// acceptance.ts — Phase 6 final gate. Runs the entire distillation
// pipeline end-to-end on a fixture set covering every spec case,
// asserts every invariant, then runs a SECOND time with the same
// recorded_at and asserts hash reproducibility.
//
// Exits non-zero if ANY invariant fails. Writes
// reports/distillation/phase6-acceptance-report.md with the
// expected-vs-actual table.
//
// USAGE
//   bun run scripts/distillation/acceptance.ts
//   ./scripts/distill.ts acceptance

import {
  existsSync, readFileSync, mkdirSync, rmSync, writeFileSync, readdirSync, statSync, copyFileSync,
} from "node:fs";
import { resolve, basename } from "node:path";

import { runAllWithReceipts } from "./receipts";
import { validateStageReceipt } from "../../auditor/schemas/distillation/stage_receipt";
import { validateRunSummary } from "../../auditor/schemas/distillation/run_summary";
import { validateDriftReport } from "../../auditor/schemas/distillation/drift_report";

const REPO_ROOT = process.env.LH_DISTILL_ROOT ?? "/home/profit/lakehouse";
const FIXTURE_DIR = resolve(REPO_ROOT, "tests/fixtures/distillation/acceptance");
const TMP_ROOT = "/tmp/distillation_phase6_acceptance";
const RECORDED_AT = "2026-04-26T22:30:00.000Z";

interface Check {
  name: string;
  passed: boolean;
  expected: string;
  actual: string;
}

const checks: Check[] = [];

function record(name: string, expected: string, actual: string, passed: boolean) {
  checks.push({ name, expected, actual, passed });
}

function readJsonl(path: string): any[] {
  if (!existsSync(path)) return [];
  return readFileSync(path, "utf8").split("\n").filter(Boolean).map(l => JSON.parse(l));
}

function setupFreshRoot(rootPath: string) {
  if (existsSync(rootPath)) rmSync(rootPath, { recursive: true, force: true });
  mkdirSync(resolve(rootPath, "data/_kb"), { recursive: true });

  // Copy fixture jsonls
  const fixtureKb = resolve(FIXTURE_DIR, "data/_kb");
  for (const f of readdirSync(fixtureKb)) {
    if (f.endsWith(".jsonl")) {
      copyFileSync(resolve(fixtureKb, f), resolve(rootPath, "data/_kb", f));
    }
  }

  // Init git so receipts capture a commit hash
  Bun.spawnSync(["git", "init", "-q"], { cwd: rootPath });
  Bun.spawnSync(["git", "-C", rootPath, "config", "user.email", "acceptance@test"]);
  Bun.spawnSync(["git", "-C", rootPath, "config", "user.name", "acceptance"]);
  Bun.spawnSync(["git", "-C", rootPath, "add", "."]);
  Bun.spawnSync(["git", "-C", rootPath, "commit", "-q", "-m", "fixture"]);
}

async function run(rootPath: string, run_id: string) {
  return await runAllWithReceipts({
    root: rootPath, recorded_at: RECORDED_AT, run_id,
  });
}

async function main() {
  console.log("[acceptance] setting up fresh root with fixtures...");
  setupFreshRoot(TMP_ROOT);

  console.log("[acceptance] running pipeline (run 1/2)...");
  const r1 = await run(TMP_ROOT, "acceptance-run-1-stable");

  // ── Invariant 1: receipts exist for all 5 stages ──
  const runDir = resolve(TMP_ROOT, "reports/distillation", r1.run_id);
  const expected_stages = ["collect", "score", "export-rag", "export-sft", "export-preference"];
  const missing = expected_stages.filter(s => !existsSync(resolve(runDir, `${s}.json`)));
  record(
    "receipts: all 5 stages emitted",
    expected_stages.join(","),
    missing.length === 0 ? "all present" : `missing: ${missing.join(",")}`,
    missing.length === 0,
  );

  // ── Invariant 2: summary + drift exist ──
  record(
    "summary.json exists",
    "exists",
    existsSync(resolve(runDir, "summary.json")) ? "exists" : "missing",
    existsSync(resolve(runDir, "summary.json")),
  );
  record(
    "summary.md exists",
    "exists",
    existsSync(resolve(runDir, "summary.md")) ? "exists" : "missing",
    existsSync(resolve(runDir, "summary.md")),
  );
  record(
    "drift.json exists",
    "exists",
    existsSync(resolve(runDir, "drift.json")) ? "exists" : "missing",
    existsSync(resolve(runDir, "drift.json")),
  );

  // ── Invariant 3: every receipt validates against StageReceipt schema ──
  let invalidReceipts = 0;
  for (const stage of expected_stages) {
    const path = resolve(runDir, `${stage}.json`);
    if (!existsSync(path)) continue;
    const v = validateStageReceipt(JSON.parse(readFileSync(path, "utf8")));
    if (!v.valid) invalidReceipts++;
  }
  record(
    "every StageReceipt validates against schema",
    "0 invalid",
    `${invalidReceipts} invalid`,
    invalidReceipts === 0,
  );

  // ── Invariant 4: RunSummary + DriftReport validate ──
  const summary = JSON.parse(readFileSync(resolve(runDir, "summary.json"), "utf8"));
  const drift = JSON.parse(readFileSync(resolve(runDir, "drift.json"), "utf8"));
  record("RunSummary validates", "valid", validateRunSummary(summary).valid ? "valid" : "invalid", validateRunSummary(summary).valid);
  record("DriftReport validates", "valid", validateDriftReport(drift).valid ? "valid" : "invalid", validateDriftReport(drift).valid);

  // ── Invariant 5: SFT contains accepted records ──
  const sftRows = readJsonl(resolve(TMP_ROOT, "exports/sft/instruction_response.jsonl"));
  record(
    "SFT: ≥1 accepted record exported",
    ">=1",
    `${sftRows.length}`,
    sftRows.length >= 1,
  );

  // ── Invariant 6: SFT NEVER contains forbidden quality_score ──
  const sftForbidden = sftRows.filter(r => r.quality_score !== "accepted" && r.quality_score !== "partially_accepted");
  record(
    "SFT contamination firewall: no rejected/needs_human_review",
    "0",
    `${sftForbidden.length}`,
    sftForbidden.length === 0,
  );

  // ── Invariant 6b: SFT default excludes partially_accepted ──
  const sftPartialDefault = sftRows.filter(r => r.quality_score === "partially_accepted");
  record(
    "SFT default mode: 0 partial leaks (no --include-partial used)",
    "0",
    `${sftPartialDefault.length}`,
    sftPartialDefault.length === 0,
  );

  // ── Invariant 7: RAG contains accepted + partially_accepted; never rejected ──
  const ragRows = readJsonl(resolve(TMP_ROOT, "exports/rag/playbooks.jsonl"));
  const ragRejected = ragRows.filter(r => r.success_score === "rejected");
  record(
    "RAG: 0 rejected leaks",
    "0",
    `${ragRejected.length}`,
    ragRejected.length === 0,
  );
  const ragPartial = ragRows.filter(r => r.success_score === "partially_accepted");
  record(
    "RAG: ≥1 partially_accepted accepted (RAG accepts partial)",
    ">=1",
    `${ragPartial.length}`,
    ragPartial.length >= 1,
  );

  // ── Invariant 8: Preference pairs exported AND no self-pairs / identical text ──
  const prefRows = readJsonl(resolve(TMP_ROOT, "exports/preference/chosen_rejected.jsonl"));
  record(
    "Preference: ≥1 valid pair exported",
    ">=1",
    `${prefRows.length}`,
    prefRows.length >= 1,
  );
  const prefSelfPairs = prefRows.filter(r => r.chosen_run_id === r.rejected_run_id);
  record(
    "Preference: 0 self-pairs (chosen_run_id != rejected_run_id)",
    "0",
    `${prefSelfPairs.length}`,
    prefSelfPairs.length === 0,
  );
  const prefIdenticalText = prefRows.filter(r => r.chosen === r.rejected);
  record(
    "Preference: 0 identical-text pairs",
    "0",
    `${prefIdenticalText.length}`,
    prefIdenticalText.length === 0,
  );

  // ── Invariant 9: every export row has provenance.sig_hash ──
  const allExportRows = [...ragRows, ...sftRows, ...prefRows];
  const noProv = allExportRows.filter(r => !r.provenance?.sig_hash || !/^[0-9a-f]{64}$/.test(r.provenance.sig_hash));
  record(
    "every export row has valid sha256 provenance.sig_hash",
    "0 missing",
    `${noProv.length} missing`,
    noProv.length === 0,
  );

  // ── Invariant 10: missing-provenance fixture row was skipped, not exported ──
  // The fixture row in scrum_reviews.jsonl missing reviewed_at should
  // fail the EvidenceRecord schema → land in distillation_skips.jsonl,
  // not in any export.
  const skipsPath = resolve(TMP_ROOT, "data/_kb/distillation_skips.jsonl");
  const hadSkips = existsSync(skipsPath) && readJsonl(skipsPath).length >= 1;
  record(
    "Phase 2 collect: missing-provenance fixture row skipped to distillation_skips.jsonl",
    "≥1 skip recorded",
    hadSkips ? `${readJsonl(skipsPath).length} skip(s)` : "no skips file",
    hadSkips,
  );

  // ── Invariant 11: quarantine populated for SFT (forbidden categories) ──
  const sftQuarantine = readJsonl(resolve(TMP_ROOT, "exports/quarantine/sft.jsonl"));
  const unsafeCategoryEntries = sftQuarantine.filter(e => e.reason === "unsafe_sft_category");
  record(
    "SFT quarantine: rejected/needs_human caught at unsafe_sft_category gate",
    "≥1",
    `${unsafeCategoryEntries.length}`,
    unsafeCategoryEntries.length >= 1,
  );

  // ── Invariant 12: quarantine populated for preference (invalid pairs) ──
  // Fixture has rows acc-scrum-1 (accepted) and acc-scrum-2 (partial) on same task_id.
  // We expect a valid pair from those. acc-scrum-3 is needs_human, observer_reviews
  // adds accept+reject on same file — that yields the strong pair.
  // No invalid pairs in this fixture by default — check the file exists if any.

  // ── Invariant 13: scratchpad/tree-split fixture row materialized ──
  const evidencePath = resolve(TMP_ROOT, "data/evidence/2026/04/26");
  const evScrum = existsSync(resolve(evidencePath, "scrum_reviews.jsonl"))
    ? readJsonl(resolve(evidencePath, "scrum_reviews.jsonl"))
    : [];
  const treeSplitRow = evScrum.find(r => r.text?.includes("Tree-split scratchpad case"));
  record(
    "scratchpad/tree-split case: fixture row materialized into evidence",
    "found",
    treeSplitRow ? "found" : "not found",
    !!treeSplitRow,
  );

  // ── Invariant 14: PRD drift example present in evidence and scored ──
  const evAudits = existsSync(resolve(evidencePath, "audits.jsonl"))
    ? readJsonl(resolve(evidencePath, "audits.jsonl"))
    : [];
  // Audits transform stores `evidence` field as text (preferred over `resolution`),
  // so search for the audit's evidence content. Fixture row #2 carries
  // "no CircuitBreaker / break_on_failures" which is the PRD-drift signature.
  const prdDriftRow = evAudits.find(r => r.text?.includes("CircuitBreaker") || r.text?.includes("break_on_failures"));
  record(
    "PRD drift case: fixture row materialized",
    "found",
    prdDriftRow ? "found" : "not found",
    !!prdDriftRow,
  );

  // ── Invariant 15: HASH REPRODUCIBILITY — second run with same recorded_at matches ──
  console.log("[acceptance] running pipeline (run 2/2) for hash reproducibility...");
  // Wipe outputs but keep fixtures + git
  rmSync(resolve(TMP_ROOT, "data/evidence"), { recursive: true, force: true });
  rmSync(resolve(TMP_ROOT, "data/scored-runs"), { recursive: true, force: true });
  rmSync(resolve(TMP_ROOT, "exports"), { recursive: true, force: true });
  rmSync(resolve(TMP_ROOT, "data/_kb/distillation_skips.jsonl"), { force: true });
  rmSync(resolve(TMP_ROOT, "data/_kb/scoring_skips.jsonl"), { force: true });

  const r2 = await run(TMP_ROOT, "acceptance-run-2-stable");

  // Compare per-stage output hashes — must match
  const r1Stages = new Map(r1.summary.stages.map(s => [s.stage, s]));
  let hashMismatches = 0;
  const mismatchDetail: string[] = [];
  for (const s2 of r2.summary.stages) {
    const s1 = r1Stages.get(s2.stage);
    if (!s1) { hashMismatches++; mismatchDetail.push(`stage ${s2.stage} missing in run1`); continue; }
    if (s1.output_hash !== s2.output_hash) {
      hashMismatches++;
      mismatchDetail.push(`${s2.stage}: ${s1.output_hash.slice(0,12)}... → ${s2.output_hash.slice(0,12)}...`);
    }
  }
  record(
    "hash reproducibility: per-stage output_hash identical across runs",
    "0 mismatches",
    hashMismatches === 0 ? "all match" : `${hashMismatches} mismatch: ${mismatchDetail.join("; ")}`,
    hashMismatches === 0,
  );
  record(
    "hash reproducibility: run_hash identical",
    r1.summary.run_hash.slice(0, 16) + "...",
    r2.summary.run_hash.slice(0, 16) + "...",
    r1.summary.run_hash === r2.summary.run_hash,
  );

  // ── Aggregate result ──
  const passed = checks.every(c => c.passed);
  const failedCount = checks.filter(c => !c.passed).length;

  // ── Write report ──
  const reportPath = resolve(REPO_ROOT, "reports/distillation/phase6-acceptance-report.md");
  const md: string[] = [];
  md.push("# Phase 6 — Acceptance Gate Report");
  md.push("");
  md.push(`**Run:** ${new Date().toISOString()}`);
  md.push(`**Fixture:** \`tests/fixtures/distillation/acceptance/\``);
  md.push(`**Temp root:** \`${TMP_ROOT}\``);
  md.push(`**Pipeline run_ids:** \`${r1.run_id}\` (first) + \`${r2.run_id}\` (second / hash reproducibility)`);
  md.push("");
  md.push(`## Result: ${passed ? "**PASS** ✓" : `**FAIL ✗ — ${failedCount}/${checks.length} checks failed**`}`);
  md.push("");
  md.push("## Pipeline counts (first run)");
  md.push("");
  md.push(`- collect:           ${r1.summary.stages.find(s => s.stage === "collect")?.records_out ?? 0} records out · ${r1.summary.stages.find(s => s.stage === "collect")?.skipped ?? 0} skipped`);
  md.push(`- score:             accepted=${r1.summary.stages.find(s => s.stage === "score")?.accepted ?? 0} rejected=${r1.summary.stages.find(s => s.stage === "score")?.rejected ?? 0} quarantined=${r1.summary.stages.find(s => s.stage === "score")?.quarantined ?? 0}`);
  md.push(`- export-rag:        ${ragRows.length} rows`);
  md.push(`- export-sft:        ${sftRows.length} rows`);
  md.push(`- export-preference: ${prefRows.length} pairs`);
  md.push("");
  md.push("## Invariant checks (expected vs actual)");
  md.push("");
  md.push("| # | Check | Expected | Actual | Status |");
  md.push("|---|---|---|---|---|");
  for (let i = 0; i < checks.length; i++) {
    const c = checks[i];
    md.push(`| ${i + 1} | ${c.name} | ${c.expected} | ${c.actual} | ${c.passed ? "✓" : "✗ FAIL"} |`);
  }
  md.push("");
  md.push("## Hash reproducibility detail");
  md.push("");
  md.push(`run 1 run_hash: \`${r1.summary.run_hash}\``);
  md.push("");
  md.push(`run 2 run_hash: \`${r2.summary.run_hash}\``);
  md.push("");
  md.push(r1.summary.run_hash === r2.summary.run_hash
    ? "**Bit-for-bit identical.** Two runs of the entire pipeline on the same fixture with the same `recorded_at` produce the same outputs. Distillation is deterministic."
    : "**HASHES DIVERGED.** Same fixture, same recorded_at, different outputs. This is a determinism violation — investigate before any of these outputs become training data.");
  md.push("");
  md.push("## Leak prevention confirmation");
  md.push("");
  md.push(`- SFT rows with rejected/needs_human_review quality_score: **${sftForbidden.length}** (must be 0)`);
  md.push(`- SFT rows with partially_accepted quality_score (default mode): **${sftPartialDefault.length}** (must be 0; would only appear with --include-partial)`);
  md.push(`- RAG rows with rejected success_score: **${ragRejected.length}** (must be 0)`);
  md.push(`- Preference self-pairs (chosen_run_id == rejected_run_id): **${prefSelfPairs.length}** (must be 0)`);
  md.push(`- Preference identical-text pairs: **${prefIdenticalText.length}** (must be 0)`);
  md.push("");
  md.push("## What this proves");
  md.push("");
  md.push(passed
    ? "The distillation pipeline is **safe, reproducible, and gated**. Accepted data flows through; rejected/needs_human_review data is quarantined with reasons; preference pairs are real, not fabricated; every output traces to source via canonical sha256; running the whole pipeline twice on the same fixture produces byte-identical outputs."
    : "**ACCEPTANCE FAILED.** Inspect the failed rows above before treating any output of this pipeline as training-safe.");
  md.push("");

  mkdirSync(resolve(REPO_ROOT, "reports/distillation"), { recursive: true });
  writeFileSync(reportPath, md.join("\n"));

  // ── stdout summary ──
  console.log("");
  console.log(`[acceptance] ${passed ? "PASS" : "FAIL"} — ${checks.filter(c => c.passed).length}/${checks.length} checks`);
  if (!passed) {
    for (const c of checks.filter(c => !c.passed)) {
      console.log(`  ✗ ${c.name}: expected ${c.expected}, got ${c.actual}`);
    }
  }
  console.log(`[acceptance] report: ${reportPath}`);

  // Cleanup tmp on success; leave on fail for inspection
  if (passed) rmSync(TMP_ROOT, { recursive: true, force: true });

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

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