import { describe, expect, it, beforeEach, vi } from 'vitest';
import { detectPlatform, isMac, formatShortcut, matchesShortcut, shortcutToCodeMirrorKeybinding } from './utils';
import { KEYS, SHORTCUTS } from './constants';
import type { KeyboardShortcut } from './constants';

describe('detectPlatform', () => {
  beforeEach(() => {
    // Reset navigator mock before each test
    vi.unstubAllGlobals();
  });

  it('detects Mac platform from navigator.platform', () => {
    vi.stubGlobal('navigator', {
      platform: 'MacIntel',
      userAgent: 'Mozilla/5.0',
    });
    expect(detectPlatform()).toBe('mac');
  });

  it('detects Mac platform from userAgent', () => {
    vi.stubGlobal('navigator', {
      platform: 'unknown',
      userAgent: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)',
    });
    expect(detectPlatform()).toBe('mac');
  });

  it('detects Windows platform', () => {
    vi.stubGlobal('navigator', {
      platform: 'Win32',
      userAgent: 'Mozilla/5.0 (Windows NT 10.0)',
    });
    expect(detectPlatform()).toBe('windows');
  });

  it('detects Linux platform', () => {
    vi.stubGlobal('navigator', {
      platform: 'Linux x86_64',
      userAgent: 'Mozilla/5.0 (X11; Linux x86_64)',
    });
    expect(detectPlatform()).toBe('linux');
  });

  it('returns unknown when navigator is undefined', () => {
    vi.stubGlobal('navigator', undefined);
    expect(detectPlatform()).toBe('unknown');
  });

  it('returns unknown for unrecognized platform', () => {
    vi.stubGlobal('navigator', {
      platform: 'FreeBSD',
      userAgent: 'Mozilla/5.0',
    });
    expect(detectPlatform()).toBe('unknown');
  });
});

describe('isMac', () => {
  it('returns true on Mac platform', () => {
    vi.stubGlobal('navigator', {
      platform: 'MacIntel',
      userAgent: 'Mozilla/5.0',
    });
    expect(isMac()).toBe(true);
  });

  it('returns false on Windows platform', () => {
    vi.stubGlobal('navigator', {
      platform: 'Win32',
      userAgent: 'Mozilla/5.0',
    });
    expect(isMac()).toBe(false);
  });
});

describe('formatShortcut', () => {
  it('formats Cmd+Enter on Mac', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.ENTER,
      modifiers: { ctrlOrCmd: true },
    };
    expect(formatShortcut(shortcut, 'mac')).toBe('Cmd+Enter');
  });

  it('formats Ctrl+Enter on Windows', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.ENTER,
      modifiers: { ctrlOrCmd: true },
    };
    expect(formatShortcut(shortcut, 'windows')).toBe('Ctrl+Enter');
  });

  it('formats Ctrl+Enter on Linux', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.ENTER,
      modifiers: { ctrlOrCmd: true },
    };
    expect(formatShortcut(shortcut, 'linux')).toBe('Ctrl+Enter');
  });

  it('formats Ctrl+S', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { ctrl: true },
    };
    expect(formatShortcut(shortcut, 'windows')).toBe('Ctrl+S');
  });

  it('formats Cmd+S on Mac', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { cmd: true },
    };
    expect(formatShortcut(shortcut, 'mac')).toBe('Cmd+S');
  });

  it('formats Alt as Option on Mac', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.A,
      modifiers: { alt: true },
    };
    expect(formatShortcut(shortcut, 'mac')).toBe('Option+A');
  });

  it('formats Alt on Windows', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.A,
      modifiers: { alt: true },
    };
    expect(formatShortcut(shortcut, 'windows')).toBe('Alt+A');
  });

  it('formats Shift+Ctrl+S', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { ctrl: true, shift: true },
    };
    expect(formatShortcut(shortcut, 'windows')).toBe('Ctrl+Shift+S');
  });

  it('formats key without modifiers', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.ESCAPE,
    };
    expect(formatShortcut(shortcut, 'mac')).toBe('Esc');
  });

  it('formats special keys correctly', () => {
    expect(formatShortcut({ key: KEYS.ESCAPE }, 'mac')).toBe('Esc');
    expect(formatShortcut({ key: KEYS.SPACE }, 'mac')).toBe('Space');
    expect(formatShortcut({ key: KEYS.TAB }, 'mac')).toBe('Tab');
    expect(formatShortcut({ key: KEYS.DELETE }, 'mac')).toBe('Del');
  });

  it('formats arrow keys with symbols', () => {
    expect(formatShortcut({ key: KEYS.ARROW_UP }, 'mac')).toBe('↑');
    expect(formatShortcut({ key: KEYS.ARROW_DOWN }, 'mac')).toBe('↓');
    expect(formatShortcut({ key: KEYS.ARROW_LEFT }, 'mac')).toBe('←');
    expect(formatShortcut({ key: KEYS.ARROW_RIGHT }, 'mac')).toBe('→');
  });

  it('uppercases single letter keys', () => {
    expect(formatShortcut({ key: KEYS.A }, 'mac')).toBe('A');
    expect(formatShortcut({ key: KEYS.Z }, 'mac')).toBe('Z');
  });

  it('uses current platform when not specified', () => {
    vi.stubGlobal('navigator', {
      platform: 'MacIntel',
      userAgent: 'Mozilla/5.0',
    });
    const shortcut: KeyboardShortcut = {
      key: KEYS.ENTER,
      modifiers: { ctrlOrCmd: true },
    };
    expect(formatShortcut(shortcut)).toBe('Cmd+Enter');
  });
});

describe('matchesShortcut', () => {
  it('matches exact key without modifiers', () => {
    const shortcut: KeyboardShortcut = { key: KEYS.ESCAPE };
    const event = new KeyboardEvent('keydown', { key: 'Escape' });
    expect(matchesShortcut(event, shortcut)).toBe(true);
  });

  it('does not match different key', () => {
    const shortcut: KeyboardShortcut = { key: KEYS.ESCAPE };
    const event = new KeyboardEvent('keydown', { key: 'Enter' });
    expect(matchesShortcut(event, shortcut)).toBe(false);
  });

  it('matches ctrlOrCmd with Ctrl key', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.ENTER,
      modifiers: { ctrlOrCmd: true },
    };
    const event = new KeyboardEvent('keydown', { key: 'Enter', ctrlKey: true });
    expect(matchesShortcut(event, shortcut)).toBe(true);
  });

  it('matches ctrlOrCmd with Meta key', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.ENTER,
      modifiers: { ctrlOrCmd: true },
    };
    const event = new KeyboardEvent('keydown', { key: 'Enter', metaKey: true });
    expect(matchesShortcut(event, shortcut)).toBe(true);
  });

  it('does not match ctrlOrCmd without modifier', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.ENTER,
      modifiers: { ctrlOrCmd: true },
    };
    const event = new KeyboardEvent('keydown', { key: 'Enter' });
    expect(matchesShortcut(event, shortcut)).toBe(false);
  });

  it('matches Ctrl modifier', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { ctrl: true },
    };
    const event = new KeyboardEvent('keydown', { key: 's', ctrlKey: true });
    expect(matchesShortcut(event, shortcut)).toBe(true);
  });

  it('matches Cmd modifier', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { cmd: true },
    };
    const event = new KeyboardEvent('keydown', { key: 's', metaKey: true });
    expect(matchesShortcut(event, shortcut)).toBe(true);
  });

  it('matches Alt modifier', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.A,
      modifiers: { alt: true },
    };
    const event = new KeyboardEvent('keydown', { key: 'a', altKey: true });
    expect(matchesShortcut(event, shortcut)).toBe(true);
  });

  it('matches Shift modifier', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.A,
      modifiers: { shift: true },
    };
    const event = new KeyboardEvent('keydown', { key: 'a', shiftKey: true });
    expect(matchesShortcut(event, shortcut)).toBe(true);
  });

  it('matches multiple modifiers', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { ctrl: true, shift: true },
    };
    const event = new KeyboardEvent('keydown', {
      key: 's',
      ctrlKey: true,
      shiftKey: true,
    });
    expect(matchesShortcut(event, shortcut)).toBe(true);
  });

  it('does not match when extra modifier is pressed', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { ctrl: true },
    };
    const event = new KeyboardEvent('keydown', {
      key: 's',
      ctrlKey: true,
      shiftKey: true,
    });
    expect(matchesShortcut(event, shortcut)).toBe(false);
  });

  it('does not match when required modifier is missing', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { ctrl: true, shift: true },
    };
    const event = new KeyboardEvent('keydown', { key: 's', ctrlKey: true });
    expect(matchesShortcut(event, shortcut)).toBe(false);
  });

  it('matches ctrlOrCmd with additional modifiers', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { ctrlOrCmd: true, shift: true },
    };
    const event = new KeyboardEvent('keydown', {
      key: 's',
      ctrlKey: true,
      shiftKey: true,
    });
    expect(matchesShortcut(event, shortcut)).toBe(true);
  });

  it('does not match when no modifiers expected but some pressed', () => {
    const shortcut: KeyboardShortcut = { key: KEYS.ESCAPE };
    const event = new KeyboardEvent('keydown', { key: 'Escape', ctrlKey: true });
    expect(matchesShortcut(event, shortcut)).toBe(false);
  });

  it('works with predefined SHORTCUTS', () => {
    const event = new KeyboardEvent('keydown', { key: 'Enter', metaKey: true });
    expect(matchesShortcut(event, SHORTCUTS.SUBMIT)).toBe(true);
  });
});

describe('shortcutToCodeMirrorKeybinding', () => {
  it('formats ctrlOrCmd shortcuts with Mod', () => {
    expect(shortcutToCodeMirrorKeybinding(SHORTCUTS.SUBMIT)).toBe('Mod-Enter');
  });

  it('formats explicit modifiers', () => {
    const shortcut: KeyboardShortcut = {
      key: KEYS.S,
      modifiers: { ctrl: true, shift: true },
    };
    expect(shortcutToCodeMirrorKeybinding(shortcut)).toBe('Ctrl-Shift-s');
  });

  it('formats without modifiers', () => {
    const shortcut: KeyboardShortcut = { key: KEYS.ESCAPE };
    expect(shortcutToCodeMirrorKeybinding(shortcut)).toBe('Escape');
  });
});