package qualityowner

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

	"hfb_sys/backend/internal/middleware"
	"hfb_sys/backend/pkg/response"

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

type Handler struct {
	service *Service
}

func NewHandler(service *Service) *Handler {
	return &Handler{service: service}
}

func (h *Handler) Status(c *gin.Context) {
	userID, ok := currentUserID(c)
	if !ok {
		response.Unauthorized(c, "缺少用户上下文")
		return
	}
	item, err := h.service.Status(c.Request.Context(), userID)
	if err != nil {
		writeError(c, err)
		return
	}
	response.OK(c, item)
}

func (h *Handler) Activate(c *gin.Context) {
	userID, ok := currentUserID(c)
	if !ok {
		response.Unauthorized(c, "缺少用户上下文")
		return
	}
	item, err := h.service.Activate(c.Request.Context(), userID)
	if err != nil {
		writeError(c, err)
		return
	}
	response.OK(c, item)
}

func (h *Handler) Cancel(c *gin.Context) {
	userID, ok := currentUserID(c)
	if !ok {
		response.Unauthorized(c, "缺少用户上下文")
		return
	}
	item, err := h.service.Cancel(c.Request.Context(), userID, AuditMeta{
		IP:        c.ClientIP(),
		UserAgent: c.GetHeader("User-Agent"),
		RequestID: middleware.GetRequestID(c),
	})
	if err != nil {
		writeError(c, err)
		return
	}
	response.OK(c, item)
}

func (h *Handler) AdminSet(c *gin.Context) {
	adminID, ok := currentAdminID(c)
	if !ok {
		response.Unauthorized(c, "缺少管理员上下文")
		return
	}
	userID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || userID == 0 {
		response.BadRequest(c, "用户 ID 不正确")
		return
	}
	var req AdminSetRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "请填写操作原因")
		return
	}
	item, err := h.service.AdminSet(c.Request.Context(), adminID, userID, req, AuditMeta{
		IP:        c.ClientIP(),
		UserAgent: c.GetHeader("User-Agent"),
		RequestID: middleware.GetRequestID(c),
	})
	if err != nil {
		writeError(c, err)
		return
	}
	response.OK(c, item)
}

func currentUserID(c *gin.Context) (uint64, bool) {
	value, ok := c.Get(middleware.ContextUserID)
	if !ok {
		return 0, false
	}
	id, ok := value.(uint64)
	return id, ok
}

func currentAdminID(c *gin.Context) (uint64, bool) {
	value, ok := c.Get(middleware.ContextAdminID)
	if !ok {
		return 0, false
	}
	id, ok := value.(uint64)
	return id, ok
}

func writeError(c *gin.Context, err error) {
	response.RecordError(c, err)
	switch {
	case errors.Is(err, ErrDependencyUnavailable):
		response.ServiceUnavailable(c, "数据库未连接")
	case errors.Is(err, ErrInvalidUser):
		response.BadRequest(c, "用户不符合开通条件，请先完成实名认证")
	case errors.Is(err, ErrDepositInsufficient):
		response.Error(c, http.StatusConflict, "insufficient_balance", "余额不足，请先确保可用余额足够缴纳保证金")
	case errors.Is(err, ErrAlreadyActive):
		response.Error(c, http.StatusConflict, "quality_owner_active", "当前已经是优质号主")
	case errors.Is(err, ErrPaymentPending):
		response.Error(c, http.StatusConflict, "quality_owner_payment_pending", "已有待完成的保证金支付，请先完成支付或稍后重试")
	case errors.Is(err, ErrInactive):
		response.Error(c, http.StatusConflict, "quality_owner_inactive", "当前不是优质号主")
	case errors.Is(err, ErrActivePremiumListings):
		var activeErr ActivePremiumListingsError
		errors.As(err, &activeErr)
		response.Error(
			c,
			http.StatusConflict,
			"quality_owner_active_premium_listings",
			fmt.Sprintf("极品专区还有 %d 个进行中账号，请先下架或完成订单后再取消", activeErr.Count),
		)
	case errors.Is(err, ErrInvalidReason):
		response.BadRequest(c, "请填写 2-200 字的操作原因")
	case errors.Is(err, gorm.ErrRecordNotFound):
		response.Error(c, http.StatusNotFound, "not_found", "用户不存在")
	default:
		response.Error(c, http.StatusInternalServerError, "internal_error", "优质号主服务暂时不可用")
	}
}