// src/views/Community/components/DynamicNewsCard/PaginationControl.js
// 分页控制器组件

import React, { useState } from 'react';
import {
  Box,
  HStack,
  Button,
  Input,
  Text,
  IconButton,
  useColorModeValue,
  useToast,
} from '@chakra-ui/react';
import {
  ChevronLeftIcon,
  ChevronRightIcon,
} from '@chakra-ui/icons';

/**
 * 分页控制器组件（使用 React.memo 优化，避免不必要的重新渲染）
 * @param {number} currentPage - 当前页码
 * @param {number} totalPages - 总页数
 * @param {Function} onPageChange - 页码改变回调
 */
const PaginationControl = React.memo(({ currentPage, totalPages, onPageChange }) => {
  const [jumpPage, setJumpPage] = useState('');
  const toast = useToast();

  const buttonBg = useColorModeValue('white', 'gray.700');
  const activeBg = useColorModeValue('blue.500', 'blue.400');
  const activeColor = useColorModeValue('white', 'white');
  const borderColor = useColorModeValue('gray.300', 'gray.600');
  const hoverBg = useColorModeValue('gray.100', 'gray.600');

  // 生成页码数字列表（智能省略）
  const getPageNumbers = () => {
    const pageNumbers = [];
    const maxVisible = 5; // 最多显示5个页码（精简版）

    if (totalPages <= maxVisible) {
      // 总页数少，显示全部
      for (let i = 1; i <= totalPages; i++) {
        pageNumbers.push(i);
      }
    } else {
      // 总页数多，使用省略号
      if (currentPage <= 3) {
        // 当前页在前面
        for (let i = 1; i <= 4; i++) {
          pageNumbers.push(i);
        }
        pageNumbers.push('...');
        pageNumbers.push(totalPages);
      } else if (currentPage >= totalPages - 2) {
        // 当前页在后面
        pageNumbers.push(1);
        pageNumbers.push('...');
        for (let i = totalPages - 3; i <= totalPages; i++) {
          pageNumbers.push(i);
        }
      } else {
        // 当前页在中间
        pageNumbers.push(1);
        pageNumbers.push('...');
        pageNumbers.push(currentPage);
        pageNumbers.push('...');
        pageNumbers.push(totalPages);
      }
    }

    return pageNumbers;
  };

  // 处理页码跳转
  const handleJump = () => {
    const page = parseInt(jumpPage, 10);

    if (isNaN(page)) {
      toast({
        title: '请输入有效的页码',
        status: 'warning',
        duration: 2000,
        isClosable: true,
      });
      return;
    }

    if (page < 1 || page > totalPages) {
      toast({
        title: `页码范围：1 - ${totalPages}`,
        status: 'warning',
        duration: 2000,
        isClosable: true,
      });
      return;
    }

    onPageChange(page);
    setJumpPage('');
  };

  // 处理回车键
  const handleKeyPress = (e) => {
    if (e.key === 'Enter') {
      handleJump();
    }
  };

  const pageNumbers = getPageNumbers();

  return (
    <Box mb={3}>
      <HStack spacing={1.5} justify="center" flexWrap="wrap">
        {/* 上一页按钮 */}
        <IconButton
          icon={<ChevronLeftIcon />}
          size="xs"
          onClick={() => onPageChange(currentPage - 1)}
          isDisabled={currentPage === 1}
          bg={buttonBg}
          borderWidth="1px"
          borderColor={borderColor}
          _hover={{ bg: hoverBg }}
          aria-label="上一页"
          title="上一页"
        />

        {/* 数字页码列表 */}
        {pageNumbers.map((page, index) => {
          if (page === '...') {
            return (
              <Text
                key={`ellipsis-${index}`}
                px={1}
                fontSize="xs"
                color="gray.500"
              >
                ...
              </Text>
            );
          }

          return (
            <Button
              key={page}
              size="xs"
              onClick={() => onPageChange(page)}
              bg={currentPage === page ? activeBg : buttonBg}
              color={currentPage === page ? activeColor : undefined}
              borderWidth="1px"
              borderColor={currentPage === page ? activeBg : borderColor}
              _hover={{
                bg: currentPage === page ? activeBg : hoverBg,
              }}
              minW="28px"
            >
              {page}
            </Button>
          );
        })}

        {/* 下一页按钮 */}
        <IconButton
          icon={<ChevronRightIcon />}
          size="xs"
          onClick={() => onPageChange(currentPage + 1)}
          isDisabled={currentPage === totalPages}
          bg={buttonBg}
          borderWidth="1px"
          borderColor={borderColor}
          _hover={{ bg: hoverBg }}
          aria-label="下一页"
          title="下一页"
        />

        {/* 分隔线 */}
        <Box w="1px" h="20px" bg={borderColor} mx={1.5} />

        {/* 输入框跳转 */}
        <HStack spacing={1.5}>
          <Text fontSize="xs" color="gray.600">
            跳转到
          </Text>
          <Input
            size="xs"
            width="50px"
            type="number"
            min={1}
            max={totalPages}
            value={jumpPage}
            onChange={(e) => setJumpPage(e.target.value)}
            onKeyPress={handleKeyPress}
            placeholder="页"
            bg={buttonBg}
            borderColor={borderColor}
          />
          <Button
            size="xs"
            colorScheme="blue"
            onClick={handleJump}
          >
            跳转
          </Button>
        </HStack>
      </HStack>
    </Box>
  );
}, (prevProps, nextProps) => {
  // 自定义比较函数：只有当 currentPage 或 totalPages 变化时才重新渲染
  return prevProps.currentPage === nextProps.currentPage &&
         prevProps.totalPages === nextProps.totalPages;
});

export default PaginationControl;