export function isSuitableForDog(suitableFor?: string): boolean {
  if (!suitableFor) return true;
  const s = suitableFor.trim().toLowerCase();
  return s === "سگ" || s.includes("سگ") || s.includes("هر دو") || s.includes("مشترک") || s.includes("both") || s.includes("dog");
}

export function isSuitableForCat(suitableFor?: string): boolean {
  if (!suitableFor) return true;
  const s = suitableFor.trim().toLowerCase();
  return s === "گربه" || s.includes("گربه") || s.includes("هر دو") || s.includes("مشترک") || s.includes("both") || s.includes("cat");
}

export function isSuitableForBoth(suitableFor?: string): boolean {
  if (!suitableFor) return true;
  const s = suitableFor.trim().toLowerCase();
  if (s.includes("هر دو") || s.includes("مشترک") || s.includes("both")) return true;
  return isSuitableForDog(s) && isSuitableForCat(s);
}

export function isSpeciesCompatible(suitableFor: string | undefined, petType: string | undefined): boolean {
  if (!petType) return true;
  const isDog = petType.includes("سگ") || petType.toLowerCase().includes("dog");
  const isCat = petType.includes("گربه") || petType.toLowerCase().includes("cat");

  if (isSuitableForBoth(suitableFor)) return true;
  if (isDog) return isSuitableForDog(suitableFor);
  if (isCat) return isSuitableForCat(suitableFor);
  return true;
}

/**
 * Partial / fuzzy matching between pet medical conditions and product symptoms
 */
export function matchesMedicalSymptom(
  petConditions: string[] | undefined,
  productSymptoms: string[] | undefined,
  productBenefits?: string
): string | null {
  if (!petConditions || petConditions.length === 0) return null;

  // Filter out negative conditions like "هیچ‌کدام"
  const validConditions = petConditions.filter(
    (c) => c && !c.includes("هیچ‌کدام") && !c.includes("سلامت کامل")
  );
  if (validConditions.length === 0) return null;

  const symptoms = (productSymptoms || []).filter(Boolean);
  const benefitsText = (productBenefits || "").toLowerCase();

  for (const condition of validConditions) {
    const condNorm = condition.trim().toLowerCase();

    // Check direct symptom list
    for (const symptom of symptoms) {
      const sympNorm = symptom.trim().toLowerCase();
      if (
        condNorm.includes(sympNorm) ||
        sympNorm.includes(condNorm) ||
        // Check core keywords
        (condNorm.includes("مفصل") && sympNorm.includes("مفصل")) ||
        (condNorm.includes("گوارش") && (sympNorm.includes("گوارش") || sympNorm.includes("اسهال") || sympNorm.includes("غذا"))) ||
        (condNorm.includes("مو") && (sympNorm.includes("مو") || sympNorm.includes("پوست") || sympNorm.includes("خارش"))) ||
        (condNorm.includes("اشتها") && sympNorm.includes("اشتها")) ||
        (condNorm.includes("باردار") && sympNorm.includes("باردار")) ||
        (condNorm.includes("زایمان") && (sympNorm.includes("شیر") || sympNorm.includes("توله") || sympNorm.includes("زایمان")))
      ) {
        return condition;
      }
    }

    // Also check benefits text if available
    if (benefitsText) {
      if (
        (condNorm.includes("مفصل") && benefitsText.includes("مفصل")) ||
        (condNorm.includes("گوارش") && benefitsText.includes("گوارش")) ||
        (condNorm.includes("مو") && (benefitsText.includes("ریزش") || benefitsText.includes("پوست"))) ||
        (condNorm.includes("اشتها") && benefitsText.includes("اشتها"))
      ) {
        return condition;
      }
    }
  }

  return null;
}