'use strict';

const USAGE = `usage: sporel-mapper <subcommand> [args...]

Subcommands:
  encode <atlas_idx> <tile_id> [rotation]
      Print the packed-u32 GID for the given components.

  decode <gid>
      Print the (atlas, tile, rotation) components of a GID.

  build <spec.txt> <out.json> [--atlas-dir <path> ...]
      Compile a text-DSL map spec into a v2 map JSON file.

  inspect <map.json> [--atlas-dir <path> ...]
      Print a human-readable stats report for a v2 map.

Options:
  -h, --help    Show this message.
`;

function run(argv, { out, err }) {
  if (argv.length === 0) {
    err.write(USAGE);
    return 1;
  }
  const [head, ...rest] = argv;
  if (head === '-h' || head === '--help') {
    out.write(USAGE);
    return 0;
  }
  const handlers = {
    encode: require('./commands/encode'),
    decode: require('./commands/decode'),
    build: require('./commands/build'),
    inspect: require('./commands/inspect'),
  };
  const handler = handlers[head];
  if (!handler) {
    err.write(`unknown subcommand: ${head}\n${USAGE}`);
    return 1;
  }
  return handler.run(rest, { out, err });
}

module.exports = { run };