = (Math.abs(naviform.ticks.value)>0)?Math.abs(naviform.ticks.value)*granularity:defaultMinutes;
        if (minutes<minMinutes) minutes=defaultMinutes;
        if (minutes>maxMinutes) minutes=maxMinutes;

        if (direction == 'to_future')
        {
            tsp_graphstart = createTimestamp();

            if (tsp_graphstart>=tsp_now) resetForm();
            else if ((tsp_graphstart+(60*minutes))>tsp_now)
            {
                minutes = Math.round((tsp_now - tsp_graphstart)/60);
                if (minutes<minMinutes) minutes = minMinutes;
                if (minutes>maxMinutes) minutes = maxMinutes;
                tsp_graphstart = tsp_now-(60*minutes);
                insertTime2Form(tsp_graphstart);
            }
            else if (tsp_graphstart==0) resetForm();
        }
        else
        {
            insertNowTime2Form();
            document.getElementById('durationdesc').innerHTML = 'letzte';
        }
        fillDurationform(minutes);
        return 'minutes='+minutes+'&start='+tsp_graphstart;
    }
    function createTimestamp()
    {
        var timestamp=0;
        var naviform = document.forms['naviform'];

        if (((yy = naviform.startyy.value.replace(/^\s+|\s+$/g, ''))!='') &&
            ((mm = naviform.startmm.value.replace(/^\s+|\s+$/g, ''))!='') &&
            ((dd = naviform.startdd.value.replace(/^\s+|\s+$/g, ''))!='') &&
            ((hh = naviform.starthh.value.replace(/^\s+|\s+$/g, ''))!='') &&
            ((min = naviform.startmin.value.replace(/^\s+|\s+$/g, ''))!='')
        )    timestamp = humanToTime(yy,mm,dd,hh,min);
        return timestamp;
    }
    function humanToTime(yy,mm,dd,hh,min)
    {
        var humDate = new Date(Date.UTC(yy,
            (stripLeadingZeroes(mm)-1),
            stripLeadingZeroes(dd),
            stripLeadingZeroes(hh),
            stripLeadingZeroes(min),
            0));
        offset =(isDaylightSaving(yy,mm,dd))?3600:7200;
        return (humDate.getTime()/1000.0)-offset;
    }
    function stripLeadingZeroes(input)
    {
        if((input.length > 1) && (input.substr(0,1) == "0")) return input.substr(1);
        else return input;
    }
/* ============================================================================================== */
    function isDaylightSaving(yy,mm,dd)
    {
        var gmt = new Date(yy,mm-1,dd);
        var lsm = new Date;
        var lso = new Date;
        lsm.setYear(yy);
        lsm.setMonth(2); // March
        lsm.setDate(31);
        var day = lsm.getDay();// day of week of 31st
        lsm.setDate(31-day-1); // last Sunday
        lso.setYear(yy);
        lso.setMonth(9); // October
        lso.setDate(31);
        day = lso.getDay();
        lso.setDate(31-day-1);

        if (gmt > lso) return 1;  // lso -> newyear
        else if (gmt > lsm) return 0;  // lsm -> lso
        else return 1; // newyear -> lsm
    }
/* ============================================================================================== */
    function insertNowDate2Form()
    {
        var now = new Date();
        var day = (now.getDate()>=10)?now.getDate():'0'+now.getDate();
        var month = (now.getMonth()>=9)?now.getMonth()+1:'0'+(now.getMonth()+1);

        document.forms['naviform'].startdd.value=day;
        document.forms['naviform'].startmm.value=month;
        document.forms['naviform'].startyy.value=now.getFullYear();
    }
    function insertNowTime2Form()
    {
        var now = new Date();
        var hours = (now.getHours()>=10)?now.getHours():'0'+now.getHours();
        var minutes = (now.getMinutes()>=10)?now.getMinutes():'0'+now.getMinutes();
        document.forms['naviform'].starthh.value=hours;
        document.forms['naviform'].startmin.value=minutes;
    }
    function insertDate2Form(tsp)
    {
        alert(tsp);
        var now = new Date(tsp*1000);
        var day = (now.getDate()>=10)?now.getDate():'0'+now.getDate();
        var month = (now.getMonth()>=9)?now.getMonth()+1:'0'+(now.getMonth()+1);

        document.forms['naviform'].startdd.value=day;
        document.forms['naviform'].startmm.value=month;
        document.forms['naviform'].startyy.value=now.getFullYear();
    }
    function insertTime2Form(tsp)
    {
        var now = new Date(tsp*1000);
        var hours = (now.getHours()>=10)?now.getHours():'0'+now.getHours();
        var minutes = (now.getMinutes()>=10)?now.getMinutes():'0'+now.getMinutes();
        document.forms['naviform'].starthh.value=hours;
        document.forms['naviform'].startmin.value=minutes;
    }
/* ============================================================================================== */
    function fillDurationform(minutes)
    {
        var naviform = document.forms['naviform'];
        var granularity = 1;

        if (minutes%1440==0) granularity = 1440;
        else if (minutes%60==0) granularity = 60;

        naviform.ticks.value = minutes/granularity;
        for (i=0; i<naviform.granularity.length; i++)
            if(naviform.granularity[i].value==granularity) naviform.granularity[i].checked=true;
    }
/* ============================================================================================== */
    function showDurationfields(visible)
    {
        var fields = document.getElementById('durationfields');

        if(visible) fields.style.visibility = "visible";
        else fields.style.visibility = "hidden";
    }
    function showHeatersettingsfields(visible)
    {
        var fields = document.getElementById('heatersettings');

        if(visible) fields.style.visibility = "visible";
        else
        {
            showSetValIcon(false);
            fields.style.visibility = "hidden";
        }
    }
    function showSetValIcon(visible)
    {
        var fields = document.getElementById('setvalicon');

        if(visible) fields.style.visibility = "visible";
        else fields.style.visibility = "hidden";
    }
    function showLinevaluesfields(visible)
    {
        var fields = document.getElementById('linevalues');

        if(visible) fields.style.visibility = "visible";
        else fields.style.visibility = "hidden";
    }
/* ============================================================================================== */
    function initForm()
    {
        showDurationfields(false);
        showHeatersettingsfields(false);
        showLinevaluesfields(false);
        resetMenuColors();
        insertNowTime2Form();
        insertNowDate2Form();
        fillDurationform(defaultMinutes);
    }
    function resetForm()
    {
        direction = 'to_past';
        minutes = defaultMinutes;
        document.getElementById('durationdesc').innerHTML = 'letzte';
        insertNowTime2Form();
        insertNowDate2Form();
        fillDurationform(minutes);
    }
/* ============================================================================================== */
    function formatEntries()
    {
        var naviform = document.forms['naviform'];

        if(naviform.startmm.value!='')
            naviform.startmm.value = (naviform.startmm.value.length > 1)?
                                            naviform.startmm.value.replace(/^\s+|\s+$/g, ''):
                                            '0'+naviform.startmm.value.replace(/^\s+|\s+$/g, '');

        if(naviform.startdd.value!='')
            naviform.startdd.value = (naviform.startdd.value.length > 1)?
                                            naviform.startdd.value.replace(/^\s+|\s+$/g, ''):
                                            '0'+naviform.startdd.value.replace(/^\s+|\s+$/g, '');

        if(naviform.starthh.value!='')
            naviform.starthh.value = (naviform.starthh.value.length > 1)?
                                            naviform.starthh.value.replace(/^\s+|\s+$/g, ''):
                                            '0'+naviform.starthh.value.replace(/^\s+|\s+$/g, '');

        if(naviform.startmin.value!='')
            naviform.startmin.value = (naviform.startmin.value.length > 1)?
                                            naviform.startmin.value.replace(/^\s+|\s+$/g, ''):
                                            '0'+naviform.startmin.value.replace(/^\s+|\s+$/g, '');
    }
/* ============================================================================================== */
    function changeDirection()
    {
        s = 'f&uuml;r';
        document.getElementById('durationdesc').innerHTML = s;
        direction = 'to_future';
    }
/* ============================================================================================== */
    function resetMenuColors()
    {
        var ul = navigation.getElementsByTagName('a');
        for(var i=0;i < ul.length; i++)
        {
            ul[i].style.backgroundColor = "#f0f0f0";
        }
    }