#!/usr/bin/env node
import { readFileSync, existsSync } from "fs";
import path from "path";
import fs from "vinyl-fs";
import map from "map-stream";
import yargs from "yargs";
import * as CSS from "./css.js";
import toHTML, { html } 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",
    },
    html: {
      type: "string",
      requiresArg: true,
    },
    dir: {
      type: "string",
      choices: ["rtl", "ltr"],
      default: "ltr",
      requiresArg: true,
    },
    author: {
      type: "string",
      requiresArg: true,
    },
    descriptions: {
      type: "boolean",
    },
    css: {
      default: "full",
      requiresArg: true,
    },
    charset: {
      type: "string",
      hidden: true,
      default: "utf-8",
      requiresArg: true,
    },
    image: {
      type: "array",
      requiresArg: true,
    },
    audio: {
      type: "array",
      requiresArg: true,
    },
    video: {
      type: "array",
      requiresArg: true,
    },
  });

const CSS_VARS = CSS.rootVariables(CSS.FULL);
Object.keys(CSS_VARS).map((key) => {
  cli.option(key, { default: CSS_VARS[key] });
  return key;
});

const argv = cli
  .conflicts("author", "body")
  .conflicts("descriptions", "body")
  .conflicts("html", "body")
  .group(["html", "body"], "Core:")
  .group(["author", "descriptions", "css", "dir"], "HTML:")
  .group(["image", "audio", "video"], "Inline Media:")
  .group(Object.keys(CSS_VARS), "CSS:")
  .alias("html", "language")
  .alias("html", "lang")
  .coerce("css", (arg) => {
    if (arg === "full") {
      return CSS.stringify(CSS.FULL, { compress: true });
    } else if (arg === "core") {
      return CSS.stringify(CSS.CORE, { compress: true });
    } else if (arg !== "none" && arg !== "") {
      if (existsSync(path.resolve(arg))) {
        return CSS.resolve(arg, { compress: true });
      } else {
        return CSS.parse(arg);
      }
    }
  })
  .showHelpOnFail(true)
  .help().argv;

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

let styles = Object.keys(CSS_VARS).reduce((style, key) => {
  if (argv[key]) {
    style += `--${key}: ${argv[key]};`;
  }
  return style;
}, "");

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(html({ contents: gemtext }, argv));
} else {
  fs.src(argv.files)
    .pipe(
      map(
        toHTML({
          ...argv,
          styles,
        })
      )
    )
    .pipe(fs.dest((file) => path.dirname(file.path)));
}