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

/**
 * Proof of Concept: Mutation Testing Scores (Gen 2)
 *
 * Demonstrates the Adversary enforcing edge-case quality by consuming structured
 * mutation score data generated from a (simulated) external tool, forcing the Coder
 * agent to rewrite tests if a threshold is not met.
 */

// Simulated output that would normally be generated by a mutation framework like Stryker
// We simulate loading it from a file
async function generateAndLoadMutationReport(filePath: string) {
  await Deno.writeTextFile(
    filePath,
    JSON.stringify({
      mutationScore: 65.4,
      threshold: 80.0,
      survivingMutants: [
        {
          file: "src/auth.ts",
          line: 42,
          mutator: "ConditionalExpression",
          status: "Survived",
        },
      ],
    }),
  );

  return JSON.parse(await Deno.readTextFile(filePath));
}

function verifyQualityGate(report: any): { pass: boolean; feedback: string[] } {
  const feedback = [];
  if (report.mutationScore < report.threshold) {
    feedback.push(
      `Mutation score ${report.mutationScore}% is below threshold ${report.threshold}%`,
    );
  }

  report.survivingMutants.forEach((mutant: any) => {
    if (mutant.status === "Survived") {
      feedback.push(
        `Mutant survived in ${mutant.file}:${mutant.line} via ${mutant.mutator}. Add edge-case test.`,
      );
    }
  });

  return {
    pass: feedback.length === 0,
    feedback,
  };
}

if (import.meta.main) {
  console.log("Running Mutation Testing PoC (Gen 2) tests...");

  try {
    const tempReport = await Deno.makeTempFile({ suffix: ".json" });
    const report = await generateAndLoadMutationReport(tempReport);

    const gate = verifyQualityGate(report);
    assert(
      gate.pass === false,
      "Expected quality gate to fail due to low mutation score",
    );
    assert(
      gate.feedback.length === 2,
      "Expected 2 pieces of critical feedback",
    );

    console.log(
      "Adversary Agent Feedback generated from real File I/O mutation report:",
    );
    gate.feedback.forEach((f) => console.log(` - ${f}`));

    await Deno.remove(tempReport);
    console.log(
      "✅ Mutation Testing PoC (Gen 2) successful: Enforced strict quality gate via structured report data.",
    );
  } catch (err) {
    console.error("❌ Mutation Testing PoC (Gen 2) failed:", err);
    Deno.exit(1);
  }
}