import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { fileURLToPath } from 'node:url';
import {
  WsFrameSchema,
  KNOWN_FRAME_TYPES,
  type WsFrame,
} from '../../types/ws-frames.js';
import { createBroker } from '../broker.js';

const VALID_UUID_A = '00000000-0000-0000-0000-000000000001';
const VALID_UUID_B = '00000000-0000-0000-0000-000000000002';
const VALID_UUID_C = '00000000-0000-0000-0000-000000000003';
const VALID_TIMESTAMP = '2026-05-22T14:30:00.000Z';

describe('WsFrameSchema (v1.13.11-a)', () => {
  it('accepts a well-formed chat_status frame', () => {
    const result = WsFrameSchema.safeParse({
      type: 'chat_status',
      chat_id: VALID_UUID_A,
      status: 'streaming',
      at: VALID_TIMESTAMP,
    });
    expect(result.success).toBe(true);
  });

  it('rejects an unknown frame type', () => {
    const result = WsFrameSchema.safeParse({
      type: 'cosmic_ray_strike',
      chat_id: VALID_UUID_A,
    });
    expect(result.success).toBe(false);
  });

  it('rejects a chat_status frame with invalid status enum', () => {
    // v1.12.1 dropped the legacy 'working' status. Any frame still emitting it
    // should fail validation — that's a drift catcher.
    const result = WsFrameSchema.safeParse({
      type: 'chat_status',
      chat_id: VALID_UUID_A,
      status: 'working',
      at: VALID_TIMESTAMP,
    });
    expect(result.success).toBe(false);
  });

  it('rejects a UUID field with a non-UUID string', () => {
    const result = WsFrameSchema.safeParse({
      type: 'chat_status',
      chat_id: 'not-a-uuid',
      status: 'idle',
      at: VALID_TIMESTAMP,
    });
    expect(result.success).toBe(false);
  });

  it('rejects negative token counts in usage frame', () => {
    const result = WsFrameSchema.safeParse({
      type: 'usage',
      message_id: VALID_UUID_A,
      chat_id: VALID_UUID_B,
      completion_tokens: -1,
      ctx_used: 100,
      ctx_max: 1000,
    });
    expect(result.success).toBe(false);
  });

  it('accepts a usage frame with nullable token counts (pre-v1.13.7 history)', () => {
    const result = WsFrameSchema.safeParse({
      type: 'usage',
      message_id: VALID_UUID_A,
      chat_id: VALID_UUID_B,
      completion_tokens: null,
      ctx_used: null,
      ctx_max: null,
    });
    expect(result.success).toBe(true);
  });

  it('accepts a tool_result frame with non-UUID tool_call_id (model-emitted)', () => {
    // Model-emitted tool_call_ids look like "call_abc123", not UUIDs.
    const result = WsFrameSchema.safeParse({
      type: 'tool_result',
      tool_message_id: VALID_UUID_A,
      chat_id: VALID_UUID_B,
      tool_call_id: 'call_abc123',
      output: { whatever: true },
      truncated: false,
    });
    expect(result.success).toBe(true);
  });

  it('accepts a compacted frame', () => {
    const result = WsFrameSchema.safeParse({
      type: 'compacted',
      session_id: VALID_UUID_A,
      chat_id: VALID_UUID_B,
      summary_message_id: VALID_UUID_C,
    });
    expect(result.success).toBe(true);
  });

  it('accepts a session_workspace_updated frame', () => {
    const result = WsFrameSchema.safeParse({
      type: 'session_workspace_updated',
      session_id: VALID_UUID_A,
      workspace_panes: [{ id: 'p1', kind: 'chat', chatIds: [], activeChatIdx: 0 }],
    });
    expect(result.success).toBe(true);
  });

  it('every KNOWN_FRAME_TYPES entry has a discriminated branch', () => {
    // Probe each known type by attempting a minimal valid construction.
    // Failure here means the union and the KNOWN_FRAME_TYPES list drifted.
    for (const type of KNOWN_FRAME_TYPES) {
      const probe = WsFrameSchema.safeParse({ type, __dummy__: true });
      // We expect FAILURE on every type because we're missing required fields,
      // but the failure must be ABOUT the missing fields, not about an unknown
      // type. A "Invalid discriminator value" error means the type isn't in
      // the union — that's a drift.
      if (probe.success) continue;
      const issues = probe.error.issues;
      const hasInvalidDiscriminator = issues.some(
        (i) => i.code === 'invalid_union_discriminator',
      );
      expect(hasInvalidDiscriminator, `frame type '${type}' is missing from the discriminated union`).toBe(false);
    }
  });
});

describe('ws-frames.ts file mirror parity', () => {
  it('apps/server and apps/web copies are byte-identical', () => {
    const here = fileURLToPath(import.meta.url);
    const serverPath = resolve(here, '../../../types/ws-frames.ts');
    const webPath = resolve(here, '../../../../../web/src/api/ws-frames.ts');
    const serverContent = readFileSync(serverPath, 'utf8');
    const webContent = readFileSync(webPath, 'utf8');
    expect(webContent, 'apps/web/src/api/ws-frames.ts must be byte-identical to apps/server/src/types/ws-frames.ts').toBe(serverContent);
  });
});

describe('broker.publishFrame / publishUserFrame fail-closed behavior', () => {
  let logErrors: Array<{ obj: unknown; msg: string }>;
  let mockLog: Parameters<typeof createBroker>[0];

  beforeEach(() => {
    logErrors = [];
    mockLog = {
      error: (obj: unknown, msg: string) => {
        logErrors.push({ obj, msg });
      },
      info: () => {},
      warn: () => {},
      debug: () => {},
      trace: () => {},
      fatal: () => {},
      child: () => mockLog as never,
      level: 'info',
      silent: () => {},
    } as unknown as Parameters<typeof createBroker>[0];
  });

  afterEach(() => {
    vi.restoreAllMocks();
  });

  it('publishFrame delivers a valid frame to subscribers', () => {
    const broker = createBroker(mockLog);
    const received: WsFrame[] = [];
    broker.subscribe('sess-1', (f) => received.push(f as WsFrame));
    broker.publishFrame('sess-1', {
      type: 'delta',
      message_id: VALID_UUID_A,
      chat_id: VALID_UUID_B,
      content: 'hello',
    });
    expect(received).toHaveLength(1);
    expect((received[0] as { type: string }).type).toBe('delta');
    expect(logErrors).toHaveLength(0);
  });

  it('publishFrame drops + logs an invalid frame instead of delivering it', () => {
    const broker = createBroker(mockLog);
    const received: WsFrame[] = [];
    broker.subscribe('sess-1', (f) => received.push(f as WsFrame));
    broker.publishFrame('sess-1', {
      type: 'delta',
      message_id: 'not-a-uuid',
      content: 'hello',
    } as never);
    expect(received).toHaveLength(0);
    expect(logErrors).toHaveLength(1);
    expect(logErrors[0]!.msg).toMatch(/ws-frame-validation-failed/);
  });

  it('publishUserFrame drops + logs an invalid user-channel frame', () => {
    const broker = createBroker(mockLog);
    const received: WsFrame[] = [];
    broker.subscribeUser('default', (f) => received.push(f as WsFrame));
    broker.publishUserFrame('default', {
      type: 'chat_status',
      chat_id: VALID_UUID_A,
      status: 'working', // v1.12.1 dropped this enum value
      at: VALID_TIMESTAMP,
    } as never);
    expect(received).toHaveLength(0);
    expect(logErrors).toHaveLength(1);
  });

  it('publishFrame validation failure does not throw (no cascade into stream-phase)', () => {
    const broker = createBroker(mockLog);
    expect(() =>
      broker.publishFrame('sess-1', { type: 'unknown_type' } as never),
    ).not.toThrow();
  });
});