const OPERATION_TIMING_SCHEMA_VERSION = 'ltjt-operation-timing-v1';
const CODE_PATTERN = /^[a-z][a-z0-9_.:-]{0,79}$/i;
const MAX_STAGES = 64;
const MAX_DETAILS = 48;
const MAX_COUNTERS = 24;
const MAX_DURATION_MS = 7 * 24 * 60 * 60 * 1000;
const ALLOWED_STAGE_CODES = new Set([
  'auto_executor',
  'automation_disabled',
  'batch_fallback',
  'batch_fallback_error',
  'browser_dry_run',
  'browser_execution',
  'cancelled',
  'capability_check',
  'erp_keepalive_degraded',
  'erp_resolution',
  'execution_gate',
  'execution_timeout',
  'extension_error',
  'lifecycle_business_blocked',
  'lifecycle_completed',
  'lifecycle_live',
  'lifecycle_live_submit',
  'lifecycle_preflight',
  'lifecycle_reconciliation',
  'lifecycle_route_preparation',
  'live_submit',
  'open_order_form',
  'open_team_batch_form',
  'post_resolution_execution_gate',
  'preflight',
  'queued',
  'reconciliation',
  'unknown_stage',
  'validation',
  'verification',
  'wait_order_form',
  'wait_team_batch_form'
]);
const ALLOWED_STATUSES = new Set([
  'accepted',
  'blocked',
  'cancelled',
  'completed',
  'dry_run',
  'execution_uncertain',
  'failed',
  'mixed',
  'reconciliation_pending',
  'running',
  'saved_unverified',
  'skipped',
  'unknown'
]);
const ALLOWED_ACTION_CODES = new Set([
  'cleanup_completed_lifecycle_dialog',
  'create_split_child_live',
  'create_split_parent_live',
  'export_confirmation_sources',
  'inspect_operation_context',
  'live_submit_approved',
  'live_submit_lifecycle_operation',
  'live_submit_team_batch_approved',
  'open_order_form',
  'open_team_batch_form',
  'ping_order_frame',
  'ping_team_batch_frame',
  'preflight_lifecycle_operation',
  'preflight_raw_instruction',
  'preflight_team_batch_native',
  'prepare_lifecycle_operation',
  'resolve_lifecycle_operation',
  'return_to_order_list',
  'unknown_action',
  'verify_lifecycle_operation',
  'verify_order_marker',
  'verify_team_batch_receipts'
]);
const ALLOWED_DETAIL_CODES = new Set([
  'executor.erp_keepalive_setup',
  'preflight_customer_restore',
  'preflight_lookup.customer',
  'preflight_lookup.parallel_wall',
  'preflight_lookup.product',
  'preflight_lookup.route',
  'preflight_lookup.staff',
  'preflight_product_linkage',
  'preflight_submit_intercept',
  'result_publish.prepare',
  'storage_prune.local_history',
  'storage_queue.accept_execution',
  'storage_queue.execution_state',
  'storage_queue.result_state',
  'storage_read.accept_execution',
  'storage_read.automation_setting',
  'storage_read.execution_record',
  'storage_read.execution_state',
  'storage_read.result_state',
  'storage_read.task_payload',
  'storage_write.accept_execution',
  'storage_write.execution_state',
  'storage_write.last_frame',
  'storage_write.last_live_submit',
  'storage_write.last_preflight',
  'storage_write.last_return_to_list',
  'storage_write.last_verification',
  'storage_write.result_state',
  'tab_lookup.cache_hit',
  'tab_lookup.create',
  'tab_lookup.find_or_open',
  'tab_lookup.host_permission',
  'tab_lookup.query',
  'tab_lookup.wait_ready'
]);
const ALLOWED_COUNTERS = new Set([
  'cache_hit_count',
  'call_count',
  'created_count',
  'execution_count',
  'failure_count',
  'frame_count',
  'protected_root_count',
  'quiet_wait_ms',
  'removed_execution_count',
  'removed_result_count',
  'removed_root_count',
  'removed_task_count',
  'removed_timing_count',
  'request_count',
  'result_count',
  'retained_root_count',
  'sample_count',
  'stable_sample_count',
  'submit_count',
  'tab_count',
  'task_count',
  'timing_count'
]);

function record(value: unknown): Record<string, unknown> | null {
  return value && typeof value === 'object' && !Array.isArray(value)
    ? value as Record<string, unknown>
    : null;
}

function code(value: unknown, fallback = ''): string {
  const normalized = String(value || '').trim();
  return CODE_PATTERN.test(normalized) ? normalized : fallback;
}

function statusCode(value: unknown, fallback = 'unknown'): string {
  const normalized = code(value);
  return ALLOWED_STATUSES.has(normalized) ? normalized : fallback;
}

function stageCode(value: unknown): string {
  const normalized = code(value);
  return ALLOWED_STAGE_CODES.has(normalized) ? normalized : '';
}

function stepCode(value: unknown): string {
  const normalized = code(value);
  if (normalized === 'script_injection') return normalized;
  if (ALLOWED_DETAIL_CODES.has(normalized)) return normalized;
  const matched = normalized.match(/^(action_roundtrip|action_runtime|network_wait)\.(.+)$/u);
  return matched && ALLOWED_ACTION_CODES.has(matched[2]) ? normalized : '';
}

function duration(value: unknown): number {
  const number = Number(value);
  if (!Number.isFinite(number) || number <= 0) return 0;
  return Math.min(MAX_DURATION_MS, Math.round(number));
}

function count(value: unknown): number {
  const number = Number(value);
  if (!Number.isFinite(number) || number <= 0) return 0;
  return Math.min(Number.MAX_SAFE_INTEGER, Math.round(number));
}

function sanitizeCounters(value: unknown): Record<string, number> | null {
  const input = record(value);
  if (!input) return null;
  const output: Record<string, number> = {};
  for (const [rawKey, rawValue] of Object.entries(input).slice(0, MAX_COUNTERS)) {
    const key = code(rawKey);
    const number = Number(rawValue);
    if (!ALLOWED_COUNTERS.has(key) || !Number.isFinite(number) || number < 0) continue;
    output[key] = Math.min(Number.MAX_SAFE_INTEGER, Math.round(number));
  }
  return Object.keys(output).length ? output : null;
}

function sanitizeDetail(value: unknown): Record<string, unknown> | null {
  const input = record(value);
  if (!input) return null;
  const step = stepCode(input.step);
  if (!step) return null;
  const counters = sanitizeCounters(input.counters);
  return {
    step,
    status: statusCode(input.status),
    duration_ms: duration(input.duration_ms),
    ...(counters ? { counters } : {})
  };
}

function sanitizeStage(value: unknown): Record<string, unknown> | null {
  const input = record(value);
  if (!input) return null;
  const stage = stageCode(input.stage);
  if (!stage) return null;
  const details = (Array.isArray(input.details) ? input.details : [])
    .map(sanitizeDetail)
    .filter((detail): detail is Record<string, unknown> => Boolean(detail))
    .slice(0, MAX_DETAILS);
  const truncatedDetailCount = count(input.truncated_detail_count);
  return {
    stage,
    status: statusCode(input.status),
    duration_ms: duration(input.duration_ms),
    ...(details.length ? { details } : {}),
    ...(truncatedDetailCount ? { truncated_detail_count: truncatedDetailCount } : {})
  };
}

export function sanitizeOperationTiming(value: unknown): Record<string, unknown> | null {
  const input = record(value);
  if (!input || input.schema_version !== OPERATION_TIMING_SCHEMA_VERSION) return null;
  const stages = (Array.isArray(input.stages) ? input.stages : [])
    .map(sanitizeStage)
    .filter((stage): stage is Record<string, unknown> => Boolean(stage))
    .slice(0, MAX_STAGES);
  const truncatedStageCount = count(input.truncated_stage_count);
  return {
    schema_version: OPERATION_TIMING_SCHEMA_VERSION,
    status: statusCode(input.status),
    total_ms: duration(input.total_ms),
    stage_count: Math.max(stages.length, count(input.stage_count)),
    stages,
    ...(truncatedStageCount ? { truncated_stage_count: truncatedStageCount } : {})
  };
}

export { OPERATION_TIMING_SCHEMA_VERSION };