import axios from 'axios';
import { randomUUID } from 'crypto';
import { Socket } from 'net';
import { Channel } from './Channel.js';
import { IRCUser } from './IRCUser.js';
import { IRCMessage, parseIRCMessage } from './Message.js';
import numerics from './numerics.js';
import { Server } from './Server.js';

export class Client {
    user: IRCUser|null
    capVersion: string
    enabledCaps: Map<string, string>
    allCaps: Map<string, string>
    localNick: string
    localUsername: string
    localRealname: string
    deviceId: string
    constructor(private socket: Socket, public server: Server) {
        this.user = null;
        this.capVersion = '301';
        this.enabledCaps = new Map();
        this.allCaps = new Map([
            ["account-tag", ""],
            ["batch", ""],
            ["draft/chathistory", ""],
            ["draft/channel-rename", ""],
            ["echo-message", ""],
            ["draft/event-playback", ""],
            ["extended-join", ""],
            ["invite-notify", ""],
            ["message-tags", ""],
            ["sasl", "PLAIN"],
            ["server-time", ""],
        ]);
        this.localNick = 'none';
        this.localUsername = 'none';
        this.localRealname = 'none';
        this.deviceId = "";
        this.socket.on('data', (data) => this.receiveData(data));
        //this.socket.on('close', (e) => {if (this.user) this.user.handleClientClose(this, e)});
    }

    receiveData(data: Buffer|String) {
        const dataArray = data.toString().split('\r\n');
        dataArray.forEach(m => {
            const trimmedMsg = m.replace('\r', '').replace('\n', '');
            if (trimmedMsg !== '')
                this.routeMessage(trimmedMsg);
        });
    }

    checkIfRegistered(passedTags: Map<string, string> = new Map()) {
        if (this.user === null)
            this.sendMessage(this.server.name, "451", [this.localNick, "You have not registered"], passedTags);

        return this.user !== null;
    }

    getMatrixUserFromNick(targetNick: string, passedTags: Map<string, string> = new Map()) {
        if (!this.user) return false;
        const target = this.user.nickToMatrixUser.get(targetNick);
        if (!target) {
            this.sendMessage(this.server.name, "401", [this.user.nick, targetNick, "No such nick"], passedTags);
            return false;
        }
        return target;
    }

    getChannel(channel: string, passedTags: Map<string, string> = new Map()) {
        if (!this.user) return false;
        const targetChannel = this.user.channels.get(channel);
        if (!targetChannel) {
            this.sendMessage(this.server.name, "403", [this.user.nick, channel, "No such channel"], passedTags);
            return false;
        }
        return targetChannel;
    }

    checkIfInChannel(channel: Channel, passedTags: Map<string, string> = new Map()) {
        if (!this.user) return false;
        if (!this.user.channels.get(channel.name)) {
            this.sendMessage(this.server.name, "442", [this.user.nick, "You're not on that channel"], passedTags);
            return false;
        }
        return true;
    }

    checkMinParams(message: IRCMessage, neededNumber: number) {
        if (!this.user) return false;
        if (message.params.length < neededNumber) {
            this.sendMessage(this.server.name, "461", [this.user.nick, message.command, "Not enough parameters"], message.tags);
            return false;
        }
        return true;
    }

    getCapString(capVersion: string) {
        let capArray = [];
        for (const [key, value] of this.allCaps.entries()) {
            if (capVersion === '301' || value.length === 0) {
                capArray.push(key);
            }
            else {
                capArray.push(`${key}=${value}`);
            }
        }
        return capArray.join(' ');
    }

    routeMessage(data: string) {
        const message = parseIRCMessage(data);
        switch (message.command.toUpperCase()) {
            case 'AUTHENTICATE':
                this.doAUTHENTICATE(message);
                break;
            case 'CAP':
                this.doCAP(message);
                break;
            case 'INVITE':
                this.doINVITE(message);
                break;
            case 'KICK':
                this.doKICK(message);
                break;
            case 'MODE':
                this.doMODE(message);
                break;
            case 'NAMES':
                this.doNAMES(message);
                break;
            case 'NOTICE':
                this.doMSG(message);
                break;
            case 'PART':
                this.doPART(message);
                break;
            case 'PING':
                this.sendMessage(this.server.name, "PONG", message.params, message.tags);
                break;
            case 'PRIVMSG':
                this.doMSG(message);
                break;
            case 'TAGMSG':
                this.doTAGMSG(message);
                break;
            case 'TOPIC':
                this.doTOPIC(message);
                break;
            case 'WHO':
                this.doWHO(message);
                break;
        }
    }

    doAUTHENTICATE(message: IRCMessage) {
        if (message.params[0] === "PLAIN") {
            this.sendMessage("", "AUTHENTICATE", ["+"], message.tags);
        }
        else {
            const authArray = Buffer.from(message.params[0], 'base64').toString('utf-8').split('\0');
            if (!authArray || authArray.length !== 3) {
                this.sendMessage(this.server.name, '904', numerics['904']('*'), message.tags)
                this.closeConnectionWithError('Invalid authentication')
            }
            const mxid = authArray[1];
            const accessTokenAndServer = authArray[2];
            const sepIndex = accessTokenAndServer.indexOf(":");
            const accessToken = accessTokenAndServer.slice(0, sepIndex);
            const homeserver = accessTokenAndServer.slice(sepIndex+1);
            console.log(accessToken, homeserver);
            const thisIRCUser = this.server.getOrCreateIRCUser(mxid, accessToken, homeserver);
            thisIRCUser.getVerification().then((response) => {
                if (response.status === 401 || response.status === 403) {
                    this.sendMessage(this.server.name, '904', numerics['904']('*'), message.tags)
                    this.closeConnectionWithError('Invalid authentication')
                } else if (response.status === 429) {
                    this.sendMessage(this.server.name, '904', numerics['904']('*'), message.tags)
                    this.closeConnectionWithError('rate limited, please try again later')
                } else if (response.status !== 200) {
                    this.sendMessage(this.server.name, '904', numerics['904']('*'), message.tags)
                    this.closeConnectionWithError('verification failed, please check credentials')
                }
                this.deviceId = response.data.device_id
                if (response.data.user_id !== mxid) {
                    this.sendMessage(this.server.name, '904', numerics['904']('*'), message.tags)
                    this.closeConnectionWithError('access token does not match mxid, please check credentials')
                } else {
                    this.user = thisIRCUser;
                    this.sendMessage(this.server.name, '900', numerics['900'](this.user.getMask(), this.user.nick), new Map());
                    this.sendMessage(this.server.name, '903', numerics['903'](this.user.nick), new Map());
                    if (this.user.isSynced()) {
                        this.user.addClient(this, message.tags);
                    } else {
                        axios.get(`https://${this.user.homeserver}/_matrix/client/v3/sync?access_token=${accessToken}`).then(response => {
                            const data = response.data;
                            const rooms = data.rooms;
                            if (this.user === null)
                                return;
                            if (rooms['join']) {
                                const joinedRooms: Set<Channel> = new Set();
                                for (const roomId of Object.keys(rooms.join)) {
                                    const targetChannel = this.user.getOrCreateIRCChannel(roomId);
                                    joinedRooms.add(targetChannel);
                                    //@ts-ignore
                                    rooms.join[roomId].state.events.forEach((nextEvent: any) => this.user.routeMatrixEvent(nextEvent, targetChannel));
                                }
                                joinedRooms.forEach(c => {
                                    if (this.user !== null) {
                                        this.user.channels.set(c.name, c);
                                        this.user.roomIdToChannel.set(c.roomId, c);
                                    }
                                });
                            }
                            if (this.user === null)
                                return;
                            this.user.nextBatch = data.next_batch;
                            this.sendMessage(this.server.name, 'NOTICE', [this.user.nick, 'You are now synced to the network!'], message.tags);
                            this.user.addClient(this, message.tags);
                        }).catch(function (error) {
                            console.log(error);
                        })
                    }
                }
            })
        }
    }

    doCAP(message: IRCMessage) {
        switch (message.params[0]) {
            case 'LS': {
                if (message.params.length === 2) {
                    this.capVersion = message.params[1];
                }
                this.sendMessage(this.server.name, "CAP", ["*", "LS", this.getCapString(this.capVersion)], message.tags);
                break;
            }
            case 'LIST': {
                this.sendMessage(this.server.name, "CAP", ["*", "LIST", this.getCapString(this.capVersion)], message.tags);
                break;
            }
            case 'REQ': {
                const capsToChange = (message.params[1].indexOf(' ') === -1) ? [message.params[1]] : message.params[1].split(' ');
                const capsEnabled: string[] = [];
                capsToChange.forEach(cap => {
                    if (this.allCaps.has(cap)) {
                        this.enabledCaps.set(cap, '');
                        capsEnabled.push(cap);
                    }
                });
                this.sendMessage(this.server.name, "CAP", ["*", "ACK", capsEnabled.join(' ')], message.tags);
                break;
            }
            case 'END': {
                if (this.user !== null) {
                    this.doRegistration(message);
                }
                else {
                    this.closeConnectionWithError("You must use SASL to connect to this server");
                }
            }
        }
    }

    doINVITE(message: IRCMessage) {
        if (!this.checkIfRegistered(message.tags) || !this.checkMinParams(message, 2))
            return;
        const targetUser = this.getMatrixUserFromNick(message.params[0], message.tags);
        const targetChannel = this.getChannel(message.params[1], message.tags);
        if (!this.user || !targetUser || !targetChannel) return;
        if (!this.checkIfInChannel(targetChannel, message.tags)) return;
        if (targetChannel.matrixUsers.has(targetUser.nick)) {
            this.sendMessage(this.server.name, "443", [this.user.nick, targetUser.nick, "is already on channel"], message.tags);
            return;
        }
        const reason = (message.params.length === 3) ? message.params[2] : "";
        const data = {
            "reason": reason,
            "user_id": targetUser.mxid
        }
        axios.post(`https://${this.user.homeserver}/_matrix/client/v3/rooms/${targetChannel.roomId}/invite?access_token=${this.user.accessToken}`, data).catch(function (error) {
            if (error.response) {
                console.log(error.response.data);
            } else if (error.request) {
                console.log(error.request);
            } else {
                console.log('Error', error.message);
                console.log(error.config);
            }
        })
    }

    doKICK(message: IRCMessage) {
        if (!this.checkIfRegistered(message.tags) || !this.checkMinParams(message, 2))
            return;
        const targetChannel = this.getChannel(message.params[0], message.tags);
        const targetUser = this.getMatrixUserFromNick(message.params[1], message.tags);
        if (!this.user || !targetUser || !targetChannel) return;
        if (!this.checkIfInChannel(targetChannel, message.tags)) return;
        if (!targetChannel.matrixUsers.has(targetUser.nick)) {
            this.sendMessage(this.server.name, "441", [this.user.nick, targetUser.nick, targetChannel.name, "They aren't on that channel"], message.tags);
            return;
        }
        const reason = (message.params.length === 3) ? message.params[2] : "";
        const data = {
            "reason": reason,
            "user_id": targetUser.mxid
        }
        axios.post(`https://${this.user.homeserver}/_matrix/client/v3/rooms/${targetChannel.roomId}/kick?access_token=${this.user.accessToken}`, data).catch(function (error) {
            if (error.response) {
                console.log(error.response.data);
            } else if (error.request) {
                console.log(error.request);
            } else {
                console.log('Error', error.message);
                console.log(error.config);
            }
        })
    }

    doMODE(message: IRCMessage) {
        if (!this.checkIfRegistered(message.tags) || !this.checkMinParams(message, 1) || !this.user)
            return;
        const targetChannel = this.user.channels.get(message.params[0]);
        if (!targetChannel) {
            if (message.params[0] !== this.user.nick) {
                this.sendMessage(this.server.name, "502", [this.user.nick, "Can't view mode for other users"], message.tags);
                return;
            }
            this.sendMessage(this.server.name, "221", [this.user.nick, "+i"], message.tags);
            return;
        }
        if (!this.checkIfInChannel(targetChannel, message.tags)) return;
        if (message.params.length === 1) {
            this.sendMessage(this.server.name, "324", [this.user.nick, targetChannel.name, `+n`], message.tags);
            return;
        }
    }

    doMSG(message: IRCMessage) {
        if (!this.checkIfRegistered(message.tags) || !this.checkMinParams(message, 2))
            return;
        const targetChannel = this.getChannel(message.params[0], message.tags);
        if (!this.user || !targetChannel) return;
        if (!this.checkIfInChannel(targetChannel, message.tags)) return;
        let msgtype = 'm.text';
        let msgbody = message.params[1];
        if (message.command === 'NOTICE')
            msgtype = 'm.notice';
        else if (message.params[1].startsWith('\x01')) {
            msgtype = 'm.emote';
            msgbody = msgbody.replace(/\x01(ACTION\s)?/gi, '');
        }
        const roomId = targetChannel.roomId;
        const content = {
            "body": msgbody,
            "msgtype": msgtype,
            "m.relates_to": {}
        }
        if (message.tags.has("+draft/reply")) {
            content["m.relates_to"] = {
                "m.in_reply_to": {
                    "event_id": message.tags.get("+draft/reply")
                }
            }
        }
        const newTxnid = randomUUID();
        this.user.txnIdStore.set(newTxnid, this);
        axios.put(`https://${this.user.homeserver}/_matrix/client/v3/rooms/${targetChannel.roomId}/send/m.room.message/${newTxnid}?access_token=${this.user.accessToken}`, content).catch(function (error) {
            if (error.response) {
                console.log(error.response.data);
            } else if (error.request) {
                console.log(error.request);
            } else {
                console.log('Error', error.message);
                console.log(error.config);
            }
        });
    }

    sendNAMES(targetChannel: Channel, passedTags: Map<string, string> = new Map()) {
        if (!this.user) return;
        let namesList: string[] = [];
        for (const matrixUser of targetChannel.matrixUsers.values()) {
            const opStatus = targetChannel.getNickPowerLevelMapping(matrixUser.nick);
            namesList.push(`${opStatus}${matrixUser.nick}`);
        }
        let singleNamesList: string[] = []
        namesList.forEach((singleName, index) => {
            if (index === 0 || index % 20 !== 0) {
                singleNamesList.push(singleName);
            }
            else {
                //@ts-ignore
                this.sendMessage(this.server.name, "353", numerics["353"](this.user.nick, "=", targetChannel.name, singleNamesList), passedTags);
                singleNamesList = [];
            }
        })
        if (singleNamesList.length !== 0) {
            this.sendMessage(this.server.name, "353", numerics["353"](this.user.nick, "=", targetChannel.name, singleNamesList), passedTags);
        }
        this.sendMessage(this.server.name, "366", numerics["366"](this.user.nick, targetChannel.name), passedTags);
    }

    doNAMES(message: IRCMessage) {
        if (!this.checkIfRegistered(message.tags) || !this.checkMinParams(message, 1))
            return;
        const targetChannel = this.getChannel(message.params[0], message.tags);
        if (!this.user || !targetChannel) return;
        if (!this.checkIfInChannel(targetChannel, message.tags)) return;
        this.sendNAMES(targetChannel);
    }

    doPART(message: IRCMessage) {
        if (!this.checkIfRegistered(message.tags) || !this.checkMinParams(message, 1))
            return;
        const targetChannel = this.getChannel(message.params[0], message.tags);
        if (!this.user || !targetChannel) return;
        if (!this.checkIfInChannel(targetChannel, message.tags)) return;
        const reason = (message.params.length === 2) ? message.params[1] : "";
        axios.post(`https://${this.user.homeserver}/_matrix/client/v3/rooms/${targetChannel.roomId}/leave?access_token=${this.user.accessToken}`, {"reason": reason}).then(response => {
            if (response.status === 200) {
                //@ts-ignore
                this.user.getClients().forEach(c => {
                    //@ts-ignore
                    c.sendMessage(this.user.getMask(), "PART", [targetChannel.name, reason], message.tags);
                })
                //@ts-ignore
                this.user.channels.delete(targetChannel.name);
                //@ts-ignore
                this.user.roomIdToChannel.delete(targetChannel.roomId);
            }
            else {
                //@ts-ignore
                this.sendMessage(this.server.name, "NOTICE", [this.user.nick, JSON.stringify(response.data)], message.tags);
            }
        }).catch(function (error) {
            if (error.response) {
                console.log(error.response.data);
            } else if (error.request) {
                console.log(error.request);
            } else {
                console.log('Error', error.message);
                console.log(error.config);
            }
        })
    }

    doTAGMSG(message: IRCMessage) {
        if (!this.checkIfRegistered(message.tags) || !this.checkMinParams(message, 1))
            return;
        const targetChannel = this.getChannel(message.params[0], message.tags);
        if (!this.user || !targetChannel) return;
        if (!this.checkIfInChannel(targetChannel, message.tags)) return;
        if (message.tags.has("+draft/react") && message.tags.has("+draft/reply")) {
            const content = {
                "m.relates_to": {
                    "event_id": message.tags.get("+draft/reply"),
                    "key": message.tags.get("+draft/react"),
                    "rel_type": "m.annotation"
                }
            }
            const newTxnid = randomUUID();
            this.user.txnIdStore.set(newTxnid, this);
            axios.put(`https://${this.user.homeserver}/_matrix/client/v3/rooms/${targetChannel.roomId}/send/m.reaction/${newTxnid}?access_token=${this.user.accessToken}`, content).catch(function (error) {
                if (error.response) {
                    console.log(error.response.data);
                } else if (error.request) {
                    console.log(error.request);
                } else {
                    console.log('Error', error.message);
                    console.log(error.config);
                }
            });
        }
    }

    sendTOPIC(targetChannel: Channel, passedTags: Map<string, string> = new Map()) {
        if (!this.user) return;
        const topicText = targetChannel.topic.get('text') || '';
        const topicSetter = targetChannel.topic.get('setter') || 'matrix';
        const topicTimestamp = targetChannel.topic.get('timestamp') || '0';
        if (topicText === '') {
            this.sendMessage(this.server.name, '331', [this.user.nick, targetChannel.name, 'No topic is set'], passedTags);
            return;
        }
        this.sendMessage(this.server.name, '332', [this.user.nick, targetChannel.name, topicText], passedTags);
        this.sendMessage(this.server.name, '333', [this.user.nick, targetChannel.name, topicSetter, topicTimestamp], passedTags);
    }

    doTOPIC(message: IRCMessage) {
        if (!this.checkIfRegistered(message.tags) || !this.checkMinParams(message, 1))
            return;
        const targetChannel = this.getChannel(message.params[0], message.tags);
        if (!this.user || !targetChannel) return;
        if (!this.checkIfInChannel(targetChannel, message.tags)) return;
        if (message.params.length === 1) {
            this.sendTOPIC(targetChannel, message.tags);
            return;
        }
        const topic = message.params[1];
        axios.put(`https://${this.user.homeserver}/_matrix/client/v3/rooms/${targetChannel.roomId}/state/m.room.topic?access_token=${this.user.accessToken}`, {"topic": topic}).catch(function (error) {
            if (error.response) {
                console.log(error.response.data);
            } else if (error.request) {
                console.log(error.request);
            } else {
                console.log('Error', error.message);
                console.log(error.config);
            }
        })
    }

    doWHO(message: IRCMessage) {
        if (!this.checkIfRegistered(message.tags) || !this.checkMinParams(message, 1))
            return;
        const targetChannel = this.getChannel(message.params[0], message.tags);
        if (!this.user || !targetChannel) return;
        if (!this.checkIfInChannel(targetChannel, message.tags)) return;
        for (const matrixUser of targetChannel.matrixUsers.values()) {
            const opStatus = targetChannel.getNickPowerLevelMapping(matrixUser.nick);
            const userParams = [
                this.user.nick,
                targetChannel.name,
                matrixUser.ident,
                matrixUser.hostname,
                this.server.name,
                matrixUser.nick,
                `H${opStatus}`,
                `0 ${matrixUser.realname}`
            ]
            this.sendMessage(this.server.name, '352', userParams, message.tags);
        }
        this.sendMessage(this.server.name, '315', [this.user.nick, targetChannel.name, "End of /WHO"], message.tags);
    }

    doRegistration(message: IRCMessage) {
        if (this.user === null) {
            this.closeConnectionWithError("You must use SASL to connect to this server");
            return;
        }
        this.sendMessage(this.server.name, '001', numerics['001'](this.user.nick, this.server.name), message.tags);
        this.sendMessage(this.server.name, '002', numerics['002'](this.user.nick, this.server.name, '0.0.1'), message.tags);
        this.sendMessage(this.server.name, '003', numerics['003'](this.user.nick, 'yesterday'), message.tags);
        this.sendMessage(this.server.name, '004', numerics['004'](this.user.nick, this.server.name, '0.0.1', 'i', 'Lhionpsv'), message.tags);
        const iSupportArray = [
            'CASEMAPPING=ascii',
            'CHANMODES=,,,Linps',
            'CHANTYPES=#&!',
            'MAXTARGETS=1',
            'PREFIX=(ohv)@%+',
        ]
        if (this.enabledCaps.has('draft/chathistory')) {
            iSupportArray.push('CHATHISTORY=50');
        }
        this.sendMessage(this.server.name, '005', numerics['005'](this.user.nick, iSupportArray), message.tags);

        this.sendMessage(this.server.name, '375', numerics['375'](this.user.nick), message.tags);
        this.sendMessage(this.server.name, '372', numerics['372'](this.user.nick, "It's an MOTD"), message.tags);
        this.sendMessage(this.server.name, '376', numerics['376'](this.user.nick), message.tags);

        this.sendMessage(this.user.nick, 'MODE', [this.user.nick, '+i'], message.tags);
        if (!this.user.isSynced())
            this.sendMessage(this.server.name, 'NOTICE', [this.user.nick, 'Please wait for initial sync, this may take a while if you are in many large channels'], message.tags);
    }

    sendMessage(prefix: string, command: string, params: string[], tags: Map<string, string>) {
        const capTagMapping = new Map([
            ['account', 'account-tag'],
            ['label', 'labeled-response'],
            ['msgid', 'message-tags'],
            ['reflectionircd.chat/delete-message', 'reflectionircd.chat/delete-message'],
            ['reflectionircd.chat/edit-message', 'reflectionircd.chat/edit-message'],
            ['time', 'server-time'],
        ])
        const ourTags: Map<string, string> = new Map();
        if (this.enabledCaps.has('server-time') && !tags.has('time'))
            ourTags.set('time', new Date().toISOString());

        tags.forEach((v, k) => {
            if (k.startsWith('+')) {
                if (this.enabledCaps.has('message-tags')) {
                    ourTags.set(k, v);
                }
            }
            else {
                const capToCheck = capTagMapping.get(k) || '';
                if (this.enabledCaps.has(capToCheck)) {
                    ourTags.set(k, v);
                }
            }
        })
        const newMsg = new IRCMessage(ourTags, prefix, command, params);
        const msgToSend = newMsg.toString();
        //console.log(`SENT: ${msgToSend}`);
        this.socket.write(`${msgToSend}\r\n`);
    }

    closeConnectionWithError(message: string) {
        this.sendMessage(this.server.name, 'ERROR', [message], new Map());
        this.socket.destroy();
    }
}