'use client';

import { useState, FormEvent } from 'react';
import { useRouter } from 'next/navigation';
import Input from '../ui/Input';
import Button from '../ui/Button';
import { useCreateLeague } from '@/hooks/league/useCreateLeague';
import { useAuth } from '@/lib/auth/AuthContext';
import { useInject } from '@/lib/di/hooks/useInject';
import { DRIVER_SERVICE_TOKEN } from '@/lib/di/tokens';

interface FormErrors {
  name?: string;
  description?: string;
  pointsSystem?: string;
  sessionDuration?: string;
  submit?: string;
}

export default function CreateLeagueForm() {
  const router = useRouter();
  const [errors, setErrors] = useState<FormErrors>({});
  
  const [formData, setFormData] = useState({
    name: '',
    description: '',
    pointsSystem: 'f1-2024' as 'f1-2024' | 'indycar',
    sessionDuration: 60
  });

  const validateForm = (): boolean => {
    const newErrors: FormErrors = {};
    
    if (!formData.name.trim()) {
      newErrors.name = 'Name is required';
    } else if (formData.name.length > 100) {
      newErrors.name = 'Name must be 100 characters or less';
    }
    
    if (!formData.description.trim()) {
      newErrors.description = 'Description is required';
    } else if (formData.description.length > 500) {
      newErrors.description = 'Description must be 500 characters or less';
    }
    
    if (formData.sessionDuration < 1 || formData.sessionDuration > 240) {
      newErrors.sessionDuration = 'Session duration must be between 1 and 240 minutes';
    }
    
    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  const { session } = useAuth();
  const driverService = useInject(DRIVER_SERVICE_TOKEN);
  const createLeagueMutation = useCreateLeague();

  const handleSubmit = async (e: FormEvent) => {
    e.preventDefault();
    
    if (createLeagueMutation.isPending) return;
    
    if (!validateForm()) return;
    
    if (!session?.user.userId) {
      setErrors({ submit: 'You must be logged in to create a league' });
      return;
    }
    
    try {
      // Get current driver
      const currentDriver = await driverService.getDriverProfile(session.user.userId);
      
      if (!currentDriver) {
        setErrors({ submit: 'No driver profile found. Please create a profile first.' });
        return;
      }
      
      // Create league using the league service
      const input = {
        name: formData.name.trim(),
        description: formData.description.trim(),
        visibility: 'public' as const,
        ownerId: session.user.userId,
      };
      
      const result = await createLeagueMutation.mutateAsync(input);
      router.push(`/leagues/${result.leagueId}`);
      router.refresh();
    } catch (error) {
      setErrors({
        submit: error instanceof Error ? error.message : 'Failed to create league'
      });
    }
  };

  return (
    <>
      <form onSubmit={handleSubmit} className="space-y-6">
        <div>
        <label htmlFor="name" className="block text-sm font-medium text-gray-300 mb-2">
          League Name *
        </label>
        <Input
          id="name"
          type="text"
          value={formData.name}
          onChange={(e) => setFormData({ ...formData, name: e.target.value })}
          error={!!errors.name}
          errorMessage={errors.name}
          placeholder="European GT Championship"
          maxLength={100}
          disabled={createLeagueMutation.isPending}
        />
        <p className="mt-1 text-xs text-gray-500 text-right">
          {formData.name.length}/100
        </p>
      </div>

      <div>
        <label htmlFor="description" className="block text-sm font-medium text-gray-300 mb-2">
          Description *
        </label>
        <textarea
          id="description"
          value={formData.description}
          onChange={(e) => setFormData({ ...formData, description: e.target.value })}
          placeholder="Weekly GT3 racing with professional drivers"
          maxLength={500}
          rows={4}
          disabled={createLeagueMutation.isPending}
          className="block w-full rounded-md border-0 px-4 py-3 bg-iron-gray text-white shadow-sm ring-1 ring-inset ring-charcoal-outline placeholder:text-gray-500 focus:ring-2 focus:ring-inset focus:ring-primary-blue transition-all duration-150 sm:text-sm sm:leading-6 resize-none"
        />
        <p className="mt-1 text-xs text-gray-500 text-right">
          {formData.description.length}/500
        </p>
        {errors.description && (
          <p className="mt-2 text-sm text-warning-amber">{errors.description}</p>
        )}
      </div>

      <div>
        <label htmlFor="pointsSystem" className="block text-sm font-medium text-gray-300 mb-2">
          Points System *
        </label>
        <select
          id="pointsSystem"
          value={formData.pointsSystem}
          onChange={(e) => setFormData({ ...formData, pointsSystem: e.target.value as 'f1-2024' | 'indycar' })}
          disabled={createLeagueMutation.isPending}
          className="block w-full rounded-md border-0 px-4 py-3 bg-iron-gray text-white shadow-sm ring-1 ring-inset ring-charcoal-outline focus:ring-2 focus:ring-inset focus:ring-primary-blue transition-all duration-150 sm:text-sm sm:leading-6"
        >
          <option value="f1-2024">F1 2024</option>
          <option value="indycar">IndyCar</option>
        </select>
      </div>

      <div>
        <label htmlFor="sessionDuration" className="block text-sm font-medium text-gray-300 mb-2">
          Session Duration (minutes) *
        </label>
        <Input
          id="sessionDuration"
          type="number"
          value={formData.sessionDuration}
          onChange={(e) => setFormData({ ...formData, sessionDuration: parseInt(e.target.value) || 60 })}
          error={!!errors.sessionDuration}
          errorMessage={errors.sessionDuration}
          min={1}
          max={240}
          disabled={createLeagueMutation.isPending}
        />
      </div>

      {errors.submit && (
        <div className="rounded-md bg-warning-amber/10 p-4 border border-warning-amber/20">
          <p className="text-sm text-warning-amber">{errors.submit}</p>
        </div>
      )}

      <Button
        type="submit"
        variant="primary"
        disabled={createLeagueMutation.isPending}
        className="w-full"
      >
        {createLeagueMutation.isPending ? 'Creating League...' : 'Create League'}
        </Button>
      </form>
    </>
  );
}