'use client';

import { useState, useEffect } from 'react';
import { Modal } from '@/components/ui/Modal';
import { Button } from '@/components/ui/Button';
import { Input } from '@/components/ui/Input';
import { TagInput } from '@/components/ui/TagInput';
import { Task, TaskPriority, TaskStatus } from '@/lib/types';
import { UpdateTaskData } from '@/clients/tasks-client';
import { getAllStatuses } from '@/lib/status-config';

interface EditTaskFormProps {
  isOpen: boolean;
  onClose: () => void;
  onSubmit: (data: UpdateTaskData) => Promise<void>;
  task: Task | null;
  loading?: boolean;
}

export function EditTaskForm({ isOpen, onClose, onSubmit, task, loading = false }: EditTaskFormProps) {
  const [formData, setFormData] = useState<Omit<UpdateTaskData, 'taskId'>>({
    title: '',
    description: '',
    status: 'todo' as TaskStatus,
    priority: 'medium' as TaskPriority,
    tags: [],
    dueDate: undefined
  });

  const [errors, setErrors] = useState<Record<string, string>>({});

  // Pré-remplir le formulaire quand la tâche change
  useEffect(() => {
    if (task) {
      setFormData({
        title: task.title,
        description: task.description || '',
        status: task.status,
        priority: task.priority,
        tags: task.tags || [],
        dueDate: task.dueDate ? new Date(task.dueDate) : undefined
      });
    }
  }, [task]);

  const validateForm = (): boolean => {
    const newErrors: Record<string, string> = {};

    if (!formData.title?.trim()) {
      newErrors.title = 'Le titre est requis';
    }

    if (formData.title && formData.title.length > 200) {
      newErrors.title = 'Le titre ne peut pas dépasser 200 caractères';
    }

    if (formData.description && formData.description.length > 1000) {
      newErrors.description = 'La description ne peut pas dépasser 1000 caractères';
    }

    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    
    if (!validateForm() || !task) return;

    try {
      await onSubmit({
        taskId: task.id,
        ...formData
      });
      handleClose();
    } catch (error) {
      console.error('Erreur lors de la mise à jour:', error);
    }
  };

  const handleClose = () => {
    setErrors({});
    onClose();
  };


  if (!task) return null;

  return (
    <Modal isOpen={isOpen} onClose={handleClose} title="Modifier la tâche" size="lg">
      <form onSubmit={handleSubmit} className="space-y-6">
        {/* Titre */}
        <Input
          label="Titre *"
          value={formData.title}
          onChange={(e) => setFormData(prev => ({ ...prev, title: e.target.value }))}
          placeholder="Titre de la tâche..."
          error={errors.title}
          disabled={loading}
        />

        {/* Description */}
        <div className="space-y-2">
          <label className="block text-sm font-mono font-medium text-slate-300 uppercase tracking-wider">
            Description
          </label>
          <textarea
            value={formData.description}
            onChange={(e) => setFormData(prev => ({ ...prev, description: e.target.value }))}
            placeholder="Description détaillée..."
            rows={4}
            disabled={loading}
            className="w-full px-3 py-2 bg-slate-800/50 border border-slate-700/50 rounded-lg text-slate-100 font-mono text-sm placeholder-slate-500 focus:outline-none focus:ring-2 focus:ring-cyan-500/50 focus:border-cyan-500/50 hover:border-slate-600/50 transition-all duration-200 backdrop-blur-sm resize-none"
          />
          {errors.description && (
            <p className="text-xs font-mono text-red-400 flex items-center gap-1">
              <span className="text-red-500">⚠</span>
              {errors.description}
            </p>
          )}
        </div>

        {/* Priorité et Statut */}
        <div className="grid grid-cols-2 gap-4">
          <div className="space-y-2">
            <label className="block text-sm font-mono font-medium text-slate-300 uppercase tracking-wider">
              Priorité
            </label>
            <select
              value={formData.priority}
              onChange={(e) => setFormData(prev => ({ ...prev, priority: e.target.value as TaskPriority }))}
              disabled={loading}
              className="w-full px-3 py-2 bg-slate-800/50 border border-slate-700/50 rounded-lg text-slate-100 font-mono text-sm focus:outline-none focus:ring-2 focus:ring-cyan-500/50 focus:border-cyan-500/50 hover:border-slate-600/50 transition-all duration-200 backdrop-blur-sm"
            >
              <option value="low">Faible</option>
              <option value="medium">Moyenne</option>
              <option value="high">Élevée</option>
              <option value="urgent">Urgente</option>
            </select>
          </div>

          <div className="space-y-2">
            <label className="block text-sm font-mono font-medium text-slate-300 uppercase tracking-wider">
              Statut
            </label>
            <select
              value={formData.status}
              onChange={(e) => setFormData(prev => ({ ...prev, status: e.target.value as TaskStatus }))}
              disabled={loading}
              className="w-full px-3 py-2 bg-slate-800/50 border border-slate-700/50 rounded-lg text-slate-100 font-mono text-sm focus:outline-none focus:ring-2 focus:ring-cyan-500/50 focus:border-cyan-500/50 hover:border-slate-600/50 transition-all duration-200 backdrop-blur-sm"
            >
              {getAllStatuses().map(statusConfig => (
                <option key={statusConfig.key} value={statusConfig.key}>
                  {statusConfig.label}
                </option>
              ))}
            </select>
          </div>
        </div>

        {/* Date d'échéance */}
        <Input
          label="Date d'échéance"
          type="datetime-local"
          value={formData.dueDate ? new Date(formData.dueDate.getTime() - formData.dueDate.getTimezoneOffset() * 60000).toISOString().slice(0, 16) : ''}
          onChange={(e) => setFormData(prev => ({ 
            ...prev, 
            dueDate: e.target.value ? new Date(e.target.value) : undefined 
          }))}
          disabled={loading}
        />

        {/* Tags */}
        <div className="space-y-3">
          <label className="block text-sm font-mono font-medium text-slate-300 uppercase tracking-wider">
            Tags
          </label>
          
          <TagInput
            tags={formData.tags || []}
            onChange={(tags) => setFormData(prev => ({ ...prev, tags }))}
            placeholder="Ajouter des tags..."
            maxTags={10}
          />
        </div>

        {/* Actions */}
        <div className="flex justify-end gap-3 pt-4 border-t border-slate-700/50">
          <Button
            type="button"
            variant="ghost"
            onClick={handleClose}
            disabled={loading}
          >
            Annuler
          </Button>
          <Button
            type="submit"
            variant="primary"
            disabled={loading}
          >
            {loading ? 'Mise à jour...' : 'Mettre à jour'}
          </Button>
        </div>
      </form>
    </Modal>
  );
}