import { render, screen, waitFor } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import { beforeEach, describe, expect, it, vi } from "vitest";

import SeatAllocationDialog from "./SeatAllocationDialog";
import SeatSummaryStrip from "./SeatSummaryStrip";


const setSeats = vi.fn();

vi.mock("./OrgApi", () => ({
    orgApi: {
        setSeats: (id: string, limit: number | null) => setSeats(id, limit),
    },
}));

vi.mock("react-i18next", () => ({
    useTranslation: () => ({
        t: (key: string, options?: Record<string, unknown>) =>
            options && Object.keys(options).length
                ? `${key}:${JSON.stringify(options)}`
                : key,
        i18n: { language: "en" },
    }),
}));

const unit = (overrides: Record<string, unknown> = {}) => ({
    id: "u1",
    name: "Lahore",
    code: null,
    parent_id: null,
    path: "/u1/",
    depth: 0,
    is_active: true,
    seat_limit: null as number | null,
    seats_used: 2,
    ...overrides,
});

beforeEach(() => {
    setSeats.mockReset().mockResolvedValue({
        purchased: 50,
        allocated: 10,
        unallocated: 40,
    });
});

describe("SeatAllocationDialog", () => {
    it("sends null when the box is cleared, not zero", async () => {
        const user = userEvent.setup({ delay: null });
        render(
            <SeatAllocationDialog
                unit={unit({ seat_limit: 8 })}
                availableToThisUnit={40}
                onClose={vi.fn()}
                onSaved={vi.fn()}
            />
        );

        await user.clear(screen.getByRole("spinbutton"));
        await user.click(screen.getByRole("button", { name: /actions\.save/ }));

        await waitFor(() => expect(setSeats).toHaveBeenCalledWith("u1", null));
    });

    it("sends zero when zero is typed", async () => {
        const user = userEvent.setup({ delay: null });
        render(
            <SeatAllocationDialog
                unit={unit({ seat_limit: 8 })}
                availableToThisUnit={40}
                onClose={vi.fn()}
                onSaved={vi.fn()}
            />
        );

        const field = screen.getByRole("spinbutton");
        await user.clear(field);
        await user.type(field, "0");
        await user.click(screen.getByRole("button", { name: /actions\.save/ }));

        await waitFor(() => expect(setSeats).toHaveBeenCalledWith("u1", 0));
    });

    it("opens showing the branch's own limit rather than the last one edited", async () => {
        const { rerender } = render(
            <SeatAllocationDialog
                unit={unit({ id: "u1", seat_limit: 8 })}
                availableToThisUnit={40}
                onClose={vi.fn()}
                onSaved={vi.fn()}
            />
        );
        expect(screen.getByRole("spinbutton")).toHaveValue(8);

        rerender(
            <SeatAllocationDialog
                unit={unit({ id: "u2", name: "Karachi", seat_limit: 3 })}
                availableToThisUnit={40}
                onClose={vi.fn()}
                onSaved={vi.fn()}
            />
        );
        await waitFor(() => expect(screen.getByRole("spinbutton")).toHaveValue(3));
    });

    it("opens empty for a branch that has no cap", async () => {
        render(
            <SeatAllocationDialog
                unit={unit({ seat_limit: null })}
                availableToThisUnit={40}
                onClose={vi.fn()}
                onSaved={vi.fn()}
            />
        );
        expect(screen.getByRole("spinbutton")).toHaveValue(null);
    });

    it("shows the server's refusal rather than a generic message", async () => {
        setSeats.mockRejectedValue(new Error("At most 2 can go to Lahore."));

        const user = userEvent.setup({ delay: null });
        const onSaved = vi.fn();
        render(
            <SeatAllocationDialog
                unit={unit({ seat_limit: 1 })}
                availableToThisUnit={2}
                onClose={vi.fn()}
                onSaved={onSaved}
            />
        );

        const field = screen.getByRole("spinbutton");
        await user.clear(field);
        await user.type(field, "9");
        await user.click(screen.getByRole("button", { name: /actions\.save/ }));

        expect(await screen.findByText("At most 2 can go to Lahore.")).toBeInTheDocument();
        expect(onSaved).not.toHaveBeenCalled();
    });

    it("stays open when the save fails", async () => {
        setSeats.mockRejectedValue(new Error("nope"));

        const user = userEvent.setup({ delay: null });
        const onClose = vi.fn();
        render(
            <SeatAllocationDialog
                unit={unit({ seat_limit: 1 })}
                availableToThisUnit={2}
                onClose={onClose}
                onSaved={vi.fn()}
            />
        );

        await user.click(screen.getByRole("button", { name: /actions\.save/ }));

        await waitFor(() => expect(screen.getByText("nope")).toBeInTheDocument());
        expect(onClose).not.toHaveBeenCalled();
    });

    it("renders nothing when no unit is open", () => {
        const { container } = render(
            <SeatAllocationDialog
                unit={null}
                availableToThisUnit={40}
                onClose={vi.fn()}
                onSaved={vi.fn()}
            />
        );
        expect(container).toBeEmptyDOMElement();
    });
});

describe("SeatSummaryStrip", () => {
    it("shows what is left to give", async () => {
        render(<SeatSummaryStrip summary={{ purchased: 50, allocated: 12, unallocated: 38 }} />);

        expect(screen.getByText("50")).toBeInTheDocument();
        expect(screen.getByText("12")).toBeInTheDocument();
        expect(screen.getByText("38")).toBeInTheDocument();
    });

    it("does not invent a remainder out of an unlimited plan", () => {
        render(<SeatSummaryStrip summary={{ purchased: null, allocated: 12, unallocated: null }} />);

        expect(screen.getByText("seats.unlimited")).toBeInTheDocument();
        expect(screen.queryByText("seats.unallocated")).not.toBeInTheDocument();
    });

    it("shows nothing rather than zeroes when the position is unknown", () => {
        const { container } = render(<SeatSummaryStrip summary={null} />);
        expect(container).toBeEmptyDOMElement();
    });
});