package handler

import (
	"photowall/internal/middleware"
	"photowall/internal/service"
	"photowall/pkg/response"
	"strconv"

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

type ClassHandler struct {
	svc *service.ClassService
}

func NewClassHandler(svc *service.ClassService) *ClassHandler {
	return &ClassHandler{svc: svc}
}

// Create POST /api/classes
func (h *ClassHandler) Create(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	var req service.CreateClassReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误："+err.Error())
		return
	}
	class, err := h.svc.Create(userID, &req)
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.Created(c, class)
}

// Detail GET /api/classes/:id
func (h *ClassHandler) Detail(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	userID := middleware.CurrentUserID(c)
	isSuperAdmin := middleware.CurrentRole(c) == "admin"
	detail, err := h.svc.GetDetail(uint(id), userID, isSuperAdmin)
	if err != nil {
		response.NotFound(c, err.Error())
		return
	}
	response.OK(c, detail)
}

// Search GET /api/classes/search
func (h *ClassHandler) Search(c *gin.Context) {
	var req service.SearchClassReq
	if err := c.ShouldBindQuery(&req); err != nil {
		response.BadRequest(c, "参数错误")
		return
	}
	result, err := h.svc.Search(&req)
	if err != nil {
		response.Internal(c, err.Error())
		return
	}
	response.OK(c, result)
}

// JoinBySearch POST /api/classes/join/search
func (h *ClassHandler) JoinBySearch(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	var req service.JoinBySearchReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误："+err.Error())
		return
	}
	if err := h.svc.JoinBySearch(userID, &req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "加入成功"})
}

// JoinByInvitation POST /api/classes/join/invite
func (h *ClassHandler) JoinByInvitation(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	var req service.JoinByInvitationReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "邀请码不能为空")
		return
	}
	class, err := h.svc.JoinByInvitation(userID, &req)
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "加入成功", "class_id": class.ID, "class_name": class.Name})
}

// Mine GET /api/classes/mine
func (h *ClassHandler) Mine(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	list, err := h.svc.ListMyClasses(userID)
	if err != nil {
		response.Internal(c, err.Error())
		return
	}
	response.OK(c, list)
}

// CreateInvitation POST /api/classes/:id/invitation
func (h *ClassHandler) CreateInvitation(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	var body struct {
		MaxUses   int `json:"max_uses"`
		ExpireDays int `json:"expire_days"`
	}
	c.ShouldBindJSON(&body)
	inv, err := h.svc.CreateInvitation(uint(id), userID, body.MaxUses, body.ExpireDays)
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.Created(c, inv)
}

// ListInvitations GET /api/classes/:id/invitations
func (h *ClassHandler) ListInvitations(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	list, err := h.svc.ListInvitations(uint(id), userID)
	if err != nil {
		response.Forbidden(c, err.Error())
		return
	}
	response.OK(c, list)
}

// DisableInvitation DELETE /api/classes/:id/invitations/:inv_id
func (h *ClassHandler) DisableInvitation(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	invID, _ := strconv.ParseUint(c.Param("inv_id"), 10, 64)
	if err := h.svc.DisableInvitation(uint(id), uint(invID), userID); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "已禁用"})
}

// TransferAdmin POST /api/classes/:id/transfer
func (h *ClassHandler) TransferAdmin(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	var body struct {
		ToUserID uint `json:"to_user_id" binding:"required"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		response.BadRequest(c, "请指定目标用户")
		return
	}
	if err := h.svc.TransferAdmin(uint(id), userID, body.ToUserID); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "管理员已转移"})
}

// RemoveMember DELETE /api/classes/:id/members/:user_id
func (h *ClassHandler) RemoveMember(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	targetID, _ := strconv.ParseUint(c.Param("user_id"), 10, 64)
	if err := h.svc.RemoveMember(uint(id), userID, uint(targetID)); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "已移除"})
}

// UploadPhoto POST /api/classes/:id/photos
func (h *ClassHandler) UploadPhoto(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	var body struct {
		PhotoURL string `json:"photo_url" binding:"required"`
		Caption  string `json:"caption"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		response.BadRequest(c, "请先上传图片获取URL")
		return
	}
	photo, err := h.svc.UploadPhoto(uint(id), userID, body.PhotoURL, body.Caption)
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.Created(c, photo)
}

// DeletePhoto DELETE /api/classes/:id/photos/:photo_id
func (h *ClassHandler) DeletePhoto(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	isSuperAdmin := middleware.CurrentRole(c) == "admin"
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	photoID, _ := strconv.ParseUint(c.Param("photo_id"), 10, 64)
	if err := h.svc.DeletePhoto(uint(id), uint(photoID), userID, isSuperAdmin); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "已删除"})
}

// Resubmit POST /api/classes/:id/resubmit
func (h *ClassHandler) Resubmit(c *gin.Context) {
	userID := middleware.CurrentUserID(c)
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	var req service.ResubmitReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "参数错误")
		return
	}
	if err := h.svc.Resubmit(uint(id), userID, &req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "已重新提交审核"})
}