'use client';

import React, { useCallback } from 'react';
import { cn } from '@/lib/utils';
import { useChatContext } from './ChatProvider';
import { MessageList } from './MessageList';
import { ChatComposer } from './ChatComposer';
import { Sparkles, AlertCircle, X } from 'lucide-react';

// =============================================================================
// Types
// =============================================================================

interface ChatInterfaceProps {
  className?: string;
}

// =============================================================================
// Status Indicator Component
// =============================================================================

interface StatusIndicatorProps {
  status: 'idle' | 'loading' | 'streaming' | 'error';
}

function StatusIndicator({ status }: StatusIndicatorProps) {
  const statusConfig = {
    idle: {
      color: 'bg-emerald-400',
      pulse: false,
      label: 'Ready',
    },
    loading: {
      color: 'bg-amber-400',
      pulse: true,
      label: 'Loading',
    },
    streaming: {
      color: 'bg-indigo-400',
      pulse: true,
      label: 'Responding',
    },
    error: {
      color: 'bg-red-400',
      pulse: false,
      label: 'Error',
    },
  };

  const config = statusConfig[status];

  return (
    <div className="flex items-center gap-2">
      <span
        className={cn(
          'w-2.5 h-2.5 rounded-full',
          config.color,
          config.pulse && 'animate-pulse'
        )}
      />
      <span className="text-xs text-gray-500 font-medium">{config.label}</span>
    </div>
  );
}

// =============================================================================
// Error Banner Component
// =============================================================================

interface ErrorBannerProps {
  message: string;
  onDismiss: () => void;
}

function ErrorBanner({ message, onDismiss }: ErrorBannerProps) {
  return (
    <div
      className={cn(
        'flex items-center gap-3 px-4 py-3 mx-4 mt-4 rounded-xl',
        'bg-red-50 border border-red-200',
        'shadow-[inset_2px_2px_4px_rgba(0,0,0,0.03),inset_-2px_-2px_4px_rgba(255,255,255,0.5)]'
      )}
    >
      <AlertCircle className="w-5 h-5 text-red-500 flex-shrink-0" />
      <p className="flex-1 text-sm text-red-700">{message}</p>
      <button
        onClick={onDismiss}
        className={cn(
          'p-1 rounded-lg text-red-400 hover:text-red-600',
          'hover:bg-red-100 transition-colors'
        )}
        aria-label="Dismiss error"
      >
        <X className="w-4 h-4" />
      </button>
    </div>
  );
}

// =============================================================================
// Header Component
// =============================================================================

interface HeaderProps {
  status: 'idle' | 'loading' | 'streaming' | 'error';
}

function Header({ status }: HeaderProps) {
  return (
    <header
      className={cn(
        'flex items-center justify-between px-6 py-4',
        'border-b border-gray-200/60',
        'bg-gradient-to-r from-[#F0F4F8] to-[#E8ECF0]',
        'shadow-[inset_0_-2px_4px_rgba(0,0,0,0.02)]'
      )}
    >
      <div className="flex items-center gap-3">
        <div
          className={cn(
            'w-10 h-10 rounded-xl flex items-center justify-center',
            'bg-gradient-to-br from-indigo-500 to-purple-600',
            'shadow-[4px_4px_8px_#bfc3cc,-4px_-4px_8px_#ffffff]'
          )}
        >
          <Sparkles className="w-5 h-5 text-white" />
        </div>
        <div>
          <h1 className="text-lg font-bold text-gray-800">Control Center</h1>
          <p className="text-xs text-gray-500">AI-powered assistant</p>
        </div>
      </div>
      <StatusIndicator status={status} />
    </header>
  );
}


// =============================================================================
// Main Component
// =============================================================================

export function ChatInterface({ className }: ChatInterfaceProps) {
  const {
    isLoading,
    isStreaming,
    error,
    clearError,
    sendMessage,
  } = useChatContext();

  // Determine current status
  const getStatus = (): 'idle' | 'loading' | 'streaming' | 'error' => {
    if (error) return 'error';
    if (isStreaming) return 'streaming';
    if (isLoading) return 'loading';
    return 'idle';
  };

  // Handle message sending from ChatComposer
  const handleSend = useCallback((message: string, provider?: string) => {
    sendMessage(message, provider);
  }, [sendMessage]);

  return (
    <div
      className={cn(
        'flex flex-col h-full w-full',
        'bg-[#F0F4F8]',
        'rounded-3xl overflow-hidden',
        'shadow-[8px_8px_16px_#b8bcc5,-8px_-8px_16px_#ffffff]',
        'border-2 border-white/50',
        className
      )}
    >
      {/* Header */}
      <Header status={getStatus()} />

      {/* Error Banner */}
      {error && (
        <ErrorBanner message={error} onDismiss={clearError} />
      )}

      {/* Message List */}
      <div className="flex-1 min-h-0 overflow-hidden flex flex-col">
        <MessageList />
      </div>

      {/* Chat Composer */}
      <div
        className={cn(
          'px-4 py-4 border-t border-gray-200/60',
          'bg-gradient-to-r from-[#F0F4F8] to-[#E8ECF0]'
        )}
      >
        <ChatComposer
          onSend={handleSend}
          disabled={isLoading}
          isStreaming={isStreaming}
        />
      </div>
    </div>
  );
}

export default ChatInterface;