package engine

type diffSensitivity struct {
	prefixes pathPrefixIndex
	pointers []string
}

func newDiffSensitivity(left, right map[string]bool) *diffSensitivity {
	sensitivity := &diffSensitivity{}
	seen := make(map[string]struct{}, len(left)+len(right))
	for _, classifications := range []map[string]bool{left, right} {
		for pointer, classified := range classifications {
			if !classified {
				continue
			}
			if _, found := seen[pointer]; found {
				continue
			}
			seen[pointer] = struct{}{}
			id := len(sensitivity.pointers)
			sensitivity.pointers = append(sensitivity.pointers, pointer)
			sensitivity.prefixes.insert(pointer, id)
		}
	}
	return sensitivity
}

func (sensitivity *diffSensitivity) isSensitiveAtOrAbove(pointer string) bool {
	if sensitivity == nil {
		return false
	}
	found := false
	sensitivity.prefixes.visitAncestors(pointer, func(int) { found = true })
	return found
}

func (sensitivity *diffSensitivity) hasStrictDescendant(pointer string) bool {
	if sensitivity == nil {
		return false
	}
	found := false
	sensitivity.prefixes.visitDescendants(pointer, func(id int) {
		if sensitivity.pointers[id] != pointer {
			found = true
		}
	})
	return found
}