/* -*- Mode: javascript; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* exported initLocationPage, initCustomizePage, onSelectProvider,
 *          onInitialAdvance, doCreateCalendar, setCanRewindFalse
 */

Components.utils.import("resource://calendar/modules/calUtils.jsm");

var gCalendar;

var errorConstants = {
    SUCCESS: 0,
    INVALID_URI: 1,
    ALREADY_EXISTS: 2
};

var l10nStrings = {};
l10nStrings[errorConstants.SUCCESS] = "";
l10nStrings[errorConstants.INVALID_URI] = cal.calGetString("calendarCreation", "error.invalidUri");
l10nStrings[errorConstants.ALREADY_EXISTS] = cal.calGetString("calendarCreation", "error.alreadyExists");

/**
 * Initialize the location page
 */
function initLocationPage() {
    checkRequired();
}

/**
 * Initialize the customize page
 */
function initCustomizePage() {
    initNameFromURI();
    checkRequired();

    let suppressAlarmsRow = document.getElementById("customize-suppressAlarms-row");
    suppressAlarmsRow.hidden =
        gCalendar && gCalendar.getProperty("capabilities.alarms.popup.supported") === false;
    document.getElementById("calendar-color").value = "#A8C2E1";
}

/**
 * Sets up notifications for the location page. On aReason == SUCCESS, all
 * notifications are removed. Otherwise, the respective notification is added to
 * the notification box. Only one notification per reason will be shown.
 *
 * @param aReason           The reason of notification, one of |errorConstants|.
 */
function setNotification(aReason) {
    let notificationBox = document.getElementById("location-notifications");

    if (aReason == errorConstants.SUCCESS) {
        notificationBox.removeAllNotifications();
    } else {
        let existingBox = notificationBox.getNotificationWithValue(aReason);
        if (!existingBox) {
            notificationBox.appendNotification(l10nStrings[aReason],
                                               aReason,
                                               null,
                                               notificationBox.PRIORITY_WARNING_MEDIUM,
                                               null);
            notificationBox.getNotificationWithValue(aReason).setAttribute("hideclose", "true");
        }
    }
}

/**
 * Called when a provider is selected in the network calendar list. Makes sure
 * the page is set up for the provider.
 *
 * @param type      The provider type selected
 */
function onSelectProvider(type) {
    let cache = document.getElementById("cache");
    let tempCal;
    try {
        tempCal = Components.classes["@mozilla.org/calendar/calendar;1?type=" + type]
                            .createInstance(Components.interfaces.calICalendar);
    } catch (e) {
        // keep tempCal undefined if the calendar can not be created
    }

    if (tempCal && tempCal.getProperty("cache.always")) {
        cache.oldValue = cache.checked;
        cache.checked = true;
        cache.disabled = true;
    } else {
        if (cache.oldValue !== undefined) {
            cache.checked = cache.oldValue;
            cache.oldValue = undefined;
        }
        cache.disabled = false;
    }
}

/**
 * Checks if the required information is set so that the wizard can advance. On
 * an error, notifications are shown and the wizard can not be advanced.
 */
function checkRequired() {
    let canAdvance = true;
    let curPage = document.getElementById("calendar-wizard").currentPage;
    if (curPage) {
        let eList = curPage.getElementsByAttribute("required", "true");
        for (let i = 0; i < eList.length && canAdvance; ++i) {
            canAdvance = (eList[i].value != "");
        }

        let notificationbox = document.getElementById("location-notifications");
        if (canAdvance && document.getElementById("calendar-uri").value &&
            curPage.pageid == "locationPage") {
            // eslint-disable-next-line array-bracket-spacing
            let [reason, ] = parseUri(document.getElementById("calendar-uri").value);
            canAdvance = (reason == errorConstants.SUCCESS);
            setNotification(reason);
        } else {
            notificationbox.removeAllNotifications();
        }
        document.getElementById("calendar-wizard").canAdvance = canAdvance;
    }
}

/**
 * Handler function called when the advance button is pressed on the initial
 * wizard page
 */
function onInitialAdvance() {
    let type = document.getElementById("calendar-type").selectedItem.value;
    let page = document.getElementsByAttribute("pageid", "initialPage")[0];
    if (type == "local") {
        prepareCreateCalendar();
        page.next = "customizePage";
    } else {
        page.next = "locationPage";
    }
}

/**
 * Create the calendar, so that the customize page can already check for
 * calendar capabilities of the provider.
 */
function prepareCreateCalendar() {
    gCalendar = null;

    let provider;
    let url;
    let reason;
    let type = document.getElementById("calendar-type").selectedItem.value;
    if (type == "local") {
        provider = "storage";
        [reason, url] = parseUri("moz-storage-calendar://");
    } else {
        provider = document.getElementById("calendar-format").selectedItem.value;
        [reason, url] = parseUri(document.getElementById("calendar-uri").value);
    }

    if (reason != errorConstants.SUCCESS || !url) {
        return false;
    }

    try {
        gCalendar = cal.getCalendarManager().createCalendar(provider, url);
    } catch (ex) {
        dump(ex);
        return false;
    }

    return true;
}

/**
 * The actual process of registering the created calendar.
 */
function doCreateCalendar() {
    let cal_name = document.getElementById("calendar-name").value;
    let cal_color = document.getElementById("calendar-color").value;

    gCalendar.name = cal_name;
    gCalendar.setProperty("color", cal_color);
    if (!gCalendar.getProperty("cache.always")) {
        gCalendar.setProperty("cache.enabled", gCalendar.getProperty("cache.supported") === false
                                               ? false : document.getElementById("cache").checked);
    }

    if (!document.getElementById("fire-alarms").checked) {
        gCalendar.setProperty("suppressAlarms", true);
    }

    cal.getCalendarManager().registerCalendar(gCalendar);
    return true;
}

/**
 * Initializes the calendar name from its uri
 */
function initNameFromURI() {
    let path = document.getElementById("calendar-uri").value;
    let nameField = document.getElementById("calendar-name");
    if (!path || nameField.value) {
        return;
    }

    let fullPathRegex = new RegExp("([^/:]+)[.]ics$");
    let captures = path.match(fullPathRegex);
    if (captures && captures.length >= 1) {
        nameField.value = decodeURIComponent(captures[1]);
    }
}

/**
 * Parses the given uri value to check if it is valid and there is not already
 * a calendar with this uri.
 *
 * @param aUri              The string to parse as an uri.
 * @return [error, uri]     |error| is the error code from errorConstants,
 *                          |uri| the parsed nsIURI, or null on error.
 */
function parseUri(aUri) {
    let uri;
    try {
        // Test if the entered uri can be parsed.
        uri = makeURL(aUri);
    } catch (ex) {
        return [errorConstants.INVALID_URI, null];
    }

    let calManager = cal.getCalendarManager();
    let cals = calManager.getCalendars({});
    let type = document.getElementById("calendar-type").selectedItem.value;
    if (type != "local" && cals.some(calendar => calendar.uri.spec == uri.spec)) {
        // If the calendar is not local, we check if there is already a calendar
        // with the same uri spec. Storage calendars all have the same uri, so
        // we have to specialcase them.
        return [errorConstants.ALREADY_EXISTS, null];
    }

    return [errorConstants.SUCCESS, uri];
}

/**
 * Disables the back button, in case we are far enough that its not possible to
 * undo.
 */
function setCanRewindFalse() {
    document.getElementById("calendar-wizard").canRewind = false;
}
