/* eslint max-len: 0 */

// Redshift Table Builder & Compiler
// -------

import inherits from 'inherits';
import { has } from 'lodash';
import TableCompiler_PG from '../../postgres/schema/tablecompiler';

function TableCompiler_Redshift() {
  TableCompiler_PG.apply(this, arguments);
}
inherits(TableCompiler_Redshift, TableCompiler_PG);

TableCompiler_Redshift.prototype.index = function(columns, indexName, indexType) {
  this.client.logger.warn('Redshift does not support the creation of indexes.');
};

TableCompiler_Redshift.prototype.dropIndex = function(columns, indexName) {
  this.client.logger.warn('Redshift does not support the deletion of indexes.');
};

// TODO: have to disable setting not null on columns that already exist...

// Adds the "create" query to the query sequence.
TableCompiler_Redshift.prototype.createQuery = function(columns, ifNot) {
  const createStatement = ifNot ? 'create table if not exists ' : 'create table ';
  let sql = createStatement + this.tableName() + ' (' + columns.sql.join(', ') + ')';
  if (this.single.inherits) sql += ` like (${this.formatter.wrap(this.single.inherits)})`;
  this.pushQuery({
    sql,
    bindings: columns.bindings
  });
  const hasComment = has(this.single, 'comment');
  if (hasComment) this.comment(this.single.comment);
};

TableCompiler_Redshift.prototype.primary = function(columns, constraintName) {
  const self = this;
  constraintName = constraintName ? self.formatter.wrap(constraintName) : self.formatter.wrap(`${this.tableNameRaw}_pkey`);
  if (columns.constructor !== Array){
    columns = [columns];
  }
  const thiscolumns = self.grouped.columns;

  if (thiscolumns) {
    for (let i = 0; i < columns.length; i++){
      let exists = thiscolumns.find(tcb => tcb.grouping === "columns" &&
        tcb.builder &&
        tcb.builder._method === "add" &&
        tcb.builder._args &&
        tcb.builder._args.indexOf(columns[i]) > -1);
      if (exists) {
        exists = exists.builder;
      }
      const nullable = !(exists &&
        exists._modifiers &&
        exists._modifiers["nullable"] &&
        exists._modifiers["nullable"][0] === false);
      if (nullable){
        if (exists){
          return this.client.logger.warn("Redshift does not allow primary keys to contain nullable columns.");
        } else {
          return this.client.logger.warn("Redshift does not allow primary keys to contain nonexistent columns.");
        }
      }
    }
  }
  return self.pushQuery(`alter table ${self.tableName()} add constraint ${constraintName} primary key (${self.formatter.columnize(columns)})`);
};

// Compiles column add. Redshift can only add one column per ALTER TABLE, so core addColumns doesn't work.  #2545
TableCompiler_Redshift.prototype.addColumns = function (columns, prefix, colCompilers) {
  if (prefix === this.alterColumnsPrefix) {
    TableCompiler_PG.prototype.addColumns.call(this, columns, prefix, colCompilers);
  } else {
    prefix = prefix || this.addColumnsPrefix;
    colCompilers = colCompilers || this.getColumns();
    for (const col  of colCompilers) {
      const quotedTableName = this.tableName();
      const colCompiled = col.compileColumn();

      this.pushQuery({
        sql: `alter table ${quotedTableName} ${prefix}${colCompiled}`,
        bindings: []
      });
    }
  }
};

export default TableCompiler_Redshift;