import {
  assert,
  assertEquals,
} from "https://deno.land/std@0.224.0/testing/asserts.ts";

/**
 * Proof of Concept: Mutation Testing Scores
 *
 * Demonstrates the Quality Engineer / Adversary agent consuming structured outputs
 * from mutation testing tools (like Stryker) to identify weak tests that merely
 * cover lines of code but fail to assert physical logic correctly.
 */

interface MutationRecord {
  file: string;
  line: number;
  mutatorName: string;
  status: "Killed" | "Survived" | "Timeout";
}

interface MutationReport {
  mutationScore: number;
  mutations: MutationRecord[];
}

const mockMutationReport: MutationReport = {
  mutationScore: 66.6,
  mutations: [
    {
      file: "auth.ts",
      line: 42,
      mutatorName: "EqualityOperator",
      status: "Killed",
    },
    {
      file: "auth.ts",
      line: 45,
      mutatorName: "LogicalUpdate",
      status: "Killed",
    },
    {
      file: "math.ts",
      line: 12,
      mutatorName: "ArithmeticOperator",
      status: "Survived",
    },
  ],
};

function analyzeMutationCoverage(report: MutationReport): string[] {
  const weakSpots = [];

  if (report.mutationScore < 80) {
    weakSpots.push(
      `Global Mutation Score is too low (${report.mutationScore}%). Minimum required is 80%.`,
    );
  }

  const survived = report.mutations.filter((m) => m.status === "Survived");
  for (const mut of survived) {
    weakSpots.push(
      `Weak Test Detected: Mutator '${mut.mutatorName}' survived at ${mut.file}:${mut.line}. Tests are covering the line but missing logic assertions.`,
    );
  }

  return weakSpots;
}

if (import.meta.main) {
  console.log("Running Mutation Testing PoC tests...");

  try {
    const analysis = analyzeMutationCoverage(mockMutationReport);

    console.log("Adversary Mutation Analysis Results:");
    analysis.forEach((a) => console.log(` - ${a}`));

    assertEquals(analysis.length, 2);
    assert(
      analysis.some((a) => a.includes("math.ts")),
      "Expected to flag math.ts for a survived mutation",
    );

    console.log(
      "✅ Mutation Testing PoC successful: Quality engineering constraints enforced via mutation data.",
    );
  } catch (err) {
    console.error("❌ Mutation Testing PoC failed:", err);
    Deno.exit(1);
  }
}