package config

import "os"

// dirFunc is a type of parsing function which processes
// a particular directive and populates the config.
type dirFunc func(*parser) error

// validDirectives is a map of valid directive names to
// their parsing function.
var validDirectives map[string]dirFunc

func init() {
	// This has to be in the init function
	// to avoid an initialization loop error because
	// the 'import' directive (key) in this map
	// invokes a method that uses this map.
	validDirectives = map[string]dirFunc{
		"root": func(p *parser) error {
			if !p.nextArg() {
				return p.argErr()
			}
			p.cfg.Root = p.tkn()
			return nil
		},
		"import": func(p *parser) error {
			if !p.nextArg() {
				return p.argErr()
			}

			filename := p.tkn()
			file, err := os.Open(filename)
			if err != nil {
				return p.err("Parse", err.Error())
			}
			defer file.Close()
			p2, err := newParser(file)
			if err != nil {
				return p.err("Parse", "Could not import "+filename+"; "+err.Error())
			}

			p2.cfg = p.cfg
			err = p2.directives()
			if err != nil {
				return err
			}
			p.cfg = p2.cfg

			return nil
		},
		"tls": func(p *parser) error {
			tls := TLSConfig{Enabled: true}

			if !p.nextArg() {
				return p.argErr()
			}
			tls.Certificate = p.tkn()

			if !p.nextArg() {
				return p.argErr()
			}
			tls.Key = p.tkn()

			p.cfg.TLS = tls
			return nil
		},
	}
}