package handler

import (
	"carrot_bbs/internal/dto"
	"carrot_bbs/internal/model"
	"carrot_bbs/internal/pkg/response"
	"carrot_bbs/internal/service"

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

// PushHandler 推送处理器
type PushHandler struct {
	pushService service.PushService
}

// NewPushHandler 创建推送处理器
func NewPushHandler(pushService service.PushService) *PushHandler {
	return &PushHandler{
		pushService: pushService,
	}
}

// RegisterDevice 注册设备
// POST /api/v1/push/devices
func (h *PushHandler) RegisterDevice(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "")
		return
	}

	var req dto.RegisterDeviceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	// 验证设备类型
	deviceType := model.DeviceType(req.DeviceType)
	if !isValidDeviceType(deviceType) {
		response.BadRequest(c, "invalid device type")
		return
	}

	err := h.pushService.RegisterDevice(c.Request.Context(), userID, req.DeviceID, deviceType, req.PushToken)
	if err != nil {
		response.InternalServerError(c, "failed to register device")
		return
	}

	response.SuccessWithMessage(c, "device registered successfully", nil)
}

// UnregisterDevice 注销设备
// DELETE /api/v1/push/devices/:device_id
func (h *PushHandler) UnregisterDevice(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "")
		return
	}

	deviceID := c.Param("device_id")
	if deviceID == "" {
		response.BadRequest(c, "device_id is required")
		return
	}

	err := h.pushService.UnregisterDevice(c.Request.Context(), deviceID)
	if err != nil {
		response.InternalServerError(c, "failed to unregister device")
		return
	}

	response.SuccessWithMessage(c, "device unregistered successfully", nil)
}

// GetMyDevices 获取当前用户的设备列表
// GET /api/v1/push/devices
func (h *PushHandler) GetMyDevices(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "")
		return
	}

	// 这里需要从DeviceTokenRepository获取设备列表
	// 由于PushService接口没有提供获取设备列表的方法，我们暂时返回空列表
	// TODO: 在PushService接口中添加GetUserDevices方法
	_ = userID // 避免未使用变量警告

	response.Success(c, []*dto.DeviceTokenResponse{})
}

// GetPushRecords 获取推送记录
// GET /api/v1/push/records
func (h *PushHandler) GetPushRecords(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "")
		return
	}

	records, err := h.pushService.GetPendingPushes(c.Request.Context(), userID)
	if err != nil {
		response.InternalServerError(c, "failed to get push records")
		return
	}

	response.Success(c, &dto.PushRecordListResponse{
		Records: dto.PushRecordsToResponse(records),
		Total:   int64(len(records)),
	})
}

// 辅助函数：验证设备类型
func isValidDeviceType(deviceType model.DeviceType) bool {
	switch deviceType {
	case model.DeviceTypeIOS, model.DeviceTypeAndroid, model.DeviceTypeWeb:
		return true
	default:
		return false
	}
}

// UpdateDeviceToken 更新设备推送Token
// PUT /api/v1/push/devices/:device_id/token
func (h *PushHandler) UpdateDeviceToken(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "")
		return
	}

	deviceID := c.Param("device_id")
	if deviceID == "" {
		response.BadRequest(c, "device_id is required")
		return
	}

	var req struct {
		PushToken string `json:"push_token" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	err := h.pushService.UpdateDeviceToken(c.Request.Context(), deviceID, req.PushToken)
	if err != nil {
		response.InternalServerError(c, "failed to update device token")
		return
	}

	response.SuccessWithMessage(c, "device token updated successfully", nil)
}