<?php
namespace JVBase\integrations;

use JVBase\managers\CacheManager;
use WP_Error;
use WP_Post;
use Exception;

if (!defined('ABSPATH')) {
	exit;
}

class Umami extends Integrations
{
	private string $website_id;
	private string $api_url;
	private string $api_token;

	// Tracking configuration
	private array $valid_events = [
		'view_feed',
		'view_taxonomy',
		'view_profile',
		'view_shop',
		'view_content',
		'toggle_favourite',
		'click_profile',
		'click_content',
		'click_taxonomy',
		'click_shop',
		'user_session'
	];

	// Database tables
	private string $events_table;
	private string $metrics_table;

	public function __construct(?int $userID = null)
	{
		$this->service_name = 'umami';
		$this->title = 'Umami.js';
		$this->icon = 'chart-line';
		$this->apiBase = '';  // Set dynamically based on credentials
		$this->apiEndpoints = [
			'api/websites',
			'api/websites/{websiteId}/stats',
			'api/websites/{websiteId}/pageviews',
			'api/websites/{websiteId}/events'
		];

		$this->fields = [
			'website_id' => [
				'label'		=> 'Website ID',
				'type'		=> 'text',
				'placeholder'=> 'Enter Umami Website ID',
				'hint'		=> 'Found in your Umami dashboard under Settings → Websites.',
				'required'	=> true
			],
		];

		$this->advanced = [
			'api_url' => [
				'label'		=> 'API URL',
				'type'		=> 'text',
				'placeholder'=> 'https://analytics.yourdomain.com',
				'hint'		=> 'Your Umami server URL. Leave blank if using umami.is cloud service.'
			],
			'api_token' => [
				'label'		=> 'API Token (Optional)',
				'type'		=> 'text',
				'subtype'	=> 'password',
				'placeholder'=> 'Enter API Token for analytics data',
				'hint'		=> 'Required only if you want to retrieve analytics data for dashboards.'
			]
		];

		$this->instructions = [
			'Login to your <a href="https://cloud.umami.is/settings/websites" target="_blank">umami.is</a> account, select your website, and copy the website ID'
		];

		parent::__construct($userID);

		$this->actions = array_merge(
			$this->actions,
			[
				'refresh_data'	=> 	'handleRefreshData'
			]
		);

		global $wpdb;
		$this->events_table = $wpdb->prefix . BASE . 'umami_events';
		$this->metrics_table = $wpdb->prefix . BASE . 'performance_metrics';
	}

	/**
	 * Initialize service-specific properties
	 */
	protected function initialize(): void
	{
		$this->website_id = $this->credentials['website_id'] ?? '';
		$this->api_url = $this->credentials['api_url'] ?? '';
		$this->api_token = $this->credentials['api_token'] ?? '';
		$this->ttl = intval($this->credentials['cache_duration'] ?? 60) * 60;

		// Set dynamic API base if provided
		if (!empty($this->api_url)) {
			$this->apiBase = rtrim($this->api_url, '/');
		}
	}

	/**
	 * Register additional WordPress hooks
	 */
	protected function registerAdditionalHooks(): void
	{
		// Add tracking script to frontend
		add_action('wp_head', [$this, 'renderTrackingScript'], 5);

		// Add user session tracking
		add_action('wp_footer', [$this, 'trackUserSession'], 100);

		// Schedule data collection if API is configured
		if (!empty($this->api_token)) {
			add_action('jvb_daily_umami_collection', [$this, 'collectDailyData']);

			if (!wp_next_scheduled('jvb_daily_umami_collection')) {
				wp_schedule_event(time(), 'daily', 'jvb_daily_umami_collection');
			}
		}
	}

	/***************************************************************************
	 * TRACKING SCRIPT METHODS
	 ***************************************************************************/

	/**
	 * Render tracking script in head
	 */
	public function renderTrackingScript(): void
	{
		if (!$this->isSetUp() || is_admin()) {
			return;
		}

		// Skip on local environments
		if (strpos(get_home_url(), JVB_LOCAL) !== false) {
			return;
		}

		$script_url = $this->getTrackingScriptUrl();
		$website_id = $this->getWebsiteId();

		if (!$website_id || !$script_url) {
			return;
		}

		// Preconnect for performance
		$domain = parse_url($script_url, PHP_URL_HOST);
		echo '<link rel="preconnect" href="https://' . esc_attr($domain) . '"/>' . "\n";

		// Add tracking script
		$attributes = [
			'defer',
			'src="' . esc_url($script_url) . '"',
			'data-website-id="' . esc_attr($website_id) . '"'
		];

		// Add optional configuration
		if (!empty($this->credentials['respect_dnt']) && $this->credentials['respect_dnt']) {
			$attributes[] = 'data-do-not-track="true"';
		}

		if (!empty($this->credentials['domains'])) {
			$attributes[] = 'data-domains="' . esc_attr($this->credentials['domains']) . '"';
		}

		echo '<script ' . implode(' ', $attributes) . '></script>' . "\n";
	}

	/**
	 * Track user session information
	 */
	public function trackUserSession(): void
	{
		if (!$this->isSetUp() || is_admin()) {
			return;
		}

		$attributes = $this->buildTrackingAttributes('user_session', 'pageview', [
			'logged_in' => is_user_logged_in() ? 'true' : 'false',
			'user_type' => $this->getCurrentUserType()
		]);

		if (empty($attributes)) {
			return;
		}

		echo '<div ' . $this->attributesToString($attributes) . ' style="display:none"></div>' . "\n";

		// Add page-specific tracking
		$this->trackPageView();
	}

	/**
	 * Track specific page views
	 */
	private function trackPageView(): void
	{
		$tracker_args = [];
		$event = '';
		$type = '';

		if (is_singular([BASE . 'artist', BASE . 'partner'])) {
			// Profile view
			global $post;
			$event = 'view_profile';
			$type = get_post_type();
			$tracker_args = [
				'id' => get_the_ID(),
				'from' => $this->getTrafficSource(),
				'owner_id' => $post->post_author
			];

			// Check for specific content in query
			foreach (['tattoo', 'piercing', 'artwork'] as $content_type) {
				if (isset($_GET[$content_type])) {
					$tracker_args['item'] = sanitize_text_field($_GET[$content_type]);
					break;
				}
			}

		} elseif (is_tax(BASE . 'shop')) {
			// Shop view
			$event = 'view_shop';
			$type = BASE . 'shop';
			$tracker_args = [
				'id' => get_queried_object_id(),
				'from' => $this->getTrafficSource()
			];

		} elseif (is_tax()) {
			// Taxonomy view
			$obj = get_queried_object();
			$event = 'view_taxonomy';
			$type = $obj->taxonomy;
			$tracker_args = [
				'id' => $obj->term_id,
				'from' => $this->getTrafficSource()
			];
		}

		if ($event && $type) {
			$attributes = $this->buildTrackingAttributes($event, $type, $tracker_args);
			echo '<div ' . $this->attributesToString($attributes) . ' style="display:none"></div>' . "\n";
		}
	}

	/***************************************************************************
	 * TRACKING ATTRIBUTE BUILDER METHODS
	 ***************************************************************************/

	/**
	 * Build tracking attributes for events
	 */
	public function buildTrackingAttributes(string $event, string $type, array $args = []): array
	{
		if (!in_array($event, $this->valid_events)) {
			return [];
		}

		// Normalize type
		$normalized_type = str_replace(BASE, '', $type);

		// Build base attributes
		$attributes = [
			'data-umami-event' => esc_attr($event),
			'data-umami-event-type' => esc_attr($normalized_type)
		];

		// Add ID if provided
		if (!empty($args['id'])) {
			$attributes['data-umami-event-id'] = esc_attr($args['id']);
		}

		// Add source information
		if (!empty($args['source_id'])) {
			$attributes['data-umami-event-source'] = esc_attr($args['source_id']);
			if (!empty($args['source_type'])) {
				$attributes['data-umami-event-source-type'] = esc_attr(
					str_replace(BASE, '', $args['source_type'])
				);
			}
		}

		// Add owner information
		if (!empty($args['owner_id'])) {
			$attributes['data-umami-event-owner'] = esc_attr($args['owner_id']);
			if (!empty($args['owner_type'])) {
				$attributes['data-umami-event-owner-type'] = esc_attr(
					str_replace(BASE, '', $args['owner_type'])
				);
			}
		}

		// Add traffic source
		if (!empty($args['from'])) {
			$attributes['data-umami-event-from'] = esc_attr($args['from']);
		}

		// Add item reference
		if (!empty($args['item'])) {
			$attributes['data-umami-event-item'] = esc_attr($args['item']);
		}

		// Add metadata
		foreach ($args as $key => $value) {
			if (in_array($key, ['id', 'source_id', 'source_type', 'owner_id', 'owner_type', 'from', 'item'])) {
				continue;
			}
			$clean_key = 'data-umami-event-' . str_replace('_', '-', sanitize_key($key));
			$attributes[$clean_key] = esc_attr($value);
		}

		return $attributes;
	}

	/**
	 * Convert attributes array to HTML string
	 */
	public function attributesToString(array $attributes): string
	{
		$attr_strings = [];
		foreach ($attributes as $key => $value) {
			$attr_strings[] = $key . '="' . $value . '"';
		}
		return implode(' ', $attr_strings);
	}

	/**
	 * Public tracking methods for use in templates
	 */
	public function trackContentClick(int $id, string $type, array $args = []): string
	{
		$args['id'] = $id;

		// Auto-detect owner for content types
		if (empty($args['owner_id']) && in_array($type, [BASE . 'tattoo', BASE . 'artwork', BASE . 'piercing'])) {
			$post = get_post($id);
			if ($post && !empty($post->post_author)) {
				$args['owner_id'] = $post->post_author;
				$args['owner_type'] = 'user';
			}
		}

		return $this->attributesToString(
			$this->buildTrackingAttributes('click_content', $type, $args)
		);
	}

	public function trackProfileClick(int $id, string $type, array $args = []): string
	{
		$args['id'] = $id;
		return $this->attributesToString(
			$this->buildTrackingAttributes('click_profile', $type, $args)
		);
	}

	public function trackTaxonomyClick(int $id, string $taxonomy, array $args = []): string
	{
		$args['id'] = $id;
		return $this->attributesToString(
			$this->buildTrackingAttributes('click_taxonomy', $taxonomy, $args)
		);
	}

	public function trackContentTaxonomyClick(int $id, string $taxonomy, array $args = []): string
	{
		$args['id'] = $id;
		return $this->attributesToString(
			$this->buildTrackingAttributes('click_' . $taxonomy, $taxonomy, $args)
		);
	}

	public function trackFavouriteToggle(int $id, string $type, bool $is_favourite, array $args = []): string
	{
		$args['id'] = $id;
		$args['action'] = $is_favourite ? 'add' : 'remove';
		return $this->attributesToString(
			$this->buildTrackingAttributes('toggle_favourite', $type, $args)
		);
	}

	public function trackFeedView(int $id, string $type, array $args = []): array
	{
		$args['id'] = $id;
		return $this->buildTrackingAttributes('view_feed', $type, $args);
	}

	/***************************************************************************
	 * API DATA COLLECTION METHODS
	 ***************************************************************************/

	/**
	 * Get analytics data from Umami API
	 */
	public function getAnalytics(string $start_date, string $end_date, bool $use_cache = true): ?array
	{
		if (empty($this->api_url) || empty($this->api_token)) {
			return null;
		}

		// Check cache first
		if ($use_cache && $this->cache) {
			$cache_key = md5("analytics_{$start_date}_{$end_date}");
			$cached = $this->cache->get($cache_key);
			if ($cached !== false) {
				return $cached;
			}
		}

		try {
			$url = rtrim($this->api_url, '/') . "/api/websites/{$this->website_id}/stats";
			$params = [
				'startAt' => strtotime($start_date) * 1000,
				'endAt' => strtotime($end_date) * 1000
			];

			$response = wp_remote_get($url . '?' . http_build_query($params), [
				'headers' => [
					'Authorization' => 'Bearer ' . $this->api_token,
					'Accept' => 'application/json'
				],
				'timeout' => 30
			]);

			if (is_wp_error($response)) {
				$this->logError('API request failed', ['error' => $response->get_error_message()]);
				return null;
			}

			$body = wp_remote_retrieve_body($response);
			$data = json_decode($body, true);

			if (json_last_error() !== JSON_ERROR_NONE) {
				$this->logError('Invalid JSON response from API');
				return null;
			}

			// Cache the result
			if ($use_cache && $this->cache) {
				$this->cache->set($cache_key, $data, $this->ttl);
			}

			return $data;

		} catch (Exception $e) {
			$this->logError('Exception during API call', ['error' => $e->getMessage()]);
			return null;
		}
	}

	/**
	 * Get page views for a specific URL
	 */
	public function getPageViews(string $url, string $start_date, string $end_date): ?array
	{
		if (empty($this->api_url) || empty($this->api_token)) {
			return null;
		}

		$api_endpoint = rtrim($this->api_url, '/') . "/api/websites/{$this->website_id}/pageviews";
		$params = [
			'startAt' => strtotime($start_date) * 1000,
			'endAt' => strtotime($end_date) * 1000,
			'url' => $url,
			'unit' => 'day'
		];

		$response = wp_remote_get($api_endpoint . '?' . http_build_query($params), [
			'headers' => [
				'Authorization' => 'Bearer ' . $this->api_token,
				'Accept' => 'application/json'
			],
			'timeout' => 30
		]);

		if (is_wp_error($response)) {
			return null;
		}

		return json_decode(wp_remote_retrieve_body($response), true);
	}

	/**
	 * Get custom events data
	 */
	public function getEvents(string $event_name = '', string $start_date = '', string $end_date = ''): ?array
	{
		if (empty($this->api_url) || empty($this->api_token)) {
			return null;
		}

		$api_endpoint = rtrim($this->api_url, '/') . "/api/websites/{$this->website_id}/events";

		$params = [];
		if ($start_date && $end_date) {
			$params['startAt'] = strtotime($start_date) * 1000;
			$params['endAt'] = strtotime($end_date) * 1000;
		}
		if ($event_name) {
			$params['event'] = $event_name;
		}

		$url = $api_endpoint;
		if (!empty($params)) {
			$url .= '?' . http_build_query($params);
		}

		$response = wp_remote_get($url, [
			'headers' => [
				'Authorization' => 'Bearer ' . $this->api_token,
				'Accept' => 'application/json'
			],
			'timeout' => 30
		]);

		if (is_wp_error($response)) {
			return null;
		}

		return json_decode(wp_remote_retrieve_body($response), true);
	}

	/**
	 * Collect daily analytics data and store in database
	 */
	public function collectDailyData(): void
	{
		if (!$this->isSetUp() || empty($this->api_token)) {
			return;
		}

		$yesterday = date('Y-m-d', strtotime('-1 day'));
		$data = $this->getAnalytics($yesterday, $yesterday, false);

		if (!$data) {
			$this->logError('Failed to collect daily data', ['date' => $yesterday]);
			return;
		}

		global $wpdb;

		// Store basic metrics
		$wpdb->insert($this->metrics_table, [
			'date' => $yesterday,
			'pageviews' => $data['pageviews']['value'] ?? 0,
			'visitors' => $data['visitors']['value'] ?? 0,
			'visits' => $data['visits']['value'] ?? 0,
			'bounces' => $data['bounces']['value'] ?? 0,
			'total_time' => $data['totaltime']['value'] ?? 0,
			'created_at' => current_time('mysql')
		]);

		// Collect and store events
		$events = $this->getEvents('', $yesterday, $yesterday);
		if ($events) {
			foreach ($events as $event) {
				$wpdb->insert($this->events_table, [
					'date' => $yesterday,
					'event_name' => $event['x'] ?? '',
					'event_count' => $event['y'] ?? 0,
					'created_at' => current_time('mysql')
				]);
			}
		}

		$this->logDebug('Successfully collected daily data', ['date' => $yesterday]);
	}

	/***************************************************************************
	 * HELPER METHODS
	 ***************************************************************************/

	/**
	 * Get current user type for tracking
	 */
	private function getCurrentUserType(): string
	{
		if (!is_user_logged_in()) {
			return 'guest';
		}

		$user = wp_get_current_user();
		$roles = $user->roles;

		if (empty($roles)) {
			return 'user';
		}

		$role = array_values($roles)[0];
		return str_replace(BASE, '', $role);
	}

	/**
	 * Determine traffic source
	 */
	private function getTrafficSource(): string
	{
		if (isset($_GET['utm_source'])) {
			return sanitize_text_field($_GET['utm_source']);
		}

		if (isset($_SERVER['HTTP_REFERER'])) {
			$referer = $_SERVER['HTTP_REFERER'];
			$site_url = get_site_url();

			if (strpos($referer, $site_url) === false) {
				$domain = parse_url($referer, PHP_URL_HOST);
				return $domain ?: 'external';
			}

			return 'internal';
		}

		return 'direct';
	}

	/**
	 * Get website ID
	 */
	public function getWebsiteId(): string
	{
		$this->ensureInitialized();
		return $this->website_id;
	}

	/**
	 * Get tracking script URL
	 */
	public function getTrackingScriptUrl(): string
	{
		if (!empty($this->api_url)) {
			return rtrim($this->api_url, '/') . '/script.js';
		}

		// Default to Umami cloud
		return 'https://cloud.umami.is/script.js';
	}

	/***************************************************************************
	 * REQUIRED ABSTRACT METHOD IMPLEMENTATIONS
	 ***************************************************************************/

	/**
	 * Get request headers for API calls
	 */
	protected function getRequestHeaders(): array
	{
		$headers = [
			'Accept' => 'application/json',
			'Content-Type' => 'application/json'
		];

		if (!empty($this->api_token)) {
			$headers['Authorization'] = 'Bearer ' . $this->api_token;
		}

		return $headers;
	}

	protected function handleRefreshData():array
	{
		// Collect today's data
		$today = date('Y-m-d');
		$data = $this->getAnalytics($today, $today, false);

		if ($data) {
			// Clear cache for today
			$cache_key = md5("analytics_{$today}_{$today}");
			$this->cache->delete($cache_key);

			return [
				'success' => true,
				'message' => 'Data refreshed successfully',
				'data' => $data
			];
		}

		return [
			'success'	=> false,
			'message'	=> 'Something went wrong...'
		];
	}

	/**
	 * Process queued operations
	 */
	public function processOperation(WP_Error|array $result, object $operation, array $data): WP_Error|array
	{
		$prefix = strtolower($this->service_name) . '_';

		switch ($operation->type) {
			case $prefix . 'collect_analytics':
				$this->collectDailyData();
				return ['success' => true, 'message' => 'Analytics collected'];

			default:
				return $result;
		}
	}

	/**
	 * Test API connection
	 */
	protected function performConnectionTest(): bool
	{
		// Basic tracking only needs website ID
		if (empty($this->website_id)) {
			return false;
		}

		// If API credentials provided, test them
		if (!empty($this->api_url) && !empty($this->api_token)) {
			try {
				$response = wp_remote_get(rtrim($this->api_url, '/') . '/api/websites', [
					'headers' => [
						'Authorization' => 'Bearer ' . $this->api_token,
						'Accept' => 'application/json'
					],
					'timeout' => 10
				]);

				if (is_wp_error($response)) {
					return false;
				}

				return wp_remote_retrieve_response_code($response) === 200;

			} catch (Exception $e) {
				$this->logError('Connection test failed', ['error' => $e->getMessage()]);
				return false;
			}
		}

		// Website ID exists, basic tracking will work
		return true;
	}

	/**
	 * Get service description
	 */
	public function getServiceDescription(): string
	{
		return "Privacy-focused analytics to understand your website traffic.";
	}

	/**
	 * Create database tables for metrics storage
	 */
	public static function createTables(): void
	{
		global $wpdb;
		$charset_collate = $wpdb->get_charset_collate();

		// Events table
		$events_table = $wpdb->prefix . BASE . 'umami_events';
		$events_sql = "CREATE TABLE IF NOT EXISTS $events_table (
            id bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT,
            date date NOT NULL,
            event_name varchar(255) NOT NULL,
            event_count int(11) NOT NULL DEFAULT 0,
            event_data longtext,
            created_at datetime NOT NULL,
            PRIMARY KEY (id),
            KEY date_event (date, event_name)
        ) $charset_collate;";

		// Metrics table
		$metrics_table = $wpdb->prefix . BASE . 'performance_metrics';
		$metrics_sql = "CREATE TABLE IF NOT EXISTS $metrics_table (
            id bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT,
            date date NOT NULL,
            pageviews int(11) NOT NULL DEFAULT 0,
            visitors int(11) NOT NULL DEFAULT 0,
            visits int(11) NOT NULL DEFAULT 0,
            bounces int(11) NOT NULL DEFAULT 0,
            total_time int(11) NOT NULL DEFAULT 0,
            created_at datetime NOT NULL,
            PRIMARY KEY (id),
            UNIQUE KEY date_unique (date)
        ) $charset_collate;";

		require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
		dbDelta($events_sql);
		dbDelta($metrics_sql);
	}
}