// Package sqladapter provides common logic for SQL adapters.
package sqladapter

import (
	"database/sql"
	"database/sql/driver"

	"git.hexq.cn/tiglog/mydb"
	"git.hexq.cn/tiglog/mydb/internal/sqlbuilder"
)

// IsKeyValue reports whether v is a valid value for a primary key that can be
// used with Find(pKey).
func IsKeyValue(v interface{}) bool {
	if v == nil {
		return true
	}
	switch v.(type) {
	case int64, int, uint, uint64,
		[]int64, []int, []uint, []uint64,
		[]byte, []string,
		[]interface{},
		driver.Valuer:
		return true
	}
	return false
}

type sqlAdapterWrapper struct {
	adapter AdapterSession
}

func (w *sqlAdapterWrapper) OpenDSN(dsn mydb.ConnectionURL) (mydb.Session, error) {
	sess := NewSession(dsn, w.adapter)
	if err := sess.Open(); err != nil {
		return nil, err
	}
	return sess, nil
}

func (w *sqlAdapterWrapper) NewTx(sqlTx *sql.Tx) (sqlbuilder.Tx, error) {
	tx, err := NewTx(w.adapter, sqlTx)
	if err != nil {
		return nil, err
	}
	return tx, nil
}

func (w *sqlAdapterWrapper) New(sqlDB *sql.DB) (mydb.Session, error) {
	sess := NewSession(nil, w.adapter)
	if err := sess.BindDB(sqlDB); err != nil {
		return nil, err
	}
	return sess, nil
}

// RegisterAdapter registers a new SQL adapter.
func RegisterAdapter(name string, adapter AdapterSession) sqlbuilder.Adapter {
	z := &sqlAdapterWrapper{adapter}
	mydb.RegisterAdapter(name, sqlbuilder.NewCompatAdapter(z))
	return z
}