/**
 * errorAutoFix.test.ts — Unit test S32
 *
 * Copre:
 *  - startErrorAutoFix: avvia il timer (isAutoFixRunning = true)
 *  - startErrorAutoFix: idempotente (chiamate multiple non duplicano)
 *  - stopErrorAutoFix: ferma il timer (isAutoFixRunning = false)
 *  - _tick: no backend URL → skip silenzioso
 *  - _tick: errori < THRESHOLD → nessun debugLoop.run
 *  - _tick: errori ≥ THRESHOLD, lang=typescript → debugLoop.run chiamato
 *  - _tick: debugLoop.run success → errorLog.markFixed chiamato
 *  - _tick: debugLoop.run failure → markFixed non chiamato
 *  - _tick: cooldown attivo → debugLoop.run non chiamato una seconda volta
 *  - _tick: già in running → skip (no doppia esecuzione)
 *  - _tick: debugLoop lancia → non crasha (non-fatal)
 *  - clearCooldowns: svuota cooldown map
 */

import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import {
  startErrorAutoFix,
  stopErrorAutoFix,
  isAutoFixRunning,
  clearCooldowns,
  _setTestDeps,
  _resetDeps,
  _tickForTest,
} from "@/lib/errorAutoFix";
import type { ErrorEntry } from "@/lib/agentBrain";

// ─── Helper ───────────────────────────────────────────────────────────────────

function makeEntry(overrides: Partial<ErrorEntry> = {}): ErrorEntry {
  return {
    hash:      "h1",
    message:   "SyntaxError: Unexpected token",
    context:   "tool:run_code",
    fix:       undefined,
    count:     3,
    firstSeen: 1000,
    lastSeen:  Date.now(),
    lang:      "typescript",
    resolved:  false,
    ...overrides,
  };
}

function makeMockDebugLoop(success = true, times = 1) {
  return {
    run: vi.fn().mockResolvedValue({
      success,
      finalCode: success ? "const x = 1;" : "",
      attempts: times,
    }),
  };
}

// ─── Setup / Teardown ─────────────────────────────────────────────────────────

beforeEach(() => {
  stopErrorAutoFix();
  clearCooldowns();
  _resetDeps();
  // Resetta ENV mock
  vi.unstubAllEnvs();
});

afterEach(() => {
  stopErrorAutoFix();
  clearCooldowns();
  _resetDeps();
});

// ─── startErrorAutoFix / stopErrorAutoFix ─────────────────────────────────────

describe("startErrorAutoFix / stopErrorAutoFix", () => {
  it("startErrorAutoFix avvia il loop (isAutoFixRunning = true)", () => {
    startErrorAutoFix(60_000);
    expect(isAutoFixRunning()).toBe(true);
    stopErrorAutoFix();
  });

  it("stopErrorAutoFix ferma il loop (isAutoFixRunning = false)", () => {
    startErrorAutoFix(60_000);
    stopErrorAutoFix();
    expect(isAutoFixRunning()).toBe(false);
  });

  it("startErrorAutoFix è idempotente: doppia chiamata non duplica", () => {
    startErrorAutoFix(60_000);
    startErrorAutoFix(60_000); // seconda chiamata: ignorata
    expect(isAutoFixRunning()).toBe(true);
    stopErrorAutoFix();
    expect(isAutoFixRunning()).toBe(false);
  });
});

// ─── _tick: condizioni di skip ────────────────────────────────────────────────

describe("_tick: condizioni di skip", () => {
  it("nessun BACKEND_URL → skip silenzioso, debugLoop non chiamato", async () => {
    const mockLog = { unresolved: vi.fn().mockReturnValue([makeEntry(), makeEntry(), makeEntry()]), markFixed: vi.fn() };
    const mockLoop = makeMockDebugLoop();
    _setTestDeps({ errorLog: mockLog, debugLoop: mockLoop });

    // ENV.BACKEND_URL è vuoto per default in test
    await _tickForTest();

    expect(mockLoop.run).not.toHaveBeenCalled();
  });

  it("errori < THRESHOLD (3) → nessun debugLoop.run", async () => {
    const mockLog = {
      unresolved: vi.fn().mockReturnValue([makeEntry(), makeEntry()]), // solo 2
      markFixed: vi.fn(),
    };
    const mockLoop = makeMockDebugLoop();
    _setTestDeps({ errorLog: mockLog, debugLoop: mockLoop });

    await _tickForTest();

    expect(mockLoop.run).not.toHaveBeenCalled();
  });

  it("nessun errore → nessun debugLoop.run", async () => {
    const mockLog = { unresolved: vi.fn().mockReturnValue([]), markFixed: vi.fn() };
    const mockLoop = makeMockDebugLoop();
    _setTestDeps({ errorLog: mockLog, debugLoop: mockLoop });

    await _tickForTest();

    expect(mockLoop.run).not.toHaveBeenCalled();
  });
});

// ─── _tick: auto-fix attivo ───────────────────────────────────────────────────

describe("_tick: auto-fix con backend", () => {
  beforeEach(() => {
    // Stub BACKEND_URL tramite ENV mock nel modulo
    // Non possiamo stubare import.meta.env direttamente, usiamo _setTestDeps
    // con debugLoop già iniettato (così il modulo non tenta import lazy)
  });

  it("≥3 errori typescript + debugLoop iniettato + success → markFixed chiamato", async () => {
    const entries = [makeEntry({ hash: "h1" }), makeEntry({ hash: "h1" }), makeEntry({ hash: "h1" })];
    const mockLog = { unresolved: vi.fn().mockReturnValue(entries), markFixed: vi.fn().mockReturnValue(true) };
    const mockLoop = makeMockDebugLoop(true, 1);

    // Inietta debugLoop direttamente E simula BACKEND_URL settato
    _setTestDeps({ errorLog: mockLog, debugLoop: mockLoop });

    // Modifichiamo ENV tramite patch sull'oggetto importato
    const envModule = await import("@/config/env");
    const origUrl = envModule.ENV.BACKEND_URL;
    (envModule.ENV as Record<string, unknown>).BACKEND_URL = "https://backend.example.com";

    await _tickForTest();

    (envModule.ENV as Record<string, unknown>).BACKEND_URL = origUrl;

    expect(mockLoop.run).toHaveBeenCalledTimes(1);
    expect(mockLog.markFixed).toHaveBeenCalledTimes(1);
    const [hash, fixNote] = mockLoop.run.mock.calls.length > 0
      ? [mockLog.markFixed.mock.calls[0][0], mockLog.markFixed.mock.calls[0][1]]
      : ["", ""];
    expect(hash).toBe("h1");
    expect(fixNote).toContain("Auto-fix");
  });

  it("debugLoop failure → markFixed non chiamato", async () => {
    const entries = [makeEntry({ hash: "h2" }), makeEntry({ hash: "h2" }), makeEntry({ hash: "h2" })];
    const mockLog = { unresolved: vi.fn().mockReturnValue(entries), markFixed: vi.fn() };
    const mockLoop = makeMockDebugLoop(false);
    _setTestDeps({ errorLog: mockLog, debugLoop: mockLoop });

    const envModule = await import("@/config/env");
    const origUrl = envModule.ENV.BACKEND_URL;
    (envModule.ENV as Record<string, unknown>).BACKEND_URL = "https://backend.example.com";

    await _tickForTest();

    (envModule.ENV as Record<string, unknown>).BACKEND_URL = origUrl;

    expect(mockLoop.run).toHaveBeenCalledTimes(1);
    expect(mockLog.markFixed).not.toHaveBeenCalled();
  });

  it("cooldown attivo → secondo tick non chiama debugLoop", async () => {
    clearCooldowns();
    const entries = [makeEntry({ hash: "h3" }), makeEntry({ hash: "h3" }), makeEntry({ hash: "h3" })];
    const mockLog = { unresolved: vi.fn().mockReturnValue(entries), markFixed: vi.fn() };
    const mockLoop = makeMockDebugLoop(true);
    _setTestDeps({ errorLog: mockLog, debugLoop: mockLoop });

    const envModule = await import("@/config/env");
    const origUrl = envModule.ENV.BACKEND_URL;
    (envModule.ENV as Record<string, unknown>).BACKEND_URL = "https://backend.example.com";

    await _tickForTest(); // prima esecuzione → cooldown impostato
    await _tickForTest(); // seconda esecuzione → h3 in cooldown

    (envModule.ENV as Record<string, unknown>).BACKEND_URL = origUrl;

    // debugLoop chiamato solo una volta
    expect(mockLoop.run).toHaveBeenCalledTimes(1);
  });

  it("debugLoop lancia → non crasha (non-fatal)", async () => {
    const entries = [makeEntry({ hash: "h4" }), makeEntry({ hash: "h4" }), makeEntry({ hash: "h4" })];
    const mockLog = { unresolved: vi.fn().mockReturnValue(entries), markFixed: vi.fn() };
    const mockLoop = { run: vi.fn().mockRejectedValue(new Error("Network timeout")) };
    _setTestDeps({ errorLog: mockLog, debugLoop: mockLoop });

    const envModule = await import("@/config/env");
    const origUrl = envModule.ENV.BACKEND_URL;
    (envModule.ENV as Record<string, unknown>).BACKEND_URL = "https://backend.example.com";

    await expect(_tickForTest()).resolves.not.toThrow();

    (envModule.ENV as Record<string, unknown>).BACKEND_URL = origUrl;
  });
});

// ─── clearCooldowns ───────────────────────────────────────────────────────────

describe("clearCooldowns", () => {
  it("clearCooldowns permette di ritentare dopo cooldown", async () => {
    const entries = [makeEntry({ hash: "h5" }), makeEntry({ hash: "h5" }), makeEntry({ hash: "h5" })];
    const mockLog = { unresolved: vi.fn().mockReturnValue(entries), markFixed: vi.fn() };
    const mockLoop = makeMockDebugLoop(true);
    _setTestDeps({ errorLog: mockLog, debugLoop: mockLoop });

    const envModule = await import("@/config/env");
    const origUrl = envModule.ENV.BACKEND_URL;
    (envModule.ENV as Record<string, unknown>).BACKEND_URL = "https://backend.example.com";

    await _tickForTest(); // imposta cooldown
    clearCooldowns();     // resetta
    await _tickForTest(); // ora può ritentare

    (envModule.ENV as Record<string, unknown>).BACKEND_URL = origUrl;

    expect(mockLoop.run).toHaveBeenCalledTimes(2);
  });
});