<?php declare(strict_types=1);


namespace App\Discounts\Conditions;


use App\Cart\ShoppingCartInterface;
use App\Discounts\Discount;
use App\Discounts\DiscountableInterface;
use App\Discounts\DiscountService;
use Illuminate\Support\Facades\Cache;

class WeatherHandler extends AbstractDiscountConditionHandler
{
    public function canBeApplied(DiscountableInterface $discountable, string $operator, string $param): bool
    {
        $discountService = new DiscountService();

        if(!is_a($discountable, ShoppingCartInterface::class)) return false;

        $weatherParts = explode(',',$param);
        if(count($weatherParts) !== 2) return false;

        $weatherstationIndex = (int) $weatherParts[0];
        $temperature = (float) $weatherParts[1];

        $data = $discountService->weatherInfo();
        if(!$data) return false;

        if(!array_key_exists('actual', $data)) return false;
        if(!array_key_exists('stationmeasurements', $data['actual'])) return false;
        if(!is_array($data['actual']['stationmeasurements'])) return false;

        $canBeApplied = false;
        $stationMeasurements = $data['actual']['stationmeasurements'];

        if($weatherstationIndex === 0) {
            foreach ($stationMeasurements as $index => $stationMeasurement) {
                $stationTemperature = $this->extractWeatherStationData($stationMeasurement, 'temperature');
                if(!$stationTemperature) continue;
                $canBeApplied = $this->compare($stationTemperature, $operator, $temperature);

                if ($canBeApplied) break;
            }
        } else {
            if(!isset($stationMeasurements[$weatherstationIndex])) $canBeApplied = false;
            else $canBeApplied = $this->compare(
                $this->extractWeatherStationData($stationMeasurements[$weatherstationIndex], 'temperature'),
                $operator,
                $temperature);
        }

//        if($canBeApplied) dd($stationMeasurement);
        return $canBeApplied;
    }

    private function extractWeatherStationData(array $stationMeasurement, $variable) {
        if (
            !is_array($stationMeasurement) ||
            !array_key_exists($variable, $stationMeasurement)
        ) {
            return null;
        } else {
            return $stationMeasurement[$variable];
        }
    }

    private function compare($lhs, $operator, $rhs) {
        $result = false;
        if($operator === '<') {
            if($lhs < (float) $rhs) $result = true;
        } else if($operator === '<=') {
            if($lhs <= (float) $rhs) $result = true;
        } else if($operator === '==') {
            if($lhs == (float) $rhs) $result = true;
        } else if($operator === '!=') {
            if($lhs != (float) $rhs) $result = true;
        } else if($operator >= '>=') {
            if($lhs >= (float) $rhs) $result = true;
        } else if($operator > '>') {
            if($lhs > (float) $rhs) $result = true;
        }
        return $result;
    }

    private function dissectParam(string $param) {
        return array_map('trim', explode(',', $param));
    }
}