/**
 * Self-test for prisma-safety-check.mjs.
 * Verifies each DROP pattern fires and the safe-SQL path passes.
 * Run with: node scripts/test-safety-check.mjs
 */

const DROP_PATTERNS = [
  /^\s*ALTER TABLE\s+\S+\s+DROP COLUMN\s+/im,
  /^\s*DROP TABLE\s+/im,
  /^\s*DROP CONSTRAINT\s+/im,
  /^\s*ALTER TABLE\s+\S+\s+DROP CONSTRAINT\s+/im,
  /^\s*ALTER COLUMN\s+\S+\s+DROP\s+/im,
  /^\s*DROP INDEX\s+/im,
];

function matches(sql) {
  return DROP_PATTERNS.some((p) => p.test(sql));
}

const cases = [
  // should block
  { sql: "ALTER TABLE \"User\" DROP COLUMN email;",          expect: true,  label: "DROP COLUMN" },
  { sql: "DROP TABLE \"OldTable\";",                         expect: true,  label: "DROP TABLE" },
  { sql: "DROP CONSTRAINT fk_user_org;",                    expect: true,  label: "DROP CONSTRAINT (bare)" },
  { sql: "ALTER TABLE \"Brand\" DROP CONSTRAINT chk_plan;", expect: true,  label: "DROP CONSTRAINT (alter)" },
  { sql: "ALTER COLUMN status DROP NOT NULL;",               expect: true,  label: "ALTER COLUMN DROP" },
  { sql: "DROP INDEX \"SiteEvent_sessionId_timestamp_idx\";",expect: true,  label: "DROP INDEX (the incident)" },
  { sql: "DROP INDEX IF EXISTS \"some_idx\";",               expect: true,  label: "DROP INDEX IF EXISTS" },
  // should pass
  { sql: "CREATE INDEX idx ON \"SiteEvent\" (\"sessionId\");", expect: false, label: "CREATE INDEX (safe)" },
  { sql: "ALTER TABLE \"Brand\" ADD COLUMN plan TEXT;",      expect: false, label: "ADD COLUMN (safe)" },
  { sql: "CREATE TABLE \"NewModel\" (id TEXT PRIMARY KEY);", expect: false, label: "CREATE TABLE (safe)" },
];

let passed = 0;
let failed = 0;
for (const c of cases) {
  const got = matches(c.sql);
  const ok = got === c.expect;
  console.log(`${ok ? "PASS" : "FAIL"} [${c.label}]`);
  if (!ok) {
    console.log(`  sql: ${c.sql}`);
    console.log(`  expected: ${c.expect}, got: ${got}`);
    failed++;
  } else {
    passed++;
  }
}
console.log(`\n${passed} passed, ${failed} failed`);
process.exit(failed > 0 ? 1 : 0);