package bootstrap

import (
	"errors"
	"path/filepath"

	"github.com/caarlos0/env/v9"
	"github.com/mitchellh/go-homedir"
	log "github.com/sirupsen/logrus"

	"github.com/synctv-org/synctv/cmd/flags"
	"github.com/synctv-org/synctv/internal/conf"
	"github.com/synctv-org/synctv/utils"
)

func InitConfig() {
	if flags.SkipConfig && flags.SkipEnv {
		log.Fatal("skip config and skip env at the same time")
		return
	}
	conf.Conf = conf.DefaultConfig()
	if !flags.SkipConfig {
		if flags.ConfigFile == "" {
			homeDir, err := homedir.Dir()
			if err != nil {
				log.Fatalf("find home dir error: %v", err)
			}
			flags.ConfigFile = filepath.Join(homeDir, ".config", "synctv", "config.yaml")
		} else {
			fileAbs, err := filepath.Abs(flags.ConfigFile)
			if err != nil {
				log.Fatalf("get config file abs path error: %v", err)
			}
			flags.ConfigFile = fileAbs
		}
		err := confFromConfig(flags.ConfigFile, conf.Conf)
		if err != nil {
			log.Fatalf("load config from file error: %v", err)
		}
		log.Infof("load config success from file: %s", flags.ConfigFile)
		if err = restoreConfig(flags.ConfigFile, conf.Conf); err != nil {
			log.Warnf("restore config error: %v", err)
		} else {
			log.Info("restore config success")
		}
	}
	if !flags.SkipEnv {
		prefix := "SYNCTV_"
		if flags.EnvNoPrefix {
			prefix = ""
			log.Info("load config from env without prefix")
		} else {
			log.Infof("load config from env with prefix: %s", prefix)
		}
		err := confFromEnv(prefix, conf.Conf)
		if err != nil {
			log.Fatalf("load config from env error: %v", err)
		}
		log.Info("load config success from env")
	}
}

func confFromConfig(filePath string, conf *conf.Config) error {
	if filePath == "" {
		return errors.New("config file path is empty")
	}
	if !utils.Exists(filePath) {
		log.Infof("config file not exists, create new config file: %s", filePath)
		err := conf.Save(filePath)
		if err != nil {
			return err
		}
	} else {
		err := utils.ReadYaml(filePath, conf)
		if err != nil {
			return err
		}
	}
	return nil
}

func restoreConfig(filePath string, conf *conf.Config) error {
	if filePath == "" {
		return errors.New("config file path is empty")
	}
	return conf.Save(filePath)
}

func confFromEnv(prefix string, conf *conf.Config) error {
	return env.ParseWithOptions(conf, env.Options{
		Prefix: prefix,
	})
}