/**
 * confidenceEngine.test.ts — Unit test S39 ConfidenceEngine
 *
 * Copertura (12 test):
 *  1. score iniziale 0.5 → level=medium
 *  2. recordSignal tool_success → score aumenta
 *  3. recordSignal tool_failure → score diminuisce
 *  4. build_ok → grande aumento score
 *  5. build_fail_serious → grande calo score
 *  6. shouldEscalate: true sotto soglia 0.35
 *  7. shouldClose: true sopra soglia 0.72
 *  8. reset: ritorna a score iniziale
 *  9. summary: stringa leggibile con score e conteggi
 * 10. classifyBuildFailure: "cannot find module" → serious
 * 11. classifyBuildFailure: singolo TS error → trivial
 * 12. buildFailureSignal mappa correttamente a kind
 * 13. DI _setTestDeps: now() mock
 * 14. score clampato tra 0 e 1
 *
 * SESSIONE: S39 — TaskClassifier + ConfidenceEngine + RequestEnhancer
 */

import { describe, it, expect, beforeEach, afterEach } from "vitest";
import {
  ConfidenceSession,
  createConfidenceSession,
  classifyBuildFailure,
  buildFailureSignal,
  getThresholds,
  _setTestDeps,
  _resetDeps,
} from "@/lib/confidenceEngine";

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

// ─── ConfidenceSession ────────────────────────────────────────────────────────

describe("ConfidenceSession", () => {
  it("1. score iniziale 0.5 → level=medium", () => {
    const s = createConfidenceSession("task-1");
    expect(s.getScore()).toBeCloseTo(0.5);
    expect(s.getLevel()).toBe("medium");
  });

  it("2. tool_success → score aumenta", () => {
    const s = createConfidenceSession("task-2");
    const before = s.getScore();
    s.recordSignal("tool_success");
    expect(s.getScore()).toBeGreaterThan(before);
  });

  it("3. tool_failure → score diminuisce", () => {
    const s = createConfidenceSession("task-3");
    const before = s.getScore();
    s.recordSignal("tool_failure");
    expect(s.getScore()).toBeLessThan(before);
  });

  it("4. build_ok → aumento significativo score", () => {
    const s = createConfidenceSession("task-4", 0.4);
    s.recordSignal("build_ok");
    expect(s.getScore()).toBeGreaterThan(0.55);
  });

  it("5. build_fail_serious → calo drastico score", () => {
    const s = createConfidenceSession("task-5", 0.7);
    s.recordSignal("build_fail_serious");
    expect(s.getScore()).toBeLessThan(0.45);
  });

  it("6. shouldEscalate: true dopo segnali negativi gravi", () => {
    const s = createConfidenceSession("task-6", 0.5);
    s.recordSignal("build_fail_serious");
    s.recordSignal("llm_refusal");
    expect(s.shouldEscalate()).toBe(true);
  });

  it("7. shouldClose: true dopo segnali positivi", () => {
    const s = createConfidenceSession("task-7", 0.6);
    s.recordSignal("build_ok");
    s.recordSignal("user_confirm");
    expect(s.shouldClose()).toBe(true);
  });

  it("8. reset: ritorna allo score iniziale e svuota segnali", () => {
    const s = createConfidenceSession("task-8", 0.5);
    s.recordSignal("build_fail_serious");
    s.recordSignal("tool_failure");
    s.reset();
    expect(s.getScore()).toBeCloseTo(0.5);
    expect(s.getState().signals).toHaveLength(0);
  });

  it("9. summary: stringa che include score e conteggi segnali", () => {
    const s = createConfidenceSession("task-9");
    s.recordSignal("tool_success");
    s.recordSignal("tool_failure");
    const sum = s.summary();
    expect(sum).toContain("%");
    expect(sum).toContain("+1");
    expect(sum).toContain("-1");
  });

  it("14. score clampato tra 0 e 1 anche con molti segnali negativi", () => {
    const s = createConfidenceSession("task-14", 0.1);
    for (let i = 0; i < 10; i++) s.recordSignal("build_fail_serious");
    expect(s.getScore()).toBeGreaterThanOrEqual(0);
    expect(s.getScore()).toBeLessThanOrEqual(1);
  });

  it("14b. score clampato tra 0 e 1 anche con molti segnali positivi", () => {
    const s = createConfidenceSession("task-14b", 0.9);
    for (let i = 0; i < 10; i++) s.recordSignal("build_ok");
    expect(s.getScore()).toBeGreaterThanOrEqual(0);
    expect(s.getScore()).toBeLessThanOrEqual(1);
  });
});

// ─── classifyBuildFailure ─────────────────────────────────────────────────────

describe("classifyBuildFailure", () => {
  it("10. 'cannot find module' → serious", () => {
    expect(classifyBuildFailure("Error: Cannot find module './foo'")).toBe("serious");
  });

  it("10b. molti errori → serious", () => {
    expect(classifyBuildFailure("27 errors found in build")).toBe("serious");
  });

  it("10c. dipendenza mancante → serious", () => {
    expect(classifyBuildFailure("Failed to resolve import 'react' from 'src/main.tsx'")).toBe("serious");
  });

  it("11. singolo errore TypeScript banale → trivial", () => {
    expect(classifyBuildFailure("TS2345: Argument of type 'string' is not assignable to 'number'")).toBe("trivial");
  });

  it("11b. errore di variabile non usata → trivial", () => {
    expect(classifyBuildFailure("warning: unused variable 'foo'")).toBe("trivial");
  });
});

// ─── buildFailureSignal ───────────────────────────────────────────────────────

describe("buildFailureSignal", () => {
  it("12. errore serio → 'build_fail_serious'", () => {
    expect(buildFailureSignal("Cannot find module './auth'")).toBe("build_fail_serious");
  });

  it("12b. errore banale → 'build_fail_trivial'", () => {
    expect(buildFailureSignal("TS1005: ';' expected")).toBe("build_fail_trivial");
  });
});

// ─── DI _setTestDeps ─────────────────────────────────────────────────────────

describe("DI _setTestDeps", () => {
  it("13. now() mock è usato in recordSignal", () => {
    let t = 1000;
    _setTestDeps({ now: () => t });
    const s = createConfidenceSession("task-di");
    s.recordSignal("tool_success");
    const sig = s.getState().signals[0];
    expect(sig.at).toBe(1000);
  });
});

// ─── getThresholds ────────────────────────────────────────────────────────────

describe("getThresholds", () => {
  it("ritorna tutte le soglie operative", () => {
    const t = getThresholds();
    expect(t.high).toBeGreaterThan(t.medium);
    expect(t.medium).toBeGreaterThan(t.low);
    expect(t.escalate).toBeGreaterThan(0);
    expect(t.close).toBeGreaterThan(t.escalate);
  });
});