package daemon

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

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

// 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}
}

// CreateNetworkRequest contains the arguments to the CreateNetwork RPC method.
//
// All fields are required.
type CreateNetworkRequest struct {
	// Human-readable name of the network.
	Name string

	// Primary domain name that network services are served under.
	Domain string

	// An IP subnet, in CIDR form, which will be the overall range of possible
	// IPs in the network. The first IP in this network range will become this
	// first host's IP.
	IPNet nebula.IPNet

	// The name of this first host in the network.
	HostName nebula.HostName
}

// CreateNetwork passes through to the Daemon method of the same name.
func (r *RPC) CreateNetwork(
	ctx context.Context, req CreateNetworkRequest,
) (
	admin.Admin, error,
) {
	return r.daemon.CreateNetwork(
		ctx, req.Name, req.Domain, req.IPNet, req.HostName,
	)
}

// JoinNetwork passes through to the Daemon method of the same name.
func (r *RPC) JoinNetwork(
	ctx context.Context, req bootstrap.Bootstrap,
) (
	struct{}, error,
) {
	return struct{}{}, r.daemon.JoinNetwork(ctx, req)
}

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

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

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

	return GetHostsResult{hosts}, nil
}

// GetGarageClientParams returns a GarageClientParams which can be used to
// interact with garage.
func (r *RPC) GetGarageClientParams(
	ctx context.Context, req struct{},
) (
	bootstrap.GarageClientParams, error,
) {
	b, err := r.daemon.GetBootstrap(ctx)
	if err != nil {
		return bootstrap.GarageClientParams{}, fmt.Errorf(
			"retrieving bootstrap: %w", err,
		)
	}

	return b.GarageClientParams(), nil
}

// GetNebulaCAPublicCredentials returns the CAPublicCredentials for the network.
func (r *RPC) GetNebulaCAPublicCredentials(
	ctx context.Context, req struct{},
) (
	nebula.CAPublicCredentials, error,
) {
	b, err := r.daemon.GetBootstrap(ctx)
	if err != nil {
		return nebula.CAPublicCredentials{}, fmt.Errorf(
			"retrieving bootstrap: %w", err,
		)
	}

	return b.CAPublicCredentials, nil
}

// RemoveHostRequest contains the arguments to the RemoveHost RPC method.
//
// All fields are required.
type RemoveHostRequest struct {
	HostName nebula.HostName
}

// RemoveHost passes the call through to the Daemon method of the same name.
func (r *RPC) RemoveHost(ctx context.Context, req RemoveHostRequest) (struct{}, error) {
	return struct{}{}, r.daemon.RemoveHost(ctx, req.HostName)
}

// CreateNebulaCertificateRequest contains the arguments to the
// CreateNebulaCertificate RPC method.
//
// All fields are required.
type CreateNebulaCertificateRequest struct {
	CASigningPrivateKey     nebula.SigningPrivateKey // TODO load from secrets storage
	HostName                nebula.HostName
	HostEncryptingPublicKey nebula.EncryptingPublicKey
}

// CreateNebulaCertificateResult wraps the results from the
// CreateNebulaCertificate RPC method.
type CreateNebulaCertificateResult struct {
	HostNebulaCertifcate nebula.Certificate
}

// CreateNebulaCertificate passes the call through to the Daemon method of the
// same name.
func (r *RPC) CreateNebulaCertificate(
	ctx context.Context, req CreateNebulaCertificateRequest,
) (
	CreateNebulaCertificateResult, error,
) {
	cert, err := r.daemon.CreateNebulaCertificate(
		ctx, req.CASigningPrivateKey, req.HostName, req.HostEncryptingPublicKey,
	)
	if err != nil {
		return CreateNebulaCertificateResult{}, err
	}

	return CreateNebulaCertificateResult{
		HostNebulaCertifcate: cert,
	}, nil
}