package main

import (
	"fmt"
	"gopkg.in/yaml.v3"
	"os"
)

type ServerConfig struct {
	Port int `yaml:"port"`
}

func (s *ServerConfig) Addr() string {
	ip := "0.0.0.0"
	return fmt.Sprintf("%s:%d", ip, s.Port)
}

type MySQLConfig struct {
	Host     string `yaml:"host"`
	Port     int    `yaml:"port"`
	User     string `yaml:"user"`
	Password string `yaml:"password"`
	DBName   string `yaml:"dbname"`
}

// DSN returns the Data Source Name for connecting to the MySQL database
// with UTF8 encoding and the local timezone.
func (m *MySQLConfig) DSN() string {
	return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8&parseTime=True&loc=Local", m.User, m.Password, m.Host, m.Port, m.DBName)
}

type Config struct {
	Server ServerConfig `yaml:"server"`
	MySQL  MySQLConfig  `yaml:"mysql"`
}

// LoadConfig parses the configuration file and returns a Config instance
func LoadConfig(filePath string) (*Config, error) {
	file, err := os.Open(filePath)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	config := &Config{}
	decoder := yaml.NewDecoder(file)
	if err := decoder.Decode(config); err != nil {
		return nil, err
	}

	return config, nil
}