<?php

declare(strict_types=1);

namespace LinkCheckup\Features\Fixes;

use function array_pop;
use function max;

final class FixProgress {

	/** @param list<JournalEntry> $journal */
	public function __construct(
		public readonly FixState $state,
		public readonly int $links_done,
		public readonly int $places_total,
		public readonly int $places_done,
		public readonly int $places_failed,
		public readonly array $journal
	) {
	}

	public function with_state( FixState $state ): self {
		return new self(
			$state,
			$this->links_done,
			$this->places_total,
			$this->places_done,
			$this->places_failed,
			$this->journal
		);
	}

	public function with_links_done( int $links_done ): self {
		return new self(
			$this->state,
			max( 0, $links_done ),
			$this->places_total,
			$this->places_done,
			$this->places_failed,
			$this->journal
		);
	}

	public function with_place( JournalEntry $entry ): self {
		$is_changed    = null !== $entry->content_before_fix;
		$places_done   = $this->places_done + ( $is_changed ? 1 : 0 );
		$places_failed = $this->places_failed + ( $is_changed ? 0 : 1 );

		return new self(
			$this->state,
			$this->links_done,
			max( $this->places_total, $places_done + $places_failed ),
			$places_done,
			$places_failed,
			array( ...$this->journal, $entry )
		);
	}

	public function without_last_place(): self {
		$journal    = $this->journal;
		$entry      = array_pop( $journal );
		$is_changed = null !== $entry?->content_before_fix;

		return new self(
			$this->state,
			$this->links_done,
			$this->places_total,
			max( 0, $this->places_done - ( $is_changed ? 1 : 0 ) ),
			max( 0, $this->places_failed - ( $is_changed ? 0 : 1 ) ),
			$journal
		);
	}

	public function has_unchanged_place_of( int $link_id ): bool {
		foreach ( $this->journal as $entry ) {
			if ( $link_id === $entry->link_id
				&& null === $entry->content_before_fix ) {
				return true;
			}
		}

		return false;
	}

	public function places_handled(): int {
		return $this->places_done + $this->places_failed;
	}

	/** @return list<int> */
	public function posts_journaled_for( int $link_id ): array {
		$post_ids = array();

		foreach ( $this->journal as $entry ) {
			if ( $link_id === $entry->link_id ) {
				$post_ids[] = $entry->post_id;
			}
		}

		return $post_ids;
	}
}