package cfg

import (
	"fmt"
	"os"

	"github.com/alecthomas/kong"
)

type AppSettings struct {
	GrafanaURL string
	Token      string
}

var cliStruct struct {
	GrafanaURL string `name:"grafana-url" env:"GRAFANA_URL" help:"Grafana URL to access the API"`
	AuthToken  string `name:"grafana-auth-token" env:"GRAFANA_AUTH_TOKEN" help:"Grafana auth token to access the API"`
}

func Parse() *AppSettings {
	ctx := kong.Parse(
		&cliStruct,
		kong.Name("grafana-backuper"),
		kong.Description("🚀 CLI tool to backup grafana dashboards"),
		kong.UsageOnError(),
	)

	validateFlags(ctx)
	settings := &AppSettings{
		GrafanaURL: cliStruct.GrafanaURL,
		Token:      cliStruct.AuthToken,
	}
	return settings
}

func validateFlags(cliCtx *kong.Context) {
	var flagsValid = true
	var messages = []string{}
	if cliStruct.GrafanaURL == "" {
		messages = append(messages, "error: invalid grafana URL, must not be blank")
		flagsValid = false
	}
	if cliStruct.AuthToken == "" {
		messages = append(messages, "error: invalid auth token for grafana, must not be blank")
		flagsValid = false
	}
	if !flagsValid {
		cliCtx.PrintUsage(false)
		fmt.Println()
		for i := 0; i < len(messages); i++ {
			fmt.Println(messages[i])
		}
		os.Exit(1)
	}
}