// Renders .superpowers/findings-ledger.json to FINDINGS.md, and validates it.
// Run:  node .superpowers/render-ledger.mjs           # write FINDINGS.md
//       node .superpowers/render-ledger.mjs --check   # validate only
//       node .superpowers/render-ledger.mjs --selftest # run built-in tests
import assert from "node:assert/strict";

const VALID_STATUS = ["open", "fixed", "declined", "refuted", "duplicate", "blocked"];

// Must stay in lockstep with SEV_RANK below. render() sorts the open section by
// SEV_RANK, and an unranked severity makes the comparator return NaN — which
// leaves the sort order implementation-defined, so the rendering would stop
// being a pure function of the ledger. The drift gate compares the rendering
// against the ledger, so its whole premise rests on this being enforced.
const VALID_SEVERITY = ["critical", "high", "medium", "low"];

export function validate(ledger) {
  const problems = [];
  const ids = new Set();
  for (const r of ledger.findings) {
    if (ids.has(r.id)) problems.push(`duplicate id ${r.id}`);
    ids.add(r.id);
    if (!/^OC-\d{4}$/.test(r.id)) problems.push(`${r.id}: malformed id`);
    if (!VALID_STATUS.includes(r.status)) problems.push(`${r.id}: bad status ${r.status}`);
    if (!VALID_SEVERITY.includes(r.severity)) problems.push(`${r.id}: bad severity ${r.severity}`);
    if (r.status === "fixed" && (!r.fix || !r.fix.commit))
      problems.push(`${r.id}: fixed without a commit`);
    if (r.status === "declined" && !r.rationale)
      problems.push(`${r.id}: declined without a rationale`);
    if (r.status === "duplicate" && !r.duplicateOf)
      problems.push(`${r.id}: duplicate without duplicateOf`);
  }
  return problems;
}

function selftest() {
  // Every fixture carries a severity: validate() now requires one, so omitting
  // it would make each case report two problems and assert against the wrong one.
  assert.deepEqual(validate({ findings: [] }), []);
  assert.deepEqual(
    validate({ findings: [{ id: "OC-0001", severity: "low", status: "fixed", fix: null }] }),
    ["OC-0001: fixed without a commit"],
  );
  assert.deepEqual(validate({ findings: [{ id: "bad", severity: "low", status: "open" }] }), [
    "bad: malformed id",
  ]);
  assert.deepEqual(
    validate({
      findings: [
        { id: "OC-0001", severity: "low", status: "open" },
        { id: "OC-0001", severity: "low", status: "open" },
      ],
    }),
    ["duplicate id OC-0001"],
  );
  assert.deepEqual(
    validate({ findings: [{ id: "OC-0002", severity: "low", status: "declined" }] }),
    ["OC-0002: declined without a rationale"],
  );

  // An unranked severity is what makes render()'s sort implementation-defined.
  assert.deepEqual(
    validate({ findings: [{ id: "OC-0003", severity: "moderate", status: "open" }] }),
    ["OC-0003: bad severity moderate"],
  );
  assert.deepEqual(validate({ findings: [{ id: "OC-0004", status: "open" }] }), [
    "OC-0004: bad severity undefined",
  ]);
  for (const sev of VALID_SEVERITY) {
    assert.deepEqual(
      validate({ findings: [{ id: "OC-0005", severity: sev, status: "open" }] }),
      [],
    );
  }
  console.log("selftest: all assertions pass");
}

const SEV_RANK = { critical: 0, high: 1, medium: 2, low: 3 };

export function render(ledger) {
  const by = (s) => ledger.findings.filter((f) => f.status === s);
  const open = by("open").sort((a, b) => SEV_RANK[a.severity] - SEV_RANK[b.severity]);
  const blocked = by("blocked");
  const fixed = by("fixed");
  const declined = by("declined");
  const refuted = by("refuted");
  const dup = by("duplicate");

  const lines = [];
  lines.push("# OwnCord Findings Ledger", "");
  lines.push(
    "Generated by `render-ledger.mjs`. Do not hand-edit — edit `findings-ledger.json`.",
    "",
  );
  lines.push(
    `**${open.length} open** · ${blocked.length} blocked · ${fixed.length} fixed · ` +
      `${declined.length} declined · ${refuted.length} refuted · ${dup.length} duplicate`,
    "",
  );

  const section = (title, rows, extra) => {
    if (!rows.length) return;
    lines.push(`## ${title}`, "");
    for (const r of rows) {
      lines.push(`### ${r.id} — ${r.severity} — ${r.title}`, "");
      lines.push(
        `\`${r.file}:${r.line}\` · found ${r.found} · hunt \`${r.hunt}\` · lens \`${r.lens}\``,
        "",
      );
      if (r.why) lines.push(r.why, "");
      if (r.repro) lines.push(`**Repro:** ${r.repro}`, "");
      if (r.evidence) lines.push(`**Evidence:** ${r.evidence}`, "");
      if (r.suggestedFix) lines.push(`**Suggested fix:** ${r.suggestedFix}`, "");
      const e = extra && extra(r);
      if (e) lines.push(e, "");
    }
  };

  section("Open", open);
  section("Blocked — fix attempted, revert-proof failed", blocked);
  section(
    "Fixed",
    fixed,
    (r) =>
      `**Fixed:** \`${r.fix.commit}\` · test \`${r.fix.test}\` · revert-proof ${r.fix.revertProof}`,
  );
  section("Declined", declined, (r) => `**Declined:** ${r.rationale}`);
  section("Refuted", refuted);
  section("Duplicate", dup, (r) => `**Duplicate of** ${r.duplicateOf}`);
  return lines.join("\n");
}

async function main() {
  const { readFileSync, writeFileSync } = await import("node:fs");
  const { dirname, join } = await import("node:path");
  const { fileURLToPath } = await import("node:url");
  const here = dirname(fileURLToPath(import.meta.url));
  const ledger = JSON.parse(readFileSync(join(here, "findings-ledger.json"), "utf8"));
  const problems = validate(ledger);
  if (problems.length) {
    for (const p of problems) console.error(`INVALID ${p}`);
    process.exit(1);
  }
  if (process.argv.includes("--check")) {
    console.log(`ledger valid: ${ledger.findings.length} finding(s)`);
    return;
  }
  writeFileSync(join(here, "FINDINGS.md"), render(ledger) + "\n");
  console.log(`wrote FINDINGS.md (${ledger.findings.length} finding(s))`);
}

if (process.argv.includes("--selftest")) selftest();
else await main();