/**
 * agentLoopS42.test.ts — Integration tests S42: CapabilityRouter + TaskClassifier wire-in
 *
 * Copertura (12 test):
 *  1. classifyTask + route: task semplice → light tier → groq (velocità)
 *  2. classifyTask + route: task premium → high reasoning → gemini o openai
 *  3. classifyTask + route: code_generation → code=true → provider con code_score alto
 *  4. classifyTask + route: search_and_report → requires_tools=true → provider con tools=true
 *  5. route: prefer_free=true → esclude provider non free se disponibili free
 *  6. _setRouterDeps: isAvailable filtra provider senza token
 *  7. _setRouterDeps: solo groq disponibile → route ritorna groq
 *  8. route con tutti i provider unavailable → null (no crash)
 *  9. classifyTask: debug → modelTier standard, code=true nel capReq
 * 10. classifyTask: full_app → premium, needsPlan=true
 * 11. preferredModel map: groq → llama-3.3-70b-versatile
 * 12. preferredModel map: gemini → gemini-2.5-flash
 *
 * DI: _setTestDeps / _resetDeps + _setTestMatcher / _resetMatcher
 * Zero vi.mock su moduli ESM — pattern DI puro
 * SESSIONE: S42 — CapabilityRouter + TaskClassifier wire-in agentLoop
 */

import { describe, it, expect, beforeEach, afterEach } from "vitest";
import {
  classifyTask,
  _setTestMatcher,
  _resetMatcher,
} from "@/lib/taskClassifier";
import {
  route,
  scoreProfile,
  CAPABILITY_PROFILES,
  _setTestDeps,
  _resetDeps,
} from "@/lib/capabilityRouter";
import type { CapabilityRequest } from "@/lib/capabilityRouter";

// ─── Helpers ──────────────────────────────────────────────────────────────────

/** Costruisce un CapabilityRequest dal TaskClassification (rispecchia la logica wire-in) */
function buildCapReq(msg: string): CapabilityRequest {
  const cls = classifyTask(msg);
  return {
    reasoning_depth: (
      cls.modelTier === "premium"  ? "high"   :
      cls.modelTier === "standard" ? "medium" : "low"
    ) as "low" | "medium" | "high",
    code:           cls.type === "code_generation" || cls.type === "code_fix" || cls.type === "refactor" || cls.type === "debug",
    requires_tools: cls.type === "search_and_report" || cls.type === "debug",
    prefer_free:    true,
    speed:          cls.complexity <= 3,
  };
}

/** Mappa provider → modello hint (rispecchia la logica wire-in) */
function mapPreferredModel(provider: string): string | undefined {
  switch (provider) {
    case "groq":       return "llama-3.3-70b-versatile";
    case "gemini":     return "gemini-2.5-flash"; // gemini-2.0-flash deprecato marzo 2026
    case "openai":     return "gpt-4o-mini";
    case "openrouter": return "moonshotai/kimi-k2.6:free"; // S306: deepseek-v4-flash non più free
    default:           return undefined;
  }
}

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

beforeEach(() => {
  _setTestDeps({ isAvailable: () => true });
});

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

// ─── Test suite ───────────────────────────────────────────────────────────────

describe("S42: TaskClassifier + CapabilityRouter integration", () => {

  it("1. task semplice → light tier → provider veloce scelto (speed=true)", () => {
    const cls = classifyTask("ciao");
    expect(cls.modelTier).toBe("light");
    expect(cls.complexity).toBeLessThanOrEqual(3);

    const req = buildCapReq("ciao");
    expect(req.speed).toBe(true);
    expect(req.reasoning_depth).toBe("low");

    const result = route(req);
    expect(result).not.toBeNull();
    // Con speed=true groq ha lo score più alto (speed_score=10)
    expect(result!.provider).toBe("groq");
  });

  it("2. task premium (full_app) → reasoning high → provider con reasoning_score>=9", () => {
    const cls = classifyTask("crea un'app completa da zero con dashboard e autenticazione");
    expect(cls.modelTier).toBe("premium");

    const req = buildCapReq("crea un'app completa da zero con dashboard e autenticazione");
    expect(req.reasoning_depth).toBe("high");

    const result = route(req);
    expect(result).not.toBeNull();
    expect(result!.profile.reasoning_score).toBeGreaterThanOrEqual(9);
    expect(["gemini", "openai"]).toContain(result!.provider);
  });

  it("3. code_generation → code=true nel capReq → provider con code_score alto", () => {
    const cls = classifyTask("scrivi una funzione TypeScript per validare email");
    expect(cls.type).toBe("code_generation");

    const req = buildCapReq("scrivi una funzione TypeScript per validare email");
    expect(req.code).toBe(true);

    const result = route(req);
    expect(result).not.toBeNull();
    // I provider con code_score alto (openai=9, gemini=8, openrouter=8) devono essere preferiti
    expect(result!.profile.code_score).toBeGreaterThanOrEqual(6);
  });

  it("4. search_and_report → requires_tools=true → provider con tools=true", () => {
    const cls = classifyTask("cerca informazioni su TypeScript 5.9");
    expect(cls.type).toBe("search_and_report");

    const req = buildCapReq("cerca informazioni su TypeScript 5.9");
    expect(req.requires_tools).toBe(true);

    const result = route(req);
    expect(result).not.toBeNull();
    // Deve scegliere un provider con tools=true
    expect(result!.profile.tools).toBe(true);
  });

  it("5. prefer_free=true → esclude provider non free se ci sono free disponibili", () => {
    // Rende disponibili solo free + together (non free)
    _setTestDeps({ isAvailable: (id) => ["gemini", "groq", "together"].includes(id) });

    const result = route({ prefer_free: true, speed: true });
    expect(result).not.toBeNull();
    // Deve preferire groq (free + speed 10/10) su together (non free)
    expect(result!.profile.free).toBe(true);
  });

  it("6. _setRouterDeps: filtra provider senza token (solo gemini disponibile)", () => {
    _setTestDeps({ isAvailable: (id) => id === "gemini" });

    const result = route({ reasoning_depth: "high" });
    expect(result).not.toBeNull();
    expect(result!.provider).toBe("gemini");
  });

  it("7. _setRouterDeps: solo groq disponibile → ritorna groq", () => {
    _setTestDeps({ isAvailable: (id) => id === "groq" });

    const result = route({ speed: true });
    expect(result).not.toBeNull();
    expect(result!.provider).toBe("groq");
  });

  it("8. tutti i provider unavailable → route ritorna null (no crash)", () => {
    _setTestDeps({ isAvailable: () => false });

    const result = route({ reasoning_depth: "high" });
    expect(result).toBeNull();
  });

  it("9. debug task → modelTier standard, code=true, requires_tools=true nel capReq", () => {
    // "non funziona" matcha il pattern debug
    const msg = "la funzione non funziona e restituisce undefined";
    const cls = classifyTask(msg);
    expect(cls.type).toBe("debug");
    expect(cls.modelTier).toBe("standard");

    const req = buildCapReq(msg);
    expect(req.code).toBe(true);
    expect(req.requires_tools).toBe(true);
    expect(req.reasoning_depth).toBe("medium");
  });

  it("10. full_app → premium, needsPlan=true, multiFile=true", () => {
    const cls = classifyTask("build a complete app from scratch with auth and dashboard");
    expect(cls.modelTier).toBe("premium");
    expect(cls.needsPlan).toBe(true);
    expect(cls.multiFile).toBe(true);
  });

  it("11. mapPreferredModel: groq → llama-3.3-70b-versatile", () => {
    expect(mapPreferredModel("groq")).toBe("llama-3.3-70b-versatile");
  });

  it("12. mapPreferredModel: gemini → gemini-2.5-flash, openai → gpt-4o-mini, sconosciuto → undefined", () => {
    expect(mapPreferredModel("gemini")).toBe("gemini-2.5-flash");
    expect(mapPreferredModel("openai")).toBe("gpt-4o-mini");
    expect(mapPreferredModel("openrouter")).toBe("moonshotai/kimi-k2.6:free"); // S306
    expect(mapPreferredModel("huggingface")).toBeUndefined();
  });

});

// ─── scoreProfile sanity checks per wire-in ──────────────────────────────────

describe("S42: scoreProfile sanity per wire-in", () => {

  it("browser-llm con requires_tools=true ha score molto negativo (bloccato dal router)", () => {
    const profile = CAPABILITY_PROFILES["browser-llm"];
    const score = scoreProfile(profile, { requires_tools: true });
    expect(score).toBeLessThan(-50);
  });

  it("gemini ha score positivo per reasoning_depth=high", () => {
    const profile = CAPABILITY_PROFILES["gemini"];
    const score = scoreProfile(profile, { reasoning_depth: "high" });
    expect(score).toBeGreaterThan(0);
  });

  it("groq ha score più alto di gemini per speed=true (speed_score 10 vs 7)", () => {
    const groqScore  = scoreProfile(CAPABILITY_PROFILES["groq"],  { speed: true });
    const geminiScore = scoreProfile(CAPABILITY_PROFILES["gemini"], { speed: true });
    expect(groqScore).toBeGreaterThan(geminiScore);
  });

});