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<?php

namespace VSP\Helper;

defined( 'ABSPATH' ) || exit;

/**
 * Class Price_Calculation
 *
 * @package VSP\Helper
 * @author Varun Sridharan <varunsridharan23@gmail.com>
 * @since 0.8.5
 */
class Price_Calculation {
    /**
     * Returns All Possible Price Types
     *
     * @static
     * @return mixed|void
     * @since 0.8.9.7
     */
    public static function types() {
        return apply_filters( 'vsp/price_calculation/types', array(
            'fixed'      => esc_html__( 'Fixed', 'vsp-framework' ),
            'percentage' => esc_html__( 'Percentage (%)', 'vsp-framework' ),
        ) );
    }

    /**
     * Returns All Possible Price Operators
     *
     * @static
     * @return mixed|void
     * @since 0.8.9.7
     */
    public static function operators() {
        return apply_filters( 'vsp/price_calculation/operators', array(
            'add' => esc_html__( 'Add (+)', 'vsp-framework' ),
            'sub' => esc_html__( 'Subtract (-)', 'vsp-framework' ),
        ) );
    }

    /**
     * Validates if given value is addition key.
     *
     * @param $type
     *
     * @static
     * @return bool
     * @since 0.8.9.7
     */
    public static function is_operator_add( $type ) {
        return ( in_array( strtolower( $type ), array( 'add', '+' ), true ) );
    }

    /**
     * Validates if given value is subraction key.
     *
     * @param $type
     *
     * @static
     * @return bool
     * @since 0.8.9.7
     */
    public static function is_operator_sub( $type ) {
        return ( in_array( strtolower( $type ), array( 'sub', '-' ), true ) );
    }

    /**
     * Handles Price Calculation.
     *
     * @param string|int $existing_price
     * @param string|int $new_price
     * @param string     $operator
     *
     * @return bool
     */
    public static function fixed( $existing_price, $new_price, $operator ) {
        if ( self::is_operator_add( $operator ) ) {
            return $existing_price + $new_price;
        } elseif ( self::is_operator_sub( $operator ) ) {
            return $existing_price - $new_price;
        }
        return false;
    }

    /**
     * Handles Percentage Calculation.
     *
     * @param string|int $existing_price
     * @param string|int $new_price
     * @param string     $operator
     *
     * @return bool
     */
    public static function percentage( $existing_price, $new_price, $operator ) {
        $price = $new_price;
        if ( self::is_operator_add( $operator ) ) {
            $price = $existing_price + ( $existing_price * ( $new_price / 100 ) );
        } elseif ( self::is_operator_sub( $operator ) ) {
            $price = $existing_price - ( $existing_price * ( $new_price / 100 ) );
        }
        return (float) $price;
    }

    /**
     * Handles Price Calcultion Concept.
     *
     * @param string|int  $existing_price
     * @param string|int  $new_price
     * @param string      $operator
     * @param string      $rule
     * @param bool|string $force_update
     *
     * @return string
     */
    public static function get( $existing_price, $new_price, $operator, $rule, $force_update ) {
        if ( empty( $existing_price ) ) {
            if ( ! empty( $force_update ) && in_array( $force_update, array( true, 'yes', 'on', 1, '1' ), true ) ) {
                return $new_price;
            }
            return $existing_price;
        }

        $price = $new_price;
        switch ( $rule ) {
            case 'fixed':
                $price = static::fixed( $existing_price, $new_price, $operator );
                break;
            case 'percentage':
                $price = static::percentage( $existing_price, $new_price, $operator );
                break;
            default:
                $types = array_keys( self::types() );
                if ( in_array( $rule, $types, true ) ) {
                    $price = apply_filters( 'vsp/price_calculation/' . $rule, $existing_price, $new_price, $operator );
                }
                break;
        }
        return wc_format_decimal( $price );
    }
}