import type { ListAuditQueryDto } from './dto/list-audit-query.dto';

export interface AuditFilters {
  clause: string;
  parameters: unknown[];
}

export function buildAuditFilters(query: ListAuditQueryDto): AuditFilters {
  const conditions: string[] = [];
  const parameters: unknown[] = [];

  const add = (condition: (parameter: string) => string, value: unknown) => {
    parameters.push(value);
    conditions.push(condition(`$${parameters.length}`));
  };

  if (query.actorUserId) {
    add((parameter) => `event.actor_user_id = ${parameter}`, query.actorUserId);
  }
  if (query.actorUsername) {
    add(
      (parameter) => `event.actor_username ILIKE ${parameter}`,
      `%${query.actorUsername}%`,
    );
  }
  if (query.action) {
    add((parameter) => `event.action = ${parameter}`, query.action);
  }
  if (query.source) {
    add((parameter) => `event.source = ${parameter}`, query.source);
  }
  if (query.entityType) {
    add((parameter) => `event.entity_type = ${parameter}`, query.entityType);
  }
  if (query.entityId) {
    add((parameter) => `event.entity_id = ${parameter}`, query.entityId);
  }
  if (query.requestId) {
    add((parameter) => `event.request_id = ${parameter}`, query.requestId);
  }
  if (query.from) {
    add((parameter) => `event.occurred_at >= ${parameter}`, new Date(query.from));
  }
  if (query.to) {
    add((parameter) => `event.occurred_at <= ${parameter}`, new Date(query.to));
  }
  if (query.search) {
    add(
      (parameter) => `
        (
          event.actor_username ILIKE ${parameter}
          OR event.action ILIKE ${parameter}
          OR event.entity_type ILIKE ${parameter}
          OR event.entity_id ILIKE ${parameter}
          OR event.request_id ILIKE ${parameter}
        )
      `,
      `%${query.search}%`,
    );
  }

  return {
    clause: conditions.length > 0 ? `WHERE ${conditions.join(' AND ')}` : '',
    parameters,
  };
}