package net.pterodactylus.rhynodge.filters.webpages.savoy

import net.pterodactylus.rhynodge.Merger
import net.pterodactylus.rhynodge.State
import org.apache.log4j.Logger

class SavoyMerger : Merger {

	override fun mergeStates(previousState: State, currentState: State): State {
		previousState as? MovieState ?: throw IllegalArgumentException("previousState is not a MovieState")
		currentState as? MovieState ?: throw IllegalArgumentException("currentState is not a MovieState")
		logger.debug("previousState: $previousState")
		logger.debug("currentState: $currentState")

		val newMovies = currentState.movies
			.filter { it.name !in previousState.movies.map(Movie::getName) }
		logger.debug("newMovies: $newMovies")

		val hasChangedPerformances = newMovies.isNotEmpty() ||
				previousState.movies.map { movie -> movie.name to movie.performances.map { performance -> performance.time.toLocalDate() }.distinct().sorted() }.sortedBy(Pair<String, *>::first) !=
				currentState.movies.map { movie -> movie.name to movie.performances.map { performance -> performance.time.toLocalDate() }.distinct().sorted() }.sortedBy(Pair<String, *>::first)
		logger.debug("hasChangedPerformances: $hasChangedPerformances")

		return MovieState(currentState.movies, newMovies, hasChangedPerformances)
	}

}

private val logger = Logger.getLogger(SavoyMerger::class.java)