// +build !future

/*
Copyright 2014 SAP SE

Licensed 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 driver

import (
	"database/sql"
	"fmt"
	"testing"
)

const (
	bulkSamples = 10000
)

// TestBulkFrame
func testBulkFrame(db *sql.DB, cmd string, insertFct func(stmt *sql.Stmt), t *testing.T) {

	// 1. prepare
	tmpTableName := RandomIdentifier("#tmpTable")

	//keep connection / hdb session for using local temporary tables
	tx, err := db.Begin()
	if err != nil {
		t.Fatal(err)
	}
	defer tx.Rollback() //cleanup

	if _, err := tx.Exec(fmt.Sprintf("create local temporary table %s (i integer)", tmpTableName)); err != nil {
		t.Fatalf("create table failed: %s", err)
	}

	stmt, err := tx.Prepare(fmt.Sprintf("%s %s values (?)", cmd, tmpTableName))
	if err != nil {
		t.Fatalf("prepare bulk insert failed: %s", err)
	}
	defer stmt.Close()

	// 2. call insert function
	insertFct(stmt)

	// 3. check
	i := 0
	err = tx.QueryRow(fmt.Sprintf("select count(*) from %s", tmpTableName)).Scan(&i)
	if err != nil {
		t.Fatalf("select count failed: %s", err)
	}

	if i != bulkSamples {
		t.Fatalf("invalid number of records %d - %d expected", i, bulkSamples)
	}

	rows, err := tx.Query(fmt.Sprintf("select * from %s order by i", tmpTableName))
	if err != nil {
		t.Fatal(err)
	}
	defer rows.Close()

	i = 0
	for rows.Next() {

		var j int

		if err := rows.Scan(&j); err != nil {
			t.Fatal(err)
		}

		if j != i {
			t.Fatalf("value %d - expected %d", j, i)
		}

		i++
	}
	if err := rows.Err(); err != nil {
		t.Fatal(err)
	}
}

// TestBulkInsertDuplicates
func testBulkInsertDuplicates(db *sql.DB, t *testing.T) {

	table := RandomIdentifier("bulkInsertDuplicates")

	if _, err := db.Exec(fmt.Sprintf("create table %s (k integer primary key, v integer)", table)); err != nil {
		t.Fatalf("create table failed: %s", err)
	}

	stmt, err := db.Prepare(fmt.Sprintf("bulk insert into %s values (?,?)", table))
	if err != nil {
		t.Fatalf("prepare bulk insert failed: %s", err)
	}
	defer stmt.Close()

	for i := 1; i < 4; i++ {
		if _, err := stmt.Exec(i, i); err != nil {
			t.Fatalf("insert failed: %s", err)
		}
	}
	if _, err := stmt.Exec(); err != nil {
		t.Fatalf("final insert (flush) failed: %s", err)
	}

	for i := 0; i < 5; i++ {
		if _, err := stmt.Exec(i, i); err != nil {
			t.Fatalf("insert failed: %s", err)
		}
	}
	_, err = stmt.Exec()
	if err == nil {
		t.Fatal("error duplicate key expected")
	}

	dbError, ok := err.(Error)
	if !ok {
		t.Fatal("driver.Error expected")
	}

	// expect 3 errors for statement 1,2 and 3
	if dbError.NumError() != 3 {
		t.Fatalf("number of errors: %d - %d expected", dbError.NumError(), 3)
	}

	stmtNo := []int{1, 2, 3}

	for i := 0; i < dbError.NumError(); i++ {
		dbError.SetIdx(i)
		if dbError.StmtNo() != stmtNo[i] {
			t.Fatalf("statement number: %d - %d expected", dbError.StmtNo(), stmtNo[i])
		}
	}
}

func testBulk(db *sql.DB, t *testing.T) {
	tests := []struct {
		name      string
		cmd       string
		insertFct func(stmt *sql.Stmt)
	}{
		{
			"bulkInsertViaCommand",
			"bulk insert into",
			func(stmt *sql.Stmt) {
				for i := 0; i < bulkSamples; i++ {
					if _, err := stmt.Exec(i); err != nil {
						t.Fatalf("insert failed: %s", err)
					}
				}
				// final flush
				if _, err := stmt.Exec(); err != nil {
					t.Fatalf("final insert (flush) failed: %s", err)
				}
			},
		},
		{
			"bulkInsertViaParameter",
			"insert into",
			func(stmt *sql.Stmt) {
				prm := NoFlush
				for i := 0; i < bulkSamples; i++ {
					if i == (bulkSamples - 1) {
						prm = Flush
					}
					if _, err := stmt.Exec(i, prm); err != nil {
						t.Fatalf("insert failed: %s", err)
					}
				}
			},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			testBulkFrame(db, test.cmd, test.insertFct, t)
		})
	}
}

func TestBulk(t *testing.T) {
	tests := []struct {
		name string
		fct  func(db *sql.DB, t *testing.T)
	}{
		{"testBulk", testBulk},
		{"testBulkInsertDuplicates", testBulkInsertDuplicates},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			test.fct(TestDB, t)
		})
	}
}