import { describe, expect, it, vi } from 'vitest';

import { HistoryRequestGate } from '../src/bridge/apis/history-request-gate';

describe('HistoryRequestGate', () => {
    it('enforces the stricter gap on both sides of an automatic sync request', async () => {
        let now = 0;
        const sleeps: number[] = [];
        const starts: number[] = [];
        const gate = new HistoryRequestGate({
            now: () => now,
            sleep: async (ms) => {
                sleeps.push(ms);
                now += ms;
            },
        });

        await gate.run(2_000, async () => {
            starts.push(now);
        });
        await gate.run(300, async () => {
            starts.push(now);
        });
        await gate.run(2_000, async () => {
            starts.push(now);
        });

        expect(starts).toEqual([0, 2_000, 4_000]);
        expect(sleeps).toEqual([2_000, 2_000]);
    });

    it('serializes request execution and remains usable after a rejection', async () => {
        let releaseFirst!: () => void;
        const firstBlocked = new Promise<void>((resolve) => {
            releaseFirst = resolve;
        });
        const order: string[] = [];
        const gate = new HistoryRequestGate({
            now: () => 1_000,
            sleep: async () => undefined,
        });

        const first = gate.run(300, async () => {
            order.push('first:start');
            await firstBlocked;
            order.push('first:end');
            throw new Error('first failed');
        });
        const secondFn = vi.fn(async () => {
            order.push('second');
        });
        const second = gate.run(300, secondFn);

        await Promise.resolve();
        expect(secondFn).not.toHaveBeenCalled();

        releaseFirst();
        await expect(first).rejects.toThrow('first failed');
        await second;

        expect(order).toEqual(['first:start', 'first:end', 'second']);
    });

    it('cancels a delayed request before its network operation starts', async () => {
        let now = 0;
        let sleepStarted!: () => void;
        const sleeping = new Promise<void>((resolve) => {
            sleepStarted = resolve;
        });
        const gate = new HistoryRequestGate({
            now: () => now,
            sleep: (ms, signal) => {
                sleepStarted();
                return new Promise<void>((resolve, reject) => {
                    const onAbort = () => reject(signal?.reason ?? new Error('aborted'));
                    signal?.addEventListener('abort', onAbort, { once: true });
                    void ms;
                    void resolve;
                });
            },
        });

        await gate.run(2_000, async () => undefined);
        const operation = vi.fn(async () => undefined);
        const controller = new AbortController();
        const queued = gate.run(2_000, operation, controller.signal);

        await sleeping;
        controller.abort(new Error('account disposed'));

        await expect(queued).rejects.toThrow('account disposed');
        expect(operation).not.toHaveBeenCalled();

        now = 2_000;
        await gate.run(0, async () => undefined);
        expect(operation).not.toHaveBeenCalled();
    });
});