import React, { useState, useEffect } from 'react'
import { useAuth } from './auth/AuthContext'
import LoadingError from './LoadingError'
import './Wishlist.css'

const API_URL = '/api/wishlist'

function Wishlist({ onNavigate, refreshTrigger = 0 }) {
  const { authFetch } = useAuth()
  const [items, setItems] = useState([])
  const [completed, setCompleted] = useState([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState('')
  const [completedExpanded, setCompletedExpanded] = useState(false)
  const [completedLoading, setCompletedLoading] = useState(false)
  const [selectedItem, setSelectedItem] = useState(null)

  useEffect(() => {
    fetchWishlist()
  }, [])

  // Обновляем данные при изменении refreshTrigger
  useEffect(() => {
    if (refreshTrigger > 0) {
      fetchWishlist()
      // Если завершённые развёрнуты, обновляем и их
      if (completedExpanded) {
        fetchWishlist(true)
      }
    }
  }, [refreshTrigger])

  const fetchWishlist = async (includeCompleted = false) => {
    try {
      if (includeCompleted) {
        setCompletedLoading(true)
      } else {
        setLoading(true)
      }
      
      const url = includeCompleted ? `${API_URL}?include_completed=true` : API_URL
      const response = await authFetch(url)
      
      if (!response.ok) {
        throw new Error('Ошибка при загрузке желаний')
      }
      
      const data = await response.json()
      // Объединяем разблокированные и заблокированные в один список
      const allItems = [...(data.unlocked || []), ...(data.locked || [])]
      setItems(allItems)
      if (includeCompleted) {
        setCompleted(data.completed || [])
      }
      setError('')
    } catch (err) {
      setError(err.message)
      setItems([])
      if (includeCompleted) {
        setCompleted([])
      }
    } finally {
      setLoading(false)
      setCompletedLoading(false)
    }
  }

  const handleToggleCompleted = () => {
    const newExpanded = !completedExpanded
    setCompletedExpanded(newExpanded)
    if (newExpanded && completed.length === 0) {
      fetchWishlist(true)
    }
  }

  const handleAddClick = () => {
    onNavigate?.('wishlist-form', { wishlistId: undefined })
  }

  const handleItemClick = (item) => {
    onNavigate?.('wishlist-detail', { wishlistId: item.id })
  }

  const handleMenuClick = (item, e) => {
    e.stopPropagation()
    setSelectedItem(item)
  }

  const handleEdit = () => {
    if (selectedItem) {
      onNavigate?.('wishlist-form', { wishlistId: selectedItem.id })
      setSelectedItem(null)
    }
  }

  const handleDelete = async () => {
    if (!selectedItem) return

    try {
      const response = await authFetch(`${API_URL}/${selectedItem.id}`, {
        method: 'DELETE',
      })

      if (!response.ok) {
        throw new Error('Ошибка при удалении')
      }

      setSelectedItem(null)
      await fetchWishlist(completedExpanded)
    } catch (err) {
      setError(err.message)
      setSelectedItem(null)
    }
  }

  const handleComplete = async () => {
    if (!selectedItem) return

    try {
      const response = await authFetch(`${API_URL}/${selectedItem.id}/complete`, {
        method: 'POST',
      })

      if (!response.ok) {
        throw new Error('Ошибка при завершении')
      }

      setSelectedItem(null)
      await fetchWishlist(completedExpanded)
    } catch (err) {
      setError(err.message)
      setSelectedItem(null)
    }
  }

  const formatPrice = (price) => {
    return new Intl.NumberFormat('ru-RU', {
      style: 'currency',
      currency: 'RUB',
      minimumFractionDigits: 0,
      maximumFractionDigits: 0,
    }).format(price)
  }

  const renderUnlockCondition = (item) => {
    if (item.unlocked || item.completed) return null
    if (!item.first_locked_condition) return null

    const condition = item.first_locked_condition
    const moreCount = item.more_locked_conditions || 0

    let conditionText = ''
    if (condition.type === 'task_completion') {
      conditionText = condition.task_name || 'Задача'
    } else {
      const points = condition.required_points || 0
      const project = condition.project_name || 'Проект'
      let period = ''
      if (condition.period_type) {
        const periodLabels = {
          week: 'за неделю',
          month: 'за месяц',
          year: 'за год',
        }
        period = ' ' + periodLabels[condition.period_type] || ''
      }
      conditionText = `${points} в ${project}${period}`
    }

    return (
      <div className="unlock-condition-wrapper">
        <div className="unlock-condition-line">
          <div className="unlock-condition">
            <svg className="lock-icon" width="12" height="12" viewBox="0 0 24 24" fill="currentColor">
              <path d="M18 8h-1V6c0-2.76-2.24-5-5-5S7 3.24 7 6v2H6c-1.1 0-2 .9-2 2v10c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V10c0-1.1-.9-2-2-2zM9 6c0-1.66 1.34-3 3-3s3 1.34 3 3v2H9V6zm9 14H6V10h12v10zm-6-3c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2z"/>
            </svg>
            <span className="condition-text">{conditionText}</span>
          </div>
          {item.price && (
            <div className="card-price">{formatPrice(item.price)}</div>
          )}
        </div>
      </div>
    )
  }

  const renderItem = (item) => {
    const isFaded = (!item.unlocked && !item.completed) || item.completed

    return (
      <div
        key={item.id}
        className={`wishlist-card ${isFaded ? 'faded' : ''}`}
        onClick={() => handleItemClick(item)}
      >
        <button
          className="card-menu-button"
          onClick={(e) => handleMenuClick(item, e)}
          title="Меню"
        >
          ⋮
        </button>

        <div className="card-image">
          {item.image_url ? (
            <img src={item.image_url} alt={item.name} />
          ) : (
            <div className="placeholder">
              <svg width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
                <rect x="3" y="3" width="18" height="18" rx="2" ry="2"/>
                <circle cx="8.5" cy="8.5" r="1.5"/>
                <polyline points="21 15 16 10 5 21"/>
              </svg>
            </div>
          )}
        </div>

        <div className="card-name">{item.name}</div>

        {isFaded && !item.completed ? (
          renderUnlockCondition(item)
        ) : (
          item.price && <div className="card-price">{formatPrice(item.price)}</div>
        )}
      </div>
    )
  }

  if (loading) {
    return (
      <div className="wishlist">
        <div className="fixed inset-0 bottom-20 flex justify-center items-center">
          <div className="flex flex-col items-center">
            <div className="w-12 h-12 border-4 border-indigo-200 border-t-indigo-600 rounded-full animate-spin mb-4"></div>
            <div className="text-gray-600 font-medium">Загрузка...</div>
          </div>
        </div>
      </div>
    )
  }

  if (error) {
    return (
      <div className="wishlist">
        <LoadingError onRetry={() => fetchWishlist()} />
      </div>
    )
  }

  return (
    <div className="wishlist">
      {/* Кнопка добавления */}
      <button onClick={handleAddClick} className="add-wishlist-button">
        Добавить
      </button>

      {/* Основной список (разблокированные и заблокированные вместе) */}
      {items.length > 0 && (
        <div className="wishlist-grid">
          {items.map(renderItem)}
        </div>
      )}

      {/* Завершённые */}
      <div className="section-divider">
        <button
          className="completed-toggle"
          onClick={handleToggleCompleted}
        >
          <span className="completed-toggle-icon">
            {completedExpanded ? '▼' : '▶'}
          </span>
          <span>Завершённые</span>
        </button>
      </div>
      {completedExpanded && (
        <>
          {completedLoading ? (
            <div className="loading-completed">
              <div className="w-8 h-8 border-4 border-indigo-200 border-t-indigo-600 rounded-full animate-spin"></div>
            </div>
          ) : (
            <div className="wishlist-grid">
              {completed.map(renderItem)}
            </div>
          )}
        </>
      )}

      {/* Модальное окно для действий */}
      {selectedItem && (
        <div className="wishlist-modal-overlay" onClick={() => setSelectedItem(null)}>
          <div className="wishlist-modal" onClick={(e) => e.stopPropagation()}>
            <div className="wishlist-modal-header">
              <h3>{selectedItem.name}</h3>
            </div>
            <div className="wishlist-modal-actions">
              <button className="wishlist-modal-edit" onClick={handleEdit}>
                Редактировать
              </button>
              {!selectedItem.completed && selectedItem.unlocked && (
                <button className="wishlist-modal-complete" onClick={handleComplete}>
                  Завершить
                </button>
              )}
              <button className="wishlist-modal-delete" onClick={handleDelete}>
                Удалить
              </button>
            </div>
          </div>
        </div>
      )}
    </div>
  )
}

export default Wishlist