<?php

class WPML_TM_Jobs_Deadline_Estimate {

	const LATENCY_DAYS  = 1;
	const WORDS_PER_DAY = 1200;

	/** @var WPML_TM_Translatable_Element_Provider */
	private $translatable_element_provider;

	/** @var WPML_Translation_Jobs_Collection */
	private $translation_jobs_collection;

	public function __construct(
		WPML_TM_Translatable_Element_Provider $translatable_element_provider,
		WPML_Translation_Jobs_Collection $translation_jobs_collection
	) {
		$this->translatable_element_provider = $translatable_element_provider;
		$this->translation_jobs_collection   = $translation_jobs_collection;
	}

	/**
	 * @param array $basket
	 * @param array $translator_options
	 *
	 * @return string
	 */
	public function get( array $basket, array $translator_options ) {
		$pending_jobs = $this->get_pending_jobs_for_translator( $translator_options );

		$words_per_langs = $this->get_pending_words_per_langs( $pending_jobs );
		$words_per_langs = $this->add_basket_words_per_langs( $basket, $words_per_langs );

		$max_words_in_lang = 0;

		if ( $words_per_langs ) {
			$max_words_in_lang = max( $words_per_langs );
		}

		$estimated_days    = ceil( $max_words_in_lang / self::WORDS_PER_DAY );
		$estimated_days    += self::LATENCY_DAYS;
		return date( 'Y-m-d', strtotime( '+' . $estimated_days . ' day' ) );
	}

	private function get_pending_jobs_for_translator( array $translator_options ) {
		$translator_options['status'] = ICL_TM_IN_PROGRESS;
		$jobs_in_progress             = $this->translation_jobs_collection->get_jobs( $translator_options );
		$translator_options['status'] = ICL_TM_WAITING_FOR_TRANSLATOR;
		$jobs_waiting_for_translator  = $this->translation_jobs_collection->get_jobs( $translator_options );

		return array_merge( $jobs_in_progress, $jobs_waiting_for_translator );
	}

	/**
	 * @param array $pending_jobs
	 *
	 * @return int[]
	 */
	private function get_pending_words_per_langs( array $pending_jobs ) {
		$words_per_langs = array();

		/** @var WPML_Element_Translation_Job[] $pending_jobs */
		foreach ( $pending_jobs as $pending_job ) {
			if ( ! isset( $words_per_langs[ $pending_job->get_language_code() ] ) ) {
				$words_per_langs[ $pending_job->get_language_code() ] = 0;
			}

			$translatable_element = $this->translatable_element_provider->get_from_job( $pending_job );

			if ( $translatable_element ) {
				$words_per_langs[ $pending_job->get_language_code() ] += $translatable_element->get_words_count();
			}
		}

		return $words_per_langs;
	}

	/**
	 * @param array $basket
	 * @param int[] $words_per_langs
	 *
	 * @return int[]
	 */
	private function add_basket_words_per_langs( array $basket, array $words_per_langs ) {
		$element_types = array( 'post', 'string', 'package' );

		foreach ( $element_types as $element_type ) {
			if ( isset( $basket[ $element_type ] ) ) {
				foreach ( $basket[ $element_type ] as $element_id => $data ) {
					foreach ( $data['to_langs'] as $to_lang => $v ) {
						if ( ! isset( $words_per_langs[ $to_lang ] ) ) {
							$words_per_langs[ $to_lang ] = 0;
						}

						$translatable_element = $this->translatable_element_provider->get_from_type( $element_type, $element_id );
						$words_per_langs[ $to_lang ] += $translatable_element->get_words_count();
					}
				}
			}
		}

		return $words_per_langs;
	}
}