import { writeFile } from "node:fs/promises";
import path from "node:path";
import { expect, test } from "../support/fixtures";
import {
  collapseFolder,
  expandFolder,
  expectExplorerEntryHidden,
  expectExplorerEntryVisible,
  expectFileTabOpen,
  openFileExplorer,
  openFileFromExplorer,
} from "../support/helpers/file-explorer";
import { delayDirectoryListingResponse } from "../support/helpers/directory-listing-gate";
import { gotoWorkspace } from "../support/helpers/launcher";
import { seedWorkspace, type SeededWorkspace } from "../support/helpers/seed-client";

let workspace: SeededWorkspace;

test.beforeAll(async () => {
  workspace = await seedWorkspace({
    repoPrefix: "file-explorer-collapse-",
    repo: {
      files: [
        { path: "assets/logo.png", content: "image bytes for explorer e2e\n" },
        { path: "docs/guide.md", content: "# Guide\n" },
      ],
    },
  });
});

test.afterAll(async () => {
  await workspace?.cleanup();
});

test.describe("File explorer collapse", () => {
  test("collapses an opened image file parent folder and still expands other folders", async ({
    page,
  }) => {
    await gotoWorkspace(page, workspace.workspaceId);
    await openFileExplorer(page);

    await expandFolder(page, "assets");
    await expectExplorerEntryVisible(page, "logo.png");

    await openFileFromExplorer(page, "logo.png");
    await expectFileTabOpen(page, "assets/logo.png");

    await collapseFolder(page, "assets");
    await expectExplorerEntryHidden(page, "logo.png");

    await expandFolder(page, "docs");
    await expectExplorerEntryVisible(page, "guide.md");
  });
});

test("Files Refresh reveals new files when a cached collapsed folder is reopened", async ({
  page,
}) => {
  await gotoWorkspace(page, workspace.workspaceId);
  await openFileExplorer(page);
  await expandFolder(page, "docs");
  await expectExplorerEntryVisible(page, "guide.md");
  await collapseFolder(page, "docs");
  await expectExplorerEntryHidden(page, "guide.md");
  await createFileOutsidePaseo("docs/NEW.md");
  await refreshFiles(page);
  await expandFolder(page, "docs");
  await expectExplorerEntryVisible(page, "guide.md");
  await expectExplorerEntryVisible(page, "NEW.md");

  await createFileOutsidePaseo("docs/NEXT.md");
  await refreshFiles(page);
  await expectExplorerEntryVisible(page, "NEXT.md");
});

async function refreshFiles(page: import("@playwright/test").Page): Promise<void> {
  const refresh = page.getByRole("button", { name: "Refresh files", exact: true });
  await refresh.click();
  await expect(refresh).toBeEnabled();
}

async function createFileOutsidePaseo(filePath: string): Promise<void> {
  await writeFile(path.join(workspace.repoPath, filePath), "# New output\n");
}

test("Files Refresh ignores an old reply for a folder collapsed while loading", async ({
  page,
}) => {
  const reply = await delayDirectoryListingResponse(page, "docs");
  await gotoWorkspace(page, workspace.workspaceId);
  await openFileExplorer(page);
  await expandFolder(page, "docs");
  await reply.waitUntilHeld();
  await collapseFolder(page, "docs");
  await createFileOutsidePaseo("docs/DELAYED.md");
  await refreshFiles(page);
  await reply.release();
  await expandFolder(page, "docs");
  await expectExplorerEntryVisible(page, "DELAYED.md");
});

test("Files Refresh preserves expanded folders while their saved view is restoring", async ({
  page,
}) => {
  await gotoWorkspace(page, workspace.workspaceId);
  await openFileExplorer(page);
  await expandFolder(page, "docs");
  await expectExplorerEntryVisible(page, "guide.md");
  const reply = await delayDirectoryListingResponse(page, "docs");
  await page.reload();
  await openFileExplorer(page);
  await reply.waitUntilHeld();
  await refreshFiles(page);
  await expectExplorerEntryVisible(page, "guide.md");
  await reply.release();
  await expectExplorerEntryVisible(page, "guide.md");
});