#!/usr/bin/env bun
/**
 * graphql-schema-drift — shared CI guard that validates an MFE's inline
 * GraphQL query/mutation/subscription documents against its own configured
 * schema snapshot(s), catching the class of bug where a backend rename or
 * pagination change silently breaks a hand-rolled template-literal query that
 * `graphql-codegen` never sees (BOFF-3922; incidents BOFF-3915, BOFF-4703,
 * BOFF-3529, and the movethewheels useOrders.ts rewrite of 2026-07-25).
 *
 * Usage (from a consuming MFE repo root):
 *   bun run node_modules/@burdenoff/fe-libs/scripts/graphql-schema-drift/cli.ts [configPath]
 * or, since fe-libs declares this as a package `bin`:
 *   graphql-schema-drift [configPath]
 *
 * `configPath` defaults to `./schema-drift.config.json`. See README.md in
 * this directory for the config shape and worked examples.
 *
 * Exit code: 0 if every extracted document validates cleanly, 1 otherwise.
 */

import { existsSync, readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { runValidation } from './validate';
import type { SchemaDriftConfig } from './types';

function main(): void {
  const configPathArg = process.argv[2] ?? 'schema-drift.config.json';
  const repoRoot = process.cwd();
  const configPath = resolve(repoRoot, configPathArg);

  if (!existsSync(configPath)) {
    console.error(`[graphql-schema-drift] Config not found: ${configPath}`);
    console.error(
      'Create a schema-drift.config.json at your repo root (or pass a path as the first argument). ' +
        'See @burdenoff/fe-libs/scripts/graphql-schema-drift/README.md for the config shape.'
    );
    process.exit(1);
  }

  let config: SchemaDriftConfig;
  try {
    config = JSON.parse(readFileSync(configPath, 'utf8')) as SchemaDriftConfig;
  } catch (e) {
    console.error(`[graphql-schema-drift] Failed to parse ${configPath}: ${(e as Error).message}`);
    process.exit(1);
    return;
  }

  let report: ReturnType<typeof runValidation>;
  try {
    report = runValidation(config, repoRoot);
  } catch (e) {
    console.error(`[graphql-schema-drift] ${(e as Error).message}`);
    process.exit(1);
    return;
  }

  if (report.errors.length > 0) {
    const fileCount = new Set(report.errors.map((e) => e.file)).size;
    console.error(
      `\n[graphql-schema-drift] FAILED — ${report.errors.length} operation(s) with schema drift across ${fileCount} file(s):\n`
    );
    for (const err of report.errors) {
      const label = err.operationName ?? `block #${err.index}`;
      console.error(`  ${err.file} :: ${label}`);
      for (const msg of err.messages) {
        console.error(`    - ${msg}`);
      }
    }
    console.error(
      '\nEach of these operations must validate against at least one schema group configured in ' +
        'schema-drift.config.json. Either fix the query/mutation to match the current schema, or refresh ' +
        'the schema snapshot file(s) referenced there if the schema itself changed.\n'
    );
    process.exit(1);
  }

  console.log(
    `[graphql-schema-drift] OK — validated ${report.documentCount} operation(s) across ${report.fileCount} source file(s). 0 errors.`
  );
}

main();