import {
  bundledReferenceIndex,
  getBundledReference,
  referenceRevision,
} from "./lib/bundled-references";
import { assertNoUnknownFlags, CliArgError, hasFlag } from "./lib/cli-args";

export const REFERENCE_HELP = `Usage: dench reference <name> [--json]
  dench reference dench            Read the bundled SKILL.md
  dench reference crm              Read the bundled CRM reference
  dench reference --list [--json]  List exact bundled paths and revision
References match this installed CLI version and are read locally without signing in.`;

export async function runReferenceCommand(argv: string[]): Promise<void> {
  const args = [...argv];
  const json = hasFlag(args, "--json");
  const list = hasFlag(args, "--list");
  assertNoUnknownFlags(args, "reference");
  if (list) {
    if (args.length)
      throw new CliArgError("--list does not accept a reference name");
    const index = bundledReferenceIndex();
    console.log(
      json
        ? JSON.stringify(index)
        : `Revision: ${index.revision}\n${index.references.map((entry) => entry.path).join("\n")}`,
    );
    return;
  }
  if (args.length !== 1) throw new CliArgError(REFERENCE_HELP);
  const name = args[0];
  const path = /^(dench|skill(?:\.md)?)$/i.test(name)
    ? "SKILL.md"
    : /^[A-Za-z0-9_-]+(?:\.md)?$/i.test(name)
      ? `references/${name.replace(/\.md$/i, "").toUpperCase()}.md`
      : name;
  const content = getBundledReference(path);
  if (content === undefined)
    throw new CliArgError(
      `Unknown bundled reference: ${name}. Run dench reference --list.`,
    );
  console.log(
    json
      ? JSON.stringify({ path, revision: referenceRevision, content })
      : content,
  );
}