import assert from "node:assert/strict";
import { createServer } from "node:http";
import { readFile } from "node:fs/promises";
import path from "node:path";
import test from "node:test";
import { fileURLToPath } from "node:url";

import { chromium } from "playwright";

const webRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const defaultCredentials = Object.freeze({
  username: "admin",
  password: "hwlab2026"
});

test("left activity rail resize is controlled, clamped, persisted, and disabled while collapsed", async () => {
  const server = await startStaticServer(webRoot);
  const browser = await chromium.launch({ headless: true });
  try {
    const page = await browser.newPage({
      viewport: { width: 1366, height: 768 },
      deviceScaleFactor: 1
    });
    await page.goto(server.url, { waitUntil: "domcontentloaded", timeout: 15000 });
    await login(page);
    await page.locator("#left-sidebar-resize").waitFor({ state: "visible", timeout: 12000 });

    const before = await sidebarMetrics(page);
    assert.equal(before.handle.role, "separator");
    assert.equal(before.handle.ariaLabel, "拖拽调整左侧导航宽度");
    assert.match(before.handle.title, /左右方向键/);
    assert.equal(before.handle.tabIndex, 0);
    assert.equal(before.handle.ariaDisabled, "false");
    assert.equal(before.handle.ariaHidden, "false");
    assert.equal(before.railWidth, 92);
    assert.equal(before.handle.min, 72);
    assert.equal(before.handle.max, 180);
    assert.equal(before.keyTargetsReachable, true);

    await dragLeftResize(page, before.railWidth + 48);
    const afterDrag = await sidebarMetrics(page);
    assert.ok(afterDrag.railWidth >= before.railWidth + 40, `rail width did not grow: ${afterDrag.railWidth}`);
    assert.ok(afterDrag.centerWidth <= before.centerWidth - 40, `center width did not shrink: ${afterDrag.centerWidth}`);
    assert.equal(afterDrag.storage.leftSidebarWidth, afterDrag.railWidth);
    assert.equal(afterDrag.keyTargetsReachable, true);
    assert.equal(afterDrag.noHorizontalOverflow, true);
    assert.equal(afterDrag.rootScrollLocked, true);

    await page.locator("#left-sidebar-resize").press("End");
    const afterEnd = await sidebarMetrics(page);
    assert.equal(afterEnd.railWidth, afterEnd.handle.max);
    assert.equal(afterEnd.keyTargetsReachable, true);

    await dragLeftResize(page, 999);
    const afterOverMaxDrag = await sidebarMetrics(page);
    assert.equal(afterOverMaxDrag.railWidth, afterOverMaxDrag.handle.max);

    await page.locator("#left-sidebar-resize").press("Home");
    const afterHome = await sidebarMetrics(page);
    assert.equal(afterHome.railWidth, afterHome.handle.min);
    assert.equal(afterHome.keyTargetsReachable, true);

    await dragLeftResize(page, 10);
    const afterUnderMinDrag = await sidebarMetrics(page);
    assert.equal(afterUnderMinDrag.railWidth, afterUnderMinDrag.handle.min);

    await page.locator("#left-sidebar-resize").press("ArrowRight");
    const afterArrowRight = await sidebarMetrics(page);
    assert.equal(afterArrowRight.railWidth, afterUnderMinDrag.railWidth + 8);

    await page.locator("#left-sidebar-resize").press("ArrowLeft");
    const afterArrowLeft = await sidebarMetrics(page);
    assert.equal(afterArrowLeft.railWidth, afterUnderMinDrag.railWidth);

    await page.reload({ waitUntil: "domcontentloaded", timeout: 15000 });
    await page.locator("#left-sidebar-resize").waitFor({ state: "visible", timeout: 12000 });
    const restored = await sidebarMetrics(page);
    assert.equal(restored.railWidth, afterArrowLeft.railWidth);
    assert.equal(restored.storage.leftSidebarWidth, afterArrowLeft.railWidth);

    await page.locator("#left-sidebar-toggle").click();
    const collapsed = await sidebarMetrics(page);
    assert.equal(collapsed.collapsed, true);
    assert.equal(collapsed.railWidth, 44);
    assert.equal(collapsed.handle.display, "none");
    assert.equal(collapsed.handle.tabIndex, -1);
    assert.equal(collapsed.handle.ariaDisabled, "true");
    assert.equal(collapsed.handle.ariaHidden, "true");
    assert.equal(collapsed.keyTargetsReachable, true);

    await page.locator("#left-sidebar-toggle").click();
    const expandedAgain = await sidebarMetrics(page);
    assert.equal(expandedAgain.collapsed, false);
    assert.equal(expandedAgain.railWidth, afterArrowLeft.railWidth);
    assert.equal(expandedAgain.handle.tabIndex, 0);
    assert.equal(expandedAgain.keyTargetsReachable, true);

    await page.close();
  } finally {
    await browser.close();
    await server.close();
  }
});

test("left resize handle is disabled on narrow and mobile workbench layouts", async () => {
  const server = await startStaticServer(webRoot);
  const browser = await chromium.launch({ headless: true });
  try {
    for (const viewport of [
      { width: 1024, height: 768, isMobile: false },
      { width: 390, height: 844, isMobile: true }
    ]) {
      const page = await browser.newPage({
        viewport: { width: viewport.width, height: viewport.height },
        deviceScaleFactor: 1,
        isMobile: viewport.isMobile
      });
      await page.goto(server.url, { waitUntil: "domcontentloaded", timeout: 15000 });
      await login(page);
      const metrics = await sidebarMetrics(page);
      assert.equal(metrics.handle.display, "none", `${viewport.width}x${viewport.height} handle display`);
      assert.equal(metrics.handle.tabIndex, -1, `${viewport.width}x${viewport.height} tabindex`);
      assert.equal(metrics.handle.ariaDisabled, "true", `${viewport.width}x${viewport.height} aria-disabled`);
      assert.equal(metrics.handle.ariaHidden, "true", `${viewport.width}x${viewport.height} aria-hidden`);
      assert.equal(metrics.disabledTargetsReachable, true, `${viewport.width}x${viewport.height} workbench areas`);
      assert.equal(metrics.noHorizontalOverflow, true, `${viewport.width}x${viewport.height} overflow`);
      await page.close();
    }
  } finally {
    await browser.close();
    await server.close();
  }
});

async function login(page) {
  await page.waitForSelector("#login-shell, [data-app-shell]", { timeout: 12000 });
  const loginVisible = await page.locator("#login-shell").isVisible().catch(() => false);
  if (!loginVisible) {
    await page.waitForFunction(() => document.body.dataset.authState === "authenticated", null, { timeout: 12000 });
    return;
  }
  await page.locator("#login-username").fill(defaultCredentials.username);
  await page.locator("#login-password").fill(defaultCredentials.password);
  await page.locator("#login-submit").click();
  await page.waitForFunction(() => document.body.dataset.authState === "authenticated", null, { timeout: 12000 });
}

async function dragLeftResize(page, targetWidth) {
  const start = await page.evaluate(() => {
    const rail = document.querySelector("#activity-rail");
    const handle = document.querySelector("#left-sidebar-resize");
    const railBox = rail.getBoundingClientRect();
    const handleBox = handle.getBoundingClientRect();
    return {
      currentWidth: railBox.width,
      x: handleBox.left + handleBox.width / 2,
      y: handleBox.top + Math.min(80, handleBox.height / 2)
    };
  });
  await page.mouse.move(start.x, start.y);
  await page.mouse.down();
  await page.mouse.move(start.x + targetWidth - start.currentWidth, start.y, { steps: 8 });
  await page.mouse.up();
}

async function sidebarMetrics(page) {
  return page.evaluate(() => {
    const shell = document.querySelector("[data-app-shell]");
    const rail = document.querySelector("#activity-rail");
    const center = document.querySelector(".center-workspace");
    const right = document.querySelector("#hardware-sidebar");
    const handle = document.querySelector("#left-sidebar-resize");
    const handleStyle = getComputedStyle(handle);
    const handleBox = handle.getBoundingClientRect();
    const storage = JSON.parse(localStorage.getItem("hwlab.workbench.layout.v1") ?? "null");
    const targetSelectors = [
      "#command-input",
      "#command-send",
      ".hardware-status",
      "#hardware-list",
      "#m3-write-do",
      "#m3-read-di",
      "[data-hardware-tab='overview']",
      "[data-hardware-tab='gateways']",
      "[data-hardware-tab='box1']",
      "[data-hardware-tab='box2']",
      "[data-hardware-tab='patch']"
    ];
    const keyTargets = targetSelectors.map((selector) => inspectTargetVisibility(selector));
    const disabledTargets = ["#command-form", ".hardware-status"].map((selector) => inspectTargetVisibility(selector));
    return {
      collapsed: shell.classList.contains("is-left-sidebar-collapsed"),
      railWidth: Math.round(rail.getBoundingClientRect().width),
      centerWidth: Math.round(center.getBoundingClientRect().width),
      rightWidth: Math.round(right.getBoundingClientRect().width),
      storage,
      handle: {
        display: handleStyle.display,
        width: handleBox.width,
        role: handle.getAttribute("role"),
        ariaLabel: handle.getAttribute("aria-label"),
        title: handle.getAttribute("title"),
        tabIndex: handle.tabIndex,
        ariaDisabled: handle.getAttribute("aria-disabled"),
        ariaHidden: handle.getAttribute("aria-hidden"),
        min: Number(handle.getAttribute("aria-valuemin")),
        max: Number(handle.getAttribute("aria-valuemax")),
        now: Number(handle.getAttribute("aria-valuenow")),
        valueText: handle.getAttribute("aria-valuetext")
      },
      keyTargets,
      keyTargetsReachable: keyTargets.every((target) => target.ok),
      disabledTargets,
      disabledTargetsReachable: disabledTargets.every((target) => target.ok),
      noHorizontalOverflow:
        document.documentElement.scrollWidth <= document.documentElement.clientWidth + 2 &&
        document.body.scrollWidth <= document.body.clientWidth + 2 &&
        shell.scrollWidth <= shell.clientWidth + 2 &&
        right.scrollWidth <= right.clientWidth + 2,
      rootScrollLocked:
        getComputedStyle(document.documentElement).overflow === "hidden" &&
        getComputedStyle(document.body).overflow === "hidden" &&
        document.documentElement.scrollHeight <= document.documentElement.clientHeight + 2 &&
        document.body.scrollHeight <= document.body.clientHeight + 2
    };

    function inspectTargetVisibility(selector) {
      const element = document.querySelector(selector);
      if (!element) return { selector, ok: false, missing: true };
      scrollIntoNearestContainer(element);
      const box = element.getBoundingClientRect();
      const clip = clipBoxFor(element);
      const visibleBox = {
        left: Math.max(box.left, clip.left),
        top: Math.max(box.top, clip.top),
        right: Math.min(box.right, clip.right),
        bottom: Math.min(box.bottom, clip.bottom)
      };
      const visibleWidth = Math.max(0, visibleBox.right - visibleBox.left);
      const visibleHeight = Math.max(0, visibleBox.bottom - visibleBox.top);
      const x = Math.min(Math.max(visibleBox.left + visibleWidth / 2, 0), window.innerWidth - 1);
      const y = Math.min(Math.max(visibleBox.top + Math.min(visibleHeight / 2, 32), 0), window.innerHeight - 1);
      const stack = document.elementsFromPoint(x, y);
      const visible = box.width > 0 && box.height > 0 && visibleWidth > 0 && visibleHeight > 0;
      return {
        selector,
        ok: visible && stack.some((candidate) => candidate === element || element.contains(candidate)),
        box: { left: box.left, top: box.top, right: box.right, bottom: box.bottom, width: box.width, height: box.height },
        visibleBox,
        hit: stack[0]?.id || stack[0]?.className || stack[0]?.tagName || "none"
      };
    }

    function scrollIntoNearestContainer(element) {
      const container = nearestScrollableAncestor(element);
      if (!container) {
        element.scrollIntoView({ block: "center", inline: "nearest" });
        return;
      }
      const elementBox = element.getBoundingClientRect();
      const containerBox = container.getBoundingClientRect();
      const inset = Math.max(6, Math.min(24, (container.clientHeight - Math.min(elementBox.height, container.clientHeight)) / 2));
      container.scrollTop += elementBox.top - containerBox.top - inset;
    }

    function nearestScrollableAncestor(element) {
      let current = element.parentElement;
      while (current && current !== document.documentElement) {
        const style = getComputedStyle(current);
        const scrollable = current.scrollHeight > current.clientHeight + 2 && !["visible", "clip"].includes(style.overflowY);
        if (scrollable) return current;
        current = current.parentElement;
      }
      return null;
    }

    function clipBoxFor(element) {
      let visible = {
        left: 0,
        top: 0,
        right: window.innerWidth,
        bottom: window.innerHeight
      };
      let current = element.parentElement;
      while (current && current !== document.documentElement) {
        const style = getComputedStyle(current);
        if (!["visible", "clip"].includes(style.overflow) || !["visible", "clip"].includes(style.overflowY) || !["visible", "clip"].includes(style.overflowX)) {
          const box = current.getBoundingClientRect();
          visible = {
            left: Math.max(visible.left, box.left),
            top: Math.max(visible.top, box.top),
            right: Math.min(visible.right, box.right),
            bottom: Math.min(visible.bottom, box.bottom)
          };
        }
        current = current.parentElement;
      }
      return visible;
    }
  });
}

async function startStaticServer(rootDir) {
  const server = createServer(async (request, response) => {
    try {
      const url = new URL(request.url ?? "/", "http://127.0.0.1");
      const pathname = url.pathname === "/" ? "/index.html" : url.pathname;
      const resolved = path.resolve(rootDir, `.${pathname}`);
      if (!resolved.startsWith(rootDir)) {
        response.writeHead(403).end("forbidden");
        return;
      }
      const body = await readFile(resolved);
      response.writeHead(200, { "content-type": contentType(resolved) });
      response.end(body);
    } catch {
      response.writeHead(404, { "content-type": "text/plain; charset=utf-8" });
      response.end("not found");
    }
  });
  await new Promise((resolve, reject) => {
    server.once("error", reject);
    server.listen(0, "127.0.0.1", resolve);
  });
  const address = server.address();
  return {
    url: `http://127.0.0.1:${address.port}/`,
    close: () => new Promise((resolve, reject) => server.close((error) => error ? reject(error) : resolve()))
  };
}

function contentType(filePath) {
  if (filePath.endsWith(".html")) return "text/html; charset=utf-8";
  if (filePath.endsWith(".css")) return "text/css; charset=utf-8";
  if (filePath.endsWith(".mjs") || filePath.endsWith(".js")) return "text/javascript; charset=utf-8";
  if (filePath.endsWith(".md")) return "text/markdown; charset=utf-8";
  return "application/octet-stream";
}