#!/usr/bin/env bun
/**
 * Build `lakehouse_answers_v1` — the gold-standard answer corpus.
 *
 * Sources:
 *   - data/_kb/scrum_reviews.jsonl       (per-file scrum reviews)
 *   - data/_kb/observer_escalations.jsonl (deepseek-v3.1-terminus diagnoses)
 *
 * doc_id prefixes distinguish origin so consumers can same-file-gate
 * (only return `review:<file>` chunks when the focus file matches) or
 * broaden (always include `escalation:` for general task-class signal).
 *
 * Replaces scrum_findings_v1 — broader scope, cleaner gating story.
 *
 * Re-run after every scrum run / observer escalation lands. The
 * pipeline's epilogue calls this; manual runs work too.
 */

import { readFileSync, existsSync } from "node:fs";
import { resolve } from "node:path";

const ROOT = resolve(import.meta.dir, "..");
const GATEWAY = process.env.LH_GATEWAY ?? "http://localhost:3100";
const INDEX_NAME = process.env.LH_CORPUS_NAME ?? "lakehouse_answers_v1";
const SOURCE_LABEL = "lakehouse_answers";
const CHUNK_SIZE = Number(process.env.LH_CHUNK_SIZE ?? 1500);
const OVERLAP = Number(process.env.LH_OVERLAP ?? 150);
const MIN_BYTES = 200;  // skip stub rows

interface Doc { id: string; text: string }

function slugFile(path: string): string {
  return path.replace(/^crates\//, "").replace(/[^a-z0-9]+/gi, "_").slice(0, 40);
}

function compactTs(iso: string): string {
  return iso.replace(/[-:T]/g, "").slice(0, 14);
}

function buildScrumReviewDocs(): Doc[] {
  const path = resolve(ROOT, "data/_kb/scrum_reviews.jsonl");
  if (!existsSync(path)) return [];
  const lines = readFileSync(path, "utf8").split("\n").filter(Boolean);
  const docs: Doc[] = [];
  const idCounts = new Map<string, number>();

  for (const line of lines) {
    let row: any;
    try { row = JSON.parse(line); } catch { continue; }
    const file = row.file ?? "";
    const preview = row.suggestions_preview ?? "";
    if (!file || preview.length < MIN_BYTES) continue;

    const ts = compactTs(row.reviewed_at ?? "");
    const baseId = `review:${slugFile(file)}:${ts || "no_ts"}`;
    const count = (idCounts.get(baseId) ?? 0) + 1;
    idCounts.set(baseId, count);
    const id = count === 1 ? baseId : `${baseId}_${count}`;

    const header = `File: ${file}\nReviewed: ${row.reviewed_at ?? "?"}\nModel: ${row.accepted_model ?? "?"}\nVerdict: ${row.verdict ?? "?"}\n\n`;
    docs.push({ id, text: header + preview });
  }
  return docs;
}

function buildEscalationDocs(): Doc[] {
  const path = resolve(ROOT, "data/_kb/observer_escalations.jsonl");
  if (!existsSync(path)) return [];
  const lines = readFileSync(path, "utf8").split("\n").filter(Boolean);
  const docs: Doc[] = [];
  const idCounts = new Map<string, number>();

  for (const line of lines) {
    let row: any;
    try { row = JSON.parse(line); } catch { continue; }
    const analysis = row.analysis ?? "";
    if (analysis.length < MIN_BYTES) continue;

    const ts = compactTs(row.ts ?? "");
    const sigSlug = String(row.sig_hash ?? "no_sig").slice(0, 12);
    const baseId = `escalation:${sigSlug}:${ts || "no_ts"}`;
    const count = (idCounts.get(baseId) ?? 0) + 1;
    idCounts.set(baseId, count);
    const id = count === 1 ? baseId : `${baseId}_${count}`;

    const header = `Failure cluster · sig_hash=${row.sig_hash ?? "?"} · cluster_size=${row.cluster_size ?? "?"} · endpoint=${row.cluster_endpoint ?? "?"}\nDiagnosed by: ${row.mode ?? "?"}\nWhen: ${row.ts ?? "?"}\n\n`;
    docs.push({ id, text: header + analysis });
  }
  return docs;
}

async function main() {
  const dryRun = process.argv.includes("--dry-run") || process.argv.includes("--print");
  const printOnly = process.argv.includes("--print");

  const reviews = buildScrumReviewDocs();
  const escalations = buildEscalationDocs();
  const docs = [...reviews, ...escalations];
  const totalBytes = docs.reduce((s, d) => s + d.text.length, 0);

  console.log(`[answers] ${docs.length} docs · ${totalBytes} bytes`);
  console.log(`[answers]   reviews:     ${reviews.length}`);
  console.log(`[answers]   escalations: ${escalations.length}`);

  if (printOnly) {
    docs.slice(0, 2).forEach(d => console.log(`  ${d.id} (${d.text.length}b) ${d.text.slice(0, 100).replace(/\n/g, " ")}…`));
    if (escalations.length > 0) {
      console.log(`  ... (last escalation): ${escalations[escalations.length - 1].id}`);
    }
    return;
  }
  if (dryRun) return;
  if (docs.length === 0) {
    console.log("[answers] no docs to index — skipping POST");
    return;
  }

  const r = await fetch(`${GATEWAY}/vectors/index`, {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify({
      index_name: INDEX_NAME,
      source: SOURCE_LABEL,
      documents: docs,
      chunk_size: CHUNK_SIZE,
      overlap: OVERLAP,
    }),
    signal: AbortSignal.timeout(60_000),
  });
  if (!r.ok) {
    console.error(`[answers] HTTP ${r.status}: ${await r.text()}`);
    process.exit(1);
  }
  const j: any = await r.json();
  console.log(`[answers] job ${j.job_id} · ${j.documents} docs → ${j.chunks} chunks queued`);
}

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