/*
Copyright 2015, 2016 OpenMarket Ltd

Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
var React = require('react');
import { _t } from '../../../languageHandler';
var classNames = require('classnames');
var Matrix = require("matrix-js-sdk");
import Promise from 'bluebird';
var MatrixClientPeg = require("../../../MatrixClientPeg");
var Modal = require("../../../Modal");
var Entities = require("../../../Entities");
var sdk = require('../../../index');
var GeminiScrollbar = require('react-gemini-scrollbar');
var rate_limited_func = require('../../../ratelimitedfunc');
var CallHandler = require("../../../CallHandler");
var Invite = require("../../../Invite");

var INITIAL_LOAD_NUM_MEMBERS = 30;

module.exports = React.createClass({
    displayName: 'MemberList',

    getInitialState: function() {
        var state = {
            members: [],
            // ideally we'd size this to the page height, but
            // in practice I find that a little constraining
            truncateAt: INITIAL_LOAD_NUM_MEMBERS,
            searchQuery: "",
        };
        if (!this.props.roomId) return state;
        var cli = MatrixClientPeg.get();
        var room = cli.getRoom(this.props.roomId);
        if (!room) return state;

        this.memberDict = this.getMemberDict();

        state.members = this.roomMembers();
        return state;
    },

    componentWillMount: function() {
        var cli = MatrixClientPeg.get();
        cli.on("RoomState.members", this.onRoomStateMember);
        cli.on("RoomMember.name", this.onRoomMemberName);
        cli.on("RoomState.events", this.onRoomStateEvent);
        cli.on("Room", this.onRoom); // invites
        // We listen for changes to the lastPresenceTs which is essentially
        // listening for all presence events (we display most of not all of
        // the information contained in presence events).
        cli.on("User.lastPresenceTs", this.onUserLastPresenceTs);
        // cli.on("Room.timeline", this.onRoomTimeline);
    },

    componentWillUnmount: function() {
        var cli = MatrixClientPeg.get();
        if (cli) {
            cli.removeListener("RoomState.members", this.onRoomStateMember);
            cli.removeListener("RoomMember.name", this.onRoomMemberName);
            cli.removeListener("RoomState.events", this.onRoomStateEvent);
            cli.removeListener("Room", this.onRoom);
            cli.removeListener("User.lastPresenceTs", this.onUserLastPresenceTs);
            // cli.removeListener("Room.timeline", this.onRoomTimeline);
        }

        // cancel any pending calls to the rate_limited_funcs
        this._updateList.cancelPendingCall();
    },

/*
    onRoomTimeline: function(ev, room, toStartOfTimeline, removed, data) {
        // ignore anything but real-time updates at the end of the room:
        // updates from pagination will happen when the paginate completes.
        if (toStartOfTimeline || !data || !data.liveEvent) return;

        // treat any activity from a user as implicit presence to update the
        // ordering of the list whenever someone says something.
        // Except right now we're not tiebreaking "active now" users in this way
        // so don't bother for now.
        if (ev.getSender()) {
            // console.log("implicit presence from " + ev.getSender());

            var tile = this.refs[ev.getSender()];
            if (tile) {
                // work around a race where you might have a room member object
                // before the user object exists.  XXX: why does this ever happen?
                var all_members = room.currentState.members;
                var userId = ev.getSender();
                if (all_members[userId].user === null) {
                    all_members[userId].user = MatrixClientPeg.get().getUser(userId);
                }
                this._updateList(); // reorder the membership list
            }
        }
    },
*/

    onUserLastPresenceTs(event, user) {
        // Attach a SINGLE listener for global presence changes then locate the
        // member tile and re-render it. This is more efficient than every tile
        // evar attaching their own listener.
        // console.log("explicit presence from " + user.userId);
        var tile = this.refs[user.userId];
        if (tile) {
            this._updateList(); // reorder the membership list
        }
    },

    onRoom: function(room) {
        if (room.roomId !== this.props.roomId) {
            return;
        }
        // We listen for room events because when we accept an invite
        // we need to wait till the room is fully populated with state
        // before refreshing the member list else we get a stale list.
        this._updateList();
    },

    onRoomStateMember: function(ev, state, member) {
        this._updateList();
    },

    onRoomMemberName: function(ev, member) {
        this._updateList();
    },

    onRoomStateEvent: function(event, state) {
        if (event.getType() === "m.room.third_party_invite") {
            this._updateList();
        }
    },

    _updateList: new rate_limited_func(function() {
        // console.log("Updating memberlist");
        this.memberDict = this.getMemberDict();

        var self = this;
        this.setState({
            members: self.roomMembers()
        });
    }, 500),

    getMemberDict: function() {
        if (!this.props.roomId) return {};
        var cli = MatrixClientPeg.get();
        var room = cli.getRoom(this.props.roomId);
        if (!room) return {};

        var all_members = room.currentState.members;

        Object.keys(all_members).map(function(userId) {
            // work around a race where you might have a room member object
            // before the user object exists.  This may or may not cause
            // https://github.com/vector-im/vector-web/issues/186
            if (all_members[userId].user === null) {
                all_members[userId].user = MatrixClientPeg.get().getUser(userId);
            }

            // XXX: this user may have no lastPresenceTs value!
            // the right solution here is to fix the race rather than leave it as 0
        });

        return all_members;
    },

    roomMembers: function() {
        var all_members = this.memberDict || {};
        var all_user_ids = Object.keys(all_members);
        var ConferenceHandler = CallHandler.getConferenceHandler();

        all_user_ids.sort(this.memberSort);

        var to_display = [];
        var count = 0;
        for (var i = 0; i < all_user_ids.length; ++i) {
            var user_id = all_user_ids[i];
            var m = all_members[user_id];

            if (m.membership == 'join' || m.membership == 'invite') {
                if ((ConferenceHandler && !ConferenceHandler.isConferenceUser(user_id)) || !ConferenceHandler) {
                    to_display.push(user_id);
                    ++count;
                }
            }
        }
        return to_display;
    },

    _createOverflowTile: function(overflowCount, totalCount) {
        // For now we'll pretend this is any entity. It should probably be a separate tile.
        var EntityTile = sdk.getComponent("rooms.EntityTile");
        var BaseAvatar = sdk.getComponent("avatars.BaseAvatar");
        var text = (overflowCount > 1)
        	? _t("and %(overflowCount)s others...", { overflowCount: overflowCount })
        	: _t("and one other...");
        return (
            <EntityTile className="mx_EntityTile_ellipsis" avatarJsx={
                <BaseAvatar url="img/ellipsis.svg" name="..." width={36} height={36} />
            } name={text} presenceState="online" suppressOnHover={true}
            onClick={this._showFullMemberList} />
        );
    },

    _showFullMemberList: function() {
        this.setState({
            truncateAt: -1
        });
    },

    memberString: function(member) {
        if (!member) {
            return "(null)";
        }
        else {
            return "(" + member.name + ", " + member.powerLevel + ", " + member.user.lastActiveAgo + ", " + member.user.currentlyActive + ")";
        }
    },

    // returns negative if a comes before b,
    // returns 0 if a and b are equivalent in ordering
    // returns positive if a comes after b.
    memberSort: function(userIdA, userIdB) {
            // order by last active, with "active now" first.
            // ...and then by power
            // ...and then alphabetically.
            // We could tiebreak instead by "last recently spoken in this room" if we wanted to.

            var memberA = this.memberDict[userIdA];
            var memberB = this.memberDict[userIdB];
            var userA = memberA.user;
            var userB = memberB.user;

            // if (!userA || !userB) {
            //     console.log("comparing " + memberA.name + " user=" + memberA.user + " with " + memberB.name + " user=" + memberB.user);
            // }

            if (!userA && !userB) return 0;
            if (userA && !userB) return -1;
            if (!userA && userB) return 1;

            // console.log("comparing " + this.memberString(memberA) + " and " + this.memberString(memberB));

            if (userA.currentlyActive && userB.currentlyActive) {
                // console.log(memberA.name + " and " + memberB.name + " are both active");
                if (memberA.powerLevel === memberB.powerLevel) {
                    // console.log(memberA + " and " + memberB + " have same power level");
                    if (memberA.name && memberB.name) {
                        // console.log("comparing names: " + memberA.name + " and " + memberB.name);
                        var nameA = memberA.name[0] === '@' ? memberA.name.substr(1) : memberA.name;
                        var nameB = memberB.name[0] === '@' ? memberB.name.substr(1) : memberB.name;
                        return nameA.localeCompare(nameB);
                    }
                    else {
                        return 0;
                    }
                }
                else {
                    // console.log("comparing power: " + memberA.powerLevel + " and " + memberB.powerLevel);
                    return memberB.powerLevel - memberA.powerLevel;
                }
            }

            if (userA.currentlyActive && !userB.currentlyActive) return -1;
            if (!userA.currentlyActive && userB.currentlyActive) return 1;

            // For now, let's just order things by timestamp. It's really annoying
            // that a user disappears from sight just because they temporarily go offline
            return userB.getLastActiveTs() - userA.getLastActiveTs();
    },

    onSearchQueryChanged: function(ev) {
        this.setState({ searchQuery: ev.target.value });
    },

    makeMemberTiles: function(membership, query) {
        var MemberTile = sdk.getComponent("rooms.MemberTile");
        query = (query || "").toLowerCase();

        var self = this;

        var memberList = self.state.members.filter(function(userId) {
            var m = self.memberDict[userId];

            if (query) {
                const matchesName = m.name.toLowerCase().indexOf(query) !== -1;
                const matchesId = m.userId.toLowerCase().indexOf(query) !== -1;

                if (!matchesName && !matchesId) {
                    return false;
                }
            }

            return m.membership == membership;
        }).map(function(userId) {
            var m = self.memberDict[userId];
            return (
                <MemberTile key={userId} member={m} ref={userId} />
            );
        });

        // XXX: surely this is not the right home for this logic.
        if (membership === "invite") {
            // include 3pid invites (m.room.third_party_invite) state events.
            // The HS may have already converted these into m.room.member invites so
            // we shouldn't add them if the 3pid invite state key (token) is in the
            // member invite (content.third_party_invite.signed.token)
            var room = MatrixClientPeg.get().getRoom(this.props.roomId);
            var EntityTile = sdk.getComponent("rooms.EntityTile");
            if (room) {
                room.currentState.getStateEvents("m.room.third_party_invite").forEach(
                function(e) {
                    // any events without these keys are not valid 3pid invites, so we ignore them
                    var required_keys = ['key_validity_url', 'public_key', 'display_name'];
                    for (var i = 0; i < required_keys.length; ++i) {
                        if (e.getContent()[required_keys[i]] === undefined) return;
                    }

                    // discard all invites which have a m.room.member event since we've
                    // already added them.
                    var memberEvent = room.currentState.getInviteForThreePidToken(e.getStateKey());
                    if (memberEvent) {
                        return;
                    }
                    memberList.push(
                        <EntityTile key={e.getStateKey()} name={e.getContent().display_name} />
                    );
                });
            }
        }

        return memberList;
    },

    render: function() {
        var invitedSection = null;
        var invitedMemberTiles = this.makeMemberTiles('invite', this.state.searchQuery);
        if (invitedMemberTiles.length > 0) {
            invitedSection = (
                <div className="mx_MemberList_invited">
                    <h2>{ _t("Invited") }</h2>
                    <div className="mx_MemberList_wrapper">
                        {invitedMemberTiles}
                    </div>
                </div>
            );
        }

        var inputBox = (
            <form autoComplete="off">
                <input className="mx_MemberList_query" id="mx_MemberList_query" type="text"
                        onChange={this.onSearchQueryChanged} value={this.state.searchQuery}
                        placeholder={ _t('Filter room members') } />
            </form>
        );

        var TruncatedList = sdk.getComponent("elements.TruncatedList");
        return (
            <div className="mx_MemberList">
                { inputBox }
                <GeminiScrollbar autoshow={true} className="mx_MemberList_joined mx_MemberList_outerWrapper">
                    <TruncatedList className="mx_MemberList_wrapper" truncateAt={this.state.truncateAt}
                            createOverflowElement={this._createOverflowTile}>
                        {this.makeMemberTiles('join', this.state.searchQuery)}
                    </TruncatedList>
                    {invitedSection}
                </GeminiScrollbar>
            </div>
        );
    }
});