{{-- Upload Handler — gerencia o fluxo de drop/captura de arquivo e envio --}}
const handleDirectDroppedFile = (file) => {
    var isImage = file && file.type.startsWith('image/');
    var isAudio = file && (file.type.startsWith('audio/') || ['application/ogg', 'application/x-cdf'].indexOf(file.type) !== -1);
    var isExcel = file && (file.name.endsWith('.xlsx') || file.name.endsWith('.xls') || file.name.endsWith('.csv') || file.type.indexOf('spreadsheet') !== -1 || file.type.indexOf('excel') !== -1);
    var isPdf = file && file.type === 'application/pdf';

    fileToUpload = file;

    /* Oculta feedbacks anteriores */
    $('#gallery-audio-wrapper-' + pickerId).hide();
    $('#gallery-excel-wrapper-' + pickerId).hide();
    $('#gallery-document-wrapper-' + pickerId).hide();
    $('#gallery-cropper-wrapper-' + pickerId).hide();

    /* Pré-preenche a descrição com o nome do arquivo */
    $('#upload-media-desc-' + pickerId).val(file.name);

    if (isImage) {
        /* Interface com Cropper para imagens */
        var reader = new FileReader();
        reader.onload = function(event) {
            var $cropImage = $('#gallery-cropper-image-' + pickerId);
            $cropImage.attr('src', event.target.result);

            $('#upload-fields-container-' + pickerId).hide();
            $('#gallery-cropper-wrapper-' + pickerId).show();
            $('#btn-register-upload-' + pickerId).show();

            if (cropperInstance) {
                cropperInstance.destroy();
            }
            cropperInstance = new Cropper($cropImage[0], {
                viewMode: 1,
                autoCropArea: 1,
                responsive: true
            });
        };
        reader.readAsDataURL(file);
    } else {
        /* Não-imagem: oculta dropzone, mostra feedback e botão Registrar */
        $('#upload-fields-container-' + pickerId).hide();
        $('#btn-register-upload-' + pickerId).show();

        if (isAudio) {
            $('#gallery-audio-filename-' + pickerId).text(file.name + ' (' + (file.size / 1024 / 1024).toFixed(2) + ' MB)');
            $('#gallery-audio-wrapper-' + pickerId).show();
        } else if (isExcel) {
            $('#gallery-excel-filename-' + pickerId).text(file.name + ' (' + (file.size / 1024).toFixed(2) + ' KB)');
            $('#gallery-excel-wrapper-' + pickerId).show();
        } else {
            $('#gallery-document-filename-' + pickerId).text(file.name + ' (' + (file.size / 1024 / 1024).toFixed(2) + ' MB)');
            $('#gallery-document-wrapper-' + pickerId).show();
        }
    }
};

const performUpload = (file) => {
    var altText = $('#upload-media-alt-' + pickerId).val();
    var desc = $('#upload-media-desc-' + pickerId).val();
    var isShared = $('#upload-media-shared-' + pickerId).is(':checked') ? '1' : '0';

    var formData = new FormData();
    formData.append('file', file);
    formData.append('owner_module', ownerModule);
    formData.append('is_shared', isShared);
    formData.append('file_alt', altText);
    formData.append('description', desc);
    formData.append('allowed_mime_types', filterMimeTypes);
    formData.append('_token', csrfToken);

    $.ajax({
        url: urls.store,
        type: 'POST',
        data: formData,
        processData: false,
        contentType: false,
        headers: {
            'X-CSRF-TOKEN': csrfToken
        },
        success: function(anexo) {
            selectMedia(anexo.id, '/storage/' + anexo.file_path, anexo.alt_text, anexo.mime_type || '', anexo.description || '');
            if (typeof toastr !== 'undefined') toastr.success('Upload concluído!');

            /* Reseta o input file para permitir novos uploads */
            var container = document.getElementById('upload-drop-segment-' + pickerId);
            var fileInput = container ? container.querySelector('#media-input-gallery_file_' + pickerId) : null;
            if (fileInput) {
                fileInput.value = '';
            }
            destroyCropper();
        },
        error: function(xhr) {
            var msg = xhr.responseJSON && xhr.responseJSON.message ? xhr.responseJSON.message : 'Erro ao realizar upload.';
            if (typeof toastr !== 'undefined') toastr.error(msg);
        }
    });
};

/* Escuta alteração do input file interno do dropzone */
$(document).on('change', '#media-input-gallery_file_' + pickerId, function(e) {
    var file = e.target.files[0];
    if (file) {
        handleDirectDroppedFile(file);
    }
});