package handlers

import (
	"encoding/json"
	"fmt"
	"html/template"
	"net/http"
	"net/url"

	"github.com/gin-gonic/gin"
	"go.uber.org/zap"

	"tyapi-server/internal/application/api/commands"
	"tyapi-server/internal/domains/api/dto"
	api_repositories "tyapi-server/internal/domains/api/repositories"
	api_services "tyapi-server/internal/domains/api/services"
	"tyapi-server/internal/domains/api/services/processors"
	"tyapi-server/internal/domains/api/services/processors/qygl"
	"tyapi-server/internal/shared/pdf"
)

// QYGLReportHandler 企业全景报告页面渲染处理器
// 使用 QYGLJ1U9 聚合接口生成企业报告数据，并通过模板引擎渲染 qiye.html
type QYGLReportHandler struct {
	apiRequestService *api_services.ApiRequestService
	logger            *zap.Logger

	reportRepo      api_repositories.ReportRepository
	pdfCacheManager *pdf.PDFCacheManager
}

// NewQYGLReportHandler 创建企业报告页面处理器
func NewQYGLReportHandler(
	apiRequestService *api_services.ApiRequestService,
	logger *zap.Logger,
	reportRepo api_repositories.ReportRepository,
	pdfCacheManager *pdf.PDFCacheManager,
) *QYGLReportHandler {
	return &QYGLReportHandler{
		apiRequestService: apiRequestService,
		logger:            logger,
		reportRepo:        reportRepo,
		pdfCacheManager:   pdfCacheManager,
	}
}

// GetQYGLReportPage 企业全景报告页面
// GET /reports/qygl?ent_code=xxx&ent_name=yyy&ent_reg_no=zzz
func (h *QYGLReportHandler) GetQYGLReportPage(c *gin.Context) {
	// 读取查询参数
	entCode := c.Query("ent_code")
	entName := c.Query("ent_name")
	entRegNo := c.Query("ent_reg_no")

	// 组装 QYGLUY3S 入参
	req := dto.QYGLUY3SReq{
		EntName:  entName,
		EntRegno: entRegNo,
		EntCode:  entCode,
	}

	params, err := json.Marshal(req)
	if err != nil {
		h.logger.Error("序列化企业全景报告入参失败", zap.Error(err))
		c.String(http.StatusInternalServerError, "生成企业报告失败，请稍后重试")
		return
	}

	// 通过 ApiRequestService 调用 QYGLJ1U9 聚合处理器
	options := &commands.ApiCallOptions{}
	callCtx := &processors.CallContext{}

	ctx := c.Request.Context()
	respBytes, err := h.apiRequestService.PreprocessRequestApi(ctx, "QYGLJ1U9", params, options, callCtx)
	if err != nil {
		h.logger.Error("调用企业全景报告处理器失败", zap.Error(err))
		c.String(http.StatusInternalServerError, "生成企业报告失败，请稍后重试")
		return
	}

	var report map[string]interface{}
	if err := json.Unmarshal(respBytes, &report); err != nil {
		h.logger.Error("解析企业全景报告结果失败", zap.Error(err))
		c.String(http.StatusInternalServerError, "生成企业报告失败，请稍后重试")
		return
	}

	reportJSONBytes, err := json.Marshal(report)
	if err != nil {
		h.logger.Error("序列化企业全景报告结果失败", zap.Error(err))
		c.String(http.StatusInternalServerError, "生成企业报告失败，请稍后重试")
		return
	}

	// 使用 template.JS 避免在脚本中被转义，直接作为 JS 对象字面量注入
	reportJSON := template.JS(reportJSONBytes)

	c.HTML(http.StatusOK, "qiye.html", gin.H{
		"ReportJSON": reportJSON,
	})
}

// GetQYGLReportPageByID 通过编号查看企业全景报告页面
// GET /reports/qygl/:id
func (h *QYGLReportHandler) GetQYGLReportPageByID(c *gin.Context) {
	id := c.Param("id")
	if id == "" {
		c.String(http.StatusBadRequest, "报告编号不能为空")
		return
	}

	// 优先从数据库中查询报告记录
	if h.reportRepo != nil {
		if entity, err := h.reportRepo.FindByReportID(c.Request.Context(), id); err == nil && entity != nil {
			reportJSON := template.JS(entity.ReportData)
			c.HTML(http.StatusOK, "qiye.html", gin.H{
				"ReportJSON": reportJSON,
			})
			return
		}
	}

	// 回退到进程内存缓存（兼容老的访问方式）
	report, ok := qygl.GetQYGLReport(id)
	if !ok {
		c.String(http.StatusNotFound, "报告不存在或已过期")
		return
	}

	reportJSONBytes, err := json.Marshal(report)
	if err != nil {
		h.logger.Error("序列化企业全景报告结果失败", zap.Error(err))
		c.String(http.StatusInternalServerError, "生成企业报告失败，请稍后再试")
		return
	}

	reportJSON := template.JS(reportJSONBytes)

	c.HTML(http.StatusOK, "qiye.html", gin.H{
		"ReportJSON": reportJSON,
	})
}

// GetQYGLReportPDFByID 通过编号导出企业全景报告 PDF（基于 headless Chrome 渲染 HTML）
// GET /reports/qygl/:id/pdf
func (h *QYGLReportHandler) GetQYGLReportPDFByID(c *gin.Context) {
	id := c.Param("id")
	if id == "" {
		c.String(http.StatusBadRequest, "报告编号不能为空")
		return
	}

	// 可选：从数据库查一次，用于生成更友好的文件名
	var fileName = "企业全景报告.pdf"
	if h.reportRepo != nil {
		if entity, err := h.reportRepo.FindByReportID(c.Request.Context(), id); err == nil && entity != nil {
			if entity.EntName != "" {
				fileName = fmt.Sprintf("%s_企业全景报告.pdf", entity.EntName)
			}
		}
	}

	// 先尝试从缓存中读取（基于报告ID）
	if h.pdfCacheManager != nil {
		if cachedBytes, hit, _, err := h.pdfCacheManager.GetByReportID(id); err == nil && hit && len(cachedBytes) > 0 {
			h.logger.Info("企业全景报告 PDF 缓存命中",
				zap.String("report_id", id),
				zap.Int("pdf_size", len(cachedBytes)),
			)
			encodedFileName := url.QueryEscape(fileName)
			c.Header("Content-Type", "application/pdf")
			c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", encodedFileName))
			c.Data(http.StatusOK, "application/pdf", cachedBytes)
			return
		}
	}

	// 根据当前请求推断访问协议（支持通过反向代理的 X-Forwarded-Proto）
	scheme := "http"
	if c.Request.TLS != nil {
		scheme = "https"
	} else if forwardedProto := c.Request.Header.Get("X-Forwarded-Proto"); forwardedProto != "" {
		scheme = forwardedProto
	}

	// 构建用于 headless 浏览器访问的完整报告页面 URL
	reportURL := fmt.Sprintf("%s://%s/reports/qygl/%s", scheme, c.Request.Host, id)

	h.logger.Info("开始生成企业全景报告 PDF（headless Chrome）",
		zap.String("report_id", id),
		zap.String("url", reportURL),
	)

	pdfGen := pdf.NewHTMLPDFGenerator(h.logger)
	pdfBytes, err := pdfGen.GenerateFromURL(c.Request.Context(), reportURL)
	if err != nil {
		h.logger.Error("生成企业全景报告 PDF 失败", zap.String("report_id", id), zap.Error(err))
		c.String(http.StatusInternalServerError, "生成企业报告 PDF 失败，请稍后重试")
		return
	}

	if len(pdfBytes) == 0 {
		h.logger.Error("生成的企业全景报告 PDF 为空", zap.String("report_id", id))
		c.String(http.StatusInternalServerError, "生成的企业报告 PDF 为空，请稍后重试")
		return
	}

	// 将生成结果写入缓存（忽略写入错误，不影响主流程）
	if h.pdfCacheManager != nil {
		if err := h.pdfCacheManager.SetByReportID(id, pdfBytes); err != nil {
			h.logger.Warn("保存企业全景报告 PDF 到缓存失败",
				zap.String("report_id", id),
				zap.Error(err),
			)
		}
	}

	encodedFileName := url.QueryEscape(fileName)
	c.Header("Content-Type", "application/pdf")
	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", encodedFileName))
	c.Data(http.StatusOK, "application/pdf", pdfBytes)
}