import React, { useEffect, useState } from 'react'
import { useParams } from 'react-router-dom'
import { useTranslation } from 'react-i18next'
import { motion, AnimatePresence } from 'framer-motion'

import { api } from '../__data__/api/api'
import { formatDate } from '../utils/dayjs-config'
import {
  Alert,
  AlertIcon,
  Box,
  Center,
  Container,
  Spinner,
  Text,
  Heading,
  Badge,
  Flex,
  useColorMode,
} from '@chakra-ui/react'
import { UserCard } from '../components/user-card'
import { StudentListView } from './style'

const UserPage = () => {
  const { lessonId, accessId } = useParams()
  const { t } = useTranslation()
  const { colorMode } = useColorMode()
  const acc = api.useGetAccessQuery({ accessCode: accessId })
  const [animatedStudents, setAnimatedStudents] = useState([])

  const ls = api.useLessonByIdQuery(lessonId, {
    pollingInterval: 1000,
    skipPollingIfUnfocused: true,
  })
  
  // Эффект для поэтапного появления карточек студентов
  useEffect(() => {
    if (ls.data?.body?.students?.length) {
      // Сначала очищаем список
      setAnimatedStudents([])
      
      // Затем постепенно добавляем студентов для красивой анимации
      const students = [...ls.data.body.students]
      const addStudentWithDelay = (index) => {
        if (index < students.length) {
          setAnimatedStudents(prev => [...prev, {...students[index], isNew: true}])
          
          // Для следующего студента
          setTimeout(() => {
            addStudentWithDelay(index + 1)
          }, 100) // Уменьшенная задержка для более плавной анимации
        }
      }
      
      // Запускаем процесс добавления с небольшой задержкой для лучшего UX
      setTimeout(() => {
        addStudentWithDelay(0)
      }, 300)
    }
  }, [ls.data?.body?.students])
  
  // Эффект для сброса флага "новизны" студентов
  useEffect(() => {
    if (animatedStudents.length > 0) {
      const timeoutId = setTimeout(() => {
        setAnimatedStudents(students => 
          students.map(student => ({...student, isNew: false}))
        )
      }, 2000)
      
      return () => clearTimeout(timeoutId)
    }
  }, [animatedStudents])

  if (acc.isLoading) {
    return (
      <Container maxW="container.xl">
        <Center h="300px">
          <Spinner
            thickness="4px"
            speed="0.65s"
            emptyColor="gray.200"
            color="blue.500"
            size="xl"
          />
        </Center>
      </Container>
    )
  }

  return (
    <Container maxW="container.lg" pt={4}>
      {acc.isLoading && (
        <Center py={4}>
          <Spinner mr={2} />
          <Text>{t('journal.pl.common.sending')}</Text>
        </Center>
      )}
      
      {acc.isSuccess && (
        <motion.div
          initial={{ opacity: 0, y: -10 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{ duration: 0.3 }}
        >
          <Alert status="success" mb={4} borderRadius="lg">
            <AlertIcon />
            {t('journal.pl.common.success')}
          </Alert>
        </motion.div>
      )}

      {acc.error && (
        <Box mb="6" mt="2">
          <Alert status="warning" borderRadius="lg">
            <AlertIcon />
            {(acc as any).error?.data?.body?.errorMessage ===
            'Code is expired' ? (
              t('journal.pl.access.expiredCode')
            ) : (
              <pre>{JSON.stringify(acc.error, null, 4)}</pre>
            )}
          </Alert>
        </Box>
      )}

      <motion.div
        initial={{ opacity: 0 }}
        animate={{ opacity: 1 }}
        transition={{ duration: 0.4 }}
      >
        <Box 
          mb={6} 
          p={5} 
          borderRadius="xl" 
          bg={colorMode === "light" ? "gray.50" : "gray.700"}
          boxShadow="md"
        >
          <Heading fontSize="xl" fontWeight={600} mb={2}>
            {t('journal.pl.lesson.topicTitle')} 
            <Box as="span" ml={2} color={colorMode === "light" ? "blue.500" : "blue.300"}>
              {ls.data?.body?.name}
            </Box>
          </Heading>

          <Flex align="center" justify="space-between" mt={3}>
            <Text color={colorMode === "light" ? "gray.600" : "gray.300"}>
              {formatDate(ls.data?.body?.date, t('journal.pl.lesson.dateFormat'))}
            </Text>
            
            <Badge colorScheme="green" fontSize="md" borderRadius="full" px={3} py={1}>
              {t('journal.pl.common.people')}: {animatedStudents.length}
            </Badge>
          </Flex>
        </Box>
      </motion.div>

      <motion.div
        initial={{ opacity: 0 }}
        animate={{ opacity: 1 }}
        transition={{ duration: 0.4, delay: 0.2 }}
      >
        {animatedStudents.length > 0 ? (
          <StudentListView>
            <AnimatePresence initial={true}>
              {animatedStudents.map((student) => (
                <motion.li
                  key={student.sub}
                  layout
                  initial={{ opacity: 0, scale: 0.6, y: 20 }}
                  animate={{ 
                    opacity: 1, 
                    scale: 1,
                    y: 0,
                    boxShadow: student.isNew 
                      ? ['0 0 0 0 rgba(66, 153, 225, 0)', '0 0 20px 5px rgba(66, 153, 225, 0.7)', '0 0 0 0 rgba(66, 153, 225, 0)'] 
                      : '0 0 0 0 rgba(0, 0, 0, 0)'
                  }}
                  exit={{ opacity: 0, scale: 0.6, y: 20 }}
                  transition={{ 
                    type: "spring", 
                    stiffness: 300, 
                    damping: 25,
                    delay: 0.03 * animatedStudents.indexOf(student), // Уменьшенная задержка для более плавного появления
                    boxShadow: {
                      repeat: student.isNew ? 3 : 0,
                      duration: 1.5
                    }
                  }}
                >
                  <UserCard
                    width="100%"
                    wrapperAS="div"
                    student={student}
                    present={true}
                    recentlyPresent={student.isNew}
                  />
                </motion.li>
              ))}
            </AnimatePresence>
          </StudentListView>
        ) : (
          ls.data && (
            <Center py={10} px={5}>
              <Box 
                textAlign="center" 
                p={6} 
                borderRadius="xl" 
                bg={colorMode === "light" ? "gray.50" : "gray.700"}
                boxShadow="md"
                width="100%"
                maxWidth="500px"
              >
                <motion.div
                  initial={{ scale: 0.9, opacity: 0 }}
                  animate={{ scale: 1, opacity: 1 }}
                  transition={{ duration: 0.5, delay: 0.3 }}
                >
                  <Heading size="md" mb={4}>{t('journal.pl.lesson.noStudents')}</Heading>
                  <Text>{t('journal.pl.lesson.waitForStudents')}</Text>
                </motion.div>
              </Box>
            </Center>
          )
        )}
      </motion.div>
    </Container>
  )
}

export default UserPage