package main

import (
	"mime"
	"os"
	"text/template"

	"github.com/pelletier/go-toml"
)

// Config contains site configuration.
type Config struct {
	Title      string              `toml:"title"`      // site title
	URLs       []string            `toml:"urls"`       // site URLs
	Feeds      map[string]string   `toml:"feeds"`      // site feeds
	Mediatypes map[string][]string `toml:"mediatypes"` // mediatypes
	Templates  *Templates          `toml:"-"`          // site templates
}

// LoadConfig loads the configuration from the provided path.
func LoadConfig(path string) (*Config, error) {
	c := new(Config)
	f, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	if err := toml.NewDecoder(f).Decode(c); err != nil {
		return nil, err
	}

	// Register media types
	for typ, exts := range c.Mediatypes {
		for _, ext := range exts {
			mime.AddExtensionType(typ, ext)
		}
	}

	return c, nil
}

// LoadTemplates loads templates from the provided path.
func (c *Config) LoadTemplates(path string) error {
	// Site contains site metadata passed to templates
	type Site struct {
		Title string
		URLs  []string
	}

	// Load templates
	c.Templates = NewTemplates()
	c.Templates.Funcs(template.FuncMap{
		"site": func() Site {
			return Site{
				Title: c.Title,
				URLs:  c.URLs,
			}
		},
	})
	c.Templates.LoadDefault()
	return c.Templates.Load(path)
}