import { swaggerUI } from "@hono/swagger-ui";
import { OpenAPIHono } from "@hono/zod-openapi";
import { Duration, type DurationLike } from "luxon";

import { onNewEpisode } from "~/controllers/internal/new-episode";
import { maybeUpdateLastConnectedAt } from "~/controllers/maybeUpdateLastConnectedAt";
import { AnilistUpdateType } from "~/libs/anilist/updateType";
import { calculateExponentialBackoff } from "~/libs/calculateExponentialBackoff";
import type { QueueName } from "~/libs/tasks/queueName.ts";
import type { QueueBody } from "~/libs/tasks/queueTask";

export const app = new OpenAPIHono<{ Bindings: Env }>();

app.use(maybeUpdateLastConnectedAt);

app.route(
  "/",
  await import("~/controllers/health-check").then(
    (controller) => controller.default,
  ),
);
app.route(
  "/title",
  await import("~/controllers/title").then((controller) => controller.default),
);
app.route(
  "/episodes",
  await import("~/controllers/episodes").then(
    (controller) => controller.default,
  ),
);
app.route(
  "/search",
  await import("~/controllers/search").then((controller) => controller.default),
);
app.route(
  "/watch-status",
  await import("~/controllers/watch-status").then(
    (controller) => controller.default,
  ),
);
app.route(
  "/token",
  await import("~/controllers/token").then((controller) => controller.default),
);
app.route(
  "/auth",
  await import("~/controllers/auth").then((controller) => controller.default),
);
app.route(
  "/popular",
  await import("~/controllers/popular").then(
    (controller) => controller.default,
  ),
);
app.route(
  "/internal",
  await import("~/controllers/internal").then(
    (controller) => controller.default,
  ),
);

// The OpenAPI documentation will be available at /doc
app.doc("/openapi.json", {
  openapi: "3.0.0",
  info: {
    version: "1.0.0",
    title: "Aniplay API",
  },
});

app.get("/docs", swaggerUI({ url: "/openapi.json" }));

export default {
  fetch: app.fetch,
  async queue(batch) {
    onMessageQueue(batch, async (message, queueName) => {
      switch (queueName) {
        case "ANILIST_UPDATES":
          const anilistUpdateBody =
            message.body as QueueBody["ANILIST_UPDATES"];
          switch (anilistUpdateBody.updateType) {
            case AnilistUpdateType.UpdateWatchStatus:
              if (!anilistUpdateBody[AnilistUpdateType.UpdateWatchStatus]) {
                console.error(
                  `Discarding update, unknown body ${JSON.stringify(message.body)}`,
                );
                return;
              }

              const { updateWatchStatusOnAnilist } =
                await import("~/controllers/watch-status/anilist");
              const payload =
                anilistUpdateBody[AnilistUpdateType.UpdateWatchStatus];
              await updateWatchStatusOnAnilist(
                payload.titleId,
                payload.watchStatus,
                payload.aniListToken,
              );
              break;
            default:
              throw new Error(
                `Unhandled update type: ${anilistUpdateBody.updateType}`,
              );
          }
          break;
        case "NEW_EPISODE":
          const newEpisodeBody = message.body as QueueBody["NEW_EPISODE"];
          await onNewEpisode(
            newEpisodeBody.aniListId,
            newEpisodeBody.episodeNumber,
          );
          break;
        default:
          throw new Error(`Unhandled queue name: ${queueName}`);
      }
    });
  },
  async scheduled(event, env, ctx) {
    const { processDelayedTasks } =
      await import("~/libs/tasks/processDelayedTasks");
    await processDelayedTasks(env);
  },
} satisfies ExportedHandler<Env>;

const retryDelayConfig: Partial<
  Record<QueueName, { min: DurationLike; max: DurationLike }>
> = {
  NEW_EPISODE: {
    min: Duration.fromObject({ hours: 1 }),
    max: Duration.fromObject({ hours: 12 }),
  },
};

function onMessageQueue<QN extends QueueName>(
  messageBatch: MessageBatch<unknown>,
  callback: (message: Message<QueueBody[QN]>, queueName: QN) => void,
) {
  for (const message of messageBatch.messages) {
    try {
      callback(message as Message<QueueBody[QN]>, messageBatch.queue as QN);
      message.ack();
    } catch (error) {
      console.error(
        `Failed to process message ${message.id} for queue ${messageBatch.queue} with body ${JSON.stringify(message.body)}`,
      );
      console.error(error);
      message.retry({
        delaySeconds: calculateExponentialBackoff({
          attempt: message.attempts,
          baseMin: retryDelayConfig[messageBatch.queue as QN]?.min,
          absCap: retryDelayConfig[messageBatch.queue as QN]?.max,
        }),
      });
    }
  }
}

export { AnilistDurableObject as AnilistDo } from "~/libs/anilist/anilist-do.ts";