package com.linghu.controller;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.linghu.listener.PlatformExcelListener;
import com.linghu.listener.TypeDropdownWriteHandler;
import com.linghu.mapper.ReferenceMapper;
import com.linghu.model.common.ResponseResult;
import com.linghu.model.entity.Platform;
import com.linghu.model.entity.Reference;
import com.linghu.model.entity.Sectionalization;
import com.linghu.model.entity.Type;
import com.linghu.model.excel.ExcelDataWithRow;
import com.linghu.model.excel.PlatformExcel;
import com.linghu.model.excel.UserExcel;
import com.linghu.model.page.CustomPage;
import com.linghu.service.PlatformService;
import com.linghu.service.TypeService;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.log4j.Log4j;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.ss.usermodel.DataValidation;
import org.apache.poi.ss.usermodel.DataValidationConstraint;
import org.apache.poi.ss.usermodel.DataValidationHelper;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import java.time.LocalDateTime;
import java.util.*;
import java.util.Objects;
import java.util.stream.Collectors;

@RestController
@RequestMapping("/platform")
@Api(value = "平台相关接口", tags = "设置-平台")
@Slf4j
public class PlatformController {


    @Autowired
    private PlatformService platformService;
    @Autowired
    private TypeService typeService;
    @Autowired
    private ReferenceMapper referenceMapper;

    @PostMapping
    @ApiOperation(value = "添加平台")
    public ResponseResult<Platform> add(@RequestBody Platform platform) {
        // 校验平台名称和域名不能为空
        if (!StringUtils.hasText(platform.getPlatform_name())) {
            return ResponseResult.error("平台名称不能为空");
        }
        if (!StringUtils.hasText(platform.getDomain())) {
            return ResponseResult.error("平台域名不能为空");
        }
        platform.setCreate_time(LocalDateTime.now());

        boolean success = platformService.save(platform);
        if (success) {
            return ResponseResult.success(platform);
        }
        return ResponseResult.error("添加平台失败");
    }

    @DeleteMapping("/{platformId}")
    @ApiOperation(value = "删除平台")
    public ResponseResult<Void> delete(@PathVariable Integer platformId) {
        //平台被引用了没
        Integer count = referenceMapper.selectCount(new LambdaQueryWrapper<Reference>().eq(Reference::getPlatform_id, platformId));
        if (count > 0) {
            return ResponseResult.error("该平台被引用中，不能删除");
        }
        boolean success = platformService.removeById(platformId);
        if (success) {
            return ResponseResult.success();
        }
        return ResponseResult.error("删除平台失败");
    }

    @PutMapping
    @ApiOperation(value = "更新平台")
    public ResponseResult<Void> update(@RequestBody Platform platform) {
        // 校验平台名称和域名不能为空
        if (!StringUtils.hasText(platform.getPlatform_name())) {
            return ResponseResult.error("平台名称不能为空");
        }
        if (!StringUtils.hasText(platform.getDomain())) {
            return ResponseResult.error("平台域名不能为空");
        }

        platformService.updateById(platform);

        return ResponseResult.success();
    }

    @GetMapping("/{platformId}")
    @ApiOperation("根据id获取平台")
    public ResponseResult<Platform> getById(@PathVariable Integer platformId) {
        Platform platform = platformService.getById(platformId);
        if (platform != null) {
            return ResponseResult.success(platform);
        }
        return ResponseResult.error("平台不存在");
    }

    @GetMapping("/list")
    @ApiOperation("查询平台列表，不传页数和大小就查全部")
    public ResponseResult<CustomPage<Platform>> list(
            @RequestParam(required = false) Integer page,
            @RequestParam(required = false) Integer pageSize,
            @RequestParam(required = false) Integer type_id) {
        // 构建查询条件并添加排序（按创建时间倒序）
        LambdaQueryWrapper<Platform> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.orderByDesc(Platform::getCreate_time); // 新增的排序条件
        if (type_id != null) {
            queryWrapper.eq(Platform::getType_id, type_id);
        }
        if (page != null && pageSize != null) {
            Page<Platform> pageInfo = new Page<>(page, pageSize);
            Page<Platform> result = platformService.page(pageInfo, queryWrapper);
            return ResponseResult.success(new CustomPage<>(result));
        } else {
            List<Platform> list = platformService.list(queryWrapper);
            CustomPage<Platform> customPage = new CustomPage<>(new Page<>());
            customPage.setRecords(list);
            customPage.setTotal(list.size());
            return ResponseResult.success(customPage);
        }
    }

    @GetMapping("/download")
    @ApiOperation("下载平台模板")
    public ResponseEntity<byte[]> downloadTemplate() throws IOException {
        // 获取所有类型名称
        List<Type> typeList = typeService.list();
        List<String> typeNames = typeList.stream()
                .map(Type::getType_name)
                .collect(Collectors.toList());

        ByteArrayOutputStream out = new ByteArrayOutputStream();

        // 注册下拉框拦截器
        EasyExcel.write(out, PlatformExcel.class)
                .registerWriteHandler(new TypeDropdownWriteHandler(typeNames))
                .sheet("平台模板")
                .doWrite(new ArrayList<>());

        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=platform_template.xlsx")
                .contentType(MediaType.APPLICATION_OCTET_STREAM)
                .body(out.toByteArray());
    }

    @PostMapping("/import")
    @ApiOperation("导入平台数据")
    public ResponseResult<String> importPlatforms(@RequestParam("file") MultipartFile file) {
        try {
            if (file.isEmpty()) {
                return ResponseResult.error("上传文件不能为空");
            }

            // 获取数据库中的旧数据
            List<Platform> oldPlatforms = platformService.list();

            // 使用自定义监听器读取数据（包含行号）
            PlatformExcelListener listener = new PlatformExcelListener();
            EasyExcel.read(file.getInputStream())
                    .head(PlatformExcel.class)
                    .sheet()
                    .registerReadListener(listener)
                    .doRead();

            List<ExcelDataWithRow<PlatformExcel>> excelList = listener.getDataList();
            List<Platform> platforms = new ArrayList<>();
            List<String> errorMessages = new ArrayList<>();

            // 遍历数据并验证
            for (ExcelDataWithRow<PlatformExcel> excelData : excelList) {
                int rowNum = excelData.getRowNumber();
                PlatformExcel excel = excelData.getData();
                List<String> rowErrors = new ArrayList<>();

                // 验证逻辑
                if (!StringUtils.hasText(excel.getPlatform_name())) {
                    rowErrors.add("平台名称不能为空");
                }
                if (!StringUtils.hasText(excel.getDomain())) {
                    rowErrors.add("平台域名不能为空");
                }

                // 查找类型（仅当类型名称不为空时检查，避免空指针）
                Integer typeId = null;
                if (StringUtils.hasText(excel.getType_name())) {
                    Type typeByName = typeService.getTypeByName(excel.getType_name());
                    if (typeByName == null) {
                        rowErrors.add("未知的平台类型: " + excel.getType_name());
                    } else {
                        typeId = typeByName.getType_id();
                    }
                } else {
                    rowErrors.add("平台类型不能为空");
                }

                if (!rowErrors.isEmpty()) {
                    errorMessages.add(String.format("第%d行错误: %s", rowNum, String.join("；", rowErrors)));
                } else {
                    // 构建Platform对象
                    Platform platform = new Platform();
                    platform.setPlatform_name(excel.getPlatform_name());
                    platform.setDomain(excel.getDomain());
                    platform.setType_id(typeId);
                    platform.setCreate_time(LocalDateTime.now());

                    // 检查重复性
                    boolean isDuplicate = false;
                    for (Platform oldPlatform : oldPlatforms) {
                        // 判断重复的条件，这里假设平台名称和域名都相同才算重复
                        if (oldPlatform.getPlatform_name().equals(platform.getPlatform_name()) &&
                                oldPlatform.getDomain().equals(platform.getDomain())) {
                            isDuplicate = true;
                            break;
                        }
                    }

                    // 如果不重复才添加到导入列表
                    if (!isDuplicate) {
                        platforms.add(platform);
                    }
                }
            }

            // 错误处理
            if (!errorMessages.isEmpty()) {
                StringBuilder errorMsg = new StringBuilder();
                errorMsg.append("导入失败，共").append(errorMessages.size()).append("条数据存在错误：\n");
                errorMessages.forEach(msg -> errorMsg.append(msg).append("\n"));
                return ResponseResult.error(400, errorMsg.toString());
            }

            // 无错误时导入
            if (!platforms.isEmpty()) {
                platformService.saveBatch(platforms);
                return ResponseResult.success("导入成功，新增" + platforms.size() + "条数据");
            } else {
                return ResponseResult.success("导入完成，没有新增数据（所有数据均已存在）");
            }

        } catch (Exception e) {
            log.error("文件解析失败", e);
            return ResponseResult.error("文件解析失败：" + e.getMessage());
        }
    }
}