import React, { useState, useEffect } from 'react'
import { View, Text } from '@tarojs/components'
import { Cell, CellGroup, Radio } from '@nutui/nutui-react-taro'
import { gradientThemes, GradientTheme, gradientUtils } from '@/styles/gradients'
import Taro from '@tarojs/taro'
import FixedButton from "@/components/FixedButton";

const ThemeSelector: React.FC = () => {
  const [selectedTheme, setSelectedTheme] = useState<string>('')
  const [currentTheme, setCurrentTheme] = useState<GradientTheme | null>(null)

  // 获取当前主题
  useEffect(() => {
    const savedTheme = Taro.getStorageSync('user_theme') || 'auto'
    setSelectedTheme(savedTheme)

    if (savedTheme === 'auto') {
      // 自动主题：根据用户ID生成
      const userId = Taro.getStorageSync('userId') || '1'
      const theme = gradientUtils.getThemeByUserId(userId)
      setCurrentTheme(theme)
    } else {
      // 手动选择的主题
      const theme = gradientThemes.find(t => t.name === savedTheme)
      setCurrentTheme(theme || gradientThemes[0])
    }
  }, [])

  // 保存主题设置
  const saveTheme = (themeName: string) => {
    try {
      Taro.setStorageSync('user_theme', themeName)
      setSelectedTheme(themeName)

      if (themeName === 'auto') {
        const userId = Taro.getStorageSync('userId') || '1'
        const theme = gradientUtils.getThemeByUserId(userId)
        setCurrentTheme(theme)
      } else {
        const theme = gradientThemes.find(t => t.name === themeName)
        setCurrentTheme(theme || gradientThemes[0])
      }

      Taro.showToast({
        title: '主题已保存',
        icon: 'success',
      })

      // 延迟返回，让用户看到效果
      setTimeout(() => {
        Taro.navigateBack()
      }, 1000)
    } catch (error) {
      Taro.showToast({
        title: '保存失败',
        icon: 'error',
      })
    }
  }

  // 预览主题
  const previewTheme = (themeName: string) => {
    if (themeName === 'auto') {
      const userId = Taro.getStorageSync('userId') || '1'
      const theme = gradientUtils.getThemeByUserId(userId)
      setCurrentTheme(theme)
    } else {
      const theme = gradientThemes.find(t => t.name === themeName)
      setCurrentTheme(theme || gradientThemes[0])
    }
  }

  return (
    <View className="min-h-screen bg-gray-50">
      {/* 当前主题预览 */}
      {currentTheme && (
        <View
          className="mx-4 mt-4 rounded-xl p-6 text-center"
          style={{
            background: currentTheme.background,
            color: currentTheme.textColor
          }}
        >
          <Text className="text-lg font-bold mb-2">当前主题预览</Text>
          <Text className="text-sm opacity-90 px-2">{currentTheme.description}</Text>
          <View className="mt-4 flex justify-center space-x-4">
            <View
              className="w-8 h-8 rounded-full"
              style={{ backgroundColor: currentTheme.primary }}
            ></View>
            {currentTheme.secondary && (
              <View
                className="w-8 h-8 rounded-full"
                style={{ backgroundColor: currentTheme.secondary }}
              ></View>
            )}
          </View>
        </View>
      )}

      {/* 主题选择 */}
      <View className="mt-4">
        <CellGroup>
          <Cell
            className="px-4 py-2"
            title={
              <View className="flex items-center justify-between w-full">
                <View>
                  <Text className="font-medium">智能主题</Text>
                  <Text className="text-sm text-gray-500 mt-1">
                    根据您的用户ID自动选择个性化主题
                  </Text>
                </View>
                <Radio
                  checked={selectedTheme === 'auto'}
                  onChange={() => {
                    setSelectedTheme('auto')
                    previewTheme('auto')
                  }}
                />
              </View>
            }
            onClick={() => {
              setSelectedTheme('auto')
              previewTheme('auto')
            }}
          />
        </CellGroup>

        <View className="mt-4">
          <Text className="text-sm text-gray-600 px-4 mb-2">手动选择主题</Text>
          <CellGroup>
            {gradientThemes.map((theme) => (
              <Cell
                key={theme.name}
                className="px-4 py-3"
                title={
                  <View className="flex items-center justify-between w-full">
                    <View className="flex items-center">
                      <View
                        className="w-6 h-6 rounded-full mr-3"
                        style={{ background: theme.background }}
                      ></View>
                      <View>
                        <Text className="font-medium">{theme.description.split(' - ')[0]}</Text>
                        <Text className="text-sm text-gray-500 mt-1">
                          {theme.description.split(' - ')[1]}
                        </Text>
                      </View>
                    </View>
                    <Radio
                      checked={selectedTheme === theme.name}
                      onChange={() => {
                        setSelectedTheme(theme.name)
                        previewTheme(theme.name)
                      }}
                    />
                  </View>
                }
                onClick={() => {
                  setSelectedTheme(theme.name)
                  previewTheme(theme.name)
                }}
              />
            ))}
          </CellGroup>
        </View>
      </View>

      {/* 保存按钮 */}
      <FixedButton text={'保存主题设置'} background={currentTheme?.background || '#1890ff'} onClick={() => saveTheme(selectedTheme)} />

      {/* 底部安全区域 */}
      <View className="h-20"></View>
    </View>
  )
}

export default ThemeSelector
