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<?php

namespace Illuminate\Database\Query\Grammars;

use Illuminate\Database\Query\Builder;

class SQLiteGrammar extends Grammar
{
    /**
     * All of the available clause operators.
     *
     * @var array
     */
    protected $operators = [
        '=', '<', '>', '<=', '>=', '<>', '!=',
        'like', 'not like', 'between', 'ilike',
        '&', '|', '<<', '>>',
    ];

/**
     * Compile an insert statement into SQL.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @param  array  $values
     * @return string
     */
    public function compileInsert(Builder $query, array $values)
    {
        // Essentially we will force every insert to be treated as a batch insert which
        // simply makes creating the SQL easier for us since we can utilize the same
        // basic routine regardless of an amount of records given to us to insert.
        $table = $this->wrapTable($query->from);

if (! is_array(reset($values))) {
            $values = [$values];
        }

// If there is only one record being inserted, we will just use the usual query
        // grammar insert builder because no special syntax is needed for the single
        // row inserts in SQLite. However, if there are multiples, we'll continue.
        if (count($values) == 1) {
            return parent::compileInsert($query, reset($values));
        }

$names = $this->columnize(array_keys(reset($values)));

$columns = [];

// SQLite requires us to build the multi-row insert as a listing of select with
        // unions joining them together. So we'll build out this list of columns and
        // then join them all together with select unions to complete the queries.
        foreach (array_keys(reset($values)) as $column) {
            $columns[] = '? as '.$this->wrap($column);
        }

$columns = array_fill(0, count($values), implode(', ', $columns));

return "insert into $table ($names) select ".implode(' union all select ', $columns);
    }

/**
     * Compile a truncate table statement into SQL.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @return array
     */
    public function compileTruncate(Builder $query)
    {
        $sql = ['delete from sqlite_sequence where name = ?' => [$query->from]];

$sql['delete from '.$this->wrapTable($query->from)] = [];

return $sql;
    }

/**
     * Compile a "where date" clause.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @param  array  $where
     * @return string
     */
    protected function whereDate(Builder $query, $where)
    {
        return $this->dateBasedWhere('%Y-%m-%d', $query, $where);
    }

/**
     * Compile a "where day" clause.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @param  array  $where
     * @return string
     */
    protected function whereDay(Builder $query, $where)
    {
        return $this->dateBasedWhere('%d', $query, $where);
    }

/**
     * Compile a "where month" clause.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @param  array  $where
     * @return string
     */
    protected function whereMonth(Builder $query, $where)
    {
        return $this->dateBasedWhere('%m', $query, $where);
    }

/**
     * Compile a "where year" clause.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @param  array  $where
     * @return string
     */
    protected function whereYear(Builder $query, $where)
    {
        return $this->dateBasedWhere('%Y', $query, $where);
    }

/**
     * Compile a date based where clause.
     *
     * @param  string  $type
     * @param  \Illuminate\Database\Query\Builder  $query
     * @param  array  $where
     * @return string
     */
    protected function dateBasedWhere($type, Builder $query, $where)
    {
        $value = str_pad($where['value'], 2, '0', STR_PAD_LEFT);

$value = $this->parameter($value);

return 'strftime(\''.$type.'\', '.$this->wrap($where['column']).') '.$where['operator'].' '.$value;
    }
}