/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package sql

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

	"github.com/seata/seata-go/pkg/datasource/sql/exec"
	"github.com/seata/seata-go/pkg/datasource/sql/types"
)

type Stmt struct {
	conn *Conn
	// res
	res *DBResource
	// txCtx
	txCtx *types.TransactionContext
	// query
	query string
	// stmt
	stmt driver.Stmt
}

// Close closes the statement.
//
// As of Go 1.1, a Stmt will not be closed if it's in use
// by any queries.
//
// Drivers must ensure all network calls made by Close
// do not block indefinitely (e.g. apply a timeout).
func (s *Stmt) Close() error {
	s.txCtx = nil
	return s.stmt.Close()
}

// NumInput returns the number of placeholder parameters.
//
// If NumInput returns >= 0, the sql package will sanity check
// argument counts from callers and return errors to the caller
// before the statement's Exec or Query methods are called.
//
// NumInput may also return -1, if the driver doesn't know
// its number of placeholders. In that case, the sql package
// will not sanity check Exec or Query argument counts.
func (s *Stmt) NumInput() int {
	return s.stmt.NumInput()
}

// Query executes a query that may return rows, such as a
// SELECT.
//
// Deprecated: Drivers should implement StmtQueryContext instead (or additionally).
func (s *Stmt) Query(args []driver.Value) (driver.Rows, error) {
	executor, err := exec.BuildExecutor(s.res.dbType, s.txCtx.TransType, s.query)
	if err != nil {
		return nil, err
	}

	execCtx := &exec.ExecContext{
		TxCtx:  s.txCtx,
		Query:  s.query,
		Values: args,
	}

	ret, err := executor.ExecWithValue(context.Background(), execCtx,
		func(ctx context.Context, query string, args []driver.Value) (types.ExecResult, error) {
			ret, err := s.stmt.Query(args)
			if err != nil {
				return nil, err
			}

			return types.NewResult(types.WithRows(ret)), nil
		})
	if err != nil {
		return nil, err
	}

	return ret.GetRows(), nil
}

// StmtQueryContext enhances the Stmt interface by providing Query with context.
// QueryContext executes a query that may return rows, such as a
// SELECT.
//
// QueryContext must honor the context timeout and return when it is canceled.
func (s *Stmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
	stmt, ok := s.stmt.(driver.StmtQueryContext)
	if !ok {
		return nil, driver.ErrSkip
	}

	executor, err := exec.BuildExecutor(s.res.dbType, s.txCtx.TransType, s.query)
	if err != nil {
		return nil, err
	}

	execCtx := &exec.ExecContext{
		TxCtx:       s.txCtx,
		Query:       s.query,
		NamedValues: args,
	}

	ret, err := executor.ExecWithNamedValue(context.Background(), execCtx,
		func(ctx context.Context, query string, args []driver.NamedValue) (types.ExecResult, error) {
			ret, err := stmt.QueryContext(ctx, args)
			if err != nil {
				return nil, err
			}

			return types.NewResult(types.WithRows(ret)), nil
		})
	if err != nil {
		return nil, err
	}

	return ret.GetRows(), nil
}

// Exec executes a query that doesn't return rows, such
// as an INSERT or UPDATE.
//
// Deprecated: Drivers should implement StmtExecContext instead (or additionally).
func (s *Stmt) Exec(args []driver.Value) (driver.Result, error) {
	// in transaction, need run Executor
	executor, err := exec.BuildExecutor(s.res.dbType, s.txCtx.TransType, s.query)
	if err != nil {
		return nil, err
	}

	execCtx := &exec.ExecContext{
		TxCtx:  s.txCtx,
		Query:  s.query,
		Values: args,
	}

	ret, err := executor.ExecWithValue(context.Background(), execCtx,
		func(ctx context.Context, query string, args []driver.Value) (types.ExecResult, error) {
			ret, err := s.stmt.Exec(args)
			if err != nil {
				return nil, err
			}

			return types.NewResult(types.WithResult(ret)), nil
		})

	return ret.GetResult(), err
}

// ExecContext executes a query that doesn't return rows, such
// as an INSERT or UPDATE.
//
// ExecContext must honor the context timeout and return when it is canceled.
func (s *Stmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
	stmt, ok := s.stmt.(driver.StmtExecContext)
	if !ok {
		return nil, driver.ErrSkip
	}

	// in transaction, need run Executor
	executor, err := exec.BuildExecutor(s.res.dbType, s.txCtx.TransType, s.query)
	if err != nil {
		return nil, err
	}

	execCtx := &exec.ExecContext{
		TxCtx:       s.txCtx,
		Query:       s.query,
		NamedValues: args,
	}

	ret, err := executor.ExecWithNamedValue(ctx, execCtx,
		func(ctx context.Context, query string, args []driver.NamedValue) (types.ExecResult, error) {
			ret, err := stmt.ExecContext(ctx, args)
			if err != nil {
				return nil, err
			}

			return types.NewResult(types.WithResult(ret)), nil
		})

	return ret.GetResult(), err
}