import fs, { readFileSync } from 'fs';
import path from 'path';

import { GrowiThemeMetadata, ViteManifest } from '@growi/core';
// eslint-disable-next-line no-restricted-imports
import axios from 'axios';
import mongoose from 'mongoose';
import streamToPromise from 'stream-to-promise';
import unzipper from 'unzipper';

import {
  GrowiPlugin, GrowiPluginOrigin, GrowiPluginResourceType, GrowiThemePluginMeta,
} from '~/interfaces/plugin';
import loggerFactory from '~/utils/logger';
import { resolveFromRoot } from '~/utils/project-dir-utils';

import type { GrowiPluginModel } from '../models/growi-plugin';

const logger = loggerFactory('growi:plugins:plugin-utils');

const pluginStoringPath = resolveFromRoot('tmp/plugins');

// https://regex101.com/r/fK2rV3/1
const githubReposIdPattern = new RegExp(/^\/([^/]+)\/([^/]+)$/);

const PLUGINS_STATIC_DIR = '/static/plugins'; // configured by express.static

export type GrowiPluginResourceEntries = [installedPath: string, href: string][];


function retrievePluginManifest(growiPlugin: GrowiPlugin): ViteManifest {
  const manifestPath = resolveFromRoot(path.join('tmp/plugins', growiPlugin.installedPath, 'dist/manifest.json'));
  const manifestStr: string = readFileSync(manifestPath, 'utf-8');
  return JSON.parse(manifestStr);
}

export interface IPluginService {
  install(origin: GrowiPluginOrigin): Promise<void>
  retrieveThemeHref(theme: string): Promise<string | undefined>
  retrieveAllPluginResourceEntries(): Promise<GrowiPluginResourceEntries>
}

export class PluginService implements IPluginService {

  async install(origin: GrowiPluginOrigin): Promise<void> {
    // download
    const ghUrl = new URL(origin.url);
    const ghPathname = ghUrl.pathname;
    // TODO: Branch names can be specified.
    const ghBranch = 'main';

    const match = ghPathname.match(githubReposIdPattern);
    if (ghUrl.hostname !== 'github.com' || match == null) {
      throw new Error('The GitHub Repository URL is invalid.');
    }

    const ghOrganizationName = match[1];
    const ghReposName = match[2];
    const requestUrl = `https://github.com/${ghOrganizationName}/${ghReposName}/archive/refs/heads/${ghBranch}.zip`;

    // download github repository to local file system
    await this.download(requestUrl, ghOrganizationName, ghReposName, ghBranch);

    // save plugin metadata
    const installedPath = `${ghOrganizationName}/${ghReposName}`;
    const plugins = await PluginService.detectPlugins(origin, installedPath);
    await this.savePluginMetaData(plugins);

    return;
  }

  private async download(requestUrl: string, ghOrganizationName: string, ghReposName: string, ghBranch: string): Promise<void> {

    const zipFilePath = path.join(pluginStoringPath, `${ghBranch}.zip`);
    const unzippedPath = path.join(pluginStoringPath, ghOrganizationName);

    const renamePath = async(oldPath: fs.PathLike, newPath: fs.PathLike) => {
      if (fs.existsSync(newPath)) {
        // delete old directory
        await fs.promises.rm(newPath, { recursive: true });

        // delete old document
        const GrowiPlugin = mongoose.model<GrowiPlugin>('GrowiPlugin');
        await GrowiPlugin.deleteOne({ url: `https://github.com/${ghOrganizationName}/${ghReposName}` });

        // rename new directory
        fs.renameSync(oldPath, newPath);
      }
      else {
        fs.renameSync(oldPath, newPath);
      }
    };

    const downloadFile = async(requestUrl: string, filePath: string) => {
      return new Promise<void>((resolve, reject) => {
        axios({
          method: 'GET',
          url: requestUrl,
          responseType: 'stream',
        })
          .then((res) => {
            if (res.status === 200) {
              const file = fs.createWriteStream(filePath);
              res.data.pipe(file)
                .on('close', () => file.close())
                .on('finish', () => {
                  return resolve();
                });
            }
            else {
              return reject(res.status);
            }
          }).catch((err) => {
            return reject(err);
          });
      });
    };

    const unzip = async(zipFilePath: fs.PathLike, unzippedPath: fs.PathLike) => {
      const stream = fs.createReadStream(zipFilePath);
      const unzipStream = stream.pipe(unzipper.Extract({ path: unzippedPath }));
      const deleteZipFile = (path: fs.PathLike) => fs.unlink(path, (err) => { return err });

      try {
        await streamToPromise(unzipStream);
        deleteZipFile(zipFilePath);
      }
      catch (err) {
        return err;
      }
    };

    try {
      await downloadFile(requestUrl, zipFilePath);
      await unzip(zipFilePath, unzippedPath);
      await renamePath(`${unzippedPath}/${ghReposName}-${ghBranch}`, `${unzippedPath}/${ghReposName}`);
    }
    catch (err) {
      logger.error(err);
      throw new Error(err);
    }

    return;
  }

  private async savePluginMetaData(plugins: GrowiPlugin[]): Promise<void> {
    const GrowiPlugin = mongoose.model('GrowiPlugin');
    await GrowiPlugin.insertMany(plugins);
  }

  // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
  private static async detectPlugins(origin: GrowiPluginOrigin, installedPath: string, parentPackageJson?: any): Promise<GrowiPlugin[]> {
    const packageJsonPath = path.resolve(pluginStoringPath, installedPath, 'package.json');
    const packageJson = JSON.parse(readFileSync(packageJsonPath, 'utf-8'));

    const { growiPlugin } = packageJson;
    const {
      name: packageName, description: packageDesc, author: packageAuthor,
    } = parentPackageJson ?? packageJson;


    if (growiPlugin == null) {
      throw new Error('This package does not include \'growiPlugin\' section.');
    }

    // detect sub plugins for monorepo
    if (growiPlugin.isMonorepo && growiPlugin.packages != null) {
      const plugins = await Promise.all(
        growiPlugin.packages.map(async(subPackagePath) => {
          const subPackageInstalledPath = path.join(installedPath, subPackagePath);
          return this.detectPlugins(origin, subPackageInstalledPath, packageJson);
        }),
      );
      return plugins.flat();
    }

    if (growiPlugin.types == null) {
      throw new Error('\'growiPlugin\' section must have a \'types\' property.');
    }
    const plugin = {
      isEnabled: true,
      installedPath,
      origin,
      meta: {
        name: growiPlugin.name ?? packageName,
        desc: growiPlugin.desc ?? packageDesc,
        author: growiPlugin.author ?? packageAuthor,
        types: growiPlugin.types,
      },
    };

    // add theme metadata
    if (growiPlugin.types.includes(GrowiPluginResourceType.Theme)) {
      (plugin as GrowiPlugin<GrowiThemePluginMeta>).meta = {
        ...plugin.meta,
        themes: growiPlugin.themes,
      };
    }

    logger.info('Plugin detected => ', plugin);

    return [plugin];
  }

  async listPlugins(): Promise<GrowiPlugin[]> {
    return [];
  }


  async retrieveThemeHref(theme: string): Promise<string | undefined> {

    const GrowiPlugin = mongoose.model('GrowiPlugin') as GrowiPluginModel;

    let matchedPlugin: GrowiPlugin | undefined;
    let matchedThemeMetadata: GrowiThemeMetadata | undefined;

    try {
      // retrieve plugin manifests
      const growiPlugins = await GrowiPlugin.findEnabledPluginsIncludingAnyTypes([GrowiPluginResourceType.Theme]) as GrowiPlugin<GrowiThemePluginMeta>[];

      growiPlugins
        .forEach(async(growiPlugin) => {
          const themeMetadatas = growiPlugin.meta.themes;
          const themeMetadata = themeMetadatas.find(t => t.name === theme);

          // found
          if (themeMetadata != null) {
            matchedPlugin = growiPlugin;
            matchedThemeMetadata = themeMetadata;
          }
        });
    }
    catch (e) {
      logger.error(`Could not find the theme '${theme}' from GrowiPlugin documents.`, e);
    }

    try {
      if (matchedPlugin != null && matchedThemeMetadata != null) {
        const manifest = await retrievePluginManifest(matchedPlugin);
        return `${PLUGINS_STATIC_DIR}/${matchedPlugin.installedPath}/dist/${manifest[matchedThemeMetadata.manifestKey].file}`;
      }
    }
    catch (e) {
      logger.error(`Could not read manifest file for the theme '${theme}'`, e);
    }
  }

  async retrieveAllPluginResourceEntries(): Promise<GrowiPluginResourceEntries> {

    const GrowiPlugin = mongoose.model('GrowiPlugin') as GrowiPluginModel;

    const entries: GrowiPluginResourceEntries = [];

    try {
      const growiPlugins = await GrowiPlugin.findEnabledPlugins();

      growiPlugins.forEach(async(growiPlugin) => {
        try {
          const { types } = growiPlugin.meta;
          const manifest = await retrievePluginManifest(growiPlugin);

          // add script
          if (types.includes(GrowiPluginResourceType.Script) || types.includes(GrowiPluginResourceType.Template)) {
            const href = `${PLUGINS_STATIC_DIR}/${growiPlugin.installedPath}/dist/${manifest['client-entry.tsx'].file}`;
            entries.push([growiPlugin.installedPath, href]);
          }
          // add link
          if (types.includes(GrowiPluginResourceType.Script) || types.includes(GrowiPluginResourceType.Style)) {
            const href = `${PLUGINS_STATIC_DIR}/${growiPlugin.installedPath}/dist/${manifest['client-entry.tsx'].css}`;
            entries.push([growiPlugin.installedPath, href]);
          }
        }
        catch (e) {
          logger.warn(e);
        }
      });
    }
    catch (e) {
      logger.error('Could not retrieve GrowiPlugin documents.', e);
    }

    return entries;
  }

}