'use client'

import * as React from 'react'
import { cn } from '@/lib/utils'
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'

// Icons
const SendIcon = () => (
  <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor">
    <path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z" />
  </svg>
)

const EmojiIcon = () => (
  <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
    <circle cx="12" cy="12" r="10" />
    <path d="M8 14s1.5 2 4 2 4-2 4-2" />
    <line x1="9" y1="9" x2="9.01" y2="9" />
    <line x1="15" y1="9" x2="15.01" y2="9" />
  </svg>
)

const AttachIcon = () => (
  <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
    <path d="M21.44 11.05l-9.19 9.19a6 6 0 0 1-8.49-8.49l9.19-9.19a4 4 0 0 1 5.66 5.66l-9.2 9.19a2 2 0 0 1-2.83-2.83l8.49-8.48" />
  </svg>
)

// Typing indicator dots
function TypingIndicator({ className }: { className?: string }) {
  return (
    <div className={cn('flex items-center gap-1 px-3 py-2 bg-muted rounded-2xl rounded-bl-sm w-fit', className)}>
      {[0, 1, 2].map((i) => (
        <span
          key={i}
          className="size-1.5 bg-muted-foreground rounded-full animate-[typing_1.4s_ease-in-out_infinite]"
          style={{ animationDelay: `${i * 0.2}s` }}
        />
      ))}
    </div>
  )
}

// Single message bubble
interface MessageProps {
  content: string
  sender: {
    name: string
    avatar?: string
    initials: string
  }
  timestamp?: string
  isOwn?: boolean
  status?: 'sent' | 'delivered' | 'read'
  reactions?: { emoji: string; count: number }[]
  className?: string
}

function Message({
  content,
  sender,
  timestamp,
  isOwn = false,
  status,
  reactions,
  className,
}: MessageProps) {
  return (
    <div className={cn(
      'flex gap-2.5 max-w-[80%]',
      isOwn && 'flex-row-reverse self-end',
      className
    )}>
      {!isOwn && (
        <Avatar size="sm" className="flex-shrink-0">
          {sender.avatar ? (
            <AvatarImage src={sender.avatar || "/placeholder.svg"} alt={sender.name} />
          ) : null}
          <AvatarFallback>{sender.initials}</AvatarFallback>
        </Avatar>
      )}
      
      <div className={cn('flex flex-col gap-1', isOwn && 'items-end')}>
        {!isOwn && (
          <span className="text-xs font-medium text-muted-foreground">
            {sender.name}
          </span>
        )}
        
        <div className={cn(
          'px-3.5 py-2 rounded-2xl text-sm leading-relaxed',
          isOwn
            ? 'bg-primary text-primary-foreground rounded-br-sm'
            : 'bg-muted text-foreground rounded-bl-sm'
        )}>
          {content}
        </div>
        
        {reactions && reactions.length > 0 && (
          <div className="flex items-center gap-1 -mt-1">
            {reactions.map((reaction, i) => (
              <span
                key={i}
                className="inline-flex items-center gap-0.5 px-1.5 py-0.5 text-xs bg-muted rounded-full"
              >
                {reaction.emoji} {reaction.count > 1 && reaction.count}
              </span>
            ))}
          </div>
        )}
        
        {(timestamp || status) && (
          <div className="flex items-center gap-1.5 text-[10px] text-muted-foreground">
            {timestamp && <span>{timestamp}</span>}
            {isOwn && status && (
              <span className={cn(
                status === 'read' && 'text-primary'
              )}>
                {status === 'sent' && '✓'}
                {status === 'delivered' && '✓✓'}
                {status === 'read' && '✓✓'}
              </span>
            )}
          </div>
        )}
      </div>
    </div>
  )
}

// Chat container
interface ChatProps {
  title?: string
  subtitle?: string
  messages?: MessageProps[]
  className?: string
  onSend?: (message: string) => void
  showTyping?: boolean
}

function Chat({
  title = 'Chat',
  subtitle,
  messages = [],
  className,
  onSend,
  showTyping = false,
}: ChatProps) {
  const [inputValue, setInputValue] = React.useState('')
  const messagesEndRef = React.useRef<HTMLDivElement>(null)

  const handleSend = () => {
    if (inputValue.trim() && onSend) {
      onSend(inputValue.trim())
      setInputValue('')
    }
  }

  const handleKeyDown = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter' && !e.shiftKey) {
      e.preventDefault()
      handleSend()
    }
  }

  return (
    <div className={cn(
      'flex flex-col h-[450px] bg-card border border-border rounded-xl overflow-hidden',
      className
    )}>
      {/* Header */}
      <div className="flex items-center justify-between px-4 py-3 border-b border-border bg-muted/30">
        <div className="flex items-center gap-3">
          <div className="relative">
            <div className="size-2 bg-success rounded-full absolute -top-0.5 -right-0.5 shadow-[0_0_8px_oklch(0.72_0.19_145_/_0.6)]" />
            <span className="text-lg">💬</span>
          </div>
          <div>
            <h3 className="text-sm font-semibold">{title}</h3>
            {subtitle && (
              <p className="text-xs text-muted-foreground">{subtitle}</p>
            )}
          </div>
        </div>
        <Button size="icon-sm" variant="ghost">
          <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
            <circle cx="12" cy="12" r="1.5" />
            <circle cx="6" cy="12" r="1.5" />
            <circle cx="18" cy="12" r="1.5" />
          </svg>
        </Button>
      </div>

      {/* Messages area */}
      <div className="flex-1 overflow-y-auto p-4 space-y-4">
        {messages.map((message, i) => (
          <Message key={i} {...message} />
        ))}
        
        {showTyping && <TypingIndicator />}
        
        <div ref={messagesEndRef} />
      </div>

      {/* Input area */}
      <div className="p-3 border-t border-border bg-muted/30">
        <div className="flex items-center gap-2">
          <Button size="icon-sm" variant="ghost" className="flex-shrink-0">
            <AttachIcon />
          </Button>
          <Button size="icon-sm" variant="ghost" className="flex-shrink-0">
            <EmojiIcon />
          </Button>
          <Input
            placeholder="Type a message..."
            value={inputValue}
            onChange={(e) => setInputValue(e.target.value)}
            onKeyDown={handleKeyDown}
            className="flex-1 h-9 bg-background"
          />
          <Button
            size="icon-sm"
            className="flex-shrink-0"
            disabled={!inputValue.trim()}
            onClick={handleSend}
          >
            <SendIcon />
          </Button>
        </div>
      </div>
    </div>
  )
}

// Presence indicator
interface PresenceProps {
  status: 'online' | 'away' | 'busy' | 'offline'
  label?: boolean
  className?: string
}

function Presence({ status, label = false, className }: PresenceProps) {
  const statusConfig = {
    online: {
      color: 'bg-success shadow-[0_0_8px_oklch(0.72_0.19_145_/_0.6)]',
      text: 'Online',
    },
    away: {
      color: 'bg-warning',
      text: 'Away',
    },
    busy: {
      color: 'bg-destructive',
      text: 'Do not disturb',
    },
    offline: {
      color: 'bg-muted-foreground',
      text: 'Offline',
    },
  }

  const config = statusConfig[status]

  return (
    <div className={cn('flex items-center gap-1.5', className)}>
      <span className={cn('size-2 rounded-full', config.color)} />
      {label && (
        <span className="text-xs text-muted-foreground">{config.text}</span>
      )}
    </div>
  )
}

export { Chat, Message, TypingIndicator, Presence }