#!/usr/bin/env node
import { readFileSync, existsSync } from "fs";
import path from "path";
import fs from "vinyl-fs";
import yargs from "yargs";
import * as CSS from "./css.js";
import { streamHTML, toHTML } from "./html.js";

const cli = yargs(process.argv.slice(2))
  .config("config", function (path) {
    return JSON.parse(readFileSync(path), "utf-8");
  })
  .scriptName("gmi-web")
  .command("$0 [files..]", "Convert text/gemini to text/html.", (yargs) =>
    yargs
      .example("$0 --body < ~/my-capsule/index.gmi")
      .example("$0 --html en $(find ~/my-capsule -name '*.gmi')")
      .example(
        "$0 --foreground '#000000' --background '#EEEEEE' --html en < doc.gmi"
      )
      .example("$0 --image jpg --audio mp3 --image png --body < doc.gmi")
      .epilog("See the gmi-web(1) man page for more information.")
  )
  .options({
    body: {
      type: "boolean",
      group: "Core:",
    },
    html: {
      type: "string",
      requiresArg: true,
      group: "Core:",
    },
    css: {
      requiresArg: true,
      group: "Core:",
    },
    dir: {
      type: "string",
      hidden: true,
      choices: ["rtl", "ltr"],
      default: "ltr",
      requiresArg: true,
      group: "HTML:",
    },
    author: {
      type: "string",
      requiresArg: true,
      group: "HTML:",
    },
    descriptions: {
      coerce: (arg) => (typeof arg === "number" ? arg : arg ? Infinity : 0),
      group: "HTML:",
    },
    charset: {
      type: "string",
      hidden: true,
      default: "utf-8",
      requiresArg: true,
      group: "HTML:",
    },
    image: {
      type: "array",
      requiresArg: true,
      group: "Media:",
    },
    audio: {
      type: "array",
      requiresArg: true,
      group: "Media:",
    },
    video: {
      type: "array",
      requiresArg: true,
      group: "Media:",
    },
    inline: {
      type: "boolean",
      hidden: true,
      group: "CSS:",
    },
  });

const css =
  yargs(process.argv.slice(2)).exitProcess(false).argv.css || "gmi-web.css";
const CSS_VARS = CSS.rootVariables(CSS.load({ css }));
Object.keys(CSS_VARS).forEach((key) => {
  const opt = key.replace("--", "");
  cli.option(opt, { default: CSS_VARS[key] });
  cli.conflicts(opt, "core");
  cli.conflicts(opt, "none");
});
cli.group(
  Object.keys(CSS_VARS).map((key) => key.replace("--", "")),
  `${css}:`
);

const argv = cli
  .conflicts("author", "body")
  .conflicts("html", "body")
  .alias("html", "language")
  .alias("html", "lang")
  .showHelpOnFail(true)
  .help().argv;

if (!argv.html && !argv.body) {
  cli.showHelp();
  console.error(`\nMissing required argument: --html or --body`);
  cli.exit(1);
}

argv.inlineCSS = CSS.inline(argv);
argv.styleTag = CSS.style(argv);

if (!argv.files) {
  let gemtext;
  try {
    gemtext = readFileSync(process.stdin.fd, "utf-8");
  } catch (e) {
    cli.showHelp();
    console.error("\nMissing files: pipe from stdin or provide [files..]");
    cli.exit(1);
  }
  console.log(toHTML(gemtext, argv));
} else {
  fs.src(argv.files)
    .pipe(streamHTML(argv))
    .pipe(fs.dest((file) => path.dirname(file.path)));
}