package interfaces

import (
	"net/http"
	"strconv"

	"mengstack/internal/kernel/response"
	"mengstack/internal/modules/notification/application"
	"mengstack/internal/modules/notification/domain"

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

type Handler struct {
	svc *application.Service
}

func NewHandler(svc *application.Service) *Handler {
	return &Handler{svc: svc}
}

// Create godoc
// @Summary      创建通知
// @Description  向指定用户发送通知
// @Tags         Notification
// @Accept       json
// @Produce      json
// @Param        request  body      domain.CreateNotificationRequest  true  "通知内容"
// @Success      200      {object}  response.Response{data=domain.NotificationDTO}
// @Failure      400      {object}  response.Response
// @Security     Bearer
// @Security     TenantID
// @Router       /api/v1/notifications [post]
func (h *Handler) Create(c *gin.Context) {
	var req domain.CreateNotificationRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Fail(c, response.NewBadRequest("invalid request: "+err.Error()))
		return
	}
	tenantID := c.GetString("tenant_id")
	n, err := h.svc.Create(c.Request.Context(), tenantID, &req)
	if err != nil {
		response.HandleError(c, err)
		return
	}
	response.Success(c, n)
}

// Get godoc
// @Summary      获取通知详情
// @Description  根据 ID 获取指定通知的详细信息
// @Tags         Notification
// @Produce      json
// @Param        id  path      int  true  "通知 ID"
// @Success      200  {object}  response.Response{data=domain.NotificationDTO}
// @Failure      400  {object}  response.Response
// @Failure      404  {object}  response.Response
// @Security     Bearer
// @Security     TenantID
// @Router       /api/v1/notifications/{id} [get]
func (h *Handler) Get(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.Fail(c, response.NewBadRequest("invalid id"))
		return
	}
	tenantID := c.GetString("tenant_id")
	n, err := h.svc.Get(c.Request.Context(), tenantID, uint(id))
	if err != nil {
		response.HandleError(c, err)
		return
	}
	if n == nil {
		response.Fail(c, response.NewBadRequest("notification not found"))
		return
	}
	response.Success(c, n)
}

// ListByUser godoc
// @Summary      获取用户通知列表
// @Description  分页获取指定用户的通知列表
// @Tags         Notification
// @Produce      json
// @Param        userId    path      int   true  "用户 ID"
// @Param        page      query     int   false  "页码（默认 1）"
// @Param        page_size query     int   false  "每页条数（默认 20）"
// @Success      200  {object}  response.Response
// @Failure      400  {object}  response.Response
// @Failure      500  {object}  response.Response
// @Security     Bearer
// @Security     TenantID
// @Router       /api/v1/notifications/user/{userId} [get]
func (h *Handler) ListByUser(c *gin.Context) {
	userID, err := strconv.ParseUint(c.Param("userId"), 10, 64)
	if err != nil {
		response.Fail(c, response.NewBadRequest("invalid user_id"))
		return
	}
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
	tenantID := c.GetString("tenant_id")
	notifications, total, err := h.svc.ListByUser(c.Request.Context(), tenantID, uint(userID), page, pageSize)
	if err != nil {
		response.HandleError(c, err)
		return
	}
	response.Success(c, gin.H{
		"items": notifications,
		"total": total,
		"page":  page,
	})
}

// MarkAsRead godoc
// @Summary      标记通知已读
// @Description  将指定通知标记为已读
// @Tags         Notification
// @Param        id  path      int  true  "通知 ID"
// @Success      200  {object}  response.Response
// @Failure      400  {object}  response.Response
// @Failure      404  {object}  response.Response
// @Security     Bearer
// @Security     TenantID
// @Router       /api/v1/notifications/{id}/read [put]
func (h *Handler) MarkAsRead(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.Fail(c, response.NewBadRequest("invalid id"))
		return
	}
	tenantID := c.GetString("tenant_id")
	if err := h.svc.MarkAsRead(c.Request.Context(), tenantID, uint(id)); err != nil {
		response.HandleError(c, err)
		return
	}
	response.Success(c, nil)
}

// MarkAllAsRead godoc
// @Summary      全部标记已读
// @Description  将当前用户的所有通知标记为已读
// @Tags         Notification
// @Produce      json
// @Success      200  {object}  response.Response
// @Failure      500  {object}  response.Response
// @Security     Bearer
// @Security     TenantID
// @Router       /api/v1/notifications/read-all [put]
func (h *Handler) MarkAllAsRead(c *gin.Context) {
	userID := c.GetUint("user_id")
	tenantID := c.GetString("tenant_id")
	if err := h.svc.MarkAllAsRead(c.Request.Context(), tenantID, userID); err != nil {
		response.HandleError(c, err)
		return
	}
	response.Success(c, nil)
}

// CountUnread godoc
// @Summary      获取未读通知数
// @Description  获取当前用户的未读通知数量
// @Tags         Notification
// @Produce      json
// @Success      200  {object}  response.Response
// @Failure      500  {object}  response.Response
// @Security     Bearer
// @Security     TenantID
// @Router       /api/v1/notifications/unread-count [get]
func (h *Handler) CountUnread(c *gin.Context) {
	userID := c.GetUint("user_id")
	tenantID := c.GetString("tenant_id")
	count, err := h.svc.CountUnread(c.Request.Context(), tenantID, userID)
	if err != nil {
		response.HandleError(c, err)
		return
	}
	response.Success(c, gin.H{"count": count})
}

// Delete godoc
// @Summary      删除通知
// @Description  删除指定通知
// @Tags         Notification
// @Param        id  path      int  true  "通知 ID"
// @Success      200  {object}  response.Response
// @Failure      400  {object}  response.Response
// @Failure      404  {object}  response.Response
// @Security     Bearer
// @Security     TenantID
// @Router       /api/v1/notifications/{id} [delete]
func (h *Handler) Delete(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.Fail(c, response.NewBadRequest("invalid id"))
		return
	}
	tenantID := c.GetString("tenant_id")
	if err := h.svc.Delete(c.Request.Context(), tenantID, uint(id)); err != nil {
		response.HandleError(c, err)
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 0, "message": "deleted"})
}