package main

import (
	"context"
	"errors"
	"fmt"
	"isle/bootstrap"
	"isle/daemon"
	"isle/daemon/jsonrpc2"
	"isle/garage/garagesrv"
	"net"
	"net/http"

	"dev.mediocregopher.com/mediocre-go-lib.git/mctx"
	"dev.mediocregopher.com/mediocre-go-lib.git/mlog"
)

func coalesceDaemonConfigAndBootstrap(
	hostBootstrap bootstrap.Bootstrap, daemonConfig daemon.Config,
) (
	bootstrap.Bootstrap, error,
) {
	host := bootstrap.Host{
		HostAssigned: hostBootstrap.HostAssigned,
		HostConfigured: bootstrap.HostConfigured{
			Nebula: bootstrap.NebulaHost{
				PublicAddr: daemonConfig.VPN.PublicAddr,
			},
		},
	}

	if allocs := daemonConfig.Storage.Allocations; len(allocs) > 0 {

		for i, alloc := range allocs {

			id, rpcPort, err := garagesrv.InitAlloc(alloc.MetaPath, alloc.RPCPort)
			if err != nil {
				return bootstrap.Bootstrap{}, fmt.Errorf(
					"initializing alloc at %q: %w", alloc.MetaPath, err,
				)
			}

			host.Garage.Instances = append(host.Garage.Instances, bootstrap.GarageHostInstance{
				ID:        id,
				RPCPort:   rpcPort,
				S3APIPort: alloc.S3APIPort,
			})

			allocs[i].RPCPort = rpcPort
		}
	}

	hostBootstrap.Hosts[host.Name] = host

	if err := writeBootstrapToStateDir(hostBootstrap); err != nil {
		return bootstrap.Bootstrap{}, fmt.Errorf("writing bootstrap file: %w", err)
	}

	return hostBootstrap, nil
}

const daemonHTTPRPCPath = "/rpc/v0.json"

func newHTTPServer(
	ctx context.Context, logger *mlog.Logger, rpc *daemon.RPC,
) (
	*http.Server, error,
) {
	socketPath := daemon.HTTPSocketPath()
	l, err := net.Listen("unix", socketPath)
	if err != nil {
		return nil, fmt.Errorf(
			"failed to listen on socket %q: %w", socketPath, err,
		)
	}

	ctx = mctx.Annotate(ctx, "httpAddr", l.Addr().String())
	logger.Info(ctx, "HTTP server socket created")

	rpcHandler := jsonrpc2.Chain(
		jsonrpc2.NewMLogMiddleware(logger.WithNamespace("rpc")),
		jsonrpc2.ExposeServerSideErrorsMiddleware,
	)(
		jsonrpc2.NewDispatchHandler(&rpc),
	)

	httpMux := http.NewServeMux()
	httpMux.Handle(daemonHTTPRPCPath, jsonrpc2.NewHTTPHandler(rpcHandler))

	srv := &http.Server{Handler: httpMux}

	go func() {
		if err := srv.Serve(l); !errors.Is(err, http.ErrServerClosed) {
			logger.Fatal(ctx, "HTTP server unexpectedly shut down", err)
		}
	}()

	return srv, nil
}