Add Livewire comment system

app/Livewire/Comment.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace App\Livewire;
+
+use Livewire\Component;
+use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
+
+class Comment extends Component
+{
+    use AuthorizesRequests;
+
+    public $comment;
+
+    public $isReplying = false;
+
+    public $replyState = [
+        'body' => ''
+    ];
+
+    public $isEditing = false;
+
+    public $editState = [
+        'body' => ''
+    ];
+
+    protected $listeners = [
+        'refresh' => '$refresh'
+    ];
+
+    protected $validationAttributes = [
+        'replyState.body' => 'reply'
+    ];
+
+    public function updatedIsEditing($isEditing)
+    {
+        if (! $isEditing) {
+            return;
+        }
+
+        $this->editState = [
+            'body' => $this->comment->body
+        ];
+    }
+
+    public function editComment()
+    {
+        $this->authorize('update', $this->comment);
+
+        $this->comment->update($this->editState);
+
+        $this->isEditing = false;
+    }
+
+    public function deleteComment()
+    {
+        $this->authorize('destroy', $this->comment);
+
+        $this->comment->delete();
+    }
+
+    public function postReply()
+    {
+        if (! $this->comment->depth() < 2) {
+            return;
+        }
+
+        $this->validate([
+            'replyState.body' => 'required'
+        ]);
+
+        $reply = $this->comment->children()->make($this->replyState);
+        $reply->user()->associate(auth()->user());
+        $reply->commentable()->associate($this->comment->commentable);
+
+        $reply->save();
+
+        $this->replyState = [
+            'body' => ''
+        ];
+
+        $this->isReplying = false;
+
+        $this->dispatch('refresh')->self(); 
+    }
+
+    public function render()
+    {
+        return view('livewire.comment');
+    }
+}

app/Livewire/Comments.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Livewire;
+
+use Livewire\Component;
+use Livewire\WithPagination;
+
+class Comments extends Component
+{
+    use WithPagination;
+
+    public $model;
+
+    public $newCommentState = [
+      'body' => ''
+    ];
+
+    protected $validationAttributes = [
+        'newCommentState.body' => 'comment'
+    ];
+
+    protected $listeners = [
+        'refresh' => '$refresh'
+    ];
+
+    public function postComment()
+    {
+        $this->validate([
+            'newCommentState.body' => 'required'
+        ]);
+
+        $comment = $this->model->comments()->make($this->newCommentState);
+        $comment->user()->associate(auth()->user());
+        $comment->save();
+
+        $this->newCommentState = [
+            'body' => ''
+        ];
+
+        $this->resetPage();
+    }
+
+    public function render()
+    {
+        $comments = $this->model
+            ->comments()
+            ->with('user', 'children.user', 'children.children')
+            ->parent()
+            ->latest()
+            ->paginate(3);
+
+        return view('livewire.comments', [
+            'comments' => $comments
+        ]);
+    }
+}

app/Models/Comment.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Presenters\CommentPresenter;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+
+class Comment extends Model
+{
+    use HasFactory, SoftDeletes;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var string[]
+     */
+    protected $fillable = [
+        'body'
+    ];
+
+    public function presenter()
+    {
+        return new CommentPresenter($this);
+    }
+
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function scopeParent(Builder $builder)
+    {
+        $builder->whereNull('parent_id');
+    }
+
+    public function children()
+    {
+        return $this->hasMany(Comment::class, 'parent_id')->oldest();
+    }
+
+    public function commentable()
+    {
+        return $this->morphTo();
+    }
+
+    public function parent()
+    {
+        return $this->hasOne(Comment::class, 'id', 'parent_id');
+    }
+
+    // Recursevly calculates how deep the nesting is
+    public function depth(): int
+    {
+        return $this->parent
+            ? $this->parent->depth() + 1
+            : 0;
+    }
+}

app/Models/Episode.php

@@ -160,6 +160,11 @@ class Episode extends Model implements Sitemapable
         return cache()->remember('episodeComments' . $this->id, 300, fn() => $this->comments->count());
     }
 
+    public function comments()
+    {
+        return $this->morphMany(Comment::class, 'commentable');
+    }
+
     public function getProblematicTags(): string
     {
         $problematicTags = ['Gore', 'Scat', 'Horror'];

app/Models/Presenters/CommentPresenter.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Models\Presenters;
+
+use App\Models\Comment;
+use Illuminate\Support\Str;
+
+class CommentPresenter
+{
+    public $comment;
+
+    public function __construct(Comment $comment)
+    {
+        $this->comment = $comment;
+    }
+
+    public function markdownBody()
+    {
+        return Str::of($this->comment->body)->markdown([
+            'html_input' => 'strip',
+        ]);
+    }
+
+    public function relativeCreatedAt()
+    {
+        return $this->comment->created_at->diffForHumans();
+    }
+}

app/Policies/CommentPolicy.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\User;
+use App\Models\Comment;
+use Illuminate\Auth\Access\HandlesAuthorization;
+
+class CommentPolicy
+{
+    use HandlesAuthorization;
+
+    public function update(User $user, Comment $comment): bool
+    {
+        return $user->id === $comment->user_id;
+    }
+
+    public function destroy(User $user, Comment $comment): bool
+    {
+        return $user->id === $comment->user_id;
+    }
+}