<?php


namespace Action_Scheduler\WP_CLI;

use Action_Scheduler\Migration\Config;
use Action_Scheduler\Migration\Runner;
use Action_Scheduler\Migration\Scheduler;
use Action_Scheduler\Migration\Controller;
use WP_CLI;
use WP_CLI_Command;

/**
 * Class Migration_Command
 *
 * @package Action_Scheduler\WP_CLI
 *
 * @since 3.0.0
 *
 * @codeCoverageIgnore
 */
class Migration_Command extends WP_CLI_Command {

	/** @var int */
	private $total_processed = 0;

	/**
	 * Register the command with WP-CLI
	 */
	public function register() {
		if ( ! defined( 'WP_CLI' ) || ! WP_CLI ) {
			return;
		}

		WP_CLI::add_command(
			'action-scheduler migrate',
			[ $this, 'migrate' ],
			[
				'shortdesc' => 'Migrates actions to the DB tables store',
				'synopsis'  => [
					[
						'type'        => 'assoc',
						'name'        => 'batch-size',
						'optional'    => true,
						'default'     => 100,
						'description' => 'The number of actions to process in each batch',
					],
					[
						'type'        => 'assoc',
						'name'        => 'free-memory-on',
						'optional'    => true,
						'default'     => 50,
						'description' => 'The number of actions to process between freeing memory. 0 disables freeing memory',
					],
					[
						'type'        => 'assoc',
						'name'        => 'pause',
						'optional'    => true,
						'default'     => 0,
						'description' => 'The number of seconds to pause when freeing memory',
					],
					[
						'type'        => 'flag',
						'name'        => 'dry-run',
						'optional'    => true,
						'description' => 'Reports on the actions that would have been migrated, but does not change any data',
					],
				],
			]
		);
	}

	/**
	 * Process the data migration.
	 *
	 * @param array $positional_args Required for WP CLI. Not used in migration.
	 * @param array $assoc_args Optional arguments.
	 *
	 * @return void
	 */
	public function migrate( $positional_args, $assoc_args ) {
		$this->init_logging();

		$config = $this->get_migration_config( $assoc_args );
		$runner = new Runner( $config );
		$runner->init_destination();

		$batch_size = isset( $assoc_args['batch-size'] ) ? (int) $assoc_args['batch-size'] : 100;
		$free_on    = isset( $assoc_args['free-memory-on'] ) ? (int) $assoc_args['free-memory-on'] : 50;
		$sleep      = isset( $assoc_args['pause'] ) ? (int) $assoc_args['pause'] : 0;
		\ActionScheduler_DataController::set_free_ticks( $free_on );
		\ActionScheduler_DataController::set_sleep_time( $sleep );

		do {
			$actions_processed      = $runner->run( $batch_size );
			$this->total_processed += $actions_processed;
		} while ( $actions_processed > 0 );

		if ( ! $config->get_dry_run() ) {
			// let the scheduler know that there's nothing left to do
			$scheduler = new Scheduler();
			$scheduler->mark_complete();
		}

		WP_CLI::success( sprintf( '%s complete. %d actions processed.', $config->get_dry_run() ? 'Dry run' : 'Migration', $this->total_processed ) );
	}

	/**
	 * Build the config object used to create the Runner
	 *
	 * @param array $args Optional arguments.
	 *
	 * @return ActionScheduler\Migration\Config
	 */
	private function get_migration_config( $args ) {
		$args = wp_parse_args(
			$args,
			[
				'dry-run' => false,
			]
		);

		$config = Controller::instance()->get_migration_config_object();
		$config->set_dry_run( ! empty( $args['dry-run'] ) );

		return $config;
	}

	/**
	 * Hook command line logging into migration actions.
	 */
	private function init_logging() {
		add_action(
			'action_scheduler/migrate_action_dry_run',
			function ( $action_id ) {
				WP_CLI::debug( sprintf( 'Dry-run: migrated action %d', $action_id ) );
			},
			10,
			1
		);
		add_action(
			'action_scheduler/no_action_to_migrate',
			function ( $action_id ) {
				WP_CLI::debug( sprintf( 'No action found to migrate for ID %d', $action_id ) );
			},
			10,
			1
		);
		add_action(
			'action_scheduler/migrate_action_failed',
			function ( $action_id ) {
				WP_CLI::warning( sprintf( 'Failed migrating action with ID %d', $action_id ) );
			},
			10,
			1
		);
		add_action(
			'action_scheduler/migrate_action_incomplete',
			function ( $source_id, $destination_id ) {
				WP_CLI::warning( sprintf( 'Unable to remove source action with ID %d after migrating to new ID %d', $source_id, $destination_id ) );
			},
			10,
			2
		);
		add_action(
			'action_scheduler/migrated_action',
			function ( $source_id, $destination_id ) {
				WP_CLI::debug( sprintf( 'Migrated source action with ID %d to new store with ID %d', $source_id, $destination_id ) );
			},
			10,
			2
		);
		add_action(
			'action_scheduler/migration_batch_starting',
			function ( $batch ) {
				WP_CLI::debug( 'Beginning migration of batch: ' . print_r( $batch, true ) );
			},
			10,
			1
		);
		add_action(
			'action_scheduler/migration_batch_complete',
			function ( $batch ) {
				WP_CLI::log( sprintf( 'Completed migration of %d actions', count( $batch ) ) );
			},
			10,
			1
		);
	}
}
