// Port 3204 - General mobile layout tests
import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import type { BrowserContext, Page } from 'playwright';
import type { WebServer } from '../src/web/server.js';
import { createTestServer, stopTestServer } from './helpers/server.js';
import { createDevicePage, closeAllBrowsers } from './helpers/browser.js';
import { PORTS, SELECTORS, BREAKPOINTS, BODY_CLASSES, WAIT, MIN_TOUCH_TARGET } from './helpers/constants.js';
import {
  assertFixedPosition,
  assertHidden,
  assertVisible,
  assertNoHorizontalOverflow,
  assertDeviceClasses,
  assertAccessibleTouchTargets,
  assertFontSizeNoZoom,
  assertZoomNotDisabled,
  getCSSProperty,
  getCSSNumericValue,
  assertHasClass,
  assertNotHasClass,
} from './helpers/assertions.js';
import { REPRESENTATIVE_DEVICES, DEVICE_REGISTRY, type DeviceEntry } from './devices.js';

const PORT = PORTS.LAYOUT;
const BASE_URL = `http://localhost:${PORT}`;

let server: WebServer;

// Default test device: iPhone 14 Pro (standard phone)
const iPhone14Pro = REPRESENTATIVE_DEVICES['standard-phone'];
// Desktop-class device for comparison
const iPadPro = REPRESENTATIVE_DEVICES['large-tablet'];

describe('Mobile Layout', () => {
  beforeAll(async () => {
    server = await createTestServer(PORT);
  });

  afterAll(async () => {
    await closeAllBrowsers();
    await stopTestServer(server);
  });

  // ─── Fixed Elements ──────────────────────────────────────────────────────

  describe('Fixed Elements', () => {
    let context: BrowserContext;
    let page: Page;

    beforeAll(async () => {
      ({ context, page } = await createDevicePage(iPhone14Pro, BASE_URL));
    });

    afterAll(async () => {
      await context.close();
    });

    it('header has position: fixed', async () => {
      await assertFixedPosition(page, SELECTORS.HEADER);
    });

    it('header is at top: 0', async () => {
      const top = await getCSSProperty(page, SELECTORS.HEADER, 'top');
      expect(parseFloat(top)).toBe(0);
    });

    it('header has z-index >= 200', async () => {
      const zIndex = await getCSSNumericValue(page, SELECTORS.HEADER, 'z-index');
      expect(zIndex).toBeGreaterThanOrEqual(200);
    });

    it('header has min-height: 36px', async () => {
      const minHeight = await getCSSNumericValue(page, SELECTORS.HEADER, 'min-height');
      expect(minHeight).toBeGreaterThanOrEqual(36);
    });

    it('toolbar has position: fixed', async () => {
      await assertFixedPosition(page, SELECTORS.TOOLBAR);
    });

    it('toolbar is at bottom', async () => {
      const bottom = await getCSSProperty(page, SELECTORS.TOOLBAR, 'bottom');
      // bottom should be 0px or a safe-area value (small positive)
      expect(parseFloat(bottom)).toBeLessThanOrEqual(50);
    });

    it('toolbar height is ~40px', async () => {
      const height = await getCSSNumericValue(page, SELECTORS.TOOLBAR, 'height');
      expect(height).toBeGreaterThanOrEqual(36);
      expect(height).toBeLessThanOrEqual(48);
    });
  });

  // ─── Hidden Elements on Phones ────────────────────────────────────────────

  describe('Hidden Elements on Phones', () => {
    let context: BrowserContext;
    let page: Page;

    beforeAll(async () => {
      ({ context, page } = await createDevicePage(iPhone14Pro, BASE_URL));
    });

    afterAll(async () => {
      await context.close();
    });

    const hiddenOnPhones = [
      SELECTORS.HEADER_BRAND,
      SELECTORS.CASE_SELECT_GROUP,
      SELECTORS.VERSION_DISPLAY,
      SELECTORS.TOOLBAR_RIGHT,
      SELECTORS.TAB_COUNT_GROUP,
    ];

    for (const selector of hiddenOnPhones) {
      it(`${selector} is hidden on phones`, async () => {
        await assertHidden(page, selector);
      });
    }
  });

  // ─── Mobile-Only Visible Elements ─────────────────────────────────────────

  describe('Mobile-Only Visible Elements', () => {
    it('.btn-settings-mobile visible on phones', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        await assertVisible(page, SELECTORS.SETTINGS_MOBILE);
      } finally {
        await context.close();
      }
    });

    it('.btn-case-mobile visible on phones', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        await assertVisible(page, SELECTORS.CASE_MOBILE);
      } finally {
        await context.close();
      }
    });

    it('.btn-settings-mobile hidden on desktop', async () => {
      const { context, page } = await createDevicePage(iPadPro, BASE_URL);
      try {
        await assertHidden(page, SELECTORS.SETTINGS_MOBILE);
      } finally {
        await context.close();
      }
    });
  });

  // ─── Toolbar Collision Regression ───────────────────────────────────────

  describe('Toolbar Collision Regression', () => {
    it('keeps phone toolbar controls inside the viewport', async () => {
      const device = DEVICE_REGISTRY.find((d) => d.name === 'iPhone 8')!;
      const { context, page } = await createDevicePage(device, BASE_URL, 'chromium');
      try {
        await page.waitForTimeout(WAIT.PAGE_SETTLE);
        const layout = await page.evaluate(() => {
          const buttons = [...document.querySelectorAll('.toolbar button')]
            .filter((el): el is HTMLButtonElement => {
              const rect = el.getBoundingClientRect();
              const style = getComputedStyle(el);
              return rect.width > 0 && rect.height > 0 && style.display !== 'none' && style.visibility !== 'hidden';
            })
            .map((el) => {
              const rect = el.getBoundingClientRect();
              return {
                selector: el.id ? `#${el.id}` : `.${[...el.classList].join('.')}`,
                left: rect.left,
                right: rect.right,
              };
            });
          return {
            overflow: buttons.filter(({ left, right }) => left < 0 || right > window.innerWidth),
            caseWidth: document.querySelector('.btn-case-mobile')?.getBoundingClientRect().width ?? 0,
          };
        });

        expect(layout.overflow).toEqual([]);
        expect(layout.caseWidth).toBeGreaterThanOrEqual(36);
      } finally {
        await context.close();
      }
    });

    it('does not render the desktop voice button at the 430px phone/tablet boundary', async () => {
      const device = REPRESENTATIVE_DEVICES['large-phone'];
      const { context, page } = await createDevicePage(device, BASE_URL, 'chromium');
      try {
        await page.waitForTimeout(WAIT.PAGE_SETTLE);
        await assertHidden(page, '#voiceInputBtn');
        await assertVisible(page, '#voiceInputBtnMobile');
      } finally {
        await context.close();
      }
    });

    it('uses phone upload and voice controls without toolbar overlap', async () => {
      const device = REPRESENTATIVE_DEVICES['small-phone'];
      const { context, page } = await createDevicePage(device, BASE_URL, 'chromium');
      try {
        await page.waitForTimeout(WAIT.PAGE_SETTLE);
        expect(await page.locator('.toolbar-center .btn-upload').isVisible()).toBe(false);
        await assertVisible(page, '.btn-upload-mobile');
        await assertVisible(page, '#voiceInputBtnMobile');

        const violations = await page.evaluate(() => {
          const visibleToolbarButtons = [...document.querySelectorAll('.toolbar button')]
            .filter((el): el is HTMLButtonElement => {
              const rect = el.getBoundingClientRect();
              const style = getComputedStyle(el);
              return rect.width > 0 && rect.height > 0 && style.display !== 'none' && style.visibility !== 'hidden';
            })
            .map((el) => ({
              selector: el.id ? `#${el.id}` : `.${[...el.classList].join('.')}`,
              rect: el.getBoundingClientRect(),
            }));

          const overlaps: string[] = [];
          for (let i = 0; i < visibleToolbarButtons.length; i += 1) {
            for (let j = i + 1; j < visibleToolbarButtons.length; j += 1) {
              const a = visibleToolbarButtons[i];
              const b = visibleToolbarButtons[j];
              const intersects =
                a.rect.left < b.rect.right &&
                a.rect.right > b.rect.left &&
                a.rect.top < b.rect.bottom &&
                a.rect.bottom > b.rect.top;
              if (intersects) {
                overlaps.push(`${a.selector} overlaps ${b.selector}`);
              }
            }
          }
          return overlaps;
        });

        expect(violations).toEqual([]);
      } finally {
        await context.close();
      }
    });

    it('keeps the mobile recording mic effect inside the button bounds', async () => {
      const device = REPRESENTATIVE_DEVICES['small-phone'];
      const { context, page } = await createDevicePage(device, BASE_URL, 'chromium');
      try {
        await page.waitForTimeout(WAIT.PAGE_SETTLE);
        await page.evaluate(() => {
          document.getElementById('voiceInputBtnMobile')?.classList.add('recording');
        });

        const shadow = await page.evaluate(() => {
          const button = document.getElementById('voiceInputBtnMobile');
          return button ? getComputedStyle(button).boxShadow : '';
        });

        expect(shadow).toContain('inset');
        expect(shadow).not.toContain(' 6px ');
      } finally {
        await context.close();
      }
    });

    it('keeps desktop upload and voice controls in one centered row', async () => {
      const { context, page } = await createDevicePage(iPadPro, BASE_URL, 'chromium');
      try {
        await page.setViewportSize({ width: 1280, height: 800 });
        await page.waitForTimeout(WAIT.PAGE_SETTLE);
        await assertVisible(page, '.toolbar-center .btn-upload');
        await assertVisible(page, '#voiceInputBtn');

        const layout = await page.evaluate(() => {
          const upload = document.querySelector('.toolbar-center .btn-upload')!.getBoundingClientRect();
          const voice = document.querySelector('#voiceInputBtn')!.getBoundingClientRect();
          return {
            centerYDifference: Math.abs(upload.top + upload.height / 2 - (voice.top + voice.height / 2)),
            centerXDifference: Math.abs(upload.left + upload.width / 2 - (voice.left + voice.width / 2)),
          };
        });

        expect(layout.centerYDifference).toBeLessThanOrEqual(2);
        expect(layout.centerXDifference).toBeGreaterThan(20);
      } finally {
        await context.close();
      }
    });
  });

  // ─── Device Classes ───────────────────────────────────────────────────────

  describe('Device Classes', () => {
    it('iOS user agent adds ios-device class', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        await assertHasClass(page, 'body', BODY_CLASSES.IOS);
      } finally {
        await context.close();
      }
    });

    it('Android user agent does NOT add ios-device', async () => {
      const pixel = DEVICE_REGISTRY.find((d) => d.name === 'Pixel 7')!;
      const { context, page } = await createDevicePage(pixel, BASE_URL);
      try {
        await assertNotHasClass(page, 'body', BODY_CLASSES.IOS);
      } finally {
        await context.close();
      }
    });

    it('Safari user agent adds safari-browser class', async () => {
      // iPhone 14 Pro uses Safari UA
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        await assertHasClass(page, 'body', BODY_CLASSES.SAFARI);
      } finally {
        await context.close();
      }
    });

    it('touch device adds touch-device class', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        await assertHasClass(page, 'body', BODY_CLASSES.TOUCH);
      } finally {
        await context.close();
      }
    });

    it('width < 430 adds device-mobile', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        await assertDeviceClasses(page, iPhone14Pro.viewport.width);
      } finally {
        await context.close();
      }
    });

    it('width 430-768 adds device-tablet', async () => {
      const tablet = REPRESENTATIVE_DEVICES['small-tablet'];
      const { context, page } = await createDevicePage(tablet, BASE_URL);
      try {
        await assertDeviceClasses(page, tablet.viewport.width);
      } finally {
        await context.close();
      }
    });

    it('width >= 768 adds device-desktop', async () => {
      const { context, page } = await createDevicePage(iPadPro, BASE_URL);
      try {
        await assertDeviceClasses(page, iPadPro.viewport.width);
      } finally {
        await context.close();
      }
    });
  });

  // ─── iOS Safe Areas ───────────────────────────────────────────────────────

  describe('iOS Safe Areas', () => {
    it('iOS header has extra padding for safe area', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        // On iOS devices, the header should have padding-top that accounts for safe area
        const paddingTop = await getCSSNumericValue(page, SELECTORS.HEADER, 'padding-top');
        // iOS safe area adds extra padding; at minimum the header should have some padding
        expect(paddingTop).toBeGreaterThanOrEqual(0);
        // Verify the ios-device class is present (which triggers safe area CSS)
        await assertHasClass(page, 'body', BODY_CLASSES.IOS);
      } finally {
        await context.close();
      }
    });

    it('iOS modal content has safe area paddings', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        // Open settings modal to test modal safe areas
        const settingsBtn = page.locator(SELECTORS.SETTINGS_MOBILE);
        if (await settingsBtn.isVisible()) {
          await settingsBtn.click();
          await page.waitForTimeout(300);
          // Check modal content exists
          const modalExists = await page.evaluate((sel) => {
            const el = document.querySelector(sel);
            return el !== null && getComputedStyle(el).display !== 'none';
          }, SELECTORS.SETTINGS_MODAL);
          if (modalExists) {
            // Safe area CSS vars should be applied via env(safe-area-inset-*)
            const content = await page.$(SELECTORS.SETTINGS_MODAL_CONTENT);
            expect(content).not.toBeNull();
          }
        }
      } finally {
        await context.close();
      }
    });
  });

  // ─── Touch Targets ────────────────────────────────────────────────────────

  describe('Touch Targets', () => {
    it('all interactive elements meet 44px minimum', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        const violations = await assertAccessibleTouchTargets(page, MIN_TOUCH_TARGET);
        if (violations.length > 0) {
          console.warn(
            `Touch target violations (${violations.length}):\n` +
              violations.map((v) => `  ${v.selector}: ${v.width}x${v.height}px`).join('\n')
          );
        }
        // Allow known small elements — notification action buttons (26x26px),
        // some icon buttons. These are documented findings for future fixes.
        expect(violations.length).toBeLessThanOrEqual(15);
      } finally {
        await context.close();
      }
    });
  });

  // ─── Inputs ───────────────────────────────────────────────────────────────

  describe('Inputs', () => {
    it('text inputs use font-size >= 16px', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        // Check visible text inputs (font-size < 16px causes iOS auto-zoom)
        const inputs = await page.$$('input[type="text"], input[type="search"], input:not([type]), textarea');
        const violations: string[] = [];
        for (const input of inputs) {
          const info = await input.evaluate((el) => ({
            fontSize: parseFloat(getComputedStyle(el).fontSize),
            selector: el.tagName.toLowerCase() + (el.className ? '.' + el.className.split(' ')[0] : ''),
          }));
          if (info.fontSize < 16) {
            violations.push(`${info.selector}: ${info.fontSize}px`);
          }
        }
        if (violations.length > 0) {
          console.warn(`Font-size violations (causes iOS auto-zoom):\n  ${violations.join('\n  ')}`);
        }
        // Many inputs inherit default browser font-size. Document and track.
        expect(violations.length).toBeLessThanOrEqual(20);
      } finally {
        await context.close();
      }
    });
  });

  // ─── Terminal ─────────────────────────────────────────────────────────────

  describe('Terminal', () => {
    it('terminal-container has touch-action: pan-y', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        const exists = await page.$(SELECTORS.TERMINAL_CONTAINER);
        if (exists) {
          const touchAction = await getCSSProperty(page, SELECTORS.TERMINAL_CONTAINER, 'touch-action');
          expect(touchAction).toContain('pan-y');
        }
      } finally {
        await context.close();
      }
    });
  });

  // ─── No Horizontal Overflow ───────────────────────────────────────────────

  describe('No Horizontal Overflow', () => {
    it('no horizontal scroll on phone viewport', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        await assertNoHorizontalOverflow(page);
      } finally {
        await context.close();
      }
    });
  });

  // ─── Main Content ─────────────────────────────────────────────────────────

  describe('Main Content', () => {
    it('main has margin-top for fixed header', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        const marginTop = await getCSSNumericValue(page, SELECTORS.MAIN, 'margin-top');
        // Main content should have enough margin-top to clear the fixed header (~42px)
        expect(marginTop).toBeGreaterThanOrEqual(30);
      } finally {
        await context.close();
      }
    });
  });

  // ─── Viewport Meta ────────────────────────────────────────────────────────

  describe('Viewport Meta', () => {
    it('zoom is not disabled', async () => {
      const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
      try {
        await assertZoomNotDisabled(page);
      } finally {
        await context.close();
      }
    });
  });
});