/**
 * Materialisation Status Types
 *
 * Types for slot materialisation job status and manual trigger endpoints.
 * Supports status polling, rate limiting, and idempotency.
 */

export type MaterialisationJobStatus = 'idle' | 'running' | 'completed' | 'failed';

export type MaterialisationPolicyProfile = 'SAFE' | 'CLEANUP';

export interface MaterialisationPolicy {
  name: MaterialisationPolicyProfile;
  description: string;
  icon: string;
  color: string;
  badge?: string;
}

export const MATERIALISATION_POLICIES: MaterialisationPolicy[] = [
  {
    name: 'SAFE',
    description: 'Normal mode - skips overlapping slots to protect existing schedule',
    icon: '🛡️',
    color: 'blue',
  },
  {
    name: 'CLEANUP',
    description: 'Cleanup mode - removes conflicting slots (keeps bookings safe)',
    icon: '🧹',
    color: 'orange',
    badge: 'Deletes old slots',
  },
];

export interface MaterialisationRateLimit {
  can_trigger: boolean;
  next_available_at: string | null; // ISO 8601 timestamp
  cooldown_seconds: number;
}

export interface MaterialisationJobInfo {
  job_id: string;
  status: 'queued' | 'running' | 'completed' | 'failed';
  accepted_at: string; // ISO 8601 timestamp
  started_at?: string; // ISO 8601 timestamp
  completed_at?: string; // ISO 8601 timestamp
  failed_at?: string; // ISO 8601 timestamp
  policy_profile: MaterialisationPolicyProfile;
  horizon_days: number;
  slots_generated?: number;
  actor_user_id?: number;
  error?: string;
  result?: {
    created: number;
    updated: number;
    moved: number;
    cancelled: number;
    skipped: number;
    errors: string[];
  };
}

export interface MaterialisationStatus {
  status: MaterialisationJobStatus;
  last_run_at: string | null; // ISO 8601 timestamp
  last_success_at: string | null; // ISO 8601 timestamp
  last_error: string | null;
  slots_generated: number | null;
  rate_limit: MaterialisationRateLimit;
  last_job?: MaterialisationJobInfo; // Real-time job tracking (BUILD 353)
}

export interface MaterialisationTriggerRequest {
  idempotency_key: string; // UUID v4
  horizon_days?: number; // 1-28, default 7
  policy_profile?: MaterialisationPolicyProfile; // default 'SAFE'
}

export interface MaterialisationTriggerResponse {
  status: 'accepted' | 'running' | 'completed' | 'failed';
  job_id: string;
  message: string;
  duplicate?: boolean;
}

export interface MaterialisationError {
  type: string;
  title: string;
  status: number;
  detail: string;
  code: string;
  retry_after?: number; // seconds (for 429 responses)
  next_available_at?: string; // ISO 8601 timestamp (for 429 responses)
}

/**
 * Helper to calculate remaining cooldown seconds
 */
export function calculateRemainingCooldown(nextAvailableAt: string | null): number {
  if (!nextAvailableAt) return 0;

  const now = new Date();
  const next = new Date(nextAvailableAt);
  const diffMs = next.getTime() - now.getTime();

  return Math.max(0, Math.ceil(diffMs / 1000));
}

/**
 * Helper to format countdown display (e.g., "2m 34s", "45s")
 */
export function formatCountdown(seconds: number): string {
  if (seconds <= 0) return '0s';

  const minutes = Math.floor(seconds / 60);
  const remainingSeconds = seconds % 60;

  if (minutes > 0) {
    return `${minutes}m ${remainingSeconds}s`;
  }

  return `${seconds}s`;
}

/**
 * Helper to format timestamp for display
 */
export function formatTimestamp(isoString: string): string {
  const date = new Date(isoString);
  return date.toLocaleString('en-GB', {
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
    hour12: false,
  });
}

/**
 * Generate UUID v4 for idempotency keys
 */
export function generateIdempotencyKey(): string {
  return crypto.randomUUID();
}

/**
 * Calculate elapsed time in seconds since job started
 */
export function calculateElapsedTime(startTime: string): number {
  const now = new Date();
  const start = new Date(startTime);
  const diffMs = now.getTime() - start.getTime();
  return Math.floor(diffMs / 1000);
}

/**
 * Format elapsed time for display (e.g., "2m 34s", "45s")
 */
export function formatElapsedTime(seconds: number): string {
  if (seconds <= 0) return '0s';

  const minutes = Math.floor(seconds / 60);
  const remainingSeconds = seconds % 60;

  if (minutes > 0) {
    return `${minutes}m ${remainingSeconds}s`;
  }

  return `${seconds}s`;
}