import { describe, test, expect, vi, beforeEach, afterEach } from 'vitest';
import React from 'react';
import { useKeyboardShortcuts } from './useKeyboardShortcuts';
import { getClipboardTree, setClipboardTree } from './clipboard';
import { renderEditorHarness, EditorHarness } from '../test-utils/editorHarness';
import { SELECTION_STATE } from '../editor/selection-fixture';
import { registerSelectionCommands } from '../editor/selection-commands';
import { __resetCommandsForTests, registerCommand } from '../editor/commands';
import { DeviceProvider, useDevice } from '../state/DeviceContext';
import { ShortcutsModalHost } from '../panels/topbar/ShortcutsModal';

/**
 * Keyboard layer on the REAL editor: every key goes through the one registry
 * dispatcher (useCommandShortcuts), nothing is mocked in @craftjs/core.
 * Fixture: ROOT > sec > sec-in > cols > col-0 (b1, b2) / col-1, plus sec2.
 */

let h: EditorHarness;
let device = 'desktop';

const Probe: React.FC = () => {
  useKeyboardShortcuts();
  device = useDevice().device;
  return null;
};

beforeEach(() => {
  __resetCommandsForTests();
  setClipboardTree(null);
  device = 'desktop';
  h = renderEditorHarness({
    initialState: SELECTION_STATE,
    wrap: (tree) => <DeviceProvider>{tree}</DeviceProvider>,
  });
  registerSelectionCommands();
  h.mountChild(<><Probe /><ShortcutsModalHost /></>);
});

afterEach(() => {
  h.unmount();
  __resetCommandsForTests();
  setClipboardTree(null);
  vi.restoreAllMocks();
  (document.activeElement as HTMLElement | null)?.blur?.();
});

const sel = () => h.query.getEvent('selected').all() as string[];
const kids = (id: string) => h.query.node(id).get().data.nodes as string[];
const key = (k: string, init: KeyboardEventInit = {}) => {
  const ev = new KeyboardEvent('keydown', { key: k, bubbles: true, cancelable: true, ...init });
  h.act(() => { document.dispatchEvent(ev); });
  return ev;
};
const mod = { ctrlKey: true };

function withFocus<T extends HTMLElement>(el: T, fn: () => void) {
  document.body.appendChild(el);
  el.focus();
  try { fn(); } finally { el.remove(); }
}

/** jsdom never reports isContentEditable, so stub the active element. */
function withEditable(fn: () => void) {
  const spy = vi.spyOn(document, 'activeElement', 'get')
    .mockReturnValue({ tagName: 'H1', isContentEditable: true, closest: () => null } as unknown as Element);
  try { fn(); } finally { spy.mockRestore(); }
}

describe('single dispatcher', () => {
  test('mounting the shell hooks adds exactly one document keydown listener', () => {
    h.unmount();
    __resetCommandsForTests();
    const spy = vi.spyOn(document, 'addEventListener');
    h = renderEditorHarness({ initialState: SELECTION_STATE });
    h.mountChild(<Probe />);
    expect(spy.mock.calls.filter(([t]) => t === 'keydown')).toHaveLength(1);
  });
});

describe('duplicate (mod+d)', () => {
  test('inserts the copy right AFTER the source and selects it', () => {
    h.act(() => h.actions.selectNode('b1'));
    const ev = key('d', mod);
    expect(ev.defaultPrevented).toBe(true);
    const order = kids('col-0');
    expect(order).toHaveLength(3);
    expect(order[0]).toBe('b1');
    expect(order[2]).toBe('b2');
    expect(sel()).toEqual([order[1]]);
  });
});

describe('move among siblings (alt+arrow)', () => {
  test('alt+arrowdown moves b1 below b2; alt+arrowup moves it back', () => {
    h.act(() => h.actions.selectNode('b1'));
    key('ArrowDown', { altKey: true });
    expect(kids('col-0')).toEqual(['b2', 'b1']);
    key('ArrowUp', { altKey: true });
    expect(kids('col-0')).toEqual(['b1', 'b2']);
  });

  test('at the edge it is a no-op', () => {
    h.act(() => h.actions.selectNode('b1'));
    key('ArrowUp', { altKey: true });
    expect(kids('col-0')).toEqual(['b1', 'b2']);
  });
});

describe('device keys 1/2/3', () => {
  test('switch the shared device', () => {
    key('2');
    expect(device).toBe('tablet');
    key('3');
    expect(device).toBe('mobile');
    key('1');
    expect(device).toBe('desktop');
  });

  test('are ignored while typing in an input', () => {
    withFocus(document.createElement('input'), () => {
      key('3');
      expect(device).toBe('desktop');
    });
  });

  test('are ignored while a contentEditable heading is focused', () => {
    withEditable(() => {
      key('3');
      expect(device).toBe('desktop');
    });
  });

  test('are not hijacked by modifier combos', () => {
    key('3', mod);
    expect(device).toBe('desktop');
  });

  // #39 follow-up: bare keys never fire while any dialog/modal is open.
  test.each([
    ['an aria-modal dialog', { role: 'dialog', 'aria-modal': 'true' }],
    ['a non-modal role=dialog (e.g. a popover)', { role: 'dialog' }],
    ['an alertdialog', { role: 'alertdialog' }],
    ['a Modal backdrop without a role', { class: 'modal-backdrop' }],
  ])('are ignored while %s is open, even with focus on the body', (_label, attrs) => {
    const d = document.createElement('div');
    for (const [k, v] of Object.entries(attrs)) d.setAttribute(k, v);
    document.body.appendChild(d);
    try {
      key('3');
      expect(device).toBe('desktop');
    } finally { d.remove(); }
    key('3');
    expect(device).toBe('mobile');
  });

  test('are ignored while focus is inside a dialog', () => {
    const d = document.createElement('div');
    d.setAttribute('role', 'dialog');
    const btn = document.createElement('button');
    d.appendChild(btn);
    document.body.appendChild(d);
    btn.focus();
    try {
      key('2');
      expect(device).toBe('desktop');
    } finally { d.remove(); }
  });

  test('a role=dialog inside the canvas frame (page content) does not block them', () => {
    const frame = document.createElement('div');
    frame.className = 'canvas-device-frame';
    const d = document.createElement('div');
    d.setAttribute('role', 'dialog');
    d.setAttribute('aria-modal', 'true');
    frame.appendChild(d);
    document.body.appendChild(frame);
    try {
      key('2');
      expect(device).toBe('tablet');
    } finally { frame.remove(); }
  });
});

describe('site commands (mod+s)', () => {
  test('runs the registered site.save and prevents the browser Save dialog', () => {
    const run = vi.fn();
    registerCommand({ id: 'site.save', title: 'Save', group: 'site', shortcut: 'mod+s', allowWhileTyping: true, run });
    const ev = key('s', mod);
    expect(run).toHaveBeenCalledTimes(1);
    expect(ev.defaultPrevented).toBe(true);
  });

  test('still fires with a text field focused', () => {
    const run = vi.fn();
    registerCommand({ id: 'site.save', title: 'Save', group: 'site', shortcut: 'mod+s', allowWhileTyping: true, run });
    withFocus(document.createElement('input'), () => { key('s', mod); });
    expect(run).toHaveBeenCalledTimes(1);
  });
});

describe('cheat sheet (mod+/)', () => {
  const dialog = () => document.body.querySelector('[role="dialog"]');

  test('mod+/ opens it, listing the live commands; Escape closes it', () => {
    expect(dialog()).toBeNull();
    key('/', mod);
    expect(dialog()).not.toBeNull();
    expect(dialog()!.textContent).toContain('Keyboard shortcuts');
    expect(dialog()!.textContent).toContain('Duplicate');
    key('Escape');
    expect(dialog()).toBeNull();
  });

  test('mod+shift+? opens it too', () => {
    key('?', { ...mod, shiftKey: true });
    expect(dialog()).not.toBeNull();
  });

  test('Esc closing the dialog does not also climb the canvas selection', () => {
    h.act(() => h.actions.selectNode('b1'));
    key('/', mod);
    key('Escape');
    expect(sel()).toEqual(['b1']);
  });
});

describe('copy / paste (mod+c / mod+v)', () => {
  test('copy stores a detached tree snapshot of the selection', () => {
    h.act(() => h.actions.selectNode('b1'));
    key('c', mod);
    const clip = getClipboardTree();
    expect(clip!.rootNodeId).toBe('b1');
  });

  test('paste lands right after the selected node with FRESH ids, and selects it', () => {
    h.act(() => h.actions.selectNode('b1'));
    key('c', mod);
    key('v', mod);
    const order = kids('col-0');
    expect(order).toHaveLength(3);
    expect(order[0]).toBe('b1');
    expect(order[1]).not.toBe('b1');
    expect(new Set(order).size).toBe(3);
    expect(sel()).toEqual([order[1]]);
  });

  test('paste with nothing selected appends to ROOT', () => {
    h.act(() => h.actions.selectNode('b1'));
    key('c', mod);
    h.act(() => h.actions.clearEvents());
    key('v', mod);
    const rootKids = kids('ROOT');
    expect(rootKids).toHaveLength(3);
    expect(rootKids.slice(0, 2)).toEqual(['sec', 'sec2']);
  });

  test('paste with an empty clipboard is a no-op and not prevented', () => {
    h.act(() => h.actions.selectNode('b1'));
    const ev = key('v', mod);
    expect(kids('col-0')).toEqual(['b1', 'b2']);
    expect(ev.defaultPrevented).toBe(false);
  });

  test('ignored while focus is in an input', () => {
    h.act(() => h.actions.selectNode('b1'));
    withFocus(document.createElement('input'), () => { key('c', mod); });
    expect(getClipboardTree()).toBeNull();
  });

  test('ignored while a contentEditable is focused', () => {
    h.act(() => h.actions.selectNode('b1'));
    withEditable(() => { key('c', mod); });
    expect(getClipboardTree()).toBeNull();
  });
});

describe('delete / undo / redo', () => {
  test('Delete removes the selection; mod+z restores; mod+y redoes', () => {
    h.act(() => h.actions.selectNode('b1'));
    key('Delete');
    expect(kids('col-0')).toEqual(['b2']);
    key('z', mod);
    expect(kids('col-0')).toEqual(['b1', 'b2']);
    key('y', mod);
    expect(kids('col-0')).toEqual(['b2']);
    key('z', mod);
    key('z', { ...mod, shiftKey: true });
    expect(kids('col-0')).toEqual(['b2']);
  });

  test('Backspace in an input does not delete the node', () => {
    h.act(() => h.actions.selectNode('b1'));
    withFocus(document.createElement('input'), () => { key('Backspace'); });
    expect(kids('col-0')).toEqual(['b1', 'b2']);
  });
});

describe('selection navigation', () => {
  test('Esc climbs button -> column -> columns -> section, then clears; never ROOT', () => {
    h.act(() => h.actions.selectNode('b1'));
    const seen: string[][] = [];
    for (let i = 0; i < 4; i++) { key('Escape'); seen.push(sel()); }
    expect(seen).toEqual([['col-0'], ['cols'], ['sec'], []]);
    key('Escape');
    expect(sel()).not.toContain('ROOT');
  });

  test('Tab cycles siblings and wraps; Shift+Tab reverses; default prevented', () => {
    h.act(() => h.actions.selectNode('b1'));
    expect(key('Tab').defaultPrevented).toBe(true);
    expect(sel()).toEqual(['b2']);
    key('Tab');
    expect(sel()).toEqual(['b1']);
    key('Tab', { shiftKey: true });
    expect(sel()).toEqual(['b2']);
  });

  test('Tab is not intercepted with an <input> focused', () => {
    h.act(() => h.actions.selectNode('b1'));
    withFocus(document.createElement('input'), () => {
      expect(key('Tab').defaultPrevented).toBe(false);
    });
    expect(sel()).toEqual(['b1']);
  });

  test('Tab is not intercepted while a <button> (breadcrumb crumb, panel button) has focus', () => {
    h.act(() => h.actions.selectNode('b1'));
    withFocus(document.createElement('button'), () => {
      expect(key('Tab').defaultPrevented).toBe(false);
      expect(key('Tab', { shiftKey: true }).defaultPrevented).toBe(false);
    });
    expect(sel()).toEqual(['b1']);
  });

  test('Tab is not intercepted for focus inside a dialog', () => {
    h.act(() => h.actions.selectNode('b1'));
    const dlg = document.createElement('div');
    dlg.setAttribute('role', 'dialog');
    const inner = document.createElement('div');
    inner.tabIndex = 0;
    dlg.appendChild(inner);
    document.body.appendChild(dlg);
    inner.focus();
    expect(key('Tab').defaultPrevented).toBe(false);
    dlg.remove();
    expect(sel()).toEqual(['b1']);
  });

  test('Tab with nothing selected, or a lone node, is left to the browser', () => {
    expect(key('Tab').defaultPrevented).toBe(false);
    h.act(() => h.actions.selectNode('cols'));
    expect(key('Tab').defaultPrevented).toBe(false);
  });
});