const LOCAL_STORAGE_KEY="token"

export const Anonymous = Symbol("anonymous")
class Token {
    constructor({token, expiresAt}) {
        this.token = token
        this.expiresAt = new Date(expiresAt)
    }
}

export function loadToken() {
    let data = localStorage[LOCAL_STORAGE_KEY]
    if (data == null) { return Anonymous }
    data = JSON.parse(data)
    if (data == null || data.token == null) { return Anonymous }

    let token = new Token(data)
    if(token.expiresAt < new Date()) { return Anonymous }

    return token
}

export function saveToken(value) {
    if(value == null || !value.token) return;
    localStorage[LOCAL_STORAGE_KEY] = JSON.stringify(value)
}