package saccharine

import (
	"fmt"

	"git.maximhutz.com/max/lambda/pkg/token"
)

// A TokenType is an identifier for any token in the Saccharine language.
type TokenType int

// All official tokens of the Saccharine language.
const (
	// TokenOpenParen denotes the '(' token.
	TokenOpenParen TokenType = iota
	// TokenCloseParen denotes the ')' token.
	TokenCloseParen
	// TokenOpenBrace denotes the '{' token.
	TokenOpenBrace
	// TokenCloseBrace denotes the '}' token.
	TokenCloseBrace
	// TokenHardBreak denotes the ';' token.
	TokenHardBreak
	// TokenAssign denotes the ':=' token.
	TokenAssign
	// TokenAtom denotes an alpha-numeric variable.
	TokenAtom
	// TokenSlash denotes the '\\' token.
	TokenSlash
	// TokenDot denotes the '.' token.
	TokenDot
	// TokenSoftBreak denotes a new-line.
	TokenSoftBreak
)

// Name returns the type of the TokenType, as a string.
func (t TokenType) Name() string {
	switch t {
	case TokenOpenParen:
		return "("
	case TokenCloseParen:
		return ")"
	case TokenOpenBrace:
		return "{"
	case TokenCloseBrace:
		return "}"
	case TokenHardBreak:
		return ";"
	case TokenAssign:
		return ":="
	case TokenAtom:
		return "ATOM"
	case TokenSlash:
		return "\\"
	case TokenDot:
		return "."
	case TokenSoftBreak:
		return "\\n"
	default:
		panic(fmt.Errorf("unknown token type %v", t))
	}
}

// Token is the concrete token type for the Saccharine language.
type Token = token.Token[TokenType]