import fs from "node:fs";
import path from "node:path";

const archiveDir = process.env.PROJECTBRAIN_PROOF_ARCHIVE_DIR ?? "checkpoints/release-proof";
const limitArg = process.argv.find((arg) => arg.startsWith("--limit="));
const limit = Number.parseInt(limitArg?.slice("--limit=".length) ?? process.env.PROJECTBRAIN_PROOF_INDEX_LIMIT ?? "10", 10);

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");
  const stat = fs.statSync(filePath);

  return {
    filePath,
    displayPath: displayPath(filePath),
    fileName: path.basename(filePath),
    modifiedAt: stat.mtime.toISOString(),
    generated: parseField(text, "Generated"),
    commit: parseField(text, "Commit"),
    baseUrl: parseField(text, "Base URL"),
    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 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 selectedProofs = proofs.slice(0, Number.isFinite(limit) && limit > 0 ? limit : 10);

const lines = [
  "# ProjectBrain Release Proof Index",
  "",
  `Archive: ${archiveDir}`,
  `Proof snapshots: ${proofs.length}`,
  `Latest passing proof: ${latestPassing ? latestPassing.displayPath : "none"}`,
  "",
];

if (!proofs.length) {
  lines.push("No release proof snapshots found.");
  lines.push("");
  lines.push("Create one with:");
  lines.push("");
  lines.push("```bash");
  lines.push("PROJECTBRAIN_PROOF_WRITE=1 pnpm run release:proof-report");
  lines.push("```");
} else {
  lines.push("| Generated | Verdict | Commit | Project | Smoke | File |");
  lines.push("| --- | --- | --- | --- | --- | --- |");
  for (const proof of selectedProofs) {
    lines.push(`| ${proof.generated} | ${proof.verdict} | ${proof.commit} | ${proof.project} | ${proof.smokeExecution} | ${proof.displayPath} |`);
  }
}

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