package notification

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

	"tm/pkg/logger"
	"tm/pkg/response"
)

// NotificationHandler handles HTTP requests for notification operations
type NotificationHandler struct {
	service NotificationService
	logger  logger.Logger
}

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

// 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
// @Router /admin/v1/notifications [post]
func (h *NotificationHandler) Create(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())
	}

	// Create notification
	resp, err := h.service.Create(c.Request().Context(), &req)
	if err != nil {
		return response.InternalServerError(c, "Failed to create notification")
	}

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

// UpdateNotification updates a notification
// @Summary Update notification
// @Description Update an existing notification
// @Tags Admin-Notification
// @Accept json
// @Produce json
// @Param id path string true "Notification ID"
// @Param notification body NotificationRequest true "Updated notification information"
// @Success 200 {object} response.APIResponse "Notification updated successfully"
// @Failure 400 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/v1/notifications/{id} [put]
func (h *NotificationHandler) UpdateNotification(c echo.Context) error {
	id := c.Param("id")
	if id == "" {
		return response.BadRequest(c, "Notification ID is required", "")
	}

	var req NotificationRequest
	if err := c.Bind(&req); err != nil {
		return response.BadRequest(c, "Invalid request format", err.Error())
	}

	// Update notification
	_, err := h.service.Update(c.Request().Context(), id, &req)
	if err != nil {
		if err.Error() == "notification not found" {
			return response.NotFound(c, "Notification not found")
		}
		return response.BadRequest(c, "Failed to update notification", err.Error())
	}

	return response.Success(c, nil, "Notification updated successfully")
}

// GetNotifications retrieves notifications for a user
// @Summary Get user notifications
// @Description Retrieve notifications for a specific user with filtering and pagination
// @Tags Admin-Notification
// @Accept json
// @Produce json
// @Param recipient query string true "Recipient"
// @Param type query string false "Notification type (info, warning, alert, reject)"
// @Param priority query string false "Notification priority (low, medium, important)"
// @Param status query string false "Delivery status (pending, sent, failed)"
// @Param is_read query bool false "Read status"
// @Param page query int false "Page number" default(1)
// @Param limit query int false "Items per page" default(20)
// @Param sort_by query string false "Sort field" default(created_at)
// @Param sort_order query string false "Sort order (asc, desc)" default(desc)
// @Success 200 {object} response.APIResponse{data=NotificationsResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/v1/notifications [get]
func (h *NotificationHandler) Search(c echo.Context) error {
	req, err := response.Parse[SearchForm](c)
	if err != nil {
		return response.ValidationError(c, "Invalid request data", err.Error())
	}

	pagination := response.NewPagination(c)

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

	// Get notifications
	resp, err := h.service.Search(c.Request().Context(), req, pagination)
	if err != nil {
		return response.InternalServerError(c, "Failed to get notifications")
	}

	return response.Success(c, resp, "Notifications retrieved successfully")
}

// Get retrieves a notification by ID
// @Summary Get notification by ID
// @Description Retrieve a specific notification by its ID
// @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
// @Router /admin/v1/notifications/{id} [get]
func (h *NotificationHandler) Get(c echo.Context) error {
	id := c.Param("id")
	if id == "" {
		return response.BadRequest(c, "Notification ID is required", "")
	}

	// Get notification
	resp, err := h.service.Get(c.Request().Context(), id)
	if err != nil {
		if err.Error() == "notification not found" {
			return response.NotFound(c, "Notification not found")
		}
		return response.InternalServerError(c, "Failed to get notification")
	}

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

// DeleteNotification deletes a notification
// @Summary Delete notification
// @Description Delete a specific notification
// @Tags Admin-Notification
// @Accept json
// @Produce json
// @Param id path string true "Notification ID"
// @Success 200 {object} response.APIResponse "Notification deleted successfully"
// @Failure 400 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/v1/notifications/{id} [delete]
func (h *NotificationHandler) DeleteNotification(c echo.Context) error {
	id := c.Param("id")
	if id == "" {
		return response.BadRequest(c, "Notification ID is required", "")
	}

	// Delete notification
	err := h.service.Delete(c.Request().Context(), id)
	if err != nil {
		return response.InternalServerError(c, "Failed to delete notification")
	}

	return response.Success(c, nil, "Notification deleted successfully")
}