/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Lightning code.
 *
 * The Initial Developer of the Original Code is Simdesk Technologies Inc.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Clint Talbert <ctalbert.moz@gmail.com>
 *   Matthew Willis <lilmatt@mozilla.com>
 *   Philipp Kewisch <mozilla@kewis.ch>
 *   Daniel Boelzle <daniel.boelzle@sun.com>
 *   Martin Schroeder <mschroeder@mozilla.x-home.org>
 *   Simon Vaillancourt <simon.at.orcl@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

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

/**
 * This bar lives inside the message window.
 * Its lifetime is the lifetime of the main thunderbird message window.
 */

function ltnGetMsgRecipient() {
    let msgHdr = gMessageDisplay.displayedMessage;
    if (!msgHdr) {
        return null;
    }

    var identities;
    if (msgHdr.accountKey) {
        // First, check if the message has an account key. If so, we can use the
        // account identities to find the correct recipient
        identities = getAccountManager().getAccount(msgHdr.accountKey).identities;
    } else {
        // Without an account key, we have to revert back to using the server
        identities = getAccountManager().GetIdentitiesForServer(msgHdr.folder.server);
    }

    var emailMap = {};
    if (identities.Count() == 0) {
        // If we were not able to retrieve identities above, then we have no
        // choice but to revert to the default identity
        var identity = getAccountManager().defaultAccount.defaultIdentity;
        if (!identity) {
            // If there isn't a default identity (i.e Local Folders is your
            // default identity), then go ahead and use the first available
            // identity.
            var allIdentities = getAccountManager().allIdentities;
            if (allIdentities.Count() > 0) {
                identity = allIdentities.GetElementAt(0)
                                        .QueryInterface(Components.interfaces.nsIMsgIdentity);
            } else {
                // If there are no identities at all, we cannot get a recipient.
                return null;
            }
        }
        emailMap[identity.email.toLowerCase()] = true;
    } else {
        // Build a map of usable email addresses
        for (var i = 0; i < identities.Count(); i++) {
            var identity = identities.GetElementAt(i)
                                     .QueryInterface(Components.interfaces.nsIMsgIdentity);
            emailMap[identity.email.toLowerCase()] = true;
        }
    }


    var hdrParser = Components.classes["@mozilla.org/messenger/headerparser;1"]
                              .getService(Components.interfaces.nsIMsgHeaderParser);
    var emails = {};

    // First check the recipient list
    hdrParser.parseHeadersWithArray(msgHdr.recipients, emails, {}, {});
    for each (var recipient in emails.value) {
        if (emailMap[recipient.toLowerCase()]) {
            // Return the first found recipient
            return recipient;
        }
    }

    // Maybe we are in the CC list?
    hdrParser.parseHeadersWithArray(msgHdr.ccList, emails, {}, {});
    for each (var recipient in emails.value) {
        if (emailMap[recipient.toLowerCase()]) {
            // Return the first found recipient
            return recipient;
        }
    }

    // Hrmpf. Looks like delegation or maybe Bcc.
    return null;
}

function ltnIsSchedulingCalendar(cal) {
    return (isCalendarWritable(cal) &&
            cal.getProperty("organizerId") &&
            cal.getProperty("itip.transport"));
}

const ltnOnItipItem = {
    observe: function ltnOnItipItem_observe(subject, topic, state) {
        if (topic == "onItipItemCreation") {
            let itipItem = null;
            try {
                if (!subject) {
                    let sinkProps = msgWindow.msgHeaderSink.properties;
                    // This property was set by lightningTextCalendarConverter.js
                    itipItem = sinkProps.getPropertyAsInterface("itipItem", Components.interfaces.calIItipItem);
                }
            } catch (e) {
                // This will throw on every message viewed that doesn't have the
                // itipItem property set on it. So we eat the errors and move on.

                // XXX TODO: Only swallow the errors we need to. Throw all others.
            }
            if (!itipItem) {
                return;
            }

            // Get the recipient identity and save it with the itip item.
            itipItem.identity = ltnGetMsgRecipient();

            // We are only called upon receipt of an invite, so ensure that isSend
            // is false.
            itipItem.isSend = false;

            // XXX Get these from preferences
            itipItem.autoResponse = Components.interfaces.calIItipItem.USER;

            let imipMethod = gMessageDisplay.displayedMessage.getStringProperty("imip_method");
            if (imipMethod && imipMethod.length != 0 && imipMethod.toLowerCase() != "nomethod") {
                itipItem.receivedMethod = imipMethod.toUpperCase();
            } else { // There is no METHOD in the content-type header (spec violation).
                     // Fall back to using the one from the itipItem's ICS.
                imipMethod = itipItem.receivedMethod;
            }
            cal.LOG("iTIP method: " + imipMethod);

            let writableCalendars = getCalendarManager().getCalendars({}).filter(ltnIsSchedulingCalendar);
            if (writableCalendars.length > 0) {
                let compCal = Components.classes["@mozilla.org/calendar/calendar;1?type=composite"]
                                        .createInstance(Components.interfaces.calICompositeCalendar);
                writableCalendars.forEach(compCal.addCalendar, compCal);
                itipItem.targetCalendar = compCal;

                let imipBar = document.getElementById("imip-bar");
                imipBar.setAttribute("collapsed", "false");
                switch (itipItem.receivedMethod) {
                    case "REFRESH":
                        imipBar.setAttribute("label", ltnGetString("lightning", "imipBarRefreshText"));
                        break;
                    case "REQUEST":
                        imipBar.setAttribute("label", ltnGetString("lightning", "imipBarRequestText"));
                        break;
                    case "PUBLISH":
                        imipBar.setAttribute("label", ltnGetString("lightning", "imipBarPublishText"));
                        break;
                    case "CANCEL":
                        imipBar.setAttribute("label", ltnGetString("lightning", "imipBarCancelText"));
                        break;
                    case "REPLY":
                        imipBar.setAttribute("label", ltnGetString("lightning", "imipBarReplyText"));
                        break;
                    default:
                        // Bug xxxx TBD: Something went wrong or we found a message we don't
                        // support yet. We can show a "This method is not supported in this
                        // version" or simply hide the iMIP bar at this point
                        imipBar.setAttribute("label", ltnGetString("lightning", "imipBarUnsupportedText"));
                        cal.ERROR("Unknown iTIP method: " + itipItem.receivedMethod);
                        return;
                }
                cal.itip.processItipItem(itipItem, ltnItipOptions);
            }
        }
    }
};

/**
 * Add self to gMessageListeners defined in msgHdrViewOverlay.js
 */
function ltnImipOnLoad() {
    let listener = {
        onStartHeaders: function onImipStartHeaders() {
            var imipBar = document.getElementById("imip-bar");
            imipBar.setAttribute("collapsed", "true");
            hideElement("imip-button1");
            hideElement("imip-button2");
            hideElement("imip-button3");
            // A new message is starting.
            // Clear our iMIP/iTIP stuff so it doesn't contain stale information.
            gItipItem = null;
        },
        onEndHeaders: function onImipEndHeaders() {
        }
    };
    gMessageListeners.push(listener);

    // Set up our observers
    cal.getObserverService().addObserver(ltnOnItipItem, "onItipItemCreation", false);
}

function ltnImipOnUnload() {
    removeEventListener("messagepane-loaded", ltnImipOnLoad, true);
    removeEventListener("messagepane-unloaded", ltnImipOnUnload, true);

    gItipItem = null;
    cal.getObserverService().removeObserver(ltnOnItipItem, "onItipItemCreation");
}

addEventListener("messagepane-loaded", ltnImipOnLoad, true);
addEventListener("messagepane-unloaded", ltnImipOnUnload, true);

var gItipItem = null;
var gActionFunc = null;

function ltnExecAction(partStat) {
    switch (gActionFunc.method) {
        // methods that don't require the calendar chooser:
        case "REFRESH":
        case "REQUEST:UPDATE":
        case "REQUEST:UPDATE-MINOR":
        case "PUBLISH:UPDATE":
        case "REPLY":
        case "CANCEL":
            break;
        default: {
            let cal = ltnGetTargetCalendar(gItipItem);
            if (!cal) {
                return true; // cancelled
            }
            gItipItem.targetCalendar = cal;
            break;
        }
    }

    // hide the buttons now, to disable pressing them twice...
    hideElement("imip-button1");
    hideElement("imip-button2");
    hideElement("imip-button3");

    let opListener = {
        onOperationComplete: function ltnItipActionListener_onOperationComplete(aCalendar,
                                                                                aStatus,
                                                                                aOperationType,
                                                                                aId,
                                                                                aDetail) {
            // For now, we just state the status for the user something very simple
            let imipBar = document.getElementById("imip-bar");
            if (Components.isSuccessCode(aStatus)) {
                switch (aOperationType) {
                    case Components.interfaces.calIOperationListener.ADD:
                        imipBar.setAttribute("label", ltnGetString("lightning", "imipAddedItemToCal"));
                        break;
                    case Components.interfaces.calIOperationListener.MODIFY:
                        imipBar.setAttribute("label", ltnGetString("lightning", "imipUpdatedItem"));
                        break;
                    case Components.interfaces.calIOperationListener.DELETE:
                        imipBar.setAttribute("label", ltnGetString("lightning", "imipCanceledItem"));
                        break;
                }
            } else {
                let msg = ltnGetString("lightning", "imipBarProcessingFailed", [aStatus.toString(16)]);
                imipBar.setAttribute("label", msg);
                showError(msg);
            }
        },
        onGetResult: function ltnItipActionListener_onGetResult(aCalendar,
                                                                aStatus,
                                                                aItemType,
                                                                aDetail,
                                                                aCount,
                                                                aItems) {
        }
    };

    try {
        gActionFunc(opListener, partStat);
    } catch (exc) {
        Components.utils.reportError(exc);
    }

    return true;
}

function ltnItipOptions(itipItem, rc, actionFunc) {
    var imipBar = document.getElementById("imip-bar");
    if (Components.isSuccessCode(rc)) {
        if (!actionFunc) {
            // This case, they clicked on an old message that has already been
            // added/updated, we want to tell them that.
            imipBar.setAttribute("label", ltnGetString("lightning", "imipBarAlreadyProcessedText"));
            return;
        }

        gItipItem = itipItem;
        gActionFunc = actionFunc;

        let button1 = document.getElementById("imip-button1");
        let button2 = document.getElementById("imip-button2");
        let button3 = document.getElementById("imip-button3");
        cal.LOG("iTIP options on: " + actionFunc.method);
        switch (actionFunc.method) {
            case "REPLY":
                // fall-thru intended
            case "PUBLISH:UPDATE":
            case "REQUEST:UPDATE-MINOR":
                imipBar.setAttribute("label", ltnGetString("lightning", "imipBarUpdateText"));
                button1.setAttribute("label", ltnGetString("lightning", "imipUpdate.label"));
                button1.setAttribute("oncommand", "return ltnExecAction();");
                showElement(button1);
                break;
            case "PUBLISH":
                button1.setAttribute("label", ltnGetString("lightning", "imipAddToCalendar.label"));
                button1.setAttribute("oncommand", "return ltnExecAction();");
                showElement(button1);
                break;
            case "REQUEST:UPDATE":
                imipBar.setAttribute("label", ltnGetString("lightning", "imipBarUpdateText"));
                // fall-thru intended
            case "REQUEST": {
                button1.setAttribute("label", ltnGetString("lightning", "imipAcceptInvitation.label"));
                button1.setAttribute("oncommand", "return ltnExecAction('ACCEPTED');");
                button2.setAttribute("label", ltnGetString("lightning", "imipDeclineInvitation.label"));
                button2.setAttribute("oncommand", "return ltnExecAction('DECLINED');");
                button3.setAttribute("label", ltnGetString("lightning", "imipAcceptTentativeInvitation.label"));
                button3.setAttribute("oncommand", "return ltnExecAction('TENTATIVE');");
                showElement(button1);
                showElement(button2);
                showElement(button3);
                break;
            }
            case "CANCEL": {
                button1.setAttribute("label", ltnGetString("lightning", "imipCancelInvitation.label"));
                button1.setAttribute("oncommand", "return ltnExecAction();");
                showElement(button1);
                break;
            }
            case "REFRESH": {
                button1.setAttribute("label", ltnGetString("lightning", "imipSend.label"));
                button1.setAttribute("oncommand", "return ltnExecAction();");
                showElement(button1);
                break;
            }
            default:
                imipBar.setAttribute("label", ltnGetString("lightning", "imipBarUnsupportedText"));
                break;
        }
    } else {
        imipBar.setAttribute("label", ltnGetString("lightning", "imipBarUnsupportedText"));
    }
}

function ltnGetTargetCalendar(itipItem) {
    let calendarToReturn = null;
    let calendars = getCalendarManager().getCalendars({}).filter(ltnIsSchedulingCalendar);

    if (itipItem.receivedMethod == "REQUEST") {
        // try to further limit down the list to those calendars that are configured to a matching attendee;
        let item = itipItem.getItemList({})[0];
        let matchingCals = calendars.filter(
            function(calendar) {
                return (cal.getInvitedAttendee(item, calendar) != null);
            });
        // if there's none, we will show the whole list of calendars:
        if (matchingCals.length > 0) {
            calendars = matchingCals;
        }
    }

    if (calendars.length == 0) {
        var stringBundle = getLightningStringBundle();
        window.alert(stringBundle.GetStringFromName("imipNoCalendarAvailable"));
    }
    else if (calendars.length == 1) {
        // There's only one calendar, so it's silly to ask what calendar
        // the user wants to import into.
        calendarToReturn = calendars[0];
    } else {
        // Ask what calendar to import into
        var args = {};
        args.calendars = calendars;
        args.onOk = function selectCalendar(aCal) { calendarToReturn = aCal; };
        args.promptText = calGetString("calendar", "importPrompt");
        openDialog("chrome://calendar/content/chooseCalendarDialog.xul",
                   "_blank", "chrome,titlebar,modal,resizable", args);
    }

    return calendarToReturn;
}
