import { spawnSync } from "node:child_process";
import fs from "node:fs";
import path from "node:path";

const archiveDir = process.env.PROJECTBRAIN_PROOF_ARCHIVE_DIR ?? "checkpoints/release-proof";
const allowStale = process.argv.includes("--allow-stale") || process.env.PROJECTBRAIN_PROOF_ALLOW_STALE === "1";

const run = (command, args) => spawnSync(command, args, {
  encoding: "utf8",
  shell: process.platform === "win32",
});

const getGitCommit = () => {
  const result = run("git", ["rev-parse", "--short", "HEAD"]);
  return result.status === 0 ? result.stdout.trim() : "unknown";
};

const parseField = (text, label) => {
  const match = text.match(new RegExp(`^${label}:\\s*(.+)$`, "m"));
  return match?.[1]?.trim() ?? "unknown";
};

const displayPath = (filePath) => filePath.split(path.sep).join("/");

const parseProof = (filePath) => {
  const text = fs.readFileSync(filePath, "utf8");
  return {
    filePath,
    displayPath: displayPath(filePath),
    fileName: path.basename(filePath),
    generated: parseField(text, "Generated"),
    commit: parseField(text, "Commit"),
    project: parseField(text, "Project"),
    verdict: parseField(text, "Verdict"),
    smokeExecution: text.match(/^- Smoke execution:\s*(.+)$/m)?.[1]?.trim() ?? "unknown",
  };
};

const listProofFiles = () => {
  if (!fs.existsSync(archiveDir)) return [];

  return fs.readdirSync(archiveDir)
    .filter((fileName) => fileName.endsWith(".md"))
    .map((fileName) => path.join(archiveDir, fileName))
    .filter((filePath) => fs.statSync(filePath).isFile());
};

const currentCommit = getGitCommit();
const proofs = listProofFiles()
  .map(parseProof)
  .sort((a, b) => Date.parse(b.generated) - Date.parse(a.generated) || b.fileName.localeCompare(a.fileName));
const latestPassing = proofs.find((proof) => proof.verdict === "PASS");
const freshness = !latestPassing
  ? "missing"
  : latestPassing.commit === currentCommit
    ? "current"
    : "stale";

const lines = [
  "# ProjectBrain Release Proof Freshness",
  "",
  `Archive: ${archiveDir}`,
  `Current commit: ${currentCommit}`,
  `Latest passing proof: ${latestPassing ? latestPassing.displayPath : "none"}`,
  `Proof commit: ${latestPassing?.commit ?? "none"}`,
  `Freshness: ${freshness}`,
  `Strict mode: ${allowStale ? "disabled" : "enabled"}`,
  "",
];

if (latestPassing) {
  lines.push("| Generated | Verdict | Project | Smoke | File |");
  lines.push("| --- | --- | --- | --- | --- |");
  lines.push(`| ${latestPassing.generated} | ${latestPassing.verdict} | ${latestPassing.project} | ${latestPassing.smokeExecution} | ${latestPassing.displayPath} |`);
  lines.push("");
}

if (freshness !== "current") {
  lines.push("Create a fresh passing proof for the current commit with:");
  lines.push("");
  lines.push("```bash");
  lines.push("PROJECTBRAIN_SMOKE_URL=http://127.0.0.1:1209 PROJECTBRAIN_PROOF_RUN_SMOKES=1 PROJECTBRAIN_PROOF_WRITE=1 pnpm run release:proof-report");
  lines.push("```");
}

console.log(lines.join("\n"));

if (!allowStale && freshness !== "current") {
  process.exitCode = 1;
}