class TabsExtensionConfigs {
    #settings = {};

    /** @returns {boolean} */  get container() { return this.#settings.container; }
    /** @returns {boolean} */  get forge() { return this.#settings.forge; }
    /** @returns {boolean} */  get open() { return this.#settings.open; }
    /** @returns {boolean} */  get sort() { return this.#settings.sort; }
    /** @returns {boolean} */  get toggle() { return this.#settings.toggle; }
    /** @returns {boolean} */  get scripts_toggle() { return this.#settings.scripts_toggle; }
    /** @returns {boolean} */  get rmb() { return this.#settings.rmb; }
    /** @returns {boolean} */  get version() { return this.#settings.version; }

    constructor() {
        const settingsIDs = [
            ['container', 'checkbox'],
            ['forge', 'checkbox'],
            ['open', 'checkbox'],
            ['sort', 'checkbox'],
            ['toggle', 'checkbox'],
            ['scripts_toggle', 'checkbox'],
            ['rmb', 'checkbox'],
            ['version', 'checkbox']
        ];

        for (const [key, type] of settingsIDs) {
            const wrapper = document.getElementById(`setting_tabs_ex_${key}`);
            const element = wrapper?.querySelector(`input[type=${type}]`);
            this.#settings[key] = (type === 'checkbox') ? !!element?.checked : (element?.value ?? "");
        }
    }

    /** @param {string} name @param {string} mode @return {string} */
    #validateMode(name, mode) {
        const availableModes = (name === "tabs")
            ? ["left", "right"]
            : ["left", "right", "above", "below", "hide", "keep"];
        return availableModes.includes(mode) ? mode : availableModes[0];
    }

    /**
     * CSV -> Dict
     * @return {Object.<string, Object.<string, string>>}
     */
    parseConfigs() {
        try {
            const config = { "txt": {}, "img": {} };
            const holder = document.getElementById('TABSEX_LBL');
            const textarea = holder?.querySelector('textarea');
            const raw = textarea?.value ?? "";

            const lines = raw.trim().split('\n').slice(1).filter(Boolean);
            for (const line of lines) {
                const [ext, t, i] = line.split(',').map(col => (col ?? '').trim());
                if (!ext) continue;
                config["txt"][ext] = this.#validateMode(ext, t);
                config["img"][ext] = this.#validateMode(ext, i);
            }

            // пусто? вернём дефолт
            if (Object.keys(config.txt ?? {}).length === 0) {
                return {
                    "txt": { 'tabs': 'left', 'default': 'left' },
                    "img": { 'tabs': 'right', 'default': 'right' }
                };
            }
            return config;
        } catch (_e) {
            alert(`[Tabs Extension]: Something went wrong while parsing the configs... Using defaults.`);
            return {
                "txt": { 'tabs': 'left', 'default': 'left' },
                "img": { 'tabs': 'right', 'default': 'right' }
            };
        }
    }

    /**
     * Dict -> CSV (фиксированный порядок)
     * @param {Object.<string, Object.<string, string>>} config
     */
    saveConfigs(config) {
        const holder = document.getElementById('TABSEX_LBL');
        const textarea = holder?.querySelector('textarea');
        if (!textarea) return;

        const data = [",txt,img"];

        const keys = Array.from(new Set([
            ...Object.keys(config["txt"] || {}),
            ...Object.keys(config["img"] || {})
        ])).sort((a, b) => {
            const aHead = (a === 'tabs' || a === 'default');
            const bHead = (b === 'tabs' || b === 'default');
            if (aHead && !bHead) return -1;
            if (!aHead && bHead) return 1;
            return a.localeCompare(b);
        });

        for (const key of keys) {
            data.push([key, config["txt"][key] ?? "", config["img"][key] ?? ""].join(","));
        }

        textarea.value = data.join("\n");
        if (typeof updateInput === 'function') updateInput(textarea);

        const btn = document.getElementById('TABSEX_BTN');
        btn?.click();
    }
}