// CSV Bulk Import JavaScript
// Handles file upload with AJAX, progress indicators, and result display

document.addEventListener('DOMContentLoaded', function () {
    setupCsvImportForm('csvImportCustomersForm', 'csvCustomersFile', 'csvImportCustomersBtn', '/Tools/CsvImportCustomers', 'csvCustomersResults');
    setupCsvImportForm('csvImportCatalogForm', 'csvCatalogFile', 'csvImportCatalogBtn', '/Tools/CsvImportCatalogItems', 'csvCatalogResults');
    setupCsvImportForm('csvImportInventoryForm', 'csvInventoryFile', 'csvImportInventoryBtn', '/Tools/CsvImportInventoryItems', 'csvInventoryResults');
    setupCsvImportForm('csvImportQuotesForm', 'csvQuotesFile', 'csvImportQuotesBtn', '/Tools/CsvImportQuotes', 'csvQuotesResults');
    setupCsvImportForm('csvImportJobsForm', 'csvJobsFile', 'csvImportJobsBtn', '/Tools/CsvImportJobs', 'csvJobsResults');
    setupCsvImportForm('csvImportAppointmentsForm', 'csvAppointmentsFile', 'csvImportAppointmentsBtn', '/Tools/CsvImportAppointments', 'csvAppointmentsResults');
    setupCsvImportForm('csvImportEquipmentForm', 'csvEquipmentFile', 'csvImportEquipmentBtn', '/Tools/CsvImportEquipment', 'csvEquipmentResults');
    setupCsvImportForm('csvImportMaintenanceForm', 'csvMaintenanceFile', 'csvImportMaintenanceBtn', '/Tools/CsvImportMaintenance', 'csvMaintenanceResults');
    setupCsvImportForm('csvImportSettingsForm', 'csvSettingsFile', 'csvImportSettingsBtn', '/Tools/CsvImportCompanySettings', 'csvSettingsResults');
    setupCsvImportForm('csvImportVendorsForm', 'csvVendorsFile', 'csvImportVendorsBtn', '/Tools/CsvImportVendors', 'csvVendorsResults');
    setupCsvImportForm('csvImportShopWorkersForm', 'csvShopWorkersFile', 'csvImportShopWorkersBtn', '/Tools/CsvImportShopWorkers', 'csvShopWorkersResults');
    setupCsvImportForm('csvImportPrepServicesForm', 'csvPrepServicesFile', 'csvImportPrepServicesBtn', '/Tools/CsvImportPrepServices', 'csvPrepServicesResults');
});

function setupCsvImportForm(formId, fileInputId, submitBtnId, actionUrl, resultsId) {
    const form = document.getElementById(formId);
    if (!form) return;

    form.addEventListener('submit', async function (e) {
        e.preventDefault();

        const fileInput = document.getElementById(fileInputId);
        const submitBtn = document.getElementById(submitBtnId);
        const resultsDiv = document.getElementById(resultsId);
        const spinner = submitBtn.querySelector('.spinner-border');

        // Validate file selection
        if (!fileInput.files || fileInput.files.length === 0) {
            showToast('Please select a CSV file to import.', 'error');
            return;
        }

        const file = fileInput.files[0];

        // Validate file extension
        if (!file.name.toLowerCase().endsWith('.csv')) {
            showToast('Please select a valid CSV file.', 'error');
            return;
        }

        // Validate file size (max 10MB)
        const maxSize = 10 * 1024 * 1024; // 10MB
        if (file.size > maxSize) {
            showToast('File size must be less than 10MB.', 'error');
            return;
        }

        // Show loading state
        spinner.classList.remove('d-none');
        submitBtn.disabled = true;
        resultsDiv.classList.add('d-none');
        resultsDiv.innerHTML = '';

        // Prepare form data (use the form element so all fields, including account selects, are included)
        const formData = new FormData(form);

        // Get anti-forgery token
        const token = document.querySelector('input[name="__RequestVerificationToken"]').value;

        try {
            const response = await fetch(actionUrl, {
                method: 'POST',
                body: formData,
                headers: {
                    'RequestVerificationToken': token
                }
            });

            const result = await response.json();

            // Display results
            displayImportResults(result, resultsDiv);

            // Show toast notification
            if (result.success) {
                showToast(`Import completed: ${result.successCount} records imported successfully!`, 'success');
                // Clear file input
                fileInput.value = '';
            } else {
                showToast('Import completed with errors. Please review the details below.', 'error');
            }

        } catch (error) {
            console.error('Import error:', error);
            showToast('An error occurred during import: ' + error.message, 'error');
            displayImportResults({ success: false, message: error.message, errors: [error.toString()] }, resultsDiv);
        } finally {
            // Hide loading state
            spinner.classList.add('d-none');
            submitBtn.disabled = false;
        }
    });
}

function displayImportResults(result, resultsDiv) {
    resultsDiv.classList.remove('d-none');

    const cardClass = result.success ? 'border-success' : 'border-danger';
    const headerClass = result.success ? 'bg-success' : 'bg-danger';
    const icon = result.success ? 'check-circle' : 'exclamation-triangle';

    const skipped = result.skippedCount || 0;
    const colSize = skipped > 0 ? 'col-md-3' : 'col-md-4';

    let html = `
        <div class="card ${cardClass}">
            <div class="card-header ${headerClass} text-white">
                <h6 class="mb-0"><i class="bi bi-${icon}"></i> Import Results</h6>
            </div>
            <div class="card-body">
                <div class="row mb-3">
                    <div class="${colSize}">
                        <div class="text-center">
                            <div class="display-6 text-success">${result.successCount || 0}</div>
                            <small class="text-muted">Imported</small>
                        </div>
                    </div>
                    ${skipped > 0 ? `
                    <div class="${colSize}">
                        <div class="text-center">
                            <div class="display-6 text-warning">${skipped}</div>
                            <small class="text-muted">Skipped (already exist)</small>
                        </div>
                    </div>` : ''}
                    <div class="${colSize}">
                        <div class="text-center">
                            <div class="display-6 text-danger">${result.errorCount || 0}</div>
                            <small class="text-muted">Errors</small>
                        </div>
                    </div>
                    <div class="${colSize}">
                        <div class="text-center">
                            <div class="display-6 text-info">${result.totalRows || 0}</div>
                            <small class="text-muted">Total Rows</small>
                        </div>
                    </div>
                </div>
                <p class="mb-2"><strong>${result.message || 'Import completed.'}</strong></p>
    `;

    // Display errors
    if (result.errors && result.errors.length > 0) {
        html += `
                <div class="alert alert-danger mt-3">
                    <h6><i class="bi bi-exclamation-triangle"></i> Errors:</h6>
                    <ul class="mb-0 small">
        `;
        result.errors.forEach(error => {
            html += `<li>${escapeHtml(error)}</li>`;
        });
        html += `
                    </ul>
                </div>
        `;
    }

    // Display warnings
    if (result.warnings && result.warnings.length > 0) {
        html += `
                <div class="alert alert-warning mt-3">
                    <h6><i class="bi bi-info-circle"></i> Warnings:</h6>
                    <ul class="mb-0 small">
        `;
        result.warnings.forEach(warning => {
            html += `<li>${escapeHtml(warning)}</li>`;
        });
        html += `
                    </ul>
                </div>
        `;
    }

    html += `
            </div>
        </div>
    `;

    resultsDiv.innerHTML = html;
}

function showToast(message, type = 'success') {
    const toastId = type === 'success' ? 'successToast' : 'errorToast';
    const toastElement = document.getElementById(toastId);
    if (!toastElement) return;

    const toastBody = toastElement.querySelector('.toast-body');
    toastBody.textContent = message;

    const toast = new bootstrap.Toast(toastElement, {
        autohide: true,
        delay: 5000
    });
    toast.show();
}

function escapeHtml(text) {
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
}