import type { Config, State } from "../createConfig.js";
import type { BaseStorage } from "../createStorage.js";
import { deserialize } from "./deserialize.js";

export const cookieStorage = {
    getItem(key) {
        if (typeof window === "undefined") return null;
        const value = parseCookie(document.cookie, key);
        return value ?? null;
    },
    setItem(key, value) {
        if (typeof window === "undefined") return;
        // biome-ignore lint/suspicious/noDocumentCookie: from wagmi
        document.cookie = `${key}=${value}`;
    },
    removeItem(key) {
        if (typeof window === "undefined") return;
        // biome-ignore lint/suspicious/noDocumentCookie: from wagmi
        document.cookie = `${key}=;max-age=-1`;
    },
} satisfies BaseStorage;

export function cookieToInitialState(config: Config, cookie?: string | null) {
    if (!cookie) return undefined;
    const key = `${config.storage?.key}.store`;
    const parsed = parseCookie(cookie, key);
    if (!parsed) return undefined;
    return deserialize<{ state: State }>(parsed).state;
}

export function parseCookie(cookie: string, key: string) {
    const keyValue = cookie.split("; ").find((x) => x.startsWith(`${key}=`));
    if (!keyValue) return undefined;
    return keyValue.substring(key.length + 1);
}