import { useState, useRef } from 'react';
import { Dialog } from '@/components/ui/dialog';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Button } from '@/components/ui/button';
import { Select } from '@/components/ui/select';
import { apiClient } from '@/services/api/client';
import { useToast } from '@/hooks/useToast';
import { useChatStore } from '../store/chatStore';
import { parseApiError } from '@/utils/apiErrorHandler';
import { ErrorDisplay } from '@/components/ui/ErrorDisplay';

// FE-PAGE-005: Complete Chat page implementation - Room Management

interface CreateRoomDialogProps {
  open: boolean;
  onClose: () => void;
}

export function CreateRoomDialog({ open, onClose }: CreateRoomDialogProps) {
  const [name, setName] = useState('');
  const [type, setType] = useState<'public' | 'private'>('public');
  const [isCreating, setIsCreating] = useState(false);
  const [validationError, setValidationError] = useState<string | null>(null);
  const [mutationError, setMutationError] = useState<Error | null>(null);
  const [retryCount, setRetryCount] = useState(0);
  const lastMutationRef = useRef<(() => Promise<void>) | null>(null);
  const toast = useToast();
  const { addConversation, setCurrentConversation } = useChatStore();

  const handleCreate = async () => {
    setValidationError(null);
    setMutationError(null);
    
    if (!name.trim()) {
      setValidationError('Room name is required');
      return;
    }

    // Action 3.4.1.3: Store mutation for retry
    const roomName = name.trim();
    const roomType = type;
    const performMutation = async () => {
      const response = await apiClient.post('/conversations', {
        name: roomName,
        type: roomType,
      });

      const newRoom = {
        id: response.data.id || response.data.conversation?.id,
        name: response.data.name || response.data.conversation?.name,
        type: response.data.type || response.data.conversation?.type || roomType,
        participants: response.data.participants || [],
        unread_count: 0,
      };

      addConversation(newRoom);
      setCurrentConversation(newRoom.id);
      toast.success('Room created successfully');
      setName('');
      setType('public');
      setMutationError(null);
      setRetryCount(0);
      lastMutationRef.current = null;
      onClose();
    };

    lastMutationRef.current = performMutation;
    setIsCreating(true);

    try {
      await performMutation();
    } catch (error: unknown) {
      const apiError = parseApiError(error);
      setMutationError(new Error(apiError.message));
    } finally {
      setIsCreating(false);
    }
  };

  // Action 3.4.1.3: Retry handler for failed mutations
  const handleRetry = async () => {
    if (!lastMutationRef.current || retryCount >= 3) return;
    
    setRetryCount((prev) => prev + 1);
    setIsCreating(true);
    try {
      await lastMutationRef.current();
    } catch (error) {
      // Error will be handled by the mutation function
    } finally {
      setIsCreating(false);
    }
  };

  return (
    <Dialog
      open={open}
      onClose={onClose}
      title="Create New Room"
      variant="default"
      size="md"
    >
      <div className="space-y-4">
        {mutationError && (
          <ErrorDisplay
            error={mutationError}
            variant="banner"
            severity="error"
            context={{
              action: 'creating room',
              resource: 'conversation',
            }}
            onRetry={retryCount < 3 ? handleRetry : undefined}
            onDismiss={() => {
              setMutationError(null);
              setRetryCount(0);
              lastMutationRef.current = null;
            }}
          />
        )}
        {validationError && (
          <ErrorDisplay
            error={validationError}
            variant="inline"
            severity="error"
            size="sm"
            dismissible={false}
          />
        )}
        <div className="space-y-2">
          <Label htmlFor="room-name">Room Name</Label>
          <Input
            id="room-name"
            value={name}
            onChange={(e) => {
              setName(e.target.value);
              setValidationError(null);
            }}
            placeholder="Enter room name"
            maxLength={100}
          />
        </div>
        <div className="space-y-2">
          <Label htmlFor="room-type">Room Type</Label>
          <Select
            options={[
              { value: 'public', label: 'Public' },
              { value: 'private', label: 'Private' },
            ]}
            value={type}
            onChange={(value) =>
              setType((Array.isArray(value) ? value[0] : value) as 'public' | 'private')
            }
            name="room-type"
          />
        </div>
        <div className="flex justify-end gap-2 pt-4">
          <Button variant="outline" onClick={onClose} disabled={isCreating}>
            Cancel
          </Button>
          <Button onClick={handleCreate} disabled={isCreating || !name.trim()}>
            {isCreating ? 'Creating...' : 'Create Room'}
          </Button>
        </div>
      </div>
    </Dialog>
  );
}