import { RestManager } from "./restManager.ts";

/** Processes the queue by looping over each path separately until the queues are empty. */
export function processQueue(rest: RestManager, id: string) {
    const queue = rest.pathQueues.get(id);
    if (!queue) return;

    while (queue.requests.length) {
        rest.debug(`[REST - processQueue] Running while loop.`);
        // SELECT THE FIRST ITEM FROM THIS QUEUE
        const queuedRequest = queue.requests[0];
        // IF THIS DOESN'T HAVE ANY ITEMS JUST CANCEL, THE CLEANER WILL REMOVE IT.
        if (!queuedRequest) break;

        const basicURL = rest.simplifyUrl(queuedRequest.request.url, queuedRequest.request.method);

        // IF THIS URL IS STILL RATE LIMITED, TRY AGAIN
        const urlResetIn = rest.checkRateLimits(rest, basicURL);
        if (urlResetIn) {
            // ONLY ADD TIMEOUT IF ANOTHER QUEUE IS NOT PENDING
            if (!queue.isWaiting) {
                queue.isWaiting = true;

                setTimeout(() => {
                    queue.isWaiting = false;

                    rest.debug(`[REST - processQueue] rate limited, running setTimeout.`);
                    rest.processQueue(rest, id);
                }, urlResetIn);
            }

            // BREAK WHILE LOOP
            break;
        }

        // IF A BUCKET EXISTS, CHECK THE BUCKET'S RATE LIMITS
        const bucketResetIn = queuedRequest.payload.bucketId
            ? rest.checkRateLimits(rest, queuedRequest.payload.bucketId)
            : false;
        // THIS BUCKET IS STILL RATE LIMITED, RE-ADD TO QUEUE
        if (bucketResetIn) continue;
        // EXECUTE THE REQUEST

        // CUSTOM HANDLER FOR USER TO LOG OR WHATEVER WHENEVER A FETCH IS MADE
        rest.debug(`[REST - Add To Global Queue] ${JSON.stringify(queuedRequest.payload)}`);
        rest.globalQueue.push({
            ...queuedRequest,
            urlToUse: queuedRequest.request.url,
            basicURL,
        });
        rest.processGlobalQueue(rest);
        queue.requests.shift();
    }

    // ONCE QUEUE IS DONE, WE CAN TRY CLEANING UP
    rest.cleanupQueues(rest);
}