package handler

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"

	"github.com/wangjia/jiu/backend/internal/model"
)

type ErrorReportHandler struct{ db *gorm.DB }

func NewErrorReportHandler(db *gorm.DB) *ErrorReportHandler {
	return &ErrorReportHandler{db: db}
}

type submitErrorRequest struct {
	ErrorType   string `json:"error_type"   binding:"required"`
	AppVersion  string `json:"app_version"`
	Platform    string `json:"platform"`
	Username    string `json:"username"`
	ShopID      uint64 `json:"shop_id"`
	ShopNo      string `json:"shop_no"`
	Role        string `json:"role"`
	ProductInfo string `json:"product_info"`
	ErrorMsg    string `json:"error_msg" binding:"required"`
	StackTrace  string `json:"stack_trace"`
	OccurredAt  int64  `json:"occurred_at"` // Unix 毫秒
}

// Submit POST /api/v1/public/errors
func (h *ErrorReportHandler) Submit(c *gin.Context) {
	var req submitErrorRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	occurredAt := time.Now()
	if req.OccurredAt > 0 {
		occurredAt = time.UnixMilli(req.OccurredAt)
	}

	stack := req.StackTrace
	const maxStack = 4000
	if len(stack) > maxStack {
		stack = stack[:maxStack]
	}

	report := model.ErrorReport{
		ErrorType:   req.ErrorType,
		AppVersion:  req.AppVersion,
		Platform:    req.Platform,
		Username:    req.Username,
		ShopID:      req.ShopID,
		ShopNo:      req.ShopNo,
		Role:        req.Role,
		ProductInfo: req.ProductInfo,
		ClientIP:    c.ClientIP(),
		ErrorMsg:    req.ErrorMsg,
		StackTrace:  stack,
		OccurredAt:  occurredAt,
	}

	if err := h.db.Create(&report).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "submit failed"})
		return
	}

	c.JSON(http.StatusCreated, gin.H{"id": report.ID})
}

// List GET /api/v1/admin/errors  (superadmin only)
func (h *ErrorReportHandler) List(c *gin.Context) {
	var q struct {
		ErrorType string `form:"error_type"`
		Username  string `form:"username"`
		Platform  string `form:"platform"`
		Page      int    `form:"page,default=1"`
		PageSize  int    `form:"page_size,default=50"`
	}
	if err := c.ShouldBindQuery(&q); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if q.PageSize <= 0 || q.PageSize > 200 {
		q.PageSize = 50
	}
	if q.Page <= 0 {
		q.Page = 1
	}

	db := h.db.Model(&model.ErrorReport{})
	if q.ErrorType != "" {
		db = db.Where("error_type = ?", q.ErrorType)
	}
	if q.Username != "" {
		db = db.Where("username LIKE ?", "%"+q.Username+"%")
	}
	if q.Platform != "" {
		db = db.Where("platform = ?", q.Platform)
	}

	var total int64
	db.Count(&total)

	var reports []model.ErrorReport
	db.Order("id DESC").Offset((q.Page - 1) * q.PageSize).Limit(q.PageSize).Find(&reports)

	c.JSON(http.StatusOK, gin.H{
		"data":      reports,
		"total":     total,
		"page":      q.Page,
		"page_size": q.PageSize,
	})
}