<?php

namespace App\Http\Controllers;

use App\Models\Deadline;
use App\Models\UserDeadline;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class DeadlineController extends Controller
{
    public function index()
    {
        $userId = Auth::id();

        $deadlines = Deadline::with(['bookRecommendation' => function ($query) {
            $query->where('status', 'active');
        }, 'userDeadlines'])
            ->get();


        $deadlines->each(function ($deadline) use ($userId) {
            UserDeadline::firstOrCreate([
                'user_id' => $userId,
                'deadline_id' => $deadline->id,
            ], [
                'completed_at' => null, // Default value, indicating not completed
            ]);
        });

        $deadlinesWithAllUserProgress = Deadline::with(['bookRecommendation', 'userDeadlines.user'])
            ->get();

        return response()->json($deadlinesWithAllUserProgress);
    }

    public function deadlinesByBookRecommendation($bookRecommendationId)
    {
        $userId = Auth::id();
        $refetch = false;

        $deadlines = Deadline::with(['userDeadlines' => function ($query) use ($userId) {
            $query->where('user_id', $userId);
        }, 'userDeadlines.user'])
            ->where('book_recommendation_id', $bookRecommendationId)
            ->get();

        $deadlines->each(function ($deadline) use ($userId, &$refetch) {
            UserDeadline::firstOrCreate([
                'user_id' => $userId,
                'deadline_id' => $deadline->id,
            ], [
                'completed_at' => null, // Default to not completed.
            ]);
            $refetch = true;
        });

        if ($refetch) {
            $deadlines = Deadline::with(['userDeadlines' => function ($query) use ($userId) {
                $query->where('user_id', $userId);
            }, 'userDeadlines.user'])
                ->where('book_recommendation_id', $bookRecommendationId)
                ->get();
        }

        return response()->json($deadlines);
    }

    public function createDeadline(Request $request)
    {
        $validated = $request->validate([
            'book_recommendation_id' => 'required|integer|exists:book_recommendations,id',
            'deadline' => 'required|date',
            'target_page' => 'nullable|integer',
            'target_chapter' => 'nullable|string|max:255',
        ]);

        if (!(auth()->user()->hasRole('admin')) ) {
            return response()->json(['message' => 'Keine Berechtigung.'], 403);
        }

        $deadline = new Deadline($validated);
        $deadline->save();

        return response()->json([
            'message' => 'Deadline created successfully.',
            'deadline' => $deadline,
        ], 201);
    }


    public function updateUserDeadline(Request $request, $deadlineId)
    {
        $userId = Auth::id();
        $userDeadline = UserDeadline::where('deadline_id', $deadlineId)
            ->where('user_id', $userId)
            ->firstOrFail();

        $userDeadline->completed_at = now(); // Mark as completed
        $userDeadline->save();

        return response()->json(['message' => 'Deadline marked as completed successfully.']);
    }
}