<?php

namespace Doctrine\DBAL\Tests\Platforms;

use Doctrine\DBAL\Exception;
use Doctrine\DBAL\Platforms\AbstractPlatform;
use Doctrine\DBAL\Platforms\SqlitePlatform;
use Doctrine\DBAL\Schema\Column;
use Doctrine\DBAL\Schema\Table;
use Doctrine\DBAL\Schema\TableDiff;
use Doctrine\DBAL\TransactionIsolationLevel;
use Doctrine\DBAL\Types\Type;

/** @extends AbstractPlatformTestCase<SqlitePlatform> */
class SqlitePlatformTest extends AbstractPlatformTestCase
{
    public function createPlatform(): AbstractPlatform
    {
        return new SqlitePlatform();
    }

    public function getGenerateTableSql(): string
    {
        return 'CREATE TABLE test (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, test VARCHAR(255) DEFAULT NULL)';
    }

    /**
     * {@inheritDoc}
     */
    public function getGenerateTableWithMultiColumnUniqueIndexSql(): array
    {
        return [
            'CREATE TABLE test (foo VARCHAR(255) DEFAULT NULL, bar VARCHAR(255) DEFAULT NULL)',
            'CREATE UNIQUE INDEX UNIQ_D87F7E0C8C73652176FF8CAA ON test (foo, bar)',
        ];
    }

    public function testGeneratesSqlSnippets(): void
    {
        self::assertEquals('REGEXP', $this->platform->getRegexpExpression());
        self::assertEquals('SUBSTR(column, 5, LENGTH(column))', $this->platform->getSubstringExpression('column', 5));
        self::assertEquals('SUBSTR(column, 0, 5)', $this->platform->getSubstringExpression('column', 0, 5));
    }

    public function testGeneratesTransactionCommands(): void
    {
        self::assertEquals(
            'PRAGMA read_uncommitted = 0',
            $this->platform->getSetTransactionIsolationSQL(TransactionIsolationLevel::READ_UNCOMMITTED),
        );
        self::assertEquals(
            'PRAGMA read_uncommitted = 1',
            $this->platform->getSetTransactionIsolationSQL(TransactionIsolationLevel::READ_COMMITTED),
        );
        self::assertEquals(
            'PRAGMA read_uncommitted = 1',
            $this->platform->getSetTransactionIsolationSQL(TransactionIsolationLevel::REPEATABLE_READ),
        );
        self::assertEquals(
            'PRAGMA read_uncommitted = 1',
            $this->platform->getSetTransactionIsolationSQL(TransactionIsolationLevel::SERIALIZABLE),
        );
    }

    public function testPrefersIdentityColumns(): void
    {
        self::assertTrue($this->platform->prefersIdentityColumns());
    }

    public function testIgnoresUnsignedIntegerDeclarationForAutoIncrementalIntegers(): void
    {
        self::assertSame(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getIntegerTypeDeclarationSQL(['autoincrement' => true, 'unsigned' => true]),
        );
    }

    public function testGeneratesTypeDeclarationForTinyIntegers(): void
    {
        self::assertEquals(
            'TINYINT',
            $this->platform->getTinyIntTypeDeclarationSQL([]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getTinyIntTypeDeclarationSQL(['autoincrement' => true]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getTinyIntTypeDeclarationSQL(
                ['autoincrement' => true, 'primary' => true],
            ),
        );
        self::assertEquals(
            'TINYINT',
            $this->platform->getTinyIntTypeDeclarationSQL(['unsigned' => false]),
        );
        self::assertEquals(
            'TINYINT UNSIGNED',
            $this->platform->getTinyIntTypeDeclarationSQL(['unsigned' => true]),
        );
    }

    public function testGeneratesTypeDeclarationForSmallIntegers(): void
    {
        self::assertEquals(
            'SMALLINT',
            $this->platform->getSmallIntTypeDeclarationSQL([]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getSmallIntTypeDeclarationSQL(['autoincrement' => true]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getTinyIntTypeDeclarationSQL(['autoincrement' => true, 'unsigned' => true]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getSmallIntTypeDeclarationSQL(
                ['autoincrement' => true, 'primary' => true],
            ),
        );
        self::assertEquals(
            'SMALLINT',
            $this->platform->getSmallIntTypeDeclarationSQL(['unsigned' => false]),
        );
        self::assertEquals(
            'SMALLINT UNSIGNED',
            $this->platform->getSmallIntTypeDeclarationSQL(['unsigned' => true]),
        );
    }

    public function testGeneratesTypeDeclarationForMediumIntegers(): void
    {
        self::assertEquals(
            'MEDIUMINT',
            $this->platform->getMediumIntTypeDeclarationSQL([]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getMediumIntTypeDeclarationSQL(['autoincrement' => true]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getMediumIntTypeDeclarationSQL(['autoincrement' => true, 'unsigned' => true]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getMediumIntTypeDeclarationSQL(
                ['autoincrement' => true, 'primary' => true],
            ),
        );
        self::assertEquals(
            'MEDIUMINT',
            $this->platform->getMediumIntTypeDeclarationSQL(['unsigned' => false]),
        );
        self::assertEquals(
            'MEDIUMINT UNSIGNED',
            $this->platform->getMediumIntTypeDeclarationSQL(['unsigned' => true]),
        );
    }

    public function testGeneratesTypeDeclarationForIntegers(): void
    {
        self::assertEquals(
            'INTEGER',
            $this->platform->getIntegerTypeDeclarationSQL([]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getIntegerTypeDeclarationSQL(['autoincrement' => true]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getIntegerTypeDeclarationSQL(['autoincrement' => true, 'unsigned' => true]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getIntegerTypeDeclarationSQL(
                ['autoincrement' => true, 'primary' => true],
            ),
        );
        self::assertEquals(
            'INTEGER',
            $this->platform->getIntegerTypeDeclarationSQL(['unsigned' => false]),
        );
        self::assertEquals(
            'INTEGER UNSIGNED',
            $this->platform->getIntegerTypeDeclarationSQL(['unsigned' => true]),
        );
    }

    public function testGeneratesTypeDeclarationForBigIntegers(): void
    {
        self::assertEquals(
            'BIGINT',
            $this->platform->getBigIntTypeDeclarationSQL([]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getBigIntTypeDeclarationSQL(['autoincrement' => true]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getBigIntTypeDeclarationSQL(['autoincrement' => true, 'unsigned' => true]),
        );
        self::assertEquals(
            'INTEGER PRIMARY KEY AUTOINCREMENT',
            $this->platform->getBigIntTypeDeclarationSQL(
                ['autoincrement' => true, 'primary' => true],
            ),
        );
        self::assertEquals(
            'BIGINT',
            $this->platform->getBigIntTypeDeclarationSQL(['unsigned' => false]),
        );
        self::assertEquals(
            'BIGINT UNSIGNED',
            $this->platform->getBigIntTypeDeclarationSQL(['unsigned' => true]),
        );
    }

    public function testGeneratesTypeDeclarationForStrings(): void
    {
        self::assertEquals(
            'CHAR(10)',
            $this->platform->getStringTypeDeclarationSQL(
                ['length' => 10, 'fixed' => true],
            ),
        );
        self::assertEquals(
            'VARCHAR(50)',
            $this->platform->getStringTypeDeclarationSQL(['length' => 50]),
        );
        self::assertEquals(
            'VARCHAR(255)',
            $this->platform->getStringTypeDeclarationSQL([]),
        );
    }

    public function getGenerateIndexSql(): string
    {
        return 'CREATE INDEX my_idx ON mytable (user_name, last_login)';
    }

    public function getGenerateUniqueIndexSql(): string
    {
        return 'CREATE UNIQUE INDEX index_name ON test (test, test2)';
    }

    public function testGeneratesForeignKeyCreationSql(): void
    {
        $this->expectException(Exception::class);

        parent::testGeneratesForeignKeyCreationSql();
    }

    public function testGeneratesConstraintCreationSql(): void
    {
        $this->expectException(Exception::class);

        parent::testGeneratesConstraintCreationSql();
    }

    protected function getGenerateForeignKeySql(): string
    {
        return '';
    }

    public function testModifyLimitQuery(): void
    {
        $sql = $this->platform->modifyLimitQuery('SELECT * FROM user', 10, 0);
        self::assertEquals('SELECT * FROM user LIMIT 10', $sql);
    }

    public function testModifyLimitQueryWithEmptyOffset(): void
    {
        $sql = $this->platform->modifyLimitQuery('SELECT * FROM user', 10);
        self::assertEquals('SELECT * FROM user LIMIT 10', $sql);
    }

    public function testModifyLimitQueryWithOffsetAndEmptyLimit(): void
    {
        $sql = $this->platform->modifyLimitQuery('SELECT * FROM user', null, 10);
        self::assertEquals('SELECT * FROM user LIMIT -1 OFFSET 10', $sql);
    }

    public function testGenerateTableSqlShouldNotAutoQuotePrimaryKey(): void
    {
        $table = new Table('test');
        $table->addColumn('"like"', 'integer', ['notnull' => true, 'autoincrement' => true]);
        $table->setPrimaryKey(['"like"']);

        $createTableSQL = $this->platform->getCreateTableSQL($table);
        self::assertEquals(
            'CREATE TABLE test ("like" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL)',
            $createTableSQL[0],
        );
    }

    public function testAlterTableAddColumns(): void
    {
        $diff = new TableDiff('user');

        $diff->addedColumns['foo']   = new Column('foo', Type::getType('string'));
        $diff->addedColumns['count'] = new Column('count', Type::getType('integer'), [
            'notnull' => false,
            'default' => 1,
        ]);

        $expected = [
            'ALTER TABLE user ADD COLUMN foo VARCHAR(255) NOT NULL',
            'ALTER TABLE user ADD COLUMN count INTEGER DEFAULT 1',
        ];

        self::assertEquals($expected, $this->platform->getAlterTableSQL($diff));
    }

    /** @dataProvider complexDiffProvider */
    public function testAlterTableAddComplexColumns(TableDiff $diff): void
    {
        $this->expectException(Exception::class);

        $this->platform->getAlterTableSQL($diff);
    }

    public function testRenameNonExistingColumn(): void
    {
        $table = new Table('test');
        $table->addColumn('id', 'integer');

        $tableDiff                          = new TableDiff('test');
        $tableDiff->fromTable               = $table;
        $tableDiff->renamedColumns['value'] = new Column('data', Type::getType('string'));

        $this->expectException(Exception::class);
        $this->platform->getAlterTableSQL($tableDiff);
    }

    /** @return mixed[][] */
    public static function complexDiffProvider(): iterable
    {
        $date                       = new TableDiff('user');
        $date->addedColumns['time'] = new Column('time', Type::getType('date'), ['default' => 'CURRENT_DATE']);

        $id                     = new TableDiff('user');
        $id->addedColumns['id'] = new Column('id', Type::getType('integer'), ['autoincrement' => true]);

        return [
            'date column with default value' => [$date],
            'id column with auto increment'  => [$id],
        ];
    }

    public function testCreateTableWithDeferredForeignKeys(): void
    {
        $table = new Table('user');
        $table->addColumn('id', 'integer');
        $table->addColumn('article', 'integer');
        $table->addColumn('post', 'integer');
        $table->addColumn('parent', 'integer');
        $table->setPrimaryKey(['id']);
        $table->addForeignKeyConstraint('article', ['article'], ['id'], ['deferrable' => true]);
        $table->addForeignKeyConstraint('post', ['post'], ['id'], ['deferred' => true]);
        $table->addForeignKeyConstraint('user', ['parent'], ['id'], ['deferrable' => true, 'deferred' => true]);

        $sql = [
            'CREATE TABLE user ('
                . 'id INTEGER NOT NULL, article INTEGER NOT NULL, post INTEGER NOT NULL, parent INTEGER NOT NULL'
                . ', PRIMARY KEY(id)'
                . ', CONSTRAINT FK_8D93D64923A0E66 FOREIGN KEY (article)'
                . ' REFERENCES article (id) DEFERRABLE INITIALLY IMMEDIATE'
                . ', CONSTRAINT FK_8D93D6495A8A6C8D FOREIGN KEY (post)'
                . ' REFERENCES post (id) NOT DEFERRABLE INITIALLY DEFERRED'
                . ', CONSTRAINT FK_8D93D6493D8E604F FOREIGN KEY (parent)'
                . ' REFERENCES user (id) DEFERRABLE INITIALLY DEFERRED'
                . ')',
            'CREATE INDEX IDX_8D93D64923A0E66 ON user (article)',
            'CREATE INDEX IDX_8D93D6495A8A6C8D ON user (post)',
            'CREATE INDEX IDX_8D93D6493D8E604F ON user (parent)',
        ];

        self::assertEquals($sql, $this->platform->getCreateTableSQL($table));
    }

    public function testAlterTable(): void
    {
        $table = new Table('user');
        $table->addColumn('id', 'integer');
        $table->addColumn('article', 'integer');
        $table->addColumn('post', 'integer');
        $table->addColumn('parent', 'integer');
        $table->setPrimaryKey(['id']);
        $table->addForeignKeyConstraint('article', ['article'], ['id'], ['deferrable' => true]);
        $table->addForeignKeyConstraint('post', ['post'], ['id'], ['deferred' => true]);
        $table->addForeignKeyConstraint('user', ['parent'], ['id'], ['deferrable' => true, 'deferred' => true]);
        $table->addIndex(['article', 'post'], 'index1');

        $diff                           = new TableDiff('user');
        $diff->fromTable                = $table;
        $diff->newName                  = 'client';
        $diff->renamedColumns['id']     = new Column('key', Type::getType('integer'), []);
        $diff->renamedColumns['post']   = new Column('comment', Type::getType('integer'), []);
        $diff->removedColumns['parent'] = new Column('parent', Type::getType('integer'), []);
        $diff->removedIndexes['index1'] = $table->getIndex('index1');

        $sql = [
            'CREATE TEMPORARY TABLE __temp__user AS SELECT id, article, post FROM user',
            'DROP TABLE user',
            'CREATE TABLE user ('
                . '"key" INTEGER NOT NULL, article INTEGER NOT NULL, comment INTEGER NOT NULL'
                . ', PRIMARY KEY("key")'
                . ', CONSTRAINT FK_8D93D64923A0E66 FOREIGN KEY (article)'
                . ' REFERENCES article (id) DEFERRABLE INITIALLY IMMEDIATE'
                . ', CONSTRAINT FK_8D93D6495A8A6C8D FOREIGN KEY (comment)'
                . ' REFERENCES post (id) NOT DEFERRABLE INITIALLY DEFERRED'
                . ')',
            'INSERT INTO user ("key", article, comment) SELECT id, article, post FROM __temp__user',
            'DROP TABLE __temp__user',
            'ALTER TABLE user RENAME TO client',
            'CREATE INDEX IDX_8D93D64923A0E66 ON client (article)',
            'CREATE INDEX IDX_8D93D6495A8A6C8D ON client (comment)',
        ];

        self::assertEquals($sql, $this->platform->getAlterTableSQL($diff));
    }

    /**
     * {@inheritDoc}
     */
    protected function getQuotedColumnInPrimaryKeySQL(): array
    {
        return ['CREATE TABLE "quoted" ("create" VARCHAR(255) NOT NULL, PRIMARY KEY("create"))'];
    }

    /**
     * {@inheritDoc}
     */
    protected function getQuotedColumnInIndexSQL(): array
    {
        return [
            'CREATE TABLE "quoted" ("create" VARCHAR(255) NOT NULL)',
            'CREATE INDEX IDX_22660D028FD6E0FB ON "quoted" ("create")',
        ];
    }

    /**
     * {@inheritDoc}
     */
    protected function getQuotedNameInIndexSQL(): array
    {
        return [
            'CREATE TABLE test (column1 VARCHAR(255) NOT NULL)',
            'CREATE INDEX "key" ON test (column1)',
        ];
    }

    /**
     * {@inheritDoc}
     */
    protected function getQuotedColumnInForeignKeySQL(): array
    {
        return [
            'CREATE TABLE "quoted" (' .
            '"create" VARCHAR(255) NOT NULL, foo VARCHAR(255) NOT NULL, "bar" VARCHAR(255) NOT NULL, ' .
            'CONSTRAINT FK_WITH_RESERVED_KEYWORD FOREIGN KEY ("create", foo, "bar") ' .
            'REFERENCES "foreign" ("create", bar, "foo-bar") NOT DEFERRABLE INITIALLY IMMEDIATE, ' .
            'CONSTRAINT FK_WITH_NON_RESERVED_KEYWORD FOREIGN KEY ("create", foo, "bar") ' .
            'REFERENCES foo ("create", bar, "foo-bar") NOT DEFERRABLE INITIALLY IMMEDIATE, ' .
            'CONSTRAINT FK_WITH_INTENDED_QUOTATION FOREIGN KEY ("create", foo, "bar") ' .
            'REFERENCES "foo-bar" ("create", bar, "foo-bar") NOT DEFERRABLE INITIALLY IMMEDIATE)',
            'CREATE INDEX IDX_22660D028FD6E0FB8C736521D79164E3 ON "quoted" ("create", foo, "bar")',
        ];
    }

    protected function getBinaryDefaultLength(): int
    {
        return 0;
    }

    protected function getBinaryMaxLength(): int
    {
        return 0;
    }

    public function testReturnsBinaryTypeDeclarationSQL(): void
    {
        self::assertSame('BLOB', $this->platform->getBinaryTypeDeclarationSQL([]));
        self::assertSame('BLOB', $this->platform->getBinaryTypeDeclarationSQL(['length' => 0]));
        self::assertSame('BLOB', $this->platform->getBinaryTypeDeclarationSQL(['length' => 9999999]));

        self::assertSame('BLOB', $this->platform->getBinaryTypeDeclarationSQL(['fixed' => true]));
        self::assertSame('BLOB', $this->platform->getBinaryTypeDeclarationSQL(['fixed' => true, 'length' => 0]));
        self::assertSame('BLOB', $this->platform->getBinaryTypeDeclarationSQL(['fixed' => true, 'length' => 9999999]));
    }

    /**
     * {@inheritDoc}
     */
    protected function getAlterTableRenameIndexSQL(): array
    {
        return [
            'CREATE TEMPORARY TABLE __temp__mytable AS SELECT id FROM mytable',
            'DROP TABLE mytable',
            'CREATE TABLE mytable (id INTEGER NOT NULL, PRIMARY KEY(id))',
            'INSERT INTO mytable (id) SELECT id FROM __temp__mytable',
            'DROP TABLE __temp__mytable',
            'CREATE INDEX idx_bar ON mytable (id)',
        ];
    }

    /**
     * {@inheritDoc}
     */
    protected function getQuotedAlterTableRenameIndexSQL(): array
    {
        return [
            'CREATE TEMPORARY TABLE __temp__table AS SELECT id FROM "table"',
            'DROP TABLE "table"',
            'CREATE TABLE "table" (id INTEGER NOT NULL, PRIMARY KEY(id))',
            'INSERT INTO "table" (id) SELECT id FROM __temp__table',
            'DROP TABLE __temp__table',
            'CREATE INDEX "select" ON "table" (id)',
            'CREATE INDEX "bar" ON "table" (id)',
        ];
    }

    /**
     * {@inheritdoc}
     */
    protected function getQuotedAlterTableRenameColumnSQL(): array
    {
        return [
            'CREATE TEMPORARY TABLE __temp__mytable AS SELECT unquoted1, unquoted2, unquoted3, '
                . '"create", "table", "select", "quoted1", "quoted2", "quoted3" FROM mytable',
            'DROP TABLE mytable',
            'CREATE TABLE mytable (unquoted INTEGER NOT NULL --Unquoted 1
, "where" INTEGER NOT NULL --Unquoted 2
, "foo" INTEGER NOT NULL --Unquoted 3
, reserved_keyword INTEGER NOT NULL --Reserved keyword 1
, "from" INTEGER NOT NULL --Reserved keyword 2
, "bar" INTEGER NOT NULL --Reserved keyword 3
, quoted INTEGER NOT NULL --Quoted 1
, "and" INTEGER NOT NULL --Quoted 2
, "baz" INTEGER NOT NULL --Quoted 3
)',
            'INSERT INTO mytable (unquoted, "where", "foo", reserved_keyword, "from", "bar", quoted, "and", "baz") '
                . 'SELECT unquoted1, unquoted2, unquoted3, "create", "table", "select", '
                . '"quoted1", "quoted2", "quoted3" FROM __temp__mytable',
            'DROP TABLE __temp__mytable',
        ];
    }

    /**
     * {@inheritdoc}
     */
    protected function getQuotedAlterTableChangeColumnLengthSQL(): array
    {
        return [
            'CREATE TEMPORARY TABLE __temp__mytable AS SELECT unquoted1, unquoted2, unquoted3, '
                . '"create", "table", "select" FROM mytable',
            'DROP TABLE mytable',
            'CREATE TABLE mytable (unquoted1 VARCHAR(255) NOT NULL --Unquoted 1
, unquoted2 VARCHAR(255) NOT NULL --Unquoted 2
, unquoted3 VARCHAR(255) NOT NULL --Unquoted 3
, "create" VARCHAR(255) NOT NULL --Reserved keyword 1
, "table" VARCHAR(255) NOT NULL --Reserved keyword 2
, "select" VARCHAR(255) NOT NULL --Reserved keyword 3
)',
            'INSERT INTO mytable (unquoted1, unquoted2, unquoted3, "create", "table", "select") '
                . 'SELECT unquoted1, unquoted2, unquoted3, "create", "table", "select" FROM __temp__mytable',
            'DROP TABLE __temp__mytable',
        ];
    }

    public function testAlterTableRenameIndexInSchema(): void
    {
        self::markTestIncomplete(
            'Test currently produces broken SQL due to SQLLitePlatform::getAlterTable() being broken ' .
            'when used with schemas.',
        );
    }

    public function testQuotesAlterTableRenameIndexInSchema(): void
    {
        self::markTestIncomplete(
            'Test currently produces broken SQL due to SQLLitePlatform::getAlterTable() being broken ' .
            'when used with schemas.',
        );
    }

    public function testReturnsGuidTypeDeclarationSQL(): void
    {
        self::assertSame('CHAR(36)', $this->platform->getGuidTypeDeclarationSQL([]));
    }

    /**
     * {@inheritdoc}
     */
    public function getAlterTableRenameColumnSQL(): array
    {
        return [
            'CREATE TEMPORARY TABLE __temp__foo AS SELECT bar FROM foo',
            'DROP TABLE foo',
            'CREATE TABLE foo (baz INTEGER DEFAULT 666 NOT NULL --rename test
)',
            'INSERT INTO foo (baz) SELECT bar FROM __temp__foo',
            'DROP TABLE __temp__foo',
        ];
    }

    /**
     * {@inheritdoc}
     */
    protected function getCommentOnColumnSQL(): array
    {
        return [
            'COMMENT ON COLUMN foo.bar IS \'comment\'',
            'COMMENT ON COLUMN "Foo"."BAR" IS \'comment\'',
            'COMMENT ON COLUMN "select"."from" IS \'comment\'',
        ];
    }

    protected static function getInlineColumnCommentDelimiter(): string
    {
        return "\n";
    }

    protected static function getInlineColumnRegularCommentSQL(): string
    {
        return "--Regular comment\n";
    }

    protected static function getInlineColumnCommentRequiringEscapingSQL(): string
    {
        return "--Using inline comment delimiter \n-- works\n";
    }

    protected static function getInlineColumnEmptyCommentSQL(): string
    {
        return "--\n";
    }

    protected function getQuotesReservedKeywordInUniqueConstraintDeclarationSQL(): string
    {
        return 'CONSTRAINT "select" UNIQUE (foo)';
    }

    protected function getQuotesReservedKeywordInIndexDeclarationSQL(): string
    {
        return 'INDEX "select" (foo)';
    }

    protected function getQuotesReservedKeywordInTruncateTableSQL(): string
    {
        return 'DELETE FROM "select"';
    }

    /**
     * {@inheritdoc}
     */
    protected function getAlterStringToFixedStringSQL(): array
    {
        return [
            'CREATE TEMPORARY TABLE __temp__mytable AS SELECT name FROM mytable',
            'DROP TABLE mytable',
            'CREATE TABLE mytable (name CHAR(2) NOT NULL)',
            'INSERT INTO mytable (name) SELECT name FROM __temp__mytable',
            'DROP TABLE __temp__mytable',
        ];
    }

    /**
     * {@inheritdoc}
     */
    protected function getGeneratesAlterTableRenameIndexUsedByForeignKeySQL(): array
    {
        return [
            'CREATE TEMPORARY TABLE __temp__mytable AS SELECT foo, bar, baz FROM mytable',
            'DROP TABLE mytable',
            'CREATE TABLE mytable (foo INTEGER NOT NULL, bar INTEGER NOT NULL, baz INTEGER NOT NULL, '
                . 'CONSTRAINT fk_foo FOREIGN KEY (foo) REFERENCES foreign_table (id)'
                . ' NOT DEFERRABLE INITIALLY IMMEDIATE, '
                . 'CONSTRAINT fk_bar FOREIGN KEY (bar) REFERENCES foreign_table (id)'
                . ' NOT DEFERRABLE INITIALLY IMMEDIATE)',
            'INSERT INTO mytable (foo, bar, baz) SELECT foo, bar, baz FROM __temp__mytable',
            'DROP TABLE __temp__mytable',
            'CREATE INDEX idx_bar ON mytable (bar)',
            'CREATE INDEX idx_foo_renamed ON mytable (foo)',
        ];
    }

    public function testQuotesTableNameInListTableConstraintsSQL(): void
    {
        self::assertStringContainsStringIgnoringCase(
            "'Foo''Bar\\'",
            $this->platform->getListTableConstraintsSQL("Foo'Bar\\"),
        );
    }

    public function testQuotesTableNameInListTableColumnsSQL(): void
    {
        self::assertStringContainsStringIgnoringCase(
            "'Foo''Bar\\'",
            $this->platform->getListTableColumnsSQL("Foo'Bar\\"),
        );
    }

    public function testQuotesTableNameInListTableIndexesSQL(): void
    {
        self::assertStringContainsStringIgnoringCase(
            "'Foo''Bar\\'",
            $this->platform->getListTableIndexesSQL("Foo'Bar\\"),
        );
    }

    public function testQuotesTableNameInListTableForeignKeysSQL(): void
    {
        self::assertStringContainsStringIgnoringCase(
            "'Foo''Bar\\'",
            $this->platform->getListTableForeignKeysSQL("Foo'Bar\\"),
        );
    }

    public function testQuotesDropForeignKeySQL(): void
    {
        $this->markTestSkipped('SQLite does not support altering foreign key constraints.');
    }

    public function testDateAddStaticNumberOfDays(): void
    {
        self::assertSame(
            "DATE(rentalBeginsOn,'+12 DAY')",
            $this->platform->getDateAddDaysExpression('rentalBeginsOn', 12),
        );
    }

    public function testDateAddNumberOfDaysFromColumn(): void
    {
        self::assertSame(
            "DATE(rentalBeginsOn,'+' || duration || ' DAY')",
            $this->platform->getDateAddDaysExpression('rentalBeginsOn', 'duration'),
        );
    }

    public function testSupportsColumnCollation(): void
    {
        self::assertTrue($this->platform->supportsColumnCollation());
    }

    public function testGetCreateTableSQLWithColumnCollation(): void
    {
        $table = new Table('foo');
        $table->addColumn('no_collation', 'string');
        $table->addColumn('column_collation', 'string')->setPlatformOption('collation', 'NOCASE');

        self::assertSame(
            [
                'CREATE TABLE foo (no_collation VARCHAR(255) NOT NULL, '
                    . 'column_collation VARCHAR(255) NOT NULL COLLATE "NOCASE")',
            ],
            $this->platform->getCreateTableSQL($table),
        );
    }
}