import {dest, series, src} from 'gulp';
import process from 'node:process';
import replace from 'gulp-replace';
import {getRandomValues} from 'node:crypto';
import * as dartSass from 'sass';
import gulpSass from 'gulp-sass';
import {deleteAsync} from 'del';
import {readdirSync, readFileSync, writeFileSync, rmdirSync, existsSync, mkdirSync, statSync} from "fs";
import {join} from 'node:path';

import {compilePack} from '@foundryvtt/foundryvtt-cli';

const sass = gulpSass(dartSass);


/**
 * Generate a random alphanumeric string ID of a given requested length using `crypto.getRandomValues()`.
 * @param {number} length    The length of the random string to generate, which must be at most 16384.
 * @returns {string}         A string containing random letters (A-Z, a-z) and numbers (0-9).
 */
function randomID(length = 16) {
    const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    const cutoff = 0x100000000 - (0x100000000 % chars.length);
    const random = new Uint32Array(length);
    do {
        getRandomValues(random);
    } while (random.some(x => x >= cutoff));
    let id = "";
    for (let i = 0; i < length; i++) id += chars[random[i] % chars.length];
    return id;
}

const convert = function (from, to, ofType, overwrite = true) {

    const SOURCE = from;
    const DEST = to;
    const TYPE = ofType;

    if (overwrite) {
        try {
            rmdirSync(DEST, {force: true, recursive: true})
        } catch (e) {
        }
        mkdirSync(DEST)
    }

    const filewalker = (source) => {
        console.debug("entering directory", source);
        readdirSync(source).forEach(file => {
            if (statSync(join(source, file)).isDirectory()) {
                filewalker(join(source, file));
            } else {
                console.debug("processing file", join(source, file))
                let originalSource = JSON.parse(readFileSync(join(source, file), {encoding: "utf8"}));
                let id = randomID();

                let targetSource = {
                    _id: id,
                    _key: "!items!" + id,
                    type: TYPE,
                    img: originalSource.image,
                    name: originalSource.name.trim(),
                    system: {...originalSource},
                }
                delete targetSource.system.image;
                let target = JSON.stringify(targetSource, null, 2);
                let newFileName = "./" + join(DEST, id + ".json");
                writeFileSync(newFileName, target, {encoding: "utf8"});
            }
        });
    }

    filewalker(SOURCE)

}

function cleanDist() {
    return deleteAsync(['dist/**']);
}

function buildStyles() {
    return src('src/style/**/*.scss')
        .pipe(sass().on('error', sass.logError))
        .pipe(dest('dist/style/'))
}

function copySource() {
    return src(['src/**/*', '!src/assets/**/*', '!src/style/**/*.scss', '!src/packs/**/*'])
        .pipe(dest('dist/'));
}

function copyAssets() {
    return src(['src/assets/**/*'], {encoding: false})
        .pipe(dest('dist/assets/'))
}

function updateManifestFile() {
    return src('dist/system.json')
        .pipe(replace('{{VERSION}}', process.env.VERSION))
        .pipe(dest('dist/'))
}

async function prepareDB() {

    try {
        if (!existsSync("./src/packs/__source")) {
            mkdirSync("./src/packs/__source");
        }

        convert("./src/packs/_source/talente", "./src/packs/__source/talente", "Skill");
        convert("./src/packs/_source/zauber", "./src/packs/__source/zauber", "Spell");
        convert("./src/packs/_source/vorteile", "./src/packs/__source/vorteile", "Advantage");
        convert("./src/packs/_source/nachteile", "./src/packs/__source/vorteile", "Advantage", false);
        convert("./src/packs/_source/sonderfertigkeiten", "./src/packs/__source/sonderfertigkeiten", "SpecialAbility");
        convert("./src/packs/_source/waehrungen", "./src/packs/__source/waehrungen", "Equipment");
        convert("./src/packs/_source/Gegenstaende/Waffen", "./src/packs/__source/Waffen", "Equipment");
        convert("./src/packs/_source/Gegenstaende/Munition", "./src/packs/__source/Munition", "Equipment");
        convert("./src/packs/_source/Gegenstaende/Ruestzeug", "./src/packs/__source/Ruestzeug", "Equipment");
        convert("./src/packs/_source/Gegenstaende/Behaelter", "./src/packs/__source/Gegenstaende", "Equipment", false);
        convert("./src/packs/_source/Gegenstaende/Bekleidung", "./src/packs/__source/Gegenstaende", "Equipment", false);
        convert("./src/packs/_source/Gegenstaende/Beleuchtung", "./src/packs/__source/Gegenstaende", "Equipment", false);
        convert("./src/packs/_source/Gegenstaende/Buecher", "./src/packs/__source/Gegenstaende", "Equipment", false);
        convert("./src/packs/_source/Gegenstaende/Essutensilien", "./src/packs/__source/Gegenstaende", "Equipment", false);
        convert("./src/packs/_source/Gegenstaende/Sonstiges", "./src/packs/__source/Gegenstaende", "Equipment", false);
        convert("./src/packs/_source/Gegenstaende/Werkzeug", "./src/packs/__source/Gegenstaende", "Equipment", false);
        convert("./src/packs/_source/Gegenstaende/Seile", "./src/packs/__source/Gegenstaende", "Equipment", false);
        convert("./src/packs/_source/liturgien-und-segnungen", "./src/packs/__source/liturgien", "Liturgy");
        convert("./src/packs/_source/wunden", "./src/packs/__source/wunden", "ActiveEffect");

        convert("./src/packs/_source/kulturen", "./src/packs/__source/kulturen", "Culture");
        convert("./src/packs/_source/spezien", "./src/packs/__source/spezien", "Species");
        convert("./src/packs/_source/professionen", "./src/packs/__source/professionen", "Profession");

    } catch (err) {
        console.error(err);
    }

}

function buildDB() {
    // Determine which source folders to process

    const PACK_SRC = "src/packs/__source"
    const PACK_DEST = "dist/packs/"

    return new Promise(async (resolve, reject) => {
        const folders = readdirSync(PACK_SRC, {withFileTypes: true}).filter(file =>
            file.isDirectory()
        );

        for (const folder of folders) {
            const src = join(PACK_SRC, folder.name);
            const dest = join(PACK_DEST, folder.name);
            console.info(`Compiling pack ${folder.name}`);
            await compilePack(src, dest, {recursive: true, nedb: false});

        }
        resolve()
    })
}


export default series(
    cleanDist,
    copySource,
    copyAssets,
    buildStyles,
    prepareDB,
    buildDB,
    updateManifestFile
)