// Copyright 2023 The Dawn & Tint Authors
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//    this software without specific prior written permission.
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package cnf

import (
	"strings"

	"dawn.googlesource.com/dawn/tools/src/transform"
)

// Key is a map key type returned by Key() methods on Ands, Ors and Unary.
type Key string

// Key returns a Key that can be used to sort the Ands
func (e Ands) Key() Key {
	parts, _ := transform.Slice(e, func(o Ors) (string, error) {
		return string(o.Key()), nil
	})
	return Key(strings.Join(parts, "&&"))
}

// Key returns a Key that can be used to sort the Ors
func (o Ors) Key() Key {
	parts, _ := transform.Slice(o, func(u Unary) (string, error) {
		return string(u.Key()), nil
	})
	return Key(strings.Join(parts, "||"))
}

// Key returns a Key that can be used to sort the Unary
func (u Unary) Key() Key {
	if u.Negate {
		return Key(u.Var + "!")
	}
	return Key(u.Var)
}