// release_freeze.ts — Phase 9 final orchestrator. Runs every gate the
// distillation system has + writes a release manifest + verifies clean
// git state. Never creates the git tag itself — prints the command for
// J to authorize.
//
// USAGE
//   bun run scripts/distillation/release_freeze.ts
//
// Exit code 0 = release-ready. Non-zero = one or more gates failed.

import {
  existsSync, readFileSync, readdirSync, statSync, mkdirSync, writeFileSync,
} from "node:fs";
import { resolve, dirname } from "node:path";
import { spawnSync } from "node:child_process";

const DEFAULT_ROOT = process.env.LH_DISTILL_ROOT ?? "/home/profit/lakehouse";
const VERSION = "v1.0.0";
const TAG = `distillation-${VERSION}`;

// Phase → known commit. Sourced from git log; if a commit gets
// rewritten the manifest will surface the mismatch.
const PHASE_COMMITS: Array<{ phase: string; commit: string; subject: string }> = [
  { phase: "0+1+2 scaffold",       commit: "27b1d27", subject: "distillation: Phase 0 recon + Phase 1 schemas + Phase 2 transforms scaffold" },
  { phase: "2 materializer",        commit: "1ea8029", subject: "distillation: Phase 2 — Evidence View materializer + health audit" },
  { phase: "3 scorer",              commit: "c989253", subject: "distillation: Phase 3 — deterministic Success Scorer" },
  { phase: "4 exports",             commit: "68b6697", subject: "distillation: Phase 4 — dataset export layer" },
  { phase: "5 receipts",            commit: "2cf359a", subject: "distillation: Phase 5 — receipts harness (system-level observability)" },
  { phase: "6 acceptance",          commit: "1b433a9", subject: "distillation: Phase 6 — acceptance gate suite" },
  { phase: "auditor rebuild",       commit: "20a039c", subject: "auditor: rebuild on mode runner + drop tree-split (use distillation substrate)" },
  { phase: "7 replay",              commit: "681f39d", subject: "distillation: Phase 7 — replay-driven local model bootstrapping" },
  { phase: "8 audit-full",          commit: "5bdd159", subject: "distillation: Phase 8 — full system audit" },
];

interface GateResult {
  name: string;
  passed: boolean;
  detail: string;
}

const gates: GateResult[] = [];
function gate(name: string, passed: boolean, detail: string) {
  gates.push({ name, passed, detail });
}

function shell(cmd: string, args: string[], cwd = DEFAULT_ROOT, timeoutMs = 600_000) {
  return spawnSync(cmd, args, { cwd, encoding: "utf8", timeout: timeoutMs, env: { ...process.env, LH_DISTILL_ROOT: cwd } });
}

function gitOutput(args: string[]): string {
  const r = spawnSync("git", ["-C", DEFAULT_ROOT, ...args], { encoding: "utf8" });
  return r.status === 0 ? r.stdout.trim() : "";
}

// ─── Gate 1: clean git state ──────────────────────────────────────

function checkCleanGit() {
  const status = gitOutput(["status", "--porcelain"]);
  // Tolerate two classes of dirty:
  //  1. Untracked artifacts (data/, exports/, /tmp/, reports/distillation/<run_id>/)
  //  2. Auto-regenerated reports under reports/distillation/phase*-*.md +
  //     reports/distillation/release-*.{md,json} — release-freeze itself
  //     rewrites these before it can check the gate
  const lines = status.split("\n").filter(Boolean);
  const tracked = lines.filter(l => /^\s*[MADRCU]/.test(l));
  const concerning = tracked.filter(l => {
    // git status --porcelain format: "XY <path>" where XY is 2-char status
    const m = l.match(/^[\sMADRCU]{2}\s+(.+?)$/);
    const path = m ? m[1] : l.replace(/^\s*[MADRCU]+\s*/, "");
    if (/^reports\/distillation\/phase\d+-.*\.md$/.test(path)) return false;
    if (/^reports\/distillation\/release-.*\.(md|json)$/.test(path)) return false;
    return true;
  });
  const passed = concerning.length === 0;
  gate(
    "clean git state (no source-tree modifications)",
    passed,
    passed
      ? `tree clean (${tracked.length - concerning.length} auto-regenerated reports tolerated)`
      : `${concerning.length} concerning modified file(s):\n${concerning.slice(0, 6).map(l => "  " + l).join("\n")}`,
  );
}

// ─── Gate 2: full test suite ──────────────────────────────────────

function checkTests() {
  const r = shell("bun", ["test", "tests/distillation/", "auditor/schemas/distillation/"]);
  const out = (r.stdout ?? "") + (r.stderr ?? "");
  const m = out.match(/(\d+)\s*pass\s*\n\s*(\d+)\s*fail/);
  const pass = m ? Number(m[1]) : 0;
  const fail = m ? Number(m[2]) : 1;
  gate(
    `full test suite (bun test tests/distillation/ auditor/schemas/distillation/)`,
    r.status === 0 && fail === 0,
    `${pass} pass, ${fail} fail (exit=${r.status})`,
  );
}

// ─── Gate 3: acceptance gate ──────────────────────────────────────

function checkAcceptance() {
  const r = shell("bun", ["run", "scripts/distillation/acceptance.ts"]);
  const out = (r.stdout ?? "") + (r.stderr ?? "");
  const m = out.match(/PASS\s*—\s*(\d+)\/(\d+)/);
  const passed = r.status === 0 && m && m[1] === m[2];
  gate(
    "acceptance gate (22-invariant fixture E2E)",
    !!passed,
    m ? `${m[1]}/${m[2]} invariants` : `exit=${r.status}, no PASS line found`,
  );
}

// ─── Gate 4: full audit ───────────────────────────────────────────

function checkAuditFull() {
  const r = shell("bun", ["run", "scripts/distillation/audit_full.ts"]);
  const out = (r.stdout ?? "") + (r.stderr ?? "");
  const m = out.match(/PASS\s*—\s*(\d+)\/(\d+)\s*required/);
  const passed = r.status === 0 && m && m[1] === m[2];
  gate(
    "audit-full (Phases 0-7 verified + drift)",
    !!passed,
    m ? `${m[1]}/${m[2]} required checks` : `exit=${r.status}`,
  );
}

// ─── Gate 5: tag does not yet exist ──────────────────────────────

function checkTagAvailable() {
  const tags = gitOutput(["tag", "-l", TAG]);
  const exists = tags.trim() === TAG;
  gate(
    `tag ${TAG} available (does not yet exist)`,
    !exists,
    exists ? `tag already exists; bump VERSION or delete the prior tag` : "tag name is free",
  );
}

// ─── Gather dataset/export counts ────────────────────────────────

interface DatasetCounts {
  rag_rows: number;
  sft_rows: number;
  preference_pairs: number;
  evidence_files: number;
  evidence_rows: number;
  scored_files: number;
  scored_rows: number;
  quarantined_total: number;
}

function countLines(path: string): number {
  if (!existsSync(path)) return 0;
  return readFileSync(path, "utf8").split("\n").filter(Boolean).length;
}

function walkCount(dir: string): { files: number; rows: number } {
  if (!existsSync(dir)) return { files: 0, rows: 0 };
  let files = 0, rows = 0;
  function walk(p: string) {
    for (const e of readdirSync(p)) {
      const full = resolve(p, e);
      const st = statSync(full);
      if (st.isDirectory()) walk(full);
      else if (e.endsWith(".jsonl")) { files++; rows += countLines(full); }
    }
  }
  walk(dir);
  return { files, rows };
}

function gatherCounts(root: string): DatasetCounts {
  const ev = walkCount(resolve(root, "data/evidence"));
  const sc = walkCount(resolve(root, "data/scored-runs"));
  return {
    rag_rows: countLines(resolve(root, "exports/rag/playbooks.jsonl")),
    sft_rows: countLines(resolve(root, "exports/sft/instruction_response.jsonl")),
    preference_pairs: countLines(resolve(root, "exports/preference/chosen_rejected.jsonl")),
    evidence_files: ev.files, evidence_rows: ev.rows,
    scored_files: sc.files, scored_rows: sc.rows,
    quarantined_total: ["sft", "rag", "preference"]
      .reduce((acc, n) => acc + countLines(resolve(root, `exports/quarantine/${n}.jsonl`)), 0),
  };
}

// ─── Gather latest baseline ──────────────────────────────────────

function loadLatestBaseline(root: string): any {
  const p = resolve(root, "data/_kb/audit_baselines.jsonl");
  if (!existsSync(p)) return null;
  const lines = readFileSync(p, "utf8").split("\n").filter(Boolean);
  if (lines.length === 0) return null;
  try { return JSON.parse(lines[lines.length - 1]); } catch { return null; }
}

// ─── Verify phase commits actually exist ─────────────────────────

function verifyPhaseCommits() {
  const missing: string[] = [];
  for (const p of PHASE_COMMITS) {
    const full = gitOutput(["rev-parse", p.commit]);
    if (!full || full.length < 40) missing.push(`${p.phase} (${p.commit})`);
  }
  gate(
    "every phase commit resolves",
    missing.length === 0,
    missing.length === 0 ? `${PHASE_COMMITS.length}/${PHASE_COMMITS.length} commits verified` : `missing: ${missing.join(", ")}`,
  );
}

// ─── Build manifest + report ─────────────────────────────────────

interface Manifest {
  schema: "distillation_release_manifest.v1";
  version: string;
  tag: string;
  released_at: string;
  git_head: string;
  git_branch: string;
  phase_commits: typeof PHASE_COMMITS;
  dataset_counts: DatasetCounts;
  latest_baseline: any;
  gates: GateResult[];
  passed: boolean;
}

function renderReport(m: Manifest): string {
  const md: string[] = [];
  md.push("# Distillation Release Freeze — " + m.version);
  md.push("");
  md.push(`**Tag (proposed):** \`${m.tag}\``);
  md.push(`**Released at:** ${m.released_at}`);
  md.push(`**Git head:** \`${m.git_head}\``);
  md.push(`**Branch:** ${m.git_branch}`);
  md.push("");
  md.push(`## Result: ${m.passed ? "**RELEASE-READY** ✓" : "**NOT READY ✗** — one or more gates failed"}`);
  md.push("");

  md.push("## Gates");
  md.push("");
  md.push("| # | Gate | Status | Detail |");
  md.push("|---|---|---|---|");
  for (let i = 0; i < m.gates.length; i++) {
    const g = m.gates[i];
    md.push(`| ${i + 1} | ${g.name} | ${g.passed ? "✓" : "✗ FAIL"} | ${g.detail.split("\n")[0].slice(0, 100)} |`);
  }
  md.push("");

  md.push("## Phase commits");
  md.push("");
  md.push("| Phase | Commit | Subject |");
  md.push("|---|---|---|");
  for (const p of m.phase_commits) {
    md.push(`| ${p.phase} | \`${p.commit}\` | ${p.subject} |`);
  }
  md.push("");

  md.push("## Dataset counts at freeze");
  md.push("");
  md.push("| Artifact | Count |");
  md.push("|---|---|");
  md.push(`| RAG rows                          | ${m.dataset_counts.rag_rows} |`);
  md.push(`| SFT rows (strict accepted-only)   | ${m.dataset_counts.sft_rows} |`);
  md.push(`| Preference pairs                  | ${m.dataset_counts.preference_pairs} |`);
  md.push(`| Evidence files                    | ${m.dataset_counts.evidence_files} |`);
  md.push(`| Evidence rows                     | ${m.dataset_counts.evidence_rows} |`);
  md.push(`| Scored-run files                  | ${m.dataset_counts.scored_files} |`);
  md.push(`| Scored rows                       | ${m.dataset_counts.scored_rows} |`);
  md.push(`| Quarantined total                 | ${m.dataset_counts.quarantined_total} |`);
  md.push("");

  if (m.latest_baseline) {
    md.push("## Latest audit baseline");
    md.push("");
    md.push("```json");
    md.push(JSON.stringify(m.latest_baseline, null, 2));
    md.push("```");
    md.push("");
  }

  md.push("## Tag command (run after release-ready confirmation)");
  md.push("");
  md.push("```bash");
  md.push(`git tag -a ${m.tag} ${m.git_head.slice(0, 12)} -m "distillation v${m.version.replace(/^v/, "")} — 8-phase substrate frozen"`);
  md.push(`git push origin ${m.tag}`);
  md.push("```");
  md.push("");

  md.push("## Failure detail");
  md.push("");
  const failed = m.gates.filter(g => !g.passed);
  if (failed.length === 0) {
    md.push("(no failures)");
  } else {
    for (const g of failed) {
      md.push(`### ${g.name}`);
      md.push("");
      md.push("```");
      md.push(g.detail);
      md.push("```");
      md.push("");
    }
  }

  return md.join("\n");
}

async function main() {
  const root = DEFAULT_ROOT;
  console.log("[release-freeze] running gates...");

  checkCleanGit();
  checkTests();
  verifyPhaseCommits();
  checkAcceptance();
  checkAuditFull();
  checkTagAvailable();

  const counts = gatherCounts(root);
  const baseline = loadLatestBaseline(root);
  const manifest: Manifest = {
    schema: "distillation_release_manifest.v1",
    version: VERSION,
    tag: TAG,
    released_at: new Date().toISOString(),
    git_head: gitOutput(["rev-parse", "HEAD"]),
    git_branch: gitOutput(["rev-parse", "--abbrev-ref", "HEAD"]),
    phase_commits: PHASE_COMMITS,
    dataset_counts: counts,
    latest_baseline: baseline,
    gates,
    passed: gates.every(g => g.passed),
  };

  const reportPath = resolve(root, "reports/distillation/release-freeze.md");
  mkdirSync(dirname(reportPath), { recursive: true });
  writeFileSync(reportPath, renderReport(manifest));

  // Also persist the manifest JSON for machines.
  const manifestPath = resolve(root, "reports/distillation/release-manifest.json");
  writeFileSync(manifestPath, JSON.stringify(manifest, null, 2) + "\n");

  console.log("");
  console.log(`[release-freeze] ${manifest.passed ? "RELEASE-READY" : "NOT READY"} — ${gates.filter(g => g.passed).length}/${gates.length} gates passed`);
  for (const g of gates) {
    console.log(`  ${g.passed ? "✓" : "✗"} ${g.name}`);
    if (!g.passed) console.log(`     ${g.detail.split("\n").slice(0, 2).join(" | ")}`);
  }
  console.log("");
  console.log(`[release-freeze] manifest: ${manifestPath}`);
  console.log(`[release-freeze] report:   ${reportPath}`);
  if (manifest.passed) {
    console.log("");
    console.log("To create the tag (manual step — operator must confirm):");
    console.log(`  git tag -a ${TAG} -m "distillation v${VERSION.replace(/^v/, "")} — 8-phase substrate frozen"`);
    console.log(`  git push origin ${TAG}`);
  }

  process.exit(manifest.passed ? 0 : 1);
}

if (import.meta.main) main().catch(e => { console.error(e); process.exit(1); });