export interface LegacyConsumerForPlanning {
  id: string;
  circuitNumber: string | null;
  category: string | null;
  phaseType: string | null;
  phaseCount: number | null;
}

export function normalizeCircuitNumber(value: string | null): string | null {
  if (!value) {
    return null;
  }
  const trimmed = value.trim().toUpperCase();
  if (!trimmed) {
    return null;
  }
  if (!/^-\d+F\d+$/.test(trimmed)) {
    return null;
  }
  return trimmed;
}

export function inferSectionKeyFromLegacyInput(consumer: LegacyConsumerForPlanning): string | null {
  const category = (consumer.category ?? "").toLowerCase();
  if (category.includes("light") || category.includes("beleuchtung")) {
    return "lighting";
  }
  if (consumer.phaseCount === 3) {
    return "three_phase";
  }
  if (consumer.phaseCount === 1) {
    return "single_phase";
  }

  const phaseType = (consumer.phaseType ?? "").toLowerCase();
  if (phaseType.includes("three") || phaseType.includes("3")) {
    return "three_phase";
  }
  if (phaseType.includes("single") || phaseType.includes("1")) {
    return "single_phase";
  }
  return null;
}

export function inferSectionKeyFromEquipmentIdentifier(equipmentIdentifier: string): string | null {
  if (equipmentIdentifier.startsWith("-1F")) {
    return "lighting";
  }
  if (equipmentIdentifier.startsWith("-2F")) {
    return "single_phase";
  }
  if (equipmentIdentifier.startsWith("-3F")) {
    return "three_phase";
  }
  return null;
}