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class Translations {
	/**
	 * List of translation entries.
	 *
	 * @since 2.8.0
	 *
	 * @var Translation_Entry[]
	 */
	public $entries = array();

	/**
	 * List of translation headers.
	 *
	 * @since 2.8.0
	 *
	 * @var array<string, string>
	 */
	public $headers = array();

	/**
	 * Adds an entry to the PO structure.
	 *
	 * @since 2.8.0
	 *
	 * @param array|Translation_Entry $entry
	 * @return bool True on success, false if the entry doesn't have a key.
	 */
	public function add_entry( $entry ) {
		if ( is_array( $entry ) ) {
			$entry = new Translation_Entry( $entry );
		}
		$key = $entry->key();
		if ( false === $key ) {
			return false;
		}
		$this->entries[ $key ] = &$entry;
		return true;
	}

	/**
	 * Adds or merges an entry to the PO structure.
	 *
	 * @since 2.8.0
	 *
	 * @param array|Translation_Entry $entry
	 * @return bool True on success, false if the entry doesn't have a key.
	 */
	public function add_entry_or_merge( $entry ) {
		if ( is_array( $entry ) ) {
			$entry = new Translation_Entry( $entry );
		}
		$key = $entry->key();
		if ( false === $key ) {
			return false;
		}
		if ( isset( $this->entries[ $key ] ) ) {
			$this->entries[ $key ]->merge_with( $entry );
		} else {
			$this->entries[ $key ] = &$entry;
		}
		return true;
	}

	/**
	 * Sets $header PO header to $value
	 *
	 * If the header already exists, it will be overwritten
	 *
	 * TODO: this should be out of this class, it is gettext specific
	 *
	 * @since 2.8.0
	 *
	 * @param string $header header name, without trailing :
	 * @param string $value header value, without trailing n
	 */
	public function set_header( $header, $value ) {
		$this->headers[ $header ] = $value;
	}

	/**
	 * Sets translation headers.
	 *
	 * @since 2.8.0
	 *
	 * @param array $headers Associative array of headers.
	 */
	public function set_headers( $headers ) {
		foreach ( $headers as $header => $value ) {
			$this->set_header( $header, $value );
		}
	}

	/**
	 * Returns a given translation header.
	 *
	 * @since 2.8.0
	 *
	 * @param string $header
	 * @return string|false Header if it exists, false otherwise.
	 */
	public function get_header( $header ) {
		return isset( $this->headers[ $header ] ) ? $this->headers[ $header ] : false;
	}

	/**
	 * Returns a given translation entry.
	 *
	 * @since 2.8.0
	 *
	 * @param Translation_Entry $entry Translation entry.
	 * @return Translation_Entry|false Translation entry if it exists, false otherwise.
	 */
	public function translate_entry( &$entry ) {
		$key = $entry->key();
		return isset( $this->entries[ $key ] ) ? $this->entries[ $key ] : false;
	}

	/**
	 * Translates a singular string.
	 *
	 * @since 2.8.0
	 *
	 * @param string $singular
	 * @param string $context
	 * @return string
	 */
	public function translate( $singular, $context = null ) {
		$entry      = new Translation_Entry(
			array(
				'singular' => $singular,
				'context'  => $context,
			)
		);
		$translated = $this->translate_entry( $entry );
		return ( $translated && ! empty( $translated->translations ) ) ? $translated->translations[0] : $singular;
	}

	/**
	 * Given the number of items, returns the 0-based index of the plural form to use
	 *
	 * Here, in the base Translations class, the common logic for English is implemented:
	 *  0 if there is one element, 1 otherwise
	 *
	 * This function should be overridden by the subclasses. For example MO/PO can derive the logic
	 * from their headers.
	 *
	 * @since 2.8.0
	 *
	 * @param int $count Number of items.
	 * @return int Plural form to use.
	 */
	public function select_plural_form( $count ) {
		return 1 === (int) $count ? 0 : 1;
	}

	/**
	 * Returns the plural forms count.
	 *
	 * @since 2.8.0
	 *
	 * @return int Plural forms count.
	 */
	public function get_plural_forms_count() {
		return 2;
	}

	/**
	 * Translates a plural string.
	 *
	 * @since 2.8.0
	 *
	 * @param string $singular
	 * @param string $plural
	 * @param int    $count
	 * @param string $context
	 * @return string
	 */
	public function translate_plural( $singular, $plural, $count, $context = null ) {
		$entry              = new Translation_Entry(
			array(
				'singular' => $singular,
				'plural'   => $plural,
				'context'  => $context,
			)
		);
		$translated         = $this->translate_entry( $entry );
		$index              = $this->select_plural_form( $count );
		$total_plural_forms = $this->get_plural_forms_count();
		if ( $translated && 0 <= $index && $index < $total_plural_forms &&
			is_array( $translated->translations ) &&
			isset( $translated->translations[ $index ] ) ) {
			return $translated->translations[ $index ];
		} else {
			return 1 === (int) $count ? $singular : $plural;
		}
	}

	/**
	 * Merges other translations into the current one.
	 *
	 * @since 2.8.0
	 *
	 * @param Translations $other Another Translation object, whose translations will be merged in this one (passed by reference).
	 */
	public function merge_with( &$other ) {
		foreach ( $other->entries as $entry ) {
			$this->entries[ $entry->key() ] = $entry;
		}
	}

	/**
	 * Merges originals with existing entries.
	 *
	 * @since 2.8.0
	 *
	 * @param Translations $other
	 */
	public function merge_originals_with( &$other ) {
		foreach ( $other->entries as $entry ) {
			if ( ! isset( $this->entries[ $entry->key() ] ) ) {
				$this->entries[ $entry->key() ] = $entry;
			} else {
				$this->entries[ $entry->key() ]->merge_with( $entry );
			}
		}
	}
}

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