<?php
/** Shared working period editor. @package Abientot */
namespace Abientot\Admin;
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
use Abientot\Support\ScheduleIntervals;
final class ScheduleEditor {
	public static function from_rules( array $rules ): array {
		$out = array();
		foreach ( range( 0, 6 ) as $day ) {
			$working = array();
			$breaks  = array();
			foreach ( $rules as $rule ) {
				if ( (int) $rule['weekday'] !== $day || ! in_array( $rule['rule_type'], array( 'working', 'break' ), true ) ) {
					continue;
				}
				$period = ScheduleIntervals::period_offsets(
					array(
						'periods' => array(
							array(
								'start_time' => $rule['start_time'],
								'end_time'   => $rule['end_time']
							)
						)
					)
				)[0];
				if ( 'break' === $rule['rule_type'] ) {
					$breaks[] = $period;
				} else {
							$working[] = $period;
				}
			}
			usort( $working, static fn( $a, $b )=>$a['start'] <=> $b['start'] );
			$merged = array();
			foreach ( $working as $window ) {
				$key = array_key_last( $merged );
				if ( null === $key || $merged[ $key ]['end'] <= $window['start'] ) {
							$merged[] = $window;
				} else {
							$merged[ $key ]['end'] = max( $merged[ $key ]['end'], $window['end'] );
				}
			}
			$working = $merged;
			foreach ( $breaks as $break ) {
				foreach ( $working as $window ) {
					if ( $window['end'] > 86400 && $break['start'] < $window['start'] && $break['end'] + 86400 <= $window['end'] ) {
						$break['start'] += 86400;
						$break['end']   += 86400;
						break;
					}
				}
				$working = ScheduleIntervals::subtract( $working, $break );
			}
			$periods = array();
			foreach ( $working as $window ) {
				// An overlapping legacy union can reach a full day: use unequal endpoints.
				while ( $window['end'] - $window['start'] >= 86400 ) {
					$end             = $window['start'] + 43200;
					$periods[]       = self::offset_period( $window['start'], $end );
					$window['start'] = $end;
				}
				$periods[] = self::offset_period( $window['start'], $window['end'] );
			}
			$out[ $day ] = array( 'periods' => $periods );
		}
		return $out;
	}
	private static function offset_period( int $start, int $end ): array {
		return array(
			'start_time' => sprintf( '%02d:%02d:00', intdiv( $start % 86400, 3600 ), intdiv( $start % 3600, 60 ) ),
			'end_time'   => sprintf( '%02d:%02d:00', intdiv( $end % 86400, 3600 ), intdiv( $end % 3600, 60 ) ),
			'day_offset' => intdiv( $start, 86400 )
		);
	}
	public static function posted( array $schedule ): array {
		foreach ( array_keys( $schedule ) as $key ) {
			if ( ! preg_match( '/^[0-6]$/D', (string) $key ) ) {
				throw new \InvalidArgumentException( 'Invalid weekday.' );
			}
		}
		$out = array();
		foreach ( range( 0, 6 ) as $day ) {
			$row = $schedule[ $day ] ?? array();
			if ( ! is_array( $row ) ) {
				throw new \InvalidArgumentException( 'Invalid schedule.' );
			}
			$out[ $day ] = self::posted_day( $row );
		}
		return $out;
	}
	public static function posted_day( array $row ): array {
		if ( array_key_exists( 'periods', $row ) || isset( $row['periods_present'] ) ) {
			if ( isset( $row['enabled_present'] ) && empty( $row['enabled'] ) ) {
				return array( 'periods' => array() );
			}
			return ScheduleIntervals::normalize_entry( array( 'periods' => $row['periods'] ?? array() ) );
		}
		$enabled = $row['enabled'] ?? $row['working_enabled'] ?? null;
		if ( empty( $enabled ) ) {
			return array( 'periods' => array() );
		}
		$entry = array(
			'working' => array(
				'start_time' => $row['start'] ?? $row['working_start'] ?? '',
				'end_time'   => $row['end'] ?? $row['working_end'] ?? ''
			)
		);
		if ( ! empty( $row['break_enabled'] ) ) {
			$entry['break'] = array(
				'start_time' => $row['break_start'] ?? '',
				'end_time'   => $row['break_end'] ?? ''
			);
		}
		return ScheduleIntervals::normalize_entry( $entry );
	}
	public static function render( string $name, array $schedule, ?array $labels = null ): void {
		if ( null === $labels ) {
			$labels = array();
			foreach ( \Abientot\Support\Locale::weekday_order() as $day ) {
				$labels[ $day ] = \Abientot\Support\Locale::date( 'l', strtotime( '2024-01-07 +' . $day . ' days UTC' ), new \DateTimeZone( 'UTC' ) );
			}
		}
		echo '<div class="abientot-schedule-editor" data-schedule-editor>';
		echo '<p class="description">' . esc_html__( 'Add working periods. Gaps are breaks. An end earlier than its start is on the next day.', 'abientot' ) . '</p>';
		foreach ( $labels as $day => $label ) {
			$entry = ScheduleIntervals::normalize_entry( $schedule[ $day ] ?? array() );
			echo '<fieldset class="abientot-schedule-day" data-schedule-day><legend>' . esc_html( $label ) . '</legend><input type="hidden" name="' . esc_attr( $name . '[' . $day . '][enabled_present]' ) . '" value="1"><label><input type="checkbox" data-schedule-enabled name="' . esc_attr( $name . '[' . $day . '][enabled]' ) . '" value="1" ' . checked( ! empty( $entry['periods'] ), true, false ) . '> ' . esc_html__( 'Working', 'abientot' ) . '</label>';
			self::day( $name . '[' . $day . ']', $entry, $label, true );
			echo '</fieldset>';
		}
		echo '</div>';
	}
	public static function day( string $name, array $entry, string $label, bool $copy = false ): void {
		$entry = ScheduleIntervals::normalize_entry( $entry );
		echo '<div class="abientot-period-editor" data-period-editor data-period-error="' . esc_attr__( 'Choose different start and end times.', 'abientot' ) . '" data-period-name="' . esc_attr( $name ) . '"><input type="hidden" name="' . esc_attr( $name . '[periods_present]' ) . '" value="1"><div data-period-list>';
		foreach ( $entry['periods'] as $index => $period ) {
			self::row( $name, (string) $index, $period, $label );
		}
		echo '</div><template data-period-template>';
		self::row(
			$name,
			'__INDEX__',
			array(
				'start_time' => '09:00:00',
				'end_time'   => '17:00:00'
			),
			$label
		);
		echo '</template><span data-period-status role="status" aria-live="polite"></span><div class="abientot-schedule-actions"><button type="button" class="button" data-period-add>' . esc_html__( 'Add period', 'abientot' ) . '</button>';
		if ( $copy ) {
			echo '<button type="button" class="button" data-period-copy>' . esc_html__( 'Apply to all working days', 'abientot' ) . '</button>';
		}
		echo '</div></div>';
	}
	private static function row( string $name, string $index, array $period, string $label ): void {
		echo '<div class="abientot-working-period" data-working-period>';
		foreach ( array(
			'start_time' => __( 'Start', 'abientot' ),
			'end_time'   => __( 'End', 'abientot' )
		) as $key => $title ) {
			echo '<label>' . esc_html( $title ) . ' <input type="time" step="60" data-period-time="' . esc_attr( $key ) . '" name="' . esc_attr( $name . '[periods][' . $index . '][' . $key . ']' ) . '" aria-label="' . esc_attr( $label . ' — ' . $title ) . '" value="' . esc_attr( substr( $period[ $key ], 0, 5 ) ) . '" required></label>';
		}
		echo '<input type="hidden" name="' . esc_attr( $name . '[periods][' . $index . '][day_offset]' ) . '" value="' . esc_attr( (string) ( $period['day_offset'] ?? 0 ) ) . '"><span data-period-next-start-day ' . ( empty( $period['day_offset'] ) ? 'hidden' : '' ) . '>' . esc_html__( 'This period starts on the next day.', 'abientot' ) . '</span><span data-period-next-day>' . esc_html__( 'Next day', 'abientot' ) . '</span><button type="button" class="button" data-period-remove>' . esc_html__( 'Remove', 'abientot' ) . '</button></div>';
	}
}