<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

final class ArtworkInteractionController extends Controller
{
    public function favorite(Request $request, int $artworkId): JsonResponse
    {
        $this->toggleSimple(
            request: $request,
            table: 'user_favorites',
            keyColumns: ['user_id', 'artwork_id'],
            keyValues: ['user_id' => (int) $request->user()->id, 'artwork_id' => $artworkId],
            insertPayload: ['created_at' => now()],
            requiredTable: 'user_favorites'
        );

        $this->syncArtworkStats($artworkId);

        return response()->json($this->statusPayload((int) $request->user()->id, $artworkId));
    }

    public function like(Request $request, int $artworkId): JsonResponse
    {
        $this->toggleSimple(
            request: $request,
            table: 'artwork_likes',
            keyColumns: ['user_id', 'artwork_id'],
            keyValues: ['user_id' => (int) $request->user()->id, 'artwork_id' => $artworkId],
            insertPayload: ['created_at' => now(), 'updated_at' => now()],
            requiredTable: 'artwork_likes'
        );

        $this->syncArtworkStats($artworkId);

        return response()->json($this->statusPayload((int) $request->user()->id, $artworkId));
    }

    public function report(Request $request, int $artworkId): JsonResponse
    {
        if (! Schema::hasTable('artwork_reports')) {
            return response()->json(['message' => 'Reporting unavailable'], 422);
        }

        $data = $request->validate([
            'reason' => ['nullable', 'string', 'max:1000'],
        ]);

        DB::table('artwork_reports')->updateOrInsert(
            [
                'artwork_id' => $artworkId,
                'reporter_user_id' => (int) $request->user()->id,
            ],
            [
                'reason' => trim((string) ($data['reason'] ?? '')) ?: null,
                'reported_at' => now(),
                'created_at' => now(),
                'updated_at' => now(),
            ]
        );

        return response()->json(['ok' => true, 'reported' => true]);
    }

    public function follow(Request $request, int $userId): JsonResponse
    {
        if (! Schema::hasTable('friends_list')) {
            return response()->json(['message' => 'Follow unavailable'], 422);
        }

        $actorId = (int) $request->user()->id;
        if ($actorId === $userId) {
            return response()->json(['message' => 'Cannot follow yourself'], 422);
        }

        $state = $request->boolean('state', true);

        $query = DB::table('friends_list')
            ->where('user_id', $actorId)
            ->where('friend_id', $userId);

        if ($state) {
            if (! $query->exists()) {
                DB::table('friends_list')->insert([
                    'user_id' => $actorId,
                    'friend_id' => $userId,
                    'date_added' => now(),
                ]);
            }
        } else {
            $query->delete();
        }

        $followersCount = (int) DB::table('friends_list')
            ->where('friend_id', $userId)
            ->count();

        return response()->json([
            'ok' => true,
            'is_following' => $state,
            'followers_count' => $followersCount,
        ]);
    }

    private function toggleSimple(
        Request $request,
        string $table,
        array $keyColumns,
        array $keyValues,
        array $insertPayload,
        string $requiredTable
    ): void {
        if (! Schema::hasTable($requiredTable)) {
            abort(422, 'Interaction unavailable');
        }

        $state = $request->boolean('state', true);

        $query = DB::table($table);
        foreach ($keyColumns as $column) {
            $query->where($column, $keyValues[$column]);
        }

        if ($state) {
            if (! $query->exists()) {
                DB::table($table)->insert(array_merge($keyValues, $insertPayload));
            }
        } else {
            $query->delete();
        }
    }

    private function syncArtworkStats(int $artworkId): void
    {
        if (! Schema::hasTable('artwork_stats')) {
            return;
        }

        $favorites = Schema::hasTable('user_favorites')
            ? (int) DB::table('user_favorites')->where('artwork_id', $artworkId)->count()
            : 0;

        $likes = Schema::hasTable('artwork_likes')
            ? (int) DB::table('artwork_likes')->where('artwork_id', $artworkId)->count()
            : 0;

        DB::table('artwork_stats')->updateOrInsert(
            ['artwork_id' => $artworkId],
            [
                'favorites' => $favorites,
                'rating_count' => $likes,
                'updated_at' => now(),
            ]
        );
    }

    private function statusPayload(int $viewerId, int $artworkId): array
    {
        $isFavorited = Schema::hasTable('user_favorites')
            ? DB::table('user_favorites')->where('user_id', $viewerId)->where('artwork_id', $artworkId)->exists()
            : false;

        $isLiked = Schema::hasTable('artwork_likes')
            ? DB::table('artwork_likes')->where('user_id', $viewerId)->where('artwork_id', $artworkId)->exists()
            : false;

        $favorites = Schema::hasTable('user_favorites')
            ? (int) DB::table('user_favorites')->where('artwork_id', $artworkId)->count()
            : 0;

        $likes = Schema::hasTable('artwork_likes')
            ? (int) DB::table('artwork_likes')->where('artwork_id', $artworkId)->count()
            : 0;

        return [
            'ok' => true,
            'is_favorited' => $isFavorited,
            'is_liked' => $isLiked,
            'stats' => [
                'favorites' => $favorites,
                'likes' => $likes,
            ],
        ];
    }
}