// Initialize components on document ready
$(function() {
    initializeUI();
    handleMessageCounts();
    handleFormSubmissions();
    setupTemplateSelections();
    handleClientGroups();
    initializeRecentMessages();
});

// Initialize UI components
function initializeUI() {
    $('[data-toggle="tooltip"]').tooltip();
    $('.select2').select2();
    $('#client_groups').select2({
        placeholder: app.lang.select_client_groups,
        allowClear: true
    });
}

// Handle message character counting
function handleMessageCounts() {
    function updateCharCount(textarea, charCount, msgCount) {
        var chars = $(textarea).val().length;
        $(charCount).text(chars);
        $(msgCount).text(Math.ceil(chars / 160));
    }

    $('#message').on('keyup', function() {
        updateCharCount(this, '#char_count', '#messages_count');
    });

    $('#message_bulk').on('keyup', function() {
        updateCharCount(this, '#char_count_bulk', '#messages_count_bulk');
    });
}

// Handle form submissions
function handleFormSubmissions() {
    $('#sms-form').on('submit', function() {
        var $btn = $('#sendSmsBtn').prop('disabled', true);
        $btn.html('<i class="fa fa-spinner fa-spin"></i> ' + app.lang.sending);
    });

    $('#bulk-sms-form').on('submit', function() {
        if (!confirm(app.lang.bulk_sms_confirm)) {
            return false;
        }
        var $btn = $('#sendBulkSmsBtn').prop('disabled', true);
        $btn.html('<i class="fa fa-spinner fa-spin"></i> ' + app.lang.sending);
    });

    // Handle test SMS
    $('#send_test_sms').on('click', function() {
        handleTestSMS($(this));
    });
}

// Setup template selections
function setupTemplateSelections() {
    function handleTemplateSelection(templateId, messageField, charCount, msgCount) {
        if (templateId) {
            $.get(admin_url + 'hubtel_sms/get_template/' + templateId, function(response) {
                if (response.success) {
                    $(messageField).val(response.template.template);
                    updateCharCount(messageField, charCount, msgCount);
                }
            }, 'json');
        }
    }

    $('#template_id').on('change', function() {
        handleTemplateSelection($(this).val(), '#message', '#char_count', '#messages_count');
    });

    $('#template_id_bulk').on('change', function() {
        handleTemplateSelection($(this).val(), '#message_bulk', '#char_count_bulk', '#messages_count_bulk');
    });
}

// Handle client groups selection
function handleClientGroups() {
    $('#client_groups').on('change', function() {
        var selectedGroups = $(this).val();
        if (selectedGroups) {
            $.get(admin_url + 'hubtel_sms/get_recipients_preview', {
                groups: selectedGroups
            }, function(response) {
                $('#recipients_preview').html(response.html);
                $('#recipients_count').text(response.count);
            }, 'json');
        } else {
            $('#recipients_preview').html('');
            $('#recipients_count').text('0');
        }
    });
}

// Initialize recent messages
function initializeRecentMessages() {
    function loadRecentMessages() {
        $.get(admin_url + 'hubtel_sms/get_recent_messages', function(response) {
            if (response.success) {
                renderRecentMessages(response.messages);
            }
        });
    }

    loadRecentMessages();
    setInterval(loadRecentMessages, 30000);
}

// Modal Functions
function send_sms_modal() {
    $('#send_sms_modal').modal('show');
    $('#send_sms_modal').find('form')[0].reset();
    $('#template_id').val('').trigger('change');
    resetCounters('#char_count', '#messages_count');
}

function bulk_sms_modal() {
    $('#bulk_sms_modal').modal('show');
    $('#bulk_sms_modal').find('form')[0].reset();
    $('#client_groups').val('').trigger('change');
    $('#template_id_bulk').val('').trigger('change');
    resetCounters('#char_count_bulk', '#messages_count_bulk');
    $('#recipients_preview').html('');
    $('#recipients_count').text('0');
}

function view_message(id) {
    showLoadingModal('#message_details', '#view_message_modal');
    $.get(admin_url + 'hubtel_sms/view_message/' + id, function(response) {
        $('#message_details').html(response);
    });
}

function preview_template(id) {
    showLoadingModal('#template_preview', '#preview_template_modal');
    $.get(admin_url + 'hubtel_sms/preview_template/' + id, function(response) {
        $('#template_preview').html(response);
    });
}

// Helper Functions
function resetCounters(charCount, msgCount) {
    $(charCount).text('0');
    $(msgCount).text('1');
}

function showLoadingModal(contentSelector, modalSelector) {
    $(contentSelector).html('<div class="text-center"><i class="fa fa-spinner fa-spin fa-2x"></i></div>');
    $(modalSelector).modal('show');
}

function handleTestSMS($btn) {
    var number = $('#test_number').val();
    
    if (!number) {
        alert_float('warning', app.lang.enter_phone_number);
        return;
    }

    $btn.prop('disabled', true)
        .html('<i class="fa fa-spinner fa-spin"></i> ' + app.lang.sending);

    $.post(admin_url + 'hubtel_sms/send_test', {
        number: number
    }, function(response) {
        handleTestSMSResponse(response, $btn);
    }).fail(function(xhr, status, error) {
        alert_float('danger', 'Failed to send test SMS: ' + error);
        resetTestButton($btn);
    });
}

function handleTestSMSResponse(response, $btn) {
    if (response.success) {
        alert_float('success', response.message);
        $('#test_number').val('');
    } else {
        alert_float('danger', response.message);
    }
    resetTestButton($btn);
}

function resetTestButton($btn) {
    $btn.prop('disabled', false).html(app.lang.send_test_sms);
}

function resend_sms(id) {
    if (confirm(app.lang.confirm_action_prompt)) {
        $.get(admin_url + 'hubtel_sms/resend/' + id, function(response) {
            if (response.success) {
                alert_float('success', response.message);
                location.reload();
            } else {
                alert_float('danger', response.message);
            }
        }, 'json');
    }
}

function formatCurrency(amount) {
    return app.options.currency_symbol + parseFloat(amount).toFixed(2);
}

function renderRecentMessages(messages) {
    var html = messages.map(function(message) {
        return `
            <tr>
                <td>${moment(message.date_sent).format('YYYY-MM-DD HH:mm')}</td>
                <td>
                    <span class="label label-${message.status === 'sent' ? 'success' : 'danger'}">
                        ${message.status}
                    </span>
                </td>
                <td>${message.rate ? formatCurrency(message.rate) : '-'}</td>
            </tr>
        `;
    }).join('');
    $('#recent_messages').html(html);
}