import React, { useState } from 'react';
import { cn } from '@/lib/utils';

/**
 * Badge configuration for the Avatar component
 */
interface AvatarBadge {
  /**
   * Number to display in the badge (hidden if dot is true)
   */
  count?: number;

  /**
   * Color variant of the badge
   * @default 'primary'
   */
  color?: 'primary' | 'destructive' | 'success';

  /**
   * Show as a small dot instead of a numbered badge
   * @default false
   */
  dot?: boolean;
}

/**
 * AvatarProps - Propriétés du composant Avatar
 *
 * @interface AvatarProps
 */
interface AvatarProps {
  /**
   * URL de l'image de l'avatar
   */
  src?: string;

  /**
   * Texte alternatif de l'avatar
   *
   * @default 'Avatar'
   */
  alt?: string;

  /**
   * Texte de fallback utilisé pour générer les initiales si pas d'image
   */
  fallback?: string;

  /**
   * Taille de l'avatar
   *
   * - `xs`: 6x6 (24px)
   * - `sm`: 8x8 (32px)
   * - `md`: 10x10 (40px) - par défaut
   * - `lg`: 12x12 (48px)
   * - `xl`: 16x16 (64px)
   * - `2xl`: 24x24 (96px)
   * - `3xl`: 32x32 (128px)
   *
   * @default 'md'
   */
  size?: 'xs' | 'sm' | 'md' | 'lg' | 'xl' | '2xl' | '3xl';

  /**
   * Statut de présence à afficher (indicateur coloré)
   *
   * - `online`: Vert (lime)
   * - `offline`: Gris
   * - `away`: Or
   * - `idle`: Or
   * - `busy`: Rouge
   * - `dnd`: Rouge (do not disturb)
   */
  status?: 'online' | 'offline' | 'away' | 'busy' | 'idle' | 'dnd';

  /**
   * Badge overlay configuration
   */
  badge?: AvatarBadge;

  /**
   * Classes CSS personnalisées
   */
  className?: string;

  /**
   * Fonction appelée lors du clic sur l'avatar
   */
  onClick?: () => void;
}

/**
 * Avatar - Composant d'avatar avec design system SUMI
 *
 * Composant d'avatar pour afficher des images de profil ou des initiales.
 * Supporte les statuts de présence et plusieurs tailles.
 *
 * @example
 * ```tsx
 * // Avatar avec image
 * <Avatar src="/avatar.jpg" alt="John Doe" />
 *
 * // Avatar avec initiales
 * <Avatar fallback="John Doe" size="lg" />
 *
 * // Avatar avec statut
 * <Avatar
 *   src="/avatar.jpg"
 *   alt="Jane Doe"
 *   status="online"
 * />
 *
 * // Avatar avec badge
 * <Avatar
 *   src="/avatar.jpg"
 *   alt="Jane Doe"
 *   badge={{ count: 3, color: 'destructive' }}
 * />
 * ```
 *
 * @component
 * @param {AvatarProps} props - Propriétés du composant
 * @returns {JSX.Element} Avatar circulaire avec image ou initiales
 */

export const Avatar = React.forwardRef<HTMLDivElement, AvatarProps>(
  (
    {
      src,
      alt = 'Avatar',
      fallback,
      size = 'md',
      status,
      badge,
      className = '',
      onClick,
    },
    ref,
  ) => {
    const [isLoaded, setIsLoaded] = useState(false);
    const [hasError, setHasError] = useState(false);

    const sizeClasses = {
      xs: 'w-6 h-6 text-[10px]',
      sm: 'w-8 h-8 text-xs',
      md: 'w-10 h-10 text-sm',
      lg: 'w-12 h-12 text-base',
      xl: 'w-16 h-16 text-lg',
      '2xl': 'w-24 h-24 text-xl',
      '3xl': 'w-32 h-32 text-2xl',
    };

    const statusColors = {
      online: 'bg-success',
      offline: 'bg-muted',
      away: 'bg-warning',
      idle: 'bg-warning',
      busy: 'bg-destructive',
      dnd: 'bg-destructive',
    };

    const statusSize = {
      xs: 'w-1.5 h-1.5 border',
      sm: 'w-2 h-2 border',
      md: 'w-2.5 h-2.5 border-2',
      lg: 'w-3 h-3 border-2',
      xl: 'w-4 h-4 border-2',
      '2xl': 'w-5 h-5 border-4',
      '3xl': 'w-6 h-6 border-4',
    };

    const badgeColors = {
      primary: 'bg-primary text-primary-foreground',
      destructive: 'bg-destructive text-destructive-foreground',
      success: 'bg-success text-success-foreground',
    };

    const badgeSizeClasses = {
      xs: 'w-2.5 h-2.5 text-[6px]',
      sm: 'w-3 h-3 text-[7px]',
      md: 'w-4 h-4 text-[8px]',
      lg: 'w-4.5 h-4.5 text-[9px]',
      xl: 'w-5 h-5 text-[10px]',
      '2xl': 'w-6 h-6 text-xs',
      '3xl': 'w-8 h-8 text-sm',
    };

    const badgeDotSizeClasses = {
      xs: 'w-1.5 h-1.5',
      sm: 'w-2 h-2',
      md: 'w-2.5 h-2.5',
      lg: 'w-3 h-3',
      xl: 'w-3.5 h-3.5',
      '2xl': 'w-4 h-4',
      '3xl': 'w-5 h-5',
    };

    const getInitials = (name?: string): string => {
      if (!name) return '?';
      const parts = name.trim().split(' ');
      if (parts.length >= 2) {
        return (parts[0][0] + parts[parts.length - 1][0]).toUpperCase();
      }
      return name.substring(0, 2).toUpperCase();
    };

    const initials = getInitials(fallback || alt);

    const showFallback = !src || hasError;

    return (
      <div
        ref={ref}
        className={cn(
          'relative inline-block active:scale-95 transition-transform',
          className,
          onClick ? 'cursor-pointer' : '',
        )}
        onClick={onClick}
      >
        <div
          className={cn(
            sizeClasses[size],
            'rounded-full overflow-hidden bg-card border border-border flex items-center justify-center relative',
          )}
        >
          {showFallback ? (
            <span className="font-bold text-muted-foreground">{initials}</span>
          ) : (
            <>
              {!isLoaded && (
                <div
                  className="absolute inset-0 rounded-full bg-muted animate-pulse"
                  aria-hidden="true"
                />
              )}
              <img
                src={src}
                alt={alt}
                onLoad={() => setIsLoaded(true)}
                onError={() => {
                  setHasError(true);
                  setIsLoaded(true);
                }}
                className={cn(
                  'w-full h-full object-cover transition-opacity duration-200',
                  isLoaded ? 'opacity-100' : 'opacity-0',
                )}
              />
            </>
          )}
        </div>

        {status && (
          <span
            className={cn(
              'absolute bottom-0 right-0 rounded-full border-background',
              statusColors[status],
              statusSize[size],
            )}
          ></span>
        )}

        {badge && (
          <span
            className={cn(
              'absolute -top-0.5 -right-0.5 rounded-full border-2 border-background flex items-center justify-center font-bold leading-none',
              badgeColors[badge.color ?? 'primary'],
              badge.dot
                ? badgeDotSizeClasses[size]
                : badgeSizeClasses[size],
            )}
          >
            {!badge.dot && badge.count != null ? badge.count : null}
          </span>
        )}
      </div>
    );
  },
);
Avatar.displayName = 'Avatar';

// Compatibility exports (for existing code using AvatarImage, AvatarFallback)
export const AvatarImage: React.FC<{
  src?: string;
  alt?: string;
  className?: string;
}> = ({ src, alt, className }) => {
  if (!src) return null;
  return <img src={src} alt={alt} className={className} />;
};

export const AvatarFallback: React.FC<{
  children: React.ReactNode;
  className?: string;
}> = ({ children, className }) => {
  return <span className={className}>{children}</span>;
};

export const AvatarRoot: React.FC<{
  children: React.ReactNode;
  className?: string;
}> = ({ children, className }) => {
  return <div className={className}>{children}</div>;
};