@extends('layouts.app')

@section('header')
    <h2 class="font-semibold text-xl text-gray-800 leading-tight">
        {{ __('Performance Analytics') }}
    </h2>
@endsection

@section('content')
<div class="py-12">
    <div class="max-w-7xl mx-auto sm:px-6 lg:px-8">
        <div class="bg-white overflow-hidden shadow-sm sm:rounded-lg shadow">
            <div class="p-6 bg-white border-b border-gray-200">
                <!-- Select Class Form -->
                <form action="{{ route('teacher.analytics.index') }}" method="GET" class="mb-6">
                    <label for="class_id" class="block text-sm font-medium text-gray-700">Select Class</label>
                    <div class="mt-1 flex rounded-md shadow-sm">
                        <select name="class_id" id="class_id" class="flex-1 block w-full rounded-md sm:text-sm border-gray-300">
                            @foreach($myClasses as $class)
                                <option value="{{ $class->id }}" {{ $class->id == $classId ? 'selected' : '' }}>
                                    {{ $class->name }}
                                </option>
                            @endforeach
                        </select>
                        <button type="submit" class="ml-3 inline-flex justify-center py-2 px-4 border border-transparent shadow-sm text-sm font-medium rounded-md text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none">
                            View Analytics
                        </button>
                    </div>
                </form>

                @if($classId && isset($stats) && $stats['totalGrades'] > 0)
                <div class="grid grid-cols-1 md:grid-cols-2 gap-6 mt-8">
                    <!-- Average By Subject Chart -->
                    <div class="bg-gray-50 p-4 rounded-lg shadow-inner">
                        <h3 class="text-lg font-medium text-gray-900 mb-4">Average Scores by Subject</h3>
                        <canvas id="subjectAvgChart"></canvas>
                    </div>

                    <!-- Grade Distribution Chart -->
                    <div class="bg-gray-50 p-4 rounded-lg shadow-inner">
                        <h3 class="text-lg font-medium text-gray-900 mb-4">CBC Grade Distribution</h3>
                        <canvas id="gradeDistChart"></canvas>
                    </div>
                </div>

                <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
                <script>
                    document.addEventListener('DOMContentLoaded', function () {
                        // Subject Averages
                        var subjectCtx = document.getElementById('subjectAvgChart').getContext('2d');
                        var subjectLabels = {!! json_encode($stats['subjectAverages']->pluck('name')) !!};
                        var subjectData = {!! json_encode($stats['subjectAverages']->pluck('avg_score')) !!};
                        
                        new Chart(subjectCtx, {
                            type: 'bar',
                            data: {
                                labels: subjectLabels,
                                datasets: [{
                                    label: 'Average Score',
                                    data: subjectData,
                                    backgroundColor: 'rgba(54, 162, 235, 0.6)',
                                    borderColor: 'rgba(54, 162, 235, 1)',
                                    borderWidth: 1
                                }]
                            },
                            options: {
                                scales: {
                                    y: {
                                        beginAtZero: true,
                                        max: 100
                                    }
                                }
                            }
                        });

                        // Grade Distribution
                        var distCtx = document.getElementById('gradeDistChart').getContext('2d');
                        var distLabels = {!! json_encode(array_keys($stats['distribution'])) !!};
                        var distData = {!! json_encode(array_values($stats['distribution'])) !!};
                        
                        new Chart(distCtx, {
                            type: 'pie',
                            data: {
                                labels: distLabels,
                                datasets: [{
                                    label: 'Number of Grades',
                                    data: distData,
                                    backgroundColor: [
                                        'rgba(75, 192, 192, 0.6)', // E.E
                                        'rgba(54, 162, 235, 0.6)', // M.E
                                        'rgba(255, 206, 86, 0.6)', // A.E
                                        'rgba(255, 99, 132, 0.6)'  // B.E
                                    ],
                                }]
                            }
                        });
                    });
                </script>
                @else
                    <div class="p-4 bg-yellow-50 text-yellow-700 rounded">
                        No grading data available for the selected class to display analytics.
                    </div>
                @endif
            </div>
        </div>
    </div>
</div>
@endsection