package cmd

import (
	"context"
	"io"
	"io/ioutil"
	"net"
	"net/http"
	"net/url"
	"os"
	"time"

	"github.com/spf13/cobra"
	"golang.org/x/xerrors"

	"cdr.dev/slog"
	"cdr.dev/slog/sloggers/sloghuman"
	"github.com/coder/coder/coderd"
	"github.com/coder/coder/codersdk"
	"github.com/coder/coder/database"
	"github.com/coder/coder/database/databasefake"
	"github.com/coder/coder/provisioner/terraform"
	"github.com/coder/coder/provisionerd"
	"github.com/coder/coder/provisionersdk"
	"github.com/coder/coder/provisionersdk/proto"
)

func Root() *cobra.Command {
	var (
		address string
	)
	root := &cobra.Command{
		Use: "coderd",
		RunE: func(cmd *cobra.Command, args []string) error {
			logger := slog.Make(sloghuman.Sink(os.Stderr))
			handler := coderd.New(&coderd.Options{
				Logger:   logger,
				Database: databasefake.New(),
				Pubsub:   database.NewPubsubInMemory(),
			})

			listener, err := net.Listen("tcp", address)
			if err != nil {
				return xerrors.Errorf("listen %q: %w", address, err)
			}
			defer listener.Close()

			client := codersdk.New(&url.URL{
				Scheme: "http",
				Host:   address,
			})
			closer, err := newProvisionerDaemon(cmd.Context(), client, logger)
			if err != nil {
				return xerrors.Errorf("create provisioner daemon: %w", err)
			}
			defer closer.Close()

			errCh := make(chan error)
			go func() {
				defer close(errCh)
				errCh <- http.Serve(listener, handler)
			}()

			select {
			case <-cmd.Context().Done():
				return cmd.Context().Err()
			case err := <-errCh:
				return err
			}
		},
	}
	defaultAddress, ok := os.LookupEnv("ADDRESS")
	if !ok {
		defaultAddress = "127.0.0.1:3000"
	}
	root.Flags().StringVarP(&address, "address", "a", defaultAddress, "The address to serve the API and dashboard.")

	return root
}

func newProvisionerDaemon(ctx context.Context, client *codersdk.Client, logger slog.Logger) (io.Closer, error) {
	terraformClient, terraformServer := provisionersdk.TransportPipe()
	go func() {
		err := terraform.Serve(ctx, &terraform.ServeOptions{
			ServeOptions: &provisionersdk.ServeOptions{
				Listener: terraformServer,
			},
			Logger: logger,
		})
		if err != nil {
			panic(err)
		}
	}()
	tempDir, err := ioutil.TempDir("", "provisionerd")
	if err != nil {
		return nil, err
	}
	return provisionerd.New(client.ProvisionerDaemonClient, &provisionerd.Options{
		Logger:         logger,
		PollInterval:   50 * time.Millisecond,
		UpdateInterval: 50 * time.Millisecond,
		Provisioners: provisionerd.Provisioners{
			string(database.ProvisionerTypeTerraform): proto.NewDRPCProvisionerClient(provisionersdk.Conn(terraformClient)),
		},
		WorkDirectory: tempDir,
	}), nil
}