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

const proofDir = process.env.PROJECTBRAIN_PROOF_ARCHIVE_DIR ?? "checkpoints/release-proof";
const signoffDir = process.env.PROJECTBRAIN_SIGNOFF_ARCHIVE_DIR ?? "checkpoints/release-signoff";
const deploymentProofDir = process.env.PROJECTBRAIN_DEPLOY_PROOF_ARCHIVE_DIR ?? "checkpoints/deployment-proof";
const dossierOut = process.env.PROJECTBRAIN_RELEASE_DOSSIER_OUT;

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 listMarkdownFiles = (archiveDir) => {
  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 sortNewestFirst = (items) => items.sort((a, b) => {
  const generatedDelta = Date.parse(b.generated) - Date.parse(a.generated);
  if (Number.isFinite(generatedDelta) && generatedDelta !== 0) return generatedDelta;
  return b.fileName.localeCompare(a.fileName);
});

const parseArtifact = (filePath, type) => {
  const text = fs.readFileSync(filePath, "utf8");
  const generated = parseField(text, "Generated");
  const commit = type === "deployment"
    ? parseField(text, "Local commit")
    : parseField(text, "Commit");

  return {
    type,
    text,
    filePath,
    displayPath: displayPath(filePath),
    fileName: path.basename(filePath),
    generated,
    commit,
    verdict: parseField(text, "Verdict"),
    freshness: type === "deployment"
      ? parseField(text, "Commit freshness")
      : parseField(text, "Freshness"),
  };
};

const findLatestCurrentArtifact = (archiveDir, type, currentCommit) => {
  const artifacts = sortNewestFirst(listMarkdownFiles(archiveDir).map((filePath) => parseArtifact(filePath, type)));

  return artifacts.find((artifact) => {
    if (artifact.commit !== currentCommit) return false;
    if (type === "proof") return artifact.verdict === "PASS";
    if (type === "signoff") return artifact.freshness === "current";
    if (type === "deployment") return artifact.verdict === "PASS" && artifact.freshness === "current";
    return false;
  });
};

const indentArtifact = (artifact) => artifact.text
  .split("\n")
  .map((line) => line ? `> ${line}` : ">")
  .join("\n");

const createDefaultDossierPath = (commit) => {
  const stamp = new Date().toISOString().replace(/[:.]/g, "-");
  return `checkpoints/release-dossier/projectbrain-release-dossier-${commit}-${stamp}.md`;
};

const currentCommit = getGitCommit();
const proof = findLatestCurrentArtifact(proofDir, "proof", currentCommit);
const signoff = findLatestCurrentArtifact(signoffDir, "signoff", currentCommit);
const deployment = findLatestCurrentArtifact(deploymentProofDir, "deployment", currentCommit);
const missing = [
  proof ? null : "current passing release proof",
  signoff ? null : "current release signoff",
  deployment ? null : "current passing deployment proof",
].filter(Boolean);

if (missing.length) {
  console.error("Cannot create release evidence dossier: missing required current artifacts.");
  for (const item of missing) console.error(`- ${item}`);
  console.error("Run: PROJECTBRAIN_RELEASE_DEPLOYMENT_PROOF=1 pnpm run release:bundle");
  process.exit(1);
}

const dossierPath = dossierOut || createDefaultDossierPath(currentCommit);
const dossier = [
  "# ProjectBrain Release Evidence Dossier",
  "",
  `Generated: ${new Date().toISOString()}`,
  `Commit: ${currentCommit}`,
  `Verdict: PASS`,
  "",
  "## Included Artifacts",
  "",
  "| Artifact | Generated | Source |",
  "| --- | --- | --- |",
  `| Release proof | ${proof.generated} | ${proof.displayPath} |`,
  `| Operator signoff | ${signoff.generated} | ${signoff.displayPath} |`,
  `| Deployment proof | ${deployment.generated} | ${deployment.displayPath} |`,
  "",
  "## Operator Summary",
  "",
  "- Release operator smoke suite passed for the current commit.",
  "- Release proof freshness is current.",
  "- Operator signoff file exists for the current commit.",
  "- Remote deployment proof passed for the current commit.",
  "- Tower health and ProjectBrain containers were proven by the deployment proof.",
  "",
  "## Release Proof",
  "",
  indentArtifact(proof),
  "",
  "## Operator Signoff",
  "",
  indentArtifact(signoff),
  "",
  "## Remote Deployment Proof",
  "",
  indentArtifact(deployment),
  "",
  "## Tower Commands",
  "",
  "```bash",
  "cd /mnt/pool/appdata/brain",
  "docker compose build --no-cache frontend",
  "docker compose up -d",
  "```",
].join("\n");

fs.mkdirSync(path.dirname(dossierPath), { recursive: true });
fs.writeFileSync(dossierPath, `${dossier}\n`, "utf8");

console.log(dossier);
console.log(`\nRelease evidence dossier written to ${dossierPath}`);