// Slot Definition Types based on Backend API Contract
// Contract: docs/owners/payloads/slot-definition-api-contract.md

export type DayOfWeek = 0 | 1 | 2 | 3 | 4 | 5 | 6; // 0=Monday, 6=Sunday

export interface SlotDefinitionRule {
  weekly: boolean;
  description?: string;
}

export interface SlotDefinitionRequest {
  court_id: number;
  dow: DayOfWeek;
  starts_at: string; // HH:MM:SS format
  duration_minutes: number;
  capacity: number;
  valid_from: string; // YYYY-MM-DD
  valid_to?: string; // YYYY-MM-DD, optional
  rule?: SlotDefinitionRule;
}

export interface SlotDefinition extends SlotDefinitionRequest {
  slot_definition_id: number;
  created_at: string; // ISO 8601
  updated_at: string; // ISO 8601
  updated_by_app_user_id: number;
}

export interface ValidationError {
  field: string;
  message: string;
}

export interface SlotDefinitionError {
  type: string;
  title: string;
  status: number;
  detail: string;
  code: string;
  errors?: ValidationError[];
}

// Helper constants
export const DAY_NAMES: Record<DayOfWeek, string> = {
  0: 'Monday',
  1: 'Tuesday',
  2: 'Wednesday',
  3: 'Thursday',
  4: 'Friday',
  5: 'Saturday',
  6: 'Sunday',
};

export const DAY_NAMES_SHORT: Record<DayOfWeek, string> = {
  0: 'Mon',
  1: 'Tue',
  2: 'Wed',
  3: 'Thu',
  4: 'Fri',
  5: 'Sat',
  6: 'Sun',
};

// Helper to format time for display
export function formatTime(timeStr: string): string {
  // Convert HH:MM:SS to HH:MM
  return timeStr.substring(0, 5);
}

// Helper to format time for API
export function formatTimeForAPI(timeStr: string): string {
  // Ensure HH:MM:SS format
  if (timeStr.length === 5) {
    return `${timeStr}:00`;
  }
  return timeStr;
}

// Helper to calculate end time
export function calculateEndTime(startTime: string, durationMinutes: number): string {
  const [hours, minutes] = startTime.split(':').map(Number);
  const totalMinutes = hours * 60 + minutes + durationMinutes;
  const endHours = Math.floor(totalMinutes / 60);
  const endMinutes = totalMinutes % 60;
  return `${String(endHours).padStart(2, '0')}:${String(endMinutes).padStart(2, '0')}`;
}