/* eslint-disable @typescript-eslint/no-unused-vars */
/* eslint-disable no-await-in-loop */
import { ObjectID } from 'mongodb';
import AdmZip from 'adm-zip';
import Queue from 'p-queue';
import yaml from 'js-yaml';
import { Progress } from './ui';
import { Logger } from './logger';
import { DomainDoc } from './loader';
import { streamToBuffer } from './utils';
import gridfs from './service/gridfs';
import storage from './service/storage';
import db from './service/db';
import problem, { Field, Pdoc } from './model/problem';
import domain from './model/domain';
import * as document from './model/document';
import * as system from './model/system';
import difficultyAlgorithm from './lib/difficulty';

const logger = new Logger('upgrade');
type UpgradeScript = () => Promise<boolean | void>;

export async function iterateAllDomain(cb: (ddoc: DomainDoc, current?: number, total?: number) => Promise<any>) {
    const ddocs = await domain.getMulti().project({ _id: 1, owner: 1 }).toArray();
    for (const i in ddocs) await cb(ddocs[i], +i, ddocs.length);
}

interface PartialPdoc extends Pdoc {
    [key: string]: any,
}

export async function iterateAllProblemInDomain(
    domainId: string,
    fields: (Field | string)[],
    cb: (pdoc: PartialPdoc, current?: number, total?: number) => Promise<any>,
) {
    if (!fields.includes('domainId')) fields.push('domainId');
    if (!fields.includes('docId')) fields.push('docId');
    const cursor = problem.getMulti(domainId, {}, fields as any);
    const total = await problem.getMulti(domainId, {}).count();
    let i = 0;
    while (await cursor.hasNext()) {
        const doc = await cursor.next();
        i++;
        const res = await cb(doc, i, total);
        if (res) await problem.edit(doc.domainId, doc.docId, res);
    }
}

export async function iterateAllProblem(
    fields: (Field | string)[],
    cb: (pdoc: PartialPdoc, current?: number, total?: number) => Promise<any>,
) {
    await iterateAllDomain(async (d) => {
        await iterateAllProblemInDomain(d._id, fields, cb);
    });
}

const scripts: UpgradeScript[] = [
    // Mark as used
    async function _0_1() {
        return true;
    },
    // Init
    async function _1_2() {
        const ddoc = await domain.get('system');
        if (!ddoc) await domain.add('system', 1, 'Hydro', 'Hydro System');
        // TODO discussion node?
        return true;
    },
    // Add history column to ddoc,drdoc,psdoc
    async function _2_3() {
        const _FRESH_INSTALL_IGNORE = 1;
        await iterateAllDomain(async (d) => {
            const bulk = document.coll.initializeUnorderedBulkOp();
            await document.getMulti(d._id, document.TYPE_DISCUSSION).forEach((ddoc) => {
                bulk.find({ _id: ddoc._id }).updateOne({ $set: { history: [] } });
            });
            await document.getMulti(d._id, document.TYPE_DISCUSSION_REPLY).forEach((drdoc) => {
                bulk.find({ _id: drdoc._id }).updateOne({ $set: { history: [] } });
            });
            // TODO tail reply
            await document.getMulti(d._id, document.TYPE_PROBLEM_SOLUTION).forEach((psdoc) => {
                bulk.find({ _id: psdoc._id }).updateOne({ $set: { history: [] } });
            });
            if (bulk.length) await bulk.execute();
        });
        return true;
    },
    async function _3_4() {
        const _FRESH_INSTALL_IGNORE = 1;
        await db.collection('document').updateMany({ pid: /^\d+$/i }, { $unset: { pid: '' } });
        return true;
    },
    async function _4_5() {
        const _FRESH_INSTALL_IGNORE = 1;
        if (storage.error) {
            logger.error('Cannot upgrade. Please change storage config.');
            return false;
        }
        logger.info('Changing storage engine. This may take a long time.');
        // Problem file and User file
        let savedProgress = system.get('upgrade.file.progress.domain');
        if (savedProgress) savedProgress = JSON.parse(savedProgress);
        else savedProgress = { pdocs: [] };
        const ddocs = await domain.getMulti().project({ _id: 1 }).toArray();
        logger.info('Found %d domains.', ddocs.length);
        for (let i = 0; i < ddocs.length; i++) {
            const ddoc = ddocs[i];
            logger.info('Domain %s (%d/%d)', ddoc._id, i + 1, ddocs.length);
            const pdocs = await problem.getMulti(ddoc._id, { data: { $ne: null } }, ['domainId', 'docId', 'data', 'title']).toArray();
            const domainProgress = Progress.create({ items: pdocs.length, title: 'Problems', inline: true });
            for (let j = 0; j < pdocs.length; j++) {
                const pdoc = pdocs[j];
                domainProgress.startItem(`${pdoc.docId}: ${pdoc.title}`);
                if (!savedProgress.pdocs.includes(`${pdoc.domainId}/${pdoc.docId}`) && pdoc.data instanceof ObjectID) {
                    try {
                        const [file, current] = await Promise.all([
                            streamToBuffer(gridfs.openDownloadStream(pdoc.data)),
                            storage.list(`problem/${pdoc.domainId}/${pdoc.docId}/testdata/`),
                        ]);
                        const zip = new AdmZip(file);
                        const entries = zip.getEntries();
                        if (entries.map((entry) => entry.entryName).sort().join('?') !== current.map((f) => f.name).sort().join('?')) {
                            await storage.del(current.map((entry) => entry.prefix + entry.name));
                            const queue = new Queue({ concurrency: 5 });
                            await Promise.all(entries.map(
                                (entry) => queue.add(() => problem.addTestdata(pdoc.domainId, pdoc.docId, entry.entryName, entry.getData())),
                            ));
                        }
                    } catch (e) {
                        if (e.toString().includes('FileNotFound')) {
                            logger.error('Problem data not found %s/%s', pdoc.domainId, pdoc.docId);
                        } else throw e;
                    }
                    savedProgress.pdocs.push(`${pdoc.domainId}/${pdoc.docId}`);
                }
                system.set('upgrade.file.progress.domain', JSON.stringify(savedProgress));
                domainProgress.itemDone(`${pdoc.docId}: ${pdoc.title}`);
            }
            domainProgress.stop();
        }
        logger.success('Files copied successfully. You can now remove collection `file` `fs.files` `fs.chunks` in the database.');
        return true;
    },
    async function _5_6() {
        const _FRESH_INSTALL_IGNORE = 1;
        await iterateAllDomain(async (d) => {
            const bulk = document.coll.initializeUnorderedBulkOp();
            const pdocs = await document.getMulti(d._id, document.TYPE_PROBLEM).project({ domainId: 1, docId: 1 }).toArray();
            for (const pdoc of pdocs) {
                const data = await storage.list(`problem/${pdoc.domainId}/${pdoc.docId}/testdata/`, true);
                bulk.find({ _id: pdoc._id }).updateOne({ $set: { data } });
            }
            if (bulk.length) await bulk.execute();
        });
        return true;
    },
    async function _6_7() {
        // Issue #58
        const _FRESH_INSTALL_IGNORE = 1;
        await domain.edit('system', { owner: 1 });
        return true;
    },
    async function _7_8() {
        return true; // invalid
    },
    async function _8_9() {
        const _FRESH_INSTALL_IGNORE = 1;
        await iterateAllProblem(['docId', 'domainId', 'config'], async (pdoc) => {
            logger.info('%s/%s', pdoc.domainId, pdoc.docId);
            const [data, additional_file] = await Promise.all([
                storage.list(`problem/${pdoc.domainId}/${pdoc.docId}/testdata/`),
                storage.list(`problem/${pdoc.domainId}/${pdoc.docId}/additional_file/`),
            ]);
            await problem.edit(pdoc.domainId, pdoc.docId, { data, additional_file });
            if (!pdoc.config) return;
            if (data.map((d) => d.name).includes('config.yaml')) return;
            const cfg = yaml.dump(pdoc.config);
            await problem.addTestdata(pdoc.domainId, pdoc.docId, 'config.yaml', Buffer.from(cfg));
        });
        return true;
    },
    async function _9_10() {
        const _FRESH_INSTALL_IGNORE = 1;
        await iterateAllProblem([], async (pdoc) => {
            logger.info('%s/%s', pdoc.domainId, pdoc.docId);
            const [data, additional_file] = await Promise.all([
                storage.list(`problem/${pdoc.domainId}/${pdoc.docId}/testdata/`),
                storage.list(`problem/${pdoc.domainId}/${pdoc.docId}/additional_file/`),
            ]) as any;
            for (let i = 0; i < data.length; i++) {
                data[i]._id = data[i].name;
            }
            for (let i = 0; i < additional_file.length; i++) {
                additional_file[i]._id = additional_file[i].name;
            }
            return { data, additional_file };
        });
        return true;
    },
    // Move category to tag
    async function _10_11() {
        const _FRESH_INSTALL_IGNORE = 1;
        await iterateAllProblem(['tag', 'category'], async (pdoc) => {
            await document.coll.updateOne(
                { domainId: pdoc.domainId, docId: pdoc.docId },
                {
                    $set: { tag: [...pdoc.tag || [], ...pdoc.category || []] },
                    $unset: { category: '' },
                },
            );
        });
        return true;
    },
    // Set null tag to []
    async function _11_12() {
        const _FRESH_INSTALL_IGNORE = 1;
        await db.collection('document').updateMany({ docType: 10, tag: null }, { $set: { tag: [] } });
        return true;
    },
    // Update problem difficulty
    async function _12_13() {
        const _FRESH_INSTALL_IGNORE = 1;
        await iterateAllProblem(['nSubmit', 'nAccept'], async (pdoc) => {
            const difficulty = difficultyAlgorithm(pdoc.nSubmit, pdoc.nAccept);
            await problem.edit(pdoc.domainId, pdoc.docId, { difficulty });
        });
        return true;
    },
    // Set domain owner perm
    async function _13_14() {
        const _FRESH_INSTALL_IGNORE = 1;
        await iterateAllDomain((ddoc) => domain.setUserRole(ddoc._id, ddoc.owner, 'root'));
        await db.collection('domain.user').updateMany({ role: 'admin' }, { $set: { role: 'root' } });
        return true;
    },
    async function _14_15() {
        const _FRESH_INSTALL_IGNORE = 1;
        await db.collection('domain.user').deleteMany({ uid: null });
        await db.collection('domain.user').deleteMany({ uid: 0 });
        return true;
    },
    async function _15_16() {
        const _FRESH_INSTALL_IGNORE = 1;
        await iterateAllProblem(['data', 'additional_file'], async (pdoc) => {
            const $set: any = {};
            const td = (pdoc.data || []).filter((f) => !!f.name);
            if (JSON.stringify(td) !== JSON.stringify(pdoc.data)) $set.data = td;
            const af = (pdoc.additional_file || []).filter((f) => !!f.name);
            if (JSON.stringify(af) !== JSON.stringify(pdoc.additional_file)) $set.additional_file = af;
            if (Object.keys($set).length) await problem.edit(pdoc.domainId, pdoc.docId, $set);
        });
        return true;
    },
    async function _16_17() {
        return true;
    },
    async function _17_18() {
        const _FRESH_INSTALL_IGNORE = 1;
        await iterateAllProblem(['content'], async (pdoc) => {
            if (typeof pdoc.content !== 'string') {
                await problem.edit(pdoc.domainId, pdoc.docId, { content: JSON.stringify(pdoc.content) });
            }
        });
        return true;
    },
];

export default scripts;