/**
 * capabilityPolicy.test.ts — Unit test S25
 *
 * capabilityPolicy è un modulo PURO (zero imports di runtime) →
 * nessun mock necessario, tutto testabile in isolamento.
 *
 * Copertura:
 *  - checkPolicy: safe / medium / risky / dangerous / unknown
 *  - requiresConfirm: tutti i livelli di rischio
 *  - getRisk: spot checks
 *  - listPolicyRules: completezza e assenza duplicati
 *  - preview: troncatura a 200 chars
 */
import { describe, it, expect } from "vitest";
import {
  checkPolicy,
  requiresConfirm,
  getRisk,
  listPolicyRules,
} from "@/lib/capabilityPolicy";

// ─── checkPolicy ─────────────────────────────────────────────────────────────

describe("checkPolicy", () => {
  it("web_search → safe, allowed=true, preview contiene la query", () => {
    const r = checkPolicy("web_search", { query: "typescript vitest" });
    expect(r.risk).toBe("safe");
    expect(r.allowed).toBe(true);
    expect(r.preview).toContain("typescript vitest");
    expect(r.tool).toBe("web_search");
  });

  it("read_file → safe, allowed=true, preview contiene il path", () => {
    const r = checkPolicy("read_file", { path: "/src/main.ts" });
    expect(r.risk).toBe("safe");
    expect(r.allowed).toBe(true);
    expect(r.preview).toContain("/src/main.ts");
  });

  it("write_file → medium, allowed=true", () => {
    const r = checkPolicy("write_file", { path: "/out.ts", content: "x" });
    expect(r.risk).toBe("medium");
    expect(r.allowed).toBe(true);
  });

  it("pip_install → medium, allowed=true", () => {
    const r = checkPolicy("pip_install", { package: "numpy" });
    expect(r.risk).toBe("medium");
    expect(r.allowed).toBe(true);
  });

  it("github_push → risky, allowed=true (richiede confirm ma non è bloccato)", () => {
    const r = checkPolicy("github_push", { branch: "main", message: "feat: test" });
    expect(r.risk).toBe("risky");
    expect(r.allowed).toBe(true); // risky è allowed, ma requiresConfirm=true
  });

  it("exec_code_backend → risky, allowed=true", () => {
    const r = checkPolicy("exec_code_backend", { lang: "python", code: "print(1)" });
    expect(r.risk).toBe("risky");
    expect(r.allowed).toBe(true);
    expect(r.preview).toContain("python");
  });

  it("delete_file → dangerous, allowed=false (blocco automatico)", () => {
    const r = checkPolicy("delete_file", { path: "/critical.ts" });
    expect(r.risk).toBe("dangerous");
    expect(r.allowed).toBe(false); // dangerous non è mai allowed automaticamente
    expect(r.preview).toContain("/critical.ts");
  });

  it("clear_memory → dangerous, allowed=false", () => {
    const r = checkPolicy("clear_memory", {});
    expect(r.risk).toBe("dangerous");
    expect(r.allowed).toBe(false);
  });

  it("clear_all_files → dangerous, allowed=false", () => {
    const r = checkPolicy("clear_all_files", {});
    expect(r.risk).toBe("dangerous");
    expect(r.allowed).toBe(false);
  });

  it("tool sconosciuto → risky (default sicuro), allowed=true", () => {
    const r = checkPolicy("non_existent_tool_xyz", {});
    expect(r.risk).toBe("risky");
    expect(r.allowed).toBe(true);
    expect(r.label).toBe("Azione sconosciuta");
  });

  it("preview è sempre ≤200 chars anche con query lunghissima", () => {
    const longQuery = "a".repeat(500);
    const r = checkPolicy("web_search", { query: longQuery });
    expect(r.preview.length).toBeLessThanOrEqual(200);
  });

  it("checkPolicy senza args non crasha", () => {
    expect(() => checkPolicy("recall")).not.toThrow();
    expect(() => checkPolicy("delete_file")).not.toThrow();
  });

  it("safe tools: recall, search_github, get_weather, get_news", () => {
    const safeTools = ["recall", "search_github", "get_weather", "get_news", "search_wikipedia"];
    for (const tool of safeTools) {
      const r = checkPolicy(tool, {});
      expect(r.risk, `${tool} dovrebbe essere safe`).toBe("safe");
      expect(r.allowed).toBe(true);
    }
  });
});

// ─── requiresConfirm ─────────────────────────────────────────────────────────

describe("requiresConfirm", () => {
  it("tools safe → false", () => {
    expect(requiresConfirm("web_search")).toBe(false);
    expect(requiresConfirm("read_file")).toBe(false);
    expect(requiresConfirm("recall")).toBe(false);
    expect(requiresConfirm("get_weather")).toBe(false);
  });

  it("tools medium → false (no confirm, ma UI notifica)", () => {
    expect(requiresConfirm("write_file")).toBe(false);
    expect(requiresConfirm("pip_install")).toBe(false);
    expect(requiresConfirm("remember")).toBe(false);
  });

  it("tools risky → true", () => {
    expect(requiresConfirm("github_push")).toBe(true);
    expect(requiresConfirm("exec_code_backend")).toBe(true);
  });

  it("tools dangerous → true", () => {
    expect(requiresConfirm("delete_file")).toBe(true);
    expect(requiresConfirm("clear_memory")).toBe(true);
    expect(requiresConfirm("clear_all_files")).toBe(true);
  });

  it("tool sconosciuto → true (fail-safe)", () => {
    expect(requiresConfirm("unknown_tool_abc")).toBe(true);
  });
});

// ─── getRisk ─────────────────────────────────────────────────────────────────

describe("getRisk", () => {
  it("ritorna il livello corretto per ogni categoria", () => {
    expect(getRisk("web_search")).toBe("safe");
    expect(getRisk("read_file")).toBe("safe");
    expect(getRisk("write_file")).toBe("medium");
    expect(getRisk("pip_install")).toBe("medium");
    expect(getRisk("github_push")).toBe("risky");
    expect(getRisk("delete_file")).toBe("dangerous");
    expect(getRisk("clear_all_files")).toBe("dangerous");
  });

  it("tool sconosciuto → risky (default)", () => {
    expect(getRisk("completely_unknown_xyz")).toBe("risky");
  });
});

// ─── listPolicyRules ─────────────────────────────────────────────────────────

describe("listPolicyRules", () => {
  it("ritorna almeno 20 regole (obiettivo S25)", () => {
    const rules = listPolicyRules();
    expect(rules.length).toBeGreaterThanOrEqual(20);
  });

  it("ogni regola ha tool (string), risk (valido), label, description", () => {
    const validRisks = new Set(["safe", "medium", "risky", "dangerous"]);
    const rules = listPolicyRules();
    for (const r of rules) {
      expect(typeof r.tool).toBe("string");
      expect(r.tool.length, `tool vuoto in rule: ${JSON.stringify(r)}`).toBeGreaterThan(0);
      expect(validRisks.has(r.risk), `risk '${r.risk}' non valido`).toBe(true);
      expect(typeof r.label).toBe("string");
      expect(typeof r.description).toBe("string");
    }
  });

  it("nessun tool duplicato nel registry", () => {
    const rules = listPolicyRules();
    const names = rules.map(r => r.tool);
    const unique = new Set(names);
    expect(unique.size).toBe(names.length);
  });

  it("ogni categoria di rischio ha almeno 1 tool", () => {
    const rules = listPolicyRules();
    const bySafe      = rules.filter(r => r.risk === "safe");
    const byMedium    = rules.filter(r => r.risk === "medium");
    const byRisky     = rules.filter(r => r.risk === "risky");
    const byDangerous = rules.filter(r => r.risk === "dangerous");

    expect(bySafe.length,      "safe tools").toBeGreaterThan(0);
    expect(byMedium.length,    "medium tools").toBeGreaterThan(0);
    expect(byRisky.length,     "risky tools").toBeGreaterThan(0);
    expect(byDangerous.length, "dangerous tools").toBeGreaterThan(0);
  });

  it("listPolicyRules ritorna copia (modifica non altera il registry)", () => {
    const rules = listPolicyRules();
    rules.push({ tool: "fake_hack", risk: "safe", label: "x", description: "x" });
    const rules2 = listPolicyRules();
    expect(rules2.some(r => r.tool === "fake_hack")).toBe(false);
  });
});