package entrypoint

import (
	"bytes"
	"context"
	crypticnet "cryptic-net"
	"cryptic-net/bootstrap"
	"fmt"
	"io"
	"os"
	"path/filepath"

	"github.com/cryptic-io/pmux/pmuxlib"
)

func copyBootstrapToDataDirAndReload(env crypticnet.Env, r io.Reader) (crypticnet.Env, error) {

	path := env.DataDirBootstrapPath()
	dirPath := filepath.Dir(path)

	if err := os.MkdirAll(dirPath, 0700); err != nil {
		return crypticnet.Env{}, fmt.Errorf("creating directory %q: %w", dirPath, err)
	}

	f, err := os.Create(path)
	if err != nil {
		return crypticnet.Env{}, fmt.Errorf("creating file %q: %w", path, err)
	}

	_, err = io.Copy(f, r)
	f.Close()

	if err != nil {
		return crypticnet.Env{}, fmt.Errorf("copying bootstrap file to %q: %w", path, err)
	}

	return env.LoadBootstrap(path)
}

func mergeDaemonIntoBootstrap(env crypticnet.Env) (crypticnet.Env, error) {
	daemon := env.ThisDaemon()
	host := env.Bootstrap.ThisHost()

	host.Nebula.PublicAddr = daemon.VPN.PublicAddr

	host.Garage = nil

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

		host.Garage = new(bootstrap.GarageHost)

		for _, alloc := range allocs {
			host.Garage.Instances = append(host.Garage.Instances, bootstrap.GarageHostInstance{
				RPCPort:   alloc.RPCPort,
				S3APIPort: alloc.S3APIPort,
			})
		}
	}

	env.Bootstrap.Hosts[host.Name] = host

	buf := new(bytes.Buffer)
	if err := env.Bootstrap.WithHosts(env.Bootstrap.Hosts).WriteTo(buf); err != nil {
		return crypticnet.Env{}, fmt.Errorf("writing new bootstrap file to buffer: %w", err)
	}

	return copyBootstrapToDataDirAndReload(env, buf)
}

func doOnce(ctx context.Context, fn func(context.Context) error) error {
	for {
		if err := fn(ctx); err == nil {
			return nil
		} else if ctxErr := ctx.Err(); ctxErr != nil {
			return ctxErr
		}
	}
}

func waitForNebulaArgs(env crypticnet.Env, args ...string) []string {
	thisHost := env.Bootstrap.ThisHost()
	return append([]string{"wait-for-ip", thisHost.Nebula.IP}, args...)
}

func nebulaEntrypointPmuxProcConfig() pmuxlib.ProcessConfig {
	return pmuxlib.ProcessConfig{
		Name: "nebula",
		Cmd:  "cryptic-net-main",
		Args: []string{
			"nebula-entrypoint",
		},
	}
}