import { expect, test, type Page } from "../support/fixtures";
import {
  blurComposerInput,
  roundTripComposerTabBeforePaint,
  composerLocator,
  enterComposerFullscreen,
  exitComposerFullscreen,
  expectComposerDraft,
  expectComposerFocused,
  expectComposerFullscreenControls,
  expectComposerNotFocused,
  expectComposerVisible,
  expectWorkspaceHeaderVisible,
  resizeComposerViewport,
  submitMessage,
  typeIntoFocusedComposer,
} from "../support/helpers/composer";
import { openAgentRoute, seedMockAgentWorkspace } from "../support/helpers/mock-agent";
import { createMockIdleAgent, openWorkspaceWithAgents } from "../support/helpers/archive-tab";
import { seedWorkspace } from "../support/helpers/seed-client";
import {
  closeMobileAgentSidebar,
  closeMobileExplorer,
  expectMobileAgentSidebarHidden,
  expectMobileAgentSidebarVisible,
  expectMobileExplorerHidden,
  expectMobileExplorerVisible,
  swipeOpenMobileAgentSidebar,
  swipeOpenMobileExplorer,
} from "../support/helpers/sidebar";
import { readScrollMetrics } from "../support/helpers/agent-bottom-anchor";
import {
  expectTimelinePromptPositionPreserved,
  rememberTimelinePromptPosition,
  seedLongMockAgentTimeline,
  waitForTimelineGeometryToSettle,
} from "../support/helpers/timeline-pagination";

test("clicking chat text or background focuses the feed for keyboard paging", async ({
  page,
}, testInfo) => {
  const agent = await seedLongMockAgentTimeline({ turns: 8 });

  try {
    await openAgentRoute(page, agent);
    const composer = composerLocator(page);
    const feed = page.getByTestId("agent-chat-scroll").filter({ visible: true });
    await composer.fill("Keep this draft");
    await feed.getByText(agent.newestPrompt, { exact: true }).click();
    await expect(feed).toBeFocused();

    const beforePaging = await readScrollMetrics(page);
    expect(beforePaging.offsetY).toBeGreaterThan(beforePaging.viewportHeight);
    await page.keyboard.press("PageUp");
    await expect
      .poll(async () => (await readScrollMetrics(page)).offsetY)
      .toBeLessThan(beforePaging.offsetY - beforePaging.viewportHeight / 2);
    await page.screenshot({ path: testInfo.outputPath("chat-keyboard-paging.png") });
    await page.keyboard.press("PageDown");
    await expect
      .poll(async () => (await readScrollMetrics(page)).distanceFromBottom)
      .toBeLessThanOrEqual(2);

    await composer.click();
    await expectComposerFocused(page);
    await feed.click({ position: { x: 2, y: 40 } });
    await expect(feed).toBeFocused();
    await page.keyboard.press("PageUp");
    await expect
      .poll(async () => (await readScrollMetrics(page)).distanceFromBottom)
      .toBeGreaterThan(beforePaging.viewportHeight / 2);
    await waitForTimelineGeometryToSettle(page);
    const readingPrompt = agent.prompts[4];
    await expect(feed.getByText(readingPrompt, { exact: true })).toBeInViewport();
    const readingPosition = await rememberTimelinePromptPosition(page, readingPrompt);
    await agent.client.sendAgentMessage(agent.agentId, "emit 2 coalesced agent stream updates");
    await agent.client.waitForFinish(agent.agentId, 15_000);
    // The daemon finishing does not mean its response has reached the browser.
    await expect(feed.getByText(/stress-update-1/)).toHaveCount(1);
    await waitForTimelineGeometryToSettle(page);
    await expectTimelinePromptPositionPreserved(page, readingPosition);
    await expectComposerDraft(page, "Keep this draft");
  } finally {
    await agent.cleanup();
  }
});

test("focusing the feed preserves assistant text selection and code copy controls", async ({
  page,
  context,
}) => {
  const sentence = "Select this assistant sentence.";
  const agent = await seedMockAgentWorkspace({
    repoPrefix: "chat-focus-selection-",
    title: "Chat focus selection",
    initialPrompt: "Render text and code.",
    featureValues: {
      mockAssistantResponse: `${sentence}\n\n\`\`\`bash\necho example\n\`\`\``,
    },
  });

  try {
    await context.grantPermissions(["clipboard-read", "clipboard-write"]);
    await agent.client.waitForFinish(agent.agentId, 15_000);
    await openAgentRoute(page, agent);
    await composerLocator(page).fill("Keep this draft");

    const feed = page.getByTestId("agent-chat-scroll").filter({ visible: true });
    await feed.getByText(sentence, { exact: true }).click({ clickCount: 3 });
    await expect(feed).toBeFocused();
    expect(await page.evaluate(() => window.getSelection()?.toString().trim())).toBe(sentence);
    await page.keyboard.press("ControlOrMeta+c");
    expect((await page.evaluate(() => navigator.clipboard.readText())).trim()).toBe(sentence);

    const code = feed.locator('[data-paseo-markdown-language="bash"]');
    await code.hover();
    await code.locator("[data-paseo-markdown-ignore]").click();
    await expect(feed).not.toBeFocused();
    expect(await page.evaluate(() => navigator.clipboard.readText())).toBe("echo example");
    await expectComposerDraft(page, "Keep this draft");
  } finally {
    await agent.cleanup();
  }
});

test("submitting a message leaves the composer ready for the next message", async ({ page }) => {
  const agent = await seedMockAgentWorkspace({
    repoPrefix: "composer-focus-",
    title: "Composer focus",
  });

  try {
    await openAgentRoute(page, agent);
    await expectComposerVisible(page);

    await submitMessage(page, "First message");
    await expectComposerFocused(page);

    await typeIntoFocusedComposer(page, "Second message");
    await expectComposerDraft(page, "Second message");
  } finally {
    await agent.cleanup();
  }
});

test("opening an agent focuses the composer when a mouse drives the UI", async ({ page }) => {
  const agent = await seedMockAgentWorkspace({
    repoPrefix: "composer-focus-open-",
    title: "Composer focus on open",
  });

  try {
    await openAgentRoute(page, agent);
    await expectComposerFocused(page);
  } finally {
    await agent.cleanup();
  }
});

async function waitForAnimationFrames(page: Page, count: number): Promise<void> {
  await page.evaluate(async (frames) => {
    for (let frame = 0; frame < frames; frame += 1) {
      await new Promise((resolve) => requestAnimationFrame(resolve));
    }
  }, count);
}

test.describe("touch screen wide enough for the desktop layout", () => {
  // A tablet or an unfolded foldable gets the desktop layout, but focusing the
  // composer there raises the on-screen keyboard over the conversation.
  test.use({ viewport: { width: 1024, height: 768 }, isMobile: true, hasTouch: true });

  test("remounting an inline composer does not restore focus on touch", async ({ page }) => {
    const agent = await seedMockAgentWorkspace({
      repoPrefix: "composer-touch-remount-",
      title: "Touch remount",
    });
    try {
      await openAgentRoute(page, agent);
      await composerLocator(page).fill("Keep this draft through resize");
      await expectComposerFocused(page);
      await resizeComposerViewport(page, "portrait");
      await expectComposerDraft(page, "Keep this draft through resize");
      await expectComposerNotFocused(page);
      await composerLocator(page).tap();
      await expectComposerFocused(page);
    } finally {
      await agent.cleanup();
    }
  });

  test("returning to an inactive inline composer does not restore focus on touch", async ({
    page,
  }) => {
    const workspace = await seedWorkspace({ repoPrefix: "composer-touch-retained-" });
    try {
      const first = await createMockIdleAgent(workspace.client, {
        cwd: workspace.repoPath,
        workspaceId: workspace.workspaceId,
        title: "First touch chat",
      });
      const second = await createMockIdleAgent(workspace.client, {
        cwd: workspace.repoPath,
        workspaceId: workspace.workspaceId,
        title: "Second touch chat",
      });
      await openWorkspaceWithAgents(page, [first, second]);
      // Repeat after an explicit edit so retained focus from an earlier visit is
      // also dismissed when the same mounted editor becomes inactive again.
      for (const draft of ["Keep this touch draft", "Edit this touch draft again"]) {
        await composerLocator(page).fill(draft);
        await expectComposerFocused(page);
        // An external keyboard changes tabs without a pointer click blurring the
        // editor first. The device still has a touch-primary focus policy.
        await roundTripComposerTabBeforePaint(page, "Second touch chat");
        await expectComposerDraft(page, draft);
        await expectComposerNotFocused(page);
        await composerLocator(page).tap();
        await expectComposerFocused(page);
        await typeIntoFocusedComposer(page, " after return");
        await expectComposerDraft(page, `${draft} after return`);
      }
    } finally {
      await workspace.cleanup();
    }
  });

  test("opening an agent leaves the composer unfocused", async ({ page }) => {
    const agent = await seedMockAgentWorkspace({
      repoPrefix: "composer-focus-touch-",
      title: "Composer focus on touch",
    });

    try {
      await openAgentRoute(page, agent);
      await expectComposerVisible(page);
      expect(
        await page.evaluate(() => window.matchMedia("(hover: hover) and (pointer: fine)").matches),
      ).toBe(false);
      // Autofocus makes its first attempt on the next animation frame.
      await waitForAnimationFrames(page, 4);
      await expectComposerNotFocused(page);
    } finally {
      await agent.cleanup();
    }
  });
});

const COMPACT_PANELS = [
  {
    name: "agent list",
    open: swipeOpenMobileAgentSidebar,
    expectOpen: expectMobileAgentSidebarVisible,
    close: closeMobileAgentSidebar,
    expectClosed: expectMobileAgentSidebarHidden,
  },
  {
    name: "Explorer",
    open: swipeOpenMobileExplorer,
    expectOpen: expectMobileExplorerVisible,
    close: closeMobileExplorer,
    expectClosed: expectMobileExplorerHidden,
  },
] as const;

for (const panel of COMPACT_PANELS) {
  test(`closing the compact ${panel.name} does not restore composer focus`, async ({ page }) => {
    const agent = await seedMockAgentWorkspace({
      repoPrefix: "composer-focus-panel-",
      title: `Composer focus under ${panel.name}`,
    });
    const draft = "Line one\nLine two\nLine three";
    try {
      await resizeComposerViewport(page, "portrait");
      await openAgentRoute(page, agent);
      await expectComposerVisible(page);

      await test.step("an untouched editor stays untouched", async () => {
        await expectComposerNotFocused(page);
        await panel.open(page);
        await panel.expectOpen(page);
        await panel.close(page);
        await panel.expectClosed(page);
        await expectComposerNotFocused(page);
      });

      await test.step("an inline editor blurred under the panel stays blurred", async () => {
        await composerLocator(page).fill(draft);
        await composerLocator(page).click();
        await expectComposerFocused(page);
        await panel.open(page);
        await panel.expectOpen(page);
        await blurComposerInput(page);
        await panel.close(page);
        await panel.expectClosed(page);
        await expectComposerNotFocused(page);
        await expectComposerDraft(page, draft);
      });

      await test.step("a fullscreen editor blurred under the panel stays blurred", async () => {
        await composerLocator(page).click();
        await enterComposerFullscreen(page);
        await expectComposerFullscreenControls(page);
        await expectComposerFocused(page);
        await panel.open(page);
        await panel.expectOpen(page);
        await blurComposerInput(page);
        await panel.close(page);
        await panel.expectClosed(page);
        await expectComposerNotFocused(page);
        await expectComposerFullscreenControls(page);
        await expectComposerDraft(page, draft);
        await exitComposerFullscreen(page);
        await expectWorkspaceHeaderVisible(page);
      });
    } finally {
      await agent.cleanup();
    }
  });
}