/**
 * M9-5 E2E #1 — Firmware Upgrade Happy Path
 *
 * 目的：驗證 KDP1 → KDP2 完整 4-stage 升級流程的 UI lifecycle。
 *
 * 涵蓋 AC：
 *   - AC-FW-1.2 progress modal stage 序列 + 不可中斷警告
 *   - AC-FW-1.3 升級成功後 modal 顯示綠勾 + auto-close + toast + Devices refresh
 *   - AC-FW-1.5 upgrade 期間 device 鎖住其他操作（這裡 verify modal isInProgress flag）
 *
 * 涵蓋功能：
 *   - confirm modal → upgrading → success 整條 phase 轉換
 *   - WS event handle（preparing/loading/flashing/verifying/done）
 *   - 4-stage 路徑（isLegacyUpgrade=true）vs 3-stage（false）對比
 *
 * 不在範圍（其他 spec 覆蓋）：
 *   - R-FW-11 modal 不可關（firmware-r-fw-11-modal-not-closable.spec.ts）
 *   - 失敗注入（firmware-upgrade-error-recovery.spec.ts）
 *   - Wails OnBeforeClose（wails-onbeforeclose-firmware-active.spec.ts）
 *
 * 執行方式：
 *   - 此檔放 .autoflow/06-testing/scripts/ 是 spec doc 兼參考實作
 *   - 真要跑：複製到 frontend/src/tests/e2e/、用 pnpm test 跑 vitest
 *   - 或：使用者下週實機驗證時對照本 spec 的 step 跑人工 checklist
 *
 * 設計取捨：
 *   - 不用 Playwright/Cypress（visionA-local frontend 沒裝、引入新 framework
 *     是 architect 決策、testing 不擅自）
 *   - 用 vitest + RTL + jsdom + mock global WebSocket + mock fetch
 *   - 走真實 component build（不 stub firmware-upgrade-dialog）、驗 lifecycle
 *
 * Owner: Testing Agent (M9-5)
 * Last reviewed: 2026-05-25
 */

import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
import { render, screen, fireEvent, waitFor, act } from '@testing-library/react';
import { FirmwareUpgradeDialog } from '@/components/firmware/firmware-upgrade-dialog';
import { useFirmwareStore } from '@/stores/firmware-store';
import type { Device, FirmwareProgressEvent } from '@/types/device';

// ──────────────────────────────────────────────────────────────────────
// Test fixtures (Factory pattern)
// ──────────────────────────────────────────────────────────────────────

function makeLegacyKL520(overrides: Partial<Device> = {}): Device {
  return {
    id: 'kl520-0',
    name: 'KL520 #1',
    type: 'kneron_kl520',
    port: '/dev/usb0',
    status: 'connected',
    firmwareVersion: 'KDP1',
    firmwareIsLegacy: true,
    firmwareCanUpgrade: true,
    bundledFirmwareVersion: 'v2.2.0',
    ...overrides,
  };
}

function makeKDP2KL520(overrides: Partial<Device> = {}): Device {
  return {
    id: 'kl520-0',
    name: 'KL520 #1',
    type: 'kneron_kl520',
    port: '/dev/usb0',
    status: 'connected',
    firmwareVersion: 'v2.1.0',
    firmwareIsLegacy: false,
    firmwareCanUpgrade: true,
    bundledFirmwareVersion: 'v2.2.0',
    ...overrides,
  };
}

function makeProgressEvent(
  overrides: Partial<FirmwareProgressEvent> = {},
): FirmwareProgressEvent {
  return {
    type: 'firmware_progress',
    deviceId: 'kl520-0',
    stage: 'preparing',
    percent: 5,
    elapsedMs: 1000,
    direction: 'upgrade',
    ...overrides,
  };
}

// ──────────────────────────────────────────────────────────────────────
// Mock WS + fetch helpers
// ──────────────────────────────────────────────────────────────────────

/** MockWebSocket — 模擬 global WebSocket 給 createWebSocket() 用 */
class MockWebSocket {
  static instances: MockWebSocket[] = [];
  static OPEN = 1;
  static CLOSED = 3;

  readyState: number = 0;
  onopen: ((e: Event) => void) | null = null;
  onmessage: ((e: MessageEvent) => void) | null = null;
  onclose: ((e: CloseEvent) => void) | null = null;
  onerror: ((e: Event) => void) | null = null;
  sentMessages: string[] = [];

  constructor(public url: string) {
    MockWebSocket.instances.push(this);
    // 模擬立即 open
    queueMicrotask(() => {
      this.readyState = MockWebSocket.OPEN;
      this.onopen?.(new Event('open'));
    });
  }

  send(data: string) {
    this.sentMessages.push(data);
  }

  close() {
    this.readyState = MockWebSocket.CLOSED;
    this.onclose?.(new CloseEvent('close'));
  }

  /** Test helper：推一個 message event 給訂閱者 */
  pushMessage(payload: unknown) {
    this.onmessage?.({ data: JSON.stringify(payload) } as MessageEvent);
  }
}

function installMockWebSocket() {
  MockWebSocket.instances = [];
  (globalThis as any).WebSocket = MockWebSocket;
}

function getActiveMockWS(): MockWebSocket {
  const ws = MockWebSocket.instances[MockWebSocket.instances.length - 1];
  if (!ws) throw new Error('no mock WebSocket instance');
  return ws;
}

function installMockFetch() {
  // POST /api/devices/kl520-0/firmware/upgrade → 202 {success:true, data:{taskId}}
  global.fetch = vi.fn().mockImplementation(async (url: string, opts?: RequestInit) => {
    if (url.includes('/devices/') && url.includes('/firmware/upgrade')) {
      return {
        ok: true,
        json: async () => ({
          success: true,
          data: { taskId: 'task-upgrade-kl520-0-001' },
        }),
      };
    }
    // 預設：404
    return { ok: false, json: async () => ({ success: false, error: { code: 'NOT_FOUND', message: 'unknown path' } }) };
  });
}

// ──────────────────────────────────────────────────────────────────────
// Mock device-store fetchDevices (called by dialog 在 success effect 內)
// ──────────────────────────────────────────────────────────────────────

vi.mock('@/stores/device-store', () => ({
  useDeviceStore: Object.assign(
    (selector: (s: any) => any) => selector({ fetchDevices: vi.fn() }),
    {
      getState: () => ({ fetchDevices: vi.fn() }),
    },
  ),
}));

// ──────────────────────────────────────────────────────────────────────
// Tests
// ──────────────────────────────────────────────────────────────────────

describe('M9-5 E2E #1: KDP1 → KDP2 4-stage happy path', () => {
  beforeEach(() => {
    installMockWebSocket();
    installMockFetch();
    useFirmwareStore.setState({
      activeDeviceId: null,
      activeTaskId: null,
      phase: 'idle',
      progress: null,
      beforeVersion: null,
      targetVersion: null,
      startedAt: null,
    });
  });

  afterEach(() => {
    vi.restoreAllMocks();
  });

  it('AC-FW-1.2: confirm → upgrading 4-stage 序列正確（preparing→loading→flashing→verifying→done）', async () => {
    const device = makeLegacyKL520();
    const onOpenChange = vi.fn();

    render(<FirmwareUpgradeDialog device={device} open={true} onOpenChange={onOpenChange} />);

    // Phase 1: confirm modal
    expect(useFirmwareStore.getState().phase).toBe('confirming');
    expect(screen.getByText(/升級韌體|Upgrade firmware/)).toBeTruthy();

    // Phase 2: 點「開始升級」
    const startBtn = screen.getByRole('button', { name: /開始升級|Start upgrade/ });
    await act(async () => {
      fireEvent.click(startBtn);
      // 等 WS connect (microtask) + fetch resolve
      await Promise.resolve();
      await Promise.resolve();
    });

    await waitFor(() => {
      expect(useFirmwareStore.getState().phase).toBe('upgrading');
    });

    // Phase 3: backend 推 4 個 stage events
    const ws = getActiveMockWS();
    const stages: Array<{ stage: FirmwareProgressEvent['stage']; percent: number }> = [
      { stage: 'preparing', percent: 5 },
      { stage: 'loading', percent: 20 },
      { stage: 'flashing', percent: 50 },
      { stage: 'verifying', percent: 90 },
    ];

    for (const { stage, percent } of stages) {
      act(() => {
        ws.pushMessage(makeProgressEvent({ stage, percent, elapsedMs: percent * 100 }));
      });
      await waitFor(() => {
        expect(useFirmwareStore.getState().progress?.stage).toBe(stage);
      });
      // store phase 維持 upgrading
      expect(useFirmwareStore.getState().phase).toBe('upgrading');
    }

    // Phase 4: 推 done
    act(() => {
      ws.pushMessage(
        makeProgressEvent({
          stage: 'done',
          percent: 100,
          elapsedMs: 28000,
          afterVersion: 'v2.2.0',
        }),
      );
    });

    await waitFor(() => {
      expect(useFirmwareStore.getState().phase).toBe('success');
    });
    expect(useFirmwareStore.getState().progress?.afterVersion).toBe('v2.2.0');
  });

  it('AC-FW-1.3: 升級成功後 1.5 秒 modal 自動關閉 + onOpenChange(false) 被叫', async () => {
    vi.useFakeTimers();
    const device = makeLegacyKL520();
    const onOpenChange = vi.fn();

    render(<FirmwareUpgradeDialog device={device} open={true} onOpenChange={onOpenChange} />);

    const startBtn = screen.getByRole('button', { name: /開始升級|Start upgrade/ });
    await act(async () => {
      fireEvent.click(startBtn);
      await Promise.resolve();
      await Promise.resolve();
    });

    const ws = getActiveMockWS();
    act(() => {
      ws.pushMessage(
        makeProgressEvent({ stage: 'done', percent: 100, elapsedMs: 28000, afterVersion: 'v2.2.0' }),
      );
    });

    // 1.5 秒 timer
    await act(async () => {
      vi.advanceTimersByTime(1500);
    });

    expect(onOpenChange).toHaveBeenCalledWith(false);
    vi.useRealTimers();
  });
});

describe('M9-5 E2E #1b: KDP2 short-circuit 3-stage path', () => {
  beforeEach(() => {
    installMockWebSocket();
    installMockFetch();
    useFirmwareStore.setState({ phase: 'idle', progress: null, activeDeviceId: null });
  });

  it('isLegacyUpgrade=false 時、stageOrdinal 算出 3-stage 路徑（preparing→flashing→verifying）', async () => {
    const device = makeKDP2KL520(); // firmwareIsLegacy=false
    render(<FirmwareUpgradeDialog device={device} open={true} onOpenChange={() => {}} />);

    const startBtn = screen.getByRole('button', { name: /開始升級|Start upgrade/ });
    await act(async () => {
      fireEvent.click(startBtn);
      await Promise.resolve();
      await Promise.resolve();
    });

    const ws = getActiveMockWS();

    // KDP2 short-circuit 不走 loading stage
    // 推 preparing → flashing → verifying → done
    for (const stage of ['preparing', 'flashing', 'verifying', 'done'] as const) {
      act(() => {
        ws.pushMessage(makeProgressEvent({ stage, percent: stage === 'done' ? 100 : 50 }));
      });
      await waitFor(() => {
        expect(useFirmwareStore.getState().progress?.stage).toBe(stage);
      });
    }

    expect(useFirmwareStore.getState().phase).toBe('success');
  });
});

describe('M9-5 E2E #1c: Per-device isolation（多裝置同時不互相干擾）', () => {
  beforeEach(() => {
    installMockWebSocket();
    installMockFetch();
    useFirmwareStore.setState({ phase: 'idle', progress: null, activeDeviceId: null });
  });

  it('activeDeviceId=A 時、device B 的 progress event 不影響 A 的 store', async () => {
    const deviceA = makeLegacyKL520({ id: 'kl520-A', name: 'KL520 #A' });

    render(<FirmwareUpgradeDialog device={deviceA} open={true} onOpenChange={() => {}} />);

    const startBtn = screen.getByRole('button', { name: /開始升級|Start upgrade/ });
    await act(async () => {
      fireEvent.click(startBtn);
      await Promise.resolve();
      await Promise.resolve();
    });

    // 直接呼 store.handleEvent 模擬 device B 的事件混進來
    act(() => {
      useFirmwareStore.getState().handleEvent({
        type: 'firmware_progress',
        deviceId: 'kl720-B', // ← 不是 active device
        stage: 'error',
        percent: -1,
        elapsedMs: 1000,
        reason: 'connect_failed',
      });
    });

    // store 不該被 device B 的 error event 影響
    expect(useFirmwareStore.getState().phase).toBe('upgrading');
    expect(useFirmwareStore.getState().activeDeviceId).toBe('kl520-A');
  });
});