@extends('layouts.app')
@section('content')
    @include('layouts.navbars.auth.topnav', ['title' => 'Student Attendance'])
    <div class="row mt-4 mx-4">
        <div class="col-12">
            <div class="card mb-4">
                <div class="d-flex align-items-center">
                    <p class="mb-0 ms-2 mt-2">Student Attendance</p>
                </div>
                <div class="card-body px-0 pt-0 pb-2">
                    <div class="table-responsive p-0">
                        <div class="card-body">
                            <div class="row align-items-end">
                                <div class="col-md-3">
                                    <div class="form-group">
                                        <label for="date">Date</label>
                                        <input type="text" id="daterange" name="date" class="form-control" required>
                                    </div>
                                </div>
                                <div class="col-md-3">
                                    <div class="form-group">
                                        <label for="class">Class</label>
                                        <select name="class" id="class" class="form-select select2" required>
                                            <option value="">Select Class</option>
                                            @foreach ($classes as $class)
                                                <option value="{{ $class->cms_class_sid }}">{{ $class->class_name }}
                                                </option>
                                            @endforeach
                                        </select>
                                    </div>
                                </div>
                                <div class="col-md-3">
                                    <div class="form-group">
                                        <label for="class">Student</label>
                                        <select name="student" id="student" class="form-select select2" required>
                                            <option value="all" disabled selected>Select All</option>
                                        </select>
                                    </div>
                                </div>
                                <div class="col-md-3 d-flex">
                                    <button type="submit" class="btn btn-primary" id="check_attendance_button">Find</button>
                                </div>
                            </div>
                            <hr>
                            <div id="studentsTableContainer"></div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
@endsection
@push('scripts')

    <script>
        $(document).ready(function () {
            // Initialize the daterangepicker
            $('#daterange').daterangepicker({
                locale: { format: 'YYYY-MM-DD' },
                autoUpdateInput: false,
                showDropdowns: true,
                opens: 'right'
            });

            let startDate, endDate, class_id;

            $('#daterange').on('apply.daterangepicker', function (ev, picker) {
                startDate = picker.startDate.format('YYYY-MM-DD');
                endDate = picker.endDate.format('YYYY-MM-DD');
                $(this).val(startDate + ' to ' + endDate);
            });

            $('#class').on('change', function () {
                class_id = $(this).val();
            });

            var student_id = "all";
            $('#student').on('change', function () {
                student_id = $(this).val();
            });

            $('#check_attendance_button').on('click', function () {
                console.log(student_id);
                // Check if all required fields are selected
                if (startDate && endDate && class_id) {
                    $.ajax({
                        url: '/get-studentAttendance-view',
                        method: 'GET',
                        data: {
                            start_date: startDate,
                            end_date: endDate,
                            class_id: class_id,
                            student_id: student_id
                        },
                        success: function (response) {
                            // Check if the response contains valid data
                            if (response && Array.isArray(response.student_attendance) && response.student_attendance.length > 0) {
                                const hour = response.hours; // Total number of periods

                                // Start building the table HTML
                                let tableHtml = `
                                                                                                                                                                                                                                                                                        <table class="table table-bordered">
                                                                                                                                                                                                                                                                                            <thead>
                                                                                                                                                                                                                                                                                                <tr>                            
                                                                                                                                                                                                                                                                                                    <th class="text-center">Attendance Date</th>
                                                                                                                                                                                                                                                                                                    <th class="text-center">Student ID</th>
                                                                                                                                                                                                                                                                                                    <th class="text-center">Name</th>`;

                                // Add columns for each period
                                for (let i = 1; i <= hour; i++) {
                                    tableHtml += `<th class="text-center">Period ${i}</th>`;
                                }

                                tableHtml += `</tr></thead><tbody>`;

                                // Group attendance by date first, then by student ID
                                const groupedByDate = {};
                                response.student_attendance.forEach(record => {
                                    const studentId = record.cms_student_sid;
                                    const studentName = record.student.firstname;

                                    // Format the attendance date to d-m-Y
                                    const attendanceDate = new Date(record.attendance_date).toLocaleDateString('en-GB', {
                                        day: '2-digit',
                                        month: '2-digit',
                                        year: 'numeric'
                                    });

                                    const period = record.period;
                                    const status = record.status;

                                    // Initialize the date entry if not present
                                    if (!groupedByDate[attendanceDate]) {
                                        groupedByDate[attendanceDate] = [];
                                    }

                                    // Find the student in the date group or create a new entry
                                    let studentEntry = groupedByDate[attendanceDate].find(student => student.id === studentId);
                                    if (!studentEntry) {
                                        studentEntry = {
                                            id: studentId,
                                            name: studentName,
                                            periods: {}
                                        };
                                        groupedByDate[attendanceDate].push(studentEntry);
                                    }

                                    // Assign the status for the period
                                    studentEntry.periods[period] = status;
                                });

                                // Loop through the grouped attendance to generate the rows
                                let rowIndex = 1;
                                Object.keys(groupedByDate).forEach(date => {
                                    // Loop through students for this date
                                    groupedByDate[date].forEach((student, studentIndex) => {
                                        tableHtml += `
                                                                                                                                                                                                                                                                                                <tr>
                                                                                                                                                                                                                                                                                                    `;
                                        // Add colspan for the attendance date in the first row only
                                        if (studentIndex === 0) {
                                            tableHtml += `
                                                                                                                                                                                                                                                                                                   <td class="text-center align-middle" rowspan="${groupedByDate[date].length}">${date}</td>`;
                                        }

                                        tableHtml += `
                                                                                                                                                                                                                                                                                                    <td class="text-center">${student.id}</td>
                                                                                                                                                                                                                                                                                                    <td class="text-center">${student.name}</td>`;

                                        // Generate icons for each period
                                        for (let i = 1; i <= hour; i++) {
                                            const status = student.periods[i] || ''; // Default to empty if no data is available
                                            const icon = status === 'present' ? 'fa-check-circle text-success' : (status === 'absent' ? 'fa-times-circle text-danger' : '');
                                            tableHtml += `
                                                                                                                                                                                                                                                                                                    <td class="text-center">
                                                                                                                                                                                                                                                                                                        <i class="fas ${icon} fa-1x"></i> 
                                                                                                                                                                                                                                                                                                    </td>`;
                                        }

                                        tableHtml += `</tr>`;
                                        rowIndex++;
                                    });
                                });

                                tableHtml += `</tbody></table>`;

                                // Append the table to the container
                                $('#studentsTableContainer').html(tableHtml);
                            } else {
                                // If no students are returned, show a message
                                $('#studentsTableContainer').html('<p>No attendance records found for the selected criteria.</p>');
                            }
                        },
                        error: function (xhr, status, error) {
                            console.error("Error fetching attendance data:", error);
                            $('#studentsTableContainer').html('<p>Error fetching data. Please try again.</p>');
                        }
                    });
                } else {
                    alert("Please select both a class and a date range.");
                }
            });

            $('#daterange').on('cancel.daterangepicker', function () {
                $(this).val('');
            });
        });
    </script>
    <script>
        $('#class').on('change', function () {
            class_id = $(this).val();
            $.ajax({
                url: '/get-class-student',
                method: 'GET',
                data: {
                    class_id: class_id
                },
                success: function (response) {
                    console.log(response);
                    $('#student').empty();

                    $('#student').append('<option value="all"selected>All-Student</option>');

                    if (response.student && Array.isArray(response.student)) {
                        response.student.forEach(student => {
                            const optionText = `${student.register_no} - ${student.firstname} ${student.lastname}`;

                            const option = `<option value="${student.cms_student_sid}">${optionText}</option>`;

                            $('#student').append(option);
                        });
                    }
                    $('#student').select2();
                }, error: function (xhr, status, error) {
                    console.error("Error fetching attendance data:", error);
                    // $('#studentsTableContainer').html('<p>Error fetching data. Please try again.</p>');
                }
            });
        });
    </script>


@endpush