<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class ANFOWO_Date_Resolver {

	/**
	 * Resolves a period string (e.g., 'this_month') to a start and end SQL date string.
	 *
	 * @param string|array $period Filter period.
	 * @param string $custom_start Custom start date.
	 * @param string $custom_end Custom end date.
	 *
	 * @return array
	 */
	public static function resolve( $period, $custom_start = '', $custom_end = '' ) {

		if ( is_array( $period ) ) {
			if ( isset( $period['start'] ) && isset( $period['end'] ) ) {
				return $period;
			}

			$custom_start = $period['start_date'] ?? '';
			$custom_end   = $period['end_date'] ?? '';
			$period       = $period['period'] ?? 'last_30_days';
		}

		if ( function_exists( 'current_datetime' ) ) {
			$current_time = current_datetime()->getTimestamp() + current_datetime()->getOffset();
		} else {
			$current_time = current_time( 'timestamp' );
		}

		$start = '';
		$end   = gmdate( 'Y-m-d 23:59:59', $current_time );

		switch ( $period ) {

			case 'today':
				$start = gmdate( 'Y-m-d 00:00:00', $current_time );
				break;

			case 'yesterday':
				$start = gmdate(
					'Y-m-d 00:00:00',
					strtotime( '-1 day', $current_time )
				);

				$end = gmdate(
					'Y-m-d 23:59:59',
					strtotime( '-1 day', $current_time )
				);
				break;

			case 'last_7_days':
				$start = gmdate(
					'Y-m-d 00:00:00',
					strtotime( '-7 days', $current_time )
				);
				break;

			case 'last_30_days':
				$start = gmdate(
					'Y-m-d 00:00:00',
					strtotime( '-30 days', $current_time )
				);
				break;

			case 'this_month':
				$start = gmdate( 'Y-m-01 00:00:00', $current_time );
				break;

			case 'last_month':
				$start = gmdate(
					'Y-m-01 00:00:00',
					strtotime( 'first day of last month', $current_time )
				);

				$end = gmdate(
					'Y-m-t 23:59:59',
					strtotime( 'last day of last month', $current_time )
				);
				break;

			case 'this_year':
				$start = gmdate( 'Y-01-01 00:00:00', $current_time );
				break;

			case 'last_year':
				$start = gmdate(
					'Y-01-01 00:00:00',
					strtotime( '-1 year', $current_time )
				);

				$end = gmdate(
					'Y-12-31 23:59:59',
					strtotime( '-1 year', $current_time )
				);
				break;

			case 'last_12_months':
				$start = gmdate(
					'Y-m-d 00:00:00',
					strtotime( '-12 months', $current_time )
				);
				break;

			case 'all_time':
				$start = '1970-01-01 00:00:00';
				break;

			case 'custom':

				if ( ! empty( $custom_start ) ) {
					$start = gmdate(
						'Y-m-d 00:00:00',
						strtotime( $custom_start )
					);
				} else {
					$start = '1970-01-01 00:00:00';
				}

				if ( ! empty( $custom_end ) ) {
					$end = gmdate(
						'Y-m-d 23:59:59',
						strtotime( $custom_end )
					);
				}

				break;

			default:
				$start = '1970-01-01 00:00:00';
				break;
		}

		return array(
			'start' => $start,
			'end'   => $end,
		);
	}
}