import fs from 'node:fs';
import path from 'node:path';

const PARSE_HOST = normalizeParseHost(process.env.SMOKE_PARSE_HOST || 'https://server.fmode.cn');
const APP_ID = process.env.SMOKE_PARSE_APP_ID || 'ncloudmaster';
const SESSION_TOKEN = process.env.SMOKE_SESSION_TOKEN || '';
const CONFIRM_TEXT = 'PHYSICAL_DELETE_IP_OPERATOR_CANDIDATES';
const CONFIRM = readArg('--confirm') || process.env.IP_CLEANUP_CONFIRM || '';
const INPUT = readArg('--input') || process.env.IP_CLEANUP_REPORT || '';
const EXECUTE = CONFIRM === CONFIRM_TEXT;
const CONCURRENCY = clamp(Number(process.env.IP_CLEANUP_CONCURRENCY || readArg('--concurrency') || 2), 1, 4);
const OUTPUT_DIR = process.env.IP_CLEANUP_OUTPUT_DIR
  ? path.resolve(process.env.IP_CLEANUP_OUTPUT_DIR)
  : path.join(process.cwd(), 'tmp');

const PROJECT_KEY = 'video-workflow';
const CLASS_NAME = 'VideoWorkflowEntity';
const allowedEntityTypes = new Set([
  'ipOperator.accountSnapshot',
  'ipOperator.accountSnapshotWork',
  'ipOperator.accountSnapshotComment',
  'ipOperator.planEvidenceItem',
  'ipOperator.planCommentPainInsight',
]);
const protectedEntityTypes = new Set([
  'ipOperator.account',
  'ipOperator.profile',
  'ipOperator.plan',
]);

if (!SESSION_TOKEN) {
  console.error('Missing SMOKE_SESSION_TOKEN. Refusing to access Parse.');
  process.exit(1);
}
if (!INPUT) {
  console.error('Missing --input <cleanup-report.json> or IP_CLEANUP_REPORT.');
  process.exit(1);
}

const inputPath = path.resolve(INPUT);
const report = JSON.parse(fs.readFileSync(inputPath, 'utf8'));
const sourceCandidates = Array.isArray(report.candidates)
  ? report.candidates
  : [
    ...toArray(report.results).map((item) => ({ ...item, status: item.status || 'deleted' })),
    ...toArray(report.skipped).map((item) => ({ ...item, status: item.status || 'deleted' })),
  ];
const candidates = normalizeCandidates(sourceCandidates);

console.log(`IP operator physical cleanup input=${inputPath}`);
console.log(`mode=${EXECUTE ? 'EXECUTE_PHYSICAL_DELETE' : 'RESOLVE_ONLY_DRY_RUN'}`);
console.log(`candidateRows=${sourceCandidates.length}`);
console.log(`allowlistedTargets=${candidates.length}`);
console.log(`concurrency=${CONCURRENCY}`);
console.log('');

const me = await parseRequest('GET', '/users/me');
const ownerId = me?.objectId || '';
if (!ownerId) {
  console.error('Could not resolve current Parse user from SMOKE_SESSION_TOKEN.');
  process.exit(1);
}

const startedAt = new Date().toISOString();
const resolved = [];
let resolveIndex = 0;
await Promise.all(Array.from({ length: CONCURRENCY }, async () => {
  while (resolveIndex < candidates.length) {
    const currentIndex = resolveIndex;
    resolveIndex += 1;
    const target = candidates[currentIndex];
    resolved[currentIndex] = await resolveTarget(target, ownerId);
    if ((currentIndex + 1) % 100 === 0 || currentIndex + 1 === candidates.length) {
      console.log(`resolve progress ${currentIndex + 1}/${candidates.length}`);
    }
  }
}));

const resolvable = resolved.filter((item) => item.objectId);
const unresolved = resolved.filter((item) => !item.objectId);
console.log('');
console.log(`resolvedObjectIds=${resolvable.length}`);
console.log(`unresolved=${unresolved.length}`);

let deleteResults = [];
if (!EXECUTE) {
  console.log('');
  console.log('No physical delete executed.');
  console.log(`To execute irreversible physical delete, rerun with: --confirm ${CONFIRM_TEXT}`);
} else {
  deleteResults = [];
  let deleteIndex = 0;
  await Promise.all(Array.from({ length: CONCURRENCY }, async () => {
    while (deleteIndex < resolvable.length) {
      const currentIndex = deleteIndex;
      deleteIndex += 1;
      const target = resolvable[currentIndex];
      deleteResults[currentIndex] = await deleteTarget(target);
      if ((currentIndex + 1) % 100 === 0 || currentIndex + 1 === resolvable.length) {
        console.log(`delete progress ${currentIndex + 1}/${resolvable.length}`);
      }
    }
  }));
}

const completedAt = new Date().toISOString();
const deleteFailures = deleteResults.filter((item) => !item.ok);
const output = {
  startedAt,
  completedAt,
  mode: EXECUTE ? 'execute' : 'dry-run',
  inputPath,
  ownerId,
  sourceCandidateRows: sourceCandidates.length,
  allowlistedTargets: candidates.length,
  resolvedObjectIds: resolvable.length,
  unresolvedCount: unresolved.length,
  deleteAttempted: deleteResults.length,
  deleteSuccess: deleteResults.filter((item) => item.ok).length,
  deleteFailures: deleteFailures.length,
  resolved,
  unresolved,
  deleteResults,
};

fs.mkdirSync(OUTPUT_DIR, { recursive: true });
const outputPath = path.join(
  OUTPUT_DIR,
  `ip-operator-cleanup-physical-${EXECUTE ? 'delete' : 'dry-run'}-${safeTimestamp(completedAt)}.json`,
);
fs.writeFileSync(outputPath, `${JSON.stringify(output, null, 2)}\n`, 'utf8');

console.log('');
console.log(`Physical cleanup ${EXECUTE ? 'execute' : 'dry-run'} complete.`);
console.log(`Result report: ${outputPath}`);
if (deleteFailures.length) process.exit(1);

function normalizeCandidates(rows) {
  const seen = new Set();
  const output = [];
  for (const row of rows) {
    const entityType = String(row.entityType || '');
    const entityId = String(row.entityId || '');
    if (!entityType || !entityId) continue;
    if (protectedEntityTypes.has(entityType)) continue;
    if (!allowedEntityTypes.has(entityType)) continue;
    const key = `${entityType}:${entityId}`;
    if (seen.has(key)) continue;
    seen.add(key);
    output.push({
      accountId: row.accountId || '',
      entityType,
      entityId,
      status: row.status || '',
      reason: row.reason || '',
    });
  }
  return output;
}

async function resolveTarget(target, ownerId) {
  const where = {
    projectKey: PROJECT_KEY,
    owner: { __type: 'Pointer', className: '_User', objectId: ownerId },
    entityType: target.entityType,
    entityId: target.entityId,
  };
  const query = new URLSearchParams();
  query.set('where', JSON.stringify(where));
  query.set('limit', '2');
  query.set('keys', 'objectId,entityType,entityId,status,ownerId,projectKey,createdAt,updatedAt');
  const result = await parseRequest('GET', `/classes/${encodeURIComponent(CLASS_NAME)}?${query.toString()}`);
  const rows = Array.isArray(result.results) ? result.results : [];
  return {
    ...target,
    objectId: rows.length === 1 ? rows[0].objectId : '',
    matchedRows: rows.length,
    currentStatus: rows[0]?.status || '',
    createdAt: rows[0]?.createdAt || '',
    updatedAt: rows[0]?.updatedAt || '',
    resolveError: rows.length > 1 ? 'multiple rows matched; refusing to delete' : rows.length === 0 ? 'not found' : '',
  };
}

async function deleteTarget(target) {
  try {
    await parseRequest('DELETE', `/classes/${encodeURIComponent(CLASS_NAME)}/${encodeURIComponent(target.objectId)}`);
    return { ...target, ok: true, error: '' };
  } catch (error) {
    return { ...target, ok: false, error: error?.message || 'delete failed' };
  }
}

async function parseRequest(method, parsePath) {
  const headers = {
    Accept: 'application/json',
    'X-Parse-Application-Id': APP_ID,
    'X-Parse-Session-Token': SESSION_TOKEN,
  };
  let lastError = null;
  for (let attempt = 1; attempt <= 4; attempt += 1) {
    try {
      const response = await fetch(`${PARSE_HOST}/parse${parsePath}`, { method, headers });
      const data = await response.json().catch(() => ({}));
      if (!response.ok || data.error) {
        const error = new Error(data.error || data.message || `Parse ${method} ${parsePath} failed`);
        error.status = response.status || 500;
        error.detail = data;
        if (attempt < 4 && isRetryableError(error)) {
          await sleep(500 * attempt);
          continue;
        }
        throw error;
      }
      return data;
    } catch (error) {
      lastError = error;
      if (attempt < 4 && isRetryableError(error)) {
        await sleep(500 * attempt);
        continue;
      }
      throw error;
    }
  }
  throw lastError || new Error(`Parse ${method} ${parsePath} failed`);
}

function isRetryableError(error) {
  const status = Number(error?.status || 0);
  const message = `${error?.message || ''} ${error?.cause?.code || ''} ${error?.detail?.error || ''}`;
  return status >= 500 || /fetch failed|Failed to fetch|NetworkError|Load failed|ECONNRESET|ETIMEDOUT|EAI_AGAIN/i.test(message);
}

function readArg(name) {
  const index = process.argv.indexOf(name);
  return index >= 0 ? process.argv[index + 1] || '' : '';
}

function toArray(value) {
  return Array.isArray(value) ? value : [];
}

function normalizeParseHost(value) {
  return String(value || 'https://server.fmode.cn').replace(/\/+$/, '').replace(/\/parse$/i, '');
}

function clamp(value, min, max) {
  if (!Number.isFinite(value)) return min;
  return Math.max(min, Math.min(max, Math.floor(value)));
}

function sleep(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

function safeTimestamp(value) {
  return String(value).replace(/[:.]/g, '-');
}