import {
  getMetroCache,
  indexBlacklistFlag,
  indexExportsFlags,
} from "@metro/internals/caches";
import { Metro } from "@metro/types";

import { ModuleFlags, ModulesMapInternal } from "./enums";

const { before, instead } = require("spitroast");

export const metroModules: Metro.ModuleList = window.modules;
const metroRequire = (id: string | number) => window.__r(+id);

// eslint-disable-next-line func-call-spacing
const moduleSubscriptions = new Map<number, Set<() => void>>();
const blacklistedIds = new Set<number>();
const noopHandler = () => undefined;
const functionToString = Function.prototype.toString;

let patchedInspectSource = false;
let patchedImportTracker = false;
let patchedNativeComponentRegistry = false;
let _importingModuleId: number = -1;

for (const key in metroModules) {
  const id = Number(key);
  const metroModule = metroModules[id];

  const cache = getMetroCache().flagsIndex[id];
  if (cache & ModuleFlags.BLACKLISTED) {
    blacklistModule(id);
    continue;
  }

  if (metroModule!.factory) {
    instead("factory", metroModule, ((
      args: Parameters<Metro.FactoryFn>,
      origFunc: Metro.FactoryFn,
    ) => {
      const originalImportingId = _importingModuleId;
      _importingModuleId = id;

      const { 1: metroRequire, 4: moduleObject } = args;

      args[2 /* metroImportDefault */] = (id) => {
        const exps = metroRequire(id);
        return exps && exps.__esModule ? exps.default : exps;
      };

      args[3 /* metroImportAll */] = (id) => {
        const exps = metroRequire(id);
        if (exps && exps.__esModule) return exps;

        const importAll: Record<string, any> = {};
        if (exps) Object.assign(importAll, exps);
        importAll.default = exps;
        return importAll;
      };

      origFunc(...args);
      if (!isBadExports(moduleObject.exports)) {
        onModuleRequire(moduleObject.exports, id);
      } else {
        blacklistModule(id);
      }

      _importingModuleId = originalImportingId;
    }) as any); // If only spitroast had better types
  }
}

/** Makes the module associated with the specified ID non-enumberable. */
function blacklistModule(id: number) {
  Object.defineProperty(metroModules, id, { enumerable: false });
  blacklistedIds.add(id);
  indexBlacklistFlag(Number(id));
}

function isBadExports(exports: any) {
  return (
    !exports ||
    exports === window ||
    exports["<!@ pylix was here :fuyusquish: \n Hi pylix! -cocobo1!@>"] ===
      null ||
    (exports.__proto__ === Object.prototype &&
      Reflect.ownKeys(exports).length === 0) ||
    exports.default?.[Symbol.toStringTag] === "IntlMessagesProxy"
  );
}

function onModuleRequire(moduleExports: any, id: Metro.ModuleID) {
  indexExportsFlags(id, moduleExports);

  // Temporary
  moduleExports.initSentry &&= () => undefined;
  if (moduleExports.default?.track && moduleExports.default.trackMaker)
    moduleExports.default.track = () => Promise.resolve();

  if (moduleExports.registerAsset) {
    require("@lib/api/assets/patches").patchAssets(moduleExports);
  }

  // There are modules registering the same native component
  if (
    !patchedNativeComponentRegistry &&
    [
      "customBubblingEventTypes",
      "customDirectEventTypes",
      "register",
      "get",
    ].every((x) => moduleExports[x])
  ) {
    instead("register", moduleExports, ([name, cb]: any, origFunc: any) => {
      try {
        return origFunc(name, cb);
      } catch {
        return name;
      }
    });

    patchedNativeComponentRegistry = true;
  }

  // Hook DeveloperExperimentStore
  if (
    moduleExports?.default?.constructor?.displayName ===
    "DeveloperExperimentStore"
  ) {
    moduleExports.default = new Proxy(moduleExports.default, {
      get(target, property, receiver) {
        if (property === "isDeveloper") {
          // Hopefully won't explode accessing it here :3
          const { settings } = require("@lib/api/settings");
          return settings.enableDiscordDeveloperSettings ?? false;
        }

        return Reflect.get(target, property, receiver);
      },
    });
  }

  if (!patchedImportTracker && moduleExports.fileFinishedImporting) {
    before("fileFinishedImporting", moduleExports, ([filePath]: [string]) => {
      if (_importingModuleId === -1 || !filePath) return;
      metroModules[_importingModuleId]!.__filePath = filePath;
    });
    patchedImportTracker = true;
  }

  // Funny infinity recursion caused by a race condition
  if (!patchedInspectSource && window["__core-js_shared__"]) {
    const inspect = (f: unknown) =>
      typeof f === "function" && functionToString.apply(f, []);
    window["__core-js_shared__"].inspectSource = inspect;
    patchedInspectSource = true;
  }

  //
  if (moduleExports.findHostInstance_DEPRECATED) {
    const prevExports = metroModules[id - 1]?.publicModule.exports;
    const inc = prevExports.default?.reactProfilingEnabled ? 1 : -1;
    if (!metroModules[id + inc]?.isInitialized) {
      blacklistModule(id + inc);
    }
  }

  // Hindi timestamps moment
  if (moduleExports.isMoment) {
    instead(
      "defineLocale",
      moduleExports,
      (args: [string], orig: (lcl: string) => string) => {
        const origLocale = moduleExports.locale();
        orig(...args);
        moduleExports.locale(origLocale);
      },
    );
  }

  const subs = moduleSubscriptions.get(Number(id));
  if (subs) {
    subs.forEach((s) => s());
    moduleSubscriptions.delete(Number(id));
  }
}

export function getImportingModuleId() {
  return _importingModuleId;
}

export function subscribeModule(id: number, cb: () => void): () => void {
  const subs = moduleSubscriptions.get(id) ?? new Set();

  subs.add(cb);
  moduleSubscriptions.set(id, subs);

  return () => subs.delete(cb);
}

export function requireModule(id: Metro.ModuleID) {
  if (!metroModules[0]?.isInitialized) metroRequire(0);
  if (blacklistedIds.has(id)) return undefined;

  if (Number(id) === -1) return require("@metro/polyfills/redesign");

  if (metroModules[id]?.isInitialized && !metroModules[id]?.hasError) {
    return metroRequire(id);
  }

  // Disable Internal RN error reporting logic
  const originalHandler = ErrorUtils.getGlobalHandler();
  ErrorUtils.setGlobalHandler(noopHandler);

  let moduleExports;
  try {
    moduleExports = metroRequire(id);
  } catch {
    blacklistModule(id);
    moduleExports = undefined;
  }

  // Done initializing! Now, revert our hacks
  ErrorUtils.setGlobalHandler(originalHandler);

  return moduleExports;
}

export function* getModules(uniq: string, all = false) {
  yield [-1, require("@metro/polyfills/redesign")];

  let cache = getMetroCache().findIndex[uniq];
  if (all && !cache?.[`_${ModulesMapInternal.FULL_LOOKUP}`]) cache = undefined;
  if (cache?.[`_${ModulesMapInternal.NOT_FOUND}`]) return;

  for (const id in cache) {
    if (id[0] === "_") continue;
    const exports = requireModule(Number(id));
    if (isBadExports(exports)) continue;
    yield [id, exports];
  }

  for (const id in metroModules) {
    const exports = requireModule(Number(id));
    if (isBadExports(exports)) continue;
    yield [id, exports];
  }
}

export function* getCachedPolyfillModules(name: string) {
  const cache = getMetroCache().polyfillIndex[name]!;

  for (const id in cache) {
    const exports = requireModule(Number(id));
    if (isBadExports(exports)) continue;
    yield [id, exports];
  }

  if (!cache[`_${ModulesMapInternal.FULL_LOOKUP}`]) {
    for (const id in metroModules) {
      const exports = requireModule(Number(id));
      if (isBadExports(exports)) continue;
      yield [id, exports];
    }
  }
}