package config

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

	"github.com/pkg/errors"

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

type Config struct {
	Debug   bool          `yaml:"debug"`
	HTTP    HTTPConfig    `yaml:"http"`
	SMTP    SMTPConfig    `yaml:"smtp"`
	Hydra   HydraConfig   `yaml:"hydra"`
	Session SessionConfig `yaml:"session"`
	Sentry  SentryConfig  `yaml:"sentry"`
}

// 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"`
	BaseURL                 string `yaml:"basePublicUrl"  env:"HTTP_BASE_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"`
}

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"`
	// Fake upstream SSL termination adding the "X-Forwarded-Proto: https" to the OIDC client
	// HTTP request headers.
	// Required by ory/hydra in some networks topologies
	FakeSSLTermination bool          `yaml:"fakeSSLTermination" env:"HYDRA_FAKE_SSL_TERMINATION"`
	HTTPClientTimeout  time.Duration `yaml:"httpClientTimeout" env:"HYDRA_HTTP_CLIENT_TIMEOUT"`
}

type SessionConfig struct {
	DefaultDuration    int `yaml:"defaultDuration" env:"HYDRA_SESSION_DEFAULT_DURATION"`
	RememberMeDuration int `yaml:"rememberMeDuration" env:"HYDRA_SESSION_REMEMBER_ME_DURATION"`
}

type SentryConfig struct {
	DSN string `yaml:"dsn" env:"SENTRY_DSN"`
	// Server events sampling rate, see https://docs.sentry.io/platforms/go/configuration/options/
	ServerSampleRate   float64       `yaml:"serverSampleRate" env:"SENTRY_SERVER_SAMPLE_RATE"`
	ServerFlushTimeout time.Duration `yaml:"serverFlushTimeout" env:"SENTRY_SERVER_FLUSH_TIMEOUT"`
	Environment        string        `yaml:"environment" env:"SENTRY_ENVIRONMENT"`
}

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

func NewDefault() *Config {
	return &Config{
		Debug: false,
		HTTP: HTTPConfig{
			Address:                 ":3000",
			CookieAuthenticationKey: "",
			CookieEncryptionKey:     "",
			TokenEncryptionKey:      "",
			TokenSigningKey:         "",
			CookieMaxAge:            int((time.Hour * 1).Seconds()), // 1 hour
			TemplateDir:             "template",
			PublicDir:               "public",
			BaseURL:                 "/",
		},
		SMTP: SMTPConfig{
			Host:          "localhost",
			Port:          2525,
			User:          "",
			Password:      "",
			SenderAddress: "noreply@localhost",
			SenderName:    "noreply",
		},
		Hydra: HydraConfig{
			BaseURL:            "http://localhost:4445/",
			FakeSSLTermination: false,
			HTTPClientTimeout:  time.Second * 30, //nolint: gomnb
		},
		Session: SessionConfig{
			DefaultDuration:    int((time.Hour * 1).Seconds()),       // 1 hour
			RememberMeDuration: int((time.Hour * 24 * 30).Seconds()), // 30 days
		},
		Sentry: SentryConfig{
			DSN:                "",
			ServerSampleRate:   1,
			ServerFlushTimeout: 2 * time.Second,
			Environment:        "",
		},
	}
}

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
}