<?php

namespace WPContentSync\Url;

final class UrlMapping {
	private string $source_url;
	private string $destination_url;

	public function __construct( string $source_url, string $destination_url ) {
		$source_url      = $this->normalizeUrl( $source_url );
		$destination_url = $this->normalizeUrl( $destination_url );

		if ( '' === $source_url || '' === $destination_url ) {
			throw new \InvalidArgumentException( 'Source and destination URLs are required.' );
		}

		if ( ! $this->isAbsoluteUrl( $source_url ) || ! $this->isAbsoluteUrl( $destination_url ) ) {
			throw new \InvalidArgumentException( 'Source and destination URLs must include a scheme and host.' );
		}

		$this->source_url      = $source_url;
		$this->destination_url = $destination_url;
	}

	public function sourceUrl(): string {
		return $this->source_url;
	}

	public function destinationUrl(): string {
		return $this->destination_url;
	}

	private function normalizeUrl( string $url ): string {
		$url   = trim( $url );
		$parts = wp_parse_url( $url );

		if ( ! is_array( $parts ) || ! isset( $parts['path'] ) || '/' !== $parts['path'] ) {
			return $url;
		}

		unset( $parts['path'] );

		return $this->buildUrl( $parts );
	}

	private function isAbsoluteUrl( string $url ): bool {
		$parts = wp_parse_url( $url );

		return is_array( $parts ) && ! empty( $parts['scheme'] ) && ! empty( $parts['host'] );
	}

	/**
	 * @param array<string, mixed> $parts URL parts.
	 */
	private function buildUrl( array $parts ): string {
		$url = (string) $parts['scheme'] . '://';

		if ( isset( $parts['user'] ) ) {
			$url .= (string) $parts['user'];

			if ( isset( $parts['pass'] ) ) {
				$url .= ':' . (string) $parts['pass'];
			}

			$url .= '@';
		}

		$url .= (string) $parts['host'];

		if ( isset( $parts['port'] ) ) {
			$url .= ':' . (string) $parts['port'];
		}

		if ( isset( $parts['query'] ) ) {
			$url .= '?' . (string) $parts['query'];
		}

		if ( isset( $parts['fragment'] ) ) {
			$url .= '#' . (string) $parts['fragment'];
		}

		return $url;
	}
}