package netboxapi

import (
	"context"

	"github.com/netbox-community/go-netbox/v3/netbox/client/dcim"
	"github.com/netbox-community/go-netbox/v3/netbox/models"
)

// GetDevices returns devices from the api nb filtered by the parameter list param
func (nb NetBoxAPI) GetDevices(param dcim.DcimDevicesListParams) ([]*models.DeviceWithConfigContext, error) {
	// check if context was set, if not set background
	if param.Context == nil {
		param.Context = context.Background()
	}

	var defaultOffset int64
	var defaultLimit int64 = 50

	// set Offset if not set before
	if param.Limit == nil {
		param.Limit = &defaultLimit
	}

	// set Offset if not set before
	if param.Offset == nil {
		param.Offset = &defaultOffset
	}

	// get devices
	devices, err := nb.API.Dcim.DcimDevicesList(&param, nil)
	if err != nil {
		return nil, err
	}

	// check if there are more prefixes on other pages
	if devices.Payload.Next == nil {
		// return the results of the first batch, there are no others
		return devices.Payload.Results, nil
	}

	// there are more pages to get

	// calculate new offset
	newOffset := *param.Offset + *param.Limit

	// set new offset
	param.Offset = &newOffset

	// get prefixes from next page
	nextPagePrefixes, err := nb.GetDevices(param)
	if err != nil {
		return nil, err
	}

	// append the results from next page to our prefixes to return
	devices.Payload.Results = append(devices.Payload.Results, nextPagePrefixes...)

	// return all prefixes
	return devices.Payload.Results, nil
}