import { pool } from '../pool.js';
import { recordAudit } from './audit_stub.js';

const FIELDS = [
  'space_id','kind','source_url','title','description','summary',
  'body_text','blob_path','thumbnail','metadata','embedding','status',
  'source_kind','external_id','captured_at'
];

export async function create(input, actor) {
  const cols = [], vals = [], placeholders = [];
  let i = 1;
  for (const f of FIELDS) {
    if (input[f] !== undefined) {
      cols.push(f); vals.push(input[f]); placeholders.push(`$${i++}`);
    }
  }
  const { rows: [r] } = await pool.query(
    `INSERT INTO refs(${cols.join(',')})
     VALUES(${placeholders.join(',')}) RETURNING *`,
    vals
  );
  await recordAudit(actor, 'create', 'ref', r.id, null, r);
  return r;
}

export async function getById(id) {
  const { rows: [r] } = await pool.query(`SELECT * FROM refs WHERE id=$1`, [id]);
  return r;
}

export async function upsertByExternal(input, actor) {
  const { space_id, source_kind, external_id } = input;
  if (!space_id || !source_kind || !external_id) {
    throw new Error('upsertByExternal requires space_id + source_kind + external_id');
  }
  const { rows: [existing] } = await pool.query(
    `SELECT * FROM refs WHERE space_id=$1 AND source_kind=$2 AND external_id=$3`,
    [space_id, source_kind, external_id]
  );
  if (existing) {
    return update(existing.id, input, actor);
  }
  return create(input, actor);
}

export async function list({ space_id, kind, limit = 100, offset = 0 } = {}) {
  const where = [], vals = [];
  let i = 1;
  if (space_id) { where.push(`space_id=$${i++}`); vals.push(space_id); }
  if (kind) { where.push(`kind=$${i++}`); vals.push(kind); }
  const w = where.length ? `WHERE ${where.join(' AND ')}` : '';
  vals.push(limit, offset);
  const { rows } = await pool.query(
    `SELECT * FROM refs ${w} ORDER BY captured_at DESC LIMIT $${i++} OFFSET $${i}`,
    vals
  );
  return rows;
}

export async function update(id, patch, actor) {
  const before = await getById(id);
  const sets = [], vals = [];
  let i = 1;
  for (const f of FIELDS) {
    if (patch[f] !== undefined) { sets.push(`${f}=$${i++}`); vals.push(patch[f]); }
  }
  sets.push(`updated_at=now()`);
  vals.push(id);
  const { rows: [r] } = await pool.query(
    `UPDATE refs SET ${sets.join(', ')} WHERE id=$${i} RETURNING *`,
    vals
  );
  await recordAudit(actor, 'update', 'ref', id, before, r);
  return r;
}

export async function del(id, actor) {
  const before = await getById(id);
  await pool.query(`DELETE FROM refs WHERE id=$1`, [id]);
  await recordAudit(actor, 'delete', 'ref', id, before, null);
}