package database

import (
	"database/sql"
	"github.com/gogf/gf/database/gdb"
	"github.com/gogf/gf/errors/gcode"
	"github.com/gogf/gf/errors/gerror"
	"github.com/gogf/gf/text/gregex"
	"github.com/gogf/gf/util/gconv"
	gora "github.com/sijms/go-ora/v2"
)

type OracleDriver struct {
	*gdb.DriverOracle
}

var (
	// customDriverName is my driver name, which is used for registering.
	customDriverName = "oracle"
)

func init() {
	// It here registers my custom driver in package initialization function "init".
	// You can later use this type in the database configuration.
	if err := gdb.Register(customDriverName, &OracleDriver{}); err != nil {
		panic(err)
	}
}

// New creates and returns a database object for oracle.
// It implements the interface of gdb.Driver for extra database driver installation.
func (d *OracleDriver) New(core *gdb.Core, node *gdb.ConfigNode) (gdb.DB, error) {
	return &OracleDriver{
		&gdb.DriverOracle{
			Core: core,
		},
	}, nil
}

// Open creates and returns an underlying sql.DB object for oracle.
func (d *OracleDriver) Open(config *gdb.ConfigNode) (db *sql.DB, err error) {
	var (
		source               string
		underlyingDriverName = "oracle"
	)

	options := map[string]string{
		"CONNECTION TIMEOUT": "60",
		"PREFETCH_ROWS":      "25",
	}

	if config.Debug {
		options["TRACE FILE"] = "oracle_trace.log"
	}
	// [username:[password]@]host[:port][/service_name][?param1=value1&...&paramN=valueN]
	if config.Link != "" {
		// ============================================================================
		// Deprecated from v2.2.0.
		// ============================================================================
		source = config.Link
		// Custom changing the schema in runtime.
		if config.Name != "" {
			source, _ = gregex.ReplaceString(`@(.+?)/([\w\.\-]+)+`, "@$1/"+config.Name, source)
		}
	} else {
		source = gora.BuildUrl(
			config.Host, gconv.Int(config.Port), config.Name, config.User, config.Pass, options,
		)
	}

	if db, err = sql.Open(underlyingDriverName, source); err != nil {
		err = gerror.WrapCodef(
			gcode.CodeDbOperationError, err,
			`sql.Open failed for driver "%s" by source "%s"`, underlyingDriverName, source,
		)
		return nil, err
	}
	return
}