package daemon

import (
	"cmp"
	"context"
	"fmt"
	"isle/bootstrap"
	"slices"

	"golang.org/x/exp/maps"
)

// GetHostsResult wraps the results from the GetHosts RPC method.
type GetHostsResult struct {
	Hosts []bootstrap.Host
}

// RPC exposes all RPC methods which are available to be called over the RPC
// interface.
type RPC struct {
	daemon Daemon
}

// NewRPC initializes and returns an RPC instance.
func NewRPC(daemon Daemon) *RPC {
	return &RPC{daemon}
}

// GetHosts returns all hosts known to the cluster, sorted by their name.
func (r *RPC) GetHosts(
	ctx context.Context, req struct{},
) (
	GetHostsResult, error,
) {
	hostsMap, err := r.daemon.GetGarageBootstrapHosts(ctx)
	if err != nil {
		return GetHostsResult{}, fmt.Errorf("retrieving hosts: %w", err)
	}

	hosts := maps.Values(hostsMap)
	slices.SortFunc(hosts, func(a, b bootstrap.Host) int {
		return cmp.Compare(a.Name, b.Name)
	})

	return GetHostsResult{hosts}, nil
}