import { vi } from 'vitest'
/**
 * Unit tests for BotDetailModal refreshTimer cleanup logic
 * Tests that setTimeout is properly cleared on component unmount (fix for issue #313)
 */

describe('BotDetailModal refreshTimer cleanup', () => {
    beforeEach(() => {
        vi.useFakeTimers();
    });

    afterEach(() => {
        vi.useRealTimers();
    });

    // Extracted refreshTimer cleanup logic for testing (mirrors BotDetailModal implementation)
    function createRefreshTimerManager() {
        let refreshTimer: ReturnType<typeof setTimeout> | null = null;

        return {
            getTimer: () => refreshTimer,
            scheduleRefresh: (callback: () => void, delay: number) => {
                refreshTimer = setTimeout(callback, delay);
            },
            componentWillUnmount: () => {
                if (refreshTimer) {
                    clearTimeout(refreshTimer);
                    refreshTimer = null;
                }
            },
        };
    }

    it('should have null refreshTimer initially', () => {
        const manager = createRefreshTimerManager();
        expect(manager.getTimer()).toBeNull();
    });

    it('should set refreshTimer when scheduleRefresh is called', () => {
        const manager = createRefreshTimerManager();
        const callback = vi.fn();

        manager.scheduleRefresh(callback, 500);

        expect(manager.getTimer()).not.toBeNull();
    });

    it('should execute callback after delay', () => {
        const manager = createRefreshTimerManager();
        const callback = vi.fn();

        manager.scheduleRefresh(callback, 500);

        expect(callback).not.toHaveBeenCalled();
        vi.advanceTimersByTime(500);
        expect(callback).toHaveBeenCalledTimes(1);
    });

    it('should clear refreshTimer on componentWillUnmount', () => {
        const manager = createRefreshTimerManager();
        const callback = vi.fn();

        manager.scheduleRefresh(callback, 500);
        expect(manager.getTimer()).not.toBeNull();

        manager.componentWillUnmount();

        expect(manager.getTimer()).toBeNull();
    });

    it('should prevent callback execution after unmount (memory leak prevention)', () => {
        const manager = createRefreshTimerManager();
        const callback = vi.fn();

        manager.scheduleRefresh(callback, 500);
        manager.componentWillUnmount();

        vi.advanceTimersByTime(500);

        expect(callback).not.toHaveBeenCalled();
    });

    it('should handle unmount when no timer is set', () => {
        const manager = createRefreshTimerManager();

        // Should not throw
        expect(() => manager.componentWillUnmount()).not.toThrow();
        expect(manager.getTimer()).toBeNull();
    });

    it('should prevent setState on unmounted component scenario', () => {
        const manager = createRefreshTimerManager();
        let componentMounted = true;
        const setStateMock = vi.fn(() => {
            if (!componentMounted) {
                throw new Error('Cannot call setState on unmounted component');
            }
        });

        // Simulate: user clicks "添加好友", triggering setTimeout
        manager.scheduleRefresh(() => {
            setStateMock({ loading: true });
        }, 500);

        // Simulate: user closes modal within 500ms
        componentMounted = false;
        manager.componentWillUnmount();

        // Advance timers - callback should NOT execute
        vi.advanceTimersByTime(500);

        // setStateMock should never have been called
        expect(setStateMock).not.toHaveBeenCalled();
    });
});
