import { assertReadOnly, paramNames } from './sapdb-sql.js';
import { CLIENT_SAPDB_QUERIES } from './sapdb.extensions.js';
import type { SapDbQuery } from './sapdb.types.js';

/** Consultas del proyecto base: solo una de comprobación (la base responde). Las de negocio van en `sapdb.extensions.ts`. */
export const BASE_SAPDB_QUERIES: readonly SapDbQuery[] = [
  {
    name: 'ping',
    title: 'Comprobar la conexión con la base de datos',
    sql: { hana: 'SELECT 1 AS "ok" FROM "DUMMY"' },
    params: {},
    menu: null,
  },
  {
    // Tablas estándar de SAP B1 (OBTQ: cantidad por lote y almacén; OBTN: maestro de lotes; OWHS: almacenes). `absEntry` es el
    // `DocEntry` del lote en el Service Layer.
    name: 'batch-stock',
    title: 'Stock de un lote por almacén',
    sql: {
      hana: `SELECT T1."WhsCode" AS "WarehouseCode", W."WhsName" AS "WarehouseName", T1."Quantity" AS "Quantity",
               T1."CommitQty" AS "Committed", T1."CountQty" AS "Counted"
        FROM "OBTQ" T1
        INNER JOIN "OBTN" T0 ON T1."MdAbsEntry" = T0."AbsEntry" AND T1."ItemCode" = T0."ItemCode"
        LEFT JOIN "OWHS" W ON W."WhsCode" = T1."WhsCode"
        WHERE T0."AbsEntry" = :absEntry
        ORDER BY T1."WhsCode"`,
    },
    params: { absEntry: { type: 'number' } },
    menu: '/inventario/lotes',
    maxRows: 1000,
  },
];

/** Comprueba que los nombres no se repitan, que el SQL sea de solo lectura y que use justo los parámetros declarados. Lanza si no. */
export function validateQueries(queries: readonly SapDbQuery[]): readonly SapDbQuery[] {
  const seen = new Set<string>();
  for (const q of queries) {
    if (!/^[a-z0-9][a-z0-9-]{0,59}$/.test(q.name)) throw new Error(`Nombre de consulta inválido: ${q.name}`);
    if (seen.has(q.name)) throw new Error(`Consulta repetida: ${q.name}`);
    seen.add(q.name);
    const engines = Object.entries(q.sql);
    if (!engines.length) throw new Error(`La consulta ${q.name} no tiene SQL`);
    for (const [engine, sql] of engines) {
      assertReadOnly(`${q.name} (${engine})`, sql);
      const used = new Set(paramNames(sql));
      const declared = new Set(Object.keys(q.params));
      for (const n of used) if (!declared.has(n)) throw new Error(`La consulta ${q.name} (${engine}) usa :${n} sin declararlo`);
      for (const n of declared) if (!used.has(n)) throw new Error(`La consulta ${q.name} (${engine}) declara ${n} y no lo usa`);
    }
  }
  return queries;
}

export const SAPDB_QUERIES: ReadonlyMap<string, SapDbQuery> = new Map(validateQueries([...BASE_SAPDB_QUERIES, ...CLIENT_SAPDB_QUERIES]).map((q) => [q.name, q]));