/**
 * Runs in Ozon's MAIN world so the request has exactly the same origin and
 * session context as the page. It accepts only Atlas' two fixed, numeric-SKU
 * routes and returns a small widget-state allowlist; it never exposes cookies,
 * request headers or arbitrary fetch capability to the isolated script.
 */
export default defineContentScript({
    matches: ['*://www.ozon.ru/*', '*://www.ozon.kz/*', '*://www.ozon.by/*'],
    world: 'MAIN',
    runAt: 'document_idle',
    main() {
        window.addEventListener('message', (event) => {
            if (event.source !== window || !isRequest(event.data)) return;
            void respond(event.data);
        });
    },
});

type Request = {
    source: 'atlas-collector';
    type: 'ozon-page-json.request';
    requestId: string;
    kind: 'modal-aspects' | 'product' | 'product-detail';
    sku: string;
};

function isRequest(value: unknown): value is Request {
    if (!value || typeof value !== 'object' || Array.isArray(value))
        return false;
    const data = value as Record<string, unknown>;
    return (
        data.source === 'atlas-collector' &&
        data.type === 'ozon-page-json.request' &&
        typeof data.requestId === 'string' &&
        /^[a-zA-Z0-9-]{16,120}$/.test(data.requestId) &&
        (data.kind === 'modal-aspects' ||
            data.kind === 'product' ||
            data.kind === 'product-detail') &&
        typeof data.sku === 'string' &&
        /^\d{4,}$/.test(data.sku)
    );
}

async function respond(request: Request) {
    try {
        const pagePath =
            request.kind === 'modal-aspects'
                ? `/modal/aspectsNew?product_id=${request.sku}`
                : request.kind === 'product-detail'
                  ? `/product/${request.sku}/?layout_container=pdpPage2column&layout_page_index=2`
                  : `/product/${request.sku}/`;
        const response = await fetch(
            `/api/entrypoint-api.bx/page/json/v2?url=${encodeURIComponent(pagePath)}`,
            { credentials: 'same-origin' },
        );
        if (!response.ok)
            throw new Error(`Ozon 页面状态请求失败（HTTP ${response.status}）`);
        const value = await response.json();
        window.postMessage(
            {
                source: 'atlas-collector',
                type: 'ozon-page-json.response',
                requestId: request.requestId,
                ok: true,
                data: allowlistedPageState(value),
            },
            location.origin,
        );
    } catch (error) {
        window.postMessage(
            {
                source: 'atlas-collector',
                type: 'ozon-page-json.response',
                requestId: request.requestId,
                ok: false,
                error:
                    error instanceof Error
                        ? error.message
                        : 'Ozon 页面状态请求失败',
            },
            location.origin,
        );
    }
}

function allowlistedPageState(value: unknown) {
    if (!value || typeof value !== 'object' || Array.isArray(value))
        return { widgetStates: {} };
    const states = (value as { widgetStates?: unknown }).widgetStates;
    if (!states || typeof states !== 'object' || Array.isArray(states))
        return { widgetStates: {} };
    const widgetStates: Record<string, unknown> = {};
    for (const [name, state] of Object.entries(
        states as Record<string, unknown>,
    )) {
        if (
            /^web(Aspects|AspectsModal|ProductHeading|Price|Gallery|Description|RichContent|Features|ShortCharacteristics|DetailedCharacteristics|Characteristics)-/.test(
                name,
            )
        ) {
            widgetStates[name] = state;
        }
    }
    return { widgetStates };
}