import { describe, it, expect, vi, beforeEach } from "vitest";
import { render, screen, fireEvent, waitFor } from "@testing-library/react";
import { PrPanel } from "../PrPanel";

vi.mock("../../api", () => ({
  refreshPrStatus: vi.fn(),
}));

import { refreshPrStatus } from "../../api";

const mockAddToast = vi.fn();
const mockOnPrUpdated = vi.fn();
const mockOnRequestCreatePr = vi.fn();

const mockPrInfo = {
  url: "https://github.com/owner/repo/pull/42",
  number: 42,
  status: "open" as const,
  title: "Fix the bug",
  headBranch: "fusion/fn-001",
  baseBranch: "main",
  commentCount: 3,
  lastCommentAt: "2026-01-01T00:00:00.000Z",
};

describe("PrPanel", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it("renders create button and calls onRequestCreatePr", () => {
    render(
      <PrPanel
        taskId="FN-001"
        prAuthAvailable={true}
        onRequestCreatePr={mockOnRequestCreatePr}
        onPrUpdated={mockOnPrUpdated}
        addToast={mockAddToast}
      />
    );

    fireEvent.click(screen.getByRole("button", { name: /Create PR/i }));
    expect(mockOnRequestCreatePr).toHaveBeenCalledTimes(1);
  });

  it("does not render input or textarea in no-PR state", () => {
    render(<PrPanel taskId="FN-001" prAuthAvailable={true} onRequestCreatePr={mockOnRequestCreatePr} onPrUpdated={mockOnPrUpdated} addToast={mockAddToast} />);
    expect(document.querySelector("input")).toBeNull();
    expect(document.querySelector("textarea")).toBeNull();
  });

  it("disables create button and shows auth hint when pr auth unavailable", () => {
    render(<PrPanel taskId="FN-001" prAuthAvailable={false} onRequestCreatePr={mockOnRequestCreatePr} onPrUpdated={mockOnPrUpdated} addToast={mockAddToast} />);
    const button = screen.getByRole("button", { name: /Create PR/i }) as HTMLButtonElement;
    expect(button.disabled).toBe(true);
    expect(screen.getByText(/gh auth login/i)).toBeInTheDocument();
  });

  it("shows creating-pr automation hint", () => {
    render(<PrPanel taskId="FN-001" automationStatus="creating-pr" prAuthAvailable={true} onPrUpdated={mockOnPrUpdated} addToast={mockAddToast} />);
    expect(screen.getByText(/creating a pull request automatically/i)).toBeInTheDocument();
    expect(screen.queryByRole("button", { name: /Create PR/i })).toBeNull();
  });

  it("shows autoMerge hint in no-PR state", () => {
    render(<PrPanel taskId="FN-001" autoMerge={true} prAuthAvailable={true} onPrUpdated={mockOnPrUpdated} addToast={mockAddToast} />);
    expect(screen.getByText(/Auto-merge will handle this task automatically./i)).toBeInTheDocument();
  });

  it("renders PR details when prInfo exists", () => {
    render(<PrPanel taskId="FN-001" prInfo={mockPrInfo} prAuthAvailable={true} onPrUpdated={mockOnPrUpdated} addToast={mockAddToast} />);
    expect(screen.getByText("#42")).toBeInTheDocument();
    expect(screen.getByText("open")).toBeInTheDocument();
    expect(screen.getByText("fusion/fn-001")).toBeInTheDocument();
    expect(screen.getByText("main")).toBeInTheDocument();
    expect(screen.getByText("3")).toBeInTheDocument();
    expect(screen.getByRole("link", { name: /View on GitHub/i })).toBeInTheDocument();
  });

  it("refreshes PR status and updates toast/callback", async () => {
    (refreshPrStatus as ReturnType<typeof vi.fn>).mockResolvedValue({
      prInfo: { ...mockPrInfo, status: "merged" },
      checks: [],
      reviewDecision: null,
      blockingReasons: [],
    });

    render(<PrPanel taskId="FN-001" projectId="project-1" prInfo={mockPrInfo} prAuthAvailable={true} onPrUpdated={mockOnPrUpdated} addToast={mockAddToast} />);

    fireEvent.click(screen.getByTitle("Refresh PR status"));

    await waitFor(() => {
      expect(refreshPrStatus).toHaveBeenCalledWith("FN-001", "project-1");
    });
    expect(mockOnPrUpdated).toHaveBeenCalledWith(expect.objectContaining({ status: "merged" }));
    expect(mockAddToast).toHaveBeenCalledWith("PR status refreshed", "success");
  });

  it("renders checks rollup and details after refresh", async () => {
    (refreshPrStatus as ReturnType<typeof vi.fn>).mockResolvedValue({
      prInfo: mockPrInfo,
      checks: [
        { name: "build", required: true, state: "success" },
        { name: "lint", required: false, state: "failure" },
        { name: "e2e", required: true, state: "pending" },
      ],
      reviewDecision: null,
      blockingReasons: [],
    });

    render(<PrPanel taskId="FN-001" prInfo={mockPrInfo} prAuthAvailable={true} onPrUpdated={mockOnPrUpdated} addToast={mockAddToast} />);
    fireEvent.click(screen.getByTitle("Refresh PR status"));

    await screen.findByText("1 passing");
    expect(screen.getByText("1 failing")).toBeInTheDocument();
    expect(screen.getByText("1 pending")).toBeInTheDocument();

    fireEvent.click(screen.getByText(/Recent checks/i));
    expect(screen.getByText("build")).toBeInTheDocument();
    expect(screen.getByText("lint")).toBeInTheDocument();
    expect(screen.getByText("e2e")).toBeInTheDocument();
    expect(screen.getAllByText("Required").length).toBe(2);
  });

  it("renders review decision states", async () => {
    (refreshPrStatus as ReturnType<typeof vi.fn>)
      .mockResolvedValueOnce({ prInfo: mockPrInfo, checks: [], reviewDecision: "CHANGES_REQUESTED", blockingReasons: [] })
      .mockResolvedValueOnce({ prInfo: mockPrInfo, checks: [], reviewDecision: "APPROVED", blockingReasons: [] })
      .mockResolvedValueOnce({ prInfo: mockPrInfo, checks: [], reviewDecision: null, blockingReasons: [] });

    render(<PrPanel taskId="FN-001" prInfo={mockPrInfo} prAuthAvailable={true} onPrUpdated={mockOnPrUpdated} addToast={mockAddToast} />);

    fireEvent.click(screen.getByTitle("Refresh PR status"));
    expect(await screen.findByText("CHANGES_REQUESTED")).toBeInTheDocument();

    fireEvent.click(screen.getByTitle("Refresh PR status"));
    expect(await screen.findByText("APPROVED")).toBeInTheDocument();

    fireEvent.click(screen.getByTitle("Refresh PR status"));
    expect(await screen.findByText("No reviews yet")).toBeInTheDocument();
  });

  it("shows error toast when refresh fails", async () => {
    (refreshPrStatus as ReturnType<typeof vi.fn>).mockRejectedValue(new Error("refresh failed"));

    render(<PrPanel taskId="FN-001" prInfo={mockPrInfo} prAuthAvailable={true} onPrUpdated={mockOnPrUpdated} addToast={mockAddToast} />);
    fireEvent.click(screen.getByTitle("Refresh PR status"));

    await waitFor(() => {
      expect(mockAddToast).toHaveBeenCalledWith("refresh failed", "error");
    });
    expect(mockOnPrUpdated).not.toHaveBeenCalled();
  });
});