<?php

namespace App\Http\Resources\Mobile;

use Illuminate\Http\Resources\Json\JsonResource;

/**
 * Public representation of a course.
 *
 * Do not return Course models directly from public mobile endpoints. Course
 * has computed appends and relations that contain internal and personal data.
 */
class PublicCourseResource extends JsonResource
{
    public function toArray($request)
    {
        $course = $this->resource;

        return [
            'id' => (int) $this->id,
            'name' => $this->name,
            'start_date' => $this->start_date,
            'end_date' => $this->end_date,
            'content' => $this->content,
            'publicize_content' => $this->publicize_content,
            'type' => $this->type === null ? null : (int) $this->type,
            'is_fee' => $this->is_fee === null ? null : (int) $this->is_fee,
            'total' => $this->total === null ? null : (int) $this->total,
            'show_txl' => $this->show_txl === null ? null : (int) $this->show_txl,
            'show_mobile' => $this->show_mobile === null ? null : (int) $this->show_mobile,
            'url' => $this->url,
            'url_title' => $this->url_title,
            'status' => (int) $this->status,
            'course_status' => (int) $this->course_status,
            'sign_status' => (int) $this->sign_status,
            'my_user' => isset($this->my_user) ? (int) $this->my_user : 0,
            'type_detail' => $this->whenLoaded('typeDetail', function () {
                if (!$this->typeDetail) {
                    return null;
                }

                return [
                    'id' => (int) $this->typeDetail->id,
                    'name' => $this->typeDetail->name,
                ];
            }),
            'image' => $this->whenLoaded('image', function () {
                if (!$this->image) {
                    return null;
                }

                return [
                    'id' => (int) $this->image->id,
                    'url' => $this->image->url,
                ];
            }),
            'qun_image_id' => $this->qun_image_id === null ? null : (int) $this->qun_image_id,
            'qun_image' => $this->whenLoaded('qunImage', function () {
                return $this->safeUpload($this->qunImage);
            }),
            'publicize' => $course->relationLoaded('publicAssets')
                ? $course->getRelation('publicAssets')->map(fn ($upload) => $this->safeUpload($upload))->values()->all()
                : [],
            'teacher' => $this->whenLoaded('teacher', function () {
                if (!$this->teacher) {
                    return null;
                }

                return [
                    'id' => (int) $this->teacher->id,
                    'name' => $this->teacher->name,
                    'introduce' => $this->teacher->introduce,
                ];
            }),
            'course_forms' => $this->whenLoaded('courseForms', function () {
                return $this->courseForms->map(function ($form) {
                    // Keep only fields needed to render the public sign-up form.
                    return [
                        'id' => (int) $form->id,
                        'name' => $form->name,
                        'field' => $form->field,
                        'edit_input' => $form->edit_input,
                        'rule' => $form->rule,
                        'sort' => (int) $form->sort,
                        'help' => $form->help,
                        'select_item' => $form->select_item,
                        'need_fill' => (bool) $form->need_fill,
                        'belong_user' => (bool) $form->belong_user,
                    ];
                })->values()->all();
            }),
            'course_signs_count' => $this->when(
                isset($this->course_signs_count),
                (int) $this->course_signs_count
            ),
        ];
    }

    private function safeUpload($upload): ?array
    {
        if (!$upload) {
            return null;
        }

        return [
            'id' => (int) $upload->id,
            'url' => $upload->url,
        ];
    }
}