import { dbApiPostData } from "$lib/server/db/apipostdata.db";
import { dbApiUser } from "$lib/server/db/apiuser.db";
import { postDataToApi } from "$lib/server/postdata/post.handler";
import { getAllSessions } from "$lib/server/utils/session.service";
import { getULID } from "$lib/utils";
import {
  type APISession,
  type ServerError,
  zPostDataEntry,
  zPostDataFilters,
  zPostDataHistoryFilters,
} from "$lib/utils/data.types";
import { createTRPCRouter, protectedProcedure } from "../t";
import { z } from "zod";
import {
  fetchDataForPosting,
  fetchPostDataHistory,
  updateBalanceOfPostUsers,
} from "$lib/server/postdata/postdata.gen.controller";
import { redis } from "$lib/server/connectors/redis";
import { constants } from "$lib/utils/constants";

async function hasPostSession() {
  const out = await redis.get(constants.POST_SESSION_KEY);
  if (out === null) {
    await redis.set(constants.POST_SESSION_KEY, "1");
    return false;
  }
  return out === "1";
}

async function removePostSession() {
  await redis.del(constants.POST_SESSION_KEY);
}

const postDataCacheStore = {
  get: async (key: string) => {
    return JSON.parse((await redis.get(`pdcc:${key}`)) ?? "[]");
  },
  set: async (key: string, data: any) => {
    await redis.setex(`pdcc:${key}`, 60 * 60 * 1, JSON.stringify(data));
  },
  del: async (key: string) => {
    await redis.del(`pdcc:${key}`);
  },
};

export const postDataApiRouter = createTRPCRouter({
  fetchPostDataHistory: protectedProcedure
    .input(zPostDataHistoryFilters)
    .mutation(async ({ input }) => {
      return await fetchPostDataHistory(input);
    }),

  hasPosted: protectedProcedure
    .input(zPostDataHistoryFilters)
    .query(async ({ input }) => {
      return {
        hasPosted: await dbApiPostData.doesPostHistoryDataExist(
          input.date,
          input.draw?.id ?? "",
        ),
      };
    }),

  getPostDataForPreview: protectedProcedure
    .input(zPostDataFilters)
    .query(async ({ input }) => {
      const date = input.date;
      const cacheKey = getULID();
      if (!input.draw) {
        return {
          ok: false,
          detail: "Draw is required",
          data: [],
          errors: undefined,
          key: cacheKey,
        };
      }

      console.log("[+] Fetching the users with updated balances");
      const balOut = await updateBalanceOfPostUsers(
        await dbApiUser.getAllPostUsersWithParentUsers(),
      );
      if (!balOut.ok || !balOut.data) {
        return {
          ok: false,
          key: cacheKey,
          detail: balOut.detail,
          data: [],
          users: [],
        };
      }
      const users = balOut.data;
      console.log(`[=] ${users.length} users found`);
      console.log(users);

      const result = await fetchDataForPosting(date, input, users);
      postDataCacheStore.set(cacheKey, result.data).catch(console.error);
      console.log("result.data.length = ", result.data.length);
      return { ...result, key: cacheKey };
    }),

  post: protectedProcedure
    .input(z.object({ yes: zPostDataFilters, cachedDataKey: z.string() }))
    .mutation(async ({ input }) => {
      if (await hasPostSession()) {
        return {
          ok: false,
          detail:
            "Already posting data, please wait for the current session to finish",
          errors: [
            {
              message:
                "Already posting data, please wait for the current session to finish",
            },
          ] as ServerError,
        };
      }
      const date = input.yes.date;
      const draw = input.yes.draw;
      if (!draw) {
        await removePostSession();
        return {
          ok: false,
          detail: "Draw is required",
          errors: [{ message: "Draw is required" }] as ServerError,
        };
      }
      const drawId = draw.id;

      console.log("[+] Fetching the users");
      const users = await dbApiUser.getAllPostUsersWithParentUsers();
      console.log(users);
      const balOut = await updateBalanceOfPostUsers(users);
      if (!balOut.ok || !balOut.data) {
        await removePostSession();
        return { ok: false, detail: balOut.detail, data: [], users: [] };
      }
      console.log(`[=] ${users} users found`);
      console.log(users);

      console.log("[+] Preparing the sessions for posting");
      const sessions = await getAllSessions();
      const userSessions = {} as Record<string, APISession>;
      for (const each of sessions) {
        const targetUser = users.find(
          (u) => each.key.includes(u.id) || each.value.userId === u.userId,
        );
        if (!targetUser) continue;
        userSessions[targetUser?.userId ?? ""] = each.value;
      }

      if (Object.keys(userSessions).length !== users.length) {
        await removePostSession();
        return {
          ok: false,
          detail: `Some users don't have a session to post data with`,
          errors: [
            { message: "Some users don't have a session to post data with" },
          ],
        };
      }

      let data: any[] = await postDataCacheStore.get(input.cachedDataKey);
      console.log("cached.data.length = ", data.length);
      if (data.length < 1) {
        console.log("No data found from preview, generating a list");
        const _out = await fetchDataForPosting(date, input.yes, balOut.data);
        if (!_out.ok) {
          await removePostSession();
          return _out;
        }
        data = _out.data;
        console.log("data.length = ", data.length);
      }

      if (data.length < 1) {
        await removePostSession();
        return {
          ok: false,
          detail: "No data found to post for the selected date and draw",
          errors: [
            { message: "No data found to post for the selected date and draw" },
          ],
        };
      }

      console.log(`[+] Posting ${data.length} entries to the API`);

      const res = await postDataToApi({
        sessions: userSessions,
        data,
        users: users,
        draw: draw,
      });
      console.timeEnd("Time taken to post data to the API");

      if (!res.ok) {
        await removePostSession();
        return { ok: false, detail: res.detail };
      }

      console.log(`[+] Data posted to the API successfully`);

      await dbApiPostData.upsertData({
        id: getULID(),
        drawId: +drawId.split(":")[1],
        bookDate: date,
        data,
        createdAt: new Date().toISOString(),
        updatedAt: new Date().toISOString(),
      });

      // Update the balance of the users after posting to the API
      await updateBalanceOfPostUsers(users);

      console.log("[+] Data saved to the database");

      await postDataCacheStore.del(input.cachedDataKey);
      await removePostSession();
      return {
        ok: true,
        detail: "Data successfully posted to API",
        errors: undefined,
      };
    }),
});