<?php
/**
 * Display helpers.
 *
 * @package Dealroot
 */

namespace Dealroot\Admin;

use Dealroot\Settings;

defined( 'ABSPATH' ) || exit;

/**
 * Number and money formatting in the user's locale.
 */
class Format {

	/**
	 * Amount per item, e.g. cost per lead. Only for amounts in a single currency.
	 *
	 * @param array $amounts Currency => amount.
	 * @param int   $count   Number of items.
	 * @return string
	 */
	public static function per( array $amounts, $count ) {
		$amounts = array_filter( $amounts );

		if ( 1 !== count( $amounts ) || $count < 1 ) {
			return '—';
		}

		return self::money( reset( $amounts ) / $count, (string) key( $amounts ) );
	}

	/**
	 * Return on ad spend: revenue divided by cost, e.g. "3.2×". Needs both in the same currency.
	 *
	 * @param array $revenue Currency => amount.
	 * @param array $cost    Currency => amount.
	 * @return string
	 */
	public static function roas( array $revenue, array $cost ) {
		$revenue = array_filter( $revenue );
		$cost    = array_filter( $cost );

		if ( 1 !== count( $cost ) || array_diff( array_keys( $revenue ), array_keys( $cost ) ) ) {
			return '—';
		}

		$value = ( $revenue[ key( $cost ) ] ?? 0 ) / reset( $cost );

		return number_format_i18n( $value, $value < 10 ? 1 : 0 ) . '×';
	}

	/**
	 * Share of the revenue that is profit, e.g. "32%". Needs both in one currency.
	 *
	 * @param array $profit  Currency => amount.
	 * @param array $revenue Currency => amount.
	 * @return string
	 */
	public static function margin( array $profit, array $revenue ) {
		$revenue = array_filter( $revenue );

		if ( 1 !== count( $revenue ) || array_diff( array_keys( array_filter( $profit ) ), array_keys( $revenue ) ) ) {
			return '—';
		}

		$value = ( $profit[ key( $revenue ) ] ?? 0 ) / reset( $revenue ) * 100;

		return number_format_i18n( $value, abs( $value ) < 10 ? 1 : 0 ) . '%';
	}

	/**
	 * Amount left after a cost, per currency, e.g. profit after ad spend.
	 *
	 * @param array $amounts Currency => amount.
	 * @param array $cost    Currency => amount.
	 * @return string
	 */
	public static function after( array $amounts, array $cost ) {
		$left = $amounts;

		foreach ( $cost as $currency => $amount ) {
			$left[ $currency ] = ( $left[ $currency ] ?? 0 ) - $amount;
		}

		return self::money_list( $left );
	}

	/**
	 * Formats an amount with its currency.
	 *
	 * @param float  $amount   Amount.
	 * @param string $currency ISO 4217 code.
	 * @return string
	 */
	public static function money( $amount, $currency = '' ) {
		$currency = '' !== $currency ? $currency : Settings::get( 'currency' );

		// Whole amounts, as most deals are, read better without the cents.
		$whole = abs( (float) $amount - round( (float) $amount ) ) < 0.005;

		if ( class_exists( '\NumberFormatter' ) ) {
			$formatter = new \NumberFormatter( get_user_locale(), \NumberFormatter::CURRENCY );

			if ( $whole ) {
				$formatter->setAttribute( \NumberFormatter::FRACTION_DIGITS, 0 );
			}

			$formatted = $formatter->formatCurrency( (float) $amount, $currency );

			if ( false !== $formatted ) {
				return $formatted;
			}
		}

		return number_format_i18n( (float) $amount, $whole ? 0 : 2 ) . ' ' . $currency;
	}

	/**
	 * Amounts in several currencies, e.g. "8.390,50 € + 120,00 $".
	 *
	 * @param array $amounts Currency => amount.
	 * @return string
	 */
	public static function money_list( array $amounts ) {
		$amounts = array_filter( $amounts );
		if ( ! $amounts ) {
			return '—';
		}

		$default = Settings::get( 'currency' );
		uksort(
			$amounts,
			static function ( $a, $b ) use ( $default ) {
				$order = ( $b === $default ) <=> ( $a === $default );

				return 0 !== $order ? $order : strcmp( $a, $b );
			}
		);

		$list = '';
		foreach ( $amounts as $currency => $amount ) {
			$amount = (float) $amount;

			// "120,00 $ − 40,00 €" rather than "120,00 $ + -40,00 €".
			if ( '' === $list ) {
				$list = self::money( $amount, $currency );
			} else {
				$list .= ( $amount < 0 ? ' − ' : ' + ' ) . self::money( abs( $amount ), $currency );
			}
		}

		return $list;
	}

	/**
	 * Duration such as "45 min", "3 h 20 min" or "2 days".
	 *
	 * @param int $seconds Seconds.
	 * @return string
	 */
	public static function duration( $seconds ) {
		$seconds = max( 0, (int) $seconds );

		if ( $seconds < HOUR_IN_SECONDS ) {
			/* translators: %s: number of minutes. */
			return sprintf( __( '%s min', 'dealroot' ), number_format_i18n( max( 1, (int) round( $seconds / MINUTE_IN_SECONDS ) ) ) );
		}

		if ( $seconds < DAY_IN_SECONDS ) {
			$hours   = intdiv( $seconds, HOUR_IN_SECONDS );
			$minutes = (int) round( ( $seconds % HOUR_IN_SECONDS ) / MINUTE_IN_SECONDS );

			/* translators: 1: hours, 2: minutes. */
			return $minutes ? sprintf( __( '%1$s h %2$s min', 'dealroot' ), number_format_i18n( $hours ), number_format_i18n( $minutes ) )
				/* translators: %s: number of hours. */
				: sprintf( __( '%s h', 'dealroot' ), number_format_i18n( $hours ) );
		}

		$days = (int) round( $seconds / DAY_IN_SECONDS );

		/* translators: %s: number of days. */
		return sprintf( _n( '%s day', '%s days', $days, 'dealroot' ), number_format_i18n( $days ) );
	}

	/**
	 * Percentage with one decimal.
	 *
	 * @param int $part  Part.
	 * @param int $total Total.
	 * @return string
	 */
	public static function percent( $part, $total ) {
		if ( $total < 1 ) {
			return '—';
		}

		$value = $part / $total * 100;

		return number_format_i18n( $value, abs( $value - round( $value ) ) < 0.05 ? 0 : 1 ) . '%';
	}
}