package main

import (
	"html/template"
	"log"
	"os"
	"path/filepath"

	"gopkg.in/yaml.v2"
)

func init() {
	loadEnvConfig()
	loadYAMLConfig()
	loadTemplate()
}

func loadEnvConfig() {
	requiredEnvVars := []string{
		"LDAP_SERVER", "LDAP_PORT", "LDAP_BIND_DN", "LDAP_BIND_PASSWORD",
		"LDAP_BASE_DN", "LDAP_FILTER", "SERVER_PORT",
	}

	for _, envVar := range requiredEnvVars {
		if value := os.Getenv(envVar); value == "" {
			log.Fatalf("Required environment variable %s is not set", envVar)
		}
	}

	ldapConfig = LDAPConfig{
		Server:       os.Getenv("LDAP_SERVER"),
		Port:         os.Getenv("LDAP_PORT"),
		BindDN:       os.Getenv("LDAP_BIND_DN"),
		BindPassword: os.Getenv("LDAP_BIND_PASSWORD"),
		BaseDN:       os.Getenv("LDAP_BASE_DN"),
		Filter:       os.Getenv("LDAP_FILTER"),
	}

	serverPort = os.Getenv("SERVER_PORT")
}

func loadYAMLConfig() {
	configPath := filepath.Join("static", "config.yaml")
	configFile, err := os.ReadFile(configPath)
	if err != nil {
		log.Fatalf("Failed to read config file: %v", err)
	}

	err = yaml.Unmarshal(configFile, &config)
	if err != nil {
		log.Fatalf("Failed to parse config file: %v", err)
	}

	validateConfig()
}

func validateConfig() {
	if config.PhoneRules.Country.Prefix == "" ||
		len(config.PhoneRules.Country.AreaCodes) == 0 ||
		config.PhoneRules.Country.InternalPrefix == "" ||
		config.PhoneRules.InvalidNumber == "" {
		log.Fatalf("Missing required configuration in config.yaml")
	}
}

func loadTemplate() {
	var err error
	tmpl, err = template.ParseFiles(filepath.Join("static", "index.html"))
	if err != nil {
		log.Fatalf("Failed to parse template: %v", err)
	}
}