const { ObjectID } = require('bson');
const { PERM_READ_RECORD_CODE, PERM_REJUDGE, PERM_VIEW_PROBLEM_HIDDEN } = require('../permission');
const { PermissionError } = require('../error');
const problem = require('../model/problem');
const record = require('../model/record');
const contest = require('../model/contest');
const system = require('../model/system');
const user = require('../model/user');
const paginate = require('../lib/paginate');
const bus = require('../service/bus');
const {
    Route, Handler, Connection, ConnectionHandler,
} = require('../service/server');

const RecordHandler = contest.ContestHandlerMixin(Handler);

class RecordListHandler extends RecordHandler {
    async get({
        domainId, page = 1, pid, tid, uidOrName,
    }) {
        this.response.template = 'record_main.html';
        const q = { tid };
        if (uidOrName) {
            q.$or = [
                { unameLower: uidOrName.toLowerCase() },
                { _id: parseInt(uidOrName) },
            ];
        }
        if (pid) q.pid = pid;
        const [rdocs] = await paginate(
            record.getMulti(domainId, q).sort('_id', -1),
            page,
            await system.get('RECORD_PER_PAGE'),
        );
        const [udict, pdict] = await Promise.all([
            user.getList(domainId, rdocs.map((rdoc) => rdoc.uid)),
            problem.getList(domainId, rdocs.map((rdoc) => rdoc.pid), false),
        ]);
        const path = [
            ['Hydro', 'homepage'],
            ['record_main', null],
        ];
        this.response.body = {
            path,
            page,
            rdocs,
            pdict,
            udict,
            fliterPid: pid,
            fliterTid: tid,
            fliterUidOrName: uidOrName,
        };
    }
}

class RecordDetailHandler extends RecordHandler {
    async get({ domainId, rid }) {
        this.response.template = 'record_detail.html';
        const rdoc = await record.get(domainId, rid);
        if (rdoc.tid) {
            const tdoc = await contest.get(domainId, rdoc.tid, rdoc.ttype);
            if (!this.canShowRecord(tdoc, true)) throw new PermissionError(rid);
        }
        if (rdoc.uid !== this.user.uid && !this.user.hasPerm(PERM_READ_RECORD_CODE)) {
            rdoc.code = null;
        }
        const [pdoc, udoc] = await Promise.all([
            problem.get(domainId, rdoc.pid, null, false),
            user.getById(domainId, rdoc.uid),
        ]);
        this.response.body = {
            path: [
                ['Hydro', 'homepage'],
                ['record_detail', null],
            ],
            udoc,
            rdoc,
            pdoc,
            show_status: true,
        };
    }
}

class RecordRejudgeHandler extends Handler {
    async post({ domainId, rid }) {
        this.checkPerm(PERM_REJUDGE);
        const rdoc = await record.get(domainId, rid);
        if (rdoc) await record.rejudge(domainId, rid);
        this.back();
    }
}

const RecordConnectionHandler = contest.ContestHandlerMixin(ConnectionHandler);

class RecordMainConnectionHandler extends RecordConnectionHandler {
    async prepare({ domainId, tid }) {
        this.domainId = domainId;
        if (tid) {
            const tdoc = await contest.get(domainId, tid, -1);
            if (this.canShowRecord(tdoc)) this.tid = tid;
            else {
                this.close();
                return;
            }
        }
        bus.subscribe(['record_change'], this.onRecordChange);
    }

    async message(msg) {
        if (msg.rids instanceof Array) {
            const rdocs = await record.getMulti(
                this.domainId, { _id: { $in: msg.rids.map((id) => new ObjectID(id)) } },
            ).toArray();
            for (const rdoc of rdocs) {
                this.onRecordChange({ value: rdoc });
            }
        }
    }

    async cleanup() {
        bus.unsubscribe(['record_change'], this.onRecordChange);
    }

    async onRecordChange(data) {
        const rdoc = data.value;
        if (rdoc.tid && rdoc.tid.toString() !== this.tid) return;
        // eslint-disable-next-line prefer-const
        let [udoc, pdoc] = await Promise.all([
            user.getById(this.domainId, rdoc.uid),
            problem.get(this.domainId, rdoc.pid),
        ]);
        if (pdoc.hidden && !this.user.hasPerm(PERM_VIEW_PROBLEM_HIDDEN)) pdoc = null;
        this.send({ html: await this.renderHTML('record_main_tr.html', { rdoc, udoc, pdoc }) });
    }
}

class RecordDetailConnectionHandler extends contest.ContestHandlerMixin(ConnectionHandler) {
    async prepare({ domainId, rid }) {
        const rdoc = await record.get(domainId, rid);
        if (rdoc.tid) {
            const tdoc = await contest.get(domainId, rdoc.tid, -1);
            if (!this.canShowRecord(tdoc)) {
                this.close();
                return;
            }
        }
        this.rid = rid;
        bus.subscribe(['record_change'], this.onRecordChange);
        this.onRecordChange({ value: rdoc });
    }

    async onRecordChange(data) {
        const rdoc = data.value;
        if (rdoc._id.toString() !== this.rid.toString()) return;
        this.send({
            status_html: await this.renderHTML('record_detail_status.html', { rdoc }),
            summary_html: await this.renderHTML('record_detail_summary.html', { rdoc }),
        });
    }

    async cleanup() {
        bus.unsubscribe(['record_change'], this.onRecordChange);
    }
}

async function apply() {
    Route('record_main', '/record', RecordListHandler);
    Route('record_detail', '/record/:rid', RecordDetailHandler);
    Route('record_rejudge', '/record/:rid/rejudge', RecordRejudgeHandler);
    Connection('record_conn', '/record-conn', RecordMainConnectionHandler);
    Connection('record_detail_conn', '/record-detail-conn', RecordDetailConnectionHandler);
}

global.Hydro.handler.record = module.exports = apply;