import { afterAll, beforeEach, describe, expect, test } from 'bun:test';
import { getDefaultTheme } from '@/lib/theme/themes';
import type { Theme } from '@/types/theme';
import {
  buildEmbeddedSessionChatURL,
  getOrCreateEmbeddedSessionChatURL,
  getEmbeddedSessionChatOriginSessionId,
  isEmbeddedSessionChat,
  resetEmbeddedSessionChatCache,
  type EmbeddedSessionChatURLCacheEntry,
} from './contextPanelEmbeddedChat';

const originalWindow = globalThis.window;

const installWindowLocation = (href = 'http://127.0.0.1:5173/app') => {
  const url = new URL(href);
  Object.defineProperty(globalThis, 'window', {
    configurable: true,
    value: {
      location: {
        href: url.toString(),
        origin: url.origin,
        pathname: url.pathname,
        search: url.search,
      },
    },
  });
};

const makeTheme = (id: string, variant: 'light' | 'dark'): Theme => ({
  ...getDefaultTheme(variant === 'dark'),
  metadata: {
    ...getDefaultTheme(variant === 'dark').metadata,
    id,
    name: id,
    variant,
  },
});

beforeEach(() => {
  installWindowLocation();
  resetEmbeddedSessionChatCache();
});

afterAll(() => {
  Object.defineProperty(globalThis, 'window', {
    configurable: true,
    value: originalWindow,
  });
});

describe('embedded session chat URL', () => {
  test('includes parent effective system theme bootstrap data', () => {
    const currentTheme = makeTheme('custom-dark', 'dark');

    const src = buildEmbeddedSessionChatURL('ses_1', '/repo', false, {
      mode: 'system',
      lightThemeId: 'custom-light',
      darkThemeId: 'custom-dark',
      currentTheme,
    });

    const url = new URL(src);
    expect(url.searchParams.get('ocPanel')).toBe('session-chat');
    expect(url.searchParams.get('surface')).toBe('desktop');
    expect(url.searchParams.get('themeMode')).toBe('system');
    expect(url.searchParams.get('themeVariant')).toBe('dark');
    expect(url.searchParams.get('lightThemeId')).toBe('custom-light');
    expect(url.searchParams.get('darkThemeId')).toBe('custom-dark');
    expect(JSON.parse(url.searchParams.get('currentTheme') || '{}').metadata.id).toBe('custom-dark');
  });

  test('freezes bootstrap src per tab so live theme changes do not reload iframe', () => {
    const cache = new Map<string, EmbeddedSessionChatURLCacheEntry>();
    const first = getOrCreateEmbeddedSessionChatURL(cache, 'tab-1', 'ses_1', '/repo', false, {
      mode: 'system',
      lightThemeId: 'light-a',
      darkThemeId: 'dark-a',
      currentTheme: makeTheme('dark-a', 'dark'),
    });

    const second = getOrCreateEmbeddedSessionChatURL(cache, 'tab-1', 'ses_1', '/repo', false, {
      mode: 'light',
      lightThemeId: 'light-b',
      darkThemeId: 'dark-b',
      currentTheme: makeTheme('light-b', 'light'),
    });

    expect(second).toBe(first);
    expect(new URL(second).searchParams.get('themeVariant')).toBe('dark');
  });

  test('rebuilds cached src when readOnly changes for an existing tab', () => {
    const cache = new Map<string, EmbeddedSessionChatURLCacheEntry>();
    const theme = {
      mode: 'system' as const,
      lightThemeId: 'light-a',
      darkThemeId: 'dark-a',
      currentTheme: makeTheme('dark-a', 'dark'),
    };

    const writable = getOrCreateEmbeddedSessionChatURL(cache, 'tab-1', 'ses_1', '/repo', false, theme);
    const readOnly = getOrCreateEmbeddedSessionChatURL(cache, 'tab-1', 'ses_1', '/repo', true, theme);

    expect(readOnly).not.toBe(writable);
    expect(new URL(writable).searchParams.get('readOnly')).toBeNull();
    expect(new URL(readOnly).searchParams.get('readOnly')).toBe('1');
  });
});

describe('isEmbeddedSessionChat', () => {
  test('is true only for the session-chat panel search param', () => {
    installWindowLocation('http://127.0.0.1:5173/app?ocPanel=session-chat&sessionId=ses_1');
    resetEmbeddedSessionChatCache();
    expect(isEmbeddedSessionChat()).toBe(true);

    installWindowLocation('http://127.0.0.1:5173/app?sessionId=ses_1');
    resetEmbeddedSessionChatCache();
    expect(isEmbeddedSessionChat()).toBe(false);

    installWindowLocation('http://127.0.0.1:5173/app');
    resetEmbeddedSessionChatCache();
    expect(isEmbeddedSessionChat()).toBe(false);
  });

  test('caches the first result so URL rewrites cannot flip it (mirrors VS Code stable global)', () => {
    // VS Code detects its webview via the stable `window.__VSCODE_CONFIG__`
    // global — it never changes. The embedded iframe's identity is equally
    // fixed at mount (the parent builds the src); caching the first read
    // makes detection just as stable, surviving any URL rewrite.
    installWindowLocation('http://127.0.0.1:5173/app?ocPanel=session-chat&sessionId=ses_1');
    resetEmbeddedSessionChatCache();

    // First read: caches true.
    expect(isEmbeddedSessionChat()).toBe(true);

    // Even if the URL were rewritten, the cached value stays true.
    installWindowLocation('http://127.0.0.1:5173/app?session=ses_grandchild');
    expect(isEmbeddedSessionChat()).toBe(true);

    // Still true after another rewrite.
    installWindowLocation('http://127.0.0.1:5173/app');
    expect(isEmbeddedSessionChat()).toBe(true);
  });
});

describe('getEmbeddedSessionChatOriginSessionId', () => {
  test('returns the URL sessionId when embedded', () => {
    installWindowLocation('http://127.0.0.1:5173/app?ocPanel=session-chat&sessionId=ses_child&directory=%2Frepo');
    resetEmbeddedSessionChatCache();
    expect(getEmbeddedSessionChatOriginSessionId()).toBe('ses_child');
  });

  test('returns null outside the embedded iframe', () => {
    installWindowLocation('http://127.0.0.1:5173/app?session=ses_main');
    resetEmbeddedSessionChatCache();
    expect(getEmbeddedSessionChatOriginSessionId()).toBeNull();

    installWindowLocation('http://127.0.0.1:5173/app? sessionId=ses_orphan');
    resetEmbeddedSessionChatCache();
    expect(getEmbeddedSessionChatOriginSessionId()).toBeNull();
  });

  test('returns null when embedded URL is missing sessionId param', () => {
    installWindowLocation('http://127.0.0.1:5173/app?ocPanel=session-chat&directory=%2Frepo');
    resetEmbeddedSessionChatCache();
    expect(getEmbeddedSessionChatOriginSessionId()).toBeNull();
  });

  test('trims whitespace', () => {
    installWindowLocation('http://127.0.0.1:5173/app?ocPanel=session-chat&sessionId=%20%20ses_child%20%20');
    resetEmbeddedSessionChatCache();
    expect(getEmbeddedSessionChatOriginSessionId()).toBe('ses_child');
  });
});