/*
Copyright (c) Edgeless Systems GmbH

SPDX-License-Identifier: AGPL-3.0-only
*/

/*
Package cmd is the entrypoint of the Constellation CLI.

Business logic of the CLI shall be implemented in the internal/cmd package.
*/
package cmd

import (
	"context"
	"fmt"
	"os"
	"os/signal"

	"github.com/edgelesssys/constellation/v2/cli/internal/cmd"
	"github.com/spf13/cobra"
)

// Execute starts the CLI.
func Execute() error {
	cobra.EnableCommandSorting = false
	rootCmd := NewRootCmd()
	ctx, cancel := signalContext(context.Background(), os.Interrupt)
	defer cancel()
	return rootCmd.ExecuteContext(ctx)
}

// NewRootCmd creates the root command.
func NewRootCmd() *cobra.Command {
	rootCmd := &cobra.Command{
		Use:               "constellation",
		Short:             "Manage your Constellation cluster",
		Long:              "Manage your Constellation cluster.",
		PersistentPreRunE: preRunRoot,
	}

	// Set output of cmd.Print to stdout. (By default, it's stderr.)
	rootCmd.SetOut(os.Stdout)

	rootCmd.PersistentFlags().StringP("workspace", "C", "", "path to the Constellation workspace")
	rootCmd.PersistentFlags().Bool("debug", false, "enable debug logging")
	rootCmd.PersistentFlags().Bool("force", false, "disable version compatibility checks - might result in corrupted clusters")
	rootCmd.PersistentFlags().String("tf-log", "NONE", "Terraform log level")

	must(rootCmd.MarkPersistentFlagDirname("workspace"))

	rootCmd.AddCommand(cmd.NewConfigCmd())
	rootCmd.AddCommand(cmd.NewCreateCmd())
	rootCmd.AddCommand(cmd.NewApplyCmd())
	rootCmd.AddCommand(cmd.NewMiniCmd())
	rootCmd.AddCommand(cmd.NewStatusCmd())
	rootCmd.AddCommand(cmd.NewVerifyCmd())
	rootCmd.AddCommand(cmd.NewUpgradeCmd())
	rootCmd.AddCommand(cmd.NewRecoverCmd())
	rootCmd.AddCommand(cmd.NewTerminateCmd())
	rootCmd.AddCommand(cmd.NewIAMCmd())
	rootCmd.AddCommand(cmd.NewVersionCmd())
	rootCmd.AddCommand(cmd.NewInitCmd())

	return rootCmd
}

// signalContext returns a context that is canceled on the handed signal.
// The signal isn't watched after its first occurrence. Call the cancel
// function to ensure the internal goroutine is stopped and the signal isn't
// watched any longer.
func signalContext(ctx context.Context, sig os.Signal) (context.Context, context.CancelFunc) {
	sigCtx, stop := signal.NotifyContext(ctx, sig)
	done := make(chan struct{}, 1)
	stopDone := make(chan struct{}, 1)

	go func() {
		defer func() { stopDone <- struct{}{} }()
		defer stop()
		select {
		case <-sigCtx.Done():
			fmt.Println(" Signal caught. Press ctrl+c again to terminate the program immediately.")
		case <-done:
		}
	}()

	cancelFunc := func() {
		done <- struct{}{}
		<-stopDone
	}

	return sigCtx, cancelFunc
}

func preRunRoot(cmd *cobra.Command, _ []string) error {
	cmd.SilenceUsage = true

	workspace, err := cmd.Flags().GetString("workspace")
	if err != nil {
		return fmt.Errorf("getting workspace flag: %w", err)
	}

	// Change to workspace directory if set.
	if workspace != "" {
		if err := os.Chdir(workspace); err != nil {
			return fmt.Errorf("changing from current directory to workspace %q: %w", workspace, err)
		}
	}

	return nil
}

func must(err error) {
	if err != nil {
		panic(err)
	}
}