#!/usr/bin/env node
import { readFileSync } from "fs";
import path from "path";
import fs from "vinyl-fs";
import map from "map-stream";
import yargs from "yargs";
import CleanCSS from "clean-css";
import toHTML, { BASE_CSS, html } from "./html.js";

const cli = yargs(process.argv.slice(2))
  .scriptName("gmi-web")
  .command("$0 [files..]", "Convert text/gemini to text/html.", (yargs) =>
    yargs
      .example("$0 --html en $(find ~/my-capsule -name '*.gmi')")
      .example("$0 --foreground '#000000' --background '#EEEEEE' --html en < doc.gmi")
      .example("$0 --body < ~/my-capsule/index.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",
    },
    html: {
      type: "string",
      requiresArg: true,
    },
    charset: {
      type: "string",
      default: "utf-8",
      requiresArg: true,
    },
    css: {
      choices: ["gmi.css", "base", "none"],
      default: "gmi.css",
    },
  });

cli.options({
  image: {
    type: "array",
    requiresArg: true,
  },
  audio: {
    type: "array",
    requiresArg: true,
  },
  video: {
    type: "array",
    requiresArg: true,
  },
});

// TODO: automatically pull these in from gmi.css (also for gmi.css(5))
const GMI_CSS_VARS = [
  "body-width",
  "foreground",
  "background",
  "p-size",
  "p-indent",
  "p-line-height",
  "a-size",
  "pre-size",
  "pre-line-height",
  "h1-size",
  "h2-size",
  "h3-size",
  "heading-line-height",
  "ul-size",
  "ul-line-height",
  "blockquote-size",
  "blockquote-line-height",
  "mono",
  "serif",
  "sans-serif",
].map((key) => {
  cli.option(key);
  cli.conflicts(key, "body");
  return key;
});

const argv = cli
  .conflicts("html", "body")
  .group(["html", "css", "body"], "Core:")
  .group(GMI_CSS_VARS, "gmi.css:")
  .group(["image", "audio", "video"], "Inline Media:")
  .alias("html", "language")
  .alias("html", "lang")
  .config()
  .showHelpOnFail(true)
  .help().argv;

let styles = "";
if (argv.css === "gmi.css") {
  styles = GMI_CSS_VARS.reduce((style, key) => {
    if (argv[key]) {
      style += `--${key}: ${argv[key]};`;
    }
  }, styles);

  argv.css = new CleanCSS().minify(
    readFileSync(
      // TODO import.meta.resolve is supposed to accomplish this without "path"
      path.resolve(
        path.dirname(new URL(import.meta.url).pathname),
        "./gmi.css"
      ),
      "utf-8"
    )
  ).styles;
} else if (argv.css === "base") {
  argv.css = BASE_CSS;
} else {
  argv.css = "";
}

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

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