<?php

namespace Illuminate\Database\Schema\Grammars;

use Illuminate\Database\Connection;
use Illuminate\Database\Query\Expression;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Schema\ColumnDefinition;
use Illuminate\Database\Schema\ForeignKeyDefinition;
use Illuminate\Database\Schema\IndexDefinition;
use Illuminate\Support\Arr;
use Illuminate\Support\Fluent;
use RuntimeException;

class SQLiteGrammar extends Grammar
{
    /**
     * The possible column modifiers.
     *
     * @var string[]
     */
    protected $modifiers = ['Increment', 'Nullable', 'Default', 'Collate', 'VirtualAs', 'StoredAs'];

    /**
     * The columns available as serials.
     *
     * @var string[]
     */
    protected $serials = ['bigInteger', 'integer', 'mediumInteger', 'smallInteger', 'tinyInteger'];

    /**
     * Compile the query to determine the SQL text that describes the given object.
     *
     * @param  string  $name
     * @param  string  $type
     * @return string
     */
    public function compileSqlCreateStatement($name, $type = 'table')
    {
        return sprintf('select "sql" from sqlite_master where type = %s and name = %s',
            $this->wrap($type),
            $this->wrap(str_replace('.', '__', $name))
        );
    }

    /**
     * Compile the query to determine if the dbstat table is available.
     *
     * @return string
     */
    public function compileDbstatExists()
    {
        return "select exists (select 1 from pragma_compile_options where compile_options = 'ENABLE_DBSTAT_VTAB') as enabled";
    }

    /**
     * Compile the query to determine the tables.
     *
     * @param  bool  $withSize
     * @return string
     */
    public function compileTables($withSize = false)
    {
        return $withSize
            ? 'select m.tbl_name as name, sum(s.pgsize) as size from sqlite_master as m '
            .'join dbstat as s on s.name = m.name '
            ."where m.type in ('table', 'index') and m.tbl_name not like 'sqlite_%' "
            .'group by m.tbl_name '
            .'order by m.tbl_name'
            : "select name from sqlite_master where type = 'table' and name not like 'sqlite_%' order by name";
    }

    /**
     * Compile the query to determine the views.
     *
     * @return string
     */
    public function compileViews()
    {
        return "select name, sql as definition from sqlite_master where type = 'view' order by name";
    }

    /**
     * Compile the query to determine the columns.
     *
     * @param  string  $table
     * @return string
     */
    public function compileColumns($table)
    {
        return sprintf(
            'select name, type, not "notnull" as "nullable", dflt_value as "default", pk as "primary", hidden as "extra" '
            .'from pragma_table_xinfo(%s) order by cid asc',
            $this->wrap(str_replace('.', '__', $table))
        );
    }

    /**
     * Compile the query to determine the indexes.
     *
     * @param  string  $table
     * @return string
     */
    public function compileIndexes($table)
    {
        return sprintf(
            'select "primary" as name, group_concat(col) as columns, 1 as "unique", 1 as "primary" '
            .'from (select name as col from pragma_table_info(%s) where pk > 0 order by pk, cid) group by name '
            .'union select name, group_concat(col) as columns, "unique", origin = "pk" as "primary" '
            .'from (select il.*, ii.name as col from pragma_index_list(%s) il, pragma_index_info(il.name) ii order by il.seq, ii.seqno) '
            .'group by name, "unique", "primary"',
            $table = $this->wrap(str_replace('.', '__', $table)),
            $table
        );
    }

    /**
     * Compile the query to determine the foreign keys.
     *
     * @param  string  $table
     * @return string
     */
    public function compileForeignKeys($table)
    {
        return sprintf(
            'select group_concat("from") as columns, "table" as foreign_table, '
            .'group_concat("to") as foreign_columns, on_update, on_delete '
            .'from (select * from pragma_foreign_key_list(%s) order by id desc, seq) '
            .'group by id, "table", on_update, on_delete',
            $this->wrap(str_replace('.', '__', $table))
        );
    }

    /**
     * Compile a create table command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return string
     */
    public function compileCreate(Blueprint $blueprint, Fluent $command)
    {
        return sprintf('%s table %s (%s%s%s)',
            $blueprint->temporary ? 'create temporary' : 'create',
            $this->wrapTable($blueprint),
            implode(', ', $this->getColumns($blueprint)),
            $this->addForeignKeys($this->getCommandsByName($blueprint, 'foreign')),
            $this->addPrimaryKeys($this->getCommandByName($blueprint, 'primary'))
        );
    }

    /**
     * Get the foreign key syntax for a table creation statement.
     *
     * @param  \Illuminate\Database\Schema\ForeignKeyDefinition[]  $foreignKeys
     * @return string|null
     */
    protected function addForeignKeys($foreignKeys)
    {
        return collect($foreignKeys)->reduce(function ($sql, $foreign) {
            // Once we have all the foreign key commands for the table creation statement
            // we'll loop through each of them and add them to the create table SQL we
            // are building, since SQLite needs foreign keys on the tables creation.
            return $sql.$this->getForeignKey($foreign);
        }, '');
    }

    /**
     * Get the SQL for the foreign key.
     *
     * @param  \Illuminate\Support\Fluent  $foreign
     * @return string
     */
    protected function getForeignKey($foreign)
    {
        // We need to columnize the columns that the foreign key is being defined for
        // so that it is a properly formatted list. Once we have done this, we can
        // return the foreign key SQL declaration to the calling method for use.
        $sql = sprintf(', foreign key(%s) references %s(%s)',
            $this->columnize($foreign->columns),
            $this->wrapTable($foreign->on),
            $this->columnize((array) $foreign->references)
        );

        if (! is_null($foreign->onDelete)) {
            $sql .= " on delete {$foreign->onDelete}";
        }

        // If this foreign key specifies the action to be taken on update we will add
        // that to the statement here. We'll append it to this SQL and then return
        // this SQL so we can keep adding any other foreign constraints to this.
        if (! is_null($foreign->onUpdate)) {
            $sql .= " on update {$foreign->onUpdate}";
        }

        return $sql;
    }

    /**
     * Get the primary key syntax for a table creation statement.
     *
     * @param  \Illuminate\Support\Fluent|null  $primary
     * @return string|null
     */
    protected function addPrimaryKeys($primary)
    {
        if (! is_null($primary)) {
            return ", primary key ({$this->columnize($primary->columns)})";
        }
    }

    /**
     * Compile alter table commands for adding columns.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return array
     */
    public function compileAdd(Blueprint $blueprint, Fluent $command)
    {
        $columns = $this->prefixArray('add column', $this->getColumns($blueprint));

        return collect($columns)->map(function ($column) use ($blueprint) {
            return 'alter table '.$this->wrapTable($blueprint).' '.$column;
        })->all();
    }

    /**
     * Compile a change column command into a series of SQL statements.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @param  \Illuminate\Database\Connection  $connection
     * @return array|string
     *
     * @throws \RuntimeException
     */
    public function compileChange(Blueprint $blueprint, Fluent $command, Connection $connection)
    {
        $schema = $connection->getSchemaBuilder();
        $table = $blueprint->getTable();

        $changedColumns = collect($blueprint->getChangedColumns());
        $columnNames = [];
        $autoIncrementColumn = null;

        $columns = collect($schema->getColumns($table))
            ->map(function ($column) use ($blueprint, $changedColumns, &$columnNames, &$autoIncrementColumn) {
                $column = $changedColumns->first(fn ($col) => $col->name === $column['name'], $column);

                if ($column instanceof Fluent) {
                    $name = $this->wrap($column);
                    $autoIncrementColumn = $column->autoIncrement ? $column->name : $autoIncrementColumn;

                    if (is_null($column->virtualAs) && is_null($column->virtualAsJson) &&
                        is_null($column->storedAs) && is_null($column->storedAsJson)) {
                        $columnNames[] = $name;
                    }

                    return $this->addModifiers($name.' '.$this->getType($column), $blueprint, $column);
                } else {
                    $name = $this->wrap($column['name']);
                    $autoIncrementColumn = $column['auto_increment'] ? $column['name'] : $autoIncrementColumn;
                    $isGenerated = ! is_null($column['generation']);

                    if (! $isGenerated) {
                        $columnNames[] = $name;
                    }

                    return $this->addModifiers($name.' '.$column['type'], $blueprint,
                        new ColumnDefinition([
                            'change' => true,
                            'type' => $column['type_name'],
                            'nullable' => $column['nullable'],
                            'default' => $column['default'] ? new Expression($column['default']) : null,
                            'autoIncrement' => $column['auto_increment'],
                            'collation' => $column['collation'],
                            'comment' => $column['comment'],
                            'virtualAs' => $isGenerated && $column['generation']['type'] === 'virtual'
                                ? $column['generation']['expression'] : null,
                            'storedAs' => $isGenerated && $column['generation']['type'] === 'stored'
                                ? $column['generation']['expression'] : null,
                        ])
                    );
                }
            })->all();

        $foreignKeys = collect($schema->getForeignKeys($table))->map(fn ($foreignKey) => new ForeignKeyDefinition([
            'columns' => $foreignKey['columns'],
            'on' => $foreignKey['foreign_table'],
            'references' => $foreignKey['foreign_columns'],
            'onUpdate' => $foreignKey['on_update'],
            'onDelete' => $foreignKey['on_delete'],
        ]))->all();

        [$primary, $indexes] = collect($schema->getIndexes($table))->map(fn ($index) => new IndexDefinition([
            'name' => match (true) {
                $index['primary'] => 'primary',
                $index['unique'] => 'unique',
                default => 'index',
            },
            'index' => $index['name'],
            'columns' => $index['columns'],
        ]))->partition(fn ($index) => $index->name === 'primary');

        $indexes = collect($indexes)->reject(fn ($index) => str_starts_with('sqlite_', $index->index))->map(
            fn ($index) => $this->{'compile'.ucfirst($index->name)}($blueprint, $index)
        )->all();

        $tempTable = $this->wrap('__temp__'.$blueprint->getPrefix().$table);
        $table = $this->wrapTable($blueprint);
        $columnNames = implode(', ', $columnNames);

        $foreignKeyConstraintsEnabled = $connection->scalar('pragma foreign_keys');

        return array_filter(array_merge([
            $foreignKeyConstraintsEnabled ? $this->compileDisableForeignKeyConstraints() : null,
            sprintf('create table %s (%s%s%s)',
                $tempTable,
                implode(', ', $columns),
                $this->addForeignKeys($foreignKeys),
                $autoIncrementColumn ? '' : $this->addPrimaryKeys($primary->first())
            ),
            sprintf('insert into %s (%s) select %s from %s', $tempTable, $columnNames, $columnNames, $table),
            sprintf('drop table %s', $table),
            sprintf('alter table %s rename to %s', $tempTable, $table),
        ], $indexes, [$foreignKeyConstraintsEnabled ? $this->compileEnableForeignKeyConstraints() : null]));
    }

    /**
     * Compile a unique key command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return string
     */
    public function compileUnique(Blueprint $blueprint, Fluent $command)
    {
        return sprintf('create unique index %s on %s (%s)',
            $this->wrap($command->index),
            $this->wrapTable($blueprint),
            $this->columnize($command->columns)
        );
    }

    /**
     * Compile a plain index key command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return string
     */
    public function compileIndex(Blueprint $blueprint, Fluent $command)
    {
        return sprintf('create index %s on %s (%s)',
            $this->wrap($command->index),
            $this->wrapTable($blueprint),
            $this->columnize($command->columns)
        );
    }

    /**
     * Compile a spatial index key command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return void
     *
     * @throws \RuntimeException
     */
    public function compileSpatialIndex(Blueprint $blueprint, Fluent $command)
    {
        throw new RuntimeException('The database driver in use does not support spatial indexes.');
    }

    /**
     * Compile a foreign key command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return string|null
     */
    public function compileForeign(Blueprint $blueprint, Fluent $command)
    {
        // Handled on table creation...
    }

    /**
     * Compile a drop table command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return string
     */
    public function compileDrop(Blueprint $blueprint, Fluent $command)
    {
        return 'drop table '.$this->wrapTable($blueprint);
    }

    /**
     * Compile a drop table (if exists) command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return string
     */
    public function compileDropIfExists(Blueprint $blueprint, Fluent $command)
    {
        return 'drop table if exists '.$this->wrapTable($blueprint);
    }

    /**
     * Compile the SQL needed to drop all tables.
     *
     * @return string
     */
    public function compileDropAllTables()
    {
        return "delete from sqlite_master where type in ('table', 'index', 'trigger')";
    }

    /**
     * Compile the SQL needed to drop all views.
     *
     * @return string
     */
    public function compileDropAllViews()
    {
        return "delete from sqlite_master where type in ('view')";
    }

    /**
     * Compile the SQL needed to rebuild the database.
     *
     * @return string
     */
    public function compileRebuild()
    {
        return 'vacuum';
    }

    /**
     * Compile a drop column command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @param  \Illuminate\Database\Connection  $connection
     * @return array
     */
    public function compileDropColumn(Blueprint $blueprint, Fluent $command, Connection $connection)
    {
        $table = $this->wrapTable($blueprint);

        $columns = $this->prefixArray('drop column', $this->wrapArray($command->columns));

        return collect($columns)->map(fn ($column) => 'alter table '.$table.' '.$column)->all();
    }

    /**
     * Compile a drop unique key command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return string
     */
    public function compileDropUnique(Blueprint $blueprint, Fluent $command)
    {
        $index = $this->wrap($command->index);

        return "drop index {$index}";
    }

    /**
     * Compile a drop index command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return string
     */
    public function compileDropIndex(Blueprint $blueprint, Fluent $command)
    {
        $index = $this->wrap($command->index);

        return "drop index {$index}";
    }

    /**
     * Compile a drop spatial index command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return void
     *
     * @throws \RuntimeException
     */
    public function compileDropSpatialIndex(Blueprint $blueprint, Fluent $command)
    {
        throw new RuntimeException('The database driver in use does not support spatial indexes.');
    }

    /**
     * Compile a rename table command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @return string
     */
    public function compileRename(Blueprint $blueprint, Fluent $command)
    {
        $from = $this->wrapTable($blueprint);

        return "alter table {$from} rename to ".$this->wrapTable($command->to);
    }

    /**
     * Compile a rename index command.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $command
     * @param  \Illuminate\Database\Connection  $connection
     * @return array
     *
     * @throws \RuntimeException
     */
    public function compileRenameIndex(Blueprint $blueprint, Fluent $command, Connection $connection)
    {
        $indexes = $connection->getSchemaBuilder()->getIndexes($blueprint->getTable());

        $index = Arr::first($indexes, fn ($index) => $index['name'] === $command->from);

        if (! $index) {
            throw new RuntimeException("Index [{$command->from}] does not exist.");
        }

        if ($index['primary']) {
            throw new RuntimeException('SQLite does not support altering primary keys.');
        }

        if ($index['unique']) {
            return [
                $this->compileDropUnique($blueprint, new IndexDefinition(['index' => $index['name']])),
                $this->compileUnique($blueprint,
                    new IndexDefinition(['index' => $command->to, 'columns' => $index['columns']])
                ),
            ];
        }

        return [
            $this->compileDropIndex($blueprint, new IndexDefinition(['index' => $index['name']])),
            $this->compileIndex($blueprint,
                new IndexDefinition(['index' => $command->to, 'columns' => $index['columns']])
            ),
        ];
    }

    /**
     * Compile the command to enable foreign key constraints.
     *
     * @return string
     */
    public function compileEnableForeignKeyConstraints()
    {
        return 'PRAGMA foreign_keys = ON;';
    }

    /**
     * Compile the command to disable foreign key constraints.
     *
     * @return string
     */
    public function compileDisableForeignKeyConstraints()
    {
        return 'PRAGMA foreign_keys = OFF;';
    }

    /**
     * Compile the SQL needed to enable a writable schema.
     *
     * @return string
     */
    public function compileEnableWriteableSchema()
    {
        return 'PRAGMA writable_schema = 1;';
    }

    /**
     * Compile the SQL needed to disable a writable schema.
     *
     * @return string
     */
    public function compileDisableWriteableSchema()
    {
        return 'PRAGMA writable_schema = 0;';
    }

    /**
     * Create the column definition for a char type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeChar(Fluent $column)
    {
        return 'varchar';
    }

    /**
     * Create the column definition for a string type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeString(Fluent $column)
    {
        return 'varchar';
    }

    /**
     * Create the column definition for a tiny text type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeTinyText(Fluent $column)
    {
        return 'text';
    }

    /**
     * Create the column definition for a text type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeText(Fluent $column)
    {
        return 'text';
    }

    /**
     * Create the column definition for a medium text type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeMediumText(Fluent $column)
    {
        return 'text';
    }

    /**
     * Create the column definition for a long text type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeLongText(Fluent $column)
    {
        return 'text';
    }

    /**
     * Create the column definition for an integer type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeInteger(Fluent $column)
    {
        return 'integer';
    }

    /**
     * Create the column definition for a big integer type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeBigInteger(Fluent $column)
    {
        return 'integer';
    }

    /**
     * Create the column definition for a medium integer type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeMediumInteger(Fluent $column)
    {
        return 'integer';
    }

    /**
     * Create the column definition for a tiny integer type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeTinyInteger(Fluent $column)
    {
        return 'integer';
    }

    /**
     * Create the column definition for a small integer type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeSmallInteger(Fluent $column)
    {
        return 'integer';
    }

    /**
     * Create the column definition for a float type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeFloat(Fluent $column)
    {
        return 'float';
    }

    /**
     * Create the column definition for a double type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeDouble(Fluent $column)
    {
        return 'double';
    }

    /**
     * Create the column definition for a decimal type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeDecimal(Fluent $column)
    {
        return 'numeric';
    }

    /**
     * Create the column definition for a boolean type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeBoolean(Fluent $column)
    {
        return 'tinyint(1)';
    }

    /**
     * Create the column definition for an enumeration type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeEnum(Fluent $column)
    {
        return sprintf(
            'varchar check ("%s" in (%s))',
            $column->name,
            $this->quoteString($column->allowed)
        );
    }

    /**
     * Create the column definition for a json type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeJson(Fluent $column)
    {
        return 'text';
    }

    /**
     * Create the column definition for a jsonb type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeJsonb(Fluent $column)
    {
        return 'text';
    }

    /**
     * Create the column definition for a date type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeDate(Fluent $column)
    {
        return 'date';
    }

    /**
     * Create the column definition for a date-time type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeDateTime(Fluent $column)
    {
        return $this->typeTimestamp($column);
    }

    /**
     * Create the column definition for a date-time (with time zone) type.
     *
     * Note: "SQLite does not have a storage class set aside for storing dates and/or times."
     *
     * @link https://www.sqlite.org/datatype3.html
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeDateTimeTz(Fluent $column)
    {
        return $this->typeDateTime($column);
    }

    /**
     * Create the column definition for a time type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeTime(Fluent $column)
    {
        return 'time';
    }

    /**
     * Create the column definition for a time (with time zone) type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeTimeTz(Fluent $column)
    {
        return $this->typeTime($column);
    }

    /**
     * Create the column definition for a timestamp type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeTimestamp(Fluent $column)
    {
        if ($column->useCurrent) {
            $column->default(new Expression('CURRENT_TIMESTAMP'));
        }

        return 'datetime';
    }

    /**
     * Create the column definition for a timestamp (with time zone) type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeTimestampTz(Fluent $column)
    {
        return $this->typeTimestamp($column);
    }

    /**
     * Create the column definition for a year type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeYear(Fluent $column)
    {
        return $this->typeInteger($column);
    }

    /**
     * Create the column definition for a binary type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeBinary(Fluent $column)
    {
        return 'blob';
    }

    /**
     * Create the column definition for a uuid type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeUuid(Fluent $column)
    {
        return 'varchar';
    }

    /**
     * Create the column definition for an IP address type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeIpAddress(Fluent $column)
    {
        return 'varchar';
    }

    /**
     * Create the column definition for a MAC address type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeMacAddress(Fluent $column)
    {
        return 'varchar';
    }

    /**
     * Create the column definition for a spatial Geometry type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeGeometry(Fluent $column)
    {
        return 'geometry';
    }

    /**
     * Create the column definition for a spatial Geography type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return string
     */
    protected function typeGeography(Fluent $column)
    {
        return $this->typeGeometry($column);
    }

    /**
     * Create the column definition for a generated, computed column type.
     *
     * @param  \Illuminate\Support\Fluent  $column
     * @return void
     *
     * @throws \RuntimeException
     */
    protected function typeComputed(Fluent $column)
    {
        throw new RuntimeException('This database driver requires a type, see the virtualAs / storedAs modifiers.');
    }

    /**
     * Get the SQL for a generated virtual column modifier.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $column
     * @return string|null
     */
    protected function modifyVirtualAs(Blueprint $blueprint, Fluent $column)
    {
        if (! is_null($virtualAs = $column->virtualAsJson)) {
            if ($this->isJsonSelector($virtualAs)) {
                $virtualAs = $this->wrapJsonSelector($virtualAs);
            }

            return " as ({$virtualAs})";
        }

        if (! is_null($virtualAs = $column->virtualAs)) {
            return " as ({$this->getValue($virtualAs)})";
        }
    }

    /**
     * Get the SQL for a generated stored column modifier.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $column
     * @return string|null
     */
    protected function modifyStoredAs(Blueprint $blueprint, Fluent $column)
    {
        if (! is_null($storedAs = $column->storedAsJson)) {
            if ($this->isJsonSelector($storedAs)) {
                $storedAs = $this->wrapJsonSelector($storedAs);
            }

            return " as ({$storedAs}) stored";
        }

        if (! is_null($storedAs = $column->storedAs)) {
            return " as ({$this->getValue($column->storedAs)}) stored";
        }
    }

    /**
     * Get the SQL for a nullable column modifier.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $column
     * @return string|null
     */
    protected function modifyNullable(Blueprint $blueprint, Fluent $column)
    {
        if (is_null($column->virtualAs) &&
            is_null($column->virtualAsJson) &&
            is_null($column->storedAs) &&
            is_null($column->storedAsJson)) {
            return $column->nullable ? '' : ' not null';
        }

        if ($column->nullable === false) {
            return ' not null';
        }
    }

    /**
     * Get the SQL for a default column modifier.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $column
     * @return string|null
     */
    protected function modifyDefault(Blueprint $blueprint, Fluent $column)
    {
        if (! is_null($column->default) && is_null($column->virtualAs) && is_null($column->virtualAsJson) && is_null($column->storedAs)) {
            return ' default '.$this->getDefaultValue($column->default);
        }
    }

    /**
     * Get the SQL for an auto-increment column modifier.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $column
     * @return string|null
     */
    protected function modifyIncrement(Blueprint $blueprint, Fluent $column)
    {
        if (in_array($column->type, $this->serials) && $column->autoIncrement) {
            return ' primary key autoincrement';
        }
    }

    /**
     * Get the SQL for a collation column modifier.
     *
     * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
     * @param  \Illuminate\Support\Fluent  $column
     * @return string|null
     */
    protected function modifyCollate(Blueprint $blueprint, Fluent $column)
    {
        if (! is_null($column->collation)) {
            return " collate '{$column->collation}'";
        }
    }

    /**
     * Wrap the given JSON selector.
     *
     * @param  string  $value
     * @return string
     */
    protected function wrapJsonSelector($value)
    {
        [$field, $path] = $this->wrapJsonFieldAndPath($value);

        return 'json_extract('.$field.$path.')';
    }
}