/**
 * WP Prometheus Admin JavaScript
 *
 * @package WP_Prometheus
 */

(function($) {
    'use strict';

    var importFileContent = null;

    $(document).ready(function() {
        // License tab handlers.
        initLicenseHandlers();

        // Custom metrics tab handlers.
        initCustomMetricsHandlers();

        // Dashboards tab handlers.
        initDashboardsHandlers();

        // Runtime metrics reset handler.
        initResetRuntimeHandler();
    });

    /**
     * Initialize license tab handlers.
     */
    function initLicenseHandlers() {
        // Validate license button.
        $('#wp-prometheus-validate-license').on('click', function(e) {
            e.preventDefault();
            performLicenseAction('wp_prometheus_validate_license', 'Validating...');
        });

        // Activate license button.
        $('#wp-prometheus-activate-license').on('click', function(e) {
            e.preventDefault();
            performLicenseAction('wp_prometheus_activate_license', 'Activating...');
        });

        // Regenerate token button.
        $('#wp-prometheus-regenerate-token').on('click', function(e) {
            e.preventDefault();
            if (confirm(wpPrometheus.confirmRegenerateToken)) {
                var newToken = generateToken(32);
                $('#wp_prometheus_auth_token').val(newToken);
            }
        });
    }

    /**
     * Initialize custom metrics tab handlers.
     */
    function initCustomMetricsHandlers() {
        var $formContainer = $('#wp-prometheus-metric-form-container');
        var $form = $('#wp-prometheus-metric-form');
        var $showFormBtn = $('#show-metric-form');

        // Show metric form.
        $showFormBtn.on('click', function() {
            resetMetricForm();
            $formContainer.slideDown();
            $(this).hide();
        });

        // Cancel metric form.
        $('#cancel-metric-form').on('click', function() {
            $formContainer.slideUp();
            $showFormBtn.show();
            // Remove edit parameter from URL.
            if (window.location.search.indexOf('edit=') > -1) {
                window.history.pushState({}, '', window.location.pathname + '?page=wp-prometheus&tab=custom');
            }
        });

        // Value type toggle.
        $('input[name="value_type"]').on('change', function() {
            var valueType = $(this).val();
            if (valueType === 'option') {
                $('#option-config-row').show();
                $('#static-values-row').hide();
            } else {
                $('#option-config-row').hide();
                $('#static-values-row').show();
            }
        });

        // Add label.
        $('#add-label').on('click', function() {
            var $container = $('#metric-labels-container');
            var labelCount = $container.find('.metric-label-row').length;

            if (labelCount >= 5) {
                alert('Maximum 5 labels allowed per metric.');
                return;
            }

            var $row = $('<div class="metric-label-row">' +
                '<input type="text" name="labels[]" class="regular-text" placeholder="label_name" pattern="[a-zA-Z_][a-zA-Z0-9_]*">' +
                '<button type="button" class="button remove-label">&times;</button>' +
                '</div>');
            $container.append($row);
            updateValueRows();
        });

        // Remove label.
        $(document).on('click', '.remove-label', function() {
            $(this).closest('.metric-label-row').remove();
            updateValueRows();
        });

        // Add value row.
        $('#add-value-row').on('click', function() {
            var $container = $('#metric-values-container');
            var rowCount = $container.find('.metric-value-row').length;
            var labelCount = getLabelCount();

            var $row = $('<div class="metric-value-row"></div>');

            // Add label value inputs.
            var labels = getLabels();
            for (var i = 0; i < labelCount; i++) {
                $row.append('<input type="text" name="label_values[' + rowCount + '][]" class="small-text" placeholder="' + (labels[i] || 'value') + '">');
            }

            // Add metric value input.
            $row.append('<input type="number" name="label_values[' + rowCount + '][]" class="small-text" step="any" placeholder="Value">');
            $row.append('<button type="button" class="button remove-value-row">&times;</button>');

            $container.append($row);
        });

        // Remove value row.
        $(document).on('click', '.remove-value-row', function() {
            $(this).closest('.metric-value-row').remove();
        });

        // Submit metric form.
        $form.on('submit', function(e) {
            e.preventDefault();
            saveCustomMetric();
        });

        // Delete metric.
        $(document).on('click', '.delete-metric', function() {
            var id = $(this).data('id');
            if (confirm(wpPrometheus.confirmDelete)) {
                deleteCustomMetric(id);
            }
        });

        // Export metrics.
        $('#export-metrics').on('click', function() {
            exportMetrics();
        });

        // Import metrics - trigger file input.
        $('#import-metrics-btn').on('click', function() {
            $('#import-metrics-file').click();
        });

        // Import file selected.
        $('#import-metrics-file').on('change', function(e) {
            var file = e.target.files[0];
            if (file) {
                var reader = new FileReader();
                reader.onload = function(e) {
                    importFileContent = e.target.result;
                    $('#import-options').slideDown();
                };
                reader.readAsText(file);
            }
        });

        // Confirm import.
        $('#confirm-import').on('click', function() {
            var mode = $('input[name="import_mode"]:checked').val();
            importMetrics(importFileContent, mode);
        });

        // Cancel import.
        $('#cancel-import').on('click', function() {
            $('#import-options').slideUp();
            $('#import-metrics-file').val('');
            importFileContent = null;
        });
    }

    /**
     * Initialize dashboards tab handlers.
     */
    function initDashboardsHandlers() {
        $(document).on('click', '.download-dashboard', function() {
            var slug = $(this).data('slug');
            downloadDashboard(slug);
        });
    }

    /**
     * Initialize reset runtime metrics handler.
     */
    function initResetRuntimeHandler() {
        $('#wp-prometheus-reset-runtime').on('click', function() {
            if (confirm(wpPrometheus.confirmReset)) {
                resetRuntimeMetrics();
            }
        });
    }

    /**
     * Perform a license action via AJAX.
     *
     * @param {string} action AJAX action name.
     * @param {string} message Loading message.
     */
    function performLicenseAction(action, message) {
        var $spinner = $('#wp-prometheus-license-spinner');
        var $message = $('#wp-prometheus-license-message');

        $spinner.addClass('is-active');
        $message.hide();

        $.ajax({
            url: wpPrometheus.ajaxUrl,
            type: 'POST',
            data: {
                action: action,
                nonce: wpPrometheus.nonce
            },
            success: function(response) {
                $spinner.removeClass('is-active');

                if (response.success) {
                    $message
                        .removeClass('notice-error')
                        .addClass('notice notice-success')
                        .html('<p>' + response.data.message + '</p>')
                        .show();

                    // Reload page after successful validation/activation.
                    setTimeout(function() {
                        location.reload();
                    }, 1500);
                } else {
                    $message
                        .removeClass('notice-success')
                        .addClass('notice notice-error')
                        .html('<p>' + (response.data.message || 'An error occurred.') + '</p>')
                        .show();
                }
            },
            error: function() {
                $spinner.removeClass('is-active');
                $message
                    .removeClass('notice-success')
                    .addClass('notice notice-error')
                    .html('<p>Connection error. Please try again.</p>')
                    .show();
            }
        });
    }

    /**
     * Save custom metric via AJAX.
     */
    function saveCustomMetric() {
        var $spinner = $('#wp-prometheus-metric-spinner');
        var $message = $('#wp-prometheus-metric-message');
        var $form = $('#wp-prometheus-metric-form');

        $spinner.addClass('is-active');
        $message.hide();

        var formData = $form.serialize();
        formData += '&action=wp_prometheus_save_custom_metric';
        formData += '&nonce=' + wpPrometheus.customMetricNonce;

        $.ajax({
            url: wpPrometheus.ajaxUrl,
            type: 'POST',
            data: formData,
            success: function(response) {
                $spinner.removeClass('is-active');

                if (response.success) {
                    $message
                        .removeClass('notice-error')
                        .addClass('notice notice-success')
                        .html('<p>' + response.data.message + '</p>')
                        .show();

                    setTimeout(function() {
                        window.location.href = window.location.pathname + '?page=wp-prometheus&tab=custom';
                    }, 1000);
                } else {
                    $message
                        .removeClass('notice-success')
                        .addClass('notice notice-error')
                        .html('<p>' + (response.data.message || 'An error occurred.') + '</p>')
                        .show();
                }
            },
            error: function() {
                $spinner.removeClass('is-active');
                $message
                    .removeClass('notice-success')
                    .addClass('notice notice-error')
                    .html('<p>Connection error. Please try again.</p>')
                    .show();
            }
        });
    }

    /**
     * Delete custom metric via AJAX.
     *
     * @param {string} id Metric ID.
     */
    function deleteCustomMetric(id) {
        $.ajax({
            url: wpPrometheus.ajaxUrl,
            type: 'POST',
            data: {
                action: 'wp_prometheus_delete_custom_metric',
                nonce: wpPrometheus.customMetricNonce,
                id: id
            },
            success: function(response) {
                if (response.success) {
                    $('tr[data-metric-id="' + id + '"]').fadeOut(function() {
                        $(this).remove();
                        // Check if table is empty.
                        if ($('.wp-prometheus-custom-metrics tbody tr').length === 0) {
                            location.reload();
                        }
                    });
                } else {
                    alert(response.data.message || 'An error occurred.');
                }
            },
            error: function() {
                alert('Connection error. Please try again.');
            }
        });
    }

    /**
     * Export metrics via AJAX.
     */
    function exportMetrics() {
        $.ajax({
            url: wpPrometheus.ajaxUrl,
            type: 'POST',
            data: {
                action: 'wp_prometheus_export_metrics',
                nonce: wpPrometheus.exportNonce
            },
            success: function(response) {
                if (response.success) {
                    downloadFile(response.data.json, response.data.filename, 'application/json');
                } else {
                    alert(response.data.message || 'An error occurred.');
                }
            },
            error: function() {
                alert('Connection error. Please try again.');
            }
        });
    }

    /**
     * Import metrics via AJAX.
     *
     * @param {string} json JSON content.
     * @param {string} mode Import mode.
     */
    function importMetrics(json, mode) {
        var $spinner = $('#wp-prometheus-import-spinner');
        var $message = $('#wp-prometheus-import-message');

        $spinner.addClass('is-active');
        $message.hide();

        $.ajax({
            url: wpPrometheus.ajaxUrl,
            type: 'POST',
            data: {
                action: 'wp_prometheus_import_metrics',
                nonce: wpPrometheus.importNonce,
                json: json,
                mode: mode
            },
            success: function(response) {
                $spinner.removeClass('is-active');

                if (response.success) {
                    $message
                        .removeClass('notice-error')
                        .addClass('notice notice-success')
                        .html('<p>' + response.data.message + '</p>')
                        .show();

                    $('#import-options').slideUp();
                    $('#import-metrics-file').val('');
                    importFileContent = null;

                    setTimeout(function() {
                        location.reload();
                    }, 1500);
                } else {
                    $message
                        .removeClass('notice-success')
                        .addClass('notice notice-error')
                        .html('<p>' + (response.data.message || 'An error occurred.') + '</p>')
                        .show();
                }
            },
            error: function() {
                $spinner.removeClass('is-active');
                $message
                    .removeClass('notice-success')
                    .addClass('notice notice-error')
                    .html('<p>Connection error. Please try again.</p>')
                    .show();
            }
        });
    }

    /**
     * Download dashboard via AJAX.
     *
     * @param {string} slug Dashboard slug.
     */
    function downloadDashboard(slug) {
        $.ajax({
            url: wpPrometheus.ajaxUrl,
            type: 'POST',
            data: {
                action: 'wp_prometheus_download_dashboard',
                nonce: wpPrometheus.dashboardNonce,
                slug: slug
            },
            success: function(response) {
                if (response.success) {
                    downloadFile(response.data.json, response.data.filename, 'application/json');
                } else {
                    alert(response.data.message || 'An error occurred.');
                }
            },
            error: function() {
                alert('Connection error. Please try again.');
            }
        });
    }

    /**
     * Reset runtime metrics via AJAX.
     */
    function resetRuntimeMetrics() {
        var $spinner = $('#wp-prometheus-reset-spinner');
        var $message = $('#wp-prometheus-reset-message');

        $spinner.addClass('is-active');
        $message.hide();

        $.ajax({
            url: wpPrometheus.ajaxUrl,
            type: 'POST',
            data: {
                action: 'wp_prometheus_reset_runtime_metrics',
                nonce: wpPrometheus.resetRuntimeNonce
            },
            success: function(response) {
                $spinner.removeClass('is-active');

                if (response.success) {
                    $message
                        .removeClass('notice-error')
                        .addClass('notice notice-success')
                        .html('<p>' + response.data.message + '</p>')
                        .show();
                } else {
                    $message
                        .removeClass('notice-success')
                        .addClass('notice notice-error')
                        .html('<p>' + (response.data.message || 'An error occurred.') + '</p>')
                        .show();
                }
            },
            error: function() {
                $spinner.removeClass('is-active');
                $message
                    .removeClass('notice-success')
                    .addClass('notice notice-error')
                    .html('<p>Connection error. Please try again.</p>')
                    .show();
            }
        });
    }

    /**
     * Reset the metric form to default state.
     */
    function resetMetricForm() {
        var $form = $('#wp-prometheus-metric-form');
        $form[0].reset();
        $('#metric-id').val('');
        $('#wp-prometheus-form-title').text('Add New Metric');
        $('#option-config-row').hide();
        $('#static-values-row').show();
        $('#wp-prometheus-metric-message').hide();

        // Reset labels to single empty row.
        $('#metric-labels-container').html(
            '<div class="metric-label-row">' +
            '<input type="text" name="labels[]" class="regular-text" placeholder="label_name" pattern="[a-zA-Z_][a-zA-Z0-9_]*">' +
            '<button type="button" class="button remove-label">&times;</button>' +
            '</div>'
        );

        // Reset values to single empty row.
        $('#metric-values-container').html(
            '<div class="metric-value-row">' +
            '<input type="number" name="label_values[0][]" class="small-text" step="any" placeholder="Value">' +
            '<button type="button" class="button remove-value-row">&times;</button>' +
            '</div>'
        );
    }

    /**
     * Update value rows when labels change.
     */
    function updateValueRows() {
        var labels = getLabels();
        var labelCount = labels.length;

        $('#metric-values-container .metric-value-row').each(function(rowIndex) {
            var $row = $(this);
            var inputs = $row.find('input').toArray();
            var currentValues = inputs.map(function(input) { return input.value; });

            // Remove all inputs except the value and button.
            $row.find('input').remove();

            // Re-add label inputs.
            for (var i = 0; i < labelCount; i++) {
                var val = currentValues[i] || '';
                $row.prepend('<input type="text" name="label_values[' + rowIndex + '][]" class="small-text" placeholder="' + (labels[i] || 'value') + '" value="' + val + '">');
            }

            // Re-add value input.
            var metricVal = currentValues[currentValues.length - 1] || '';
            $row.find('.remove-value-row').before('<input type="number" name="label_values[' + rowIndex + '][]" class="small-text" step="any" placeholder="Value" value="' + metricVal + '">');
        });
    }

    /**
     * Get current label names.
     *
     * @return {string[]} Array of label names.
     */
    function getLabels() {
        var labels = [];
        $('#metric-labels-container input[name="labels[]"]').each(function() {
            var val = $(this).val().trim();
            if (val) {
                labels.push(val);
            }
        });
        return labels;
    }

    /**
     * Get current label count.
     *
     * @return {number} Number of labels.
     */
    function getLabelCount() {
        return getLabels().length;
    }

    /**
     * Generate a random token.
     *
     * @param {number} length Token length.
     * @return {string} Generated token.
     */
    function generateToken(length) {
        var charset = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        var token = '';
        for (var i = 0; i < length; i++) {
            token += charset.charAt(Math.floor(Math.random() * charset.length));
        }
        return token;
    }

    /**
     * Download a file.
     *
     * @param {string} content File content.
     * @param {string} filename Filename.
     * @param {string} type MIME type.
     */
    function downloadFile(content, filename, type) {
        var blob = new Blob([content], { type: type });
        var url = URL.createObjectURL(blob);
        var a = document.createElement('a');
        a.href = url;
        a.download = filename;
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        URL.revokeObjectURL(url);
    }
})(jQuery);