package notification

import (
	"context"

	"github.com/asaskevich/govalidator"
	"github.com/labstack/echo/v4"

	"tm/internal/customer"
	"tm/internal/user"
	"tm/pkg/response"
)

// NotificationHandler handles HTTP requests for notification operations
type NotificationHandler struct {
	service Service
}

// NewNotificationHandler creates a new notification handler
func NewHandler(service Service) *NotificationHandler {
	return &NotificationHandler{
		service: service,
	}
}

// CreateNotification creates a new notification
// @Summary Create a new notification
// @Description Create a new notification with the provided information
// @Tags Admin-Notification
// @Accept json
// @Produce json
// @Param notification body NotificationRequest true "Notification information"
// @Success 201 {object} response.APIResponse "Notification created successfully"
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security BearerAuth
// @Router /admin/v1/notifications [post]
func (h *NotificationHandler) Send(c echo.Context) error {
	var req NotificationRequest
	if err := c.Bind(&req); err != nil {
		return response.BadRequest(c, "Invalid request format", err.Error())
	}

	// Validate request
	if valid, err := govalidator.ValidateStruct(req); !valid {
		return response.ValidationError(c, "Validation failed", err.Error())
	}

	// Send notification
	go h.service.Send(context.Background(), &req)

	return response.Created(c, nil, "Notification created successfully")
}

// GetNotifications gets notifications
// @Summary Get notifications
// @Description Get notifications
// @Tags Admin-Notification
// @Accept json
// @Produce json
// @Param search query string false "Search query for title and message"
// @Param q query string false "Search query for title and message (alias of search)"
// @Param status query string false "Status filter"
// @Param method query string false "Method filter"
// @Param event_type query string false "Event type filter"
// @Param type query string false "Type filter"
// @Param recipient query string false "Recipient filter"
// @Param user_id query string false "User ID filter"
// @Param seen query bool false "Seen filter"
// @Param priority query string false "Priority filter"
// @Param limit query int false "Limit results"
// @Param offset query int false "Offset results"
// @Param sort_by query string false "Sort field"
// @Param sort_order query string false "Sort order"
// @Success 200 {object} response.APIResponse{data=NotificationListResponse}
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security BearerAuth
// @Router /admin/v1/notifications [get]
func (h *NotificationHandler) GetNotifications(c echo.Context) error {
	form, err := response.Parse[SearchForm](c)
	if err != nil {
		return response.BadRequest(c, "Invalid request format", err.Error())
	}

	// Validate form
	if _, err := govalidator.ValidateStruct(form); err != nil {
		return response.ValidationError(c, err.Error(), "")
	}

	pagination, err := response.NewPagination(c)
	if err != nil {
		return response.PaginationBadRequest(c, err)
	}

	notifications, err := h.service.GetNotifications(c.Request().Context(), form, pagination)
	if err != nil {
		if response.IsListPaginationError(err) {
			return response.PaginationBadRequest(c, err)
		}
		return response.InternalServerError(c, "Failed to get notifications")
	}

	return response.SuccessWithMeta(c, notifications.Notifications, notifications.Meta, "Notifications retrieved successfully")
}

// MyAdminNotifications gets notifications for the admin
// @Summary Get notifications for the admin
// @Description Get notifications for the admin
// @Tags Admin-Notification
// @Accept json
// @Produce json
// @Param status query string false "Status filter"
// @Param method query string false "Method filter"
// @Param event_type query string false "Event type filter"
// @Param type query string false "Type filter"
// @Param recipient query string false "Recipient filter"
// @Param seen query bool false "Seen filter"
// @Param priority query string false "Priority filter"
// @Param limit query int false "Limit results"
// @Param offset query int false "Offset results"
// @Param sort_by query string false "Sort field"
// @Param sort_order query string false "Sort order"
// @Success 200 {object} response.APIResponse{data=NotificationListResponse}
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security BearerAuth
// @Router /admin/v1/notifications/my [get]
func (h *NotificationHandler) AdminNotifications(c echo.Context) error {
	userID, err := user.GetUserIDFromContext(c)
	if err != nil {
		return response.BadRequest(c, "User ID required", "User must be associated with a user")
	}

	form, err := response.Parse[SearchForm](c)
	if err != nil {
		return response.BadRequest(c, "Invalid request format", err.Error())
	}

	// Validate form
	if _, err := govalidator.ValidateStruct(form); err != nil {
		return response.ValidationError(c, err.Error(), "")
	}

	form.Recipient = []string{userID}
	form.Status = "sent"
	form.EventType = EventTypeInApp
	form.Method = ""

	pagination, err := response.NewPagination(c)
	if err != nil {
		return response.PaginationBadRequest(c, err)
	}

	notifications, err := h.service.GetNotifications(c.Request().Context(), form, pagination)
	if err != nil {
		if response.IsListPaginationError(err) {
			return response.PaginationBadRequest(c, err)
		}
		return response.InternalServerError(c, "Failed to get notifications")
	}

	return response.SuccessWithMeta(c, notifications.Notifications, notifications.Meta, "Notifications retrieved successfully")
}

// MarkSeen marks a notification as seen
// @Summary Mark a notification as seen
// @Description Mark a notification as seen
// @Tags Admin-Notification
// @Accept json
// @Produce json
// @Param id path string true "Notification ID"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security BearerAuth
// @Router /admin/v1/notifications/mark-seen/{id} [get]
func (h *NotificationHandler) MarkSeen(c echo.Context) error {
	notificationID := c.Param("id")

	userID, err := user.GetUserIDFromContext(c)
	if err != nil {
		return response.BadRequest(c, "User ID required", "User must be associated with a user")
	}

	// Mark notification as seen
	err = h.service.MarkSeen(c.Request().Context(), notificationID, userID)
	if err != nil {
		return response.InternalServerError(c, "Failed to mark notification as seen")
	}

	return response.Success(c, nil, "Notification marked as seen successfully")
}

// ViewNotification gets a single notification by ID
// @Summary Get notification details
// @Description Get detailed information about a specific notification
// @Tags Admin-Notification
// @Accept json
// @Produce json
// @Param id path string true "Notification ID"
// @Success 200 {object} response.APIResponse{data=NotificationResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security BearerAuth
// @Router /admin/v1/notifications/view/{id} [get]
func (h *NotificationHandler) ViewNotification(c echo.Context) error {
	notificationID := c.Param("id")
	if notificationID == "" {
		return response.BadRequest(c, "notification ID is required", "Notification ID must be provided")
	}

	// Get notification details
	notification, err := h.service.GetNotification(c.Request().Context(), notificationID)
	if err != nil {
		return response.InternalServerError(c, "Failed to get notification details")
	}

	return response.Success(c, notification, "Notification details retrieved successfully")
}

// **************************** PUBLIC ENDPOINTS ****************************

// MyNotifications gets notifications for the user
// @Summary Get notifications for the user
// @Description Get notifications for the user
// @Tags Notification
// @Accept json
// @Produce json
// @Param status query string false "Status filter"
// @Param method query string false "Method filter"
// @Param event_type query string false "Event type filter"
// @Param type query string false "Type filter"
// @Param recipient query string false "Recipient filter"
// @Param seen query bool false "Seen filter"
// @Param priority query string false "Priority filter"
// @Param limit query int false "Limit results"
// @Param offset query int false "Offset results"
// @Param sort_by query string false "Sort field"
// @Param sort_order query string false "Sort order"
// @Success 200 {object} response.APIResponse{data=NotificationListResponse}
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security BearerAuth
// @Router /api/v1/notifications [get]
func (h *NotificationHandler) CustomerNotifications(c echo.Context) error {
	userID, err := customer.GetCustomerIDFromContext(c)
	if err != nil {
		return response.BadRequest(c, "User ID required", "User must be associated with a user")
	}

	form, err := response.Parse[SearchForm](c)
	if err != nil {
		return response.BadRequest(c, "Invalid request format", err.Error())
	}

	// Validate form
	if _, err := govalidator.ValidateStruct(form); err != nil {
		return response.ValidationError(c, err.Error(), "")
	}

	form.Recipient = []string{userID}
	form.Status = "sent"
	form.EventType = EventTypeInApp
	form.Method = ""

	pagination, err := response.NewPagination(c)
	if err != nil {
		return response.PaginationBadRequest(c, err)
	}

	notifications, err := h.service.GetNotifications(c.Request().Context(), form, pagination)
	if err != nil {
		if response.IsListPaginationError(err) {
			return response.PaginationBadRequest(c, err)
		}
		c.Logger().Error("GetNotifications failed", map[string]interface{}{
			"error":     err.Error(),
			"status":    form.Status,
			"priority":  form.Priority,
			"eventType": form.EventType,
			"recipient": form.Recipient,
			"limit":     pagination.Limit,
			"offset":    pagination.Offset,
			"page":      (pagination.Offset / pagination.Limit) + 1,
		})
		return response.InternalServerError(c, "Failed to get notifications")
	}

	return response.SuccessWithMeta(c, notifications.Notifications, notifications.Meta, "Notifications retrieved successfully")
}

// MarkSeen marks a notification as seen
// @Summary Mark a notification as seen
// @Description Mark a notification as seen
// @Tags Notification
// @Accept json
// @Produce json
// @Param id path string true "Notification ID"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security BearerAuth
// @Router /api/v1/notifications/mark/{id} [get]
func (h *NotificationHandler) PublicMarkSeen(c echo.Context) error {
	notificationID := c.Param("id")

	userID, err := customer.GetCustomerIDFromContext(c)
	if err != nil {
		return response.BadRequest(c, "User ID required", "User must be associated with a user")
	}

	// Mark notification as seen
	err = h.service.MarkSeen(c.Request().Context(), notificationID, userID)
	if err != nil {
		return response.InternalServerError(c, "Failed to mark notification as seen")
	}

	return response.Success(c, nil, "Notification marked as seen successfully")
}

// AllMarkSeen marks all notifications as seen for a user
// @Summary Mark all notifications as seen for a user
// @Description Mark all notifications as seen for a user
// @Tags Notification
// @Accept json
// @Produce json
// @Param user_id path string true "User ID"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security BearerAuth
// @Router /api/v1/notifications/mark [get]
func (h *NotificationHandler) PublicAllMarkSeen(c echo.Context) error {
	userID, err := customer.GetCustomerIDFromContext(c)
	if err != nil {
		return response.BadRequest(c, "user ID is required", "User ID must be provided")
	}

	// Mark all notifications as seen
	err = h.service.AllMarkSeen(c.Request().Context(), userID)
	if err != nil {
		return response.InternalServerError(c, "Failed to mark all notifications as seen")
	}

	return response.Success(c, nil, "All notifications marked as seen successfully")
}

// ViewNotification gets a single notification by ID
// @Summary Get notification details
// @Description Get detailed information about a specific notification
// @Tags Notification
// @Accept json
// @Produce json
// @Param id path string true "Notification ID"
// @Success 200 {object} response.APIResponse{data=DetailedNotificationResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Security BearerAuth
// @Router /api/v1/notifications/view/{id} [get]
func (h *NotificationHandler) PublicViewNotification(c echo.Context) error {
	notificationID := c.Param("id")
	if notificationID == "" {
		return response.BadRequest(c, "notification ID is required", "Notification ID must be provided")
	}

	// Get notification details
	notification, err := h.service.GetNotification(c.Request().Context(), notificationID)
	if err != nil {
		return response.InternalServerError(c, "Failed to get notification details")
	}

	return response.Success(c, notification, "Notification details retrieved successfully")
}