<?php

namespace App\Models;

use App\Tables\Column;
use Illuminate\Database\Eloquent\Builder;

/**
 * Row in a data table
 *
 * @property int $id
 * @property object|\RowData $data - JSONB, always containing _id
 */
class Row extends BaseModel
{
    protected $casts = [
        'data' => 'object',
    ];

    protected $guarded = [];
    public $timestamps = false;

    public function getRowIdAttribute() {
        return $this->data->_id;
    }

    public function setRowIdAttribute($value) {
        $this->data->_id = $value;
    }

    public function scopeSortByCol(Builder $query, Column $column, $dir="asc")
    {
        $q = "data->>'".$column->id."'";

        $dir = strtoupper($dir);

        switch ($column->type) {
            case 'int':
                $q = "CAST($q AS INTEGER) $dir";
                break;

            case 'float':
                $q = "CAST($q AS FLOAT) $dir";
                break;

            case 'string':
                // Without a size restriction and a cast, this query becomes VERY slow
                $q = "CAST($q AS CHAR(25)) $dir, data->>'_id' $dir";
                // added _id as a fallback to ensure the order is the same between revisions
                break;

            case 'bool':
                $q = "CAST($q AS boolean) $dir";
                break;

            default:
                throw new \LogicException("Missing SQL cast for column type $column->type, performance will suffer.");
        }

        return $query->orderByRaw($q);
    }

    /**
     * Allocate a single Global Row ID, application-unique.
     *
     * GRIDs are used to uniquely identify existing or proposed new rows,
     * and are preserved after row modifications, to ensure change proposals have
     * a clear target.
     *
     * @return int
     */
    public static function allocateRowID()
    {
        return \DB::selectOne("SELECT nextval('global_row_id_seq') AS rid;")->rid;
    }

    /**
     * Allocate a block of Global Row IDs, application-unique.
     *
     * @see Row::allocateRowID()
     *
     * @return int[] first and last
     */
    public static function allocateRowIDs($count)
    {
        $last = \DB::selectOne("SELECT multi_nextval('global_row_id_seq', ?) AS last_id;", [$count])->last_id;
        return [$last - $count + 1, $last];
    }

    /**
     * Allocate a single Global Column ID, application-unique.
     *
     * GCIDs are used to uniquely identify existing or proposed new columns,
     * and are preserved after column modifications, to ensure change proposals have
     * a clear target. This is the column equivalent of GRID.
     *
     * @return int
     */
    public static function allocateColID()
    {
        return \DB::selectOne("SELECT nextval('global_column_id_seq') AS cid;")->cid;
    }

    /**
     * Allocate a block of Global Column IDs, application-unique.
     *
     * @see Row::allocateColID()
     *
     * @return int[] first and last
     */
    public static function allocateColIDs($count)
    {
        $last = \DB::selectOne("SELECT multi_nextval('global_column_id_seq', ?) AS last_id;", [$count])->last_id;
        return [$last - $count + 1, $last];
    }
}