#!/usr/bin/env node
import path from "node:path";
import process from "node:process";
import { formatMessages } from "esbuild";
import { buildModuleUi, ModuleUiBuildError } from "./build-module-ui.js";

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}

/**
 * `ekklesia-build-module-ui` — the canonical module UI build command, run from a module directory.
 *
 * A module with neither UI role is not an error: backend-only modules stay first-class and this
 * command reports that there was nothing to build and exits successfully. When one or both roles
 * are declared, this one command builds exactly that set.
 */
async function main(): Promise<number> {
  const moduleDirectory = process.argv[2] ?? process.cwd();

  try {
    const result = await buildModuleUi({ moduleDirectory });
    if (result.artifacts.length === 0) {
      process.stdout.write("No module UI entrypoints declared; skipping the module UI build.\n");
      return 0;
    }
    for (const artifact of result.artifacts) {
      process.stdout.write(
        `Built module UI (${artifact.contributionId ?? artifact.kind}): ${path.relative(moduleDirectory, artifact.outputFile)}\n`,
      );
    }
    return 0;
  } catch (error) {
    if (error instanceof ModuleUiBuildError) {
      process.stderr.write(`${error.kind ? `${error.kind}: ` : ""}${error.message}\n`);
      // esbuild's own diagnostics carry the file, line, and reason a developer needs. They are
      // printed here, never folded into the sanitized error message itself.
      const diagnostics = isRecord(error) ? error.diagnostics : undefined;
      if (Array.isArray(diagnostics) && diagnostics.length > 0) {
        const formatted = await formatMessages(diagnostics, { kind: "error", color: true });
        process.stderr.write(formatted.join(""));
      }
      return 1;
    }
    process.stderr.write("The module UI build failed unexpectedly.\n");
    return 1;
  }
}

process.exitCode = await main();