<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Model;

use Illuminate\Support\Arr;

use App\Traits\AppendAttributesTrait;
use App\Traits\ContentElementTrait;
use App\Traits\PhotosTrait;
use App\Utilities\PageLink;

use App\Contracts\SearchResultContract;
use App\Utilities\SearchResult;

class CourseDescription extends Model implements SearchResultContract
{
    use HasFactory;
    use SoftDeletes;
    use ContentElementTrait;
    use AppendAttributesTrait;
    use PhotosTrait;

    public function saveContent(array $input, $id = null)
    {
        if ($id) {
            $course_description = CourseDescription::findOrFail($id);
        } else {
            $course_description = new CourseDescription();
        }

        $course_description->header = Arr::get($input, 'header');
        $course_description->body = Arr::get($input, 'body');
        $course_description->credit = Arr::get($input, 'credit');
        $course_description->save();

        cache()->tags([cache_name($course_description)])->flush();
        return $course_description;
    }

    public function getBodyAttribute($value)
    {
        return $this->convertAttributeLinks($value, 'body');
    }

    public function getSearchFieldsAttribute()
    {
        return [
            'header',
            'body',
            'credit',
        ];
    }

    public function getSearchResultTitle($default = null)
    {
        return $this->header; // TODO default to course parent name if no header
    }

    public function getSearchResultPreview($terms)
    {
        return SearchResult::truncatePreview(strip_tags($this->body) ? $this->body : $this->header, $terms);
    }

    public function getSearchResultRank($terms)
    {
        $rank = 0;
        foreach ($terms as $term) {
            $rank += mb_substr_count($this->header, $term);
            $rank += mb_substr_count($this->body, $term) * 0.5;
            $rank += mb_substr_count($this->credit, $term) * 0.5;
        }
        return $rank;
    }
}