import { OpenAPIHono, createRoute, z } from "@hono/zod-openapi";
import { env } from "hono/adapter";
import { streamSSE } from "hono/streaming";

import { fetchEpisodes } from "~/controllers/episodes/getByAniListId";
import { maybeScheduleNextAiringEpisode } from "~/libs/maybeScheduleNextAiringEpisode";
import { readEnvVariable } from "~/libs/readEnvVariable";
import { associateDeviceIdWithUsername } from "~/models/token";
import { setWatchStatus } from "~/models/watchStatus";
import type { Env } from "~/types/env";
import { EpisodesResponseSchema } from "~/types/episode";
import { ErrorResponse, ErrorResponseSchema } from "~/types/schema";
import { Title } from "~/types/title";

import { getUser } from "./getUser";
import { getWatchingTitles } from "./getWatchingTitles";

const UserSchema = z.object({
  name: z.string(),
  avatar: z.object({
    medium: z.string().nullable(),
    large: z.string(),
  }),
  statistics: z.object({
    minutesWatched: z.number().openapi({ type: "integer", format: "int64" }),
    episodesWatched: z.number().int(),
    count: z.number().int(),
    meanScore: z.number().openapi({ type: "number", format: "float" }),
  }),
});

const route = createRoute({
  tags: ["aniplay", "auth"],
  summary:
    "Authenticate with AniList and return all upcoming and 'currently watching' titles",
  operationId: "authenticateAniList",
  method: "get",
  path: "/",
  request: {
    headers: z.object({
      "x-anilist-token": z.string(),
      "x-aniplay-device-id": z.string(),
    }),
    // Uncomment when testing locally
    // headers: z.object({
    //   "x-anilist-token":
    //     process.env.NODE_ENV === "production"
    //       ? z.string()
    //       : z.string().optional(),
    //   "x-aniplay-device-id":
    //     process.env.NODE_ENV === "production"
    //       ? z.string()
    //       : z.string().optional(),
    // }),
    // query: z.object({
    //   aniListToken: z.string().optional(),
    //   deviceId: z.string().optional(),
    // }),
  },
  responses: {
    200: {
      content: {
        "text/event-stream": {
          schema: z.union([
            z.object({ title: Title, episodes: EpisodesResponseSchema }),
            UserSchema,
          ]),
        },
      },
      description: "Streams a list of titles",
    },
    401: {
      content: {
        "application/json": {
          schema: ErrorResponseSchema,
        },
      },
      description: "Failed to authenticate with AniList",
    },
    500: {
      content: {
        "application/json": {
          schema: ErrorResponseSchema,
        },
      },
      description: "Error fetching episodes",
    },
  },
});

const app = new OpenAPIHono<Env>();

app.openapi(route, async (c) => {
  const deviceId =
    c.req.header("X-Aniplay-Device-Id") ?? c.req.query("deviceId");
  const aniListToken =
    c.req.header("X-AniList-Token") ?? c.req.query("aniListToken");

  if (!aniListToken) {
    return c.json(ErrorResponse, { status: 401 });
  }

  let user: Awaited<ReturnType<typeof getUser>>;
  try {
    user = await getUser(aniListToken);
    if (!user) {
      return c.json(ErrorResponse, { status: 401 });
    }
  } catch (error) {
    console.error(new Error("Failed to authenticate with AniList"));
    console.error(error);
    return c.json(ErrorResponse, { status: 500 });
  }

  try {
    await associateDeviceIdWithUsername(
      env(c, "workerd"),
      deviceId!,
      user.name!,
    );
  } catch (error) {
    console.error(new Error("Failed to associate device"));
    console.error(error);
    return c.json(ErrorResponse, { status: 500 });
  }

  return streamSSE(
    c,
    async (stream) => {
      stream.writeSSE({ event: "user", data: JSON.stringify(user) });

      let currentPage = 1;
      let hasNextPage = true;

      do {
        const { mediaList, pageInfo } = await getWatchingTitles(
          user.name!,
          currentPage++,
          aniListToken,
          c.executionCtx,
        );
        if (!mediaList) {
          break;
        }

        if (!(pageInfo?.hasNextPage ?? false) && (pageInfo?.total ?? 0) > 0) {
          stream.writeSSE({
            event: "count",
            data: pageInfo!.total.toString(),
          });
        }

        for (const mediaObj of mediaList) {
          const media = mediaObj?.media!;
          if (!media) {
            continue;
          }

          const mediaListEntry = media.mediaListEntry;
          if (mediaListEntry) {
            const { wasAdded } = await setWatchStatus(
              env(c, "workerd"),
              deviceId!,
              media.id,
              mediaListEntry.status,
            );
            if (wasAdded) {
              await maybeScheduleNextAiringEpisode(
                env<Env, typeof c>(c, "workerd"),
                c.req,
                media.id,
              );
            }
          }

          const nextEpisode = media.nextAiringEpisode?.episode;
          if (
            nextEpisode === 0 ||
            nextEpisode === 1 ||
            media.status === "NOT_YET_RELEASED"
          ) {
            await stream.writeSSE({
              event: "title",
              data: JSON.stringify({ title: media, episodes: [] }),
              id: media.id.toString(),
            });
            continue;
          }

          await fetchEpisodes(
            media.id,
            readEnvVariable<boolean>(c.env, "ENABLE_ANIFY"),
          ).then(({ result: { episodes } }) => {
            stream.writeSSE({
              event: "title",
              data: JSON.stringify({ title: media, episodes }),
              id: media.id.toString(),
            });
          });
        }

        hasNextPage = pageInfo?.hasNextPage ?? false;
        hasNextPage = pageInfo?.hasNextPage ?? false;
        console.log(hasNextPage);
        hasNextPage = pageInfo?.hasNextPage ?? false;
        console.log(hasNextPage);
      } while (hasNextPage);

      // send end event instead of closing the connection to let the client know that the stream didn't end abruptly
      await stream.writeSSE({ event: "end", data: "end" });
    },
    async (err, stream) => {
      console.error("Error occurred in SSE");
      console.error(err);
      await stream.writeln("An error occurred");
      await stream.close();
    },
  );
});

export default app;