package command

import (
	"flag"
	"fmt"
	"strings"

	"github.com/hashicorp/consul/command/agent"
	"github.com/mitchellh/cli"
)

// ConfigTestCommand is a Command implementation that is used to
// verify config files
type ConfigTestCommand struct {
	Ui cli.Ui
}

func (c *ConfigTestCommand) Help() string {
	helpText := `
Usage: consul configtest [options]

  Tests that config files are valid by attempting to parse them. Useful to ensure a configuration change will not cause consul to fail after a restart.

Options:

  -config-file=foo         Path to a JSON file to read configuration from.
                           This can be specified multiple times.
  -config-dir=foo          Path to a directory to read configuration files
                           from. This will read every file ending in ".json"
                           as configuration in this directory in alphabetical
                           order.
	`
	return strings.TrimSpace(helpText)
}

func (c *ConfigTestCommand) Run(args []string) int {
	var configFiles []string
	cmdFlags := flag.NewFlagSet("configtest", flag.ContinueOnError)
	cmdFlags.Usage = func() { c.Ui.Output(c.Help()) }
	cmdFlags.Var((*agent.AppendSliceValue)(&configFiles), "config-file", "json file to read config from")
	cmdFlags.Var((*agent.AppendSliceValue)(&configFiles), "config-dir", "directory of json files to read")
	if err := cmdFlags.Parse(args); err != nil {
		return 1
	}

	if len(configFiles) <= 0 {
		c.Ui.Error("Must specify config using -config-file or -config-dir")
		return 1
	}

	_, err := agent.ReadConfigPaths(configFiles)
	if err != nil {
		c.Ui.Error(fmt.Sprintf("Config validation failed: %v", err.Error()))
		return 1
	}
	return 0
}

func (c *ConfigTestCommand) Synopsis() string {
	return "Validate config file"
}