import {
  renderDevPanel,
  renderLoggedIn,
  renderLoggedOut,
  renderUpdateStatus,
  setUpdateDownloadStatus,
  setProtectedApiResult
} from "./view";
import { readAuthConfig, type AuthConfig } from "../shared/auth-config";
import {
  isAuthResponseMessage,
  type AuthResponseMessage
} from "../shared/auth-messages";
import { createProtectedApiClient } from "../shared/protected-api-client";
import {
  compareExtensionVersions,
  fetchUpdateManifest as fetchUpdateManifestFromUrl,
  type UpdateManifest
} from "../shared/update-check";
import { UPDATE_MANIFEST_URL } from "../shared/update-config";

interface BootPopupOptions {
  config?: Partial<AuthConfig>;
  currentVersion?: string;
  document?: Document;
  fetchProtectedApi?: () => Promise<unknown>;
  fetchUpdateManifest?: () => Promise<UpdateManifest>;
  sendMessage?: (message: unknown) => Promise<unknown>;
  updateManifestUrl?: string;
}

export async function bootPopup(options: BootPopupOptions = {}): Promise<void> {
  const currentDocument = options.document ?? document;
  const popupConfig = readAuthConfig(options.config);
  const currentVersion = options.currentVersion ?? readCurrentVersion();
  const root = currentDocument.querySelector("#app");
  const HTMLElementCtor = currentDocument.defaultView?.HTMLElement;

  if (!root || (HTMLElementCtor && !(root instanceof HTMLElementCtor))) {
    throw new Error("popup root #app is required");
  }

  const sendMessage =
    options.sendMessage ??
    ((message: unknown) =>
      Promise.resolve(
        (
          globalThis as typeof globalThis & {
            chrome?: {
              runtime?: {
                sendMessage?: (payload: unknown) => Promise<unknown>;
              };
            };
          }
        ).chrome?.runtime?.sendMessage?.(message)
      ));
  const fetchProtectedApi =
    options.fetchProtectedApi ??
    createProtectedApiClient({
      baseUrl: "http://127.0.0.1:4319",
      sendMessage
    }).loadProtectedMockData;
  const fetchUpdateManifest =
    options.fetchUpdateManifest ??
    (() =>
      fetchUpdateManifestFromUrl(
        options.updateManifestUrl ?? UPDATE_MANIFEST_URL
      ));

  await renderCurrentAuthState(root, popupConfig, sendMessage, fetchProtectedApi, {
    currentVersion,
    fetchUpdateManifest
  });
}

async function renderCurrentAuthState(
  root: HTMLElement,
  popupConfig: AuthConfig,
  sendMessage: (message: unknown) => Promise<unknown>,
  fetchProtectedApi: () => Promise<unknown>,
  updateOptions: {
    currentVersion: string;
    fetchUpdateManifest: () => Promise<UpdateManifest>;
  }
): Promise<void> {
  const response = await sendMessage({ type: "auth:get-state" });
  if (!isAuthResponseMessage(response) || !response.ok || response.type !== "auth:state") {
    renderLoggedOut(root, "认证状态读取失败");
    return;
  }

  if (!response.value.isAuthenticated) {
    renderLoggedOut(root, response.value.lastError);
    root
      .querySelector('[data-popup-sign-in="button"]')
      ?.addEventListener("click", () => {
        void runAuthAction(root, popupConfig, sendMessage, {
          actionMessage: { type: "auth:sign-in" },
          fetchProtectedApi,
          updateOptions
        });
      });
    return;
  }

  renderLoggedIn(root, response.value);
  void runUpdateCheck(root, sendMessage, updateOptions);
  root
    .querySelector('[data-popup-sign-out="button"]')
    ?.addEventListener("click", () => {
        void runAuthAction(root, popupConfig, sendMessage, {
          actionMessage: { type: "auth:sign-out" },
          fetchProtectedApi,
          updateOptions
        });
    });
  if (popupConfig.enableDevAuthPanel) {
    renderDevPanel(root, response.value);
    root
      .querySelector('[data-popup-test-protected-api="button"]')
      ?.addEventListener("click", () => {
        void runProtectedApiProbe(root, fetchProtectedApi);
      });
  }
}

async function runAuthAction(
  root: HTMLElement,
  popupConfig: AuthConfig,
  sendMessage: (message: unknown) => Promise<unknown>,
  options: {
    actionMessage: { type: "auth:sign-in" } | { type: "auth:sign-out" };
    fetchProtectedApi: () => Promise<unknown>;
    updateOptions: {
      currentVersion: string;
      fetchUpdateManifest: () => Promise<UpdateManifest>;
    };
  }
): Promise<void> {
  const response = await sendMessage(options.actionMessage);

  if (isActionError(response)) {
    renderLoggedOut(root, response.error);
    root
      .querySelector('[data-popup-sign-in="button"]')
      ?.addEventListener("click", () => {
        void runAuthAction(root, popupConfig, sendMessage, options);
      });
    return;
  }

  await renderCurrentAuthState(
    root,
    popupConfig,
    sendMessage,
    options.fetchProtectedApi,
    options.updateOptions
  );
}

function isActionError(response: unknown): response is Extract<AuthResponseMessage, { ok: false }> {
  return (
    isAuthResponseMessage(response) &&
    !response.ok &&
    response.type === "auth:error"
  );
}

async function runUpdateCheck(
  root: HTMLElement,
  sendMessage: (message: unknown) => Promise<unknown>,
  options: {
    currentVersion: string;
    fetchUpdateManifest: () => Promise<UpdateManifest>;
  }
): Promise<void> {
  renderUpdateStatus(root, {
    currentVersion: options.currentVersion,
    status: "checking"
  });

  try {
    const manifest = await options.fetchUpdateManifest();
    if (compareExtensionVersions(manifest.latestVersion, options.currentVersion) <= 0) {
      renderUpdateStatus(root, {
        currentVersion: options.currentVersion,
        status: "latest"
      });
      return;
    }

    renderUpdateStatus(root, {
      currentVersion: options.currentVersion,
      manifest,
      status: "available"
    });
    bindUpdateDownloadButtons(root, sendMessage, manifest);
  } catch {
    renderUpdateStatus(root, {
      currentVersion: options.currentVersion,
      status: "error"
    });
  }
}

function bindUpdateDownloadButtons(
  root: HTMLElement,
  sendMessage: (message: unknown) => Promise<unknown>,
  manifest: UpdateManifest
): void {
  root
    .querySelector('[data-popup-download-update="button"]')
    ?.addEventListener("click", () => {
      void downloadUpdateAsset(root, sendMessage, {
        filename: "star-chart-search-enhancer-internal.zip",
        url: manifest.zipUrl
      });
    });

  root
    .querySelector('[data-popup-download-guide="button"]')
    ?.addEventListener("click", () => {
      void downloadUpdateAsset(root, sendMessage, {
        filename: "星图增强插件-超简单安装使用指南.pdf",
        url: manifest.guideUrl
      });
    });
}

async function downloadUpdateAsset(
  root: HTMLElement,
  sendMessage: (message: unknown) => Promise<unknown>,
  options: {
    filename: string;
    url: string;
  }
): Promise<void> {
  setUpdateDownloadStatus(root, "正在下载...");
  try {
    await sendMessage({
      filename: options.filename,
      type: "update:download",
      url: options.url
    });
    setUpdateDownloadStatus(root, "已触发下载。下载后请解压新版 zip，并在 chrome://extensions 里重新加载插件。");
  } catch (error) {
    setUpdateDownloadStatus(
      root,
      error instanceof Error ? error.message : "下载失败，请稍后重试"
    );
  }
}

function readCurrentVersion(): string {
  const runtime = (
    globalThis as typeof globalThis & {
      chrome?: {
        runtime?: {
          getManifest?: () => { version?: string };
        };
      };
    }
  ).chrome?.runtime;

  return runtime?.getManifest?.().version ?? "0.0.0";
}

async function runProtectedApiProbe(
  root: HTMLElement,
  fetchProtectedApi: () => Promise<unknown>
): Promise<void> {
  setProtectedApiResult(root, "请求中...");

  try {
    const result = await fetchProtectedApi();
    setProtectedApiResult(root, JSON.stringify(result, null, 2));
  } catch (error) {
    setProtectedApiResult(
      root,
      error instanceof Error ? error.message : String(error)
    );
  }
}

if (typeof document !== "undefined") {
  void bootPopup();
}