var activecalevt;
var caledit_select_oldval;
var caledit_ismodified;
var caledit_loaded;
var current_form;
var saved_form;
var caledit_defmsg = "(Esc)返回 (Ctrl-M)切換編輯 (Ctrl-左)左側 (Ctrl-右)右側 (Alt-U)新增或儲存 (Alt-K)刪除 (Alt-R)復原";

function caledit(year, month, date){
    var allbrowseobj = document.getElementsByName("calbrowse");
    var alldetailobj = document.getElementsByName("caldetail");
    var i;
    $(document).unbind("keydown.main");
    $(document).bind("keydown.caledit", "ctrl+m", caledit_edit);
    $(document).bind("keydown.caledit", "ctrl+left", caledit_focus_left);
    $(document).bind("keydown.caledit", "ctrl+right", caledit_focus_right);
    $(document).bind("keydown.caledit", "esc", caledit_quit);
    $(document).bind("keydown.caledit", "alt+u", caledit_save_func);
    $(document).bind("keydown.caledit", "alt+r", caledit_discard_func);
    $(document).bind("keydown.caledit", "alt+k", caledit_delete_func);
    status_bar_save();
    status_bar_set(caledit_defmsg);
    caledit_switchedit_disable();
    for(i=0; i<allbrowseobj.length; i++){
        allbrowseobj[i].style.display = "none";
    }
    for(i=0; i<alldetailobj.length; i++){
        alldetailobj[i].style.display = "block";
    }
    document.getElementById("switchlist").style.display = "none";
    document.getElementById("googlelogout").style.display = "none";
    current_form = new CalEvent();
    saved_form = new CalEvent();
    activecalevt = new Array();
    caledit_createoption();
    caledit_ismodified = false;
    caledit_loaded = false;
    document.getElementById("caledit_select").value = "new";
    caledit_loader(document.getElementById("caledit_newentry"));
}

function caledit_quit(){
    var allbrowseobj = document.getElementsByName("calbrowse");
    var alldetailobj = document.getElementsByName("caldetail");
    var i;
    try{
        if(caledit_loaded){
            if(caledit_validate()){
                caledit_write_current();
            }else{
                throw null;
            }
        }
        if(!saved_form.equal(current_form)){
            throw "您有尚未儲存的資訊，無法離開！";
        }
    }catch(err){
        document.getElementById("caledit_select").value = caledit_select_oldval;
        if(err != null){
            status_bar_warning(err);
        }
        return;
    }
    $(document).unbind("keydown.main");
    $(document).unbind("keydown.caledit");
    for(i=0; i<allbrowseobj.length; i++){
        allbrowseobj[i].style.display = "block";
    }
    for(i=0; i<alldetailobj.length; i++){
        alldetailobj[i].style.display = "none";
    }
    shortcut_bind();
    status_bar_restore();
    document.getElementById("switchlist").style.display = "inline";
    document.getElementById("googlelogout").style.display = "inline";
    caledit_clearoption();
    caledit_clean();
    if(caledit_ismodified){
        setmonthcal();
        setfocusblock(value_date);
    }
}

function caledit_edit()
{   
    var buttonobj;
    buttonobj = document.getElementById("caledit_switchedit");
    document.getElementById("caledit_dyn_year").style.display = "inline";
    switch(buttonobj.value){
        case "編輯":
            caledit_switchedit_enable();
            break;
        case "唯讀":
            caledit_switchedit_disable();
            break;
    }
}

function caledit_switchedit_enable()
{
    var buttonobj;
    var msgobj;
    var roobj, rwobj, robobj, rwbobj;
    var i;
    buttonobj = document.getElementById("caledit_switchedit");
    msgobj = document.getElementById("caledit_enabled");
    roobj = document.getElementsByName("caledit_read");
    rwobj = document.getElementsByName("caledit_write");
    robobj = document.getElementsByName("caledit_read_block");
    rwbobj = document.getElementsByName("caledit_write_block");
    buttonobj.value = "唯讀";
    msgobj.innerHTML = "編輯模式";
    for(i=0; i<roobj.length; i++){
        roobj[i].style.display = "none";
    }
    for(i=0; i<rwobj.length; i++){
        rwobj[i].style.display = "inline";
    }
    for(i=0; i<robobj.length; i++){
        robobj[i].style.display = "none";
    }
    for(i=0; i<rwbobj.length; i++){
        rwbobj[i].style.display = "block";
    }
    document.getElementById("caledit_save").style.display = "inline";
    document.getElementById("caledit_discard").style.display = "inline";
}

function caledit_switchedit_disable()
{
    var buttonobj;
    var msgobj;
    var roobj, rwobj, robobj, rwbobj;
    buttonobj = document.getElementById("caledit_switchedit");
    msgobj = document.getElementById("caledit_enabled");
    roobj = document.getElementsByName("caledit_read");
    rwobj = document.getElementsByName("caledit_write");
    robobj = document.getElementsByName("caledit_read_block");
    rwbobj = document.getElementsByName("caledit_write_block");
    buttonobj.value = "編輯";
    msgobj.innerHTML = "檢視模式";
    for(i=0; i<roobj.length; i++){
        roobj[i].style.display = "inline-block";
    }
    for(i=0; i<rwobj.length; i++){
        rwobj[i].style.display = "none";
    }
    for(i=0; i<robobj.length; i++){
        robobj[i].style.display = "block";
    }
    for(i=0; i<rwbobj.length; i++){
        rwbobj[i].style.display = "none";
    }
    document.getElementById("caledit_save").style.display = "none";
    document.getElementById("caledit_discard").style.display = "none";
    caledit_copyback();
}

function caledit_focus_left(){
    $("#caledit_select").focus();
}

function caledit_focus_right(){
    $("#caledit_switchedit").focus();
}

function caledit_clean(){
    var i;
    var roobj, rwobj, robobj, rwbobj;
    roobj = document.getElementsByName("caledit_read");
    rwobj = document.getElementsByName("caledit_write");
    robobj = document.getElementsByName("caledit_read_block");
    rwbobj = document.getElementsByName("caledit_write_block");
    for(i=0; i<roobj.length; i++){
        roobj[i].innerHTML = "";
    }
    for(i=0; i<rwobj.length; i++){
        rwobj[i].value = "";
    }
    for(i=0; i<robobj.length; i++){
        robobj[i].innerHTML = "";
    }
    for(i=0; i<rwbobj.length; i++){
        rwbobj[i].value = "";
    }
}

function caledit_fill(calevt){
    var yearobj, monthobj, dateobj, hourobj, minuteobj;
    var titleobj, remindobj, contentobj;
    var datafromobj; /* 這項不能修改 */
    yearobj = document.getElementById("caledit_static_year");
    monthobj = document.getElementById("caledit_static_month");
    dateobj = document.getElementById("caledit_static_date");
    hourobj = document.getElementById("caledit_static_hour");
    minuteobj = document.getElementById("caledit_static_minute");
    titleobj = document.getElementById("caledit_static_title");
    remindobj = document.getElementById("caledit_static_remind");
    contentobj = document.getElementById("caledit_static_content");
    datafromobj = document.getElementById("caledit_datafrom");
    yearobj.textContent = calevt.datetime.getFullYear();
    monthobj.textContent = calevt.datetime.getMonth() + 1;
    dateobj.textContent = calevt.datetime.getDate();
    hourobj.textContent = calevt.datetime.getHours();
    minuteobj.textContent = calevt.datetime.getMinutes();
    titleobj.textContent = calevt.title;
    remindobj.textContent = calevt.remind;
    contentobj.textContent = calevt.content;
    switch(calevt.datafrom){
        case 'native':
            datafromobj.innerHTML = productname;
            break;
        case 'google':
            datafromobj.innerHTML = 'Google 行事曆';
            break;
        case 'ntuceiba':
            datafromobj.innerHTML = '臺大 CEIBA 網站';
            break;
        default:
            datafromobj.innerHTML = '來源不明';
    }

    yearobj = document.getElementById("caledit_dyn_year");
    monthobj = document.getElementById("caledit_dyn_month");
    dateobj = document.getElementById("caledit_dyn_date");
    hourobj = document.getElementById("caledit_dyn_hour");
    minuteobj = document.getElementById("caledit_dyn_minute");
    titleobj = document.getElementById("caledit_dyn_title");
    remindobj = document.getElementById("caledit_dyn_remind");
    contentobj = document.getElementById("caledit_dyn_content");
    yearobj.value = calevt.datetime.getFullYear();
    monthobj.value = calevt.datetime.getMonth() + 1;
    dateobj.value = calevt.datetime.getDate();
    hourobj.value = calevt.datetime.getHours();
    minuteobj.value = calevt.datetime.getMinutes();
    titleobj.value = calevt.title;
    remindobj.value = calevt.remind;
    contentobj.value = calevt.content;
}

function caledit_copyback(){
    var yearobj, monthobj, dateobj, hourobj, minuteobj;
    var titleobj, remindobj, contentobj;
    var yearobjw, monthobjw, dateobjw, hourobjw, minuteobjw;
    var titleobjw, remindobjw, contentobjw;

    yearobj = document.getElementById("caledit_static_year");
    monthobj = document.getElementById("caledit_static_month");
    dateobj = document.getElementById("caledit_static_date");
    hourobj = document.getElementById("caledit_static_hour");
    minuteobj = document.getElementById("caledit_static_minute");
    titleobj = document.getElementById("caledit_static_title");
    remindobj = document.getElementById("caledit_static_remind");
    contentobj = document.getElementById("caledit_static_content");

    yearobjw = document.getElementById("caledit_dyn_year");
    monthobjw = document.getElementById("caledit_dyn_month");
    dateobjw = document.getElementById("caledit_dyn_date");
    hourobjw = document.getElementById("caledit_dyn_hour");
    minuteobjw = document.getElementById("caledit_dyn_minute");
    titleobjw = document.getElementById("caledit_dyn_title");
    remindobjw = document.getElementById("caledit_dyn_remind");
    contentobjw = document.getElementById("caledit_dyn_content");

    yearobj.textContent = yearobjw.value;
    monthobj.textContent = monthobjw.value;
    dateobj.textContent = dateobjw.value;
    hourobj.textContent = hourobjw.value;
    minuteobj.textContent = minuteobjw.value;
    titleobj.textContent = titleobjw.value;
    remindobj.textContent = remindobjw.value;
    contentobj.textContent = contentobjw.value;
}

function caledit_validate(){
    var yearobjw, monthobjw, dateobjw, hourobjw, minuteobjw;
    var titleobjw, remindobjw, contentobjw;
    var yearvalue, monthvalue;
    var tmp;
    yearobjw = document.getElementById("caledit_dyn_year");
    monthobjw = document.getElementById("caledit_dyn_month");
    dateobjw = document.getElementById("caledit_dyn_date");
    hourobjw = document.getElementById("caledit_dyn_hour");
    minuteobjw = document.getElementById("caledit_dyn_minute");
    titleobjw = document.getElementById("caledit_dyn_title");
    remindobjw = document.getElementById("caledit_dyn_remind");
    contentobjw = document.getElementById("caledit_dyn_content");
    
    try{
        yearvalue = parseInt(yearobjw.value);
        if(!isFinite(yearvalue)){
            throw "請輸入正確的年份！";
        }
        if(yearvalue < 1970){
            throw "請輸入 1970 年以後的年份！";
        }
        monthvalue = parseInt(monthobjw.value);
        if(!isFinite(monthvalue) || monthvalue < 1 || monthvalue > 12){
            throw "請輸入正確的月份！";
        }
        tmp = parseInt(dateobjw.value);
        if(!isFinite(tmp) || tmp < 1 || 
            tmp > get_month_max_day(yearvalue, monthvalue - 1)){
            throw "請輸入正確的日期！";
        }
        tmp = parseInt(hourobjw.value);
        if(!isFinite(tmp) || tmp < 0 || tmp >= 24){
            throw "請輸入正確的時間（小時）！";
        }
        tmp = parseInt(minuteobjw.value);
        if(!isFinite(tmp) || tmp < 0 || tmp >= 60){
            throw "請輸入正確的時間（分鐘）！";
        }
        tmp = remindobjw.value;
        if(tmp == "NaN"){
            tmp = "";
        }
        if(tmp != "" && !isFinite(parseInt(tmp))){
            throw "請輸入正確的提醒時間！";
        }
        tmp = titleobjw.value;
        if(tmp.length <= 0){
            throw "標題不可為空白！";
        }
    }catch(err){
        status_bar_warning(err);
        return false;
    }

    return true;
}

function caledit_write_current(){
    var yearobjw, monthobjw, dateobjw, hourobjw, minuteobjw;
    var titleobjw, remindobjw, contentobjw;
    var yearvalue, monthvalue;
    var tmp;
    yearobjw = document.getElementById("caledit_dyn_year");
    monthobjw = document.getElementById("caledit_dyn_month");
    dateobjw = document.getElementById("caledit_dyn_date");
    hourobjw = document.getElementById("caledit_dyn_hour");
    minuteobjw = document.getElementById("caledit_dyn_minute");
    titleobjw = document.getElementById("caledit_dyn_title");
    remindobjw = document.getElementById("caledit_dyn_remind");
    contentobjw = document.getElementById("caledit_dyn_content");
    
    current_form.datetime.setFullYear(
        parseInt(yearobjw.value),
        parseInt(monthobjw.value) - 1,
        parseInt(dateobjw.value));
    current_form.datetime.setHours(
        parseInt(hourobjw.value),
        parseInt(minuteobjw.value),
        0, 0);

    current_form.remind = parseInt(remindobjw.value);
    current_form.title = titleobjw.value;
    current_form.content = contentobjw.value;
}

function caledit_loader(myself){
    var newcalevent;
    var dataindex;

    try{
        if(caledit_loaded){
            if(caledit_validate()){
                caledit_write_current();
            }else{
                throw false;
            }
        }
    }catch(err){
        myself.value = caledit_select_oldval;
        return;
    }

    if(current_form.equal(saved_form)){
        if(myself.value == "new"){
            newcalevent = new CalEvent();
            newcalevent.datetime.setFullYear(
                    value_year, value_month - 1, value_date);
            newcalevent.datetime.setHours(0, 0);
            caledit_fill(newcalevent);
            saved_form = newcalevent.clone();
            current_form = newcalevent.clone();
            status_bar_set("新增" + " " + caledit_defmsg);
            caledit_switchedit_enable();
            document.getElementById("caledit_save").value = "新增";
            document.getElementById("caledit_delete").style.display = "none";
        }else{
            dataindex = parseInt(myself.value);
            caledit_fill(activecalevt[dataindex]);
            saved_form = activecalevt[dataindex].clone();
            current_form = activecalevt[dataindex].clone();
            dataindex++;
            status_bar_set(dataindex.toString() + " " + caledit_defmsg);
            caledit_switchedit_disable();
            if(current_form.deleted){
                document.getElementById("caledit_save").value = "重新插入";
            }else{
                document.getElementById("caledit_save").value = "儲存";
            }
            document.getElementById("caledit_delete").style.display = "inline";
        }
        caledit_select_oldval = myself.value;
    }else{
        status_bar_warning("您有尚未儲存的資訊，無法切換活動！");
        myself.value = caledit_select_oldval;
    }

    caledit_loaded = true;
}

function caledit_discard_func(){
    caledit_fill(saved_form);
}

function caledit_delete_func(){
    caledit_write_current();
    if(current_form.key == null){
        return;
    }else{
        inccal_remove(current_form, function(){
            var selobj = document.getElementById("caledit_select");
            var oldval = parseInt(caledit_select_oldval);
            current_form.key = null;
            current_form.deleted = true;
            saved_form = current_form.clone();
            activecalevt[oldval] = current_form.clone();
            document.getElementById("calselopt" + 
                caledit_select_oldval.toString()).textContent = 
                '<刪>';
            caledit_ismodified = true;
            if(oldval < activecalevt.length - 1){
                selobj.value = (oldval + 1).toString();
                caledit_loader(selobj);
            }else{
                selobj.value = "new";
                caledit_loader(selobj);
            }
        });
    }
}

function caledit_save_func(){
    var oldtree;
    var newnode;
    var newcount;
    if(caledit_validate()){
        caledit_write_current();
    }else{
        return false;
    }
    inccal_send(current_form, function(resp){
        status_bar_set("資料已儲存");
        if(current_form.key == null){
            newcount = activecalevt.length;
            activecalevt[newcount] = current_form.clone();
            activecalevt[newcount].deleted = false;
            activecalevt[newcount].key = resp;
            oldtree = document.getElementById("caledit_select");
            newnode = document.createElement("option");
            newnode.setAttribute("id", "calselopt" + newcount.toString());
            newnode.value = newcount;
            newnode.textContent = '<新> ' + 
                generate_display_string(current_form);
            oldtree.appendChild(newnode);
        }else{
            activecalevt[caledit_select_oldval] = current_form.clone();
            if(current_form.datetime.getFullYear() == value_year &&
                current_form.datetime.getMonth() == value_month - 1 &&
                current_form.datetime.getDate() == value_date){
                document.getElementById("calselopt" + 
                    caledit_select_oldval.toString()).textContent = 
                    '<改> ' + generate_display_string(current_form);
            }else{
                document.getElementById("calselopt" + 
                    caledit_select_oldval.toString()).textContent = 
                    '<改> 其他日期';
            }
        }
        saved_form = current_form.clone();
        caledit_ismodified = true;
    });
    return false; /* 這樣才不會真的 submit */
}

function caledit_createoption(){
    var calselect = document.getElementById("caledit_select");
    var addoption = alldata[value_date].data;
    var newoption;
    var i;
    newoption = document.createElement("option");
    newoption.setAttribute("id", "caledit_newentry");
    newoption.value = "new";
    newoption.innerHTML = "新增活動......";
    calselect.appendChild(newoption);
    for(i=0; i<addoption.length; i++){
        newoption = document.createElement("option");
        newoption.setAttribute("id", "calselopt" + i.toString());
        newoption.value = i;
        newoption.textContent = generate_display_string(addoption[i]);
        calselect.appendChild(newoption);
        activecalevt.push(addoption[i].clone());
    }
}

function caledit_clearoption(){
    var calselect = document.getElementById("caledit_select");
    calselect.innerHTML = "";
}