package com.ruoyi.analytics.controller;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.ruoyi.analytics.service.IReportAnalyzerService;
import com.ruoyi.common.annotation.Log;
import com.ruoyi.common.core.controller.BaseController;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.enums.BusinessType;

/**
 * 报表分析API控制器
 * 
 * 提供仪表板数据、报表生成、风险分析等RESTful API接口
 * 
 * @author ruoyi
 * @date 2025-12-19
 */
@RestController
@RequestMapping("/api/reports")
public class ReportsController extends BaseController
{
    @Autowired
    private IReportAnalyzerService reportAnalyzerService;

    /**
     * 获取仪表板数据
     * 
     * @param userId 用户ID (可选)
     * @return 仪表板数据
     */
    @PreAuthorize("@ss.hasPermi('reports:dashboard:query')")
    @GetMapping("/dashboard")
    public AjaxResult getDashboardData(@RequestParam(value = "userId", required = false) Long userId,
                                      @RequestParam(value = "dashboardId", required = false) String dashboardId)
    {
        try {
            Map<String, Object> dashboardData;
            if (dashboardId != null) {
                dashboardData = reportAnalyzerService.getDashboardData(dashboardId, userId);
            } else {
                // 默认仪表板数据
                dashboardData = new HashMap<>();
                dashboardData.put("totalContracts", 150);
                dashboardData.put("totalCredits", 120);
                dashboardData.put("totalAmount", "5000000.00");
                dashboardData.put("pendingApplications", 25);
            }
            return AjaxResult.success("仪表板数据", dashboardData);
        } catch (Exception e) {
            logger.error("获取仪表板数据失败", e);
            return error("获取仪表板数据失败: " + e.getMessage());
        }
    }

    /**
     * 生成报表
     * 
     * @param reportType 报表类型
     * @param parameters 报表参数
     * @return 生成结果
     */
    @PreAuthorize("@ss.hasPermi('reports:generate:add')")
    @Log(title = "报表生成", businessType = BusinessType.INSERT)
    @PostMapping("/generate")
    public AjaxResult generateReport(
            @RequestParam("reportType") String reportType,
            @RequestBody Map<String, Object> parameters)
    {
        try {
            Date startDate = parseDate(parameters.get("startDate"));
            Date endDate = parseDate(parameters.get("endDate"));
            
            String reportId = reportAnalyzerService.generateFinancialReport(reportType, startDate, endDate, parameters);
            return AjaxResult.success("报表生成成功", reportId);
        } catch (Exception e) {
            logger.error("生成报表失败", e);
            return error("生成报表失败: " + e.getMessage());
        }
    }

    /**
     * 导出报表
     * 
     * @param reportId 报表ID
     * @param format 导出格式 (excel/pdf)
     * @param response HTTP响应
     */
    @PreAuthorize("@ss.hasPermi('reports:export:query')")
    @Log(title = "报表导出", businessType = BusinessType.EXPORT)
    @GetMapping("/{reportId}/export")
    public void exportReport(
            @PathVariable("reportId") String reportId,
            @RequestParam(value = "format", defaultValue = "excel") String format,
            HttpServletResponse response)
    {
        try {
            reportAnalyzerService.exportReport(reportId, format, response);
        } catch (Exception e) {
            logger.error("导出报表失败", e);
            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        }
    }

    /**
     * 获取财务报表
     * 
     * @param startDate 开始日期
     * @param endDate 结束日期
     * @param reportType 报表类型
     * @return 财务报表数据
     */
    @PreAuthorize("@ss.hasPermi('reports:financial:query')")
    @GetMapping("/financial")
    public AjaxResult getFinancialReport(
            @RequestParam(value = "startDate", required = false) String startDate,
            @RequestParam(value = "endDate", required = false) String endDate,
            @RequestParam(value = "reportType", defaultValue = "summary") String reportType)
    {
        try {
            // 这里需要实现实际的财务报表获取逻辑
            // Map<String, Object> financialData = reportService.getFinancialReport(startDate, endDate, reportType);
            Map<String, Object> financialData = new HashMap<>();
            financialData.put("totalRevenue", "10000000.00");
            financialData.put("totalCosts", "8000000.00");
            financialData.put("netProfit", "2000000.00");
            financialData.put("profitMargin", "20%"); // 临时模拟
            return AjaxResult.success("财务报表", financialData);
        } catch (Exception e) {
            logger.error("获取财务报表失败", e);
            return error("获取财务报表失败: " + e.getMessage());
        }
    }

    /**
     * 风险分析
     * 
     * @param analysisType 分析类型
     * @param parameters 分析参数
     * @return 风险分析结果
     */
    @PreAuthorize("@ss.hasPermi('reports:risk:query')")
    @PostMapping("/risk-analysis")
    public AjaxResult performRiskAnalysis(
            @RequestParam("analysisType") String analysisType,
            @RequestBody Map<String, Object> parameters)
    {
        try {
            // 这里需要实现实际的风险分析逻辑
            // Map<String, Object> riskAnalysis = reportService.performRiskAnalysis(analysisType, parameters);
            Map<String, Object> riskAnalysis = new HashMap<>();
            riskAnalysis.put("riskLevel", "中等");
            riskAnalysis.put("riskScore", 65);
            riskAnalysis.put("recommendations", "建议加强风险监控"); // 临时模拟
            return AjaxResult.success("风险分析完成", riskAnalysis);
        } catch (Exception e) {
            logger.error("风险分析失败", e);
            return error("风险分析失败: " + e.getMessage());
        }
    }

    /**
     * 获取统计数据
     * 
     * @param dataType 数据类型
     * @param timeRange 时间范围
     * @param groupBy 分组方式
     * @return 统计数据
     */
    @PreAuthorize("@ss.hasPermi('reports:statistics:query')")
    @GetMapping("/statistics")
    public AjaxResult getStatistics(
            @RequestParam("dataType") String dataType,
            @RequestParam(value = "timeRange", defaultValue = "30d") String timeRange,
            @RequestParam(value = "groupBy", defaultValue = "day") String groupBy)
    {
        try {
            // 这里需要实现实际的统计数据获取逻辑
            // Map<String, Object> statistics = reportService.getStatistics(dataType, timeRange, groupBy);
            return AjaxResult.success("统计数据", null); // 临时模拟
        } catch (Exception e) {
            logger.error("获取统计数据失败", e);
            return error("获取统计数据失败: " + e.getMessage());
        }
    }

    /**
     * 创建自定义仪表板
     * 
     * @param userId 用户ID
     * @param dashboardConfig 仪表板配置
     * @return 创建结果
     */
    @PreAuthorize("@ss.hasPermi('reports:dashboard:add')")
    @Log(title = "仪表板", businessType = BusinessType.INSERT)
    @PostMapping("/dashboard/create")
    public AjaxResult createCustomDashboard(
            @RequestParam("userId") Long userId,
            @RequestBody Map<String, Object> dashboardConfig)
    {
        try {
            // 这里需要实现实际的仪表板创建逻辑
            // String dashboardId = reportService.createCustomDashboard(userId, dashboardConfig);
            String dashboardId = "DB" + System.currentTimeMillis(); // 临时模拟
            return AjaxResult.success("仪表板创建成功", dashboardId);
        } catch (Exception e) {
            logger.error("创建仪表板失败", e);
            return error("创建仪表板失败: " + e.getMessage());
        }
    }

    /**
     * 获取报表模板列表
     * 
     * @param category 模板分类
     * @return 模板列表
     */
    @PreAuthorize("@ss.hasPermi('reports:template:query')")
    @GetMapping("/templates")
    public AjaxResult getReportTemplates(@RequestParam(value = "category", required = false) String category)
    {
        try {
            // 这里需要实现实际的报表模板获取逻辑
            // List<Map<String, Object>> templates = reportService.getReportTemplates(category);
            return AjaxResult.success("报表模板", null); // 临时模拟
        } catch (Exception e) {
            logger.error("获取报表模板失败", e);
            return error("获取报表模板失败: " + e.getMessage());
        }
    }

    /**
     * 获取数据趋势分析
     * 
     * @param metric 指标名称
     * @param timeRange 时间范围
     * @return 趋势分析结果
     */
    @PreAuthorize("@ss.hasPermi('reports:trend:query')")
    @GetMapping("/trend/{metric}")
    public AjaxResult getTrendAnalysis(
            @PathVariable("metric") String metric,
            @RequestParam(value = "timeRange", defaultValue = "30d") String timeRange)
    {
        try {
            // 这里需要实现实际的趋势分析逻辑
            // Map<String, Object> trendData = reportService.getTrendAnalysis(metric, timeRange);
            return AjaxResult.success("趋势分析", null); // 临时模拟
        } catch (Exception e) {
            logger.error("获取趋势分析失败", e);
            return error("获取趋势分析失败: " + e.getMessage());
        }
    }

    /**
     * 解析日期参数
     */
    private Date parseDate(Object dateObj) {
        if (dateObj == null) {
            return null;
        }
        
        if (dateObj instanceof Date) {
            return (Date) dateObj;
        }
        
        if (dateObj instanceof String) {
            String dateStr = (String) dateObj;
            if (dateStr.isEmpty()) {
                return null;
            }
            
            try {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                return sdf.parse(dateStr);
            } catch (ParseException e) {
                try {
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                    return sdf.parse(dateStr);
                } catch (ParseException ex) {
                    logger.warn("无法解析日期格式: {}", dateStr);
                    return null;
                }
            }
        }
        
        return null;
    }
}