/**
 * @license
 * Copyright 2025 AionUi (aionui.com)
 * SPDX-License-Identifier: Apache-2.0
 */

import { act, renderHook, waitFor } from '@testing-library/react';
import { beforeEach, describe, expect, it, vi } from 'vitest';
import { useAcpMessage } from '@/renderer/pages/conversation/platforms/acp/useAcpMessage';
import { getConversationOrNull } from '@/renderer/pages/conversation/utils/conversationCache';
import { resetEnsureConversationRuntimeStateForTests } from '@/renderer/pages/conversation/utils/ensureConversationRuntime';
import type { IResponseMessage } from '@/common/adapter/ipcBridge';

const {
  addOrUpdateMessageMock,
  ensureRuntimeInvokeMock,
  getSlashCommandsInvokeMock,
  responseStreamOnMock,
  responseStreamHandlerRef,
} = vi.hoisted(() => ({
  addOrUpdateMessageMock: vi.fn(),
  ensureRuntimeInvokeMock: vi.fn(),
  getSlashCommandsInvokeMock: vi.fn(),
  responseStreamOnMock: vi.fn(),
  responseStreamHandlerRef: {
    current: undefined as ((message: IResponseMessage) => void) | undefined,
  },
}));

vi.mock('@/renderer/pages/conversation/Messages/hooks', () => ({
  useAddOrUpdateMessage: () => addOrUpdateMessageMock,
  useMergeLiveMessage: () => addOrUpdateMessageMock,
}));

vi.mock('@/renderer/pages/conversation/utils/conversationCache', () => ({
  getConversationOrNull: vi.fn(),
}));

vi.mock('@/common', () => ({
  ipcBridge: {
    acpConversation: {
      responseStream: {
        on: responseStreamOnMock.mockImplementation((handler: (message: IResponseMessage) => void) => {
          responseStreamHandlerRef.current = handler;
          return vi.fn();
        }),
      },
    },
    conversation: {
      ensureRuntime: {
        invoke: ensureRuntimeInvokeMock,
      },
      getSlashCommands: {
        invoke: getSlashCommandsInvokeMock,
      },
    },
  },
}));

function deferred<T>() {
  let resolve!: (value: T | PromiseLike<T>) => void;
  let reject!: (reason?: unknown) => void;
  const promise = new Promise<T>((res, rej) => {
    resolve = res;
    reject = rej;
  });
  return { promise, resolve, reject };
}

describe('useAcpMessage', () => {
  beforeEach(() => {
    vi.clearAllMocks();
    resetEnsureConversationRuntimeStateForTests();
    ensureRuntimeInvokeMock.mockResolvedValue({ recovered: false, config_options: [], runtime: null });
    getSlashCommandsInvokeMock.mockResolvedValue([]);
    responseStreamHandlerRef.current = undefined;
  });

  it('completes hydration when the conversation lookup fails', async () => {
    vi.mocked(getConversationOrNull).mockRejectedValue(new TypeError('Failed to fetch'));

    const { result } = renderHook(() => useAcpMessage('conv-1'));

    await waitFor(() => {
      expect(result.current.hasHydratedRunningState).toBe(true);
    });

    expect(result.current.running).toBe(false);
    expect(result.current.aiProcessing).toBe(false);
  });

  it('emits a synthetic thinking done update on finish when the stream never sends one', async () => {
    vi.mocked(getConversationOrNull).mockResolvedValue(null);

    const now = Date.now();
    renderHook(() => useAcpMessage('conv-1'));

    expect(responseStreamHandlerRef.current).toBeTypeOf('function');

    responseStreamHandlerRef.current?.({
      type: 'request_trace',
      data: {
        timestamp: now - 4200,
        backend: 'claude',
        model_id: 'model-1',
      },
      msg_id: 'msg-1',
      conversation_id: 'conv-1',
    });

    responseStreamHandlerRef.current?.({
      type: 'thinking',
      data: {
        content: 'alpha',
        status: 'thinking',
      },
      msg_id: 'msg-1',
      conversation_id: 'conv-1',
    });

    responseStreamHandlerRef.current?.({
      type: 'finish',
      data: null,
      msg_id: 'msg-1',
      conversation_id: 'conv-1',
    });

    expect(addOrUpdateMessageMock).toHaveBeenCalledWith(
      expect.objectContaining({
        type: 'thinking',
        msg_id: 'msg-1',
        conversation_id: 'conv-1',
        content: expect.objectContaining({
          status: 'done',
          duration: expect.any(Number),
        }),
      })
    );
  });

  it('completes thinking as soon as the first non-thinking message arrives', async () => {
    vi.mocked(getConversationOrNull).mockResolvedValue(null);

    renderHook(() => useAcpMessage('conv-1'));

    responseStreamHandlerRef.current?.({
      type: 'thinking',
      data: {
        content: 'alpha',
        status: 'thinking',
      },
      msg_id: 'msg-1',
      conversation_id: 'conv-1',
      created_at: 1_000,
    });

    responseStreamHandlerRef.current?.({
      type: 'text',
      data: 'beta',
      msg_id: 'msg-1',
      conversation_id: 'conv-1',
      created_at: 4_200,
    });

    expect(addOrUpdateMessageMock).toHaveBeenNthCalledWith(
      1,
      expect.objectContaining({
        type: 'thinking',
        msg_id: 'msg-1',
        content: expect.objectContaining({
          status: 'thinking',
        }),
      })
    );
    expect(addOrUpdateMessageMock).toHaveBeenNthCalledWith(
      2,
      expect.objectContaining({
        type: 'thinking',
        msg_id: 'msg-1',
        content: expect.objectContaining({
          status: 'done',
          duration: 3200,
        }),
      })
    );
    expect(addOrUpdateMessageMock).toHaveBeenNthCalledWith(
      3,
      expect.objectContaining({
        type: 'text',
        msg_id: 'msg-1',
      })
    );
  });

  it('preserves slash-command metadata from available_commands stream updates', async () => {
    vi.mocked(getConversationOrNull).mockResolvedValue(null);

    const { result } = renderHook(() => useAcpMessage('conv-1'));

    act(() => {
      responseStreamHandlerRef.current?.({
        type: 'available_commands',
        data: {
          commands: [
            {
              name: 'review',
              description: 'Review the current diff',
              input: {
                hint: '⌘R',
              },
              _meta: {
                completion_behavior: 'neutral_tip_on_empty',
                empty_turn_tip_code: 'acp.empty_turn.choose_command',
                empty_turn_tip_params: {
                  command_count: 1,
                },
              },
            },
          ],
        },
        msg_id: 'cmd-1',
        conversation_id: 'conv-1',
      });
    });

    await waitFor(() => {
      expect(result.current.slashCommands).toEqual([
        {
          name: 'review',
          description: 'Review the current diff',
          hint: '⌘R',
          kind: 'template',
          source: 'acp',
          selectionBehavior: 'insert',
          completionBehavior: 'neutral_tip_on_empty',
          emptyTurnTipCode: 'acp.empty_turn.choose_command',
          emptyTurnTipParams: {
            command_count: 1,
          },
        },
      ]);
    });
  });

  it('loads initial slash commands after runtime ensure without legacy warmup', async () => {
    vi.mocked(getConversationOrNull).mockResolvedValue(null);
    getSlashCommandsInvokeMock.mockResolvedValue([
      {
        command: 'review',
        description: 'Review the current diff',
        completion_behavior: 'neutral_tip_on_empty',
      },
    ]);

    const { result } = renderHook(() => useAcpMessage('conv-1'));

    await waitFor(() => {
      expect(ensureRuntimeInvokeMock).toHaveBeenCalledWith({ conversation_id: 'conv-1' });
      expect(getSlashCommandsInvokeMock).toHaveBeenCalledWith({ conversation_id: 'conv-1' });
    });
    await waitFor(() => {
      expect(result.current.slashCommands).toEqual([
        {
          name: 'review',
          description: 'Review the current diff',
          kind: 'template',
          source: 'acp',
          selectionBehavior: 'insert',
          completionBehavior: 'neutral_tip_on_empty',
        },
      ]);
    });
  });

  it('uses injected runtime preparation for initial slash commands in team mode', async () => {
    vi.mocked(getConversationOrNull).mockResolvedValue(null);
    const prepareRuntime = vi.fn().mockResolvedValue(undefined);
    getSlashCommandsInvokeMock.mockResolvedValue([
      {
        command: 'review',
        description: 'Review the current diff',
      },
    ]);

    const { result } = renderHook(() => useAcpMessage('conv-1', { prepareRuntime }));

    await waitFor(() => {
      expect(prepareRuntime).toHaveBeenCalled();
      expect(getSlashCommandsInvokeMock).toHaveBeenCalledWith({ conversation_id: 'conv-1' });
    });
    expect(ensureRuntimeInvokeMock).not.toHaveBeenCalled();

    act(() => {
      result.current.fetchSlashCommands();
    });

    await waitFor(() => {
      expect(prepareRuntime).toHaveBeenCalledTimes(2);
    });
    expect(ensureRuntimeInvokeMock).not.toHaveBeenCalled();
  });

  it('deduplicates slash command fetches while a request is in flight', async () => {
    vi.mocked(getConversationOrNull).mockResolvedValue(null);
    const slashCommandsDeferred = deferred<
      Array<{
        command: string;
        description: string;
      }>
    >();
    getSlashCommandsInvokeMock.mockReturnValue(slashCommandsDeferred.promise);

    const { result } = renderHook(() => useAcpMessage('conv-1'));

    await waitFor(() => {
      expect(getSlashCommandsInvokeMock).toHaveBeenCalledTimes(1);
    });

    act(() => {
      result.current.fetchSlashCommands();
    });

    await waitFor(() => {
      expect(getSlashCommandsInvokeMock).toHaveBeenCalledTimes(1);
    });

    await act(async () => {
      slashCommandsDeferred.resolve([
        {
          command: 'review',
          description: 'Review the current diff',
        },
      ]);
      await slashCommandsDeferred.promise;
    });

    await waitFor(() => {
      expect(result.current.slashCommands).toEqual([
        {
          name: 'review',
          description: 'Review the current diff',
          kind: 'template',
          source: 'acp',
          selectionBehavior: 'insert',
        },
      ]);
    });
  });

  it('normalizes team teammate messages before inserting them into the message list', async () => {
    vi.mocked(getConversationOrNull).mockResolvedValue(null);

    renderHook(() => useAcpMessage('leader-conversation-1'));

    act(() => {
      responseStreamHandlerRef.current?.({
        type: 'teammate_message',
        data: {
          id: 'projected-message-1',
          type: 'text',
          msg_id: 'projected-message-1',
          conversation_id: 'leader-conversation-1',
          position: 'left',
          status: 'finish',
          content: {
            content: '[Codex Assistant] idle',
            teammate_message: true,
            sender_name: 'Codex Assistant',
            sender_backend: 'codex',
            sender_conversation_id: 'teammate-conversation-1',
          },
        },
        msg_id: 'projected-message-1',
        conversation_id: 'leader-conversation-1',
      } as unknown as IResponseMessage);
    });

    expect(addOrUpdateMessageMock).toHaveBeenCalledWith(
      expect.objectContaining({
        type: 'text',
        msg_id: 'projected-message-1',
        conversation_id: 'leader-conversation-1',
        content: {
          content: '[Codex Assistant] idle',
          teammateMessage: true,
          senderName: 'Codex Assistant',
          senderAgentType: 'codex',
          senderConversationId: 'teammate-conversation-1',
        },
      })
    );
  });
});