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<?php
namespace App\Modules\Users\Models;

use Illuminate\Database\Eloquent\Model;

class UserCoverageArea extends Model
{

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table="therapists_coverage_areas";

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = ['user_id','polygon_no','lat','lng'];

    /**
     * The address that belong to the user account.
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function user()
    {
        return $this->belongsTo('App\User');
    }

    static function is_in_polygon($points_polygon, $vertices_x, $vertices_y, $longitude_x, $latitude_y)
    {
      $i = $j = $c = $point = 0;
      for ($i = 0; $i < $points_polygon; $j = $i++) {
        $point = $i;
        // echo $points_polygon.'i'.$i;
        if( $point == $points_polygon )
          $point = 0;
        if ( (($vertices_y[$point]  >  $latitude_y != ($vertices_y[$j] > $latitude_y)) &&
         ($longitude_x < ($vertices_x[$j] - $vertices_x[$point]) * ($latitude_y - $vertices_y[$point]) / ($vertices_y[$j] - $vertices_y[$point]) + $vertices_x[$point]) ) )
           $c = !$c;
      }
      return $c;
    }

    static function pointInPolygon($point, $polygon, $pointOnVertex = true) {
        // $this->pointOnVertex = $pointOnVertex;

        // Transform string coordinates into arrays with x and y values
        $point = UserCoverageArea::pointStringToCoordinates($point);
        $vertices = array(); 
        foreach ($polygon as $vertex) {
            $vertices[] = UserCoverageArea::pointStringToCoordinates($vertex); 
        }

        // Check if the point sits exactly on a vertex
        if ($pointOnVertex == true and UserCoverageArea::pointOnVertex($point, $vertices) == true) {
            return true;
        }
        // Check if the point is inside the polygon or on the boundary
        $intersections = 0; 
        $vertices_count = count($vertices);

        for ($i=1; $i < $vertices_count; $i++) {
            $vertex1 = $vertices[$i-1]; 
            $vertex2 = $vertices[$i];
            if ($vertex1['y'] == $vertex2['y'] and $vertex1['y'] == $point['y'] and $point['x'] > min($vertex1['x'], $vertex2['x']) and $point['x'] < max($vertex1['x'], $vertex2['x'])) { // Check if point is on an horizontal polygon boundary
                return true;
            }
            if ($point['y'] > min($vertex1['y'], $vertex2['y']) and $point['y'] <= max($vertex1['y'], $vertex2['y']) and $point['x'] <= max($vertex1['x'], $vertex2['x']) and $vertex1['y'] != $vertex2['y']) { 
                $xinters = ($point['y'] - $vertex1['y']) * ($vertex2['x'] - $vertex1['x']) / ($vertex2['y'] - $vertex1['y']) + $vertex1['x']; 
                if ($xinters == $point['x']) { // Check if point is on the polygon boundary (other than horizontal)
                    return true;
                }
                if ($vertex1['x'] == $vertex2['x'] || $point['x'] <= $xinters) {
                    $intersections++; 
                }
            } 
        } 
        // If the number of edges we passed through is odd, then it's in the polygon. 
        if ($intersections % 2 != 0) {
            return true;
        } else {
            return false;
        }
    }

    static function pointOnVertex($point, $vertices) {
        foreach($vertices as $vertex) {
            if ($point == $vertex) {
                return true;
            }
        }

    }

    static function pointStringToCoordinates($pointString) {
        $coordinates = explode(" ", $pointString);
        return array("x" => $coordinates[0], "y" => $coordinates[1]);
    }

}