import {
  isModuleDatabaseError,
  type ModuleDatabaseError,
  type ModuleDatabaseParameter,
  type ModuleDatabaseQuery,
} from "@ekklesia/contracts";

/** SQL text and values ready to pass directly to a Module Database ABI v1 executor. */
export type ModuleSqlQuery = Readonly<Required<Pick<ModuleDatabaseQuery, "text" | "values">>>;

/**
 * Builds one PostgreSQL statement without ever interpolating a value into its text.
 *
 * Every interpolation becomes the next positional parameter. Dynamic identifiers and trusted SQL
 * fragments are deliberately unsupported in v1: keep identifiers in the static template text.
 */
export function sql(
  strings: TemplateStringsArray,
  ...values: readonly ModuleDatabaseParameter[]
): ModuleSqlQuery {
  let text = strings[0] ?? "";
  for (let index = 0; index < values.length; index += 1) {
    text += `$${index + 1}${strings[index + 1] ?? ""}`;
  }
  return Object.freeze({ text, values: Object.freeze([...values]) });
}

export type EkklesiaDatabaseError = Pick<
  ModuleDatabaseError,
  "code" | "message" | "name" | "sqlState"
>;

/**
 * Finds a stable Ekklesia database error through wrappers such as DrizzleQueryError.
 *
 * Callers inspect the returned `code` and `sqlState`; they never need a PostgreSQL driver error,
 * `.cause.code`, or message parsing.
 */
export function findEkklesiaDatabaseError(value: unknown): EkklesiaDatabaseError | undefined {
  const visited = new Set<unknown>();
  let current = value;
  while (current instanceof Error && !visited.has(current)) {
    if (isModuleDatabaseError(current)) {
      return current;
    }
    visited.add(current);
    current = current.cause;
  }
  return undefined;
}