package cmd

import (
	"fmt"
	"log"
	"os"
	"strings"

	"git.bloy.org/mike/hasshelper/web"
	"github.com/rs/zerolog"
	"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 rootCmdRun(cmd *cobra.Command, args []string) {
	logLevel, err := zerolog.ParseLevel(viper.GetString("loglevel"))
	zerolog.SetGlobalLevel(logLevel)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
	var logger zerolog.Logger
	if viper.GetString("deployment") == "prod" {
		logger = zerolog.New(os.Stderr)
	} else {
		logger = zerolog.New(zerolog.ConsoleWriter{
			Out:         os.Stdout,
			FormatLevel: func(i interface{}) string { return strings.ToUpper(fmt.Sprintf("%-6s|", i)) },
		})
	}
	logger = logger.With().Timestamp().Caller().Logger()
	logger.Info().Str("version", viper.GetString("version")).Msg("HASSHelper startup")
	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")
	viper.Set("version", gitVersion)
	viper.SetDefault("deployment", "prod")
	viper.SetDefault("loglevel", "info")
}

func initConfig() {
	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)
		}
	}
}