package core

type Permission int

const (
	Invalid Permission = iota
	Public
	Internal
	Private
)

func ParsePerm(p int) Permission {
	switch p {
	case 1:
		return Public
	case 2:
		return Internal
	case 3:
		return Private
	}
	return Invalid
}

func ParsePermString(p string) Permission {
	switch p {
	case "1":
		return Public
	case "2":
		return Internal
	case "3":
		return Private
	}
	return Invalid
}

func ReadPerm(username string, p *Page) bool {
	switch p.Perm {
	case Public:
		return true
	case Internal:
		return username != ""
	case Private:
		return username == p.Owner
	}
	return false
}

func WritePerm(username, section string, p *Page) bool {
	if section != WikiSection && section != username {
		return false
	}
	return writePerm(username, p)
}

func writePerm(username string, p *Page) bool {
	switch p.Perm {
	case Public, Internal:
		if p.Owner == WikiSection {
			return username != ""
		}
		return username == p.Owner
	case Private:
		return username == p.Owner
	}
	return false
}