import type { Deal, TravelPreferences } from "./types";

// Destination feature profiles (0-10 ratings for common destinations)
const DESTINATION_PROFILES: Record<string, TravelPreferences> = {
  // Caribbean
  "CUN": { beach: 10, pool: 9, golf: 6, spa: 8, food: 8, nightlife: 9, shopping: 7, culture: 5, outdoor: 8, family: 9 },
  "PUJ": { beach: 10, pool: 9, golf: 7, spa: 8, food: 7, nightlife: 8, shopping: 6, culture: 4, outdoor: 7, family: 9 },
  "MBJ": { beach: 10, pool: 8, golf: 5, spa: 7, food: 8, nightlife: 7, shopping: 5, culture: 6, outdoor: 9, family: 8 },
  "NAS": { beach: 9, pool: 8, golf: 6, spa: 6, food: 7, nightlife: 8, shopping: 7, culture: 5, outdoor: 8, family: 8 },
  
  // Europe
  "LHR": { beach: 2, pool: 5, golf: 6, spa: 7, food: 9, nightlife: 8, shopping: 10, culture: 10, outdoor: 6, family: 7 },
  "CDG": { beach: 1, pool: 6, golf: 5, spa: 8, food: 10, nightlife: 9, shopping: 10, culture: 10, outdoor: 5, family: 7 },
  "FCO": { beach: 3, pool: 6, golf: 4, spa: 7, food: 10, nightlife: 8, shopping: 9, culture: 10, outdoor: 7, family: 8 },
  "BCN": { beach: 8, pool: 7, golf: 5, spa: 7, food: 9, nightlife: 10, shopping: 8, culture: 9, outdoor: 7, family: 7 },
  "AMS": { beach: 1, pool: 5, golf: 4, spa: 6, food: 8, nightlife: 9, shopping: 8, culture: 9, outdoor: 6, family: 7 },
  
  // USA
  "LAX": { beach: 8, pool: 7, golf: 7, spa: 8, food: 9, nightlife: 9, shopping: 9, culture: 8, outdoor: 8, family: 7 },
  "LAS": { beach: 0, pool: 9, golf: 8, spa: 10, food: 9, nightlife: 10, shopping: 10, culture: 5, outdoor: 5, family: 6 },
  "MIA": { beach: 9, pool: 8, golf: 7, spa: 8, food: 8, nightlife: 10, shopping: 9, culture: 7, outdoor: 8, family: 7 },
  "MCO": { beach: 5, pool: 10, golf: 8, spa: 7, food: 7, nightlife: 7, shopping: 8, culture: 6, outdoor: 6, family: 10 },
  "HNL": { beach: 10, pool: 8, golf: 9, spa: 8, food: 8, nightlife: 7, shopping: 7, culture: 8, outdoor: 10, family: 9 },
  
  // Default fallback
  "DEFAULT": { beach: 5, pool: 5, golf: 5, spa: 5, food: 5, nightlife: 5, shopping: 5, culture: 5, outdoor: 5, family: 5 }
};

function calculatePreferenceMatch(deal: Deal, preferences?: TravelPreferences): number {
  if (!preferences || !deal.destination) return 0;
  
  const destProfile = DESTINATION_PROFILES[deal.destination.toUpperCase()] || DESTINATION_PROFILES["DEFAULT"];
  let matchScore = 0;
  let totalWeight = 0;
  
  // Calculate how well the destination matches user preferences
  for (const [feature, userRating] of Object.entries(preferences)) {
    if (userRating && userRating > 0) {
      const destRating = destProfile[feature as keyof TravelPreferences] || 5;
      // Higher user rating + higher destination rating = better match
      matchScore += (userRating * destRating);
      totalWeight += (userRating * 10); // max possible for this feature
    }
  }
  
  // Normalize to 0-1000 scale
  if (totalWeight > 0) {
    return (matchScore / totalWeight) * 1000;
  }
  
  return 0;
}

export function scoreDeal(d: Deal, preferences?: TravelPreferences): number {
  // Very simple scoring: prefer lower price, direct, reasonable nights
  let score = 0;
  if (typeof d.price === "number") score += Math.max(0, 10000 - d.price);
  if (d.stops === 0) score += 500;
  if (typeof d.nights === "number") {
    const target = 7;
    score += Math.max(0, 300 - Math.abs(d.nights - target) * 40);
  }
  if (d.source.includes("Deals")) score += 150; // curated deal sites
  
  // Add preference matching bonus
  const preferenceBonus = calculatePreferenceMatch(d, preferences);
  score += preferenceBonus;
  
  return score;
}