package netboxapi

import (
	"context"

	e "git.stinnesbeck.com/nils/errorhandler"
	"github.com/netbox-community/go-netbox/v3/netbox/client/ipam"
	"github.com/netbox-community/go-netbox/v3/netbox/models"
)

// GetPrefixes returns prefixes from the api filtered by the parameter list param
func (nb NetBoxAPI) GetPrefixes(param ipam.IpamPrefixesListParams) ([]*models.Prefix, 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 prefixes
	prefixes, err := nb.API.Ipam.IpamPrefixesList(&param, nil)
	if err != nil {
		return nil, e.FormatError("can't get prefixes", err)
	}

	// check if there are more prefixes on other pages
	if prefixes.Payload.Next == nil {
    // return the results of the first batch, there are no others
		return prefixes.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.GetPrefixes(param)
	if err != nil {
		return nil, e.FormatError("can't get prefixes", err)
	}

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

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

// GetIPAddresses returns IP addresses from the api filtered by the parameter list param
func (nb NetBoxAPI) GetIPAddresses(param ipam.IpamIPAddressesListParams) ([]*models.IPAddress, 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 addresses
	addresses, err := nb.API.Ipam.IpamIPAddressesList(&param, nil)
	if err != nil {
		return nil, e.FormatError("can't get prefixes", err)
	}

	// check if there are no more prefixes on other pages
	if addresses.Payload.Next == nil {
		// return the results of the first batch, there are no others
		return addresses.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
	nextPageIPAddresses, err := nb.GetIPAddresses(param)
	if err != nil {
		return nil, e.FormatError("can't get IP addresses", err)
	}

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

	// return all addresses
	return addresses.Payload.Results, nil
}