package config

import (
	"io"
	"os"

	ini "gopkg.in/ini.v1"
)

type Config struct {
	Debug bool
	HTTP  HTTPConfig
	Gitea GiteaConfig
	Data  DataConfig
}

type HTTPConfig struct {
	Address   string
	PublicDir string
}

type GiteaConfig struct {
	ClientID     string
	ClientSecret string
	RedirectURL  string
	LogoutURL    string
	AuthURL      string
	TokenURL     string
	Scopes       []string
	APIBaseURL   string
}

type DataConfig struct {
	DBPath 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
	}

	cfg.ValueMapper = os.ExpandEnv

	if err := cfg.MapTo(config); err != nil {
		return nil, err
	}

	return config, nil
}

func NewDefault() *Config {
	return &Config{
		Debug: false,
		HTTP: HTTPConfig{
			Address:   ":3000",
			PublicDir: "${GENGITKAN_HTTP_PUBDIR}",
		},
		Gitea: GiteaConfig{},
		Data: DataConfig{
			DBPath: "${GENGITKAN_DATA_DBPATH}",
		},
	}
}

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
}