import { spawnSync } from "node:child_process";
import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import path from "node:path";

import { afterEach, describe, expect, it } from "vitest";

import { loadCiGateContract } from "../../../scripts/contracts/ci-gates.ts";

const temporaryRoots: string[] = [];

afterEach(async () => {
  await Promise.all(
    temporaryRoots.splice(0).map((root) =>
      rm(root, { recursive: true, force: true }),
    ),
  );
});

describe("CI-runner command-generated evidence freshness", () => {
  it("rejects stale command-generated evidence from a successful no-op producer", async () => {
    const root = await mkdtemp(path.join(tmpdir(), "ci-gate-stale-evidence-"));
    temporaryRoots.push(root);
    await mkdir(path.join(root, "config/ci"), { recursive: true });
    await mkdir(path.join(root, "artifacts/tests"), { recursive: true });
    const contract = JSON.parse(
      JSON.stringify(await loadCiGateContract(process.cwd())),
    ) as Record<string, any>;
    const command = contract.commands.find(
      (entry: Record<string, any>) => entry.id === "test-runtime-schema",
    );
    command.script = "test:stale-evidence-noop";
    const evidence = contract.artifacts.find(
      (entry: Record<string, any>) =>
        entry.path === "artifacts/tests/runtime-schema.xml",
    );
    const packageDocument = JSON.parse(
      await readFile("package.json", "utf8"),
    ) as { scripts: Record<string, string> };
    packageDocument.scripts[command.script] = "true";
    await writeFile(
      path.join(root, "config/ci/gates.json"),
      `${JSON.stringify(contract)}\n`,
    );
    await writeFile(
      path.join(root, "package.json"),
      `${JSON.stringify(packageDocument)}\n`,
    );
    await writeFile(
      path.join(root, evidence.path),
      '<testsuite name="stale" tests="0" failures="0"/>\n',
    );

    const result = spawnSync(
      process.execPath,
      [path.resolve("scripts/run-ci-gate.ts"), "FE-GATE-004"],
      { cwd: root, encoding: "utf8", env: { ...process.env, CI: "false" } },
    );

    expect(result.status).toBe(1);
    expect(
      await readFile(
        path.join(root, "artifacts/quality/gates/FE-GATE-004.txt"),
        "utf8",
      ),
    ).toMatch(/not freshly produced/i);
  });

  it("accepts a fresh deterministic rewrite with identical evidence bytes", async () => {
    const root = await mkdtemp(
      path.join(tmpdir(), "ci-gate-identical-rewrite-"),
    );
    temporaryRoots.push(root);
    await mkdir(path.join(root, "config/ci"), { recursive: true });
    await mkdir(path.join(root, "artifacts/tests"), { recursive: true });
    const contract = JSON.parse(
      JSON.stringify(await loadCiGateContract(process.cwd())),
    ) as Record<string, any>;
    const command = contract.commands.find(
      (entry: Record<string, any>) => entry.id === "test-runtime-schema",
    );
    command.script = "test:identical-evidence-rewrite";
    const evidence = contract.artifacts.find(
      (entry: Record<string, any>) =>
        entry.path === "artifacts/tests/runtime-schema.xml",
    );
    const evidenceBytes =
      '<testsuite name="deterministic" tests="0" failures="0"/>\n';
    const packageDocument = JSON.parse(
      await readFile("package.json", "utf8"),
    ) as { scripts: Record<string, string> };
    packageDocument.scripts[command.script] =
      `node -e 'require("node:fs").writeFileSync("${evidence.path}", Buffer.from("${Buffer.from(evidenceBytes).toString("base64")}", "base64"))'`;
    await writeFile(
      path.join(root, "config/ci/gates.json"),
      `${JSON.stringify(contract)}\n`,
    );
    await writeFile(
      path.join(root, "package.json"),
      `${JSON.stringify(packageDocument)}\n`,
    );
    await writeFile(path.join(root, evidence.path), evidenceBytes);

    const result = spawnSync(
      process.execPath,
      [path.resolve("scripts/run-ci-gate.ts"), "FE-GATE-004"],
      { cwd: root, encoding: "utf8", env: { ...process.env, CI: "false" } },
    );

    expect(result.status).toBe(0);
    expect(result.stdout).toMatch(/FE-GATE-004 runtime-schema: PASS/);
  });
});

describe("CI-runner gate output budget", () => {
  it("caps aggregate gate output at the log schema before later commands can accumulate", async () => {
    const root = await mkdtemp(path.join(tmpdir(), "ci-gate-output-budget-"));
    temporaryRoots.push(root);
    await mkdir(path.join(root, "config/ci"), { recursive: true });
    const contract = JSON.parse(
      JSON.stringify(await loadCiGateContract(process.cwd())),
    ) as Record<string, any>;
    const gate = contract.gates.find(
      (entry: Record<string, any>) => entry.id === "FE-GATE-001",
    );
    const command = contract.commands.find(
      (entry: Record<string, any>) => entry.id === gate.commandIds[0],
    );
    command.script = "test:huge-output";
    const logArtifact = contract.artifacts.find(
      (entry: Record<string, any>) => entry.id === gate.logArtifactId,
    );
    const logSchema = contract.artifactSchemas.find(
      (entry: Record<string, any>) => entry.id === logArtifact.schemaId,
    );
    logSchema.maxBytes = 8_192;
    const packageDocument = JSON.parse(
      await readFile("package.json", "utf8"),
    ) as { scripts: Record<string, string> };
    packageDocument.scripts["test:huge-output"] =
      "node -e \"process.stdout.write('x'.repeat(20000))\"";
    await writeFile(
      path.join(root, "config/ci/gates.json"),
      `${JSON.stringify(contract)}\n`,
    );
    await writeFile(
      path.join(root, "package.json"),
      `${JSON.stringify(packageDocument)}\n`,
    );
    const result = spawnSync(
      process.execPath,
      [path.resolve("scripts/run-ci-gate.ts"), "FE-GATE-001"],
      {
        cwd: root,
        encoding: "utf8",
        env: { ...process.env, CI: "false" },
        timeout: 15_000,
      },
    );

    expect(result.status).toBe(1);
    const log = await readFile(path.join(root, logArtifact.path));
    expect(log.byteLength).toBeLessThanOrEqual(8_192);
    expect(log.toString("utf8")).toMatch(
      /aggregate output|INFRASTRUCTURE_FAILURE/i,
    );
  }, 20_000);
});