package config

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

	"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 (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 Config struct {
	DefaultLanguage  string `toml:"default_language"`
	BaseURL          URL    `toml:"base_url"`
	InjectLiveReload bool
	Title            string
	Email            string
	Description      string
	DomainStartDate  string `toml:"domain_start_date"`
	OriginalDomain   string `toml:"original_domain"`
	GoatCounter      URL    `toml:"goatcounter"`
	Domains          []string
	WildcardDomain   string `toml:"wildcard_domain"`
	OIDCHost         URL    `toml:"oidc_host"`
	Taxonomies       []Taxonomy
	CSP              *CSP `toml:"content-security-policy"`
	Extra            struct {
		Headers map[string]string
	}
	Menus map[string][]MenuItem
}

func GetConfig(dir string, log *log.Logger) (*Config, error) {
	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
}