package com.se.simu.controller;

import com.se.simu.domain.LayerVo;
import com.se.simu.helper.StringHelper;
import com.se.simu.helper.WebHelper;
import com.se.simu.service.WaterService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;
import java.io.File;

/**
 * 内涝控制器
 *
 * @author WWW
 * @date   2024-07-16
 */
@Api(tags = "内涝管理")
@Slf4j
@RestController
@RequestMapping("/waterlogging")
public class WaterController {
    @Resource
    WaterService waterService;

    private final static int MIN_SIZE = 10;

    private final static int MAX_SIZE = 80000;

    private final static long Y2000 = 949334400000L;

    @ApiOperation(value = "获取当前时间")
    @GetMapping("/getTime")
    public Object getTime() {
        return System.currentTimeMillis();
    }

    @ApiOperation(value = "获取元数据信息")
    @GetMapping("/{serviceName}/layer.json")
    public void getLayer(@PathVariable String serviceName, HttpServletResponse res) {
        try {
            if (!validate(serviceName, res)) {
                return;
            }

            LayerVo layer = waterService.getLayer(serviceName);

            WebHelper.writeJson2Page(res, HttpStatus.OK, layer);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            WebHelper.writeStr2Page(res, HttpStatus.INTERNAL_SERVER_ERROR, ex.getMessage());
        }
    }

    @ApiOperation(value = "获取地形高度图")
    @GetMapping("/{serviceName}/terrain")
    public void getTerraMap(@PathVariable String serviceName, Integer width, Integer height, HttpServletResponse res) {
        try {
            if (!validate(serviceName, width, height, res)) {
                return;
            }

            String file = waterService.getTerraMap(serviceName, width, height);
            writeFile(file, res);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            WebHelper.writeStr2Page(res, HttpStatus.INTERNAL_SERVER_ERROR, ex.getMessage());
        }
    }

    @ApiOperation(value = "获取水面高度图")
    @GetMapping("/{serviceName}/waterMap")
    public void getWaterMap(@PathVariable String serviceName, Integer width, Integer height, Long timestamp, HttpServletResponse res) {
        try {
            if (!validate(serviceName, width, height, timestamp, res)) {
                return;
            }

            String file = waterService.getWaterMap(serviceName, width, height);
            writeFile(file, res);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            WebHelper.writeStr2Page(res, HttpStatus.INTERNAL_SERVER_ERROR, ex.getMessage());
        }
    }

    @ApiOperation(value = "获取水流向流速图")
    @GetMapping("/{serviceName}/flowMap")
    public void getFlowMap(@PathVariable String serviceName, Integer width, Integer height, Long timestamp, HttpServletResponse res) {
        try {
            if (!validate(serviceName, width, height, timestamp, res)) {
                return;
            }

            String file = waterService.getFlowMap(serviceName, width, height, timestamp);
            writeFile(file, res);
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            WebHelper.writeStr2Page(res, HttpStatus.INTERNAL_SERVER_ERROR, ex.getMessage());
        }
    }

    private boolean validate(String serviceName, HttpServletResponse res) {
        if (StringHelper.isEmpty(serviceName)) {
            return WebHelper.writeJson2Page(res, HttpStatus.BAD_REQUEST, "服务名不能为空");
        }

        return true;
    }

    private boolean validate(String serviceName, Integer width, Integer height, HttpServletResponse res) {
        return validate(serviceName, width, height, Y2000, res);
    }

    /**
     * 验证
     */
    private boolean validate(String serviceName, Integer width, Integer height, Long timestamp, HttpServletResponse res) {
        if (StringHelper.isEmpty(serviceName)) {
            return WebHelper.writeJson2Page(res, HttpStatus.BAD_REQUEST, "服务名不能为空");
        }
        if (null == width || width < MIN_SIZE || width > MAX_SIZE) {
            return WebHelper.writeJson2Page(res, HttpStatus.BAD_REQUEST, "图像宽度不能为空且取值范围为" + MIN_SIZE + "~" + MAX_SIZE + "之间");
        }
        if (null == height || height < MIN_SIZE || height > MAX_SIZE) {
            return WebHelper.writeJson2Page(res, HttpStatus.BAD_REQUEST, "图像高度不能为空且取值范围为" + MIN_SIZE + "~" + MAX_SIZE + "之间");
        }
        if (null == timestamp || timestamp < Y2000) {
            return WebHelper.writeJson2Page(res, HttpStatus.BAD_REQUEST, "时间不能为空且大于2000年");
        }

        return true;
    }

    /**
     * 写文件
     */
    private boolean writeFile(String path, HttpServletResponse res) throws Exception {
        if (StringHelper.isEmpty(path)) {
            return WebHelper.writeJson2Page(res, HttpStatus.INTERNAL_SERVER_ERROR, "生成PNG失败");
        }
        File file = new File(path);
        if (!file.exists() || file.isDirectory()) {
            return WebHelper.writeJson2Page(res, HttpStatus.INTERNAL_SERVER_ERROR, "PNG文件找不到");
        }

        WebHelper.download(path, file.getName(), res);

        return true;
    }
}