/*
   Copyright 2020 Docker Compose CLI authors

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package compose

import (
	"context"

	"github.com/compose-spec/compose-go/v2/types"
	"github.com/docker/cli/cli"
	"github.com/docker/cli/cli/command"
	"github.com/docker/compose/v2/pkg/api"
	"github.com/docker/compose/v2/pkg/compose"
	"github.com/spf13/cobra"
)

type execOpts struct {
	*composeOptions

	service     string
	command     []string
	environment []string
	workingDir  string

	noTty       bool
	user        string
	detach      bool
	index       int
	privileged  bool
	interactive bool
}

func execCommand(p *ProjectOptions, dockerCli command.Cli, backend api.Service) *cobra.Command {
	opts := execOpts{
		composeOptions: &composeOptions{
			ProjectOptions: p,
		},
	}
	runCmd := &cobra.Command{
		Use:   "exec [OPTIONS] SERVICE COMMAND [ARGS...]",
		Short: "Execute a command in a running container",
		Args:  cobra.MinimumNArgs(2),
		PreRunE: Adapt(func(ctx context.Context, args []string) error {
			opts.service = args[0]
			opts.command = args[1:]
			return nil
		}),
		RunE: Adapt(func(ctx context.Context, args []string) error {
			return runExec(ctx, dockerCli, backend, opts)
		}),
		ValidArgsFunction: completeServiceNames(dockerCli, p),
	}

	runCmd.Flags().BoolVarP(&opts.detach, "detach", "d", false, "Detached mode: Run command in the background")
	runCmd.Flags().StringArrayVarP(&opts.environment, "env", "e", []string{}, "Set environment variables")
	runCmd.Flags().IntVar(&opts.index, "index", 0, "Index of the container if service has multiple replicas")
	runCmd.Flags().BoolVarP(&opts.privileged, "privileged", "", false, "Give extended privileges to the process")
	runCmd.Flags().StringVarP(&opts.user, "user", "u", "", "Run the command as this user")
	runCmd.Flags().BoolVarP(&opts.noTty, "no-TTY", "T", !dockerCli.Out().IsTerminal(), "Disable pseudo-TTY allocation. By default `docker compose exec` allocates a TTY.")
	runCmd.Flags().StringVarP(&opts.workingDir, "workdir", "w", "", "Path to workdir directory for this command")

	runCmd.Flags().BoolVarP(&opts.interactive, "interactive", "i", true, "Keep STDIN open even if not attached")
	runCmd.Flags().MarkHidden("interactive") //nolint:errcheck
	runCmd.Flags().BoolP("tty", "t", true, "Allocate a pseudo-TTY")
	runCmd.Flags().MarkHidden("tty") //nolint:errcheck

	runCmd.Flags().SetInterspersed(false)
	return runCmd
}

func runExec(ctx context.Context, dockerCli command.Cli, backend api.Service, opts execOpts) error {
	projectName, err := opts.toProjectName(ctx, dockerCli)
	if err != nil {
		return err
	}
	projectOptions, err := opts.composeOptions.toProjectOptions()
	if err != nil {
		return err
	}
	lookupFn := func(k string) (string, bool) {
		v, ok := projectOptions.Environment[k]
		return v, ok
	}
	execOpts := api.RunOptions{
		Service:     opts.service,
		Command:     opts.command,
		Environment: compose.ToMobyEnv(types.NewMappingWithEquals(opts.environment).Resolve(lookupFn)),
		Tty:         !opts.noTty,
		User:        opts.user,
		Privileged:  opts.privileged,
		Index:       opts.index,
		Detach:      opts.detach,
		WorkingDir:  opts.workingDir,
		Interactive: opts.interactive,
	}

	exitCode, err := backend.Exec(ctx, projectName, execOpts)
	if exitCode != 0 {
		errMsg := ""
		if err != nil {
			errMsg = err.Error()
		}
		return cli.StatusError{StatusCode: exitCode, Status: errMsg}
	}
	return err
}
