package config

import (
	"fmt"
	"os"

	"gopkg.in/yaml.v3"
)

// Config represents the proxy configuration
type Config struct {
	Listen struct {
		Address string `yaml:"address"`
		Port    int    `yaml:"port"`
	} `yaml:"listen"`
	Mappings []struct {
		External string `yaml:"external"`
		Internal string `yaml:"internal"`
		Port     int    `yaml:"port"` // Optional, defaults to listen port
	} `yaml:"mappings"`
	Debug bool `yaml:"debug"`
}

// loadConfig loads configuration from YAML file
func LoadConfig(configPath string) (*Config, error) {
	data, err := os.ReadFile(configPath)
	if err != nil {
		return nil, fmt.Errorf("failed to read config file: %w", err)
	}

	var config Config
	if err := yaml.Unmarshal(data, &config); err != nil {
		return nil, fmt.Errorf("failed to parse config file: %w", err)
	}

	return &config, nil
}