/*
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.
*/

import React from 'react';
import { _t } from '../../../languageHandler';
import sdk from '../../../index';
import { getAddressType, inviteMultipleToRoom } from '../../../Invite';
import createRoom from '../../../createRoom';
import MatrixClientPeg from '../../../MatrixClientPeg';
import DMRoomMap from '../../../utils/DMRoomMap';
import Modal from '../../../Modal';
import AccessibleButton from '../elements/AccessibleButton';
import q from 'q';
import dis from '../../../dispatcher';

const TRUNCATE_QUERY_LIST = 40;
const QUERY_USER_DIRECTORY_DEBOUNCE_MS = 200;

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

    getDefaultProps: function() {
        return {
            value: "",
            focus: true,
        };
    },

    getInitialState: function() {
        return {
            error: false,

            // List of AddressTile.InviteAddressType objects representing
            // the list of addresses we're going to invite
            inviteList: [],

            // Whether a search is ongoing
            busy: false,
            // An error message generated during the user directory search
            searchError: null,
            // Whether the server supports the user_directory API
            serverSupportsUserDirectory: true,
            // The query being searched for
            query: "",
            // List of AddressTile.InviteAddressType objects representing
            // the set of auto-completion results for the current search
            // query.
            queryList: [],
        };
    },

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

    onButtonClick: function() {
        let inviteList = this.state.inviteList.slice();
        // Check the text input field to see if user has an unconverted address
        // If there is and it's valid add it to the local inviteList
        if (this.refs.textinput.value !== '') {
            inviteList = this._addInputToList();
            if (inviteList === null) return;
        }

        const addrTexts = inviteList.map(addr => addr.address);
        if (inviteList.length > 0) {
            if (this._isDmChat(addrTexts)) {
                const userId = inviteList[0].address;
                // Direct Message chat
                const rooms = this._getDirectMessageRooms(userId);
                if (rooms.length > 0) {
                    // A Direct Message room already exists for this user, so select a
                    // room from a list that is similar to the one in MemberInfo panel
                    const ChatCreateOrReuseDialog = sdk.getComponent(
                        "views.dialogs.ChatCreateOrReuseDialog",
                    );
                    const close = Modal.createDialog(ChatCreateOrReuseDialog, {
                        userId: userId,
                        onFinished: (success) => {
                            this.props.onFinished(success);
                        },
                        onNewDMClick: () => {
                            dis.dispatch({
                                action: 'start_chat',
                                user_id: userId,
                            });
                            close(true);
                        },
                        onExistingRoomSelected: (roomId) => {
                            dis.dispatch({
                                action: 'view_room',
                                room_id: roomId,
                            });
                            close(true);
                        },
                    }).close;
                } else {
                    this._startChat(inviteList);
                }
            } else {
                // Multi invite chat
                this._startChat(inviteList);
            }
        } else {
            // No addresses supplied
            this.setState({ error: true });
        }
    },

    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();
            if (this.addressSelector) this.addressSelector.moveSelectionUp();
        } else if (e.keyCode === 40) { // down arrow
            e.stopPropagation();
            e.preventDefault();
            if (this.addressSelector) this.addressSelector.moveSelectionDown();
        } else if (this.state.queryList.length > 0 && (e.keyCode === 188 || e.keyCode === 13 || e.keyCode === 9)) { // comma or enter or tab
            e.stopPropagation();
            e.preventDefault();
            if (this.addressSelector) this.addressSelector.chooseSelection();
        } else if (this.refs.textinput.value.length === 0 && this.state.inviteList.length && e.keyCode === 8) { // backspace
            e.stopPropagation();
            e.preventDefault();
            this.onDismissed(this.state.inviteList.length - 1)();
        } else if (e.keyCode === 13) { // enter
            e.stopPropagation();
            e.preventDefault();
            if (this.refs.textinput.value == '') {
                // if there's nothing in the input box, submit the form
                this.onButtonClick();
            } else {
                this._addInputToList();
            }
        } else if (e.keyCode === 188 || e.keyCode === 9) { // comma or tab
            e.stopPropagation();
            e.preventDefault();
            this._addInputToList();
        }
    },

    onQueryChanged: function(ev) {
        const query = ev.target.value.toLowerCase();
        if (this.queryChangedDebouncer) {
            clearTimeout(this.queryChangedDebouncer);
        }
        // Only do search if there is something to search
        if (query.length > 0 && query != '@' && query.length >= 2) {
            this.queryChangedDebouncer = setTimeout(() => {
                if (this.state.serverSupportsUserDirectory) {
                    this._doUserDirectorySearch(query);
                } else {
                    this._doLocalSearch(query);
                }
            }, QUERY_USER_DIRECTORY_DEBOUNCE_MS);
        } else {
            this.setState({
                queryList: [],
                query: "",
                searchError: null,
            });
        }
    },

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

    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]);
        this.setState({
            inviteList: inviteList,
            queryList: [],
            query: "",
        });
        if (this._cancelThreepidLookup) this._cancelThreepidLookup();
    },

    _doUserDirectorySearch: function(query) {
        this.setState({
            busy: true,
            query,
            searchError: null,
        });
        MatrixClientPeg.get().searchUserDirectory({
            term: query,
        }).then((resp) => {
            // The query might have changed since we sent the request, so ignore
            // responses for anything other than the latest query.
            if (this.state.query !== query) {
                return;
            }
            this._processResults(resp.results, query);
        }).catch((err) => {
            console.error('Error whilst searching user directory: ', err);
            this.setState({
                searchError: err.errcode ? err.message : _t('Something went wrong!'),
            });
            if (err.errcode === 'M_UNRECOGNIZED') {
                this.setState({
                    serverSupportsUserDirectory: false,
                });
                // Do a local search immediately
                this._doLocalSearch(query);
            }
        }).done(() => {
            this.setState({
                busy: false,
            });
        });
    },

    _doLocalSearch: function(query) {
        this.setState({
            query,
            searchError: null,
        });
        const results = [];
        MatrixClientPeg.get().getUsers().forEach((user) => {
            if (user.userId.toLowerCase().indexOf(query) === -1 &&
                user.displayName.toLowerCase().indexOf(query) === -1
            ) {
                return;
            }

            // Put results in the format of the new API
            results.push({
                user_id: user.userId,
                display_name: user.displayName,
                avatar_url: user.avatarUrl,
            });
        });
        this._processResults(results, query);
    },

    _processResults: function(results, query) {
        const queryList = [];
        results.forEach((user) => {
            if (user.user_id === MatrixClientPeg.get().credentials.userId) {
                return;
            }
            // Return objects, structure of which is defined
            // by InviteAddressType
            queryList.push({
                addressType: 'mx',
                address: user.user_id,
                displayName: user.display_name,
                avatarMxc: user.avatar_url,
                isKnown: true,
            });
        });

        // If the query is a valid address, add an entry for that
        // This is important, otherwise there's no way to invite
        // a perfectly valid address if there are close matches.
        const addrType = getAddressType(query);
        if (addrType !== null) {
            queryList.unshift({
                addressType: addrType,
                address: query,
                isKnown: false,
            });
            if (this._cancelThreepidLookup) this._cancelThreepidLookup();
            if (addrType == 'email') {
                this._lookupThreepid(addrType, query).done();
            }
        }
        this.setState({
            queryList,
            error: false,
        }, () => {
            if (this.addressSelector) this.addressSelector.moveSelectionTop();
        });
    },

    _getDirectMessageRooms: function(addr) {
        const dmRoomMap = new DMRoomMap(MatrixClientPeg.get());
        const dmRooms = dmRoomMap.getDMRoomsForUserId(addr);
        const rooms = [];
        dmRooms.forEach(dmRoom => {
            let room = MatrixClientPeg.get().getRoom(dmRoom);
            if (room) {
                const me = room.getMember(MatrixClientPeg.get().credentials.userId);
                if (me.membership == 'join') {
                    rooms.push(room);
                }
            }
        });
        return rooms;
    },

    _startChat: function(addrs) {
        if (MatrixClientPeg.get().isGuest()) {
            dis.dispatch({action: 'view_set_mxid'});
            return;
        }

        const addrTexts = addrs.map((addr) => {
            return addr.address;
        });

        if (this.props.roomId) {
            // Invite new user to a room
            var self = this;
            inviteMultipleToRoom(this.props.roomId, addrTexts)
            .then(function(addrs) {
                var room = MatrixClientPeg.get().getRoom(self.props.roomId);
                return self._showAnyInviteErrors(addrs, room);
            })
            .catch(function(err) {
                console.error(err.stack);
                var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
                Modal.createDialog(ErrorDialog, {
                    title: _t("Failed to invite"),
                    description: ((err && err.message) ? err.message : _t("Operation failed")),
                });
                return null;
            })
            .done();
        } else if (this._isDmChat(addrTexts)) {
            // Start the DM chat
            createRoom({dmUserId: addrTexts[0]})
            .catch(function(err) {
                console.error(err.stack);
                var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
                Modal.createDialog(ErrorDialog, {
                    title: _t("Failed to invite user"),
                    description: ((err && err.message) ? err.message : _t("Operation failed")),
                });
                return null;
            })
            .done();
        } else {
            // Start multi user chat
            var self = this;
            var room;
            createRoom().then(function(roomId) {
                room = MatrixClientPeg.get().getRoom(roomId);
                return inviteMultipleToRoom(roomId, addrTexts);
            })
            .then(function(addrs) {
                return self._showAnyInviteErrors(addrs, room);
            })
            .catch(function(err) {
                console.error(err.stack);
                var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
                Modal.createDialog(ErrorDialog, {
                    title: _t("Failed to invite"),
                    description: ((err && err.message) ? err.message : _t("Operation failed")),
                });
                return null;
            })
            .done();
        }

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

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

    _isDmChat: function(addrTexts) {
        if (addrTexts.length === 1 &&
            getAddressType(addrTexts[0]) === "mx" &&
            !this.props.roomId
        ) {
            return true;
        } else {
            return false;
        }
    },

    _showAnyInviteErrors: function(addrs, room) {
        // Show user any errors
        var errorList = [];
        for (var addr in addrs) {
            if (addrs.hasOwnProperty(addr) && addrs[addr] === "error") {
                errorList.push(addr);
            }
        }

        if (errorList.length > 0) {
            var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
            Modal.createDialog(ErrorDialog, {
                title: _t("Failed to invite the following users to the %(roomName)s room:", {roomName: room.name}),
                description: errorList.join(", "),
            });
        }
        return addrs;
    },

    _addInputToList: function() {
        const addressText = this.refs.textinput.value.trim();
        const addrType = getAddressType(addressText);
        const addrObj = {
            addressType: addrType,
            address: addressText,
            isKnown: false,
        };
        if (addrType == null) {
            this.setState({ error: true });
            return null;
        } else if (addrType == 'mx') {
            const user = MatrixClientPeg.get().getUser(addrObj.address);
            if (user) {
                addrObj.displayName = user.displayName;
                addrObj.avatarMxc = user.avatarUrl;
                addrObj.isKnown = true;
            }
        }

        const inviteList = this.state.inviteList.slice();
        inviteList.push(addrObj);
        this.setState({
            inviteList: inviteList,
            queryList: [],
            query: "",
        });
        if (this._cancelThreepidLookup) this._cancelThreepidLookup();
        return inviteList;
    },

    _lookupThreepid: function(medium, address) {
        let cancelled = false;
        // Note that we can't safely remove this after we're done
        // because we don't know that it's the same one, so we just
        // leave it: it's replacing the old one each time so it's
        // not like they leak.
        this._cancelThreepidLookup = function() {
            cancelled = true;
        }

        // wait a bit to let the user finish typing
        return q.delay(500).then(() => {
            if (cancelled) return null;
            return MatrixClientPeg.get().lookupThreePid(medium, address);
        }).then((res) => {
            if (res === null || !res.mxid) return null;
            if (cancelled) return null;

            return MatrixClientPeg.get().getProfileInfo(res.mxid);
        }).then((res) => {
            if (res === null) return null;
            if (cancelled) return null;
            this.setState({
                queryList: [{
                    // an InviteAddressType
                    addressType: medium,
                    address: address,
                    displayName: res.displayname,
                    avatarMxc: res.avatar_url,
                    isKnown: true,
                }],
            });
        });
    },

    render: function() {
        const TintableSvg = sdk.getComponent("elements.TintableSvg");
        const 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>,
        );

        let error;
        let addressSelector;
        if (this.state.error) {
            error = <div className="mx_ChatInviteDialog_error">{_t("You have entered an invalid contact. Try using their Matrix ID or email address.")}</div>;
        } else if (this.state.searchError) {
            error = <div className="mx_ChatInviteDialog_error">{this.state.searchError}</div>;
        } else if (
            this.state.query.length > 0 &&
            this.state.queryList.length === 0 &&
            !this.state.busy
        ) {
            error = <div className="mx_ChatInviteDialog_error">{_t("No results")}</div>;
        } else {
            addressSelector = (
                <AddressSelector ref={(ref) => {this.addressSelector = ref;}}
                    addressList={ this.state.queryList }
                    onSelected={ this.onSelected }
                    truncateAt={ TRUNCATE_QUERY_LIST }
                />
            );
        }

        return (
            <div className="mx_ChatInviteDialog" onKeyDown={this.onKeyDown}>
                <div className="mx_Dialog_title">
                    {this.props.title}
                </div>
                <AccessibleButton className="mx_ChatInviteDialog_cancel"
                        onClick={this.onCancel} >
                    <TintableSvg src="img/icons-close-button.svg" width="35" height="35" />
                </AccessibleButton>
                <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>
                    { error }
                    { addressSelector }
                </div>
                <div className="mx_Dialog_buttons">
                    <button className="mx_Dialog_primary" onClick={this.onButtonClick}>
                        {this.props.button}
                    </button>
                </div>
            </div>
        );
    }
});