package config

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

	"github.com/pkg/errors"

	"github.com/caarlos0/env/v6"
	"gopkg.in/yaml.v2"
)

type Config struct {
	HTTP  HTTPConfig  `yaml:"http"`
	SMTP  SMTPConfig  `yaml:"smtp"`
	Hydra HydraConfig `yaml:"hydra"`
}

// 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" env:"HTTP_ADDRESS"`
	CookieAuthenticationKey string `yaml:"cookieAuthenticationKey" env:"HTTP_COOKIE_AUTHENTICATION_KEY"`
	CookieEncryptionKey     string `yaml:"cookieEncryptionKey" env:"HTTP_COOKIE_ENCRYPTION_KEY"`
	TokenSigningKey         string `yaml:"tokenSigningKey" env:"HTTP_TOKEN_SIGNING_KEY"`
	TokenEncryptionKey      string `yaml:"tokenEncryptionKey"  env:"HTTP_TOKEN_ENCRYPTION_KEY"`
	BasePublicURL           string `yaml:"basePublicUrl"  env:"HTTP_BASE_PUBLIC_URL"`
	CookieMaxAge            int    `yaml:"cookieMaxAge"  env:"HTTP_COOKIE_MAX_AGE"`
	TemplateDir             string `yaml:"templateDir"  env:"HTTP_TEMPLATE_DIR"`
	PublicDir               string `yaml:"publicDir"  env:"HTTP_PUBLIC_DIR"`
	PublicAddress           string `yaml:"publicAddress"  env:"HTTP_PUBLIC_ADDRESS"`
	PublicScheme            string `yaml:"publicScheme"  env:"HTTP_PUBLIC_SCHEME"`
}

type SMTPConfig struct {
	Host               string `yaml:"host"  env:"SMTP_HOST"`
	Port               int    `yaml:"port" env:"SMTP_PORT"`
	UseStartTLS        bool   `yaml:"useStartTLS" env:"SMTP_USE_START_TLS"`
	User               string `yaml:"user" env:"SMTP_USER"`
	Password           string `yaml:"password" env:"SMTP_PASSWORD"`
	InsecureSkipVerify bool   `yaml:"insecureSkipVerify" env:"SMTP_INSECURE_SKIP_VERIFY"`
	SenderAddress      string `yaml:"senderAddress" env:"SMTP_SENDER_ADDRESS"`
	SenderName         string `yaml:"senderName" env:"SMTP_SENDER_NAME"`
}

type HydraConfig struct {
	BaseURL string `yaml:"baseURL" env:"HYDRA_BASE_URL"`
}

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

func NewDefault() *Config {
	return &Config{
		HTTP: HTTPConfig{
			Address:                 ":3000",
			CookieAuthenticationKey: "",
			CookieEncryptionKey:     "",
			TokenEncryptionKey:      "",
			TokenSigningKey:         "",
			CookieMaxAge:            int((time.Hour * 1).Seconds()), // 1 hour
			TemplateDir:             "template",
			PublicDir:               "public",
			PublicAddress:           "",
			PublicScheme:            "",
		},
		SMTP: SMTPConfig{
			Host:          "localhost",
			Port:          2525,
			User:          "hydra-passwordless",
			Password:      "hydra-passwordless",
			SenderAddress: "noreply@localhost",
			SenderName:    "noreply",
		},
		Hydra: HydraConfig{
			BaseURL: "http://localhost:4445/",
		},
	}
}

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
}

func WithEnvironment(conf *Config) error {
	if err := env.Parse(conf); err != nil {
		return err
	}

	return nil
}