export type DashboardRange = 'day' | 'week' | 'month' | 'season';
export type TransactionStatus = 'all' | 'Paid' | 'Verified' | 'Failed' | 'Reversed';

export interface DashboardFilters {
  range: DashboardRange;
  period: string;
  terminal: string;
  status: TransactionStatus;
  minAmount: number | null;
  maxAmount: number | null;
}

const ranges = new Set<DashboardRange>(['day', 'week', 'month', 'season']);
const statuses = new Set<TransactionStatus>(['all', 'Paid', 'Verified', 'Failed', 'Reversed']);

const periodPatterns: Record<DashboardRange, RegExp> = {
  day: /^d-\d{4}-\d{2}-\d{2}$/,
  week: /^w-\d{4}-\d{2}-\d{2}$/,
  month: /^jm-\d{4}-\d{2}$/,
  season: /^ps-\d{4}-(?:01|04|07|10)$/,
};

function positiveAmount(value: string | null): number | null {
  if (!value) return null;
  const parsed = Number(value);
  return Number.isSafeInteger(parsed) && parsed >= 0 ? parsed : null;
}

export function parseDashboardFilters(
  query: URLSearchParams,
  terminalIds: readonly string[] = [],
): DashboardFilters {
  const rawRange = query.get('range') as DashboardRange | null;
  const range = rawRange && ranges.has(rawRange) ? rawRange : 'month';
  const rawPeriod = query.get('period');
  const rawStatus = query.get('status') as TransactionStatus | null;
  const rawTerminal = query.get('terminal');
  let minAmount = positiveAmount(query.get('minAmount'));
  let maxAmount = positiveAmount(query.get('maxAmount'));

  if (minAmount !== null && maxAmount !== null && minAmount > maxAmount) {
    [minAmount, maxAmount] = [maxAmount, minAmount];
  }

  return {
    range,
    period: rawPeriod && periodPatterns[range].test(rawPeriod) ? rawPeriod : '',
    terminal: rawTerminal && terminalIds.includes(rawTerminal) ? rawTerminal : 'all',
    status: rawStatus && statuses.has(rawStatus) ? rawStatus : 'all',
    minAmount,
    maxAmount,
  };
}

export function setDashboardQuery(
  current: URL,
  updates: Partial<Record<keyof DashboardFilters, string | number | null>>,
): URL {
  const next = new URL(current);
  for (const [key, value] of Object.entries(updates)) {
    if (value === null || value === '' || value === 'all') next.searchParams.delete(key);
    else next.searchParams.set(key, String(value));
  }
  return next;
}

export const rangeLabels: Record<DashboardRange, string> = {
  day: 'روزانه',
  week: 'هفتگی',
  month: 'ماهانه',
  season: 'فصلی',
};

export const rangePeriodTypes: Record<DashboardRange, string> = {
  day: 'DAY',
  week: 'WEEK',
  month: 'JALALI_MONTH',
  season: 'PERSIAN_SEASON',
};