/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import type React from 'react';
import { renderHook, act, waitFor } from '@testing-library/react';
import type { Mock } from 'vitest';
import { vi } from 'vitest';
import type { Key } from './KeypressContext.js';
import { KeypressProvider, useKeypressContext } from './KeypressContext.js';
import { useStdin } from 'ink';
import { EventEmitter } from 'node:events';

// Mock the 'ink' module to control stdin
vi.mock('ink', async (importOriginal) => {
  const original = await importOriginal<typeof import('ink')>();
  return {
    ...original,
    useStdin: vi.fn(),
  };
});

class MockStdin extends EventEmitter {
  isTTY = true;
  setRawMode = vi.fn();
  override on = this.addListener;
  override removeListener = super.removeListener;
  write = vi.fn();
  resume = vi.fn();
  pause = vi.fn();

  // Helper to simulate a keypress event
  pressKey(key: Partial<Key>) {
    this.emit('keypress', null, key);
  }

  // Helper to simulate a kitty protocol sequence
  sendKittySequence(sequence: string) {
    this.emit('data', Buffer.from(sequence));
  }

  // Helper to simulate a paste event
  sendPaste(text: string) {
    const PASTE_MODE_PREFIX = `\x1b[200~`;
    const PASTE_MODE_SUFFIX = `\x1b[201~`;
    this.emit('data', Buffer.from(PASTE_MODE_PREFIX));
    this.emit('data', Buffer.from(text));
    this.emit('data', Buffer.from(PASTE_MODE_SUFFIX));
  }
}

describe('KeypressContext - Kitty Protocol', () => {
  let stdin: MockStdin;
  const mockSetRawMode = vi.fn();

  const wrapper = ({
    children,
    kittyProtocolEnabled = true,
  }: {
    children: React.ReactNode;
    kittyProtocolEnabled?: boolean;
  }) => (
    <KeypressProvider kittyProtocolEnabled={kittyProtocolEnabled}>
      {children}
    </KeypressProvider>
  );

  beforeEach(() => {
    vi.clearAllMocks();
    stdin = new MockStdin();
    (useStdin as Mock).mockReturnValue({
      stdin,
      setRawMode: mockSetRawMode,
    });
  });

  describe('Enter key handling', () => {
    it('should recognize regular enter key (keycode 13) in kitty protocol', async () => {
      const keyHandler = vi.fn();

      const { result } = renderHook(() => useKeypressContext(), {
        wrapper: ({ children }) =>
          wrapper({ children, kittyProtocolEnabled: true }),
      });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send kitty protocol sequence for regular enter: ESC[13u
      act(() => {
        stdin.sendKittySequence(`\x1b[13u`);
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'return',
          kittyProtocol: true,
          ctrl: false,
          meta: false,
          shift: false,
        }),
      );
    });

    it('should recognize numpad enter key (keycode 57414) in kitty protocol', async () => {
      const keyHandler = vi.fn();

      const { result } = renderHook(() => useKeypressContext(), {
        wrapper: ({ children }) =>
          wrapper({ children, kittyProtocolEnabled: true }),
      });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send kitty protocol sequence for numpad enter: ESC[57414u
      act(() => {
        stdin.sendKittySequence(`\x1b[57414u`);
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'return',
          kittyProtocol: true,
          ctrl: false,
          meta: false,
          shift: false,
        }),
      );
    });

    it('should handle numpad enter with modifiers', async () => {
      const keyHandler = vi.fn();

      const { result } = renderHook(() => useKeypressContext(), {
        wrapper: ({ children }) =>
          wrapper({ children, kittyProtocolEnabled: true }),
      });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send kitty protocol sequence for numpad enter with Shift (modifier 2): ESC[57414;2u
      act(() => {
        stdin.sendKittySequence(`\x1b[57414;2u`);
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'return',
          kittyProtocol: true,
          ctrl: false,
          meta: false,
          shift: true,
        }),
      );
    });

    it('should handle numpad enter with Ctrl modifier', async () => {
      const keyHandler = vi.fn();

      const { result } = renderHook(() => useKeypressContext(), {
        wrapper: ({ children }) =>
          wrapper({ children, kittyProtocolEnabled: true }),
      });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send kitty protocol sequence for numpad enter with Ctrl (modifier 5): ESC[57414;5u
      act(() => {
        stdin.sendKittySequence(`\x1b[57414;5u`);
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'return',
          kittyProtocol: true,
          ctrl: true,
          meta: false,
          shift: false,
        }),
      );
    });

    it('should handle numpad enter with Alt modifier', async () => {
      const keyHandler = vi.fn();

      const { result } = renderHook(() => useKeypressContext(), {
        wrapper: ({ children }) =>
          wrapper({ children, kittyProtocolEnabled: true }),
      });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send kitty protocol sequence for numpad enter with Alt (modifier 3): ESC[57414;3u
      act(() => {
        stdin.sendKittySequence(`\x1b[57414;3u`);
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'return',
          kittyProtocol: true,
          ctrl: false,
          meta: true,
          shift: false,
        }),
      );
    });

    it('should not process kitty sequences when kitty protocol is disabled', async () => {
      const keyHandler = vi.fn();

      const { result } = renderHook(() => useKeypressContext(), {
        wrapper: ({ children }) =>
          wrapper({ children, kittyProtocolEnabled: false }),
      });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send kitty protocol sequence for numpad enter
      act(() => {
        stdin.sendKittySequence(`\x1b[57414u`);
      });

      // When kitty protocol is disabled, the sequence should be passed through
      // as individual keypresses, not recognized as a single enter key
      expect(keyHandler).not.toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'return',
          kittyProtocol: true,
        }),
      );
    });
  });

  describe('Escape key handling', () => {
    it('should recognize escape key (keycode 27) in kitty protocol', async () => {
      const keyHandler = vi.fn();

      const { result } = renderHook(() => useKeypressContext(), {
        wrapper: ({ children }) =>
          wrapper({ children, kittyProtocolEnabled: true }),
      });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send kitty protocol sequence for escape: ESC[27u
      act(() => {
        stdin.sendKittySequence('\x1b[27u');
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'escape',
          kittyProtocol: true,
        }),
      );
    });
  });

  describe('Tab and Backspace handling', () => {
    it('should recognize Tab key in kitty protocol', async () => {
      const keyHandler = vi.fn();
      const { result } = renderHook(() => useKeypressContext(), { wrapper });
      act(() => result.current.subscribe(keyHandler));

      act(() => {
        stdin.sendKittySequence(`\x1b[9u`);
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'tab',
          kittyProtocol: true,
          shift: false,
        }),
      );
    });

    it('should recognize Shift+Tab in kitty protocol', async () => {
      const keyHandler = vi.fn();
      const { result } = renderHook(() => useKeypressContext(), { wrapper });
      act(() => result.current.subscribe(keyHandler));

      // Modifier 2 is Shift
      act(() => {
        stdin.sendKittySequence(`\x1b[9;2u`);
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'tab',
          kittyProtocol: true,
          shift: true,
        }),
      );
    });

    it('should recognize Backspace key in kitty protocol', async () => {
      const keyHandler = vi.fn();
      const { result } = renderHook(() => useKeypressContext(), { wrapper });
      act(() => result.current.subscribe(keyHandler));

      act(() => {
        stdin.sendKittySequence(`\x1b[127u`);
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'backspace',
          kittyProtocol: true,
          meta: false,
        }),
      );
    });

    it('should recognize Option+Backspace in kitty protocol', async () => {
      const keyHandler = vi.fn();
      const { result } = renderHook(() => useKeypressContext(), { wrapper });
      act(() => result.current.subscribe(keyHandler));

      // Modifier 3 is Alt/Option
      act(() => {
        stdin.sendKittySequence(`\x1b[127;3u`);
      });

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'backspace',
          kittyProtocol: true,
          meta: true,
        }),
      );
    });
  });

  describe('paste mode', () => {
    it('should handle multiline paste as a single event', async () => {
      const keyHandler = vi.fn();
      const pastedText = 'This \n is \n a \n multiline \n paste.';

      const { result } = renderHook(() => useKeypressContext(), {
        wrapper,
      });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Simulate a bracketed paste event
      act(() => {
        stdin.sendPaste(pastedText);
      });

      await waitFor(() => {
        // Expect the handler to be called exactly once for the entire paste
        expect(keyHandler).toHaveBeenCalledTimes(1);
      });

      // Verify the single event contains the full pasted text
      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          paste: true,
          sequence: pastedText,
        }),
      );
    });
  });

  describe('debug keystroke logging', () => {
    let consoleLogSpy: ReturnType<typeof vi.spyOn>;
    let consoleWarnSpy: ReturnType<typeof vi.spyOn>;

    beforeEach(() => {
      consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
      consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
    });

    afterEach(() => {
      consoleLogSpy.mockRestore();
      consoleWarnSpy.mockRestore();
    });

    it('should not log keystrokes when debugKeystrokeLogging is false', async () => {
      const keyHandler = vi.fn();

      const wrapper = ({ children }: { children: React.ReactNode }) => (
        <KeypressProvider
          kittyProtocolEnabled={true}
          debugKeystrokeLogging={false}
        >
          {children}
        </KeypressProvider>
      );

      const { result } = renderHook(() => useKeypressContext(), { wrapper });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send a kitty sequence
      act(() => {
        stdin.sendKittySequence('\x1b[27u');
      });

      expect(keyHandler).toHaveBeenCalled();
      expect(consoleLogSpy).not.toHaveBeenCalledWith(
        expect.stringContaining('[DEBUG] Kitty'),
      );
    });

    it('should log kitty buffer accumulation when debugKeystrokeLogging is true', async () => {
      const keyHandler = vi.fn();

      const wrapper = ({ children }: { children: React.ReactNode }) => (
        <KeypressProvider
          kittyProtocolEnabled={true}
          debugKeystrokeLogging={true}
        >
          {children}
        </KeypressProvider>
      );

      const { result } = renderHook(() => useKeypressContext(), { wrapper });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send a complete kitty sequence for escape
      act(() => {
        stdin.sendKittySequence('\x1b[27u');
      });

      expect(consoleLogSpy).toHaveBeenCalledWith(
        '[DEBUG] Kitty buffer accumulating:',
        expect.stringContaining('\x1b[27u'),
      );
      const parsedCall = consoleLogSpy.mock.calls.find(
        (args) =>
          typeof args[0] === 'string' &&
          args[0].includes('[DEBUG] Kitty sequence parsed successfully'),
      );
      expect(parsedCall).toBeTruthy();
      expect(parsedCall?.[1]).toEqual(expect.stringContaining('\x1b[27u'));
    });

    it('should log kitty buffer overflow when debugKeystrokeLogging is true', async () => {
      const keyHandler = vi.fn();

      const wrapper = ({ children }: { children: React.ReactNode }) => (
        <KeypressProvider
          kittyProtocolEnabled={true}
          debugKeystrokeLogging={true}
        >
          {children}
        </KeypressProvider>
      );

      const { result } = renderHook(() => useKeypressContext(), { wrapper });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send an invalid long sequence to trigger overflow
      const longInvalidSequence = '\x1b[' + 'x'.repeat(100);
      act(() => {
        stdin.sendKittySequence(longInvalidSequence);
      });

      expect(consoleLogSpy).toHaveBeenCalledWith(
        '[DEBUG] Kitty buffer overflow, clearing:',
        expect.any(String),
      );
    });

    it('should log kitty buffer clear on Ctrl+C when debugKeystrokeLogging is true', async () => {
      const keyHandler = vi.fn();

      const wrapper = ({ children }: { children: React.ReactNode }) => (
        <KeypressProvider
          kittyProtocolEnabled={true}
          debugKeystrokeLogging={true}
        >
          {children}
        </KeypressProvider>
      );

      const { result } = renderHook(() => useKeypressContext(), { wrapper });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send incomplete kitty sequence
      act(() => {
        stdin.pressKey({
          name: undefined,
          ctrl: false,
          meta: false,
          shift: false,
          sequence: '\x1b[1',
        });
      });

      // Send Ctrl+C
      act(() => {
        stdin.pressKey({
          name: 'c',
          ctrl: true,
          meta: false,
          shift: false,
          sequence: '\x03',
        });
      });

      expect(consoleLogSpy).toHaveBeenCalledWith(
        '[DEBUG] Kitty buffer cleared on Ctrl+C:',
        '\x1b[1',
      );

      // Verify Ctrl+C was handled
      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'c',
          ctrl: true,
        }),
      );
    });

    it('should show char codes when debugKeystrokeLogging is true even without debug mode', async () => {
      const keyHandler = vi.fn();

      const wrapper = ({ children }: { children: React.ReactNode }) => (
        <KeypressProvider
          kittyProtocolEnabled={true}
          debugKeystrokeLogging={true}
        >
          {children}
        </KeypressProvider>
      );

      const { result } = renderHook(() => useKeypressContext(), { wrapper });

      act(() => {
        result.current.subscribe(keyHandler);
      });

      // Send incomplete kitty sequence
      const sequence = '\x1b[12';
      act(() => {
        stdin.pressKey({
          name: undefined,
          ctrl: false,
          meta: false,
          shift: false,
          sequence,
        });
      });

      // Verify debug logging for accumulation
      expect(consoleLogSpy).toHaveBeenCalledWith(
        '[DEBUG] Kitty buffer accumulating:',
        sequence,
      );

      // Verify warning for char codes
      expect(consoleWarnSpy).toHaveBeenCalledWith(
        'Kitty sequence buffer has char codes:',
        [27, 91, 49, 50],
      );
    });
  });

  describe('Parameterized functional keys', () => {
    it.each([
      // Parameterized
      { sequence: `\x1b[1;2H`, expected: { name: 'home', shift: true } },
      { sequence: `\x1b[1;5F`, expected: { name: 'end', ctrl: true } },
      { sequence: `\x1b[1;1P`, expected: { name: 'f1' } },
      { sequence: `\x1b[1;3Q`, expected: { name: 'f2', meta: true } },
      { sequence: `\x1b[3~`, expected: { name: 'delete' } },
      { sequence: `\x1b[5~`, expected: { name: 'pageup' } },
      { sequence: `\x1b[6~`, expected: { name: 'pagedown' } },
      { sequence: `\x1b[1~`, expected: { name: 'home' } },
      { sequence: `\x1b[4~`, expected: { name: 'end' } },
      { sequence: `\x1b[2~`, expected: { name: 'insert' } },
      // Legacy Arrows
      {
        sequence: `\x1b[A`,
        expected: { name: 'up', ctrl: false, meta: false, shift: false },
      },
      {
        sequence: `\x1b[B`,
        expected: { name: 'down', ctrl: false, meta: false, shift: false },
      },
      {
        sequence: `\x1b[C`,
        expected: { name: 'right', ctrl: false, meta: false, shift: false },
      },
      {
        sequence: `\x1b[D`,
        expected: { name: 'left', ctrl: false, meta: false, shift: false },
      },
      // Legacy Home/End
      {
        sequence: `\x1b[H`,
        expected: { name: 'home', ctrl: false, meta: false, shift: false },
      },
      {
        sequence: `\x1b[F`,
        expected: { name: 'end', ctrl: false, meta: false, shift: false },
      },
    ])(
      'should recognize sequence "$sequence" as $expected.name',
      ({ sequence, expected }) => {
        const keyHandler = vi.fn();
        const { result } = renderHook(() => useKeypressContext(), { wrapper });
        act(() => result.current.subscribe(keyHandler));

        act(() => stdin.sendKittySequence(sequence));

        expect(keyHandler).toHaveBeenCalledWith(
          expect.objectContaining(expected),
        );
      },
    );
  });

  describe('Shift+Tab forms', () => {
    it.each([
      { sequence: `\x1b[Z`, description: 'legacy reverse Tab' },
      { sequence: `\x1b[1;2Z`, description: 'parameterized reverse Tab' },
    ])(
      'should recognize $description "$sequence" as Shift+Tab',
      ({ sequence }) => {
        const keyHandler = vi.fn();
        const { result } = renderHook(() => useKeypressContext(), { wrapper });
        act(() => result.current.subscribe(keyHandler));

        act(() => stdin.sendKittySequence(sequence));
        expect(keyHandler).toHaveBeenCalledWith(
          expect.objectContaining({ name: 'tab', shift: true }),
        );
      },
    );
  });

  describe('Double-tap and batching', () => {
    it('should emit two delete events for double-tap CSI[3~', async () => {
      const keyHandler = vi.fn();
      const { result } = renderHook(() => useKeypressContext(), { wrapper });
      act(() => result.current.subscribe(keyHandler));

      act(() => stdin.sendKittySequence(`\x1b[3~`));
      act(() => stdin.sendKittySequence(`\x1b[3~`));

      expect(keyHandler).toHaveBeenNthCalledWith(
        1,
        expect.objectContaining({ name: 'delete' }),
      );
      expect(keyHandler).toHaveBeenNthCalledWith(
        2,
        expect.objectContaining({ name: 'delete' }),
      );
    });

    it('should parse two concatenated tilde-coded sequences in one chunk', async () => {
      const keyHandler = vi.fn();
      const { result } = renderHook(() => useKeypressContext(), { wrapper });
      act(() => result.current.subscribe(keyHandler));

      act(() => stdin.sendKittySequence(`\x1b[3~\x1b[5~`));

      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({ name: 'delete' }),
      );
      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({ name: 'pageup' }),
      );
    });

    it('should ignore incomplete CSI then parse the next complete sequence', async () => {
      const keyHandler = vi.fn();
      const { result } = renderHook(() => useKeypressContext(), { wrapper });
      act(() => result.current.subscribe(keyHandler));

      // Incomplete ESC sequence then a complete Delete
      act(() => {
        // Provide an incomplete ESC sequence chunk with a real ESC character
        stdin.pressKey({
          name: undefined,
          ctrl: false,
          meta: false,
          shift: false,
          sequence: '\x1b[1;',
        });
      });
      act(() => stdin.sendKittySequence(`\x1b[3~`));

      expect(keyHandler).toHaveBeenCalledTimes(1);
      expect(keyHandler).toHaveBeenCalledWith(
        expect.objectContaining({ name: 'delete' }),
      );
    });
  });
});