package config

import (
	"os"
	"strconv"
	"strings"
)

type Config struct {
	ServerPort         string
	DatabasePath       string
	TechnitiumURL      string
	TechnitiumUsername string
	TechnitiumPassword string
	TechnitiumToken    string
	BaseDomain         string
	SpaceSubdomain     string
	RateLimitPerIP     int
	RateLimitPerToken  int
	TrustedProxies     []string
}

func Load() *Config {
	cfg := &Config{
		ServerPort:         getEnv("SERVER_PORT", "8080"),
		DatabasePath:       getEnv("DATABASE_PATH", "./dyn.db"),
		TechnitiumURL:      getEnv("TECHNITIUM_URL", ""),
		TechnitiumUsername: getEnv("TECHNITIUM_USERNAME", ""),
		TechnitiumPassword: getEnv("TECHNITIUM_PASSWORD", ""),
		TechnitiumToken:    getEnv("TECHNITIUM_TOKEN", ""),
		BaseDomain:         getEnv("BASE_DOMAIN", "dws.rip"),
		SpaceSubdomain:     getEnv("SPACE_SUBDOMAIN", "space"),
		RateLimitPerIP:     getEnvAsInt("RATE_LIMIT_PER_IP", 10),
		RateLimitPerToken:  getEnvAsInt("RATE_LIMIT_PER_TOKEN", 1),
		TrustedProxies:     getEnvAsSlice("TRUSTED_PROXIES", []string{}),
	}

	return cfg
}

func (c *Config) Validate() []string {
	var errors []string

	if c.TechnitiumURL == "" {
		errors = append(errors, "TECHNITIUM_URL is required")
	}

	if c.TechnitiumToken == "" && (c.TechnitiumUsername == "" || c.TechnitiumPassword == "") {
		errors = append(errors, "Either TECHNITIUM_TOKEN or TECHNITIUM_USERNAME/PASSWORD must be provided")
	}

	return errors
}

func (c *Config) GetZone() string {
	if c.SpaceSubdomain == "" {
		return c.BaseDomain
	}
	return c.SpaceSubdomain + "." + c.BaseDomain
}

func getEnv(key, defaultValue string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return defaultValue
}

func getEnvAsInt(key string, defaultValue int) int {
	if value := os.Getenv(key); value != "" {
		if intVal, err := strconv.Atoi(value); err == nil {
			return intVal
		}
	}
	return defaultValue
}

func getEnvAsSlice(key string, defaultValue []string) []string {
	if value := os.Getenv(key); value != "" {
		return strings.Split(value, ",")
	}
	return defaultValue
}