<?php

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

class Argus_DB {

	const SCHEMA_VERSION = '8';
	const SCHEMA_OPTION  = 'argus_wpd_schema_version';

	protected static function drop_index_if_exists( $table, $index ) {
		global $wpdb;
		$exists = $wpdb->get_var(
			$wpdb->prepare( 'SHOW INDEX FROM ' . $table . ' WHERE Key_name = %s', $index ) // phpcs:ignore
		);
		if ( $exists ) {
			$wpdb->query( 'ALTER TABLE ' . $table . ' DROP INDEX ' . $index ); // phpcs:ignore
		}
	}

	public static function table( $name ) {
		global $wpdb;
		return $wpdb->prefix . 'argus_' . $name;
	}

	public static function install() {
		global $wpdb;

		require_once ABSPATH . 'wp-admin/includes/upgrade.php';

		$charset_collate = $wpdb->get_charset_collate();

		$events = self::table( 'events' );
		$findings = self::table( 'findings' );
		$bans = self::table( 'bans' );
		$policy_decisions = self::table( 'policy_decisions' );
		$integrity_baseline = self::table( 'integrity_baseline' );
		$login_attempts = self::table( 'login_attempts' );
		$vuln_cache = self::table( 'vuln_cache' );
		$quarantine = self::table( 'quarantine' );
		$cache_stats_daily = self::table( 'cache_stats_daily' );
		$cache_discovered_urls = self::table( 'cache_discovered_urls' );
		$cache_warm_queue = self::table( 'cache_warm_queue' );
		$anis_reputation = self::table( 'anis_reputation' );
		$vuln_status = self::table( 'vuln_status' );
		$scan_history = self::table( 'scan_history' );
		$backups = self::table( 'backups' );

		$sql = "CREATE TABLE {$events} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			event_type VARCHAR(40) NOT NULL,
			severity VARCHAR(20) NOT NULL DEFAULT 'info',
			ip VARCHAR(45) NULL,
			summary VARCHAR(255) NOT NULL,
			payload LONGTEXT NULL,
			created_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			KEY event_type (event_type),
			KEY created_at (created_at),
			KEY ip (ip)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$findings} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			category VARCHAR(40) NOT NULL,
			severity VARCHAR(20) NOT NULL,
			title VARCHAR(255) NOT NULL,
			detail LONGTEXT NULL,
			remediation_hint LONGTEXT NULL,
			evidence LONGTEXT NULL,
			status VARCHAR(20) NOT NULL DEFAULT 'open',
			first_seen_at DATETIME NOT NULL,
			last_seen_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			KEY category (category),
			KEY status (status),
			KEY severity (severity)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$bans} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			ip VARCHAR(45) NOT NULL,
			source VARCHAR(40) NOT NULL,
			reason VARCHAR(255) NOT NULL,
			evidence LONGTEXT NULL,
			ban_level VARCHAR(20) NOT NULL DEFAULT 'temporary',
			created_at DATETIME NOT NULL,
			expires_at DATETIME NULL,
			recovery_eligible_at DATETIME NULL,
			lifted_at DATETIME NULL,
			PRIMARY KEY  (id),
			KEY ip (ip),
			KEY expires_at (expires_at)
		) {$charset_collate};";
		dbDelta( $sql );
		self::drop_index_if_exists( $bans, 'ip_active' );

		$sql = "CREATE TABLE {$policy_decisions} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			ip VARCHAR(45) NOT NULL,
			trigger_type VARCHAR(40) NOT NULL,
			action VARCHAR(20) NOT NULL,
			rule_name VARCHAR(100) NULL,
			reason VARCHAR(255) NOT NULL,
			observation_only TINYINT(1) NOT NULL DEFAULT 0,
			mode VARCHAR(20) NOT NULL,
			created_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			KEY ip (ip),
			KEY created_at (created_at)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$integrity_baseline} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			file_path VARCHAR(500) NOT NULL,
			file_hash CHAR(64) NOT NULL,
			file_size BIGINT UNSIGNED NOT NULL,
			file_mtime DATETIME NOT NULL,
			category VARCHAR(20) NOT NULL,
			first_seen_at DATETIME NOT NULL,
			last_checked_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			UNIQUE KEY file_path (file_path(191)),
			KEY category (category)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$login_attempts} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			ip VARCHAR(45) NOT NULL,
			username VARCHAR(60) NOT NULL,
			success TINYINT(1) NOT NULL DEFAULT 0,
			created_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			KEY ip_created (ip, created_at),
			KEY username_created (username, created_at)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$vuln_cache} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			component_type VARCHAR(20) NOT NULL,
			slug VARCHAR(191) NOT NULL,
			vulnerable_below VARCHAR(40) NULL,
			fixed_in VARCHAR(40) NULL,
			severity VARCHAR(20) NOT NULL,
			cve VARCHAR(20) NULL,
			description LONGTEXT NULL,
			updated_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			KEY component_slug (component_type, slug(120))
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$quarantine} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			original_path VARCHAR(500) NOT NULL,
			quarantine_filename VARCHAR(60) NOT NULL,
			original_filename VARCHAR(255) NOT NULL,
			file_size BIGINT UNSIGNED NOT NULL,
			file_hash CHAR(64) NOT NULL,
			original_mtime DATETIME NULL,
			original_perms VARCHAR(4) NULL,
			detection_engine VARCHAR(60) NOT NULL,
			detection_rule VARCHAR(100) NULL,
			detection_type VARCHAR(20) NOT NULL,
			severity VARCHAR(20) NOT NULL,
			confidence_score INT NULL,
			matched_rules LONGTEXT NULL,
			status VARCHAR(20) NOT NULL DEFAULT 'quarantined',
			finding_id BIGINT UNSIGNED NULL,
			quarantined_at DATETIME NOT NULL,
			analysed_at DATETIME NULL,
			resolved_at DATETIME NULL,
			restore_attempts INT NOT NULL DEFAULT 0,
			PRIMARY KEY  (id),
			UNIQUE KEY quarantine_filename (quarantine_filename),
			KEY status (status),
			KEY finding_id (finding_id)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$cache_stats_daily} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			stat_date DATE NOT NULL,
			status VARCHAR(20) NOT NULL,
			request_count BIGINT UNSIGNED NOT NULL DEFAULT 0,
			total_response_time_ms BIGINT UNSIGNED NOT NULL DEFAULT 0,
			total_bytes BIGINT UNSIGNED NOT NULL DEFAULT 0,
			PRIMARY KEY  (id),
			UNIQUE KEY date_status (stat_date, status)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$cache_discovered_urls} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			url VARCHAR(500) NOT NULL,
			source VARCHAR(40) NOT NULL,
			eligibility VARCHAR(20) NOT NULL DEFAULT 'needs_review',
			eligibility_reason VARCHAR(255) NULL,
			priority_hint DECIMAL(3,2) NULL,
			lastmod DATETIME NULL,
			last_checked_at DATETIME NULL,
			last_warmed_at DATETIME NULL,
			discovered_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			UNIQUE KEY url (url(191)),
			KEY eligibility (eligibility)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$cache_warm_queue} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			url VARCHAR(500) NOT NULL,
			priority INT NOT NULL DEFAULT 100,
			status VARCHAR(20) NOT NULL DEFAULT 'queued',
			attempts INT NOT NULL DEFAULT 0,
			last_attempt_at DATETIME NULL,
			last_result VARCHAR(255) NULL,
			queued_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			KEY status_priority (status, priority),
			KEY url (url(191))
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$anis_reputation} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			ip VARCHAR(45) NOT NULL,
			action VARCHAR(20) NOT NULL,
			confidence INT NOT NULL DEFAULT 0,
			reports INT NOT NULL DEFAULT 0,
			source VARCHAR(60) NULL,
			reason VARCHAR(255) NULL,
			decided_at DATETIME NULL,
			expires_at DATETIME NULL,
			cached_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			UNIQUE KEY ip (ip),
			KEY action (action)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$vuln_status} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			component_type VARCHAR(20) NOT NULL,
			slug VARCHAR(191) NOT NULL,
			name VARCHAR(255) NOT NULL,
			installed_version VARCHAR(40) NULL,
			checked_version VARCHAR(40) NULL,
			status VARCHAR(20) NOT NULL DEFAULT 'pending',
			severity VARCHAR(20) NULL,
			cve VARCHAR(20) NULL,
			fixed_in VARCHAR(40) NULL,
			description LONGTEXT NULL,
			last_checked_at DATETIME NULL,
			updated_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			UNIQUE KEY component (component_type, slug),
			KEY status (status)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$scan_history} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			scan_type VARCHAR(30) NOT NULL,
			started_at DATETIME NOT NULL,
			finished_at DATETIME NOT NULL,
			files_scanned INT UNSIGNED NOT NULL DEFAULT 0,
			findings_count INT UNSIGNED NOT NULL DEFAULT 0,
			result VARCHAR(20) NOT NULL,
			PRIMARY KEY  (id),
			KEY started_at (started_at)
		) {$charset_collate};";
		dbDelta( $sql );

		$sql = "CREATE TABLE {$backups} (
			id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
			filename VARCHAR(191) NOT NULL,
			type VARCHAR(20) NOT NULL,
			size_bytes BIGINT UNSIGNED NOT NULL DEFAULT 0,
			status VARCHAR(20) NOT NULL DEFAULT 'complete',
			error_message TEXT NULL,
			created_at DATETIME NOT NULL,
			PRIMARY KEY  (id),
			UNIQUE KEY filename (filename),
			KEY created_at (created_at)
		) {$charset_collate};";
		dbDelta( $sql );

		update_option( self::SCHEMA_OPTION, self::SCHEMA_VERSION, false );
	}

	public static function maybe_upgrade() {
		if ( get_option( self::SCHEMA_OPTION ) !== self::SCHEMA_VERSION ) {
			self::install();
		}
	}

	public static function uninstall() {
		global $wpdb;
		foreach ( array( 'events', 'findings', 'bans', 'policy_decisions', 'integrity_baseline', 'login_attempts', 'vuln_cache', 'quarantine', 'cache_stats_daily', 'cache_discovered_urls', 'cache_warm_queue', 'anis_reputation', 'vuln_status', 'scan_history', 'backups' ) as $t ) {
			$wpdb->query( 'DROP TABLE IF EXISTS ' . self::table( $t ) ); // phpcs:ignore
		}
		delete_option( self::SCHEMA_OPTION );
	}
}