package config

import (
	"io"

	ini "gopkg.in/ini.v1"
)

type Config struct {
	HTTP HTTPConfig
	LDAP LDAPConfig
}

type HTTPConfig struct {
	Address     string
	TemplateDir string
	PublicDir   string
}

type LDAPConfig struct {
	URL                     string
	BaseDN                  string
	UserSearchFilterPattern string
	EditableAttributes      []string `ini:",allowshadow"`
}

// 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
}

func NewDefault() *Config {
	return &Config{
		HTTP: HTTPConfig{
			Address:     ":3000",
			TemplateDir: "./templates",
			PublicDir:   "./public",
		},
		LDAP: LDAPConfig{
			URL:                     "ldap://127.0.0.1:389",
			BaseDN:                  "o=org,c=fr",
			UserSearchFilterPattern: "(&(objectClass=person)(uid=%s))",
			EditableAttributes: []string{
				"displayname",
				"mail",
			},
		},
	}
}

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
}