/**
 * ciLogReader.test.ts — Unit test S26
 *
 * Testa:
 *  - getLatestRun: parsing della risposta GitHub API
 *  - _fetchErrors: estrazione errori TS da log grezzo
 *  - waitForCI: loop + backoff + timeout (con fake timers)
 *  - Resilienza: fetch fallisce, API non OK, log vuoti
 *
 * Mock: fetch (globale), @/core/events, @/lib/runtimeLogger, @/lib/github
 */
import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";

vi.mock("@/core/events", () => ({
  eventRuntime: { emit: vi.fn() },
}));
vi.mock("@/lib/runtimeLogger", () => ({
  runtimeLogger: { log: vi.fn() },
}));
vi.mock("@/lib/github", () => ({
  getGHToken: vi.fn().mockReturnValue("test-token"),
}));

import { ciLogReader } from "@/lib/ciLogReader";
import type { CIRun }  from "@/lib/ciLogReader";

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

function makeRunResponse(overrides: Partial<{
  status: string; conclusion: string | null; head_sha: string;
}> = {}) {
  return {
    ok:   true,
    json: async () => ({
      workflow_runs: [{
        id:         42,
        name:       "Vercel Auto Deploy",
        status:     'status' in overrides ? overrides.status! : "completed",
        conclusion: 'conclusion' in overrides ? overrides.conclusion : "success",
        head_sha:   overrides.head_sha ?? "abc1234",
        html_url:   "https://github.com",
        created_at: "2026-05-19T08:00:00Z",
      }],
    }),
  };
}

function makeJobsResponse(conclusion: string = "failure") {
  return {
    ok:   true,
    json: async () => ({ jobs: [{ id: 99, conclusion }] }),
  };
}

function makeLogsResponse(log: string) {
  return { ok: true, text: async () => log };
}

// ─── getLatestRun ─────────────────────────────────────────────────────────────

describe("getLatestRun", () => {
  beforeEach(() => vi.clearAllMocks());

  it("ritorna CIRun con i campi corretti da risposta GitHub API", async () => {
    vi.stubGlobal("fetch", vi.fn().mockResolvedValue(makeRunResponse({
      status: "completed", conclusion: "success", head_sha: "deadbeef",
    })));

    const run = await ciLogReader.getLatestRun("Baida98", "AI");
    expect(run).not.toBeNull();
    expect(run!.id).toBe(42);
    expect(run!.status).toBe("completed");
    expect(run!.conclusion).toBe("success");
    expect(run!.commitSha).toBe("deadbeef");
    expect(run!.url).toBe("https://github.com");

    vi.unstubAllGlobals();
  });

  it("ritorna null se fetch fallisce", async () => {
    vi.stubGlobal("fetch", vi.fn().mockRejectedValue(new Error("Network error")));
    const run = await ciLogReader.getLatestRun("Baida98", "AI");
    expect(run).toBeNull();
    vi.unstubAllGlobals();
  });

  it("ritorna null se API risponde non-OK", async () => {
    vi.stubGlobal("fetch", vi.fn().mockResolvedValue({ ok: false, status: 401 }));
    const run = await ciLogReader.getLatestRun("Baida98", "AI");
    expect(run).toBeNull();
    vi.unstubAllGlobals();
  });

  it("ritorna null se workflow_runs è array vuoto", async () => {
    vi.stubGlobal("fetch", vi.fn().mockResolvedValue({
      ok: true, json: async () => ({ workflow_runs: [] }),
    }));
    const run = await ciLogReader.getLatestRun("Baida98", "AI");
    expect(run).toBeNull();
    vi.unstubAllGlobals();
  });

  it("gestisce run con conclusion=null (in_progress)", async () => {
    vi.stubGlobal("fetch", vi.fn().mockResolvedValue(makeRunResponse({
      status: "in_progress", conclusion: null,
    })));
    const run = await ciLogReader.getLatestRun("Baida98", "AI");
    expect(run!.status).toBe("in_progress");
    expect(run!.conclusion).toBeNull();
    vi.unstubAllGlobals();
  });
});

// ─── _fetchErrors ─────────────────────────────────────────────────────────────

describe("_fetchErrors", () => {
  beforeEach(() => vi.clearAllMocks());

  it("estrae errori TypeScript dal log grezzo (pattern TS2353)", async () => {
    const rawLog = [
      "2026-05-19T08:11:29Z ##[group]Run typecheck",
      "src/lib/ciLogReader.ts(71,7): error TS2353: Object literal may only specify known properties, and 'log' does not exist in type 'CIError'.",
      "src/lib/actionPlanner.ts(102,5): error TS2345: Argument of type 'string' is not assignable.",
      "2026-05-19T08:11:29Z ##[error]Process completed with exit code 2.",
    ].join("\n");

    const fetchMock = vi.fn()
      .mockResolvedValueOnce(makeJobsResponse("failure"))   // jobs list
      .mockResolvedValueOnce(makeLogsResponse(rawLog));      // job logs

    vi.stubGlobal("fetch", fetchMock);

    const { errors, rawLog: returned } = await ciLogReader._fetchErrors(
      "Baida98", "AI", 100, "task-001",
    );

    expect(errors).toHaveLength(3); // 2 TS errors + 1 generico ##[error]
    expect(errors[0].step).toBe("typecheck");
    expect(errors[0].message).toContain("TS2353");
    expect(errors[0].file).toBe("src/lib/ciLogReader.ts");
    expect(errors[0].line).toBe(71);
    expect(errors[1].file).toBe("src/lib/actionPlanner.ts");
    expect(errors[1].line).toBe(102);
    expect(errors[2].step).toBe("ci");
    expect(returned).toContain("TS2353");

    vi.unstubAllGlobals();
  });

  it("ritorna errors=[] se nessun job fallito", async () => {
    vi.stubGlobal("fetch", vi.fn().mockResolvedValue(makeJobsResponse("success")));
    const { errors } = await ciLogReader._fetchErrors("Baida98", "AI", 100, "task-002");
    expect(errors).toHaveLength(0);
    vi.unstubAllGlobals();
  });

  it("non duplica errori già parsati come TS nel fallback generico", async () => {
    // La dedup funziona quando ##[error] contiene il messaggio breve TS (es. 'TS2304: ....')
    // e NON la riga intera (che verrebbe riconosciuta di nuovo dal tsPattern)
    const rawLog = [
      "src/lib/foo.ts(10,5): error TS2304: Cannot find name 'x'.",
      "##[error]TS2304: Cannot find name 'x'.",   // breve — viene deduplicato
      "##[error]Process completed with exit code 2.", // generico — viene aggiunto
    ].join("\n");

    vi.stubGlobal("fetch", vi.fn()
      .mockResolvedValueOnce(makeJobsResponse("failure"))
      .mockResolvedValueOnce(makeLogsResponse(rawLog)));

    const { errors } = await ciLogReader._fetchErrors("Baida98", "AI", 100, "task-003");
    const ts2304 = errors.filter(e => e.message.includes("TS2304"));
    expect(ts2304).toHaveLength(1); // solo 1: il ##[error]TS2304 è stato deduplicato
    expect(errors.some(e => e.message.includes("exit code 2"))).toBe(true);
    vi.unstubAllGlobals();
  });

  it("gestisce log che superano 50KB (tronca al max)", async () => {
    const bigLog = "x".repeat(100_000); // 100KB
    vi.stubGlobal("fetch", vi.fn()
      .mockResolvedValueOnce(makeJobsResponse("failure"))
      .mockResolvedValueOnce(makeLogsResponse(bigLog)));
    const { rawLog } = await ciLogReader._fetchErrors("Baida98", "AI", 100, "task-004");
    expect(rawLog.length).toBeLessThanOrEqual(50_000);
    vi.unstubAllGlobals();
  });

  it("ritorna errors=[] se fetch fallisce", async () => {
    vi.stubGlobal("fetch", vi.fn().mockRejectedValue(new Error("Network")));
    const { errors } = await ciLogReader._fetchErrors("Baida98", "AI", 100, "task-005");
    expect(errors).toHaveLength(0);
    vi.unstubAllGlobals();
  });

  it("max 20 errori anche con log con 50 errori TS", async () => {
    const lines = Array.from({ length: 50 }, (_, i) =>
      `src/lib/file${i}.ts(${i + 1},1): error TS${2000 + i}: Error number ${i}.`
    );
    const rawLog = lines.join("\n");

    vi.stubGlobal("fetch", vi.fn()
      .mockResolvedValueOnce(makeJobsResponse("failure"))
      .mockResolvedValueOnce(makeLogsResponse(rawLog)));

    const { errors } = await ciLogReader._fetchErrors("Baida98", "AI", 100, "task-006");
    expect(errors.length).toBeLessThanOrEqual(20);
    vi.unstubAllGlobals();
  });
});

// ─── waitForCI ────────────────────────────────────────────────────────────────

describe("waitForCI", () => {
  beforeEach(() => {
    vi.clearAllMocks();
    vi.useFakeTimers();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.unstubAllGlobals();
  });

  it("ritorna success quando il CI completa al primo poll", async () => {
    // Mock fetch: prima call → completed success
    vi.stubGlobal("fetch", vi.fn().mockResolvedValue(makeRunResponse({
      status: "completed", conclusion: "success", head_sha: "abc1234",
    })));

    const promise = ciLogReader.waitForCI("Baida98", "AI", "abc1234", "task-100");
    await vi.advanceTimersByTimeAsync(5_000); // scatta il setTimeout iniziale
    const result = await promise;

    expect(result.status).toBe("success");
    expect(result.run).not.toBeNull();
    expect(result.errors).toHaveLength(0);
    expect(result.durationMs).toBeGreaterThanOrEqual(0);
  });

  it("ritorna timeout se timeoutMs=0 (loop non entra mai)", async () => {
    vi.stubGlobal("fetch", vi.fn());

    const promise = ciLogReader.waitForCI("Baida98", "AI", "xyz", "task-101", 0);
    const result = await promise;

    expect(result.status).toBe("timeout");
    expect(result.run).toBeNull();
    expect(result.errors).toHaveLength(0);
  });

  it("ritorna failure e popola errors quando CI fallisce", async () => {
    const rawLog = "src/lib/x.ts(5,3): error TS9999: Something broke.";

    vi.stubGlobal("fetch", vi.fn()
      .mockResolvedValueOnce(makeRunResponse({ status: "completed", conclusion: "failure", head_sha: "fail01" }))
      .mockResolvedValueOnce(makeJobsResponse("failure"))
      .mockResolvedValueOnce(makeLogsResponse(rawLog)));

    const promise = ciLogReader.waitForCI("Baida98", "AI", "fail01", "task-102");
    await vi.advanceTimersByTimeAsync(5_000);
    const result = await promise;

    expect(result.status).toBe("failure");
    expect(result.errors.length).toBeGreaterThan(0);
    expect(result.errors[0].message).toContain("TS9999");
  });

  it("ignora run con commitSha diverso e continua a pollare", async () => {
    // Prima risposta: run di un altro commit → viene ignorata
    // Seconda risposta (dopo avanzamento timer): run del commit corretto
    const wrongRun = {
      ok: true,
      json: async () => ({
        workflow_runs: [{
          id: 1, name: "CI", status: "completed", conclusion: "success",
          head_sha: "other_sha", html_url: "https://gh", created_at: "",
        }],
      }),
    };

    vi.stubGlobal("fetch", vi.fn()
      .mockResolvedValueOnce(wrongRun)
      .mockResolvedValueOnce(makeRunResponse({ head_sha: "correct_sha", status: "completed", conclusion: "success" })));

    const promise = ciLogReader.waitForCI("Baida98", "AI", "correct_sha", "task-103");
    await vi.advanceTimersByTimeAsync(5_000);  // primo poll → wrong commit (ignorato)
    await vi.advanceTimersByTimeAsync(10_000); // secondo poll → corretto
    const result = await promise;

    expect(result.status).toBe("success");
    expect(result.run!.commitSha).toBe("correct_sha");
  });
});