import { describe, it, expect, vi, beforeEach } from "vitest";
import { render, screen, fireEvent } from "@testing-library/react";
import { UsageIndicator } from "./UsageIndicator";
import * as useUsageDataModule from "../hooks/useUsageData";
import type { ProviderUsage } from "../api";

// Mock the useUsageData hook
vi.mock("../hooks/useUsageData", () => ({
  useUsageData: vi.fn(),
}));

const mockUseUsageData = vi.mocked(useUsageDataModule.useUsageData);

describe("UsageIndicator", () => {
  const mockOnClose = vi.fn();
  const mockRefresh = vi.fn();

  const mockProviders: ProviderUsage[] = [
    {
      name: "Anthropic",
      icon: "🅰️",
      status: "ok",
      plan: "Pro",
      email: "user@example.com",
      windows: [
        {
          label: "Session (5h)",
          percentUsed: 45,
          percentLeft: 55,
          resetText: "resets in 2h 15m",
          resetMs: 8100000,
        },
        {
          label: "Weekly",
          percentUsed: 30,
          percentLeft: 70,
          resetText: "resets in 3d",
          resetMs: 259200000,
        },
      ],
    },
    {
      name: "OpenAI",
      icon: "🤖",
      status: "ok",
      windows: [
        {
          label: "Hourly",
          percentUsed: 75,
          percentLeft: 25,
          resetText: "resets in 45m",
          resetMs: 2700000,
        },
      ],
    },
    {
      name: "Google",
      icon: "🔍",
      status: "no-auth",
      windows: [],
    },
  ];

  beforeEach(() => {
    vi.clearAllMocks();
    // Clear localStorage to ensure clean view mode state
    localStorage.removeItem("kb-usage-view-mode");
  });

  it("renders nothing when isOpen is false", () => {
    mockUseUsageData.mockReturnValue({
      providers: [],
      loading: false,
      error: null,
      lastUpdated: null,
      refresh: mockRefresh,
    });

    const { container } = render(<UsageIndicator isOpen={false} onClose={mockOnClose} />);
    expect(container.firstChild).toBeNull();
  });

  it("renders modal when isOpen is true", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    expect(screen.getByTestId("usage-modal")).toBeInTheDocument();
    expect(screen.getByText("Usage")).toBeInTheDocument();
  });

  it("renders provider cards with correct data", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Check provider names are rendered
    expect(screen.getByText("Anthropic")).toBeInTheDocument();
    expect(screen.getByText("OpenAI")).toBeInTheDocument();
    expect(screen.getByText("Google")).toBeInTheDocument();

    // Check status badges
    expect(screen.getAllByText("Connected").length).toBeGreaterThanOrEqual(1);
    expect(screen.getByText("Not configured")).toBeInTheDocument();

    // Check usage windows
    expect(screen.getByText("Session (5h)")).toBeInTheDocument();
    expect(screen.getByText("Weekly")).toBeInTheDocument();
    expect(screen.getByText("Hourly")).toBeInTheDocument();
  });

  it("shows loading skeleton when loading", () => {
    mockUseUsageData.mockReturnValue({
      providers: [],
      loading: true,
      error: null,
      lastUpdated: null,
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Should show skeleton elements
    expect(document.querySelector(".usage-skeleton")).toBeInTheDocument();
  });

  it("shows error state when there is an error", () => {
    mockUseUsageData.mockReturnValue({
      providers: [],
      loading: false,
      error: "Failed to fetch usage data",
      lastUpdated: null,
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    expect(screen.getByText("Failed to load usage data")).toBeInTheDocument();
    expect(screen.getByText("Failed to fetch usage data")).toBeInTheDocument();
    expect(screen.getByText("Retry")).toBeInTheDocument();
  });

  it("shows skeleton when no providers (empty result after fetch completes)", () => {
    // When useUsageData completes its initial fetch and returns empty providers,
    // we now show the skeleton (not the empty state) to indicate we're waiting
    mockUseUsageData.mockReturnValue({
      providers: [],
      loading: false,
      error: null,
      lastUpdated: null,
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Should show skeleton because initial fetch completed but returned empty
    expect(document.querySelector(".usage-skeleton")).toBeInTheDocument();
  });

  it("calls refresh when refresh button clicked", async () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const refreshBtn = screen.getByTestId("usage-refresh-btn");
    fireEvent.click(refreshBtn);

    expect(mockRefresh).toHaveBeenCalledTimes(1);
  });

  it("calls onClose when close button clicked", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const closeBtn = screen.getByTestId("usage-modal-close");
    fireEvent.click(closeBtn);

    expect(mockOnClose).toHaveBeenCalledTimes(1);
  });

  it("calls onClose when overlay is clicked", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const overlay = screen.getByTestId("usage-modal-overlay");
    fireEvent.click(overlay);

    expect(mockOnClose).toHaveBeenCalledTimes(1);
  });

  it("calls onClose when Escape key is pressed", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    fireEvent.keyDown(document, { key: "Escape" });

    expect(mockOnClose).toHaveBeenCalledTimes(1);
  });

  it("renders progress bars with correct color classes", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { label: "Low Usage", percentUsed: 45, percentLeft: 55, resetText: "1h" },
            { label: "Medium Usage", percentUsed: 75, percentLeft: 25, resetText: "2h" },
            { label: "High Usage", percentUsed: 95, percentLeft: 5, resetText: "3h" },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Check progress bars exist with correct widths
    const progressBars = document.querySelectorAll(".usage-progress-fill");
    expect(progressBars.length).toBe(3);

    // Check color classes are applied
    expect(document.querySelector(".usage-progress-fill--low")).toBeInTheDocument();
    expect(document.querySelector(".usage-progress-fill--medium")).toBeInTheDocument();
    expect(document.querySelector(".usage-progress-fill--high")).toBeInTheDocument();
  });

  it("disables refresh button when loading", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: true,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const refreshBtn = screen.getByTestId("usage-refresh-btn");
    expect(refreshBtn).toBeDisabled();
  });

  it("passes autoRefresh option based on isOpen prop", () => {
    mockUseUsageData.mockReturnValue({
      providers: [],
      loading: false,
      error: null,
      lastUpdated: null,
      refresh: mockRefresh,
    });

    // Reset mock before testing
    mockUseUsageData.mockClear();

    // When isOpen is true, autoRefresh should be true
    const { unmount } = render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    expect(mockUseUsageData).toHaveBeenCalledWith({ autoRefresh: true });

    unmount();

    // Reset mock
    mockUseUsageData.mockClear();

    // When isOpen is false, autoRefresh should be false to prevent polling
    render(<UsageIndicator isOpen={false} onClose={mockOnClose} />);

    // The hook is called even when isOpen is false because hooks must be called
    // unconditionally at the top level in React
    expect(mockUseUsageData).toHaveBeenCalledWith({ autoRefresh: false });
  });

  it("renders provider error messages", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "ErrorProvider",
          icon: "❌",
          status: "error",
          error: "Auth expired — run 'claude' to re-login",
          windows: [],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    expect(screen.getByText("Error")).toBeInTheDocument();
    expect(screen.getByText("Auth expired — run 'claude' to re-login")).toBeInTheDocument();
  });

  it("shows last updated timestamp", () => {
    const lastUpdated = new Date("2024-01-15T10:30:00");
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated,
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    expect(screen.getByText(/Last updated:/)).toBeInTheDocument();
    expect(screen.getByText(/10:30:00/)).toBeInTheDocument();
  });

  it("renders usage windows with correct percentage text", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { label: "Session", percentUsed: 45, percentLeft: 55, resetText: "resets in 2h" },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    expect(screen.getByText("45% used")).toBeInTheDocument();
    expect(screen.getByText("55% left")).toBeInTheDocument();
    expect(screen.getByText("resets in 2h")).toBeInTheDocument();
  });

  // View mode toggle tests
  it("renders view mode toggle buttons with correct initial state", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const usedBtn = screen.getByTestId("usage-view-toggle-used");
    const remainingBtn = screen.getByTestId("usage-view-toggle-remaining");

    expect(usedBtn).toBeInTheDocument();
    expect(remainingBtn).toBeInTheDocument();
    expect(usedBtn).toHaveClass("active");
    expect(remainingBtn).not.toHaveClass("active");
  });

  it("switches view mode when toggle buttons are clicked", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { label: "Session", percentUsed: 45, percentLeft: 55, resetText: "resets in 2h" },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const usedBtn = screen.getByTestId("usage-view-toggle-used");
    const remainingBtn = screen.getByTestId("usage-view-toggle-remaining");

    // Initially shows "used" view
    expect(screen.getByText("45% used")).toBeInTheDocument();

    // Click remaining button
    fireEvent.click(remainingBtn);

    // Now should show "remaining" view
    expect(remainingBtn).toHaveClass("active");
    expect(usedBtn).not.toHaveClass("active");
    expect(screen.getByText("55% remaining")).toBeInTheDocument();
    expect(screen.getByText("45% used")).toBeInTheDocument(); // Footer text

    // Click back to used
    fireEvent.click(usedBtn);

    expect(usedBtn).toHaveClass("active");
    expect(remainingBtn).not.toHaveClass("active");
    expect(screen.getByText("45% used")).toBeInTheDocument();
  });

  it("reads view mode from localStorage on mount", () => {
    // Set localStorage to 'remaining' before rendering
    localStorage.setItem("kb-usage-view-mode", "remaining");

    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { label: "Session", percentUsed: 45, percentLeft: 55, resetText: "resets in 2h" },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const usedBtn = screen.getByTestId("usage-view-toggle-used");
    const remainingBtn = screen.getByTestId("usage-view-toggle-remaining");

    // Should initialize to 'remaining' from localStorage
    expect(remainingBtn).toHaveClass("active");
    expect(usedBtn).not.toHaveClass("active");
    expect(screen.getByText("55% remaining")).toBeInTheDocument();

    // Clean up
    localStorage.removeItem("kb-usage-view-mode");
  });

  it("persists view mode to localStorage when changed", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const remainingBtn = screen.getByTestId("usage-view-toggle-remaining");

    // Click remaining button
    fireEvent.click(remainingBtn);

    // Should save to localStorage
    expect(localStorage.getItem("kb-usage-view-mode")).toBe("remaining");

    // Clean up
    localStorage.removeItem("kb-usage-view-mode");
  });

  // ProviderIcon integration tests
  it("renders SVG provider icons instead of emoji", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        { name: "Anthropic", icon: "🅰️", status: "ok", windows: [] },
        { name: "OpenAI", icon: "🤖", status: "ok", windows: [] },
        { name: "Google", icon: "🔍", status: "ok", windows: [] },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Should render SVG icons with correct provider data attributes
    expect(document.querySelector('[data-provider="anthropic"]')).toBeInTheDocument();
    expect(document.querySelector('[data-provider="openai"]')).toBeInTheDocument();
    expect(document.querySelector('[data-provider="google"]')).toBeInTheDocument();
  });

  it("maps Claude provider to anthropic icon", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        { name: "Claude", icon: "🅰️", status: "ok", windows: [] },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    expect(document.querySelector('[data-provider="anthropic"]')).toBeInTheDocument();
    expect(document.querySelector("svg[aria-label='Anthropic']")).toBeInTheDocument();
  });

  it("maps Codex provider to openai icon", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        { name: "Codex", icon: "🤖", status: "ok", windows: [] },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    expect(document.querySelector('[data-provider="openai"]')).toBeInTheDocument();
    expect(document.querySelector("svg[aria-label='OpenAI']")).toBeInTheDocument();
  });

  it("maps Gemini provider to google icon", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        { name: "Gemini", icon: "🔍", status: "ok", windows: [] },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    expect(document.querySelector('[data-provider="google"]')).toBeInTheDocument();
    expect(document.querySelector("svg[aria-label='Google Gemini']")).toBeInTheDocument();
  });

  // Pace indicator tests
  it("renders pace marker for weekly windows with timing data", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { 
              label: "Weekly", 
              percentUsed: 30, 
              percentLeft: 70, 
              resetText: "resets in 3d",
              resetMs: 259200000, // 3 days remaining
              windowDurationMs: 604800000, // 7 days total
              pace: {
                status: "behind",
                percentElapsed: 57,
                message: "27% under pace",
              },
            },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const paceMarker = document.querySelector('[data-testid="pace-marker"]');
    expect(paceMarker).toBeInTheDocument();
  });

  it("does not render pace marker for non-weekly windows (Session, Hourly)", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { 
              label: "Session (5h)", 
              percentUsed: 45, 
              percentLeft: 55, 
              resetText: "resets in 2h",
              resetMs: 7200000,
              windowDurationMs: 18000000,
            },
            { 
              label: "Hourly", 
              percentUsed: 60, 
              percentLeft: 40, 
              resetText: "resets in 30m",
              resetMs: 1800000,
              windowDurationMs: 3600000,
            },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const paceMarkers = document.querySelectorAll('[data-testid="pace-marker"]');
    expect(paceMarkers.length).toBe(0);
  });

  it("does not render pace marker when pace is undefined", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { 
              label: "Weekly", 
              percentUsed: 30, 
              percentLeft: 70, 
              resetText: "resets in 3d",
              // No pace field
            },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const paceMarker = document.querySelector('[data-testid="pace-marker"]');
    expect(paceMarker).not.toBeInTheDocument();
  });

  it("shows 'ahead of pace' text when usage exceeds elapsed time by >5%", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { 
              label: "Weekly", 
              percentUsed: 70, // 70% used
              percentLeft: 30, 
              resetText: "resets in 3.5d",
              resetMs: 302400000, // 3.5 days remaining out of 7
              windowDurationMs: 604800000, // 7 days total
              pace: {
                status: "ahead",
                percentElapsed: 50,
                message: "20% over pace",
              },
            },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const paceRow = screen.getByTestId("pace-row");
    expect(paceRow).toHaveTextContent(/over pace/);
    expect(paceRow).toHaveTextContent("20%");
  });

  it("shows 'behind pace' text when usage is under elapsed time by >5%", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { 
              label: "Weekly", 
              percentUsed: 20, // 20% used
              percentLeft: 80, 
              resetText: "resets in 3.5d",
              resetMs: 302400000, // 3.5 days remaining out of 7
              windowDurationMs: 604800000, // 7 days total
              pace: {
                status: "behind",
                percentElapsed: 50,
                message: "30% under pace",
              },
            },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const paceRow = screen.getByTestId("pace-row");
    expect(paceRow).toHaveTextContent(/under pace/);
    expect(paceRow).toHaveTextContent("30%");
  });

  it("shows 'on pace' text when usage is within 5% of elapsed time", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { 
              label: "Weekly", 
              percentUsed: 52, // 52% used
              percentLeft: 48, 
              resetText: "resets in 3.5d",
              resetMs: 302400000, // 3.5 days remaining out of 7
              windowDurationMs: 604800000, // 7 days total
              pace: {
                status: "on-track",
                percentElapsed: 50,
                message: "On pace with time elapsed",
              },
            },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    const paceRow = screen.getByTestId("pace-row");
    expect(paceRow).toHaveTextContent(/On pace/);
  });

  it("pace marker position inverts correctly when switching to remaining mode", () => {
    // Mock provider with weekly window
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { 
              label: "Weekly", 
              percentUsed: 30, 
              percentLeft: 70, 
              resetText: "resets in 3.5d",
              resetMs: 302400000, // 50% elapsed
              windowDurationMs: 604800000,
              pace: {
                status: "behind",
                percentElapsed: 50,
                message: "20% under pace",
              },
            },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // In used mode: marker at 50%
    let paceMarker = document.querySelector('[data-testid="pace-marker"]') as HTMLElement;
    expect(paceMarker).toBeInTheDocument();
    expect(paceMarker.style.left).toBe("50%");

    // Switch to remaining mode
    const remainingBtn = screen.getByTestId("usage-view-toggle-remaining");
    fireEvent.click(remainingBtn);

    // In remaining mode: marker at 100 - 50 = 50% (same in this case since it's 50/50)
    paceMarker = document.querySelector('[data-testid="pace-marker"]') as HTMLElement;
    expect(paceMarker.style.left).toBe("50%");
  });

  it("pace percentage text uses backend message directly", () => {
    // Clear localStorage to ensure fresh 'used' mode
    localStorage.removeItem("kb-usage-view-mode");
    
    // Setup: 70% used (ahead of pace), 30% remaining
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { 
              label: "Weekly", 
              percentUsed: 70, // 70% used
              percentLeft: 30, 
              resetText: "resets in 3.5d",
              resetMs: 302400000, // 50% elapsed
              windowDurationMs: 604800000,
              pace: {
                status: "ahead",
                percentElapsed: 50,
                message: "20% over pace",
              },
            },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // In used mode: ahead of pace (70% used vs 50% elapsed)
    let paceRow = screen.getByTestId("pace-row");
    expect(paceRow).toHaveTextContent(/over pace/);

    // Switch to remaining mode - message stays the same (from backend)
    const remainingBtn = screen.getByTestId("usage-view-toggle-remaining");
    fireEvent.click(remainingBtn);

    // The message comes from backend, so it doesn't change based on view mode
    paceRow = screen.getByTestId("pace-row");
    expect(paceRow).toHaveTextContent("20% over pace");
  });

  // Refresh-on-open behavior tests
  it("calls refresh when isOpen transitions from false to true", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: null, // No recent update, should refresh
      refresh: mockRefresh,
    });

    const { rerender } = render(<UsageIndicator isOpen={false} onClose={mockOnClose} />);

    // Initially isOpen is false, refresh should not be called
    expect(mockRefresh).not.toHaveBeenCalled();

    // Open the modal - isOpen transitions to true
    rerender(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // refresh should be called when modal opens
    expect(mockRefresh).toHaveBeenCalledTimes(1);
  });

  it("does not call refresh when isOpen is already true on mount", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    // Render with isOpen=true initially
    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // refresh should NOT be called on initial mount when isOpen is already true
    // (the hook will handle initial data fetch)
    expect(mockRefresh).not.toHaveBeenCalled();
  });

  it("does not call refresh when isOpen becomes false (modal closes)", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    const { rerender } = render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Clear any calls from initial render
    mockRefresh.mockClear();

    // Close the modal - isOpen transitions to false
    rerender(<UsageIndicator isOpen={false} onClose={mockOnClose} />);

    // refresh should NOT be called when modal closes
    expect(mockRefresh).not.toHaveBeenCalled();
  });

  it("skips refresh if data was updated within last 5 seconds", () => {
    // Data was just updated (within 5 seconds)
    const recentUpdate = new Date(Date.now() - 2000); // 2 seconds ago

    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: recentUpdate,
      refresh: mockRefresh,
    });

    const { rerender } = render(<UsageIndicator isOpen={false} onClose={mockOnClose} />);

    // Clear any calls from initial render
    mockRefresh.mockClear();

    // Open the modal
    rerender(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // refresh should NOT be called because data is fresh (within 5 seconds)
    expect(mockRefresh).not.toHaveBeenCalled();
  });

  it("calls refresh when modal opens if data is stale (older than 5 seconds)", () => {
    // Data was updated 10 seconds ago (stale)
    const staleUpdate = new Date(Date.now() - 10000); // 10 seconds ago

    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: staleUpdate,
      refresh: mockRefresh,
    });

    const { rerender } = render(<UsageIndicator isOpen={false} onClose={mockOnClose} />);

    // Clear any calls from initial render
    mockRefresh.mockClear();

    // Open the modal
    rerender(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // refresh should be called because data is stale (older than 5 seconds)
    expect(mockRefresh).toHaveBeenCalledTimes(1);
  });

  it("calls refresh again when modal reopens after being closed", () => {
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: null,
      refresh: mockRefresh,
    });

    const { rerender } = render(<UsageIndicator isOpen={false} onClose={mockOnClose} />);

    // Open the modal first time
    rerender(<UsageIndicator isOpen={true} onClose={mockOnClose} />);
    expect(mockRefresh).toHaveBeenCalledTimes(1);

    // Close the modal
    rerender(<UsageIndicator isOpen={false} onClose={mockOnClose} />);

    // Reopen the modal
    rerender(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // refresh should be called again on reopen
    expect(mockRefresh).toHaveBeenCalledTimes(2);
  });

  // Initial loading state tests
  it("shows skeleton when modal opens with no cached data", () => {
    // Simulate: initial fetch has not completed, providers array is empty
    mockUseUsageData.mockReturnValue({
      providers: [],
      loading: false, // loading is false, but no providers yet
      error: null,
      lastUpdated: null,
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Should show skeleton because initial fetch hasn't completed
    expect(document.querySelector(".usage-skeleton")).toBeInTheDocument();
  });

  it("shows skeleton when modal reopens after being closed with data", () => {
    const { rerender } = render(<UsageIndicator isOpen={false} onClose={mockOnClose} />);

    // First open: show data
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    rerender(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Should show providers, not skeleton
    expect(screen.getByText("Anthropic")).toBeInTheDocument();
    expect(document.querySelector(".usage-skeleton")).not.toBeInTheDocument();

    // Close the modal
    rerender(<UsageIndicator isOpen={false} onClose={mockOnClose} />);

    // Reopen with no providers (simulating stale state before fetch completes)
    mockUseUsageData.mockReturnValue({
      providers: [], // Empty - will show skeleton until fetch completes
      loading: false,
      error: null,
      lastUpdated: null,
      refresh: mockRefresh,
    });

    rerender(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Should show skeleton on reopen until providers arrive
    expect(document.querySelector(".usage-skeleton")).toBeInTheDocument();
  });

  it("shows providers once data arrives after initial skeleton", () => {
    // First render: empty providers, no data yet
    mockUseUsageData.mockReturnValue({
      providers: [],
      loading: false,
      error: null,
      lastUpdated: null,
      refresh: mockRefresh,
    });

    const { rerender } = render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Should show skeleton initially
    expect(document.querySelector(".usage-skeleton")).toBeInTheDocument();

    // Simulate data arriving
    mockUseUsageData.mockReturnValue({
      providers: mockProviders,
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    // Trigger a re-render with new data
    rerender(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Now should show providers
    expect(screen.getByText("Anthropic")).toBeInTheDocument();
    expect(document.querySelector(".usage-skeleton")).not.toBeInTheDocument();
  });

  // Percentage rounding tests
  it("rounds percentage values in display text (whole numbers)", () => {
    // Use decimal percentages to verify rounding
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { label: "Session", percentUsed: 45.678, percentLeft: 54.322, resetText: "resets in 2h" },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Should display rounded values: 46% used, 54% left
    expect(screen.getByText("46% used")).toBeInTheDocument();
    expect(screen.getByText("54% left")).toBeInTheDocument();
  });

  it("rounds percentage values in remaining view mode", () => {
    // Use decimal percentages to verify rounding
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { label: "Session", percentUsed: 33.333, percentLeft: 66.667, resetText: "resets in 3h" },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Switch to remaining mode
    const remainingBtn = screen.getByTestId("usage-view-toggle-remaining");
    fireEvent.click(remainingBtn);

    // Should display rounded values: 67% remaining, 33% used
    expect(screen.getByText("67% remaining")).toBeInTheDocument();
    expect(screen.getByText("33% used")).toBeInTheDocument();
  });

  it("rounds percentage values in progress bar width", () => {
    mockUseUsageData.mockReturnValue({
      providers: [
        {
          name: "TestProvider",
          icon: "🧪",
          status: "ok",
          windows: [
            { label: "Session", percentUsed: 45.678, percentLeft: 54.322, resetText: "resets in 2h" },
          ],
        },
      ],
      loading: false,
      error: null,
      lastUpdated: new Date(),
      refresh: mockRefresh,
    });

    render(<UsageIndicator isOpen={true} onClose={mockOnClose} />);

    // Check progress bar width is rounded
    const progressBar = document.querySelector(".usage-progress-fill") as HTMLElement;
    expect(progressBar).toBeInTheDocument();
    expect(progressBar.style.width).toBe("46%"); // 45.678 rounds to 46
  });
});