/**
 * @constructor
 * @extends {RoomHistory}
 * @param {Room|string} room or roomId
 * @param {number} keepMessages number of messages to keep in memory
 * @param {Array|undefined} evts
 * @param {number|undefined} now
**/
function UiRoomHistory(room, keepMessages, evts, now) {
    RoomHistory.call(this, room, keepMessages, evts, now);
}
UiRoomHistory.prototype = Object.create(RoomHistory.prototype);
UiRoomHistory.prototype.constructor = UiRoomHistory;

UiRoomHistory.prototype.messageFactory = function(ev, ts) {
    if (ev["isMeMessage"] === true)
        return new UiMeMessage(this.id, ev, ts);
    if (ev["isNotice"] === true)
        return new UiNoticeMessage(this.id, ev, ts);
    return new UiMessage(this.id, ev, ts);
}

/** @interface */
function IUiMessage() {};

/**
 * @return {Element}
**/
IUiMessage.prototype.getDom = function() {};

/**
 * @return {IUiMessage}
**/
IUiMessage.prototype.removeDom = function() {};

/**
 * @return {IUiMessage}
**/
IUiMessage.prototype.invalidate = function() {};

/**
 * @return {IUiMessage}
**/
IUiMessage.prototype.createDom = function() {};

/**
 * @return {IUiMessage}
**/
IUiMessage.prototype.updateDom = function() {};

/**
 * @return {Element}
**/
IUiMessage.prototype.duplicateDom = function() {};

/** @const */
var AbstractUiMessage = (function() {
    var updateReactions = function(_this, channelId) {
        var reactionFrag = document.createDocumentFragment();

        if (_this.reactions) {
            for (var reaction in _this.reactions) {
                var reac = createReactionDom(channelId, _this.id, reaction, _this.reactions[reaction]);
                if (reac)
                    reactionFrag.appendChild(reac);
            }
        }
        _this.dom.reactions.textContent = '';
        _this.dom.reactions.appendChild(reactionFrag);
    },

    updateAttachments = function(_this, channelId) {
        var attachmentFrag = document.createDocumentFragment();

        for (var i =0, nbAttachments = _this.attachments.length; i < nbAttachments; i++) {
            var attachment = _this.attachments[i];
            if (attachment) {
                var domAttachment = createAttachmentDom(channelId, _this, attachment, i);
                if (domAttachment)
                    attachmentFrag.appendChild(domAttachment);
            }
        }
        _this.dom.attachments.textContent = '';
        _this.dom.attachments.appendChild(attachmentFrag);
    },

    updateCommon = function(_this, sender) {
        _this.dom.ts.innerHTML = locale.formatDate(_this.ts);
        _this.dom.textDom.innerHTML = formatText(_this.text);
        _this.dom.authorName.textContent = sender ? sender.name : (_this.username || "?");
    };

    return {
        /** @type {Element|null} *
        dom: null,

        /** @type {boolean} *
        uiNeedRefresh: true,
        */

        /** @param {IUiMessage} _this */
        invalidate: function(_this) {
            _this.uiNeedRefresh = true;
            return _this;
        },

        /** @param {UiMessage|UiMeMessage|UiNoticeMessage} _this */
        removeDom: function(_this) {
            if (_this.dom && _this.dom.parentElement) {
                _this.dom.remove();
                delete(_this.dom);
            }
            return _this;
        },

        /** @param {UiMessage|UiMeMessage|UiNoticeMessage} _this */
        getDom: function(_this) {
            if (!_this.dom) {
                _this.createDom().updateDom();

            } else if (_this.uiNeedRefresh) {
                _this.uiNeedRefresh = false;
                _this.updateDom();
            }
            return _this.dom;
        },

        /** @param {UiMessage|UiMeMessage|UiNoticeMessage} _this */
        updateDom: function(_this) {
            var sender = SLACK.context.users[_this.userId];

            updateCommon(_this, sender);
            updateAttachments(_this, _this.channelId);
            updateReactions(_this, _this.channelId);
            if (_this.edited)
                _this.dom.classList.add(R.klass.msg.editedStatus);
            return _this;
        },

        duplicateDom: function(_this) {
            return _this.dom.cloneNode(true);
        }
    };
})();

/**
 * @constructor
 * @implements {IUiMessage}
 * @extends {MeMessage}
 * @param {*} ev
 * @param {number} ts
**/
function UiMeMessage(channelId, ev, ts) {
    // Extends AbstractUiMessage and MeMessage
    MeMessage.call(this, ev, ts);

    /** @type {string} @const */
    this.channelId = channelId;
    this.dom = AbstractUiMessage.dom;
    this.uiNeedRefresh = AbstractUiMessage.uiNeedRefresh;
}
UiMeMessage.prototype = Object.create(MeMessage.prototype);
UiMeMessage.prototype.constructor = UiMeMessage;

UiMeMessage.prototype.invalidate = function() {
    return AbstractUiMessage.invalidate(this);
};

UiMeMessage.prototype.removeDom = function() {
    return AbstractUiMessage.removeDom(this);
};

UiMeMessage.prototype.getDom = function() {
    return AbstractUiMessage.getDom(this);
};

UiMeMessage.prototype.createDom = function() {
    this.dom = doCreateMessageDom(this, false);
    this.dom.classList.add(R.klass.msg.meMessage);
    return this;
};

UiMeMessage.prototype.duplicateDom = function() {
    return AbstractUiMessage.duplicateDom(this);
};

UiMeMessage.prototype.updateDom = function() {
    AbstractUiMessage.updateDom(this);
    return this;
};

UiMeMessage.prototype.update = function(ev, ts) {
    MeMessage.prototype.update.call(this, ev, ts);
    this.invalidate();
};

/**
 * @constructor
 * @implements {IUiMessage}
 * @extends {Message}
 * @param {*} ev
 * @param {number} ts
**/
function UiMessage(channelId, ev, ts) {
    // Extends AbstractUiMessage and Message
    Message.call(this, ev, ts);

    /** @type {string} @const */
    this.channelId = channelId;
    /** @type {Element} */
    this.dom = AbstractUiMessage.dom;
    /** @type {boolean} */
    this.uiNeedRefresh = AbstractUiMessage.uiNeedRefresh;
}
UiMessage.prototype = Object.create(Message.prototype);
UiMessage.prototype.constructor = UiMessage;

UiMessage.prototype.invalidate = function() {
    return AbstractUiMessage.invalidate(this);
};

UiMessage.prototype.removeDom = function() {
    return AbstractUiMessage.removeDom(this);
};

UiMessage.prototype.getDom = function() {
    return AbstractUiMessage.getDom(this);
};

UiMessage.prototype.createDom = function() {
    this.dom = doCreateMessageDom(this, false);
    return this;
};

UiMessage.prototype.duplicateDom = function() {
    return AbstractUiMessage.duplicateDom(this);
};

UiMessage.prototype.updateDom = function() {
    AbstractUiMessage.updateDom(this);
    return this;
};

UiMessage.prototype.update = function(ev, ts) {
    Message.prototype.update.call(this, ev, ts);
    this.invalidate();
};

/**
 * @constructor
 * @implements {IUiMessage}
 * @extends {NoticeMessage}
 * @param {*} ev
 * @param {number} ts
**/
function UiNoticeMessage(channelId, ev, ts) {
    // Extends AbstractUiMessage and NoticeMessage
    NoticeMessage.call(this, ev, ts);

    /** @type {string} @const */
    this.channelId = channelId;
    this.dom = AbstractUiMessage.dom;
    /** @type {Element} */
    this.domWrapper = null;
    this.uiNeedRefresh = AbstractUiMessage.uiNeedRefresh;
}
UiNoticeMessage.prototype = Object.create(NoticeMessage.prototype);
UiNoticeMessage.prototype.constructor = UiNoticeMessage;

UiNoticeMessage.prototype.invalidate = function() {
    return AbstractUiMessage.invalidate(this);
};

UiNoticeMessage.prototype.removeDom = function() {
    if (this.domWrapper && this.domWrapper.parentElement) {
        this.domWrapper.remove();
        delete(this.domWrapper);
    }
    if (this.dom)
        delete(this.dom);
    return this;
};

UiNoticeMessage.prototype.getDom = function() {
    AbstractUiMessage.getDom(this);
    return this.domWrapper;
};

UiNoticeMessage.prototype.duplicateDom = function() {
    return this.domWrapper.cloneNode(true);
};

UiNoticeMessage.prototype.createDom = function() {
    this.dom = doCreateMessageDom(this, false);
    this.domWrapper = document.createElement("span");
    this.dom.classList.add(R.klass.msg.notice);
    this.domWrapper.className = R.klass.msg.notice;
    this.domWrapper.textContent = locale.onlyVisible;
    return this;
};

UiNoticeMessage.prototype.updateDom = function() {
    AbstractUiMessage.updateDom(this);
    return this;
};

UiNoticeMessage.prototype.update = function(ev, ts) {
    NoticeMessage.prototype.update.call(this, ev, ts);
    this.invalidate();
};