Make the adapter responsible for keeping track of the last modified date

README.md

@@ -4,7 +4,7 @@ Contributors: alleyinteractive
 
 Tags: alleyinteractive, wp-video-sync
 
-Stable tag: 0.0.0
+Stable tag: 0.1.0
 
 Requires at least: 6.6
 
@@ -18,6 +18,10 @@ License: GPL v2 or later
 
 Sync videos from a hosting provider to WordPress.
 
+Runs a scheduled task to sync videos from a supported video hosting provider to WordPress in batches based on the last modified date of the video. Implementers are responsible for installing and configuring a compatible plugin, choosing it as an adapter, and defining the callback that will be run for each video, which will be responsible for performing any post creations or updates in WordPress.
+
+This plugin is a great way to sync videos uploaded to a hosting provider (such as JW Player) to WordPress, such that the video itself remains on the hosting provider, but the video can be displayed in WordPress using a player block or shortcode, appears at its own unique URL, and can be included in search results.
+
 ## Installation
 
 You can install the package via Composer:
@@ -31,11 +35,44 @@ composer require alleyinteractive/wp-video-sync
 Activate the plugin in WordPress and use it like so:
 
 ```php
-$video_sync = new Alley\WP\WP_Video_Sync\Sync_Manager()->with_jw_player_7_for_wp();
+use Alley\WP\WP_Video_Sync\Adapters\JW_Player_7_For_WP;
+use Alley\WP\WP_Video_Sync\Sync_Manager;
+use DateTimeImmutable;
+use WP_Query;
+
+$sync_manager = Sync_Manager::init()
+	->with_adapter( new JW_Player_7_For_WP() )
+	->with_frequency( 'hourly' )
+	->with_callback(
+		function ( $video ) {
+			$existing_video = new WP_Query( [ 'meta_key' => 'jwplayer_id', 'meta_value' => $video->id ] );
+			$existing_id    = $existing_video->posts[0]->ID ?? 0;
+			wp_insert_post(
+				[
+					'ID'            => $existing_id,
+					'post_title'    => $video->metadata->title,
+					'post_date'     => DateTimeImmutable::createFromFormat( DATE_W3C, $video->created )->format( 'Y-m-d H:i:s' ),
+					'post_modified' => DateTimeImmutable::createFromFormat( DATE_W3C, $video->last_modified )->format( 'Y-m-d H:i:s' ),
+					'meta_input'    => [
+						'jwplayer_id' => $video->id,
+					],
+				]
+			);
+		}
+	);
 ```
 
+This will configure the plugin to import a batch of 100 videos every hour from JW Player, sorted by least to most recently updated, starting with the date and time of the last video that was updated. If videos have already been imported (as identified by the postmeta value saved for the unique video ID) they will be updated rather than created. New videos will be created. The example code above uses the `post` post type for this purpose, but the code could easily be adapted to use a custom post type. Additionally, the post content could be set to include a Gutenberg block or a shortcode for a player.
+
+### Supported Adapters
+
 As of now, the plugin only supports JW Player 7 for WordPress (both the free and premium versions). Other adapters may be added in the future.
 
+#### JW Player 7 for WordPress
+
+- Requires the [JW Player 7 for WordPress](https://wordpress.org/plugins/jw-player-7-for-wp/) plugin to be installed, activated, and properly configured with access credentials. Also supports the premium version.
+- The video object in the callback is a `stdClass` with the properties described in the `media` object under response code `200` in [the JW Player API documentation for the media list endpoint](https://docs.jwplayer.com/platform/reference/get_v2-sites-site-id-media).
+
 ## Releasing the Plugin
 
 New versions of this plugin will be created as releases in GitHub once ready.

src/adapters/class-jw-player-7-for-wp.php

@@ -15,6 +15,22 @@
  * JW Player 7 for WP Adapter. Supports both the free and premium versions of the plugin.
  */
 class JW_Player_7_For_WP implements Adapter {
+	/**
+	 * The date of the last modification to the last batch of videos.
+	 *
+	 * @var DateTimeImmutable
+	 */
+	private DateTimeImmutable $last_modified_date;
+
+	/**
+	 * Fetches the date of the last modification to the last batch of videos.
+	 *
+	 * @return ?DateTimeImmutable
+	 */
+	public function get_last_modified_date(): ?DateTimeImmutable {
+		return $this->last_modified_date;
+	}
+
 	/**
 	 * Fetches videos from JW Player that were modified after the provided DateTime.
 	 *
@@ -32,7 +48,17 @@ public function get_videos( DateTimeImmutable $updated_after ): array {
 					$updated_after->format( 'Y-m-d' )
 				)
 			);
-			return $result->media ?? [];
+			$videos = $result->media ?? [];
+
+			// Attempt to set the last modified date.
+			if ( isset( $videos[ count( $videos ) - 1 ]->last_modified ) ) {
+				$last_modified_date = DateTimeImmutable::createFromFormat( DATE_W3C, $videos[ count( $videos ) - 1 ]->last_modified );
+				if ( $last_modified_date instanceof DateTimeImmutable ) {
+					$this->last_modified_date = $last_modified_date;
+				}
+			}
+
+			return $videos;
 		}
 
 		return [];

src/class-sync-manager.php

@@ -99,11 +99,9 @@ public function sync_videos(): void {
 		}
 
 		// Try to update the last sync time to the last modified time of the last video that was processed.
-		if ( isset( $video->last_modified ) && is_string( $video->last_modified ) ) {
-			$check = DateTimeImmutable::createFromFormat( DATE_W3C, $video->last_modified );
-			if ( $check instanceof DateTimeImmutable ) {
-				update_option( self::LAST_SYNC_OPTION, $video->last_modified );
-			}
+		$next_last_modified = $this->adapter->get_last_modified_date();
+		if ( $next_last_modified instanceof DateTimeImmutable ) {
+			update_option( self::LAST_SYNC_OPTION, $next_last_modified->format( DATE_W3C ) );
 		}
 	}
 

src/interfaces/adapter.php

@@ -14,6 +14,13 @@
  * Defines an interface that all adapters must implement.
  */
 interface Adapter {
+	/**
+	 * Fetches the date of the last modification to the last batch of videos.
+	 *
+	 * @return ?DateTimeImmutable
+	 */
+	public function get_last_modified_date(): ?DateTimeImmutable;
+
 	/**
 	 * Fetches videos from the provider that were modified after the provided DateTime.
 	 *