<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\CourseAssignment;
use App\Models\Course;
use App\Models\User;
use App\Models\Group;
use App\Models\Organization;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Gate;
use Illuminate\Support\Facades\DB;

class CourseAssignmentController extends Controller
{
    public function __construct()
    {
        $this->middleware('auth');
    }

    public function index(Request $request)
    {
        Gate::authorize('viewAny', CourseAssignment::class);
        
        $query = CourseAssignment::with(['course', 'user', 'group', 'organization', 'creator']);
        
        if ($request->filled('course_id')) {
            $query->where('course_id', $request->course_id);
        }
        
        if ($request->filled('type')) {
            $query->where('type', $request->type);
        }
        
        $assignments = $query->orderBy('created_at', 'desc')->paginate(20);
        $courses = Course::pluck('title', 'id');
        
        return view('admin.course-assignments.index', compact('assignments', 'courses'));
    }

    public function create()
    {
        Gate::authorize('create', CourseAssignment::class);
        
        $courses = Course::pluck('title', 'id');
        $users = User::pluck('name', 'id');
        $groups = Group::pluck('name', 'id');
        $organizations = Organization::pluck('name', 'id');
        
        return view('admin.course-assignments.create', compact('courses', 'users', 'groups', 'organizations'));
    }

    public function store(Request $request)
    {
        Gate::authorize('create', CourseAssignment::class);
        
        $validated = $request->validate([
            'course_id' => 'required|exists:courses,id',
            'type' => 'required|in:individual,group,organization',
            'user_id' => 'nullable|exists:users,id',
            'group_id' => 'nullable|exists:groups,id',
            'organization_id' => 'nullable|exists:organizations,id',
            'start_date' => 'required|date',
            'end_date' => 'nullable|date|after:start_date',
            'note' => 'nullable|string',
            'is_active' => 'boolean',
        ]);
        
        $validated['created_by'] = auth()->id();
        $validated['is_active'] = $request->boolean('is_active');
        
        CourseAssignment::create($validated);
        
        return redirect()->route('admin.course-assignments.index')
            ->with('success', 'Назначение успешно создано.');
    }

    public function show(CourseAssignment $assignment)
    {
        Gate::authorize('view', $assignment);
        
        $assignment->load(['course', 'user', 'group', 'organization', 'creator']);
        
        return view('admin.course-assignments.show', compact('assignment'));
    }

    public function edit(CourseAssignment $assignment)
    {
        Gate::authorize('update', $assignment);
        
        $courses = Course::pluck('title', 'id');
        $users = User::pluck('name', 'id');
        $groups = Group::pluck('name', 'id');
        $organizations = Organization::pluck('name', 'id');
        
        return view('admin.course-assignments.edit', compact('assignment', 'courses', 'users', 'groups', 'organizations'));
    }

    public function update(Request $request, CourseAssignment $assignment)
    {
        Gate::authorize('update', $assignment);
        
        $validated = $request->validate([
            'course_id' => 'required|exists:courses,id',
            'type' => 'required|in:individual,group,organization',
            'user_id' => 'nullable|exists:users,id',
            'group_id' => 'nullable|exists:groups,id',
            'organization_id' => 'nullable|exists:organizations,id',
            'start_date' => 'required|date',
            'end_date' => 'nullable|date|after:start_date',
            'note' => 'nullable|string',
            'is_active' => 'boolean',
        ]);
        
        $assignment->update($validated);
        
        return redirect()->route('admin.course-assignments.show', $assignment)
            ->with('success', 'Назначение успешно обновлено.');
    }

    public function destroy(CourseAssignment $assignment)
    {
        Gate::authorize('delete', $assignment);
        
        $assignment->delete();
        
        return redirect()->route('admin.course-assignments.index')
            ->with('success', 'Назначение успешно удалено.');
    }
}