package com.commafeed;

import java.time.Duration;
import java.time.Instant;
import java.util.Optional;

import com.commafeed.backend.feed.FeedRefreshIntervalCalculator;

import io.quarkus.runtime.configuration.MemorySize;
import io.smallrye.config.ConfigMapping;
import io.smallrye.config.WithDefault;
import jakarta.validation.constraints.Min;
import jakarta.validation.constraints.NotBlank;
import jakarta.validation.constraints.Positive;

/**
 * CommaFeed configuration
 *
 * Default values are for production, they can be overridden in application.properties
 */
@ConfigMapping(prefix = "commafeed")
public interface CommaFeedConfiguration {

	/**
	 * URL used to access commafeed, used for various redirects.
	 * 
	 */
	@NotBlank
	@WithDefault("http://localhost:8082")
	String publicUrl();

	/**
	 * Whether to expose a robots.txt file that disallows web crawlers and search engine indexers.
	 */
	@WithDefault("true")
	boolean hideFromWebCrawlers();

	/**
	 * If enabled, images in feed entries will be proxied through the server instead of accessed directly by the browser.
	 * 
	 * This is useful if commafeed is accessed through a restricting proxy that blocks some feeds that are followed.
	 */
	@WithDefault("false")
	boolean imageProxyEnabled();

	/**
	 * Enable password recovery via email.
	 *
	 * Quarkus mailer will need to be configured.
	 */
	@WithDefault("false")
	boolean passwordRecoveryEnabled();

	/**
	 * Message displayed in a notification at the bottom of the page.
	 */
	Optional<String> announcement();

	/**
	 * Google Analytics tracking code.
	 */
	Optional<String> googleAnalyticsTrackingCode();

	/**
	 * Google Auth key for fetching Youtube favicons.
	 */
	Optional<String> googleAuthKey();

	/**
	 * Feed refresh engine settings.
	 */
	FeedRefresh feedRefresh();

	/**
	 * Database settings.
	 */
	Database database();

	/**
	 * Users settings.
	 */
	Users users();

	/**
	 * Websocket settings.
	 */
	Websocket websocket();

	interface FeedRefresh {
		/**
		 * Amount of time CommaFeed will wait before refreshing the same feed.
		 */
		@WithDefault("5m")
		Duration interval();

		/**
		 * If true, CommaFeed will calculate the next refresh time based on the feed's average entry interval and the time since the last
		 * entry was published. See {@link FeedRefreshIntervalCalculator} for details.
		 */
		@WithDefault("false")
		boolean intervalEmpirical();

		/**
		 * Amount of http threads used to fetch feeds.
		 */
		@Min(1)
		@WithDefault("3")
		int httpThreads();

		/**
		 * Amount of threads used to insert new entries in the database.
		 */
		@Min(1)
		@WithDefault("1")
		int databaseThreads();

		/**
		 * If a feed is larger than this, it will be discarded to prevent memory issues while parsing the feed.
		 */
		@WithDefault("5M")
		MemorySize maxResponseSize();

		/**
		 * Duration after which a user is considered inactive. Feeds for inactive users are not refreshed until they log in again.
		 */
		@WithDefault("0")
		Duration userInactivityPeriod();

		/**
		 * User-Agent string that will be used by the http client, leave empty for the default one.
		 */
		Optional<String> userAgent();
	}

	interface Database {
		/**
		 * Database query timeout.
		 */
		@WithDefault("0")
		int queryTimeout();

		Cleanup cleanup();

		interface Cleanup {
			/**
			 * Maximum age of feed entries in the database. Older entries will be deleted. 0 to disable.
			 */
			@WithDefault("365d")
			Duration entriesMaxAge();

			/**
			 * Maximum age of feed entry statuses (read/unread) in the database. Older statuses will be deleted. 0 to disable.
			 */
			@WithDefault("0")
			Duration statusesMaxAge();

			/**
			 * Maximum number of entries per feed to keep in the database. 0 to disable.
			 */
			@WithDefault("500")
			int maxFeedCapacity();

			/**
			 * Limit the number of feeds a user can subscribe to. 0 to disable.
			 */
			@WithDefault("0")
			int maxFeedsPerUser();

			/**
			 * Rows to delete per query while cleaning up old entries.
			 */
			@Positive
			@WithDefault("100")
			int batchSize();

			default Instant statusesInstantThreshold() {
				return statusesMaxAge().toMillis() > 0 ? Instant.now().minus(statusesMaxAge()) : null;
			}
		}
	}

	interface Users {
		/**
		 * Whether to let users create accounts for themselves.
		 */
		@WithDefault("false")
		boolean allowRegistrations();

		/**
		 * Whether to enable strict password validation (1 uppercase char, 1 lowercase char, 1 digit, 1 special char).
		 */
		@WithDefault("true")
		boolean strictPasswordPolicy();

		/**
		 * Whether to create a demo account the first time the app starts.
		 */
		@WithDefault("false")
		boolean createDemoAccount();
	}

	interface Websocket {
		/**
		 * Enable websocket connection so the server can notify the web client that there are new entries for your feeds.
		 */
		@WithDefault("true")
		boolean enabled();

		/**
		 * Interval at which the client will send a ping message on the websocket to keep the connection alive.
		 */
		@WithDefault("15m")
		Duration pingInterval();

		/**
		 * If the websocket connection is disabled or the connection is lost, the client will reload the feed tree at this interval.
		 */
		@WithDefault("30s")
		Duration treeReloadInterval();
	}

}