import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import util from "node:util";
import { createBrowser } from "./browser";
import { createDatabase } from "./database";
import { createLibrary, type Book } from "./library";
import * as pkg from "./package.json";
import { createPlatform, platforms, type TPlatform } from "./platform";

const options = {
  db: {
    type: "string",
    default: "gadl.db",
    toString() {
      return `<database_file_path> (default: ${this.default})`;
    },
  },
  "out-dir": {
    type: "string",
    default: "dist",
    toString() {
      return `<output_directory_path> (default: ${this.default})`;
    },
  },
  "out-authors-limit": {
    type: "string",
    default: "3",
    toString() {
      return `<output_authors_limit> (default: ${this.default})`;
    },
  },
  "no-headless": {
    type: "boolean",
    default: false,
  },
  login: {
    type: "string",
    toString() {
      return [...Object.keys(platforms)].join("|");
    },
    async run() {
      const db = await createDatabase(args.values.db!);
      const browser = await createBrowser({ db, headless: false });
      const platform = createPlatform({
        platform: args.values.login as TPlatform,
        db,
        browser,
      });
      await platform.login();
      await browser.close();
    },
  },
  logout: {
    type: "string",
    toString() {
      return [...Object.keys(platforms)].join("|");
    },
    async run() {
      const db = await createDatabase(args.values.db!),
        headless = !args.values["no-headless"];
      const browser = await createBrowser({ db, headless });
      const platform = createPlatform({
        platform: args.values.logout as TPlatform,
        db,
        browser,
      });
      await platform.logout();
      await browser.close();
    },
  },
  add: {
    type: "string",
    toString() {
      return `<reader_url_or_id>`;
    },
    async run() {
      const db = await createDatabase(args.values.db!);
      const library = createLibrary(db);
      await library.add(args.values.add!);
    },
  },
  delete: {
    type: "string",
    toString() {
      return `<id>`;
    },
    async run() {
      const db = await createDatabase(args.values.db!);
      const library = createLibrary(db);
      await library.delete(Number(args.values.delete));
    },
  },
  list: {
    type: "boolean",
    short: "l",
    async run() {
      const db = await createDatabase(args.values.db!);
      const library = createLibrary(db);
      const books = await library.getBooks();

      console.dir(books, {
        depth: null,
        maxArrayLength: null,
        maxStringLength: null,
      });
    },
  },
  view: {
    type: "string",
    toString() {
      return `<reader_url_or_id>`;
    },
    async run() {
      const db = await createDatabase(args.values.db!);
      const library = createLibrary(db);
      const book = await library.get(args.values.view!);

      if (!book) {
        process.exit(1);
      }

      console.dir(book, {
        depth: null,
        maxArrayLength: null,
        maxStringLength: null,
      });
    },
  },
  pull: {
    type: "string",
    toString() {
      return [...Object.keys(platforms)].join("|");
    },
    async run() {
      const db = await createDatabase(args.values.db!),
        library = createLibrary(db),
        headless = !args.values["no-headless"];
      const browser = await createBrowser({ db, headless });
      const platform = createPlatform({
        platform: args.values.pull as TPlatform,
        db,
        browser,
      });

      for await (const book of platform.pull()) {
        await library.add(book);
      }

      await browser.close();
    },
  },
  download: {
    type: "string",
    toString() {
      return `all|<reader_url_or_id>`;
    },
    async run() {
      const db = await createDatabase(args.values.db!),
        library = createLibrary(db),
        headless = !args.values["no-headless"];
      const books: Array<Book> = [];

      if (args.values.download === "all") {
        books.push(...(await library.getBooks()));
      } else {
        if (URL.canParse(args.values.download!)) {
          await library.add(args.values.download!);
        }

        const book = await library.get(args.values.download!);

        if (!book) {
          process.exit(1);
        }

        books.push(book);
      }

      for (const book of books) {
        const browser = await createBrowser({ db, headless });
        const platform = createPlatform({
          platform: book.platform,
          db,
          browser,
        });
        const dir = await fs.mkdtemp(
          path.join(os.tmpdir(), `gadl-${book.id}-`),
        );
        await platform.download(dir, book);
        await library.archive(dir, book, {
          outDir: args.values["out-dir"]!,
          outAuthorsLimit: Number(args.values["out-authors-limit"]!),
        });
        await browser.close();
      }
    },
  },
  json: {
    type: "boolean",
  },
  version: {
    type: "boolean",
    short: "v",
    run() {
      console.log(pkg.version);
    },
  },
  help: {
    type: "boolean",
    short: "h",
    run() {
      console.log(
        [
          "Usage: gadl [options...]",
          `  $ npx playwright@${pkg.dependencies.playwright} install --with-deps chromium`,
          `  $ gadl --login=<platform_type>`,
          `  $ gadl --download=<reader_url>`,
          "",
          "Available options:",
          ...Object.entries(options).map((option) =>
            [
              `  --${option[0]}`,
              "short" in option[1] && ` -${option[1].short}`,
              option[1].type === "string" && `=${option[1]}`,
            ]
              .filter(Boolean)
              .join(""),
          ),
        ].join("\n"),
      );
    },
  },
} as const;

const args = util.parseArgs({ options });

if (args.values.json) {
  console.dir = function dir(arrayOrObject) {
    for (const obj of [arrayOrObject].flat()) {
      console.log(JSON.stringify(obj));
    }
  };
}

for (const option of Object.keys(options)) {
  if (args.values[option] && typeof options[option].run === "function") {
    await options[option].run();
    process.exit();
  }
}

options.help.run();