import { SqlDumper } from '@dbgate/types';
import { Command, Select } from './types';
import { dumpSqlExpression } from './dumpSqlExpression';
import { dumpSqlFromDefinition } from './dumpSqlSource';
import { dumpSqlCondition } from './dumpSqlCondition';

export function dumpSqlSelect(dmp: SqlDumper, select: Select) {
  dmp.put('^select ');
  if (select.topRecords) {
    dmp.put('^top %s ', select.topRecords);
  }
  if (select.distinct) {
    dmp.put('^distinct ');
  }
  if (select.selectAll) {
    dmp.put('* ');
  }
  if (select.columns) {
    if (select.selectAll) dmp.put('&n,');
    dmp.put('&>&n');
    dmp.putCollection(',&n', select.columns, fld => {
      dumpSqlExpression(dmp, fld);
      if (fld.alias) dmp.put(' ^as %i', fld.alias);
    });
    dmp.put('&n&<');
  }
  dmp.put('^from ');
  dumpSqlFromDefinition(dmp, select.from);
  if (select.where) {
    dmp.put('&n^where ');
    dumpSqlCondition(dmp, select.where);
    dmp.put('&n');
  }
  if (select.groupBy) {
    dmp.put('&n^group ^by ');
    dmp.putCollection(', ', select.groupBy, expr => dumpSqlExpression(dmp, expr));
    dmp.put('&n');
  }
  if (select.orderBy) {
    dmp.put('&n^order ^by ');
    dmp.putCollection(', ', select.orderBy, expr => {
      dumpSqlExpression(dmp, expr);
      dmp.put(' %k', expr.direction);
    });
    dmp.put('&n');
  }
  if (select.range) {
    if (dmp.dialect.offsetFetchRangeSyntax) {
      dmp.put('^offset %s ^rows ^fetch ^next %s ^rows ^only', select.range.offset, select.range.limit);
    } else {
      dmp.put('^limit %s ^offset %s ', select.range.limit, select.range.offset);
    }
  }
}

export function dumpSqlCommand(dmp: SqlDumper, command: Command) {
  switch (command.commandType) {
    case 'select':
      dumpSqlSelect(dmp, command);
      break;
  }
}