/* eslint max-len: 0 */

// PostgreSQL Table Builder & Compiler
// -------

import inherits from 'inherits';
import TableCompiler from '../../../schema/tablecompiler';

import { has } from 'lodash'

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

// Compile a rename column command.
TableCompiler_PG.prototype.renameColumn = function(from, to) {
  return this.pushQuery({
    sql: `alter table ${this.tableName()} rename ${this.formatter.wrap(from)} to ${this.formatter.wrap(to)}`
  });
};

TableCompiler_PG.prototype.compileAdd = function(builder) {
  const table = this.formatter.wrap(builder);
  const columns = this.prefixArray('add column', this.getColumns(builder));
  return this.pushQuery({
    sql: `alter table ${table} ${columns.join(', ')}`
  });
};

// Adds the "create" query to the query sequence.
TableCompiler_PG.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 += ` inherits (${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_PG.prototype.addColumns = function(columns, prefix, colCompilers) {
  if (prefix === this.alterColumnsPrefix) {
    // alter columns
    for (const col  of colCompilers) {
      const quotedTableName = this.tableName();
      const colName = col.getColumnName();
      const type = col.getColumnType();

      this.pushQuery({
        sql: `alter table ${quotedTableName} alter column "${colName}" drop default`,
        bindings: []
      });
      this.pushQuery({
        sql: `alter table ${quotedTableName} alter column "${colName}" drop not null`,
        bindings: []
      });
      this.pushQuery({
        sql: `alter table ${quotedTableName} alter column "${colName}" type ${type} using ("${colName}"::${type})`,
        bindings: []
      });

      const defaultTo = col.modified['defaultTo'];
      if (defaultTo) {
        const modifier = col.defaultTo.apply(col, defaultTo);
        this.pushQuery({
          sql: `alter table ${quotedTableName} alter column "${colName}" set ${modifier}`,
          bindings: []
        });
      }

      const nullable = col.modified['nullable'];
      if (nullable && nullable[0] === false) {
        this.pushQuery({
          sql: `alter table ${quotedTableName} alter column "${colName}" set not null`,
          bindings: []
        });
      }
    }
  } else {
    // base class implementation for normal add
    TableCompiler.prototype.addColumns.call(this, columns, prefix);
  }
};

// Compiles the comment on the table.
TableCompiler_PG.prototype.comment = function(comment) {
  this.pushQuery(`comment on table ${this.tableName()} is '${this.single.comment}'`);
};

// Indexes:
// -------

TableCompiler_PG.prototype.primary = function(columns, constraintName) {
  constraintName = constraintName ? this.formatter.wrap(constraintName) : this.formatter.wrap(`${this.tableNameRaw}_pkey`);
  this.pushQuery(`alter table ${this.tableName()} add constraint ${constraintName} primary key (${this.formatter.columnize(columns)})`);
};
TableCompiler_PG.prototype.unique = function(columns, indexName) {
  indexName = indexName ? this.formatter.wrap(indexName) : this._indexCommand('unique', this.tableNameRaw, columns);
  this.pushQuery(`alter table ${this.tableName()} add constraint ${indexName}` +
    ' unique (' + this.formatter.columnize(columns) + ')');
};
TableCompiler_PG.prototype.index = function(columns, indexName, indexType) {
  indexName = indexName ? this.formatter.wrap(indexName) : this._indexCommand('index', this.tableNameRaw, columns);
  this.pushQuery(`create index ${indexName} on ${this.tableName()}${indexType && (` using ${indexType}`) || ''}` +
    ' (' + this.formatter.columnize(columns) + ')');
};
TableCompiler_PG.prototype.dropPrimary = function(constraintName) {
  constraintName = constraintName ? this.formatter.wrap(constraintName) : this.formatter.wrap(this.tableNameRaw + '_pkey');
  this.pushQuery(`alter table ${this.tableName()} drop constraint ${constraintName}`);
};
TableCompiler_PG.prototype.dropIndex = function(columns, indexName) {
  indexName = indexName ? this.formatter.wrap(indexName) : this._indexCommand('index', this.tableNameRaw, columns);
  indexName = this.schemaNameRaw ? `${this.formatter.wrap(this.schemaNameRaw)}.${indexName}` : indexName;
  this.pushQuery(`drop index ${indexName}`);
};
TableCompiler_PG.prototype.dropUnique = function(columns, indexName) {
  indexName = indexName ? this.formatter.wrap(indexName) : this._indexCommand('unique', this.tableNameRaw, columns);
  this.pushQuery(`alter table ${this.tableName()} drop constraint ${indexName}`);
};
TableCompiler_PG.prototype.dropForeign = function(columns, indexName) {
  indexName = indexName ? this.formatter.wrap(indexName) : this._indexCommand('foreign', this.tableNameRaw, columns);
  this.pushQuery(`alter table ${this.tableName()} drop constraint ${indexName}`);
};

export default TableCompiler_PG;