package config

import (
	"io/fs"
	"net/url"
	"path/filepath"
	"time"

	"go.alanpearce.eu/x/log"

	"github.com/BurntSushi/toml"
	"gitlab.com/tozd/go/errors"
)

type Taxonomy struct {
	Name string
	Feed bool
}

type MenuItem struct {
	Name string
	URL  URL `toml:"url"`
}

type URL struct {
	*url.URL
}

func NewURL(rawURL string) URL {
	u, err := url.Parse(rawURL)
	if err != nil {
		panic(err)
	}

	return URL{u}
}

func (u *URL) UnmarshalText(text []byte) (err error) {
	u.URL, err = url.Parse(string(text))

	return errors.WithMessagef(err, "could not parse URL %s", string(text))
}

type Timezone struct {
	*time.Location
}

func (t *Timezone) UnmarshalText(text []byte) (err error) {
	t.Location, err = time.LoadLocation(string(text))

	return errors.WithMessagef(err, "could not parse timezone %s", string(text))
}

type Config struct {
	Title       string
	Email       string
	Description string

	BaseURL         URL    `toml:"base_url"`
	OriginalDomain  string `toml:"original_domain"`
	DomainStartDate string `toml:"domain_start_date"`
	GoatCounter     URL    `toml:"goatcounter"`
	OIDCHost        URL    `toml:"oidc_host"`

	Domains        []string
	WildcardDomain string `toml:"wildcard_domain"`

	Language string
	Timezone Timezone

	Taxonomies []Taxonomy
	Menu       []MenuItem
	RelMe      []MenuItem `toml:"rel_me"`
}

func GetConfig(dir string, log *log.Logger) (*Config, errors.E) {
	config := &Config{}
	filename := filepath.Join(dir, "config.toml")
	log.Debug("reading config", "filename", filename)
	_, err := toml.DecodeFile(filename, config)
	if err != nil {
		switch t := err.(type) {
		case *fs.PathError:
			return nil, errors.WithMessage(t, "could not read configuration")
		case *toml.ParseError:
			return nil, errors.WithMessage(t, t.ErrorWithUsage())
		}

		return nil, errors.WithMessage(err, "config error")
	}

	return config, nil
}