package config

import (
	"log"
	"os"
	"strconv"
	"strings"

	"github.com/joho/godotenv"
)

func GetEnv(key string) string {
	_ = godotenv.Load()
	upperKey := strings.ToUpper(key)
	return os.Getenv(upperKey)
}

func SetEnvConf(key string, sub string) {
	envJoin := strings.Join([]string{key, sub}, "_")
	env := GetEnv(envJoin)
	confJoin := strings.Join([]string{key, sub}, ".")
	orig := Get(confJoin)
	if env != "" {
		switch orig.(type) {
		case string:
			Set(confJoin, env)
		case int:
			conv, err := strconv.Atoi(env)
			if err != nil {
				log.Panic("[Config] Error converting string to int: ", err)
			}
			Set(confJoin, conv)
		case bool:
			switch env {
			case "true":
				Set(confJoin, true)
			case "false":
				Set(confJoin, false)
			}
		case []string:
			trim := strings.TrimSpace(env)
			trim = strings.TrimPrefix(trim, "[")
			trim = strings.TrimSuffix(trim, "]")
			var envArray []string
			for _, v := range strings.Split(trim, ",") {
				trimSub := strings.TrimPrefix(v, "\"")
				trimSub = strings.TrimSuffix(trimSub, "\"")
				envArray = append(envArray, trimSub)
			}
			Set(confJoin, envArray)
		}
	}
}

func EnvInit() {
	var dict = map[string][]string{
		"server":   {"address", "debug_mode", "file_logger"},
		"database": {"type", "host", "name", "username", "password"},
	}
	for key, value := range dict {
		for _, sub := range value {
			SetEnvConf(key, sub)
		}
	}
}

func TZ() string {
	tz := GetEnv("TZ")
	if tz == "" {
		return "Asia/Shanghai"
	}
	return tz
}