/*
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');
var classNames = require('classnames');
var Matrix = require("matrix-js-sdk");
var q = require('q');
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 INITIAL_LOAD_NUM_MEMBERS = 30;
var SHARE_HISTORY_WARNING =
    <span>
        Newly invited users will see the history of this room. <br/>
        If you'd prefer invited users not to see messages that were sent before they joined, <br/>
        turn off, 'Share message history with new users' in the settings for this room.
    </span>

var shown_invite_warning_this_session = false;
// global promise so people can bulk invite and they all get resolved
var invite_defer = q.defer();

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,
        };
        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(INITIAL_LOAD_NUM_MEMBERS);
        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
        cli.on("User.presence", this.onUserPresence);
        // 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.presence", this.onUserPresence);
            // cli.removeListener("Room.timeline", this.onRoomTimeline);
        }
    },

    componentDidMount: function() {
        var self = this;

        // Lazy-load in more than the first N members
        setTimeout(function() {
            if (!self.isMounted()) return;
            // lazy load to prevent it blocking the first render
            self.setState({
                members: self.roomMembers()
            });
        }, 50);
    },

/*
    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
            }
        }
    },
*/

    onUserPresence(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),

    onInvite: function(inputText) {
        var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
        var NeedToRegisterDialog = sdk.getComponent("dialogs.NeedToRegisterDialog");
        var self = this;
        inputText = inputText.trim(); // react requires es5-shim so we know trim() exists

        if (MatrixClientPeg.get().isGuest()) {
            Modal.createDialog(NeedToRegisterDialog, {
                title: "Unable to Invite",
                description: "Guest user can't invite new users. Please register to be able to invite new users into a room."
            });
            return;
        }

        // email addresses and user IDs do not allow space, comma, semicolon so split
        // on them for bulk inviting.
        var separators =[ ";", " ", "," ];
        for (var i = 0; i < separators.length; i++) {
            if (inputText.indexOf(separators[i]) >= 0) {
                var inputs = inputText.split(separators[i]);
                inputs.forEach(function(input) {
                    self.onInvite(input);
                });
                return;
            }
        }

        var isEmailAddress = /^\S+@\S+\.\S+$/.test(inputText);

        // sanity check the input for user IDs
        if (!isEmailAddress && (inputText[0] !== '@' || inputText.indexOf(":") === -1)) {
            console.error("Bad ID to invite: %s", inputText);
            Modal.createDialog(ErrorDialog, {
                title: "Invite Error",
                description: "Malformed ID. Should be an email address or a Matrix ID like '@localpart:domain'"
            });
            return;
        }

        var inviteWarningDefer = q.defer();

        var room = MatrixClientPeg.get().getRoom(this.props.roomId);
        var history_visibility = room.currentState.getStateEvents('m.room.history_visibility', '');
        if (history_visibility) history_visibility = history_visibility.getContent().history_visibility;

        if (history_visibility == 'shared' && !shown_invite_warning_this_session) {
            inviteWarningDefer = invite_defer; // whether we continue depends on this defer
            var QuestionDialog = sdk.getComponent("dialogs.QuestionDialog");
            Modal.createDialog(QuestionDialog, {
                title: "Warning",
                description: SHARE_HISTORY_WARNING,
                button: "Invite",
                onFinished: function(should_invite) {
                    if (should_invite) {
                        shown_invite_warning_this_session = true;
                        invite_defer.resolve();
                    } else {
                        invite_defer.reject(null);
                        // reset the promise so we don't auto-reject all invites from
                        // now on.
                        invite_defer = q.defer();
                    }
                }
            });
        } else {
            inviteWarningDefer.resolve();
        }

        var promise = inviteWarningDefer.promise;
        if (isEmailAddress) {
            promise = promise.then(function() {
                 return MatrixClientPeg.get().inviteByEmail(self.props.roomId, inputText);
            });
        }
        else {
            promise = promise.then(function() {
                return MatrixClientPeg.get().invite(self.props.roomId, inputText);
            });
        }

        self.setState({
            inviting: true
        });
        console.log(
            "Invite %s to %s - isEmail=%s", inputText, this.props.roomId, isEmailAddress
        );
        promise.then(function(res) {
            console.log("Invited %s", inputText);
        }, function(err) {
            if (err !== null) {
                console.error("Failed to invite: %s", JSON.stringify(err));
                if (err.errcode == 'M_FORBIDDEN') {
                    Modal.createDialog(ErrorDialog, {
                        title: "Unable to Invite",
                        description: "You do not have permission to invite people to this room."
                    });
                } else {
                    Modal.createDialog(ErrorDialog, {
                        title: "Server error whilst inviting",
                        description: err.message
                    });
                }
            }
        }).finally(function() {
            self.setState({
                inviting: false
            });
            // XXX: hacky focus on the invite box
            setTimeout(function() {
                var inviteBox = document.getElementById("mx_SearchableEntityList_query");
                if (inviteBox) {
                    inviteBox.focus();
                }
            }, 0);
        });
    },

    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(limit) {
        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 && (limit === undefined || count < limit); ++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 = "and " + overflowCount + " other" + (overflowCount > 1 ? "s" : "") +  "...";
        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 -1 if a < b.
    // 0 if a and b are equivalent
    // 1 if a > 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);
                        return memberA.name.localeCompare(memberB.name);
                    }
                    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
    /*
            var presenceMap = {
                online: 3,
                unavailable: 2,
                offline: 1
            };

            var presenceOrdA = userA ? presenceMap[userA.presence] : 0;
            var presenceOrdB = userB ? presenceMap[userB.presence] : 0;

            if (presenceOrdA != presenceOrdB) {
                return presenceOrdB - presenceOrdA;
            }
    */

            var lastActiveTsA = userA && userA.lastActiveAgo ? (userA.lastPresenceTs - userA.lastActiveAgo) : Number.MAX_SAFE_INTEGER;
            var lastActiveTsB = userB && userB.lastActiveAgo ? (userB.lastPresenceTs - userB.lastActiveAgo) : Number.MAX_SAFE_INTEGER;

            // console.log("comparing ts: " + lastActiveTsA + " and " + lastActiveTsB);

            return lastActiveTsA - lastActiveTsB;
        }
    },

    onSearchQueryChanged: function(input) {
        this.setState({
            searchQuery: input
        });
    },

    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 && m.name.toLowerCase().indexOf(query) === -1) {
                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 InviteMemberList = sdk.getComponent("rooms.InviteMemberList");

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

        var inviteMemberListSection;
        if (this.state.inviting) {
            var Loader = sdk.getComponent("elements.Spinner");
            inviteMemberListSection = (
                <Loader />
            );
        }
        else {
            inviteMemberListSection = (
                <InviteMemberList roomId={this.props.roomId}
                    onSearchQueryChanged={this.onSearchQueryChanged}
                    onInvite={this.onInvite} />
            );
        }


        var TruncatedList = sdk.getComponent("elements.TruncatedList");
        return (
            <div className="mx_MemberList">
                    {inviteMemberListSection}
                    <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>
        );
    }
});