import { Plus, Wrench } from 'lucide-react'
import { FC, useState } from 'react'
import { useNavigate } from 'react-router-dom'
import { ElementConstructor } from '../../../../components/TemplateManager/ElementConstructor'
import { Button } from '../../../../components/ui/button'
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '../../../../components/ui/card'
import { useTemplateContext } from '../../../../contexts/TemplateContext'
import {
  FormLayoutSettings,
  Template,
  TemplateElement,
} from '../../../../types/template'

export const ElementsCreation: FC = () => {
  const navigate = useNavigate()
  const { templates, updateTemplate } = useTemplateContext()
  const [selectedTemplate, setSelectedTemplate] = useState<Template | null>(
    null,
  )

  const handleTemplateSelect = (template: Template) => {
    setSelectedTemplate(template)
  }

  const handleElementAdd = (element: TemplateElement) => {
    console.log('handleElementAdd called with element:', element)

    if (!selectedTemplate) {
      console.log('No selected template')
      return
    }

    const updatedTemplate = {
      ...selectedTemplate,
      elements: [...selectedTemplate.elements, element],
      updatedAt: new Date(),
    }

    console.log('Updated template:', updatedTemplate)
    console.log('Elements count:', updatedTemplate.elements.length)

    updateTemplate(updatedTemplate)
    setSelectedTemplate(updatedTemplate)
  }

  const handleElementUpdate = (
    elementId: string,
    updates: Partial<TemplateElement>,
  ) => {
    if (!selectedTemplate) return

    const updatedTemplate = {
      ...selectedTemplate,
      elements: selectedTemplate.elements.map((el) =>
        el.id === elementId ? { ...el, ...updates } : el,
      ),
      updatedAt: new Date(),
    }

    updateTemplate(updatedTemplate)
    setSelectedTemplate(updatedTemplate)
  }

  const handleElementDelete = (elementId: string) => {
    if (!selectedTemplate) return

    const updatedTemplate = {
      ...selectedTemplate,
      elements: selectedTemplate.elements.filter((el) => el.id !== elementId),
      updatedAt: new Date(),
    }

    updateTemplate(updatedTemplate)
    setSelectedTemplate(updatedTemplate)
  }

  const handleElementsReorder = (reorderedElements: TemplateElement[]) => {
    if (!selectedTemplate) return

    // Обновляем порядок элементов
    const elementsWithOrder = reorderedElements.map((element, index) => ({
      ...element,
      order: index,
    }))

    const updatedTemplate = {
      ...selectedTemplate,
      elements: elementsWithOrder,
      updatedAt: new Date(),
    }

    updateTemplate(updatedTemplate)
    setSelectedTemplate(updatedTemplate)
  }

  const handleLayoutSettingsChange = (settings: FormLayoutSettings) => {
    if (!selectedTemplate) return

    const updatedTemplate = {
      ...selectedTemplate,
      layoutSettings: settings,
      updatedAt: new Date(),
    }

    updateTemplate(updatedTemplate)
    setSelectedTemplate(updatedTemplate)
  }

  const handleBack = () => {
    setSelectedTemplate(null)
  }

  // Настройки отображения по умолчанию
  const defaultLayoutSettings: FormLayoutSettings = {
    gridSize: 20,
    showGrid: true,
  }

  if (selectedTemplate) {
    return (
      <div className="h-full">
        <div className="sticky top-0 z-50 border-b border-gray-200 bg-white p-4">
          <div className="flex items-center justify-between">
            <div className="flex items-center gap-4">
              <Button variant="ghost" onClick={handleBack}>
                ← Назад
              </Button>
              <div>
                <h1 className="text-xl font-semibold text-gray-800">
                  Конструктор элементов: {selectedTemplate.name}
                </h1>
                <p className="mt-1 text-sm text-gray-600">
                  Создайте элементы формы и разместите их на холсте
                  перетаскиванием
                </p>
              </div>
            </div>
          </div>
        </div>

        <div className="h-[calc(100vh-104px)]">
          <ElementConstructor
            elements={selectedTemplate.elements}
            layoutSettings={
              selectedTemplate.layoutSettings || defaultLayoutSettings
            }
            onElementAdd={handleElementAdd}
            onElementUpdate={handleElementUpdate}
            onElementDelete={handleElementDelete}
            onElementsReorder={handleElementsReorder}
            onLayoutSettingsChange={handleLayoutSettingsChange}
          />
        </div>
      </div>
    )
  }

  return (
    <div className="mx-auto max-w-7xl p-6">
      <div className="mb-6 flex items-center justify-between">
        <div>
          <h1 className="text-3xl font-bold text-gray-900">
            Создание элементов
          </h1>
          <p className="mt-2 text-gray-600">
            Выберите шаблон для создания элементов интерфейса
          </p>
        </div>

        <Button
          variant="outline"
          onClick={() => navigate('/templates')}
          className="flex items-center gap-2"
        >
          <Plus className="h-4 w-4" />
          Создать шаблон
        </Button>
      </div>

      {templates.length === 0 ? (
        <div className="py-12 text-center">
          <Wrench className="mx-auto mb-4 h-16 w-16 text-gray-400" />
          <h3 className="mb-2 text-lg font-medium text-gray-900">
            Нет доступных шаблонов
          </h3>
          <p className="mb-6 text-gray-600">
            Создайте шаблон протокола для начала работы с элементами
          </p>
          <Button onClick={() => navigate('/templates')}>
            <Plus className="mr-2 h-4 w-4" />
            Создать шаблон
          </Button>
        </div>
      ) : (
        <div className="grid grid-cols-1 gap-6 md:grid-cols-2 lg:grid-cols-3">
          {templates.map((template) => (
            <Card
              key={template.id}
              className="cursor-pointer transition-shadow hover:shadow-lg"
            >
              <CardHeader>
                <CardTitle className="text-lg">{template.name}</CardTitle>
                {template.description && (
                  <CardDescription className="mt-1">
                    {template.description}
                  </CardDescription>
                )}
              </CardHeader>
              <CardContent>
                <div className="space-y-2 text-sm text-gray-600">
                  <div className="flex items-center gap-2">
                    <Wrench className="h-4 w-4" />
                    <span>{template.elements.length} элементов создано</span>
                  </div>
                  <div className="mt-2 text-xs text-gray-500">
                    Обновлен: {template.updatedAt.toLocaleDateString('ru-RU')}
                  </div>
                </div>
                <div className="mt-4">
                  <Button
                    className="w-full"
                    onClick={() => handleTemplateSelect(template)}
                  >
                    Создать элементы
                  </Button>
                </div>
              </CardContent>
            </Card>
          ))}
        </div>
      )}
    </div>
  )
}