/*
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 q = require("q");
var React = require('react');
var MatrixClientPeg = require('../../../MatrixClientPeg');
var Tinter = require('../../../Tinter');
var sdk = require('../../../index');
var Modal = require('../../../Modal');

var ROOM_COLORS = [
    // magic room default values courtesy of Ribot
    ["#76cfa6", "#eaf5f0"],
    ["#81bddb", "#eaf1f4"],
    ["#bd79cb", "#f3eaf5"],
    ["#c65d94", "#f5eaef"],
    ["#e55e5e", "#f5eaea"],
    ["#eca46f", "#f5eeea"],
    ["#dad658", "#f5f4ea"],
    ["#80c553", "#eef5ea"],
    ["#bb814e", "#eee8e3"],
    ["#595959", "#ececec"],
];

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

    propTypes: {
        room: React.PropTypes.object.isRequired,
        onSaveClick: React.PropTypes.func,
        onCancelClick: React.PropTypes.func,
    },

    getInitialState: function() {
        // work out the initial color index
        var room_color_index = undefined;
        var color_scheme_event = this.props.room.getAccountData("org.matrix.room.color_scheme");
        if (color_scheme_event) {
            var color_scheme = color_scheme_event.getContent();
            if (color_scheme.primary_color) color_scheme.primary_color = color_scheme.primary_color.toLowerCase();
            if (color_scheme.secondary_color) color_scheme.secondary_color = color_scheme.secondary_color.toLowerCase();
            // XXX: we should validate these values
            for (var i = 0; i < ROOM_COLORS.length; i++) {
                var room_color = ROOM_COLORS[i];
                if (room_color[0] === color_scheme.primary_color &&
                    room_color[1] === color_scheme.secondary_color)
                {
                    room_color_index = i;
                    break;
                }
            }
            if (room_color_index === undefined) {
                // append the unrecognised colours to our palette
                room_color_index = ROOM_COLORS.length;
                ROOM_COLORS[room_color_index] = [ color_scheme.primary_color, color_scheme.secondary_color ];
            }
        }
        else {
            room_color_index = 0;
        }

        var tags = {};
        Object.keys(this.props.room.tags).forEach(function(tagName) {
            tags[tagName] = {};
        });

        var are_notifications_muted = false;
        var roomPushRule = MatrixClientPeg.get().getRoomPushRule("global", this.props.room.roomId); 
        if (roomPushRule) {
            if (0 <= roomPushRule.actions.indexOf("dont_notify")) {
                are_notifications_muted = true;
            }
        }
        

        return {
            name: this._yankValueFromEvent("m.room.name", "name"),
            topic: this._yankValueFromEvent("m.room.topic", "topic"),
            join_rule: this._yankValueFromEvent("m.room.join_rules", "join_rule"),
            history_visibility: this._yankValueFromEvent("m.room.history_visibility", "history_visibility"),
            guest_access: this._yankValueFromEvent("m.room.guest_access", "guest_access"),
            power_levels_changed: false,
            color_scheme_changed: false,
            color_scheme_index: room_color_index,
            tags_changed: false,
            tags: tags,
            areNotifsMuted: are_notifications_muted
        };
    },
    
    setName: function(name) {
        this.setState({
            name: name
        });
    },
    
    setTopic: function(topic) {
        this.setState({
            topic: topic
        });
    },
    
    save: function() {
        var stateWasSetDefer = q.defer();
        // the caller may have JUST called setState on stuff, so we need to re-render before saving
        // else we won't use the latest values of things.
        // We can be a bit cheeky here and set a loading flag, and listen for the callback on that
        // to know when things have been set.
        this.setState({ _loading: true}, () => {
            stateWasSetDefer.resolve();
            this.setState({ _loading: false});
        });
        
        return stateWasSetDefer.promise.then(() => {
            return this._save();
        });
    },

    _save: function() {    
        const roomId = this.props.room.roomId;
        var promises = this.saveAliases(); // returns Promise[]
        var originalState = this.getInitialState();
        // diff between original state and this.state to work out what has been changed
        console.log("Original: %s", JSON.stringify(originalState));
        console.log("New: %s", JSON.stringify(this.state));
        if (this.state.name !== originalState.name) {
            promises.push(MatrixClientPeg.get().setRoomName(roomId, this.state.name));
        }
        if (this.state.topic !== originalState.topic) { // TODO: 0-length strings?
            promises.push(MatrixClientPeg.get().setRoomTopic(roomId, this.state.topic));
        }
        // TODO:
        // this.state.join_rule
        // this.state.history_visibility
        // this.state.guest_access
        // setRoomMutePushRule
        // power levels
        // tags
        // color scheme
        
        // submit diffs
        
        return q.allSettled(promises);
    },

    saveAliases: function() {
        if (!this.refs.alias_settings) { return q(); }
        return this.refs.alias_settings.saveSettings();
    },

    resetState: function() {
        this.setState(this.getInitialState());
    },

    canGuestsJoin: function() {
        return this.refs.guests_join.checked;
    },

    canGuestsRead: function() {
        return this.refs.guests_read.checked;
    },

    getTopic: function() {
        return this.refs.topic ? this.refs.topic.value : "";
    },

    getJoinRules: function() {
        return this.refs.is_private.checked ? "invite" : "public";
    },

    getHistoryVisibility: function() {
        return this.refs.share_history.checked ? "shared" : "invited";
    },

    areNotificationsMuted: function() {
        return this.state.are_notifications_muted;
    },

    getPowerLevels: function() {
        if (!this.state.power_levels_changed) return undefined;

        var power_levels = this.props.room.currentState.getStateEvents('m.room.power_levels', '');
        power_levels = power_levels.getContent();

        var new_power_levels = {
            ban: parseInt(this.refs.ban.getValue()),
            kick: parseInt(this.refs.kick.getValue()),
            redact: parseInt(this.refs.redact.getValue()),
            invite: parseInt(this.refs.invite.getValue()),
            events_default: parseInt(this.refs.events_default.getValue()),
            state_default: parseInt(this.refs.state_default.getValue()),
            users_default: parseInt(this.refs.users_default.getValue()),
            users: power_levels.users,
            events: power_levels.events,
        };

        return new_power_levels;
    },

    getTagOperations: function() {
        if (!this.state.tags_changed) return undefined;

        var ops = [];

        var delta = {};
        Object.keys(this.props.room.tags).forEach(function(oldTag) {
            delta[oldTag] = delta[oldTag] || 0;
            delta[oldTag]--;
        });
        Object.keys(this.state.tags).forEach(function(newTag) {
            delta[newTag] = delta[newTag] || 0;
            delta[newTag]++;
        });
        Object.keys(delta).forEach(function(tag) {
            if (delta[tag] == 1) {
                ops.push({ type: "put", tag: tag });
            } else if (delta[tag] == -1) {
                ops.push({ type: "delete", tag: tag });
            } else {
                console.error("Calculated tag delta of " + delta[tag] +
                              " - this should never happen!");
            }
        });

        return ops;
    },

    onPowerLevelsChanged: function() {
        this.setState({
            power_levels_changed: true
        });
    },

    getColorScheme: function() {
        if (!this.state.color_scheme_changed) return undefined;

        return {
            primary_color: ROOM_COLORS[this.state.color_scheme_index][0],
            secondary_color: ROOM_COLORS[this.state.color_scheme_index][1],            
        };
    },

    onColorSchemeChanged: function(index) {
        // preview what the user just changed the scheme to.
        Tinter.tint(ROOM_COLORS[index][0], ROOM_COLORS[index][1]);

        this.setState({
            color_scheme_changed: true,
            color_scheme_index: index,
        });
    },
    
    _yankValueFromEvent: function(stateEventType, keyName, defaultValue) {
        // E.g.("m.room.name","name") would yank the "name" content key from "m.room.name"
        var event = this.props.room.currentState.getStateEvents(stateEventType, '');
        if (!event) {
            return defaultValue;
        }
        return event.getContent()[keyName] || defaultValue;
    },
    
    _onToggle: function(keyName, ev) {
        console.log("Checkbox toggle: %s %s", keyName, ev.target.checked);
        var state = {};
        state[keyName] = ev.target.checked;
        this.setState(state);
    },

    onTagChange: function(tagName, event) {
        if (event.target.checked) {
            if (tagName === 'm.favourite') {
                delete this.state.tags['m.lowpriority'];
            }
            else if (tagName === 'm.lowpriority') {
                delete this.state.tags['m.favourite'];
            }

            this.state.tags[tagName] = this.state.tags[tagName] || {};
        }
        else {
            delete this.state.tags[tagName];
        }

        // XXX: hacky say to deep-edit state
        this.setState({
            tags: this.state.tags,
            tags_changed: true
        });
    },

    render: function() {
        // TODO: go through greying out things you don't have permission to change
        // (or turning them into informative stuff)

        var AliasSettings = sdk.getComponent("room_settings.AliasSettings");
        var EditableText = sdk.getComponent('elements.EditableText');
        var PowerSelector = sdk.getComponent('elements.PowerSelector');

        

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

        var power_levels = this.props.room.currentState.getStateEvents('m.room.power_levels', '');
        var guest_access = this.props.room.currentState.getStateEvents('m.room.guest_access', '');
        if (guest_access) {
            guest_access = guest_access.getContent().guest_access;
        }

        var events_levels = (power_levels ? power_levels.events : {}) || {};

        var user_id = MatrixClientPeg.get().credentials.userId;


        if (power_levels) {
            power_levels = power_levels.getContent();

            var ban_level = parseInt(power_levels.ban);
            var kick_level = parseInt(power_levels.kick);
            var redact_level = parseInt(power_levels.redact);
            var invite_level = parseInt(power_levels.invite || 0);
            var send_level = parseInt(power_levels.events_default || 0);
            var state_level = parseInt(power_levels.state_default || 0);
            var default_user_level = parseInt(power_levels.users_default || 0);

            if (power_levels.ban == undefined) ban_level = 50;
            if (power_levels.kick == undefined) kick_level = 50;
            if (power_levels.redact == undefined) redact_level = 50;

            var user_levels = power_levels.users || {};

            var current_user_level = user_levels[user_id];
            if (current_user_level == undefined) current_user_level = default_user_level;

            var power_level_level = events_levels["m.room.power_levels"];
            if (power_level_level == undefined) {
                power_level_level = state_level;
            }

            var can_change_levels = current_user_level >= power_level_level;
        } else {
            var ban_level = 50;
            var kick_level = 50;
            var redact_level = 50;
            var invite_level = 0;
            var send_level = 0;
            var state_level = 0;
            var default_user_level = 0;

            var user_levels = [];
            var events_levels = [];

            var current_user_level = 0;

            var power_level_level = 0;

            var can_change_levels = false;
        }

        var state_default = (parseInt(power_levels ? power_levels.state_default : 0) || 0);

        var room_aliases_level = state_default;
        if (events_levels['m.room.aliases'] !== undefined) {
            room_aliases_level = events_levels['m.room.aliases'];
        }
        var can_set_room_aliases = current_user_level >= room_aliases_level;

        var canonical_alias_level = state_default;
        if (events_levels['m.room.canonical_alias'] !== undefined) {
            canonical_alias_level = events_levels['m.room.canonical_alias'];
        }
        var can_set_canonical_alias = current_user_level >= canonical_alias_level;

        var can_set_tag = true;

        var self = this;

        var room_colors_section =
            <div>
                <h3>Room Colour</h3>
                <div className="mx_RoomSettings_roomColors">
                    {ROOM_COLORS.map(function(room_color, i) {
                        var selected;
                        if (i === self.state.color_scheme_index) {
                            selected =
                                <div className="mx_RoomSettings_roomColor_selected">
                                    <img src="img/tick.svg" width="17" height="14" alt="./"/>
                                </div>
                        }
                        var boundClick = self.onColorSchemeChanged.bind(self, i)
                        return (
                            <div className="mx_RoomSettings_roomColor"
                                  key={ "room_color_" + i }
                                  style={{ backgroundColor: room_color[1] }}
                                  onClick={ boundClick }>
                                { selected }
                                <div className="mx_RoomSettings_roomColorPrimary" style={{ backgroundColor: room_color[0] }}></div>
                            </div>
                        );
                    })}
                </div>
            </div>;

        var user_levels_section;
        if (Object.keys(user_levels).length) {
            user_levels_section =
                <div>
                    <h3>Privileged Users</h3>
                    <ul className="mx_RoomSettings_userLevels">
                        {Object.keys(user_levels).map(function(user, i) {
                            return (
                                <li className="mx_RoomSettings_userLevel" key={user}>
                                    { user } is a <PowerSelector value={ user_levels[user] } disabled={true}/>
                                </li>
                            );
                        })}
                    </ul>
                </div>;
        }
        else {
            user_levels_section = <div>No users have specific privileges in this room.</div>
        }

        var banned = this.props.room.getMembersWithMembership("ban");
        var banned_users_section;
        if (banned.length) {
            banned_users_section =
                <div>
                    <h3>Banned users</h3>
                    <ul className="mx_RoomSettings_banned">
                        {banned.map(function(member, i) {
                            return (
                                <li key={i}>
                                    {member.userId}
                                </li>
                            );
                        })}
                    </ul>
                </div>;
        }

        var create_event = this.props.room.currentState.getStateEvents('m.room.create', '');
        var unfederatable_section;
        if (create_event.getContent()["m.federate"] === false) {
             unfederatable_section = <div className="mx_RoomSettings_powerLevel">Ths room is not accessible by remote Matrix servers.</div>
        }

        // TODO: support editing custom events_levels
        // TODO: support editing custom user_levels

        var tags = [
            { name: "m.favourite", label: "Favourite", ref: "tag_favourite" },
            { name: "m.lowpriority", label: "Low priority", ref: "tag_lowpriority" },
        ];

        Object.keys(this.state.tags).sort().forEach(function(tagName) {
            if (tagName !== 'm.favourite' && tagName !== 'm.lowpriority') {
                tags.push({ name: tagName, label: tagName });
            }
        });

        var tags_section = 
            <div className="mx_RoomSettings_tags">
                Tagged as:
                { can_set_tag ?
                    tags.map(function(tag, i) {
                        return (<label key={ i }>
                                    <input type="checkbox"
                                           ref={ tag.ref }
                                           checked={ tag.name in self.state.tags }
                                           onChange={ self.onTagChange.bind(self, tag.name) }/>
                                    { tag.label }
                                </label>);
                    }) : tags.map(function(tag) { return tag.label; }).join(", ")
                }
            </div>

        // FIXME: disable guests_read if the user hasn't turned on shared history
        return (
            <div className="mx_RoomSettings">

                { tags_section }

                <div className="mx_RoomSettings_toggles">
                    <label>
                        <input type="checkbox" onChange={this._onToggle.bind(this, "areNotifsMuted")} defaultChecked={this.state.areNotifsMuted}/>
                        Mute notifications for this room
                    </label>
                    <label>
                        <input type="checkbox" ref="is_private" defaultChecked={this.state.join_rule != "public"}/>
                        Make this room private
                    </label>
                    <label>
                        <input type="checkbox" ref="share_history" defaultChecked={history_visibility === "shared" || history_visibility === "world_readable"}/>
                        Share message history with new participants
                    </label>
                    <label>
                        <input type="checkbox" ref="guests_join" defaultChecked={guest_access === "can_join"}/>
                        Let guests join this room
                    </label>
                    <label>
                        <input type="checkbox" ref="guests_read" defaultChecked={history_visibility === "world_readable"}/>
                        Let users read message history without joining
                    </label>
                    <label className="mx_RoomSettings_encrypt">
                        <input type="checkbox" />
                        Encrypt room
                    </label>
                </div>


                { room_colors_section }

                <AliasSettings ref="alias_settings"
                    roomId={this.props.room.roomId}
                    canSetCanonicalAlias={can_set_canonical_alias}
                    canSetAliases={can_set_room_aliases}
                    canonicalAliasEvent={this.props.room.currentState.getStateEvents('m.room.canonical_alias', '')}
                    aliasEvents={this.props.room.currentState.getStateEvents('m.room.aliases')} />

                <h3>Permissions</h3>
                <div className="mx_RoomSettings_powerLevels mx_RoomSettings_settings">
                    <div className="mx_RoomSettings_powerLevel">
                        <span className="mx_RoomSettings_powerLevelKey">The default role for new room members is </span>
                        <PowerSelector ref="users_default" value={default_user_level} disabled={!can_change_levels || current_user_level < default_user_level} onChange={this.onPowerLevelsChanged}/>
                    </div>
                    <div className="mx_RoomSettings_powerLevel">
                        <span className="mx_RoomSettings_powerLevelKey">To send messages, you must be a </span>
                        <PowerSelector ref="events_default" value={send_level} disabled={!can_change_levels || current_user_level < send_level} onChange={this.onPowerLevelsChanged}/>
                    </div>
                    <div className="mx_RoomSettings_powerLevel">
                        <span className="mx_RoomSettings_powerLevelKey">To invite users into the room, you must be a </span>
                        <PowerSelector ref="invite" value={invite_level} disabled={!can_change_levels || current_user_level < invite_level} onChange={this.onPowerLevelsChanged}/>
                    </div>
                    <div className="mx_RoomSettings_powerLevel">
                        <span className="mx_RoomSettings_powerLevelKey">To configure the room, you must be a </span>
                        <PowerSelector ref="state_default" value={state_level} disabled={!can_change_levels || current_user_level < state_level} onChange={this.onPowerLevelsChanged}/>
                    </div>
                    <div className="mx_RoomSettings_powerLevel">
                        <span className="mx_RoomSettings_powerLevelKey">To kick users, you must be a </span>
                        <PowerSelector ref="kick" value={kick_level} disabled={!can_change_levels || current_user_level < kick_level} onChange={this.onPowerLevelsChanged}/>
                    </div>
                    <div className="mx_RoomSettings_powerLevel">
                        <span className="mx_RoomSettings_powerLevelKey">To ban users, you must be a </span>
                        <PowerSelector ref="ban" value={ban_level} disabled={!can_change_levels || current_user_level < ban_level} onChange={this.onPowerLevelsChanged}/>
                    </div>
                    <div className="mx_RoomSettings_powerLevel">
                        <span className="mx_RoomSettings_powerLevelKey">To redact messages, you must be a </span>
                        <PowerSelector ref="redact" value={redact_level} disabled={!can_change_levels || current_user_level < redact_level} onChange={this.onPowerLevelsChanged}/>
                    </div>

                    {Object.keys(events_levels).map(function(event_type, i) {
                        return (
                            <div className="mx_RoomSettings_powerLevel" key={event_type}>
                                <span className="mx_RoomSettings_powerLevelKey">To send events of type <code>{ event_type }</code>, you must be a </span>
                                <PowerSelector value={ events_levels[event_type] } disabled={true} onChange={self.onPowerLevelsChanged}/>
                            </div>
                        );
                    })}

                { unfederatable_section }                    
                </div>

                { user_levels_section }

                { banned_users_section }

                <h3>Advanced</h3>
                <div className="mx_RoomSettings_settings">
                    This room's internal ID is <code>{ this.props.room.roomId }</code>
                </div>

            </div>
        );
    }
});