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<!DOCTYPE html>
<html>
<?php
namespace Simply_Static;

/**
 * Class which handles fetch url task.
 */
class Fetch_Urls_Task extends Task {

	/**
	 * Task name.
	 *
	 * @var string
	 */
	protected static $task_name = 'fetch_urls';

	/**
	 * Constructor
	 */
	public function __construct() {
		parent::__construct();

		$this->archive_dir        = $this->options->get_archive_dir();
		$this->archive_start_time = $this->options->get( 'archive_start_time' );
	}

	/**
	 * Fetch and save pages for the static archive
	 *
	 * @return boolean|WP_Error true if done, false if not done, WP_Error if error.
	 */
	public function perform() {
		$batch_size = apply_filters( 'simply_static_fetch_urls_batch_size', 10 );

		$static_pages = apply_filters(
			'ss_static_pages',
			Page::query()
			->where( 'last_checked_at < ? OR last_checked_at IS NULL', $this->archive_start_time )
			->limit( $batch_size )
			->find(),
			$this->archive_start_time
		);

		$pages_remaining = apply_filters(
			'ss_remaining_pages',
			Page::query()
			->where( 'last_checked_at < ? OR last_checked_at IS NULL', $this->archive_start_time )
			->count(),
			$this->archive_start_time
		);

		$total_pages = apply_filters( 'ss_total_pages', Page::query()->count() );

		$pages_processed = $total_pages - $pages_remaining;
		Util::debug_log( "Total pages: " . $total_pages . '; Pages remaining: ' . $pages_remaining );

		while ( $static_page = array_shift( $static_pages ) ) {
			Util::debug_log( "URL: " . $static_page->url );

			$excludable = $this->find_excludable( $static_page );
			if ( $excludable !== false ) {
				$save_file = $excludable['do_not_save'] !== '1';
				$follow_urls = $excludable['do_not_follow'] !== '1';
				Util::debug_log( "Excludable found: URL: " . $excludable['url'] . ' DNS: ' . $excludable['do_not_save'] . ' DNF: ' .$excludable['do_not_follow'] );
			} else {
				$save_file = true;
				$follow_urls = true;
				Util::debug_log( "URL is not being excluded" );
			}

			// If we're not saving a copy of the page or following URLs on that
			// page, then we don't need to bother fetching it.
			if ( $save_file === false && $follow_urls === false ) {
				Util::debug_log( "Skipping URL because it is no-save and no-follow" );
				$static_page->last_checked_at = Util::formatted_datetime();
				$static_page->set_status_message( __( "Do not save or follow", 'simply-static' ) );
				$static_page->save();
				continue;
			} else {
				$success = Url_Fetcher::instance()->fetch( $static_page );
			}

			if ( ! $success ) {
				continue;
			}

			// If we get a 30x redirect...
			if ( in_array( $static_page->http_status_code, array( 301, 302, 303, 307, 308 ) ) ) {
				$this->handle_30x_redirect( $static_page, $save_file, $follow_urls );
				continue;
			}

			// Not a 200 for the response code? Move on.
			if ( $static_page->http_status_code != 200 ) {
				continue;
			}

			$this->handle_200_response( $static_page, $save_file, $follow_urls );
		}

		$message = sprintf( __( "Fetched %d of %d pages/files", 'simply-static' ), $pages_processed, $total_pages );
		$this->save_status_message( $message );

		// if we haven't processed any additional pages, we're done.
		return $pages_remaining == 0;
	}

	/**
	 * Process the response for a 200 response (success)
	 *
	 * @param  Simply_Static\Page $static_page Record to update.
	 * @param  boolean            $save_file   Save a static copy of the page.
	 * @param  boolean            $follow_urls Save found URLs to database.
	 * @return void
	 */
	protected function handle_200_response( $static_page, $save_file, $follow_urls ) {
		if ( $save_file || $follow_urls ) {
			Util::debug_log( "Extracting URLs and replacing URLs in the static file" );
			// Fetch all URLs from the page and add them to the queue...
			$extractor = new Url_Extractor( $static_page );
			$urls = $extractor->extract_and_update_urls();
		}

		if ( $follow_urls ) {
			Util::debug_log( "Adding " . sizeof( $urls ) . " URLs to the queue" );
			foreach ( $urls as $url ) {
				$this->set_url_found_on( $static_page, $url );
			}
		} else {
			Util::debug_log( "Not following URLs from this page" );
			$static_page->set_status_message( __( "Do not follow", 'simply-static' ) );
		}

		$file = $this->archive_dir . $static_page->file_path;
		if ( $save_file ) {
			Util::debug_log( "We're saving this URL; keeping the static file" );
			$sha1 = sha1_file( $file );

			// if the content is identical, move on to the next file
			if ( $static_page->is_content_identical( $sha1 ) ) {
				// continue;
			} else {
				$static_page->set_content_hash( $sha1 );
			}
		} else {
			Util::debug_log( "Not saving this URL; deleting the static file" );
			unlink( $file ); // delete saved file
			$static_page->file_path = null;
			$static_page->set_status_message( __( "Do not save", 'simply-static' ) );
		}

		$static_page->save();
	}

	/**
	 * Process the response to a 30x redirection
	 * @param  Simply_Static\Page         $static_page Record to update
	 * @param  boolean            $save_file   Save a static copy of the page?
	 * @param  boolean            $follow_urls   Save redirect URL to database?
	 * @return void
	 */
	protected function handle_30x_redirect( $static_page, $save_file, $follow_urls ) {
		$origin_url = Util::origin_url();
		$destination_url = $this->options->get_destination_url();
		$current_url = $static_page->url;
		$redirect_url = $static_page->redirect_url;

		Util::debug_log( "redirect_url: " . $redirect_url );

		// convert our potentially relative URL to an absolute URL
		$redirect_url = Util::relative_to_absolute_url( $redirect_url, $current_url );

		if ( $redirect_url ) {
			// WP likes to 301 redirect `/path` to `/path/` -- we want to
			// check for this and just add the trailing slashed version
			if ( $redirect_url === trailingslashit( $current_url ) || untrailingslashit($redirect_url) === untrailingslashit($current_url) ) {
				Util::debug_log( "This is a redirect to a trailing slashed version of the same page; adding new URL to the queue" );
				$this->set_url_found_on( $static_page, $redirect_url );

			// Don't create a redirect page if it's just a redirect from
			// http to https. Instead just add the new url to the queue.
			// TODO: Make this less horrible.
			} else if (
			Util::strip_index_filenames_from_url( Util::remove_params_and_fragment( Util::strip_protocol_from_url( $redirect_url ) ) ) ===
			Util::strip_index_filenames_from_url( Util::remove_params_and_fragment( Util::strip_protocol_from_url( $current_url ) ) ) ) {

				Util::debug_log( "This looks like a redirect from http to https (or visa versa); adding new URL to the queue" );
				$this->set_url_found_on( $static_page, $redirect_url );

			} else {
				// check if this is a local URL
				if ( Util::is_local_url( $redirect_url ) ) {

					if ( $follow_urls ) {
						Util::debug_log( "Redirect URL is on the same domain; adding the URL to the queue" );
						$this->set_url_found_on( $static_page, $redirect_url );
					} else {
						Util::debug_log( "Not following the redirect URL for this page" );
						$static_page->set_status_message( __( "Do not follow", 'simply-static' ) );
					}
					// and update the URL
					$redirect_url = str_replace( $origin_url, $destination_url, $redirect_url );

				}

				if ( $save_file ) {
					Util::debug_log( "Creating a redirect page" );

					$view = new View();

					$content = $view->set_template( 'redirect' )
						->assign( 'redirect_url', $redirect_url )
						->render_to_string();

					$filename = $this->save_static_page_content_to_file( $static_page, $content );
					if ( $filename ) {
						$static_page->file_path = $filename;
					}

					$sha1 = sha1_file( $this->archive_dir . $filename );

					// if the content is identical, move on to the next file
					if ( $static_page->is_content_identical( $sha1 ) ) {
						// continue;
					} else {
						$static_page->set_content_hash( $sha1 );
					}
				} else {
					Util::debug_log( "Not creating a redirect page" );
					$static_page->set_status_message( __( "Do not save", 'simply-static' ) );
				}

				$static_page->save();
			}
		}
	}

	/**
	 * Find executeable.
	 *
	 * @param object $static_page current page.
	 * @return bool
	 */
	protected function find_excludable( $static_page ) {
		$url         = $static_page->url;
		$excludables = array();

		foreach ( $this->options->get( 'urls_to_exclude' ) as $excludable ) {
			// using | as the delimiter for regex instead of the traditional /
			// because | won't show up in a path (it would have to be url-encoded)
			$regex = '|' . $excludable['url'] .  '|';
			$result = preg_match( $regex, $url );
			if ( $result === 1 ) {
				return $excludable;
			}
		}
		return false;
	}

	/**
	 * Set ID for which page a URL was found on (& create page if not in DB yet)
	 *
	 * Given a URL, find the associated Simply_Static\Page, and then set the ID
	 * for which page it was found on if the ID isn't yet set or if the record
	 * hasn't been updated in this instance of static generation yet.
	 *
	 * @param Simply_Static\Page $static_page The record for the parent page.
	 * @param string             $child_url   The URL of the child page.
	 * @param string             $start_time  Static generation start time.
	 * @return void
	 */
	protected function set_url_found_on( $static_page, $child_url ) {
		$child_static_page = Page::query()->find_or_create_by( 'url' , $child_url );
		if ( $child_static_page->found_on_id === null || $child_static_page->updated_at < $this->archive_start_time ) {
			$child_static_page->found_on_id = $static_page->id;
			$child_static_page->save();
		}
	}

	/**
	 * Save the contents of a page to a file in our archive directory
	 *
	 * @param Simply_Static\Page $static_page The Simply_Static\Page record.
	 * @param string             $content The content of the page we want to save.
	 * @return string|null                The file path of the saved file.
	 */
	protected function save_static_page_content_to_file( $static_page, $content ) {
		$relative_filename = Url_Fetcher::instance()->create_directories_for_static_page( $static_page );

		if ( $relative_filename ) {
			$file_path = $this->archive_dir . $relative_filename;

			$write = file_put_contents( $file_path, $content );
			if ( $write === false ) {
				$static_page->set_error_message( 'Unable to write temporary file' );
			} else {
				return $relative_filename;
			}
		} else {
			return null;
		}
	}
}