'use client';

import { useState } from 'react';
import { Modal } from '@/components/ui/Modal';
import { Button } from '@/components/ui/Button';
import { Input } from '@/components/ui/Input';
import { Badge } from '@/components/ui/Badge';
import { TaskPriority, TaskStatus } from '@/lib/types';
import { CreateTaskData } from '@/clients/tasks-client';

interface CreateTaskFormProps {
  isOpen: boolean;
  onClose: () => void;
  onSubmit: (data: CreateTaskData) => Promise<void>;
  loading?: boolean;
}

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

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

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

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

    if (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()) return;

    try {
      await onSubmit(formData);
      handleClose();
    } catch (error) {
      console.error('Erreur lors de la création:', error);
    }
  };

  const handleClose = () => {
    setFormData({
      title: '',
      description: '',
      status: 'todo',
      priority: 'medium',
      tags: [],
      dueDate: undefined
    });
    setTagInput('');
    setErrors({});
    onClose();
  };

  const addTag = () => {
    const tag = tagInput.trim();
    if (tag && !formData.tags?.includes(tag)) {
      setFormData((prev: CreateTaskData) => ({
        ...prev,
        tags: [...(prev.tags || []), tag]
      }));
      setTagInput('');
    }
  };

  const removeTag = (tagToRemove: string) => {
    setFormData((prev: CreateTaskData) => ({
      ...prev,
      tags: prev.tags?.filter((tag: string) => tag !== tagToRemove) || []
    }));
  };

  const handleTagKeyPress = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter') {
      e.preventDefault();
      addTag();
    }
  };

  return (
    <Modal isOpen={isOpen} onClose={handleClose} title="Nouvelle tâche" size="lg">
      <form onSubmit={handleSubmit} className="space-y-6">
        {/* Titre */}
        <Input
          label="Titre *"
          value={formData.title}
          onChange={(e) => setFormData((prev: CreateTaskData) => ({ ...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: CreateTaskData) => ({ ...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: CreateTaskData) => ({ ...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: CreateTaskData) => ({ ...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"
            >
              <option value="todo">À faire</option>
              <option value="in_progress">En cours</option>
              <option value="done">Terminé</option>
              <option value="cancelled">Annulé</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: CreateTaskData) => ({ 
            ...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>
          
          <div className="flex gap-2">
            <Input
              value={tagInput}
              onChange={(e) => setTagInput(e.target.value)}
              onKeyPress={handleTagKeyPress}
              placeholder="Ajouter un tag..."
              disabled={loading}
              className="flex-1"
            />
            <Button
              type="button"
              variant="secondary"
              onClick={addTag}
              disabled={!tagInput.trim() || loading}
            >
              Ajouter
            </Button>
          </div>

          {formData.tags && formData.tags.length > 0 && (
            <div className="flex flex-wrap gap-2">
              {formData.tags.map((tag: string, index: number) => (
                <Badge
                  key={index}
                  variant="primary"
                  className="cursor-pointer hover:bg-red-950/50 hover:text-red-300 hover:border-red-500/30 transition-colors"
                  onClick={() => removeTag(tag)}
                >
                  {tag} ✕
                </Badge>
              ))}
            </div>
          )}
        </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 ? 'Création...' : 'Créer la tâche'}
          </Button>
        </div>
      </form>
    </Modal>
  );
}
