package cfg

import (
	"fmt"
	"os"

	"github.com/alecthomas/kong"
)

type AppSettings struct {
	GrafanaURL   string
	GrafanaToken string
	GitBranch    string
	GitRepoURL   string
	GitUser      string
	GitEmail     string
	GitPass      string
	GPGKey       string
}

var cliStruct struct {
	GrafanaURL   string `name:"grafana-url" env:"GRAFANA_URL" help:"Grafana URL to access the API"`
	GrafanaToken string `name:"grafana-auth-token" env:"GRAFANA_AUTH_TOKEN" help:"Grafana auth token to access the API"`
	GitBranch    string `name:"git-branch" env:"GIT_BRANCH" help:"Git branch name" default:"${default_git_branch}"`
	GitRepoURL   string `name:"git-repo-url" env:"GIT_REPO_URL" help:"Complete Git repository URL"`
	GitUser      string `name:"git-user" env:"GIT_USER" help:"Git username"`
	GitEmail     string `name:"git-email" env:"GIT_EMAIL" help:"Git email address"`
	GitPass      string `name:"git-pass" env:"GIT_PASS" help:"Git password"`
	GPGKey       string `name:"signing-key" env:"GIT_SIGNING_KEY" help:"GPG signing key"`
}

func Parse() *AppSettings {
	ctx := kong.Parse(
		&cliStruct,
		kong.Vars{
			"default_git_branch": "main",
		},
		kong.Name("grafana-backuper"),
		kong.Description("🚀 CLI tool to convert grafana dashboards to git"),
		kong.UsageOnError(),
	)

	validateFlags(ctx)
	settings := &AppSettings{
		GrafanaURL:   cliStruct.GrafanaURL,
		GrafanaToken: cliStruct.GrafanaToken,
		GitBranch:    cliStruct.GitBranch,
		GitRepoURL:   cliStruct.GitRepoURL,
		GitUser:      cliStruct.GitUser,
		GitEmail:     cliStruct.GitEmail,
		GitPass:      cliStruct.GitPass,
		GPGKey:       cliStruct.GPGKey,
	}
	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.GrafanaToken == "" {
		messages = append(messages, "error: invalid auth token for grafana, must not be blank")
		flagsValid = false
	}
	if cliStruct.GitRepoURL == "" {
		messages = append(messages, "error: invalid repo url for git, must not be blank")
		flagsValid = false
	}
	if cliStruct.GitUser == "" {
		messages = append(messages, "error: invalid username for git, must not be blank")
		flagsValid = false
	}
	if cliStruct.GitPass == "" {
		messages = append(messages, "error: invalid password for git, 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)
	}
}