package cmd

import (
	"fmt"
	"log"
	"log/slog"
	"math/rand"
	"os"
	"strings"
	"time"

	"git.bloy.org/mike/hasshelper/web"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var cfgFile string

var rootCmd = &cobra.Command{
	Use:   "hasshelper",
	Short: "Helper for Home Assistant installations.",
	Run:   rootCmdRun,
}

func logLevelVar(str string) slog.Level {
	levelUpper := strings.ToUpper(str)
	switch levelUpper {
	case "DEBUG":
		return slog.LevelDebug
	case "INFO":
		return slog.LevelInfo
	case "WARN":
		return slog.LevelWarn
	case "ERROR":
		return slog.LevelError
	default:
		return slog.LevelInfo
	}
}

func rootCmdRun(cmd *cobra.Command, args []string) {
	logLevel := logLevelVar(viper.GetString("loglevel"))
	logger := slog.New(slog.NewTextHandler(os.Stdout,
		&slog.HandlerOptions{Level: logLevel}))
	logger.Info("HASSHelper startup", "version", viper.GetString("version"))
	exitchan := make(chan bool)
	web.Run(logger, exitchan)
	<-exitchan // run the main command until one of the goroutines is done
}

// Execute will kick off cobra's processing of the root command
func Execute() {
	if err := rootCmd.Execute(); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

func init() {
	rootCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c", "",
		"config file (default is $HOME/.config/hasshelper/config.toml)")
	cobra.OnInitialize(initConfig)
	const dirName = "hasshelper"
	var userConfigDir, err = os.UserConfigDir()
	if err == nil {
		viper.AddConfigPath(
			fmt.Sprintf("%s%c%s", userConfigDir, os.PathSeparator, dirName))
	} else {
		log.Println("could not locate user config dir:", err)
	}
	viper.AddConfigPath(fmt.Sprintf("/etc%c%s", os.PathSeparator, dirName))
	viper.SetConfigName("config.toml")
	viper.SetEnvPrefix("hasshelper")
}

func initConfig() {
	viper.Set("version", gitVersion)
	viper.SetDefault("deployment", "prod")
	viper.SetDefault("loglevel", "info")
	viper.AutomaticEnv()
	if cfgFile != "" {
		viper.SetConfigFile(cfgFile)
	}
	if err := viper.ReadInConfig(); err != nil {
		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
			log.Printf("no config file found. Environment only")
		} else {
			log.Fatalf("error reading config file: %v\n", err)
		}
	}
	expected_config := []string{
		"deployment",
		"image_dir",
		"version",
		"webserver_port",
	}
	for _, key := range expected_config {
		if !viper.IsSet(key) {
			fmt.Fprintf(os.Stderr, "Missing configuration value: %s\n", key)
			os.Exit(1)
		}
	}
	rand.Seed(time.Now().UnixNano())
}