/**
 * contextBridge.test.ts — Unit test S29
 *
 * Testa contextBridge:
 *  - enrichSystemPrompt: output compatto + sezioni corrette + max chars
 *  - enrichSystemPrompt: vuoto se brain è empty
 *  - enrichSystemPrompt: rilevanza pagine filtrata per userMsg
 *  - enrichSystemPrompt: non crasha mai (try/catch)
 *  - recordToolResult: read_page → pageCache.set
 *  - recordToolResult: fetch_url → pageCache.set
 *  - recordToolResult: write_file → docIndex.add con lang corretto
 *  - recordToolResult: ❌ errore → errorLog.record
 *  - recordToolResult: tool sconosciuto non crasha
 *  - recordToolResult: url mancante → no call a pageCache
 *  - recordToolResult: path mancante → no call a docIndex
 *  - _setTestBrain: sostituisce brain reale
 *
 * Mock: _setTestBrain() (DI) — zero vi.mock su moduli globali.
 */

import { describe, it, expect, vi, beforeAll, beforeEach } from "vitest";
import {
  enrichSystemPrompt,
  recordToolResult,
  _setTestBrain,
} from "@/lib/contextBridge";
import type { agentBrain } from "@/lib/agentBrain";

// ─── Mock brain factory ────────────────────────────────────────────────────────

type BrainFacade = typeof agentBrain;

function makeMockBrain(overrides: {
  resolvedWithFix?: (_lang?: string) => Array<{ message: string; fix?: string }>;
  recent?:          (_n?: number) => ReturnType<BrainFacade["pageCache"]["recent"]>;
  docSearch?:       (_q: string) => ReturnType<BrainFacade["docIndex"]["search"]>;
  pageSet?:         ReturnType<typeof vi.fn>;
  errorRecord?:     ReturnType<typeof vi.fn>;
  docAdd?:          ReturnType<typeof vi.fn>;
} = {}): BrainFacade {
  const pageSet     = overrides.pageSet     ?? vi.fn();
  const errorRecord = overrides.errorRecord ?? vi.fn();
  const docAdd      = overrides.docAdd      ?? vi.fn();

  return {
    pageCache: {
      set:      pageSet,
      recent:   overrides.recent    ?? ((_n?: number) => []),
      search:   (_q: string) => [],
      get:      (_url: string) => null,
      has:      (_url: string) => false,
      byDomain: (_d: string) => [],
      size:     () => 0,
      clear:    () => {},
    },
    errorLog: {
      resolvedWithFix: overrides.resolvedWithFix ?? ((_lang?: string) => []),
      record:          errorRecord,
      markFixed:       (_h: string, _f: string) => false,
      findSimilar:     (_m: string) => [],
      unresolved:      (_l?: string) => [],
      recent:          (_n?: number) => [],
      hashOf:          (_m: string) => "",
      size:            () => 0,
      clear:           () => {},
    },
    docIndex: {
      search:  overrides.docSearch ?? ((_q: string) => []),
      add:     docAdd,
      get:     (_p: string) => null,
      has:     (_p: string) => false,
      isStale: (_p: string, _c: string) => true,
      byTag:   (_t: string) => [],
      byLang:  (_l: string) => [],
      recent:  (_n?: number) => [],
      size:    () => 0,
      clear:   () => {},
    },
    initBrain: async () => {},
  } as unknown as BrainFacade;
}

// ─── Setup ────────────────────────────────────────────────────────────────────

const emptyBrain = makeMockBrain();

beforeAll(() => {
  _setTestBrain(emptyBrain);
});

beforeEach(() => {
  vi.clearAllMocks();
  _setTestBrain(emptyBrain);
});

// ─── enrichSystemPrompt — brain vuoto ────────────────────────────────────────

describe("enrichSystemPrompt — brain vuoto", () => {
  it("ritorna stringa vuota se nessun dato", () => {
    expect(enrichSystemPrompt("test query")).toBe("");
  });

  it("non crasha mai (try/catch interno)", () => {
    const brokenBrain = makeMockBrain({
      resolvedWithFix: () => { throw new Error("broken"); },
    });
    _setTestBrain(brokenBrain);
    expect(() => enrichSystemPrompt("query")).not.toThrow();
    expect(enrichSystemPrompt("query")).toBe("");
  });

  it("stringa query vuota non crasha", () => {
    expect(() => enrichSystemPrompt("")).not.toThrow();
    expect(enrichSystemPrompt("")).toBe("");
  });
});

// ─── enrichSystemPrompt — fix noti ───────────────────────────────────────────

describe("enrichSystemPrompt — fix noti", () => {
  it("include sezione [FIX NOTI] con errori risolti", () => {
    const brain = makeMockBrain({
      resolvedWithFix: () => [
        { message: "TS2353: Object literal extra property", fix: "rimuovi il campo extra" },
      ],
    });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("debug TypeScript");
    expect(result).toContain("[FIX NOTI]");
    expect(result).toContain("TS2353");
    expect(result).toContain("rimuovi il campo extra");
  });

  it("max 3 fix nel contesto (MAX_ERRORS_IN_CTX)", () => {
    const manyFixes = Array.from({ length: 10 }, (_, i) => ({
      message: `Error${i}`, fix: `Fix${i}`,
    }));
    const brain = makeMockBrain({ resolvedWithFix: () => manyFixes });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("query");
    const fixLines = result.split("\n").filter(l => l.startsWith("•"));
    expect(fixLines.length).toBeLessThanOrEqual(3);
  });

  it("non include [FIX NOTI] se nessun fix disponibile", () => {
    const brain = makeMockBrain({ resolvedWithFix: () => [] });
    _setTestBrain(brain);
    expect(enrichSystemPrompt("query")).not.toContain("[FIX NOTI]");
  });

  it("tronca messaggi lunghi a 70 chars", () => {
    const longMsg = "A".repeat(200);
    const brain = makeMockBrain({
      resolvedWithFix: () => [{ message: longMsg, fix: "B".repeat(200) }],
    });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("query");
    const fixLine = result.split("\n").find(l => l.startsWith("•"));
    expect(fixLine).toBeDefined();
    // message + fix are each ≤70, so line ≤ ~150 chars (plus " → ")
    expect((fixLine ?? "").length).toBeLessThanOrEqual(160);
  });
});

// ─── enrichSystemPrompt — pagine lette ───────────────────────────────────────

describe("enrichSystemPrompt — pagine lette", () => {
  it("include [PAGINE GIÀ LETTE] con le pagine recenti", () => {
    const brain = makeMockBrain({
      recent: () => [{
        url: "https://react.dev/docs/hooks",
        title: "React Hooks",
        summary: "Hooks documentation",
        domain: "react.dev",
        visitedAt: Date.now(),
        visits: 1,
        size: 100,
      }],
    });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("react hooks tutorial");
    expect(result).toContain("[PAGINE GIÀ LETTE]");
    expect(result).toContain("react.dev");
    expect(result).toContain("React Hooks");
  });

  it("filtra per rilevanza: python.org più rilevante per query python", () => {
    const brain = makeMockBrain({
      recent: () => [
        { url: "https://react.dev", title: "React docs", summary: "react documentation hooks", domain: "react.dev", visitedAt: Date.now() - 1000, visits: 1, size: 100 },
        { url: "https://python.org", title: "Python docs", summary: "python programming language", domain: "python.org", visitedAt: Date.now(), visits: 1, size: 100 },
      ],
    });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("python programming tutorial");
    expect(result).toContain("python.org");
  });

  it("S97: nessun fallback cieco — pagine irrilevanti non appaiono nel prompt", () => {
    const brain = makeMockBrain({
      recent: () => [
        { url: "https://example.com/a", title: "Page A", summary: "content A", domain: "example.com", visitedAt: Date.now() - 2000, visits: 1, size: 100 },
        { url: "https://example.com/b", title: "Page B", summary: "content B", domain: "example.com", visitedAt: Date.now() - 1000, visits: 1, size: 100 },
      ],
    });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("completely unrelated zzz query");
    // S97: rimosso fallback cieco (threshold 0.1 → 0.3) — pagine irrilevanti non vengono iniettate
    expect(result).not.toContain("[PAGINE GIÀ LETTE]");
  });

  it("no [PAGINE GIÀ LETTE] se pageCache è vuoto", () => {
    const brain = makeMockBrain({ recent: () => [] });
    _setTestBrain(brain);
    expect(enrichSystemPrompt("react")).not.toContain("[PAGINE GIÀ LETTE]");
  });
});

// ─── enrichSystemPrompt — docs indicizzati ───────────────────────────────────

describe("enrichSystemPrompt — docs indicizzati", () => {
  it("include [DOCS INDICIZZATI] con documenti rilevanti", () => {
    const brain = makeMockBrain({
      docSearch: () => [{
        path: "src/lib/agentBrain",
        title: "agentBrain.ts",
        summary: "browser memory system",
        tags: ["memory", "dexie"],
        contentHash: "abc",
        indexedAt: Date.now(),
        lang: "typescript",
        size: 500,
      }],
    });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("memory dexie");
    expect(result).toContain("[DOCS INDICIZZATI]");
    expect(result).toContain("agentBrain");
  });

  it("aggiunge estensione .ts per typescript", () => {
    const brain = makeMockBrain({
      docSearch: () => [{
        path: "src/lib/utils",
        title: "utils",
        summary: "utility functions",
        tags: [],
        contentHash: "x",
        indexedAt: Date.now(),
        lang: "typescript",
        size: 100,
      }],
    });
    _setTestBrain(brain);
    expect(enrichSystemPrompt("utils")).toContain(".ts");
  });

  it("aggiunge estensione .py per python", () => {
    const brain = makeMockBrain({
      docSearch: () => [{
        path: "scripts/runner",
        title: "runner",
        summary: "script",
        tags: [],
        contentHash: "y",
        indexedAt: Date.now(),
        lang: "python",
        size: 100,
      }],
    });
    _setTestBrain(brain);
    expect(enrichSystemPrompt("script")).toContain(".py");
  });

  it("no [DOCS INDICIZZATI] se docIndex.search ritorna []", () => {
    const brain = makeMockBrain({ docSearch: () => [] });
    _setTestBrain(brain);
    expect(enrichSystemPrompt("query")).not.toContain("[DOCS INDICIZZATI]");
  });
});

// ─── enrichSystemPrompt — max chars ──────────────────────────────────────────

describe("enrichSystemPrompt — max chars", () => {
  it("output ≤ 801 chars (800 + ellipsis)", () => {
    const longFix = { message: "E".repeat(200), fix: "F".repeat(200) };
    const brain = makeMockBrain({
      resolvedWithFix: () => [longFix, longFix, longFix],
      recent: () => [{
        url: "https://example.com/" + "x".repeat(100),
        title: "T".repeat(100),
        summary: "S".repeat(500),
        domain: "example.com",
        visitedAt: Date.now(),
        visits: 1,
        size: 1000,
      }],
    });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("query");
    expect(result.length).toBeLessThanOrEqual(801);
  });

  it("aggiunge '…' se tronca", () => {
    const longFix = { message: "E".repeat(300), fix: "F".repeat(300) };
    const brain = makeMockBrain({ resolvedWithFix: () => [longFix, longFix, longFix] });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("query");
    if (result.length > 800) {
      expect(result.endsWith("…")).toBe(true);
    }
  });

  it("output breve se solo 1 fix corto — no troncamento", () => {
    const brain = makeMockBrain({
      resolvedWithFix: () => [{ message: "Short error", fix: "quick fix" }],
    });
    _setTestBrain(brain);
    const result = enrichSystemPrompt("query");
    expect(result.length).toBeLessThan(200);
    expect(result.endsWith("…")).toBe(false);
  });
});

// ─── recordToolResult — read_page ────────────────────────────────────────────

describe("recordToolResult — read_page", () => {
  it("chiama pageCache.set con url, title estratto, summary, size", () => {
    const pageSet = vi.fn();
    _setTestBrain(makeMockBrain({ pageSet }));
    recordToolResult("read_page", { url: "https://example.com" }, "# Hello World\nContent here");
    expect(pageSet).toHaveBeenCalledOnce();
    const [url, data] = pageSet.mock.calls[0]!;
    expect(url).toBe("https://example.com");
    expect(data.title).toBe("Hello World");
    expect(data.summary).toContain("Content");
    expect(data.size).toBeGreaterThan(0);
  });

  it("usa shortDomain come title se prima riga è vuota", () => {
    const pageSet = vi.fn();
    _setTestBrain(makeMockBrain({ pageSet }));
    recordToolResult("read_page", { url: "https://github.com/user/repo" }, "\n\nno heading");
    const [, data] = pageSet.mock.calls[0]!;
    expect(data.title).toContain("github.com");
  });

  it("non chiama pageCache.set se url è assente", () => {
    const pageSet = vi.fn();
    _setTestBrain(makeMockBrain({ pageSet }));
    recordToolResult("read_page", {}, "some content");
    expect(pageSet).not.toHaveBeenCalled();
  });

  it("tronca summary a 500 chars", () => {
    const pageSet = vi.fn();
    _setTestBrain(makeMockBrain({ pageSet }));
    recordToolResult("read_page", { url: "https://x.com" }, "T\n" + "C".repeat(1000));
    const [, data] = pageSet.mock.calls[0]!;
    expect(data.summary.length).toBeLessThanOrEqual(500);
  });
});

// ─── recordToolResult — fetch_url ────────────────────────────────────────────

describe("recordToolResult — fetch_url", () => {
  it("chiama pageCache.set come read_page", () => {
    const pageSet = vi.fn();
    _setTestBrain(makeMockBrain({ pageSet }));
    recordToolResult("fetch_url", { url: "https://api.example.com/data" }, "json data");
    expect(pageSet).toHaveBeenCalledOnce();
    expect(pageSet.mock.calls[0]![0]).toBe("https://api.example.com/data");
  });
});

// ─── recordToolResult — write_file ───────────────────────────────────────────

describe("recordToolResult — write_file", () => {
  it("chiama docIndex.add con lang typescript per .ts", () => {
    const docAdd = vi.fn();
    _setTestBrain(makeMockBrain({ docAdd }));
    recordToolResult(
      "write_file",
      { path: "src/lib/myModule.ts", content: "export const x = 1;" },
      "✅ Scritto"
    );
    expect(docAdd).toHaveBeenCalledOnce();
    const [path, data] = docAdd.mock.calls[0]!;
    expect(path).toBe("src/lib/myModule.ts");
    expect(data.lang).toBe("typescript");
    expect(data.title).toBe("myModule.ts");
  });

  it("lang python per .py", () => {
    const docAdd = vi.fn();
    _setTestBrain(makeMockBrain({ docAdd }));
    recordToolResult("write_file", { path: "script.py", content: "print('hi')" }, "✅");
    expect(docAdd.mock.calls[0]![1].lang).toBe("python");
  });

  it("lang javascript per .js", () => {
    const docAdd = vi.fn();
    _setTestBrain(makeMockBrain({ docAdd }));
    recordToolResult("write_file", { path: "app.js", content: "const x = 1" }, "✅");
    expect(docAdd.mock.calls[0]![1].lang).toBe("javascript");
  });

  it("lang typescript per .tsx", () => {
    const docAdd = vi.fn();
    _setTestBrain(makeMockBrain({ docAdd }));
    recordToolResult("write_file", { path: "App.tsx", content: "<App/>" }, "✅");
    expect(docAdd.mock.calls[0]![1].lang).toBe("typescript");
  });

  it("non chiama docIndex.add se path mancante", () => {
    const docAdd = vi.fn();
    _setTestBrain(makeMockBrain({ docAdd }));
    recordToolResult("write_file", {}, "content");
    expect(docAdd).not.toHaveBeenCalled();
  });

  it("usa nome file come title", () => {
    const docAdd = vi.fn();
    _setTestBrain(makeMockBrain({ docAdd }));
    recordToolResult("write_file", { path: "deep/nested/file.ts", content: "x" }, "✅");
    expect(docAdd.mock.calls[0]![1].title).toBe("file.ts");
  });
});

// ─── recordToolResult — errori ────────────────────────────────────────────────

describe("recordToolResult — errori", () => {
  it("chiama errorLog.record per result che inizia con ❌", () => {
    const errorRecord = vi.fn();
    _setTestBrain(makeMockBrain({ errorRecord }));
    recordToolResult("web_search", { query: "test" }, "❌ Fetch failed: timeout");
    expect(errorRecord).toHaveBeenCalledOnce();
    const [msg, ctx] = errorRecord.mock.calls[0]!;
    expect(msg).toContain("❌");
    expect(ctx).toBe("tool:web_search");
  });

  it("run_code errore → lang=javascript", () => {
    const errorRecord = vi.fn();
    _setTestBrain(makeMockBrain({ errorRecord }));
    recordToolResult("run_code", { code: "x()" }, "❌ ReferenceError: x is not defined");
    expect(errorRecord.mock.calls[0]![2]).toBe("javascript");
  });

  it("execute_shell errore → lang=javascript", () => {
    const errorRecord = vi.fn();
    _setTestBrain(makeMockBrain({ errorRecord }));
    recordToolResult("execute_shell", { command: "node x.js" }, "❌ Error: ENOENT");
    expect(errorRecord.mock.calls[0]![2]).toBe("javascript");
  });

  it("web_search errore → lang=undefined", () => {
    const errorRecord = vi.fn();
    _setTestBrain(makeMockBrain({ errorRecord }));
    recordToolResult("web_search", {}, "❌ Network error");
    expect(errorRecord.mock.calls[0]![2]).toBeUndefined();
  });

  it("tool sconosciuto con successo → non crasha, non chiama nulla", () => {
    const pageSet = vi.fn();
    const docAdd  = vi.fn();
    const errorRecord = vi.fn();
    _setTestBrain(makeMockBrain({ pageSet, docAdd, errorRecord }));
    expect(() => recordToolResult("unknown_tool", {}, "some output")).not.toThrow();
    expect(pageSet).not.toHaveBeenCalled();
    expect(docAdd).not.toHaveBeenCalled();
    expect(errorRecord).not.toHaveBeenCalled();
  });

  it("fire-and-forget: non lancia anche se brain è broken", () => {
    const brokenBrain = makeMockBrain({
      pageSet:      vi.fn(() => { throw new Error("broken"); }),
      errorRecord:  vi.fn(() => { throw new Error("broken"); }),
      docAdd:       vi.fn(() => { throw new Error("broken"); }),
    });
    _setTestBrain(brokenBrain);
    expect(() => recordToolResult("read_page",  { url: "https://x.com" }, "content")).not.toThrow();
    expect(() => recordToolResult("write_file", { path: "x.ts", content: "x" }, "✅")).not.toThrow();
    expect(() => recordToolResult("web_search", {}, "❌ error")).not.toThrow();
  });
});