import { describe, it, expect, beforeEach } from 'vitest';
import {
  MatrixConnector,
  buildMessageBody,
  parseSyncResponse,
  registerMatrixConnector,
  type FetchLike,
} from './matrix.js';
import { createConnector, _resetConnectorRegistry } from './registry.js';
import type { MatrixConnectorConfig } from './types.js';

const CONFIG: MatrixConnectorConfig = {
  homeserverUrl: 'https://matrix.internal/',
  userId: '@mos:internal',
  roomId: '!room:internal',
};

/** A fetch mock that returns queued responses and records calls. */
function mockFetch(responses: Array<{ ok?: boolean; status?: number; body?: unknown }>): {
  fetchImpl: FetchLike;
  calls: Array<{ url: string; method?: string; body?: string }>;
} {
  const calls: Array<{ url: string; method?: string; body?: string }> = [];
  let i = 0;
  const fetchImpl: FetchLike = async (url, init) => {
    calls.push({ url, method: init?.method, body: init?.body });
    const r = responses[Math.min(i, responses.length - 1)] ?? {};
    i += 1;
    return {
      ok: r.ok ?? true,
      status: r.status ?? 200,
      json: async () => r.body ?? {},
      text: async () => JSON.stringify(r.body ?? {}),
    };
  };
  return { fetchImpl, calls };
}

describe('buildMessageBody', () => {
  it('builds an m.text event', () => {
    expect(buildMessageBody({ text: 'hi' })).toEqual({ msgtype: 'm.text', body: 'hi' });
  });
  it('adds an m.thread relation when threadId is set', () => {
    expect(buildMessageBody({ text: 'hi', threadId: '$evt' })).toEqual({
      msgtype: 'm.text',
      body: 'hi',
      'm.relates_to': { rel_type: 'm.thread', event_id: '$evt' },
    });
  });
});

describe('parseSyncResponse', () => {
  it('extracts operator messages and skips the orchestrator’s own echoes', () => {
    const data = {
      next_batch: 's2',
      rooms: {
        join: {
          '!room:internal': {
            timeline: {
              events: [
                {
                  type: 'm.room.message',
                  sender: '@jason:internal',
                  origin_server_ts: 1_700_000_000_000,
                  content: { body: 'status?' },
                },
                {
                  type: 'm.room.message',
                  sender: '@mos:internal', // self — skipped
                  origin_server_ts: 1_700_000_001_000,
                  content: { body: 'working on it' },
                },
                { type: 'm.reaction', sender: '@jason:internal', content: {} }, // non-message
              ],
            },
          },
        },
      },
    };
    const msgs = parseSyncResponse(data, '!room:internal', '@mos:internal');
    expect(msgs).toHaveLength(1);
    expect(msgs[0]).toMatchObject({ text: 'status?', sender: '@jason:internal' });
    expect(msgs[0]!.ts).toBe(new Date(1_700_000_000_000).toISOString());
  });

  it('carries threadId through thread-relments', () => {
    const data = {
      rooms: {
        join: {
          '!room:internal': {
            timeline: {
              events: [
                {
                  type: 'm.room.message',
                  sender: '@jason:internal',
                  origin_server_ts: 1,
                  content: {
                    body: 'in thread',
                    'm.relates_to': { rel_type: 'm.thread', event_id: '$root' },
                  },
                },
              ],
            },
          },
        },
      },
    };
    expect(parseSyncResponse(data, '!room:internal', '@mos:internal')[0]!.threadId).toBe('$root');
  });

  it('returns [] for an empty/foreign sync', () => {
    expect(parseSyncResponse({}, '!room:internal', '@mos:internal')).toEqual([]);
  });
});

describe('MatrixConnector', () => {
  it('throws without an access token', () => {
    expect(() => new MatrixConnector(CONFIG, { accessToken: '' })).toThrow(/access token/i);
  });

  it('send PUTs an m.text event and returns the event id', async () => {
    const { fetchImpl, calls } = mockFetch([{ body: { event_id: '$abc' } }]);
    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
    const res = await c.send({ text: 'pong' }, 1234);
    expect(res).toEqual({ delivered: true, messageId: '$abc' });
    expect(calls[0]!.method).toBe('PUT');
    expect(calls[0]!.url).toContain(
      '/_matrix/client/v3/rooms/!room%3Ainternal/send/m.room.message/mosaic-1234-1',
    );
    expect(JSON.parse(calls[0]!.body!)).toEqual({ msgtype: 'm.text', body: 'pong' });
  });

  it('send reports not-delivered on a non-2xx', async () => {
    const { fetchImpl } = mockFetch([{ ok: false, status: 403 }]);
    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
    const res = await c.send({ text: 'x' });
    expect(res.delivered).toBe(false);
    expect(res.error).toContain('403');
  });

  it('health reports reachable + authenticated when whoami matches', async () => {
    const { fetchImpl } = mockFetch([
      { body: { versions: ['v1.11'] } }, // /versions
      { body: { user_id: '@mos:internal' } }, // /whoami
    ]);
    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
    const h = await c.health();
    expect(h.reachable).toBe(true);
    expect(h.authenticated).toBe(true);
  });

  it('health flags auth mismatch', async () => {
    const { fetchImpl } = mockFetch([
      { body: {} },
      { body: { user_id: '@someone-else:internal' } },
    ]);
    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
    const h = await c.health();
    expect(h.reachable).toBe(true);
    expect(h.authenticated).toBe(false);
  });

  it('health reports unreachable when /versions fails', async () => {
    const { fetchImpl } = mockFetch([{ ok: false, status: 502 }]);
    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
    const h = await c.health();
    expect(h.reachable).toBe(false);
  });
});

describe('registerMatrixConnector', () => {
  beforeEach(() => _resetConnectorRegistry());

  it('registers a matrix factory createConnector can build', () => {
    registerMatrixConnector({ MATRIX_ACCESS_TOKEN: 'tok' } as NodeJS.ProcessEnv);
    const c = createConnector({ kind: 'matrix', matrix: CONFIG });
    expect(c.kind).toBe('matrix');
  });

  it('the factory rejects config missing the matrix block', () => {
    registerMatrixConnector({ MATRIX_ACCESS_TOKEN: 'tok' } as NodeJS.ProcessEnv);
    expect(() => createConnector({ kind: 'matrix' })).toThrow(/missing the .matrix. block/i);
  });
});