/*
   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 (
	"os"

	"github.com/spf13/cobra"
)

func completionCommand() *cobra.Command {
	return &cobra.Command{
		Use:   "completion [bash|zsh|fish|powershell]",
		Short: "Generate completion script",
		Long: `To load completions:

Bash:

  $ source <(docker compose completion bash)

  # To load completions for each session, execute once:
  # Linux:
  $ docker compose completion bash > /etc/bash_completion.d/docker_compose
  # macOS:
  $ docker compose completion bash > /usr/local/etc/bash_completion.d/docker_compose

Zsh:

  # If shell completion is not already enabled in your environment,
  # you will need to enable it.  You can execute the following once:

  $ echo "autoload -U compinit; compinit" >> ~/.zshrc

  # To load completions for each session, execute once:
  $ docker compose completion zsh > "${fpath[1]}/_docker_compose"

  # You will need to start a new shell for this setup to take effect.

fish:

  $ docker compose completion fish | source

  # To load completions for each session, execute once:
  $ docker compose completion fish > ~/.config/fish/completions/docker_compose.fish

PowerShell:

  PS> docker compose completion powershell | Out-String | Invoke-Expression

  # To load completions for every new session, run:
  PS> docker compose completion powershell > docker_compose.ps1
  # and source this file from your PowerShell profile.
`,
		DisableFlagsInUseLine: true,
		ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
		Args:                  cobra.ExactValidArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			var err error
			switch args[0] {
			case "bash":
				err = cmd.Root().GenBashCompletion(os.Stdout)
			case "zsh":
				err = cmd.Root().GenZshCompletion(os.Stdout)
			case "fish":
				err = cmd.Root().GenFishCompletion(os.Stdout, true)
			case "powershell":
				err = cmd.Root().GenPowerShellCompletion(os.Stdout)
			}
			return err
		},
	}
}