<?php
/**
 * Contains PhpMyAdmin\Plugins\Schema\Dia\RelationStatsDia class
 */

declare(strict_types=1);

namespace PhpMyAdmin\Plugins\Schema\Dia;

use function array_search;
use function shuffle;

/**
 * Relation preferences/statistics
 *
 * This class fetches the table master and foreign fields positions
 * and helps in generating the Table references and then connects
 * master table's master field to foreign table's foreign key
 * in dia XML document.
 */
class RelationStatsDia
{
    /** @var Dia */
    protected $diagram;

    /** @var mixed */
    public $srcConnPointsRight;

    /** @var mixed */
    public $srcConnPointsLeft;

    /** @var mixed */
    public $destConnPointsRight;

    /** @var mixed */
    public $destConnPointsLeft;

    /** @var int */
    public $masterTableId;

    /** @var int */
    public $foreignTableId;

    /** @var mixed */
    public $masterTablePos;

    /** @var mixed */
    public $foreignTablePos;

    /** @var string */
    public $referenceColor = '#000000';

    /**
     * @see Relation_Stats_Dia::getXy
     *
     * @param Dia           $diagram       The DIA diagram
     * @param TableStatsDia $master_table  The master table name
     * @param string        $master_field  The relation field in the master table
     * @param TableStatsDia $foreign_table The foreign table name
     * @param string        $foreign_field The relation field in the foreign table
     */
    public function __construct(
        $diagram,
        $master_table,
        $master_field,
        $foreign_table,
        $foreign_field
    ) {
        $this->diagram = $diagram;
        $src_pos = $this->getXy($master_table, $master_field);
        $dest_pos = $this->getXy($foreign_table, $foreign_field);
        $this->srcConnPointsLeft = $src_pos[0];
        $this->srcConnPointsRight = $src_pos[1];
        $this->destConnPointsLeft = $dest_pos[0];
        $this->destConnPointsRight = $dest_pos[1];
        $this->masterTablePos = $src_pos[2];
        $this->foreignTablePos = $dest_pos[2];
        $this->masterTableId = $master_table->tableId;
        $this->foreignTableId = $foreign_table->tableId;
    }

    /**
     * Each Table object have connection points
     * which is used to connect to other objects in Dia
     * we detect the position of key in fields and
     * then determines its left and right connection
     * points.
     *
     * @param TableStatsDia $table  The current table name
     * @param string        $column The relation column name
     *
     * @return array Table right,left connection points and key position
     */
    private function getXy($table, $column)
    {
        $pos = array_search($column, $table->fields);
        // left, right, position
        $value = 12;
        if ($pos != 0) {
            return [
                $pos + $value + $pos,
                $pos + $value + $pos + 1,
                $pos,
            ];
        }

        return [
            $pos + $value,
            $pos + $value + 1,
            $pos,
        ];
    }

    /**
     * Draws relation references
     *
     * connects master table's master field to foreign table's
     * foreign field using Dia object type Database - Reference
     * Dia object is used to generate the XML of Dia Document.
     * Database reference Object and their attributes are involved
     * in the combination of displaying Database - reference on Dia Document.
     *
     * @see    PDF
     *
     * @param bool $showColor Whether to use one color per relation or not
     *                        if showColor is true then an array of $listOfColors
     *                        will be used to choose the random colors for
     *                        references lines. we can change/add more colors to
     *                        this
     *
     * @return bool|void
     */
    public function relationDraw($showColor)
    {
        ++DiaRelationSchema::$objectId;
        /*
         * if source connection points and destination connection
        * points are same then return it false and don't draw that
        * relation
        */
        if ($this->srcConnPointsRight == $this->destConnPointsRight) {
            if ($this->srcConnPointsLeft == $this->destConnPointsLeft) {
                return false;
            }
        }

        if ($showColor) {
            $listOfColors = [
                'FF0000',
                '000099',
                '00FF00',
            ];
            shuffle($listOfColors);
            $this->referenceColor = '#' . $listOfColors[0] . '';
        } else {
            $this->referenceColor = '#000000';
        }

        $this->diagram->writeRaw(
            '<dia:object type="Database - Reference" version="0" id="'
            . DiaRelationSchema::$objectId . '">
            <dia:attribute name="obj_pos">
                <dia:point val="3.27,18.9198"/>
            </dia:attribute>
            <dia:attribute name="obj_bb">
                <dia:rectangle val="2.27,8.7175;17.7679,18.9198"/>
            </dia:attribute>
            <dia:attribute name="meta">
                <dia:composite type="dict"/>
            </dia:attribute>
            <dia:attribute name="orth_points">
                <dia:point val="3.27,18.9198"/>
                <dia:point val="2.27,18.9198"/>
                <dia:point val="2.27,14.1286"/>
                <dia:point val="17.7679,14.1286"/>
                <dia:point val="17.7679,9.3375"/>
                <dia:point val="16.7679,9.3375"/>
            </dia:attribute>
            <dia:attribute name="orth_orient">
                <dia:enum val="0"/>
                <dia:enum val="1"/>
                <dia:enum val="0"/>
                <dia:enum val="1"/>
                <dia:enum val="0"/>
            </dia:attribute>
            <dia:attribute name="orth_autoroute">
                <dia:boolean val="true"/>
            </dia:attribute>
            <dia:attribute name="text_colour">
                <dia:color val="#000000"/>
            </dia:attribute>
            <dia:attribute name="line_colour">
                <dia:color val="' . $this->referenceColor . '"/>
            </dia:attribute>
            <dia:attribute name="line_width">
                <dia:real val="0.10000000000000001"/>
            </dia:attribute>
            <dia:attribute name="line_style">
                <dia:enum val="0"/>
                <dia:real val="1"/>
            </dia:attribute>
            <dia:attribute name="corner_radius">
                <dia:real val="0"/>
            </dia:attribute>
            <dia:attribute name="end_arrow">
                <dia:enum val="22"/>
            </dia:attribute>
            <dia:attribute name="end_arrow_length">
                <dia:real val="0.5"/>
            </dia:attribute>
            <dia:attribute name="end_arrow_width">
                <dia:real val="0.5"/>
            </dia:attribute>
            <dia:attribute name="start_point_desc">
                <dia:string>#1#</dia:string>
            </dia:attribute>
            <dia:attribute name="end_point_desc">
                <dia:string>#n#</dia:string>
            </dia:attribute>
            <dia:attribute name="normal_font">
                <dia:font family="monospace" style="0" name="Courier"/>
            </dia:attribute>
            <dia:attribute name="normal_font_height">
                <dia:real val="0.59999999999999998"/>
            </dia:attribute>
            <dia:connections>
                <dia:connection handle="0" to="'
            . $this->masterTableId . '" connection="'
            . $this->srcConnPointsRight . '"/>
                <dia:connection handle="1" to="'
            . $this->foreignTableId . '" connection="'
            . $this->destConnPointsRight . '"/>
            </dia:connections>
            </dia:object>'
        );
    }
}