package config

import (
	"encoding/json"
	"strings"

	"gitlab.com/mbugroup/lti-api.git/internal/utils"

	"github.com/spf13/viper"
)

var (
	IsProd               bool
	AppHost              string
	Version              string
	LogLevel             string
	AppPort              int
	DBHost               string
	DBUser               string
	DBPassword           string
	DBName               string
	DBPort               int
	JWTSecret            string
	JWTAccessExp         int
	JWTRefreshExp        int
	JWTResetPasswordExp  int
	JWTVerifyEmailExp    int
	RedisURL             string
	CORSAllowOrigins     []string
	CORSAllowMethods     []string
	CORSAllowHeaders     []string
	CORSExposeHeaders    []string
	CORSAllowCredentials bool
	CORSMaxAge           int
)

func init() {
	loadConfig()

	// server configuration
	IsProd = viper.GetString("APP_ENV") == "prod"
	AppHost = viper.GetString("APP_HOST")
	AppPort = viper.GetInt("APP_PORT")
	Version = viper.GetString("VERSION")
	LogLevel = viper.GetString("LOG_LEVEL")

	// database configuration
	DBHost = viper.GetString("DB_HOST")
	DBUser = viper.GetString("DB_USER")
	DBPassword = viper.GetString("DB_PASSWORD")
	DBName = viper.GetString("DB_NAME")
	DBPort = viper.GetInt("DB_PORT")

	// jwt configuration
	JWTSecret = viper.GetString("JWT_SECRET")
	JWTAccessExp = viper.GetInt("JWT_ACCESS_EXP_MINUTES")
	JWTRefreshExp = viper.GetInt("JWT_REFRESH_EXP_DAYS")
	JWTResetPasswordExp = viper.GetInt("JWT_RESET_PASSWORD_EXP_MINUTES")
	JWTVerifyEmailExp = viper.GetInt("JWT_VERIFY_EMAIL_EXP_MINUTES")

	//Cors
	CORSAllowOrigins = parseList("CORS_ALLOW_ORIGINS")
	CORSAllowMethods = parseListWithDefault("CORS_ALLOW_METHODS", "GET,POST,PUT,PATCH,DELETE,OPTIONS")
	CORSAllowHeaders = parseListWithDefault("CORS_ALLOW_HEADERS", "Content-Type,Authorization,X-Requested-With")
	CORSExposeHeaders = parseList("CORS_EXPOSE_HEADERS")
	CORSAllowCredentials = viper.GetBool("CORS_ALLOW_CREDENTIALS")
	CORSMaxAge = viper.GetInt("CORS_MAX_AGE")

	// Redis
	RedisURL = viper.GetString("REDIS_URL")
}

func loadConfig() {
	viper.AutomaticEnv()

	viper.SetConfigFile(".env")
	if err := viper.ReadInConfig(); err == nil {
		utils.Log.Info("Config file loaded from .env")
	} else {
		utils.Log.Warn("No .env file found, using environment variables only")
	}
}

func parseList(key string) []string {
	raw := strings.TrimSpace(viper.GetString(key))
	if raw == "" {
		return nil
	}
	if strings.HasPrefix(raw, "[") {
		var arr []string
		if json.Unmarshal([]byte(raw), &arr) == nil {
			for i := range arr {
				arr[i] = strings.TrimSpace(arr[i])
			}
			return arr
		}
	}
	parts := strings.Split(raw, ",")
	out := make([]string, 0, len(parts))
	for _, p := range parts {
		p = strings.TrimSpace(p)
		if p != "" {
			out = append(out, p)
		}
	}
	return out
}

func parseListWithDefault(key, def string) []string {
	if v := parseList(key); len(v) > 0 {
		return v
	}
	// fallback ke default CSV
	parts := strings.Split(def, ",")
	for i := range parts {
		parts[i] = strings.TrimSpace(parts[i])
	}
	return parts
}