<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Http\JsonResponse;
use App\Models\ArtworkComment;
use App\Support\AvatarUrl;
use App\Services\ThumbnailPresenter;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;
use Carbon\Carbon;

class LatestCommentsApiController extends Controller
{
    private const PER_PAGE = 20;

    public function index(Request $request): JsonResponse
    {
        $type = $request->query('type', 'all');

        // Validate filter type
        if (! in_array($type, ['all', 'following', 'mine'], true)) {
            $type = 'all';
        }

        // 'mine' and 'following' require auth
        if (in_array($type, ['mine', 'following'], true) && ! $request->user()) {
            return response()->json(['error' => 'Unauthenticated'], 401);
        }

        $query = ArtworkComment::with(['user', 'user.profile', 'artwork'])
            ->whereHas('artwork', function ($q) {
                $q->public()->published()->whereNull('deleted_at');
            })
            ->orderByDesc('artwork_comments.created_at');

        switch ($type) {
            case 'mine':
                $query->where('artwork_comments.user_id', $request->user()->id);
                break;

            case 'following':
                $followingIds = $request->user()
                    ->following()
                    ->pluck('users.id');
                $query->whereIn('artwork_comments.user_id', $followingIds);
                break;

            default:
                // 'all' — cache the first page only
                if ((int) $request->query('page', 1) === 1) {
                    $cacheKey = 'comments.latest.all.page1';
                    $ttl      = 120; // 2 minutes

                    $paginator = Cache::remember($cacheKey, $ttl, fn () => $query->paginate(self::PER_PAGE));
                } else {
                    $paginator = $query->paginate(self::PER_PAGE);
                }
                break;
        }

        if (! isset($paginator)) {
            $paginator = $query->paginate(self::PER_PAGE);
        }

        $items = $paginator->getCollection()->map(function (ArtworkComment $c) {
            $art  = $c->artwork;
            $user = $c->user;

            $present = $art ? ThumbnailPresenter::present($art, 'md') : null;
            $thumb   = $present ? ($present['url'] ?? null) : null;

            $userId     = (int) ($c->user_id ?? 0);
            $avatarHash = $user?->profile?->avatar_hash ?? null;

            return [
                'comment_id'   => $c->getKey(),
                'comment_text' => e(strip_tags($c->content ?? '')),
                'created_at'   => $c->created_at?->toIso8601String(),
                'time_ago'     => $c->created_at ? Carbon::parse($c->created_at)->diffForHumans() : null,

                'commenter' => [
                    'id'          => $userId,
                    'username'    => $user?->username ?? null,
                    'display'     => $user?->username ?? $user?->name ?? 'User',
                    'profile_url' => $user?->username ? '/@' . $user->username : '/profile/' . $userId,
                    'avatar_url'  => AvatarUrl::forUser($userId, $avatarHash, 64),
                ],

                'artwork' => $art ? [
                    'id'    => $art->id,
                    'title' => $art->title,
                    'slug'  => $art->slug ?? Str::slug($art->title ?? ''),
                    'url'   => '/art/' . $art->id . '/' . ($art->slug ?? Str::slug($art->title ?? '')),
                    'thumb' => $thumb,
                ] : null,
            ];
        });

        return response()->json([
            'data' => $items,
            'meta' => [
                'current_page' => $paginator->currentPage(),
                'last_page'    => $paginator->lastPage(),
                'per_page'     => $paginator->perPage(),
                'total'        => $paginator->total(),
                'has_more'     => $paginator->hasMorePages(),
            ],
        ]);
    }
}