package root

import (
	"github.com/MakeNowJust/heredoc"
	"github.com/spf13/cobra"
)

func NewHelpTopic(topic string) *cobra.Command {
	topicContent := make(map[string]string)

	topicContent["environment"] = heredoc.Doc(`
		GITHUB_TOKEN: an authentication token for github.com API requests. Setting this avoids
		being prompted to authenticate and takes precedence over previously stored credentials.

		GITHUB_ENTERPRISE_TOKEN: an authentication token for API requests to GitHub Enterprise.

		GH_REPO: specify the GitHub repository in the "[HOST/]OWNER/REPO" format for commands
		that otherwise operate on a local repository.

		GH_HOST: specify the GitHub hostname for commands that would otherwise assume
		the "github.com" host when not in a context of an existing repository.

		GH_EDITOR, GIT_EDITOR, VISUAL, EDITOR (in order of precedence): the editor tool to use
		for authoring text.

		BROWSER: the web browser to use for opening links.

		DEBUG: set to any value to enable verbose output to standard error. Include values "api"
		or "oauth" to print detailed information about HTTP requests or authentication flow.

		GH_PAGER, PAGER (in order of precedence): a terminal paging program to send standard output to, e.g. "less".

		GLAMOUR_STYLE: the style to use for rendering Markdown. See
		https://github.com/charmbracelet/glamour#styles

		NO_COLOR: set to any value to avoid printing ANSI escape sequences for color output.

		CLICOLOR: set to "0" to disable printing ANSI colors in output.

		CLICOLOR_FORCE: set to a value other than "0" to keep ANSI colors in output
		even when the output is piped.

		GH_NO_UPDATE_NOTIFIER: set to any value to disable update notifications. By default, gh
		checks for new releases once every 24 hours and displays an upgrade notice on standard
		error if a newer version was found.
	`)

	cmd := &cobra.Command{
		Use:    topic,
		Long:   topicContent[topic],
		Hidden: true,
		Args:   cobra.NoArgs,
		Run:    helpTopicHelpFunc,
	}

	cmd.SetHelpFunc(helpTopicHelpFunc)
	cmd.SetUsageFunc(helpTopicUsageFunc)

	return cmd
}

func helpTopicHelpFunc(command *cobra.Command, args []string) {
	command.Print(command.Long)
}

func helpTopicUsageFunc(command *cobra.Command) error {
	command.Printf("Usage: gh help %s", command.Use)
	return nil
}