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import {
	act,
	fireEvent,
	render,
	screen,
	waitFor,
} from "@testing-library/react";
import { beforeEach, describe, expect, it, vi } from "vitest";
import { App } from "./App";
import type { ClientMessage } from "./protocol";
import { dispatch, resetStore } from "./store";
import { resetTheme } from "./theme";
import { resetWorkspace } from "./workspace";
import type { OriSocket } from "./ws";

vi.mock("./api", () => ({
	listFiles: vi.fn().mockResolvedValue({ path: "/w", entries: [] }),
	readFile: vi.fn().mockResolvedValue({ path: "/w/x", content: "" }),
	writeFile: vi.fn().mockResolvedValue(undefined),
	searchFiles: vi.fn().mockResolvedValue({ root: "/w", files: [] }),
	listSkills: vi.fn().mockResolvedValue({ skills: [] }),
	rawFileUrl: (path: string) => `/api/raw?path=${encodeURIComponent(path)}`,
}));

// The real terminal drags xterm and a WebSocket along; a stub is enough here.
vi.mock("./components/TerminalPane", () => ({
	TerminalPane: () => <div data-testid="terminal-pane" />,
}));

function fakeSocket() {
	const sent: ClientMessage[] = [];
	const socket: OriSocket = {
		send: (message) => sent.push(message),
		close: () => {},
	};
	return { socket, sent };
}

describe("App", () => {
	beforeEach(() => {
		resetStore();
		resetWorkspace();
		resetTheme();
	});

	it("switches between the light and dark themes from the header", () => {
		const { socket } = fakeSocket();
		render(<App socket={socket} />);
		expect(document.documentElement.dataset.theme).toBe("light");

		fireEvent.click(
			screen.getByRole("button", { name: "Switch to dark theme" }),
		);
		expect(document.documentElement.dataset.theme).toBe("dark");

		fireEvent.click(
			screen.getByRole("button", { name: "Switch to light theme" }),
		);
		expect(document.documentElement.dataset.theme).toBe("light");
	});

	it("toggles the workspace panel and switches its tabs", async () => {
		const { socket } = fakeSocket();
		render(<App socket={socket} />);

		// The panel stays mounted (so its state survives) and hides via CSS.
		const workspace = screen.getByRole("complementary", { name: "workspace" });
		expect(workspace.className).toContain("workspace-hidden");

		fireEvent.click(screen.getByRole("button", { name: "⊞ Workspace" }));
		expect(workspace.className).not.toContain("workspace-hidden");

		fireEvent.click(screen.getByRole("button", { name: "Terminal" }));
		await waitFor(() =>
			expect(screen.getByTestId("terminal-pane")).toBeDefined(),
		);

		fireEvent.click(screen.getByRole("button", { name: "⊞ Workspace" }));
		expect(workspace.className).toContain("workspace-hidden");
	});

	it("sends a prompt typed in the composer", () => {
		const { socket, sent } = fakeSocket();
		render(<App socket={socket} />);

		fireEvent.change(screen.getByLabelText("prompt"), {
			target: { value: "hello agent" },
		});
		fireEvent.click(screen.getByRole("button", { name: "Send" }));

		expect(sent).toEqual([{ type: "prompt", text: "hello agent" }]);
	});

	it("shows the streamed conversation from the store", () => {
		const { socket } = fakeSocket();
		render(<App socket={socket} />);

		act(() => {
			dispatch({
				type: "server",
				message: { type: "user_message", text: "my question" },
			});
			dispatch({
				type: "server",
				message: {
					type: "session_update",
					update: {
						sessionUpdate: "agent_message_chunk",
						content: { type: "text", text: "my **answer**" },
					},
				},
			});
		});

		expect(screen.getByText("my question")).toBeDefined();
		expect(screen.getByText("answer")).toBeDefined(); // bold inner text
	});

	it("offers Stop instead of Send during a turn, and Stop cancels", () => {
		const { socket, sent } = fakeSocket();
		render(<App socket={socket} />);

		act(() => {
			dispatch({ type: "server", message: { type: "turn_started" } });
		});

		expect(screen.queryByRole("button", { name: "Send" })).toBeNull();
		fireEvent.click(screen.getByRole("button", { name: "Stop" }));
		expect(sent).toEqual([{ type: "cancel" }]);
	});

	it("shows the connection status and session id from hello", () => {
		const { socket } = fakeSocket();
		render(<App socket={socket} />);

		act(() => {
			dispatch({
				type: "server",
				message: { type: "hello", sessionId: "sess-42" },
			});
		});

		expect(screen.getByText(/online/)).toBeDefined();
		expect(screen.getByText(/sess-42/)).toBeDefined();
	});

	it("renders tool calls, plan and thoughts from updates", () => {
		const { socket } = fakeSocket();
		render(<App socket={socket} />);

		act(() => {
			dispatch({
				type: "server",
				message: {
					type: "session_update",
					update: {
						sessionUpdate: "tool_call",
						toolCallId: "c1",
						title: "Running tests",
						kind: "execute",
						status: "in_progress",
					},
				},
			});
			dispatch({
				type: "server",
				message: {
					type: "session_update",
					update: {
						sessionUpdate: "plan",
						entries: [
							{
								content: "write the fix",
								priority: "high",
								status: "in_progress",
							},
						],
					},
				},
			});
			dispatch({
				type: "server",
				message: {
					type: "session_update",
					update: {
						sessionUpdate: "agent_thought_chunk",
						content: { type: "text", text: "let me think" },
					},
				},
			});
		});

		expect(screen.getByText("Running tests")).toBeDefined();
		expect(screen.getByText(/write the fix/)).toBeDefined();
		expect(screen.getByText("let me think")).toBeDefined();
	});

	it("answers a permission request through the socket", () => {
		const { socket, sent } = fakeSocket();
		render(<App socket={socket} />);

		act(() => {
			dispatch({
				type: "server",
				message: {
					type: "permission_request",
					requestId: "perm-9",
					request: {
						toolCall: { title: "Write main.go" },
						options: [
							{
								optionId: "allow-once",
								name: "Allow once",
								kind: "allow_once",
							},
							{ optionId: "reject-once", name: "Reject", kind: "reject_once" },
						],
					},
				},
			});
		});

		expect(screen.getByText(/Write main\.go/)).toBeDefined();
		fireEvent.click(screen.getByRole("button", { name: "Allow once" }));

		expect(sent).toEqual([
			{
				type: "permission_response",
				requestId: "perm-9",
				optionId: "allow-once",
			},
		]);
	});

	it("keeps a streaming thought open and collapses it when the turn ends", () => {
		const { socket } = fakeSocket();
		const { container } = render(<App socket={socket} />);

		act(() => {
			dispatch({
				type: "server",
				message: {
					type: "session_update",
					update: {
						sessionUpdate: "agent_thought_chunk",
						content: { type: "text", text: "streaming thought" },
					},
				},
			});
		});

		// While streaming: the content is in a live (non-collapsible) block.
		expect(container.querySelector(".thought-live")).not.toBeNull();
		expect(screen.getByText("💭 Thinking…")).toBeDefined();
		expect(screen.getByText("streaming thought")).toBeDefined();

		act(() => {
			dispatch({
				type: "server",
				message: { type: "turn_ended", stopReason: "end_turn" },
			});
		});

		// After the turn: a collapsible details block replaces it.
		expect(container.querySelector(".thought-live")).toBeNull();
		expect(container.querySelector("details.thought")).not.toBeNull();
		expect(screen.getByText("💭 Thought for a moment")).toBeDefined();
	});

	it("shows the spinner with a working phrase during a turn", () => {
		const { socket } = fakeSocket();
		const { container } = render(<App socket={socket} />);

		act(() => {
			dispatch({ type: "server", message: { type: "turn_started" } });
		});

		expect(container.querySelector(".spinner")).not.toBeNull();

		act(() => {
			dispatch({
				type: "server",
				message: { type: "turn_ended", stopReason: "end_turn" },
			});
		});

		expect(container.querySelector(".spinner")).toBeNull();
	});

	it("does not send empty prompts", () => {
		const { socket, sent } = fakeSocket();
		render(<App socket={socket} />);

		fireEvent.change(screen.getByLabelText("prompt"), {
			target: { value: "   " },
		});
		fireEvent.keyDown(screen.getByLabelText("prompt"), { key: "Enter" });

		expect(sent).toEqual([]);
	});
});