import {
  createMarketController,
  type CreateMarketControllerOptions
} from "./market/index";
import { renderMarketAuthGate } from "./market/auth-gate";
import {
  isAuthResponseMessage,
  type AuthStateValue
} from "../shared/auth-messages";

interface ChromeRuntimeLike {
  getURL?: (path: string) => string;
  id?: string;
  sendMessage?: (message: unknown) => void | Promise<unknown>;
}

const DOWNLOAD_MARKET_CSV_MESSAGE = "download-market-csv";

interface BootContentScriptOptions {
  createMarketController?: (
    options: CreateMarketControllerOptions
  ) => { dispose?: () => void; ready: Promise<void> };
  document?: Document;
  sendAuthMessage?: (message: unknown) => Promise<unknown>;
  window?: Window;
}

export async function bootContentScript(
  options: BootContentScriptOptions = {}
): Promise<{ ready: Promise<void> } | null> {
  const currentWindow = options.window ?? window;
  const currentDocument = options.document ?? document;
  const controllerFactory =
    options.createMarketController ?? createMarketController;
  const sendAuthMessage =
    options.sendAuthMessage ?? createRuntimeMessageSender();

  if (!isMarketPage(currentWindow.location.href)) {
    return null;
  }

  installMarketPageBridge(currentDocument);

  const authState = await readAuthState(sendAuthMessage);
  if (!authState?.isAuthenticated) {
    await waitForBodyReady(currentDocument, currentWindow);
    renderMarketAuthGate(
      currentDocument,
      currentWindow,
      isExpiredAuthState(authState) ? "登录已过期，请重新登录" : undefined
    );
    return {
      ready: Promise.resolve()
    };
  }

  await waitForBodyReady(currentDocument, currentWindow);

  return controllerFactory({
    document: currentDocument,
    onCsvReady: (csv: string, filename?: string) => {
      if (filename) {
        downloadCsv(currentDocument, currentWindow, csv, filename);
        return;
      }

      if (requestCsvDownload(csv)) {
        return;
      }

      downloadCsv(currentDocument, currentWindow, csv, filename);
    },
    window: currentWindow
  });
}

async function readAuthState(
  sendMessage: (message: unknown) => Promise<unknown>
): Promise<AuthStateValue | null> {
  const response = await sendMessage({ type: "auth:get-state" });
  if (!isAuthResponseMessage(response) || !response.ok || response.type !== "auth:state") {
    return null;
  }

  return response.value;
}

function isMarketPage(url: string): boolean {
  const parsedUrl = new URL(url);
  const isXingtuHost =
    parsedUrl.hostname === "xingtu.cn" || parsedUrl.hostname.endsWith(".xingtu.cn");

  return isXingtuHost && parsedUrl.pathname.startsWith("/ad/creator/market");
}

function bootstrapContentScript() {
  const runtime = (
    globalThis as typeof globalThis & {
      chrome?: { runtime?: ChromeRuntimeLike };
    }
  ).chrome?.runtime;

  if (!runtime || typeof window === "undefined" || typeof document === "undefined") {
    return;
  }

  const marker = "__starChartSearchEnhancerContentController";
  const scopedWindow = window as Window & {
    [marker]?: boolean | { dispose?: () => void; ready: Promise<void> } | null;
  };

  if (scopedWindow[marker]) {
    return;
  }

  scopedWindow[marker] = true;
  void bootContentScript().then((controller) => {
    scopedWindow[marker] = controller;
  });
}

bootstrapContentScript();

function requestCsvDownload(csv: string, filename?: string): boolean {
  const runtime = (
    globalThis as typeof globalThis & {
      chrome?: { runtime?: ChromeRuntimeLike };
    }
  ).chrome?.runtime;

  if (!runtime?.id || typeof runtime.sendMessage !== "function") {
    return false;
  }

  runtime.sendMessage({
    csv,
    filename: filename ?? `star-chart-search-enhancer-${formatTimestampForFilename()}.csv`,
    type: DOWNLOAD_MARKET_CSV_MESSAGE
  });
  return true;
}

function createRuntimeMessageSender(): (message: unknown) => Promise<unknown> {
  return async (message: unknown) => {
    const runtime = (
      globalThis as typeof globalThis & {
        chrome?: { runtime?: ChromeRuntimeLike };
      }
    ).chrome?.runtime;

    if (typeof runtime?.sendMessage !== "function") {
      return null;
    }

    return runtime.sendMessage(message);
  };
}

async function waitForBodyReady(document: Document, currentWindow: Window): Promise<void> {
  if (document.body) {
    return;
  }

  await new Promise<void>((resolve) => {
    const handleReady = () => {
      if (document.body) {
        document.removeEventListener("DOMContentLoaded", handleReady);
        resolve();
      }
    };

    document.addEventListener("DOMContentLoaded", handleReady);
    currentWindow.setTimeout(handleReady, 0);
  });
}

function downloadCsv(
  document: Document,
  window: Window,
  csv: string,
  filename?: string
): void {
  const blob = new Blob(["\uFEFF", csv], {
    type: "text/csv;charset=utf-8"
  });
  const objectUrl = window.URL.createObjectURL(blob);
  const link = document.createElement("a");
  link.href = objectUrl;
  link.download = filename ?? `star-chart-search-enhancer-${formatTimestampForFilename()}.csv`;
  document.body.appendChild(link);
  link.click();
  link.remove();
  window.URL.revokeObjectURL(objectUrl);
}

function formatTimestampForFilename(): string {
  return new Date().toISOString().replace(/[:.]/g, "-");
}

function isExpiredAuthState(authState: AuthStateValue | null): boolean {
  const lastError = authState?.lastError;
  return (
    typeof lastError === "string" &&
    (/token/i.test(lastError) || lastError.includes("过期"))
  );
}

function installMarketPageBridge(document: Document) {
  if (
    document.documentElement.querySelector(
      '[data-sces-market-bridge="script"]'
    )
  ) {
    return;
  }

  const script = document.createElement("script");
  script.dataset.scesMarketBridge = "script";

  const runtime = (
    globalThis as typeof globalThis & {
      chrome?: { runtime?: ChromeRuntimeLike };
    }
  ).chrome?.runtime;
  const bridgeUrl = runtime?.getURL?.("content/market-page-bridge.js");

  if (bridgeUrl) {
    script.src = bridgeUrl;
  } else {
    script.textContent = "";
  }

  (document.head ?? document.documentElement).appendChild(script);
}