/**
 * Toast Notification System
 * Provides consistent, user-friendly notifications across the application
 * Uses Toastr library with Bootstrap 5 theming
 */

// Configure Toastr global options
toastr.options = {
    "closeButton": true,
    "debug": false,
    "newestOnTop": true,
    "progressBar": true,
    "positionClass": "toast-top-right",
    "preventDuplicates": true,
    "onclick": null,
    "showDuration": "300",
    "hideDuration": "1000",
    "timeOut": "5000",
    "extendedTimeOut": "1000",
    "showEasing": "swing",
    "hideEasing": "linear",
    "showMethod": "fadeIn",
    "hideMethod": "fadeOut"
};

/**
 * Show success toast notification
 * @param {string} message - The success message to display
 * @param {string} title - Optional title for the toast
 */
function showSuccess(message, title = 'Success') {
    toastr.success(message, title);
}

/**
 * Show error toast notification
 * @param {string} message - The error message to display
 * @param {string} title - Optional title for the toast
 */
function showError(message, title = 'Error') {
    toastr.error(message, title);
}

/**
 * Show warning toast notification
 * @param {string} message - The warning message to display
 * @param {string} title - Optional title for the toast
 */
function showWarning(message, title = 'Warning') {
    toastr.warning(message, title);
}

/**
 * Show info toast notification
 * @param {string} message - The info message to display
 * @param {string} title - Optional title for the toast
 */
function showInfo(message, title = 'Info') {
    toastr.info(message, title);
}

/**
 * Show validation errors from ModelState
 * @param {Array<string>} errors - Array of validation error messages
 */
function showValidationErrors(errors) {
    if (!errors || errors.length === 0) return;

    // If single error, show it directly
    if (errors.length === 1) {
        showError(errors[0], 'Validation Error');
        return;
    }

    // Multiple errors - show as a list
    const errorList = '<ul class="mb-0 ps-3">' +
        errors.map(err => `<li>${escapeHtml(err)}</li>`).join('') +
        '</ul>';

    toastr.error(errorList, `${errors.length} Validation Errors`, {
        timeOut: 8000,
        extendedTimeOut: 2000
    });
}

/**
 * Display TempData messages automatically on page load
 * Expects TempData keys: Success, Error, Warning, Info
 */
function displayTempDataMessages() {
    // Success message
    const successMsg = document.getElementById('tempdata-success-message');
    if (successMsg && successMsg.textContent.trim()) {
        showSuccess(successMsg.textContent.trim());
    }

    // Error message
    const errorMsg = document.getElementById('tempdata-error-message');
    if (errorMsg && errorMsg.textContent.trim()) {
        showError(errorMsg.textContent.trim());
    }

    // Permanent success — no auto-dismiss
    const successPerm = document.getElementById('tempdata-success-permanent-message');
    if (successPerm && successPerm.textContent.trim()) {
        toastr.success(successPerm.textContent.trim(), 'Success', { timeOut: 0, extendedTimeOut: 0 });
    }

    // Permanent error — no auto-dismiss
    const errorPerm = document.getElementById('tempdata-error-permanent-message');
    if (errorPerm && errorPerm.textContent.trim()) {
        toastr.error(errorPerm.textContent.trim(), 'Error', { timeOut: 0, extendedTimeOut: 0 });
    }

    // Warning message
    const warningMsg = document.getElementById('tempdata-warning-message');
    if (warningMsg && warningMsg.textContent.trim()) {
        showWarning(warningMsg.textContent.trim());
    }

    // Info message
    const infoMsg = document.getElementById('tempdata-info-message');
    if (infoMsg && infoMsg.textContent.trim()) {
        showInfo(infoMsg.textContent.trim());
    }
}

/**
 * Display ModelState validation errors on page load
 * Expects a hidden div with id 'modelstate-errors' containing JSON array of errors
 */
function displayModelStateErrors() {
    const errorContainer = document.getElementById('modelstate-errors');
    if (errorContainer && errorContainer.textContent.trim()) {
        try {
            const errors = JSON.parse(errorContainer.textContent);
            showValidationErrors(errors);
        } catch (e) {
            console.error('Failed to parse ModelState errors:', e);
        }
    }
}

/**
 * Escape HTML to prevent XSS
 * @param {string} text - Text to escape
 * @returns {string} - Escaped text
 */
function escapeHtml(text) {
    const div = document.createElement('div');
    div.textContent = text;
    return div.innerHTML;
}

/**
 * Clear all toasts
 */
function clearAllToasts() {
    toastr.clear();
}

// Auto-initialize on page load
document.addEventListener('DOMContentLoaded', function() {
    displayTempDataMessages();
    displayModelStateErrors();
});

// Make functions globally available
window.showSuccess = showSuccess;
window.showError = showError;
window.showWarning = showWarning;
window.showInfo = showInfo;
window.showValidationErrors = showValidationErrors;
window.clearAllToasts = clearAllToasts;