'use strict';

const { test, afterEach } = require('node:test');
const assert = require('node:assert/strict');
const { RELEASES_PER_PAGE, fetchReleases } = require('../releases');

const realFetch = globalThis.fetch;

afterEach(() => {
    globalThis.fetch = realFetch;
});

function mockResponse(items) {
    return { ok: true, text: async () => JSON.stringify(items) };
}

test('fetchReleases 逐頁讀取直到不足一頁', async () => {
    const fullPage = Array.from({ length: RELEASES_PER_PAGE }, (_, i) => ({ id: i }));
    const lastPage = [{ id: 100 }, { id: 101 }];
    const requested = [];
    globalThis.fetch = async (url) => {
        const page = Number(new URL(url).searchParams.get('page'));
        requested.push(page);
        return mockResponse(page === 1 ? fullPage : lastPage);
    };

    const releases = await fetchReleases('https://gitea.example.com/api/v1/repos/o/r/releases');

    assert.equal(releases.length, RELEASES_PER_PAGE + lastPage.length);
    assert.deepEqual(requested, [1, 2]);
});

test('fetchReleases 在空陣列頁面停止', async () => {
    globalThis.fetch = async () => mockResponse([]);
    const releases = await fetchReleases('https://gitea.example.com/api/v1/repos/o/r/releases');
    assert.deepEqual(releases, []);
});

test('fetchReleases 帶上授權標頭', async () => {
    let seenHeaders;
    globalThis.fetch = async (_url, opts) => {
        seenHeaders = opts.headers;
        return mockResponse([]);
    };

    await fetchReleases('https://gitea.example.com/api/v1/repos/o/r/releases', { token: 'secret' });
    assert.equal(seenHeaders.Authorization, 'token secret');
});

test('fetchReleases 在 HTTP 錯誤時丟出例外', async () => {
    globalThis.fetch = async () => ({ ok: false, status: 500 });
    await assert.rejects(
        () => fetchReleases('https://gitea.example.com/api/v1/repos/o/r/releases'),
        /release API 請求失敗/,
    );
});

test('fetchReleases 在回傳非陣列時丟出例外', async () => {
    globalThis.fetch = async () => mockResponse({ message: 'not an array' });
    await assert.rejects(
        () => fetchReleases('https://gitea.example.com/api/v1/repos/o/r/releases'),
        /回傳非陣列資料/,
    );
});

test('fetchReleases 在 null 回應時視為無更多資料', async () => {
    globalThis.fetch = async () => ({ ok: true, text: async () => 'null' });
    const releases = await fetchReleases('https://gitea.example.com/api/v1/repos/o/r/releases');
    assert.deepEqual(releases, []);
});