/**
 * @vitest-environment jsdom
 */
import { cleanup, render, screen, waitFor } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { apiClient } from "../api/client";

vi.mock("../api/client", () => ({
	apiClient: {
		getAuthHeader: vi.fn(),
	},
	ApiClientError: class ApiClientError extends Error {
		constructor(
			message: string,
			public status: number,
			public code?: string,
		) {
			super(message);
			this.name = "ApiClientError";
		}
	},
}));

// Import after mock is set up
import { EditNoteTypeModal } from "./EditNoteTypeModal";

// Mock fetch globally
const mockFetch = vi.fn();
global.fetch = mockFetch;

describe("EditNoteTypeModal", () => {
	const mockNoteType = {
		id: "note-type-123",
		name: "Basic",
		frontTemplate: "{{Front}}",
		backTemplate: "{{Back}}",
		isReversible: false,
	};

	const defaultProps = {
		isOpen: true,
		noteType: mockNoteType,
		onClose: vi.fn(),
		onNoteTypeUpdated: vi.fn(),
	};

	beforeEach(() => {
		vi.clearAllMocks();
		vi.mocked(apiClient.getAuthHeader).mockReturnValue({
			Authorization: "Bearer access-token",
		});
	});

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

	it("does not render when closed", () => {
		render(<EditNoteTypeModal {...defaultProps} isOpen={false} />);

		expect(screen.queryByRole("dialog")).toBeNull();
	});

	it("does not render when noteType is null", () => {
		render(<EditNoteTypeModal {...defaultProps} noteType={null} />);

		expect(screen.queryByRole("dialog")).toBeNull();
	});

	it("renders modal when open with noteType", () => {
		render(<EditNoteTypeModal {...defaultProps} />);

		expect(screen.getByRole("dialog")).toBeDefined();
		expect(
			screen.getByRole("heading", { name: "Edit Note Type" }),
		).toBeDefined();
		expect(screen.getByLabelText("Name")).toBeDefined();
		expect(screen.getByLabelText("Front Template")).toBeDefined();
		expect(screen.getByLabelText("Back Template")).toBeDefined();
		expect(screen.getByLabelText("Create reversed cards")).toBeDefined();
		expect(screen.getByRole("button", { name: "Cancel" })).toBeDefined();
		expect(screen.getByRole("button", { name: "Save Changes" })).toBeDefined();
	});

	it("populates form with noteType data", () => {
		render(<EditNoteTypeModal {...defaultProps} />);

		expect(screen.getByLabelText("Name")).toHaveProperty("value", "Basic");
		expect(screen.getByLabelText("Front Template")).toHaveProperty(
			"value",
			"{{Front}}",
		);
		expect(screen.getByLabelText("Back Template")).toHaveProperty(
			"value",
			"{{Back}}",
		);
		expect(screen.getByLabelText("Create reversed cards")).toHaveProperty(
			"checked",
			false,
		);
	});

	it("populates form with reversible noteType", () => {
		const reversibleNoteType = {
			...mockNoteType,
			isReversible: true,
		};

		render(
			<EditNoteTypeModal {...defaultProps} noteType={reversibleNoteType} />,
		);

		expect(screen.getByLabelText("Create reversed cards")).toHaveProperty(
			"checked",
			true,
		);
	});

	it("disables save button when name is empty", async () => {
		const user = userEvent.setup();
		render(<EditNoteTypeModal {...defaultProps} />);

		const nameInput = screen.getByLabelText("Name");
		await user.clear(nameInput);

		const saveButton = screen.getByRole("button", { name: "Save Changes" });
		expect(saveButton).toHaveProperty("disabled", true);
	});

	it("calls onClose when Cancel is clicked", async () => {
		const user = userEvent.setup();
		const onClose = vi.fn();
		render(<EditNoteTypeModal {...defaultProps} onClose={onClose} />);

		await user.click(screen.getByRole("button", { name: "Cancel" }));

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

	it("calls onClose when clicking outside the modal", async () => {
		const user = userEvent.setup();
		const onClose = vi.fn();
		render(<EditNoteTypeModal {...defaultProps} onClose={onClose} />);

		const dialog = screen.getByRole("dialog");
		await user.click(dialog);

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

	it("updates noteType when Save Changes is clicked", async () => {
		const user = userEvent.setup();
		const onClose = vi.fn();
		const onNoteTypeUpdated = vi.fn();

		mockFetch.mockResolvedValue({
			ok: true,
			json: async () => ({
				noteType: {
					...mockNoteType,
					name: "Updated Basic",
					isReversible: true,
				},
			}),
		});

		render(
			<EditNoteTypeModal
				isOpen={true}
				noteType={mockNoteType}
				onClose={onClose}
				onNoteTypeUpdated={onNoteTypeUpdated}
			/>,
		);

		// Update fields
		const nameInput = screen.getByLabelText("Name");
		await user.clear(nameInput);
		await user.type(nameInput, "Updated Basic");
		await user.click(screen.getByLabelText("Create reversed cards"));

		// Save
		await user.click(screen.getByRole("button", { name: "Save Changes" }));

		await waitFor(() => {
			expect(mockFetch).toHaveBeenCalledWith("/api/note-types/note-type-123", {
				method: "PUT",
				headers: {
					"Content-Type": "application/json",
					Authorization: "Bearer access-token",
				},
				body: JSON.stringify({
					name: "Updated Basic",
					frontTemplate: "{{Front}}",
					backTemplate: "{{Back}}",
					isReversible: true,
				}),
			});
		});

		expect(onNoteTypeUpdated).toHaveBeenCalledTimes(1);
		expect(onClose).toHaveBeenCalledTimes(1);
	});

	it("trims whitespace from text fields", async () => {
		const user = userEvent.setup();

		mockFetch.mockResolvedValue({
			ok: true,
			json: async () => ({ noteType: mockNoteType }),
		});

		render(<EditNoteTypeModal {...defaultProps} />);

		const nameInput = screen.getByLabelText("Name");
		await user.clear(nameInput);
		await user.type(nameInput, "  Updated Basic  ");
		await user.click(screen.getByRole("button", { name: "Save Changes" }));

		await waitFor(() => {
			expect(mockFetch).toHaveBeenCalledWith(
				"/api/note-types/note-type-123",
				expect.objectContaining({
					body: expect.stringContaining('"name":"Updated Basic"'),
				}),
			);
		});
	});

	it("shows loading state during submission", async () => {
		const user = userEvent.setup();

		mockFetch.mockImplementation(() => new Promise(() => {})); // Never resolves

		render(<EditNoteTypeModal {...defaultProps} />);

		await user.click(screen.getByRole("button", { name: "Save Changes" }));

		expect(screen.getByRole("button", { name: "Saving..." })).toBeDefined();
		expect(screen.getByRole("button", { name: "Saving..." })).toHaveProperty(
			"disabled",
			true,
		);
		expect(screen.getByRole("button", { name: "Cancel" })).toHaveProperty(
			"disabled",
			true,
		);
		expect(screen.getByLabelText("Name")).toHaveProperty("disabled", true);
	});

	it("displays API error message", async () => {
		const user = userEvent.setup();

		mockFetch.mockResolvedValue({
			ok: false,
			status: 404,
			json: async () => ({ error: "Note type not found" }),
		});

		render(<EditNoteTypeModal {...defaultProps} />);

		await user.click(screen.getByRole("button", { name: "Save Changes" }));

		await waitFor(() => {
			expect(screen.getByRole("alert").textContent).toContain(
				"Note type not found",
			);
		});
	});

	it("displays generic error on unexpected failure", async () => {
		const user = userEvent.setup();

		mockFetch.mockRejectedValue(new Error("Network error"));

		render(<EditNoteTypeModal {...defaultProps} />);

		await user.click(screen.getByRole("button", { name: "Save Changes" }));

		await waitFor(() => {
			expect(screen.getByRole("alert").textContent).toContain(
				"Failed to update note type. Please try again.",
			);
		});
	});

	it("displays error when not authenticated", async () => {
		const user = userEvent.setup();

		vi.mocked(apiClient.getAuthHeader).mockReturnValue(undefined);

		render(<EditNoteTypeModal {...defaultProps} />);

		await user.click(screen.getByRole("button", { name: "Save Changes" }));

		await waitFor(() => {
			expect(screen.getByRole("alert").textContent).toContain(
				"Not authenticated",
			);
		});
	});

	it("updates form when noteType prop changes", () => {
		const { rerender } = render(<EditNoteTypeModal {...defaultProps} />);

		expect(screen.getByLabelText("Name")).toHaveProperty("value", "Basic");

		const newNoteType = {
			id: "note-type-456",
			name: "Another Note Type",
			frontTemplate: "Q: {{Front}}",
			backTemplate: "A: {{Back}}",
			isReversible: true,
		};

		rerender(<EditNoteTypeModal {...defaultProps} noteType={newNoteType} />);

		expect(screen.getByLabelText("Name")).toHaveProperty(
			"value",
			"Another Note Type",
		);
		expect(screen.getByLabelText("Front Template")).toHaveProperty(
			"value",
			"Q: {{Front}}",
		);
		expect(screen.getByLabelText("Back Template")).toHaveProperty(
			"value",
			"A: {{Back}}",
		);
		expect(screen.getByLabelText("Create reversed cards")).toHaveProperty(
			"checked",
			true,
		);
	});

	it("clears error when modal is closed", async () => {
		const user = userEvent.setup();
		const onClose = vi.fn();

		mockFetch.mockResolvedValue({
			ok: false,
			status: 404,
			json: async () => ({ error: "Some error" }),
		});

		const { rerender } = render(
			<EditNoteTypeModal {...defaultProps} onClose={onClose} />,
		);

		// Trigger error
		await user.click(screen.getByRole("button", { name: "Save Changes" }));
		await waitFor(() => {
			expect(screen.getByRole("alert")).toBeDefined();
		});

		// Close and reopen the modal
		await user.click(screen.getByRole("button", { name: "Cancel" }));
		rerender(<EditNoteTypeModal {...defaultProps} onClose={onClose} />);

		// Error should be cleared
		expect(screen.queryByRole("alert")).toBeNull();
	});
});