package config

import (
	"io"
	"io/ioutil"
	"time"

	"github.com/pkg/errors"

	"gopkg.in/yaml.v2"
)

type Config struct {
	HTTP HTTPConfig `yaml:"http"`
	OIDC OIDCConfig `yaml:"oidc"`
}

// NewFromFile retrieves the configuration from the given file
func NewFromFile(filepath string) (*Config, error) {
	config := NewDefault()

	data, err := ioutil.ReadFile(filepath)
	if err != nil {
		return nil, errors.Wrapf(err, "could not read file '%s'", filepath)
	}

	if err := yaml.Unmarshal(data, config); err != nil {
		return nil, errors.Wrapf(err, "could not unmarshal configuration")
	}

	return config, nil
}

type HTTPConfig struct {
	Address                 string `yaml:"address"`
	CookieAuthenticationKey string `yaml:"cookieAuthenticationKey"`
	CookieEncryptionKey     string `yaml:"cookieEncryptionKey"`
	CookieMaxAge            int    `yaml:"cookieMaxAge"`
	TemplateDir             string `yaml:"templateDir"`
	PublicDir               string `yaml:"publicDir"`
}

type OIDCConfig struct {
	ClientID     string `yaml:"clientId"`
	ClientSecret string `yaml:"clientSecret"`
	IssuerURL    string `ymal:"issuerUrl"`
	RedirectURL  string `yaml:"redirectUrl"`
}

func NewDumpDefault() *Config {
	config := NewDefault()
	return config
}

func NewDefault() *Config {
	return &Config{
		HTTP: HTTPConfig{
			Address:                 ":3002",
			CookieAuthenticationKey: "",
			CookieEncryptionKey:     "",
			CookieMaxAge:            int((time.Hour * 1).Seconds()), // 1 hour
			TemplateDir:             "template",
			PublicDir:               "public",
		},
		OIDC: OIDCConfig{
			IssuerURL:   "http://localhost:4444/",
			RedirectURL: "http://localhost:3002/oauth2/callback",
		},
	}
}

func Dump(config *Config, w io.Writer) error {
	data, err := yaml.Marshal(config)
	if err != nil {
		return errors.Wrap(err, "could not dump config")
	}

	if _, err := w.Write(data); err != nil {
		return err
	}

	return nil
}