export type VideoPlatform = "youtube" | "tiktok";
export type VideoJobStatus =
  | "pending"
  | "processing"
  | "completed"
  | "failed";
export type VideoUploadStatus = "draft" | "scheduled" | "processing" | "partial" | "completed" | "failed";

export type VideoPublishResult = {
  id: string;
  url: string;
};

export type VideoPublishJobRecord = {
  id: string;
  uploadId: string;
  platform: VideoPlatform;
  status: VideoJobStatus;
  attempts: number;
};

export type VideoPublishUploadRecord = {
  id: string;
  status: VideoUploadStatus;
  scheduledAt: Date | null;
  createdAt: Date;
};

export type VideoPublishingEvent = {
  uploadId: string;
  jobId?: string;
  platform?: VideoPlatform;
  status: Exclude<VideoUploadStatus, "draft"> | VideoJobStatus;
};

export type VideoPublishingStore<
  TUpload extends VideoPublishUploadRecord,
  TJob extends VideoPublishJobRecord,
> = {
  claimJob: (jobId: string, startedAt: Date) => Promise<TJob | null>;
  findUpload: (uploadId: string) => Promise<TUpload | null>;
  markCompleted: (job: TJob, result: VideoPublishResult, completedAt: Date) => Promise<void>;
  markFailed: (job: TJob, message: string) => Promise<void>;
  findDueUploads: (now: Date) => Promise<TUpload[]>;
  findJobs: (uploadId: string) => Promise<TJob[]>;
  updateUploadStatus: (upload: TUpload, status: VideoUploadStatus, updatedAt: Date) => Promise<void>;
};

export type VideoPublishingModule = {
  publishJob: (jobId: string) => Promise<void>;
  processDue: () => Promise<void>;
};

export function createVideoPublishingModule<
  TUpload extends VideoPublishUploadRecord,
  TJob extends VideoPublishJobRecord,
>({
  store,
  publishers,
  notify,
  reportNotificationFailure = (error) => {
    console.error("Failed to publish video lifecycle notification", error);
  },
  now = () => new Date(),
}: {
  store: VideoPublishingStore<TUpload, TJob>;
  publishers: Record<VideoPlatform, (upload: TUpload) => Promise<VideoPublishResult>>;
  notify: (event: VideoPublishingEvent) => Promise<unknown>;
  reportNotificationFailure?: (error: unknown) => void;
  now?: () => Date;
}): VideoPublishingModule {
  async function sendNotification(event: VideoPublishingEvent) {
    try {
      await notify(event);
    } catch (error) {
      reportNotificationFailure(error);
    }
  }

  async function publishJob(jobId: string) {
    const job = await store.claimJob(jobId, now());
    if (!job) return;

    const upload = await store.findUpload(job.uploadId);
    if (!upload) throw new Error("Upload record not found.");

    await sendNotification({
      uploadId: upload.id,
      jobId: job.id,
      platform: job.platform,
      status: "processing",
    });

    try {
      const result = await publishers[job.platform](upload);
      await store.markCompleted(job, result, now());
      await sendNotification({
        uploadId: upload.id,
        jobId: job.id,
        platform: job.platform,
        status: "completed",
      });
    } catch (error) {
      const message = error instanceof Error ? error.message : "Platform upload failed.";
      await store.markFailed(job, message);
      await sendNotification({
        uploadId: upload.id,
        jobId: job.id,
        platform: job.platform,
        status: "failed",
      });
      throw error;
    }
  }

  async function processDue() {
    const dueUploads = await store.findDueUploads(now());

    for (const upload of dueUploads) {
      const jobs = await store.findJobs(upload.id);
      for (const job of jobs.filter((item) => item.status !== "completed")) {
        await publishJob(job.id).catch((error) => {
          const message = error instanceof Error ? error.message : "Platform upload failed.";
          console.error(`[${job.platform}] ${job.id}: ${message}`);
        });
      }

      const currentJobs = await store.findJobs(upload.id);
      const nextStatus: VideoUploadStatus = currentJobs.every(
        (job) => job.status === "completed",
      )
        ? "completed"
        : currentJobs.some((job) => job.status === "completed")
          ? "partial"
          : "failed";
      await store.updateUploadStatus(upload, nextStatus, now());
      await sendNotification({ uploadId: upload.id, status: nextStatus });
    }
  }

  return { publishJob, processDue };
}