// Copyright 2016 Documize Inc. <legal@documize.com>. All rights reserved.
//
// This software (Documize Community Edition) is licensed under
// GNU AGPL v3 http://www.gnu.org/licenses/agpl-3.0.en.html
//
// You can operate outside the AGPL restrictions by purchasing
// Documize Enterprise Edition and obtaining a commercial license
// by contacting <sales@documize.com>.
//
// https://documize.com

package request

import (
	"fmt"
	// "os"
	// "strings"
	// "time"

	"github.com/jmoiron/sqlx"
	// "github.com/documize/community/core/database"
	// "github.com/documize/community/core/env"
	"github.com/documize/community/core/log"
	"github.com/documize/community/core/streamutil"
	// "github.com/documize/community/core/web"
)

var connectionString string

// Db is the central connection to the database, used by all database requests.
var Db *sqlx.DB

var searches *SearchManager

type databaseRequest struct {
	Transaction *sqlx.Tx
	OrgID       string
}

func (dr *databaseRequest) MakeTx() (err error) {
	if dr.Transaction != nil {
		return nil
	}
	dr.Transaction, err = Db.Beginx()
	return err
}

// func init() {
// 	var err error

// 	env.GetString(&connectionString, "db", true,
// 		`'username:password@protocol(hostname:port)/databasename" for example "fred:bloggs@tcp(localhost:3306)/documize"`,
// 		func(*string, string) bool {

// 			Db, err = sqlx.Open("mysql", stdConn(connectionString))

// 			if err != nil {
// 				log.Error("Unable to setup database", err)
// 			}

// 			Db.SetMaxIdleConns(30)
// 			Db.SetMaxOpenConns(100)
// 			Db.SetConnMaxLifetime(time.Second * 14400)

// 			err = Db.Ping()

// 			if err != nil {
// 				log.Error("Unable to connect to database, connection string should be of the form: '"+
// 					"username:password@tcp(host:3306)/database'", err)
// 				os.Exit(2)
// 			}

// 			// go into setup mode if required
// 			if web.SiteMode != web.SiteModeOffline {
// 				if database.Check(Db, connectionString) {
// 					if err := database.Migrate(true /* the config table exists */); err != nil {
// 						log.Error("Unable to run database migration: ", err)
// 						os.Exit(2)
// 					}
// 				} else {
// 					log.Info("database.Check(Db) !OK, going into setup mode")
// 				}
// 			}

// 			return false // value not changed
// 		})
// }

// var stdParams = map[string]string{
// 	"charset":          "utf8",
// 	"parseTime":        "True",
// 	"maxAllowedPacket": "4194304", // 4194304 // 16777216 = 16MB
// }

// func stdConn(cs string) string {
// 	queryBits := strings.Split(cs, "?")
// 	ret := queryBits[0] + "?"
// 	retFirst := true
// 	if len(queryBits) == 2 {
// 		paramBits := strings.Split(queryBits[1], "&")
// 		for _, pb := range paramBits {
// 			found := false
// 			if assignBits := strings.Split(pb, "="); len(assignBits) == 2 {
// 				_, found = stdParams[strings.TrimSpace(assignBits[0])]
// 			}
// 			if !found { // if we can't work out what it is, put it through
// 				if retFirst {
// 					retFirst = false
// 				} else {
// 					ret += "&"
// 				}
// 				ret += pb
// 			}
// 		}
// 	}
// 	for k, v := range stdParams {
// 		if retFirst {
// 			retFirst = false
// 		} else {
// 			ret += "&"
// 		}
// 		ret += k + "=" + v
// 	}
// 	return ret
// }

type baseManager struct {
}

func (m *baseManager) Delete(tx *sqlx.Tx, table string, id string) (rows int64, err error) {
	stmt, err := tx.Preparex("DELETE FROM " + table + " WHERE refid=?")
	if err != nil {
		log.Error(fmt.Sprintf("Unable to prepare delete of row in table %s", table), err)
		return
	}
	defer streamutil.Close(stmt)

	result, err := stmt.Exec(id)

	if err != nil {
		log.Error(fmt.Sprintf("Unable to delete row in table %s", table), err)
		return
	}

	rows, err = result.RowsAffected()

	return
}

func (m *baseManager) DeleteConstrained(tx *sqlx.Tx, table string, orgID, id string) (rows int64, err error) {
	stmt, err := tx.Preparex("DELETE FROM " + table + " WHERE orgid=? AND refid=?")
	if err != nil {
		log.Error(fmt.Sprintf("Unable to prepare constrained delete of row in table %s", table), err)
		return
	}
	defer streamutil.Close(stmt)

	result, err := stmt.Exec(orgID, id)

	if err != nil {
		log.Error(fmt.Sprintf("Unable to delete row in table %s", table), err)
		return
	}

	rows, err = result.RowsAffected()

	return
}

func (m *baseManager) DeleteConstrainedWithID(tx *sqlx.Tx, table string, orgID, id string) (rows int64, err error) {
	stmt, err := tx.Preparex("DELETE FROM " + table + " WHERE orgid=? AND id=?")
	if err != nil {
		log.Error(fmt.Sprintf("Unable to prepare ConstrainedWithID delete of row in table %s", table), err)
		return
	}
	defer streamutil.Close(stmt)

	result, err := stmt.Exec(orgID, id)

	if err != nil {
		log.Error(fmt.Sprintf("Unable to delete row in table %s", table), err)
		return
	}

	rows, err = result.RowsAffected()

	return
}

func (m *baseManager) DeleteWhere(tx *sqlx.Tx, statement string) (rows int64, err error) {
	result, err := tx.Exec(statement)

	if err != nil {
		log.Error(fmt.Sprintf("Unable to delete rows: %s", statement), err)
		return
	}

	rows, err = result.RowsAffected()

	return
}

// SQLPrepareError returns a string detailing the location of the error.
func (m *baseManager) SQLPrepareError(method string, id string) string {
	return fmt.Sprintf("Unable to prepare SQL for %s, ID %s", method, id)
}

// SQLSelectError returns a string detailing the location of the error.
func (m *baseManager) SQLSelectError(method string, id string) string {
	return fmt.Sprintf("Unable to execute SQL for %s, ID %s", method, id)
}