import React, { useState } from 'react';
import { useTranslation } from 'react-i18next';
import { Plus, X, Clock, Flame, ChefHat } from 'lucide-react';
import Button from '../../../ui/Button/Button';
import Card from '../../../ui/Card/Card';
import Input from '../../../ui/Input/Input';
import Select from '../../../ui/Select/Select';

export interface ProductionProcess {
  id: string;
  name: string;
  sourceProduct: string;
  finishedProduct: string;
  processType: 'baking' | 'decorating' | 'finishing' | 'assembly';
  duration: number; // minutes
  temperature?: number; // celsius
  instructions?: string;
}

export interface ProductionProcessesStepProps {
  onUpdate?: (data: { processes: ProductionProcess[] }) => void;
  onComplete?: () => void;
  initialData?: {
    processes?: ProductionProcess[];
  };
}

const PROCESS_TEMPLATES: Partial<ProductionProcess>[] = [
  {
    name: 'Horneado de Pan Pre-cocido',
    processType: 'baking',
    duration: 15,
    temperature: 200,
    instructions: 'Hornear a 200°C durante 15 minutos hasta dorar',
  },
  {
    name: 'Terminado de Croissant Congelado',
    processType: 'baking',
    duration: 20,
    temperature: 180,
    instructions: 'Descongelar 2h, hornear a 180°C por 20 min',
  },
  {
    name: 'Decoración de Pastel',
    processType: 'decorating',
    duration: 30,
    instructions: 'Aplicar crema, decorar y refrigerar',
  },
  {
    name: 'Montaje de Sándwich',
    processType: 'assembly',
    duration: 5,
    instructions: 'Ensamblar ingredientes según especificación',
  },
];

export const ProductionProcessesStep: React.FC<ProductionProcessesStepProps> = ({
  onUpdate,
  onComplete,
  initialData,
}) => {
  const { t } = useTranslation();
  const [processes, setProcesses] = useState<ProductionProcess[]>(
    initialData?.processes || []
  );
  const [isAddingNew, setIsAddingNew] = useState(false);
  const [showTemplates, setShowTemplates] = useState(true);
  const [newProcess, setNewProcess] = useState<Partial<ProductionProcess>>({
    name: '',
    sourceProduct: '',
    finishedProduct: '',
    processType: 'baking',
    duration: 15,
    temperature: 180,
    instructions: '',
  });

  const processTypeOptions = [
    { value: 'baking', label: t('onboarding:processes.type.baking', 'Horneado') },
    { value: 'decorating', label: t('onboarding:processes.type.decorating', 'Decoración') },
    { value: 'finishing', label: t('onboarding:processes.type.finishing', 'Terminado') },
    { value: 'assembly', label: t('onboarding:processes.type.assembly', 'Montaje') },
  ];

  const handleAddFromTemplate = (template: Partial<ProductionProcess>) => {
    const newProc: ProductionProcess = {
      id: `process-${Date.now()}`,
      name: template.name || '',
      sourceProduct: '',
      finishedProduct: '',
      processType: template.processType || 'baking',
      duration: template.duration || 15,
      temperature: template.temperature,
      instructions: template.instructions || '',
    };
    const updated = [...processes, newProc];
    setProcesses(updated);
    onUpdate?.({ processes: updated });
    setShowTemplates(false);
  };

  const handleAddNew = () => {
    if (!newProcess.name || !newProcess.sourceProduct || !newProcess.finishedProduct) {
      return;
    }

    const process: ProductionProcess = {
      id: `process-${Date.now()}`,
      name: newProcess.name,
      sourceProduct: newProcess.sourceProduct,
      finishedProduct: newProcess.finishedProduct,
      processType: newProcess.processType || 'baking',
      duration: newProcess.duration || 15,
      temperature: newProcess.temperature,
      instructions: newProcess.instructions || '',
    };

    const updated = [...processes, process];
    setProcesses(updated);
    onUpdate?.({ processes: updated });

    // Reset form
    setNewProcess({
      name: '',
      sourceProduct: '',
      finishedProduct: '',
      processType: 'baking',
      duration: 15,
      temperature: 180,
      instructions: '',
    });
    setIsAddingNew(false);
  };

  const handleRemove = (id: string) => {
    const updated = processes.filter(p => p.id !== id);
    setProcesses(updated);
    onUpdate?.({ processes: updated });
  };

  const handleContinue = () => {
    onComplete?.();
  };

  const getProcessIcon = (type: string) => {
    switch (type) {
      case 'baking':
        return <Flame className="w-5 h-5 text-orange-500" />;
      case 'decorating':
        return <ChefHat className="w-5 h-5 text-pink-500" />;
      case 'finishing':
      case 'assembly':
        return <Clock className="w-5 h-5 text-blue-500" />;
      default:
        return <Clock className="w-5 h-5 text-gray-500" />;
    }
  };

  return (
    <div className="max-w-4xl mx-auto p-4 md:p-6 space-y-4 md:space-y-6">
      {/* Header */}
      <div className="text-center space-y-2">
        <h1 className="text-xl md:text-2xl font-bold text-text-primary px-2">
          {t('onboarding:processes.title', 'Procesos de Producción')}
        </h1>
        <p className="text-sm md:text-base text-text-secondary px-4">
          {t(
            'onboarding:processes.subtitle',
            'Define los procesos que usas para transformar productos pre-elaborados en productos terminados'
          )}
        </p>
      </div>

      {/* Templates Section */}
      {showTemplates && processes.length === 0 && (
        <Card className="p-6 space-y-4 bg-gradient-to-br from-blue-50 to-cyan-50">
          <div className="flex items-center justify-between">
            <div className="space-y-1">
              <h3 className="font-semibold text-text-primary">
                {t('onboarding:processes.templates.title', '⚡ Comienza rápido con plantillas')}
              </h3>
              <p className="text-sm text-text-secondary">
                {t('onboarding:processes.templates.subtitle', 'Haz clic en una plantilla para agregarla')}
              </p>
            </div>
            <Button
              variant="ghost"
              size="sm"
              onClick={() => setShowTemplates(false)}
            >
              {t('onboarding:processes.templates.hide', 'Ocultar')}
            </Button>
          </div>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
            {PROCESS_TEMPLATES.map((template, index) => (
              <button
                key={index}
                onClick={() => handleAddFromTemplate(template)}
                className="p-4 text-left bg-white border border-border-primary rounded-lg hover:shadow-md hover:border-primary-300 transition-all"
              >
                <div className="space-y-2">
                  <div className="flex items-center gap-2">
                    {getProcessIcon(template.processType || 'baking')}
                    <span className="font-medium text-text-primary">{template.name}</span>
                  </div>
                  <div className="flex items-center gap-3 text-xs text-text-secondary">
                    <span>⏱️ {template.duration} min</span>
                    {template.temperature && <span>🌡️ {template.temperature}°C</span>}
                  </div>
                </div>
              </button>
            ))}
          </div>
        </Card>
      )}

      {/* Existing Processes */}
      {processes.length > 0 && (
        <div className="space-y-3">
          <h3 className="font-semibold text-text-primary">
            {t('onboarding:processes.your_processes', 'Tus Procesos')} ({processes.length})
          </h3>
          <div className="space-y-2">
            {processes.map((process) => (
              <Card key={process.id} className="p-4">
                <div className="flex items-start justify-between gap-4">
                  <div className="flex-1 space-y-2">
                    <div className="flex items-center gap-2">
                      {getProcessIcon(process.processType)}
                      <h4 className="font-semibold text-text-primary">{process.name}</h4>
                    </div>
                    <div className="text-sm text-text-secondary space-y-1">
                      {process.sourceProduct && (
                        <p>
                          <span className="font-medium">
                            {t('onboarding:processes.source', 'Desde')}:
                          </span>{' '}
                          {process.sourceProduct}
                        </p>
                      )}
                      {process.finishedProduct && (
                        <p>
                          <span className="font-medium">
                            {t('onboarding:processes.finished', 'Hasta')}:
                          </span>{' '}
                          {process.finishedProduct}
                        </p>
                      )}
                      <div className="flex items-center gap-3 pt-1">
                        <span>⏱️ {process.duration} min</span>
                        {process.temperature && <span>🌡️ {process.temperature}°C</span>}
                      </div>
                      {process.instructions && (
                        <p className="text-xs italic pt-1">{process.instructions}</p>
                      )}
                    </div>
                  </div>
                  <button
                    onClick={() => handleRemove(process.id)}
                    className="text-text-secondary hover:text-red-600 transition-colors"
                  >
                    <X className="w-5 h-5" />
                  </button>
                </div>
              </Card>
            ))}
          </div>
        </div>
      )}

      {/* Add New Process Form */}
      {isAddingNew && (
        <Card className="p-6 space-y-4 border-2 border-primary-300">
          <div className="flex items-center justify-between">
            <h3 className="font-semibold text-text-primary">
              {t('onboarding:processes.add_new', 'Nuevo Proceso')}
            </h3>
            <button
              onClick={() => setIsAddingNew(false)}
              className="text-text-secondary hover:text-text-primary"
            >
              <X className="w-5 h-5" />
            </button>
          </div>

          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="md:col-span-2">
              <Input
                label={t('onboarding:processes.form.name', 'Nombre del Proceso')}
                value={newProcess.name || ''}
                onChange={(e) => setNewProcess({ ...newProcess, name: e.target.value })}
                placeholder={t('onboarding:processes.form.name_placeholder', 'Ej: Horneado de pan')}
                required
              />
            </div>

            <Input
              label={t('onboarding:processes.form.source', 'Producto Origen')}
              value={newProcess.sourceProduct || ''}
              onChange={(e) => setNewProcess({ ...newProcess, sourceProduct: e.target.value })}
              placeholder={t('onboarding:processes.form.source_placeholder', 'Ej: Pan pre-cocido')}
              required
            />

            <Input
              label={t('onboarding:processes.form.finished', 'Producto Terminado')}
              value={newProcess.finishedProduct || ''}
              onChange={(e) => setNewProcess({ ...newProcess, finishedProduct: e.target.value })}
              placeholder={t('onboarding:processes.form.finished_placeholder', 'Ej: Pan fresco')}
              required
            />

            <Select
              label={t('onboarding:processes.form.type', 'Tipo de Proceso')}
              value={newProcess.processType || 'baking'}
              onChange={(e) => setNewProcess({ ...newProcess, processType: e.target.value as any })}
              options={processTypeOptions}
            />

            <Input
              type="number"
              label={t('onboarding:processes.form.duration', 'Duración (minutos)')}
              value={newProcess.duration || 15}
              onChange={(e) => setNewProcess({ ...newProcess, duration: parseInt(e.target.value) })}
              min={1}
            />

            {(newProcess.processType === 'baking' || newProcess.processType === 'finishing') && (
              <Input
                type="number"
                label={t('onboarding:processes.form.temperature', 'Temperatura (°C)')}
                value={newProcess.temperature || ''}
                onChange={(e) => setNewProcess({ ...newProcess, temperature: parseInt(e.target.value) || undefined })}
                placeholder="180"
              />
            )}

            <div className="md:col-span-2">
              <label className="block text-sm font-medium text-text-primary mb-1">
                {t('onboarding:processes.form.instructions', 'Instrucciones (opcional)')}
              </label>
              <textarea
                value={newProcess.instructions || ''}
                onChange={(e) => setNewProcess({ ...newProcess, instructions: e.target.value })}
                placeholder={t('onboarding:processes.form.instructions_placeholder', 'Describe el proceso...')}
                rows={3}
                className="w-full px-3 py-2 border border-border-primary rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-transparent"
              />
            </div>
          </div>

          <div className="flex gap-2 justify-end">
            <Button variant="outline" onClick={() => setIsAddingNew(false)}>
              {t('onboarding:processes.form.cancel', 'Cancelar')}
            </Button>
            <Button
              onClick={handleAddNew}
              disabled={!newProcess.name || !newProcess.sourceProduct || !newProcess.finishedProduct}
            >
              {t('onboarding:processes.form.add', 'Agregar Proceso')}
            </Button>
          </div>
        </Card>
      )}

      {/* Add Button */}
      {!isAddingNew && (
        <Button
          onClick={() => setIsAddingNew(true)}
          variant="outline"
          className="w-full border-dashed"
        >
          <Plus className="w-5 h-5 mr-2" />
          {t('onboarding:processes.add_button', 'Agregar Proceso')}
        </Button>
      )}

      {/* Footer Actions */}
      <div className="flex items-center justify-between pt-6 border-t border-border-primary">
        <p className="text-sm text-text-secondary">
          {processes.length === 0
            ? t('onboarding:processes.hint', '💡 Agrega al menos un proceso para continuar')
            : t('onboarding:processes.count', `${processes.length} proceso(s) configurado(s)`)}
        </p>
        <div className="flex gap-3">
          <Button variant="outline" onClick={handleContinue}>
            {t('onboarding:processes.skip', 'Omitir por ahora')}
          </Button>
          <Button onClick={handleContinue} disabled={processes.length === 0}>
            {t('onboarding:processes.continue', 'Continuar')}
          </Button>
        </div>
      </div>
    </div>
  );
};

export default ProductionProcessesStep;
