package api

import (
	"errors"
	"net/http"
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"
	"level_go/internal/model"
	"level_go/internal/service"
)

// LimitBoardHandler 承载涨停板相关 HTTP 接口。
type LimitBoardHandler struct {
	Service *service.LimitBoardService // 涨停板服务，封装统计、分组和导出逻辑。
}

// NewLimitBoardHandler 创建涨停板接口 Handler。
func NewLimitBoardHandler(s *service.LimitBoardService) *LimitBoardHandler {
	return &LimitBoardHandler{Service: s}
}

// GetOverview 返回指定交易日的涨停股连板概览。
func (h *LimitBoardHandler) GetOverview(c *gin.Context) {
	var req model.LimitBoardRequest
	if err := c.ShouldBindQuery(&req); err != nil || req.TradeDate == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "trade_date 参数不能为空"})
		return
	}

	resp, err := h.Service.GetLimitBoardOverview(req.TradeDate)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, resp)
}

// GetOpenLowerGroups 返回昨日涨停且今日继续涨停股票的开盘对比分组。
func (h *LimitBoardHandler) GetOpenLowerGroups(c *gin.Context) {
	var req model.LimitBoardRequest
	if err := c.ShouldBindQuery(&req); err != nil || req.TradeDate == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "trade_date 参数不能为空"})
		return
	}

	resp, err := h.Service.GetLimitOpenCompareGroups(req.TradeDate)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, resp)
}

// GetBreakNextPerformance 返回首板后次日炸板股票的 T+1 表现分页结果。
func (h *LimitBoardHandler) GetBreakNextPerformance(c *gin.Context) {
	req, err := parseLimitBreakNextPerformanceRequest(c, true)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	resp, err := h.Service.GetLimitBreakNextPerformance(req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, resp)
}

// GetSecondCal 返回日期范围内的二板日历统计。
func (h *LimitBoardHandler) GetSecondCal(c *gin.Context) {
	req, err := parseSecondCalRequest(c)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	resp, err := h.Service.GetSecondCal(req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, resp)
}

// parseSecondCalRequest 解析二板日历接口的日期范围参数。
func parseSecondCalRequest(c *gin.Context) (model.SecondCalRequest, error) {
	req := model.SecondCalRequest{
		TradeStartDate: strings.TrimSpace(c.DefaultQuery("tradeStartDate", c.Query("start_date"))),
		TradeEndDate:   strings.TrimSpace(c.DefaultQuery("tradeEndDate", c.Query("end_date"))),
	}
	if req.TradeStartDate == "" {
		return req, errors.New("tradeStartDate 参数不能为空")
	}
	if req.TradeEndDate == "" {
		return req, errors.New("tradeEndDate 参数不能为空")
	}
	if err := validateSecondProfitDateRange(req.TradeStartDate, req.TradeEndDate); err != nil {
		return req, err
	}
	return req, nil
}

// parseLimitBreakNextPerformanceRequest 解析炸板次日表现接口的查询参数。
//
// includePagination 为 false 时跳过分页参数，供 CSV 导出复用同一套日期和过滤条件解析逻辑。
func parseLimitBreakNextPerformanceRequest(c *gin.Context, includePagination bool) (model.LimitBreakNextPerformanceRequest, error) {
	req := model.LimitBreakNextPerformanceRequest{
		TradeStartDate: strings.TrimSpace(c.DefaultQuery("tradeStartDate", c.Query("start_date"))),
		TradeEndDate:   strings.TrimSpace(c.DefaultQuery("tradeEndDate", c.Query("end_date"))),
		Page:           1,
		PageSize:       20,
	}

	if req.TradeStartDate == "" {
		return req, errors.New("tradeStartDate 参数不能为空")
	}
	if req.TradeEndDate == "" {
		return req, errors.New("tradeEndDate 参数不能为空")
	}
	if err := validateSecondProfitDateRange(req.TradeStartDate, req.TradeEndDate); err != nil {
		return req, err
	}

	if includePagination {
		pageText := strings.TrimSpace(c.DefaultQuery("page", "1"))
		page, err := strconv.Atoi(pageText)
		if err != nil || page <= 0 {
			return req, errors.New("page 必须为正整数")
		}
		req.Page = page

		pageSizeText := strings.TrimSpace(c.DefaultQuery("pageSize", "20"))
		pageSize, err := strconv.Atoi(pageSizeText)
		if err != nil || pageSize <= 0 {
			return req, errors.New("pageSize 必须为正整数")
		}
		req.PageSize = pageSize
	}

	tOpenGainLt101, err := parseOptionalBoolQuery(c, "tOpenGainLt101", "tOpenLessThan101", "t_open_gain_lt_101")
	if err != nil {
		return req, errors.New("tOpenGainLt101 必须为布尔值")
	}
	req.TOpenGainLt101 = tOpenGainLt101

	breakTimeBefore1100, err := parseOptionalBoolQuery(c, "breakTimeBefore1100", "tBreakTimeBefore1100", "break_time_before_1100")
	if err != nil {
		return req, errors.New("breakTimeBefore1100 必须为布尔值")
	}
	req.BreakTimeBefore1100 = breakTimeBefore1100

	return req, nil
}

// parseOptionalBoolQuery 从多个兼容参数名中读取可选布尔值。
//
// 返回 nil 表示用户没有传入该过滤项；返回 *bool 表示需要按 true/false 过滤。
func parseOptionalBoolQuery(c *gin.Context, keys ...string) (*bool, error) {
	for _, key := range keys {
		valueText, exists := c.GetQuery(key)
		if !exists {
			continue
		}
		valueText = strings.TrimSpace(valueText)
		if valueText == "" {
			continue
		}
		value, err := strconv.ParseBool(valueText)
		if err != nil {
			return nil, err
		}
		return &value, nil
	}
	return nil, nil
}

// GetOpenThresholdGroups 返回昨日涨停股今日开盘是否低于前收 101% 的分组。
func (h *LimitBoardHandler) GetOpenThresholdGroups(c *gin.Context) {
	var req model.LimitBoardRequest
	if err := c.ShouldBindQuery(&req); err != nil || req.TradeDate == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "trade_date 参数不能为空"})
		return
	}

	resp, err := h.Service.GetLimitOpenThresholdGroups(req.TradeDate)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, resp)
}