package config

import (
	"io"

	ini "gopkg.in/ini.v1"
)

// Config is the config
type Config struct {
	HTTP HTTPConfig
	LDAP LDAPConfig
}

// HTTPConfig is the http config
type HTTPConfig struct {
	Address string
	Secret  string
}

// LDAPConfig is the ldap config
type LDAPConfig struct {
	Base         string
	Host         string
	Port         int
	BindDN       string
	BindPassword string
	UserFilter   string
	Attributes   []string
}

// NewFromFile retrieves the configuration from the given file
func NewFromFile(filepath string) (*Config, error) {
	config := NewDefault()
	cfg, err := ini.Load(filepath)
	if err != nil {
		return nil, err
	}
	if err := cfg.MapTo(config); err != nil {
		return nil, err
	}
	return config, nil
}

// NewDefault set a default config
func NewDefault() *Config {
	return &Config{
		HTTP: HTTPConfig{
			Address: ":3001",
		},
		LDAP: LDAPConfig{
			Base:         "dc=example,dc=com",
			Host:         "ldap.example.com",
			Port:         389,
			BindDN:       "uid=readonlysuer,ou=People,dc=example,dc=com",
			BindPassword: "readonlypassword",
			UserFilter:   "(uid=%s)",
			Attributes:   []string{"givenName", "sn", "mail", "uid"},
		},
	}
}

// Dump return the config dump
func Dump(config *Config, w io.Writer) error {
	cfg := ini.Empty()
	if err := cfg.ReflectFrom(config); err != nil {
		return err
	}
	if _, err := cfg.WriteTo(w); err != nil {
		return err
	}
	return nil
}