import { ArrowUpDown, Clock, TrendingUp, MapPin, MessageCircle, Zap, Shield } from 'lucide-react';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import { cn } from '@/lib/utils';

export type SortOption = 
  | 'recent'
  | 'trust'
  | 'proximity'
  | 'popular'
  | 'zaps';

interface SortDropdownProps {
  value: SortOption;
  onChange: (value: SortOption) => void;
  className?: string;
  showProximity?: boolean; // Only show if geolocation available
  contentType?: 'spots' | 'events' | 'coaches' | 'generic';
}

const SORT_OPTIONS = {
  recent: {
    label: 'Most Recent',
    icon: Clock,
    description: 'Newest first',
  },
  trust: {
    label: 'Highest Trust',
    icon: Shield,
    description: 'Most trusted creators',
  },
  proximity: {
    label: 'Closest to Me',
    icon: MapPin,
    description: 'Nearest locations',
  },
  popular: {
    label: 'Most Popular',
    icon: TrendingUp,
    description: 'Most comments/reactions',
  },
  zaps: {
    label: 'Most Zapped',
    icon: Zap,
    description: 'Highest value received',
  },
};

export function SortDropdown({ 
  value, 
  onChange, 
  className,
  showProximity = false,
  contentType = 'generic',
}: SortDropdownProps) {
  const selectedOption = SORT_OPTIONS[value];
  const Icon = selectedOption.icon;

  // Determine which sort options to show based on content type
  const availableOptions: SortOption[] = ['recent', 'trust'];
  
  if (showProximity) {
    availableOptions.push('proximity');
  }
  
  // Popular sorting available for all content types
  availableOptions.push('popular');
  
  // Zaps available for all content
  availableOptions.push('zaps');

  return (
    <Select value={value} onValueChange={(v) => onChange(v as SortOption)}>
      <SelectTrigger className={cn("w-[200px] gap-2", className)}>
        <ArrowUpDown className="h-4 w-4 text-muted-foreground" />
        <SelectValue>
          <span className="flex items-center gap-2">
            <Icon className="h-4 w-4" />
            {selectedOption.label}
          </span>
        </SelectValue>
      </SelectTrigger>
      <SelectContent>
        {availableOptions.map((option) => {
          const opt = SORT_OPTIONS[option];
          const OptionIcon = opt.icon;
          
          return (
            <SelectItem key={option} value={option}>
              <div className="flex items-center gap-2 w-full">
                <OptionIcon className="h-4 w-4 text-muted-foreground" />
                <div className="flex-1">
                  <div className="font-medium">{opt.label}</div>
                  <div className="text-xs text-muted-foreground">{opt.description}</div>
                </div>
              </div>
            </SelectItem>
          );
        })}
      </SelectContent>
    </Select>
  );
}

/**
 * Helper function to calculate popularity score for sorting
 * Based on comments, reactions, and other engagement metrics
 */
export function calculatePopularity(
  commentCount: number = 0,
  reactionCount: number = 0,
  zapCount: number = 0
): number {
  // Weighted popularity: comments worth 3x, reactions 1x, zaps 5x
  return (commentCount * 3) + (reactionCount * 1) + (zapCount * 5);
}

/**
 * Calculate distance between two coordinates in kilometers
 * Uses Haversine formula
 */
export function calculateDistance(
  lat1: number,
  lon1: number,
  lat2: number,
  lon2: number
): number {
  const R = 6371; // Earth's radius in km
  const dLat = toRad(lat2 - lat1);
  const dLon = toRad(lon2 - lon1);
  
  const a = 
    Math.sin(dLat / 2) * Math.sin(dLat / 2) +
    Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) *
    Math.sin(dLon / 2) * Math.sin(dLon / 2);
  
  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
  return R * c;
}

function toRad(degrees: number): number {
  return degrees * (Math.PI / 180);
}