import { describe, expect, test, vi } from 'vitest';
import { createGiteaClient } from '../src/gitea.ts';

type MockFetch = ReturnType<typeof vi.fn>;

function jsonResponse(body: unknown, status = 200): Response {
  return new Response(JSON.stringify(body), {
    status,
    headers: { 'content-type': 'application/json' },
  });
}

function makeClient(mockFetch: MockFetch) {
  return createGiteaClient({
    baseUrl: 'https://git.kzntsv.site',
    token: 'test-token',
    fetch: mockFetch as unknown as typeof fetch,
  });
}

describe('GiteaClient.getFile', () => {
  test('hits /api/v1/repos/<owner>/<repo>/contents/<path> with Authorization header', async () => {
    const mockFetch: MockFetch = vi.fn().mockResolvedValue(
      jsonResponse({
        content: Buffer.from('hello world', 'utf8').toString('base64'),
        encoding: 'base64',
      }),
    );
    const client = makeClient(mockFetch);

    await client.getFile('OpeItcLoc03', 'board-viewer', '.tasks/STATUS.md');

    expect(mockFetch).toHaveBeenCalledTimes(1);
    const [url, init] = mockFetch.mock.calls[0]!;
    expect(url).toBe(
      'https://git.kzntsv.site/api/v1/repos/OpeItcLoc03/board-viewer/contents/.tasks/STATUS.md',
    );
    expect((init as RequestInit).headers).toMatchObject({
      Authorization: 'token test-token',
    });
  });

  test('decodes base64 content and returns text', async () => {
    const original = 'STATUS.md body\nwith newline.';
    const mockFetch: MockFetch = vi.fn().mockResolvedValue(
      jsonResponse({
        content: Buffer.from(original, 'utf8').toString('base64'),
        encoding: 'base64',
      }),
    );
    const client = makeClient(mockFetch);

    const result = await client.getFile('owner', 'repo', 'file.md');

    expect(result).toBe(original);
  });

  test('returns null on 404 (file absent)', async () => {
    const mockFetch: MockFetch = vi.fn().mockResolvedValue(
      new Response('Not Found', { status: 404 }),
    );
    const client = makeClient(mockFetch);

    const result = await client.getFile('owner', 'repo', 'missing.md');

    expect(result).toBeNull();
  });

  test('throws on non-404 HTTP error (e.g. 500)', async () => {
    const mockFetch: MockFetch = vi.fn().mockResolvedValue(
      new Response('Server error', { status: 500 }),
    );
    const client = makeClient(mockFetch);

    await expect(client.getFile('owner', 'repo', 'file.md')).rejects.toThrow(/500/);
  });
});

describe('GiteaClient.getLatestCommitIso', () => {
  test('returns commit date ISO string when commit exists', async () => {
    const mockFetch: MockFetch = vi.fn().mockResolvedValue(
      jsonResponse([
        { commit: { author: { date: '2026-05-22T08:10:00Z' } } },
      ]),
    );
    const client = makeClient(mockFetch);

    const iso = await client.getLatestCommitIso('owner', 'repo', '.tasks/foo.md');

    expect(iso).toBe('2026-05-22T08:10:00Z');
    const [url] = mockFetch.mock.calls[0]!;
    expect(url).toMatch(
      /\/api\/v1\/repos\/owner\/repo\/commits\?path=\.tasks%2Ffoo\.md&limit=1/,
    );
  });

  test('returns null when no commits touch the path', async () => {
    const mockFetch: MockFetch = vi.fn().mockResolvedValue(jsonResponse([]));
    const client = makeClient(mockFetch);

    expect(await client.getLatestCommitIso('o', 'r', 'p.md')).toBeNull();
  });
});

describe('GiteaClient.rawUrl', () => {
  test('builds the raw URL for a file on the default branch', () => {
    const client = makeClient(vi.fn());

    const url = client.rawUrl('OpeItcLoc03', 'board-viewer', '.tasks/STATUS.md');

    expect(url).toBe(
      'https://git.kzntsv.site/OpeItcLoc03/board-viewer/raw/branch/master/.tasks/STATUS.md',
    );
  });
});