<?php

namespace Simple_History\Dropins;

use Simple_History\Helpers;

/**
 * Dropin Name: Debug
 * Dropin Description: Add some extra info to each logged context when SIMPLE_HISTORY_LOG_DEBUG is set and true, or when Detective mode is enabled.
 */
class Detective_Mode_Dropin extends Dropin {
	/** @inheritdoc */
	public function loaded() {
		$this->register_settings();

		add_action( 'simple_history/settings_page/general_section_output', [ $this, 'on_general_section_output' ] );

		// Bail if no debug mode is active.
		if ( ! Helpers::log_debug_is_enabled() && ! Helpers::detective_mode_is_enabled() ) {
			return;
		}

		add_action( 'simple_history/log_argument/context', array( $this, 'append_debug_info_to_context' ), 10, 4 );
	}

	/**
	 * Register settings.
	 */
	public function register_settings() {
		$settings_general_option_group = $this->simple_history::SETTINGS_GENERAL_OPTION_GROUP;

		// Checkbox for debug setting that logs extra much info.
		register_setting(
			$settings_general_option_group,
			'simple_history_detective_mode_enabled',
			[
				'sanitize_callback' => [ Helpers::class, 'sanitize_checkbox_input' ],
			]
		);
	}

	/**
	 * Add settings field.
	 *
	 * Function fired from action `simple_history/settings_page/general_section_output`.
	 */
	public function on_general_section_output() {
		$settings_section_general_id = $this->simple_history::SETTINGS_SECTION_GENERAL_ID;
		$settings_menu_slug          = $this->simple_history::SETTINGS_MENU_SLUG;

		add_settings_field(
			'simple_history_debug',
			Helpers::get_settings_field_title_output( __( 'Detective mode', 'simple-history' ), 'mystery' ),
			[ $this, 'settings_field_detective_mode' ],
			$settings_menu_slug,
			$settings_section_general_id
		);
	}

	/**
	 * Settings field output.
	 */
	public function settings_field_detective_mode() {
		$detective_mode_enabled = Helpers::detective_mode_is_enabled();

		?>
		<label>
			<input <?php checked( $detective_mode_enabled ); ?> type="checkbox" value="1" name="simple_history_detective_mode_enabled" />
			<?php esc_html_e( 'Enable detective mode', 'simple-history' ); ?>
		</label>
		
		<p class="description">
			<?php
			echo wp_kses(
				__( 'When enabled, Detective Mode captures in-depth data for each event, including the current <code>$_GET</code>, <code>$_POST</code> values, the current filter name, and much more.', 'simple-history' ),
				[
					'code' => [],
				]
			);
			?>
		</p>

		<p class="description">
			<?php esc_html_e( 'While particularly useful for developers and administrators seeking to understand complex interactions or resolve issues, please note that enabling this feature may increase the volume of logged data.', 'simple-history' ); ?>
		</p>

		<p class="description">
			<?php esc_html_e( 'Heads up: Since request data is captured, sensitive information like API keys or tokens could end up in the log. Common password fields are automatically masked, but we recommend keeping Detective Mode enabled only while actively troubleshooting.', 'simple-history' ); ?>
		</p>

		<p class="description">
			<a href="<?php echo esc_url( Helpers::get_tracking_url( 'https://simple-history.com/support/detective-mode/', 'docs_detective_help' ) ); ?>" target="_blank" class="sh-ExternalLink">
			<?php esc_html_e( 'Read more about detective mode', 'simple-history' ); ?>
			</a>
		</p>
		<?php
	}

	/**
	 * Modify the context to add debug information.
	 *
	 * @param array                                 $context Context array.
	 * @param string                                $level Log level.
	 * @param string                                $message Log message.
	 * @param \Simple_History\Loggers\Simple_Logger $logger Logger instance.
	 */
	public function append_debug_info_to_context( $context, $level, $message, $logger ) {
		global $wp_current_filter;

		$context_key_prefix  = 'detective_mode_';
		$detective_mode_data = [];

		// Keys from $_SERVER to add to context.
		$arr_server_keys_to_add = [
			'HTTP_HOST',
			'REQUEST_URI',
			'REQUEST_METHOD',
			'CONTENT_TYPE',
			'SCRIPT_FILENAME',
			'SCRIPT_NAME',
			'PHP_SELF',
			'HTTP_ORIGIN',
			'CONTENT_TYPE',
			'HTTP_USER_AGENT',
			'REMOTE_ADDR',
			'REQUEST_TIME',
		];

		foreach ( $arr_server_keys_to_add as $key ) {
			if ( ! isset( $_SERVER[ $key ] ) ) {
				continue;
			}

			// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			$detective_mode_data[ 'server_' . strtolower( $key ) ] = wp_unslash( $_SERVER[ $key ] );
		}

		// Copy of posted data, because we may remove sensitive data.
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$get_data = $_GET;

		// phpcs:ignore WordPress.Security.NonceVerification.Missing
		$post_data = $_POST;

		$get_data  = $this->mask_sensitive_data( $get_data );
		$post_data = $this->mask_sensitive_data( $post_data );

		$detective_mode_data += [
			'get'             => $get_data,
			'post'            => $post_data,
			'files'           => $_FILES, // phpcs:ignore WordPress.Security.NonceVerification.Missing
			'current_filter'  => implode( ', ', $wp_current_filter ?? [] ),
			// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_wp_debug_backtrace_summary -- This is a function that is used for debugging.
			'debug_backtrace' => wp_debug_backtrace_summary( null, 0, true ),
			'is_admin'        => is_admin(),
			'doing_ajax'      => wp_doing_ajax(),
			'doing_cron'      => wp_doing_cron(),
			'wp_cli'          => defined( 'WP_CLI' ) && WP_CLI,
			'is_multisite'    => is_multisite(),
			'php_sapi_name'   => php_sapi_name(),
		];

		// Command line arguments. Used by for example WP-CLI.
		if ( isset( $GLOBALS['argv'] ) ) {
			$detective_mode_data['command_line_arguments'] = implode( ' ', $GLOBALS['argv'] );
		}

		// Add all detective mode data to context, with a prefix.
		foreach ( $detective_mode_data as $key => $value ) {
			$context[ $context_key_prefix . $key ] = $value;
		}

		return $context;
	}

	/**
	 * Remove sensitive data from post data, like passwords.
	 *
	 * @param array $data Data to remove sensitive data from, probably GET or POST data.
	 * @return array Data with sensitive data removed.
	 */
	protected function mask_sensitive_data( $data ) {
		// Mask fields that begin with these strings.
		// So for example:
		// - "pass" will mask "password" and "password_2".
		// - "confirm_pass" will mask "confirm_password" but also "confirm_password_2".
		$fields_to_mask = [
			'pwd',
			'pass',
			'confirm_pass',
			'new_application_pass',
			'user_pwd',
			'user_password',
			'user_pass',
		];

		foreach ( $fields_to_mask as $field ) {
			$data = $this->mask_field_that_begin_with( $data, $field );
		}

		return $data;
	}

	/**
	 * Mask fields that begin with a certain string.
	 *
	 * @param array  $data Data to mask, probably GET or POST data.
	 * @param string $field_name_to_mask String to mask. Lowercase.
	 * @return array Data with sensitive data masked.
	 */
	protected function mask_field_that_begin_with( $data, $field_name_to_mask ) {
		foreach ( $data as $key => $value ) {
			$data_key_lowercase = strtolower( $key );
			if ( ! str_starts_with( $data_key_lowercase, $field_name_to_mask ) ) {
				continue;
			}

			$data[ $key ] = '<removed by Simple History>';
		}

		return $data;
	}
}
