/**
 * buildFailureHandler.test.ts — Build Failure Handler (S40)
 * 14 test: action mapping, priority, targetFiles, instructions, DI, guards
 */

import { describe, it, expect, beforeEach } from "vitest";
import {
  handleBuildFailure,
  shouldUseCriticMode,
  extractTargetFiles,
  _setTestHandler,
  _resetHandler,
} from "@/lib/buildFailureHandler";

beforeEach(() => _resetHandler());

// ── handleBuildFailure ────────────────────────────────────────────────────

describe("handleBuildFailure", () => {
  it("1. errore triviale → action=patch, priority=low", () => {
    const d = handleBuildFailure("Unused variable 'x' at line 5.");
    expect(d.action).toBe("patch");
    expect(d.priority).toBe("low");
  });

  it("2. errore serio → action ≠ patch o almeno priority >= medium", () => {
    const d = handleBuildFailure("Cannot find module '@/lib/missing'");
    // action può essere patch/rewrite/split ma priority NON può essere low
    if (d.action === "patch") {
      expect(["medium", "high", "critical"]).toContain(d.priority);
    } else {
      expect(["rewrite", "split", "escalate"]).toContain(d.action);
    }
  });

  it("3. retryCount >= 3 → action=escalate, priority=critical", () => {
    const d = handleBuildFailure("Cannot find module '@/missing'", { retryCount: 3 });
    expect(d.action).toBe("escalate");
    expect(d.priority).toBe("critical");
  });

  it("4. action=split → priority=high", () => {
    // Forza split_task via DI
    _setTestHandler({
      classify: () => "serious",
      analyze: () => ({
        scope: "systemic", strategy: "split_task", confidence: 0.6,
        reason: "Too many retries", affectedFiles: [],
        suggestedAction: "split it", escalate: false,
      }),
    });
    const d = handleBuildFailure("any error", { retryCount: 2 });
    expect(d.priority).toBe("high");
  });

  it("5. instructions è stringa non vuota", () => {
    const d = handleBuildFailure("Build error occurred");
    expect(typeof d.instructions).toBe("string");
    expect(d.instructions.length).toBeGreaterThan(10);
  });

  it("6. instructions contiene [PATCH] per azione patch", () => {
    _setTestHandler({
      classify: () => "trivial",
      analyze: () => ({
        scope: "local", strategy: "patch", confidence: 0.9,
        reason: "trivial", affectedFiles: ["src/foo.ts"],
        suggestedAction: "fix it", escalate: false,
      }),
    });
    const d = handleBuildFailure("Unused variable");
    expect(d.instructions).toContain("[PATCH]");
  });

  it("7. instructions contiene [ESCALATE] per action=escalate", () => {
    const d = handleBuildFailure("Cannot find module '@/lib/missing'", { retryCount: 4 });
    expect(d.instructions).toContain("[ESCALATE]");
  });

  it("8. targetFiles è array (anche vuoto)", () => {
    const d = handleBuildFailure("Generic build error");
    expect(Array.isArray(d.targetFiles)).toBe(true);
  });

  it("9. targetFiles include i file se l'errore li contiene", () => {
    const d = handleBuildFailure(
      "Error in src/lib/taskClassifier.ts: Cannot find module",
    );
    expect(d.targetFiles.some(f => f.includes("taskClassifier.ts"))).toBe(true);
  });

  it("10. usesCriticMode=true per errore serio", () => {
    const d = handleBuildFailure("Cannot find module '@/lib/planner'");
    expect(d.usesCriticMode).toBe(true);
  });

  it("10b. usesCriticMode=false per errore triviale + retryCount=0", () => {
    const d = handleBuildFailure("Unused variable 'x'.");
    expect(d.usesCriticMode).toBe(false);
  });

  it("11. errorSummary è stringa ≤ 200 char", () => {
    const longErr = "E".repeat(500);
    const d = handleBuildFailure(longErr);
    expect(d.errorSummary.length).toBeLessThanOrEqual(200);
  });

  it("12. tutti i campi obbligatori presenti", () => {
    const d = handleBuildFailure("Any error");
    const keys: (keyof typeof d)[] = [
      "action", "priority", "targetFiles", "instructions", "usesCriticMode", "errorSummary",
    ];
    for (const k of keys) {
      expect(d).toHaveProperty(k);
    }
  });
});

// ── shouldUseCriticMode ───────────────────────────────────────────────────

describe("shouldUseCriticMode", () => {
  it("13. cannot find module → true", () => {
    expect(shouldUseCriticMode("Cannot find module '@/foo'")).toBe(true);
  });

  it("13b. unused variable → false", () => {
    expect(shouldUseCriticMode("Unused variable 'y'.")).toBe(false);
  });

  it("13c. retryCount=2 → true qualunque errore", () => {
    expect(shouldUseCriticMode("Minor warning", 2)).toBe(true);
  });
});

// ── extractTargetFiles ────────────────────────────────────────────────────

describe("extractTargetFiles", () => {
  it("14. estrae file da errore con path", () => {
    const files = extractTargetFiles("Error in src/core/agentLoop.ts line 42");
    expect(files.some(f => f.includes("agentLoop.ts"))).toBe(true);
  });

  it("14b. nessun path → array (anche vuoto, non crasha)", () => {
    const files = extractTargetFiles("Build failed.");
    expect(Array.isArray(files)).toBe(true);
  });
});