/*
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 sdk = require("../../../index");
var Invite = require("../../../Invite");
var createRoom = require("../../../createRoom");
var MatrixClientPeg = require("../../../MatrixClientPeg");
var DMRoomMap = require('../../../utils/DMRoomMap');
var rate_limited_func = require("../../../ratelimitedfunc");
var dis = require("../../../dispatcher");
var Modal = require('../../../Modal');

const TRUNCATE_QUERY_LIST = 40;

module.exports = React.createClass({
    displayName: "ChatInviteDialog",
    propTypes: {
        title: React.PropTypes.string,
        description: React.PropTypes.oneOfType([
            React.PropTypes.element,
            React.PropTypes.string,
        ]),
        value: React.PropTypes.string,
        placeholder: React.PropTypes.string,
        button: React.PropTypes.string,
        focus: React.PropTypes.bool,
        onFinished: React.PropTypes.func.isRequired
    },

    getDefaultProps: function() {
        return {
            title: "Start a chat",
            description: "Who would you like to communicate with?",
            value: "",
            placeholder: "User ID, Name or email",
            button: "Start Chat",
            focus: true
        };
    },

    getInitialState: function() {
        return {
            inviteList: [],
            queryList: [],
        };
    },

    componentDidMount: function() {
        if (this.props.focus) {
            // Set the cursor at the end of the text input
            this.refs.textinput.value = this.props.value;
        }
        this._updateUserList();
    },

    onStartChat: function() {
        var addr;

        // Either an address tile was created, or text input is being used
        if (this.state.inviteList[0]) {
            addr = this.state.inviteList[0];
        } else {
            addr = this.refs.textinput.value;
        }

        // Check if the addr is a valid type
        if (Invite.getAddressType(addr) === "mx") {
            var room = this._getDirectMessageRoom(addr);
            if (room) {
                // A Direct Message room already exists for this user and you
                // so go straight to that room
                dis.dispatch({
                    action: 'view_room',
                    room_id: room.roomId,
                });
                this.props.onFinished(true, addr);
            } else {
                this._startChat(addr);
            }
        } else if (Invite.getAddressType(addr) === "email") {
            this._startChat(addr);
        } else {
            // Nothing to do, so focus back on the textinput
            this.refs.textinput.focus();
        }
    },

    onCancel: function() {
        this.props.onFinished(false);
    },

    onKeyDown: function(e) {
        if (e.keyCode === 27) { // escape
            e.stopPropagation();
            e.preventDefault();
            this.props.onFinished(false);
        } else if (e.keyCode === 38) { // up arrow
            e.stopPropagation();
            e.preventDefault();
            this.addressSelector.onKeyUpArrow();
        } else if (e.keyCode === 40) { // down arrow
            e.stopPropagation();
            e.preventDefault();
            this.addressSelector.onKeyDownArrow();
        } else if (e.keyCode === 13) { // enter
            e.stopPropagation();
            e.preventDefault();
            this.addressSelector.onKeyReturn();
        }
    },

    onQueryChanged: function(ev) {
        var query = ev.target.value;
        var queryList = [];

        // Only do search if there is something to search
        if (query.length > 0) {
            queryList = this._userList.filter((user) => {
                return this._matches(query, user);
            });
        }

        this.setState({ queryList: queryList });
    },

    onDismissed: function(index) {
        var self = this;
        return function() {
            var inviteList = self.state.inviteList.slice();
            inviteList.splice(index, 1);
            self.setState({
                inviteList: inviteList,
                queryList: [],
            });
        }
    },

    onClick: function(index) {
        var self = this;
        return function() {
            self.onSelected(index);
        };
    },

    onSelected: function(index) {
        var inviteList = this.state.inviteList.slice();
        inviteList.push(this.state.queryList[index].userId.toLowerCase());
        this.setState({
            inviteList: inviteList,
            queryList: [],
        });
    },

    _getDirectMessageRoom: function(addr) {
        const dmRoomMap = new DMRoomMap(MatrixClientPeg.get());
        var dmRooms = dmRoomMap.getDMRoomsForUserId(addr);
        if (dmRooms.length > 0) {
            // Cycle through all the DM rooms and find the first non forgotten or parted room
            for (let i = 0; i < dmRooms.length; i++) {
                let room = MatrixClientPeg.get().getRoom(dmRooms[i]);
                if (room) {
                    return room;
                }
            }
        }
        return null;
    },

    _startChat: function(addr) {
        // Start the chat
        createRoom().then(function(roomId) {
            return Invite.inviteToRoom(roomId, addr);
        })
        .catch(function(err) {
            var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
            Modal.createDialog(ErrorDialog, {
                title: "Failure to invite user",
                description: err.toString()
            });
            return null;
        })
        .done();

        // Close - this will happen before the above, as that is async
        this.props.onFinished(true, addr);
    },

    _updateUserList: new rate_limited_func(function() {
        // Get all the users
        this._userList = MatrixClientPeg.get().getUsers();
    }, 500),

    // This is the search algorithm for matching users
    _matches: function(query, user) {
        var name = user.displayName.toLowerCase();
        var uid = user.userId.toLowerCase();
        query = query.toLowerCase();

        // dount match any that are already on the invite list
        if (this._isOnInviteList(uid)) {
            return false;
        }

        // direct prefix matches
        if (name.indexOf(query) === 0 || uid.indexOf(query) === 0) {
            return true;
        }

        // strip @ on uid and try matching again
        if (uid.length > 1 && uid[0] === "@" && uid.substring(1).indexOf(query) === 0) {
            return true;
        }

        // split spaces in name and try matching constituent parts
        var parts = name.split(" ");
        for (var i = 0; i < parts.length; i++) {
            if (parts[i].indexOf(query) === 0) {
                return true;
            }
        }
        return false;
    },

    _isOnInviteList: function(uid) {
        for (let i = 0; i < this.state.inviteList.length; i++) {
            if (this.state.inviteList[i] === uid) {
                return true;
            }
        }
        return false;
    },

    render: function() {
        var TintableSvg = sdk.getComponent("elements.TintableSvg");
        var AddressSelector = sdk.getComponent("elements.AddressSelector");
        this.scrollElement = null;

        var query = [];
        // create the invite list
        if (this.state.inviteList.length > 0) {
            var AddressTile = sdk.getComponent("elements.AddressTile");
            for (let i = 0; i < this.state.inviteList.length; i++) {
                query.push(
                    <AddressTile key={i} address={this.state.inviteList[i]} canDismiss={true} onDismissed={ this.onDismissed(i) } />
                );
            }
        }
        // Add the query at the end
        query.push(
            <textarea key={this.state.inviteList.length}
                rows="1"
                id="textinput"
                ref="textinput"
                className="mx_ChatInviteDialog_input"
                onChange={this.onQueryChanged}
                placeholder={this.props.placeholder}
                defaultValue={this.props.value}
                autoFocus={this.props.focus}>
            </textarea>
        );

        return (
            <div className="mx_ChatInviteDialog" onKeyDown={this.onKeyDown}>
                <div className="mx_Dialog_title">
                    {this.props.title}
                </div>
                <div className="mx_ChatInviteDialog_cancel" onClick={this.onCancel} >
                    <TintableSvg src="img/icons-close-button.svg" width="35" height="35" />
                </div>
                <div className="mx_ChatInviteDialog_label">
                    <label htmlFor="textinput">{ this.props.description }</label>
                </div>
                <div className="mx_Dialog_content">
                    <div className="mx_ChatInviteDialog_inputContainer">{ query }</div>
                    <AddressSelector ref={(ref) => {this.addressSelector = ref}}
                        addressList={ this.state.queryList }
                        onSelected={ this.onSelected }
                        truncateAt={ TRUNCATE_QUERY_LIST } />
                </div>
                <div className="mx_Dialog_buttons">
                    <button className="mx_Dialog_primary" onClick={this.onStartChat}>
                        {this.props.button}
                    </button>
                </div>
            </div>
        );
    }
});