import test from "node:test";
import assert from "node:assert/strict";
import { JSDOM } from "jsdom";
import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

import { getSftpBreadcrumbSegments } from "../../application/state/sftp/utils.ts";
import {
  normalizeSftpBreadcrumbMaxVisibleParts,
  resolveSftpBreadcrumbVisibleParts,
  scrollSftpBreadcrumbViewportToTail,
  shouldShowSftpBreadcrumbEllipsis,
  splitSftpBreadcrumbPinnedParts,
} from "./SftpBreadcrumb.tsx";

const breadcrumbSource = fs.readFileSync(
  path.join(path.dirname(fileURLToPath(import.meta.url)), "SftpBreadcrumb.tsx"),
  "utf8",
);

test("deep unix paths keep the first segment and trailing segments", () => {
  const { segments } = getSftpBreadcrumbSegments(
    "/var/www/apps/netcatty/releases/current/public",
  );
  const resolved = resolveSftpBreadcrumbVisibleParts({
    segments,
    maxVisibleParts: 4,
  });

  assert.equal(resolved.needsTruncation, true);
  assert.deepEqual(
    resolved.visibleParts.map((part) => part.segment.label),
    ["var", "releases", "current", "public"],
  );
  assert.deepEqual(
    resolved.hiddenParts.map((part) => part.segment.label),
    ["www", "apps", "netcatty"],
  );

  const split = splitSftpBreadcrumbPinnedParts(resolved.visibleParts);
  assert.equal(split.leadingPart?.segment.label, "var");
  assert.deepEqual(
    split.trailingParts.map((part) => part.segment.label),
    ["releases", "current", "public"],
  );
});

test("windows drive paths keep the drive letter while preferring the tail", () => {
  const { segments } = getSftpBreadcrumbSegments(
    "C:\\Users\\alice\\projects\\netcatty\\src\\components",
  );
  const resolved = resolveSftpBreadcrumbVisibleParts({
    segments,
    maxVisibleParts: 4,
  });

  assert.equal(resolved.needsTruncation, true);
  assert.equal(resolved.visibleParts[0]?.segment.label, "C:");
  assert.deepEqual(
    resolved.visibleParts.slice(1).map((part) => part.segment.label),
    ["netcatty", "src", "components"],
  );
});

test("windows UNC paths keep the share root while preferring the tail", () => {
  const { segments } = getSftpBreadcrumbSegments(
    "\\\\wsl.localhost\\Ubuntu-22.04\\home\\alice\\projects\\netcatty\\src",
  );
  const resolved = resolveSftpBreadcrumbVisibleParts({
    segments,
    maxVisibleParts: 4,
  });

  assert.equal(resolved.needsTruncation, true);
  assert.equal(
    resolved.visibleParts[0]?.segment.label,
    "\\\\wsl.localhost\\Ubuntu-22.04",
  );
  assert.deepEqual(
    resolved.visibleParts.slice(1).map((part) => part.segment.label),
    ["projects", "netcatty", "src"],
  );
});

test("budget of one keeps the leading root and still exposes hidden segments via ellipsis", () => {
  assert.equal(normalizeSftpBreadcrumbMaxVisibleParts(0), 1);
  assert.equal(normalizeSftpBreadcrumbMaxVisibleParts(1.9), 1);

  const { segments } = getSftpBreadcrumbSegments(
    "C:\\Users\\alice\\projects\\netcatty\\src",
  );
  const resolved = resolveSftpBreadcrumbVisibleParts({
    segments,
    maxVisibleParts: 1,
  });

  assert.equal(resolved.needsTruncation, true);
  assert.deepEqual(
    resolved.visibleParts.map((part) => part.segment.label),
    ["C:"],
  );
  assert.ok(resolved.hiddenParts.length >= 3);
  assert.equal(
    shouldShowSftpBreadcrumbEllipsis({
      needsTruncation: resolved.needsTruncation,
      hiddenPartsCount: resolved.hiddenParts.length,
    }),
    true,
  );
  assert.deepEqual(splitSftpBreadcrumbPinnedParts(resolved.visibleParts).trailingParts, []);
});

test("breadcrumb pins leading chrome and only scrolls trailing chips", () => {
  assert.doesNotMatch(breadcrumbSource, /dir="rtl"/);
  assert.match(breadcrumbSource, /splitSftpBreadcrumbPinnedParts/);
  assert.match(breadcrumbSource, /shouldShowSftpBreadcrumbEllipsis/);
  assert.match(breadcrumbSource, /scrollSftpBreadcrumbViewportToTail/);
  assert.match(breadcrumbSource, /shrink-0/);
  assert.match(breadcrumbSource, /flex-1 overflow-hidden/);

  const calls: Array<{ left: number }> = [];
  const viewport = {
    scrollWidth: 400,
    clientWidth: 120,
    set scrollLeft(value: number) {
      calls.push({ left: value });
    },
    get scrollLeft() {
      return calls.at(-1)?.left ?? 0;
    },
  } as HTMLElement;

  scrollSftpBreadcrumbViewportToTail(viewport);
  assert.deepEqual(calls, [{ left: 280 }]);

  const shortCalls: number[] = [];
  scrollSftpBreadcrumbViewportToTail({
    scrollWidth: 100,
    clientWidth: 120,
    set scrollLeft(value: number) {
      shortCalls.push(value);
    },
    get scrollLeft() {
      return shortCalls.at(-1) ?? 0;
    },
  } as HTMLElement);
  assert.deepEqual(shortCalls, [0]);
});

test("breadcrumb root button navigates to the filesystem root", async () => {
  const dom = new JSDOM('<!doctype html><html><body><div id="root"></div></body></html>', {
    pretendToBeVisual: true,
    url: "http://localhost",
  });
  const window = dom.window;
  const previousGlobals = new Map<string, PropertyDescriptor | undefined>();
  const installGlobal = (key: string, value: unknown) => {
    previousGlobals.set(key, Object.getOwnPropertyDescriptor(globalThis, key));
    Object.defineProperty(globalThis, key, {
      configurable: true,
      writable: true,
      value,
    });
  };

  class ResizeObserverStub {
    observe() {}
    unobserve() {}
    disconnect() {}
  }

  installGlobal("window", window);
  installGlobal("document", window.document);
  installGlobal("navigator", window.navigator);
  installGlobal("HTMLElement", window.HTMLElement);
  installGlobal("Element", window.Element);
  installGlobal("SVGElement", window.SVGElement);
  installGlobal("Node", window.Node);
  installGlobal("NodeFilter", window.NodeFilter);
  installGlobal("MutationObserver", window.MutationObserver);
  installGlobal("CustomEvent", window.CustomEvent);
  installGlobal("Event", window.Event);
  installGlobal("getComputedStyle", window.getComputedStyle.bind(window));
  installGlobal("requestAnimationFrame", window.requestAnimationFrame.bind(window));
  installGlobal("cancelAnimationFrame", window.cancelAnimationFrame.bind(window));
  installGlobal("ResizeObserver", ResizeObserverStub);
  installGlobal("IS_REACT_ACT_ENVIRONMENT", true);

  const { default: React, act } = await import("react");
  const { createRoot } = await import("react-dom/client");
  const { SftpBreadcrumb } = await import("./SftpBreadcrumb.tsx");
  const { TooltipProvider } = await import("../ui/tooltip.tsx");
  const rootNode = window.document.getElementById("root");
  assert.ok(rootNode);
  const root = createRoot(rootNode);
  const navigatedPaths: string[] = [];

  try {
    await act(async () => {
      root.render(
        React.createElement(
          TooltipProvider,
          null,
          React.createElement(SftpBreadcrumb, {
            path: "/var/www/apps",
            onNavigate: (path: string) => navigatedPaths.push(path),
            onHome: () => {},
          }),
        ),
      );
    });

    const rootButton = Array.from(window.document.querySelectorAll("button")).find(
      (button) => button.textContent === "/",
    );
    assert.ok(rootButton, "root button should be rendered next to the home button");
    assert.equal(rootButton.disabled, false);
    await act(async () => rootButton.click());

    assert.deepEqual(navigatedPaths, ["/"]);

    // A preserved double-slash POSIX path must still be able to navigate to /.
    await act(async () => {
      root.render(
        React.createElement(
          TooltipProvider,
          null,
          React.createElement(SftpBreadcrumb, {
            path: "//",
            onNavigate: (path: string) => navigatedPaths.push(path),
            onHome: () => {},
          }),
        ),
      );
    });
    const rootButtonAtDoubleSlash = Array.from(window.document.querySelectorAll("button")).find(
      (button) => button.textContent === "/",
    );
    assert.ok(rootButtonAtDoubleSlash, "root button should stay visible at //");
    assert.equal(rootButtonAtDoubleSlash.disabled, false, "// must not disable navigation to /");
    await act(async () => rootButtonAtDoubleSlash.click());
    assert.deepEqual(navigatedPaths, ["/", "/"]);

    // Already at the root: the button is disabled so it stays a no-op.
    await act(async () => {
      root.render(
        React.createElement(
          TooltipProvider,
          null,
          React.createElement(SftpBreadcrumb, {
            path: "/",
            onNavigate: (path: string) => navigatedPaths.push(path),
            onHome: () => {},
          }),
        ),
      );
    });
    const rootButtonAtRoot = Array.from(window.document.querySelectorAll("button")).find(
      (button) => button.textContent === "/",
    );
    assert.ok(rootButtonAtRoot, "root button should stay visible at /");
    assert.equal(rootButtonAtRoot.disabled, true);
    await act(async () => rootButtonAtRoot.click());
    assert.deepEqual(navigatedPaths, ["/", "/"]);
  } finally {
    await act(async () => root.unmount());
    dom.window.close();
    for (const [key, descriptor] of previousGlobals) {
      if (descriptor) Object.defineProperty(globalThis, key, descriptor);
      else delete (globalThis as Record<string, unknown>)[key];
    }
  }
});