import { stat, readdir, copyFile, access, mkdir } from 'fs/promises';
import { constants } from 'fs';
import { join, basename, dirname } from 'path';
import fg from 'fast-glob';

async function prepare_dir(dir) {
    const parents = dirname(dir);
    await access(parents, constants.F_OK).catch(async (err) => {
        if (err.code == 'ENOENT') await prepare_dir(parents);
    });
    await access(dir, constants.F_OK).catch(async (err) => {
        if (err.code == 'ENOENT') await mkdir(dir).catch(err => {
            if (err.code !== 'EEXIST') console.log(err);
        });
    });
}

async function copyToDir(src, tarDir) {
    await prepare_dir(tarDir);

    let notExsit = false;
    const fstat = await stat(src).catch(err => {
        if (err.code == 'ENOENT') {
            console.log(tarDir + ' is not exist');
            notExsit = true;
        }
    });
    if (notExsit) return;
    const tarPath = join(tarDir, basename(src));
    if (fstat.isDirectory()) {
        for (const file of await readdir(src)) {
            const srcPath = join(src, file);
            copyToDir(srcPath, tarPath);
        }
    } else {
        await copyFile(src, tarPath).catch(err => {
            console.log(`The file "${src}" could not be copied`);
        });
    }
}

function copy(copyList, options = {}) {
    const { hook = 'buildEnd' } = options;
    copyList = Array.isArray(copyList) && copyList.length
        ? copyList
        : [];

    return {
        name: 'copy',
        apply: 'build',
        [hook]: async () => {
            for (const { src, dest } of copyList) {
                const matchedSrcs = await fg(src, {
                    expandDirectories: false,
                    onlyFiles: false,
                });
                if (matchedSrcs.length > 0) {
                    for (const src of matchedSrcs) {
                        if (Array.isArray(dest)) {
                            for (const dest of tasks) {
                                await copyToDir(src, dest);
                            }
                        } else {
                            await copyToDir(src, dest);
                        }
                    }
                }
            }
        }
    }
}

export { copy };