<?php

namespace App\Util;

use App\Entity\RoomFare;

//Utils - Functions to select prices and fares.
class PriceSelectionMethods
{
    #region Fare Selection

    /**
     * Fare Selection - Get fare with highest price.
     * @param RoomFare[] $fareList List of fares.
     */
    public static function selectFare_Highest(array $fareList): int
    {
        $pricesArr = array_map(function (RoomFare $f) {
            return $f->getFareAmount();
        }, $fareList);

        return max($pricesArr);
    }

    /**
     * Fare Selection - Get fare with lowest price.
     * @param RoomFare[] $fareList List of fares.
     */
    public static function selectFare_Lowest(array $fareList): int
    {
        $pricesArr = array_map(function (RoomFare $f) {
            return $f->getFareAmount();
        }, $fareList);

        return min($pricesArr);
    }

    /**
     * Fare Selection - Get average price of given fares.
     * @param RoomFare[] $fareList List of fares.
     */
    public static function selectFare_Average(array $fareList): int|null
    {
        $totalAmount = 0;
        $count = 0;
        foreach ($fareList as $fare) {
            $fareAmount = $fare->getFareAmount();
            if ($fareAmount != null) {
                $totalAmount += $fareAmount;
                $count++;
            }
        }

        return $count > 0 ? ($totalAmount / $count) : null;
    }

    #endregion

    #region Price Selection

    /**
     * Price Method - Total price is the sum of daily prices.
     * @param array $prices
     * @return int Total price.
     */
    public static function priceMethod_Sum(array $prices): int
    {
        $values = array_values($prices);
        return array_sum($values);
    }

    /**
     * Price Method - Apply the hightest daily price to all days.
     * @param array $prices
     * @return int Total price.
     */
    public static function priceMethod_Highest(array $prices): int
    {
        $highestPrice = max($prices);
        $numDays = count($prices);

        return $numDays * $highestPrice;
    }

    /**
     * Price Method - Apply the lowest daily price to all days.
     * @param array $prices
     * @return int Total price.
     */
    public static function priceMethod_Lowest(array $prices): int
    {
        $highestPrice = min($prices);
        $numDays = count($prices);

        return $numDays * $highestPrice;
    }

    /**
     * Price Method - Calculate average daily price and apply it to all days.
     * @param array $prices
     * @return int Total price.
     */
    public static function priceMethod_Average(array $prices): int|null
    {
        $sum = array_sum($prices);
        $numDays = count($prices);
        $averagePrice = $numDays > 0 ? $sum / $numDays : null;

        return $averagePrice != null ? $averagePrice * $numDays : null;
    }


    #endregion
}