/**
 * embed-session.ts 浏览上下文隔离单测。
 *   npx esbuild src/core/embed/embed-session.test.ts --bundle --format=esm \
 *     --platform=node --outfile=.tmp-tests/embed-session.test.mjs
 *   node --test .tmp-tests/embed-session.test.mjs
 */
import assert from "node:assert/strict";
import test from "node:test";

import {
  isChromeHidden,
  isEmbedActive,
  isIsolatedSession,
  readEmbedSession,
  syncEmbedSessionFromSearch,
} from "./embed-session";

class MemoryStorage {
  #map = new Map<string, string>();
  getItem(key: string): string | null {
    return this.#map.has(key) ? this.#map.get(key)! : null;
  }
  setItem(key: string, value: string): void {
    this.#map.set(key, String(value));
  }
  removeItem(key: string): void {
    this.#map.delete(key);
  }
}

type FakeWindow = {
  self: FakeWindow;
  top: FakeWindow;
  sessionStorage: MemoryStorage;
  location: { hash: string; search: string };
  __deerflowTopChromeEmbed?: boolean;
};

const originalWindow = (globalThis as { window?: unknown }).window;

function withSharedTab<T>(run: (ctx: {
  storage: MemoryStorage;
  asTop: () => void;
  asIframe: () => void;
}) => T): T {
  const storage = new MemoryStorage();
  const top = {
    sessionStorage: storage,
    location: { hash: "", search: "" },
  } as FakeWindow;
  top.self = top;
  top.top = top;
  const iframe = {
    sessionStorage: storage,
    location: { hash: "#/login/guest?embed=1&theme=blue&hideJump=0", search: "" },
  } as FakeWindow;
  iframe.self = iframe;
  iframe.top = top;

  const asTop = () => {
    (globalThis as { window: FakeWindow }).window = top;
  };
  const asIframe = () => {
    (globalThis as { window: FakeWindow }).window = iframe;
  };

  asTop();
  try {
    return run({ storage, asTop, asIframe });
  } finally {
    if (originalWindow === undefined) {
      delete (globalThis as { window?: unknown }).window;
    } else {
      (globalThis as { window: unknown }).window = originalWindow;
    }
  }
}

test("nested embed=1 does not hide chrome on the same-origin top window", () => {
  withSharedTab(({ storage, asTop, asIframe }) => {
    asTop();
    syncEmbedSessionFromSearch("");
    assert.equal(isEmbedActive(), false);

    asIframe();
    syncEmbedSessionFromSearch("?embed=1&theme=blue&hideJump=0");
    assert.equal(isEmbedActive(), true);
    assert.ok(storage.getItem("embed.session.nested"));

    asTop();
    assert.equal(isEmbedActive(), false);
    assert.equal(isChromeHidden(), false);
  });
});

test("top ignores old nested embed.session without clearing it", () => {
  withSharedTab(({ storage, asTop }) => {
    asTop();
    storage.setItem(
      "embed.session",
      JSON.stringify({
        embed: true,
        theme: "light",
        hideJump: false,
        hideHeader: false,
        hideChrome: false,
        isolate: false,
      }),
    );
    assert.equal(isEmbedActive(), false);
    assert.equal(isChromeHidden(), false);
    // 内层老版仍要读到 embed=true
    assert.equal(JSON.parse(storage.getItem("embed.session") || "{}").embed, true);
  });
});

test("top sync does not wipe unowned embed.session", () => {
  withSharedTab(({ storage, asTop }) => {
    asTop();
    storage.setItem(
      "embed.session",
      JSON.stringify({
        embed: true,
        theme: "light",
        hideJump: false,
        hideHeader: false,
        hideChrome: false,
        isolate: false,
      }),
    );
    syncEmbedSessionFromSearch("");
    assert.equal(isEmbedActive(), false);
    assert.equal(JSON.parse(storage.getItem("embed.session") || "{}").embed, true);
  });
});

test("nested iframe leaves the shared embed.session for old inner pages", () => {
  withSharedTab(({ storage, asTop, asIframe }) => {
    asTop();
    storage.setItem(
      "embed.session",
      JSON.stringify({
        embed: true,
        theme: "light",
        hideJump: false,
        hideHeader: false,
        hideChrome: false,
        isolate: false,
      }),
    );

    asIframe();
    syncEmbedSessionFromSearch("?embed=1");
    assert.equal(JSON.parse(storage.getItem("embed.session") || "{}").embed, true);
    assert.ok(storage.getItem("embed.session.nested"));

    asTop();
    assert.equal(isEmbedActive(), false);
  });
});

test("nested iframe keeps the top window's own embed session", () => {
  withSharedTab(({ asTop, asIframe }) => {
    asTop();
    syncEmbedSessionFromSearch("?embed=1&theme=dark");
    syncEmbedSessionFromSearch("");
    assert.equal(isEmbedActive(), true);
    assert.equal(readEmbedSession()?.topOwned, true);

    asIframe();
    syncEmbedSessionFromSearch("?embed=1");

    asTop();
    assert.equal(isEmbedActive(), true);
    assert.equal(readEmbedSession()?.theme, "dark");
  });
});

test("top ignore strips chrome in memory but keeps isolate", () => {
  withSharedTab(({ storage, asTop }) => {
    asTop();
    storage.setItem(
      "embed.session",
      JSON.stringify({
        embed: true,
        theme: "light",
        hideJump: false,
        hideHeader: false,
        hideChrome: false,
        isolate: true,
      }),
    );
    assert.equal(isEmbedActive(), false);
    assert.equal(isIsolatedSession(), true);
    assert.equal(JSON.parse(storage.getItem("embed.session") || "{}").embed, true);
  });
});