import { createHmac } from 'node:crypto';

import { convexTest } from 'convex-test';
import { afterAll, beforeAll, describe, expect, test } from 'vitest';

import type { Id } from '../../convex/_generated/dataModel.js';
import schema from '../../convex/schema';

const modules = import.meta.glob('../../convex/**/*.*s');

const SECRET = 'testsecret';

/** Sign a body the same way the Web Crypto verifier does (HMAC-SHA256 hex). */
const sign = (body: string): string =>
  `sha256=${createHmac('sha256', SECRET).update(body).digest('hex')}`;

const post = (
  t: ReturnType<typeof convexTest>,
  event: string,
  body: string,
  signature: string,
) =>
  t.fetch('/webhooks/github', {
    method: 'POST',
    headers: {
      'content-type': 'application/json',
      'x-github-event': event,
      'x-hub-signature-256': signature,
    },
    body,
  });

const seedConnection = async (
  t: ReturnType<typeof convexTest>,
  installationId: string,
) =>
  await t.run(async (ctx) => {
    const now = Date.now();
    const userId = await ctx.db.insert('users', { email: 'a@b.c', name: 'A' });
    return await ctx.db.insert('gitConnections', {
      userId,
      provider: 'github',
      displayName: `GitHub installation ${installationId}`,
      installationId,
      status: 'active',
      connectedAt: now,
      updatedAt: now,
    });
  });

const seedGithubSpoon = async (
  t: ReturnType<typeof convexTest>,
  forkOwner: string,
  forkRepo: string,
) =>
  (await t.run(async (ctx) => {
    const now = Date.now();
    const ownerId = await ctx.db.insert('users', {
      email: 'owner@b.c',
      name: 'Owner',
    });
    return await ctx.db.insert('spoons', {
      ownerId,
      name: `${forkOwner}/${forkRepo}`,
      provider: 'github',
      upstreamOwner: 'up',
      upstreamRepo: 'x',
      upstreamDefaultBranch: 'main',
      upstreamUrl: 'https://github.com/up/x',
      forkOwner,
      forkRepo,
      forkUrl: `https://github.com/${forkOwner}/${forkRepo}`,
      visibility: 'public',
      maintenanceMode: 'watch',
      syncCadence: 'daily',
      productionRefStrategy: 'default_branch',
      status: 'active',
      createdAt: now,
      updatedAt: now,
    });
  })) as Id<'spoons'>;

describe('POST /webhooks/github', () => {
  let previousSecret: string | undefined;

  beforeAll(() => {
    previousSecret = process.env.GITHUB_APP_WEBHOOK_SECRET;
    process.env.GITHUB_APP_WEBHOOK_SECRET = SECRET;
  });

  afterAll(() => {
    if (previousSecret === undefined) {
      delete process.env.GITHUB_APP_WEBHOOK_SECRET;
    } else {
      process.env.GITHUB_APP_WEBHOOK_SECRET = previousSecret;
    }
  });

  test('rejects a bad signature with 401 and does not process the payload', async () => {
    const t = convexTest(schema, modules);
    const connectionId = await seedConnection(t, '99');
    const body = JSON.stringify({ action: 'deleted', installation: { id: 99 } });

    const res = await post(t, 'installation', body, 'sha256=deadbeef');

    expect(res.status).toBe(401);
    // The unverified payload must NOT have flipped the connection status.
    const connection = await t.run(
      async (ctx) => await ctx.db.get(connectionId),
    );
    expect(connection?.status).toBe('active');
  });

  test('returns 503 when the webhook secret is not configured', async () => {
    const saved = process.env.GITHUB_APP_WEBHOOK_SECRET;
    delete process.env.GITHUB_APP_WEBHOOK_SECRET;
    try {
      const t = convexTest(schema, modules);
      const body = JSON.stringify({ action: 'created', installation: { id: 1 } });
      const res = await post(t, 'installation', body, sign(body));
      expect(res.status).toBe(503);
    } finally {
      process.env.GITHUB_APP_WEBHOOK_SECRET = saved;
    }
  });

  test('flips a connection to revoked on installation "deleted"', async () => {
    const t = convexTest(schema, modules);
    const connectionId = await seedConnection(t, '99');
    const body = JSON.stringify({ action: 'deleted', installation: { id: 99 } });

    const res = await post(t, 'installation', body, sign(body));

    expect(res.status).toBe(200);
    const connection = await t.run(
      async (ctx) => await ctx.db.get(connectionId),
    );
    expect(connection?.status).toBe('revoked');
  });

  test('flips a connection to active on installation "unsuspend"', async () => {
    const t = convexTest(schema, modules);
    const connectionId = await t.run(async (ctx) => {
      const now = Date.now();
      const userId = await ctx.db.insert('users', { email: 'a@b.c', name: 'A' });
      return await ctx.db.insert('gitConnections', {
        userId,
        provider: 'github',
        displayName: 'GitHub installation 77',
        installationId: '77',
        status: 'revoked',
        connectedAt: now,
        updatedAt: now,
      });
    });
    const body = JSON.stringify({ action: 'unsuspend', installation: { id: 77 } });

    const res = await post(t, 'installation', body, sign(body));

    expect(res.status).toBe(200);
    const connection = await t.run(
      async (ctx) => await ctx.db.get(connectionId),
    );
    expect(connection?.status).toBe('active');
  });

  test('accepts a valid push and returns 200', async () => {
    const t = convexTest(schema, modules);
    // Seed a spoon whose fork repo backs the pushed repository.
    await seedGithubSpoon(t, 'me', 'x-fork');
    const body = JSON.stringify({
      repository: { full_name: 'me/x-fork' },
    });

    // NOTE (convex-test limitation): the httpAction schedules
    // internal.githubSync.refreshSpoonById, which is a `'use node'` action and
    // therefore cannot execute in the convex-test VM. We assert the route
    // verified the signature, matched via findForRepo, and returned 200 without
    // throwing; we deliberately do NOT call finishInProgressScheduledFunctions
    // (the node action would fail to run under the test runtime).
    const res = await post(t, 'push', body, sign(body));

    expect(res.status).toBe(200);
  });

  test('returns 200 for a push to an unknown repo (no matches)', async () => {
    const t = convexTest(schema, modules);
    const body = JSON.stringify({
      repository: { full_name: 'nobody/nothing' },
    });

    const res = await post(t, 'push', body, sign(body));

    expect(res.status).toBe(200);
  });

  test('returns 200 for a verified but unhandled event type', async () => {
    const t = convexTest(schema, modules);
    const body = JSON.stringify({ zen: 'Keep it logically awesome.' });

    const res = await post(t, 'ping', body, sign(body));

    expect(res.status).toBe(200);
  });
});