// Copyright 2017 gf Author(https://github.com/gogf/gf). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.

package gdb

import (
	"database/sql"
	"errors"
)

// Update does "UPDATE ... " statement for the model.
//
// If the optional parameter <dataAndWhere> is given, the dataAndWhere[0] is the updated data field,
// and dataAndWhere[1:] is treated as where condition fields.
// Also see Model.Data and Model.Where functions.
func (m *Model) Update(dataAndWhere ...interface{}) (result sql.Result, err error) {
	if len(dataAndWhere) > 0 {
		if len(dataAndWhere) > 2 {
			return m.Data(dataAndWhere[0]).Where(dataAndWhere[1], dataAndWhere[2:]...).Update()
		} else if len(dataAndWhere) == 2 {
			return m.Data(dataAndWhere[0]).Where(dataAndWhere[1]).Update()
		} else {
			return m.Data(dataAndWhere[0]).Update()
		}
	}
	defer func() {
		if err == nil {
			m.checkAndRemoveCache()
		}
	}()
	if m.data == nil {
		return nil, errors.New("updating table with empty data")
	}
	condition, conditionArgs := m.formatCondition(false)
	return m.db.DoUpdate(
		m.getLink(true),
		m.tables,
		m.filterDataForInsertOrUpdate(m.data),
		condition,
		m.mergeArguments(conditionArgs)...,
	)
}