import migrate from "./data_migration.mjs";

export type Instance = {
    /**
     * The instance's (nick)name
     * @example "eepy.moe"
     * @example "KitsuClub"
     * @example "My Sharkey Instance"
     */
    name: string,
    /**
     * The instance's origin
     * @example "https://eepy.moe"
     * @example "https://kitsunes.club"
     */
    origin: string,
    /**
     * The kind of software the instance is running
     * @example "misskey"
     * @example "sharkey"
     * @example "akkoma"
     */
    software: string,
    /**
     * The instance's icon URL
     * @example undefined
     * @example "https://void.lgbt/favicon.png"
     */
    iconURL?: string,
    /**
     * The list of software names and groups the user prefers to autoredirect to this instance
     * @example ["sharkey", "misskey-compliant"]
     */
    preferredFor: string[],
}

export type LocalStorage = {
    version: number,
    instances: Instance[],
}

export default new class StorageManager {
    storage: LocalStorage;
    saveCallbacks: (() => void)[] = [];

    constructor() {
        this.load();
    }

    default(): LocalStorage {
        return {
            version: 1,
            instances: []
        }
    }

    load() {
        const data = JSON.parse(window.localStorage.getItem("storage") ?? "null") ?? this.default();
        this.storage = migrate(data);
    }

    save() {
        window.localStorage.setItem("storage", JSON.stringify(this.storage));
        this.saveCallbacks.forEach(c => c());
    }

    addSaveCallback(callback: () => void) {
        this.saveCallbacks.push(callback);
    }

    reset() {
        this.storage = this.default();
    }
}();