<?php
/**
 * Payment Form: Functions
 *
 * @package SimplePay\Core\Payment_Form
 * @copyright Copyright (c) 2021, Sandhills Development, LLC
 * @license http://opensource.org/licenses/gpl-2.0.php GNU Public License
 * @since 4.1.0
 */

use SimplePay\Core\PaymentForm\PriceOptions;

/**
 * Returns a list of prices associated with a Payment Form's Payment Mode.
 *
 * @since 4.1.0
 *
 * @param \SimplePay\Core\Abstracts\Form $form Payment Form.
 * @return \SimplePay\Core\PaymentForm\PriceOption[]
 */
function simpay_get_payment_form_prices( $form ) {
	if ( false === $form ) {
		return array();
	}

	$price_options = ( new PriceOptions( $form ) )->get_prices();

	/**
	 * Filters the price options for a specific Payment Form.
	 *
	 * @since 4.1.1
	 *
	 * @param \SimplePay\Core\PaymentForm\PriceOption[] $price_options Price option.
	 * @param \SimplePay\Core\Abstracts\Form            $form Payment Form.
	 */
	$price_options = apply_filters(
		'simpay_get_payment_form_price_options',
		$price_options,
		$form
	);

	return $price_options;
}

/**
 * Retrieves a specific price option.
 *
 * @since 4.1.0
 *
 * @param \SimplePay\Core\Abstracts\Form $form Payment Form.
 * @param string                         $id Price option ID.
 * @return false|\SimplePay\Core\PaymentForm\PriceOption Price option. False if
 *                                                       not found.
 */
function simpay_payment_form_prices_get_price_by_id( $form, $price_id ) {
	$prices = simpay_get_payment_form_prices( $form );
	$prices = array_filter(
		$prices,
		function( $price ) use ( $price_id ) {
			return $price->id === $price_id;
		}
	);

	if ( empty( $prices ) ) {
		return false;
	}

	return current( $prices );
}

/**
 * Determines if the stored price has been defined in Stripe.
 *
 * @since 4.1.0
 *
 * @param string $price_id Price option ID.
 * @return bool
 */
function simpay_payment_form_prices_is_defined_price( $price_id ) {
	if ( null === $price_id ) {
		return false;
	}

	return strpos( $price_id, 'simpay_' ) !== 0;
}

/**
 * Determines if a list of Prices includes a recurring Price.
 *
 * @since 4.1.0
 *
 * @param array \SimplePay\Core\PaymentForm\PriceOption[] Price options.
 * @return bool
 */
function simpay_payment_form_prices_has_subscription_price( $prices ) {
	$has_subscription = false;

	foreach ( $prices as $price ) {
		if ( null !== $price->recurring ) {
			$has_subscription = true;
			break;
		}
	}

	return $has_subscription;
}

/**
 * Retrieves the first recurring price option.
 *
 * This is only used to fill legacy Payment Form properties and should not be
 * extended.
 *
 * @since 4.1.0
 * @access private
 *
 * @param \SimplePay\Core\PaymentForm\PriceOption[] $prices Price options.
 * @return \SimplePay\Core\PaymentForm\PriceOption[]|array
 */
function __unstable_simpay_get_payment_form_prices_subscription_price( $prices ) {
	$has_subscription = simpay_payment_form_prices_has_subscription_price( $prices );

	if ( false === $has_subscription ) {
		return array();
	}

	foreach ( $prices as $price ) {
		if ( null !== $price->recurring ) {
			return $price;
			break;
		}
	}

	return array();
}

/**
 * Returns the default price option for a Payment FOrm.
 *
 * @since 4.1.0
 *
 * @param \SimplePay\Core\PaymentForm\PriceOption[] $prices Prices list.
 * @return \SimplePay\Core\PaymentForm\PriceOption[]|false Price or false if no
 *                                                         prices are found.
 */
function simpay_get_payment_form_default_price( $prices ) {
	$price = current(
		array_filter(
			$prices,
			function( $price ) {
				return null !== $price->default && $price->default === true;
			}
		)
	);

	// Fallback to the first price.
	if ( false === $price ) {
		$price = current( $prices );
	}

	return $price;
}

/**
 * Determines if a list of prices includes the ability to set a custom amount.
 *
 * @since 4.1.0
 *
 * @param \SimplePay\Core\PaymentForm\PriceOption[] $prices Price options.
 * @return bool
 */
function simpay_payment_form_prices_has_custom_price( $prices ) {
	$prices = array_filter(
		$prices,
		function( $price ) {
			return false === $price->is_defined_amount();
		}
	);

	return ! empty( $prices );
}

/**
 * Retrieves the first custom price option.
 *
 * This is only used to fill legacy Payment Form properties and should not be
 * extended.
 *
 * @since 4.1.0
 *
 * @param \SimplePay\Core\PaymentForm\PriceOption[] $prices Price options.
 * @return \SimplePay\Core\PaymentForm\PriceOption[]|false Price option or false if no custom
 *                                                         amounts are allowed.
 */
function __unstable_simpay_get_payment_form_custom_price( $prices ) {
	$has_custom_price = simpay_payment_form_prices_has_custom_price( $prices );

	if ( false === $has_custom_price ) {
		return false;
	}

	$prices = array_filter(
		$prices,
		function( $price ) {
			return false === $price->is_defined_amount();
		}
	);

	if ( empty( $prices ) ) {
		return false;
	}

	return current( $prices );
}

/**
 * Determines if a list of prices includes the ability to optionally recur.
 *
 * @since 4.1.0
 *
 * @param \SimplePay\Core\PaymentForm\PriceOption[] $prices Price options.
 * @return bool
 */
function simpay_payment_form_prices_has_recurring_price( $prices ) {
	$prices = array_filter(
		$prices,
		function( $price ) {
			return true === $price->can_recur;
		}
	);

	return ! empty( $prices );
}

/**
 * Ensures Payment Forms have required fields and remove unnecessary fields.
 *
 * @since 4.1.0
 *
 * @param array  $fields Payment Form custom fields.
 * @param int    $form_id Payment Form ID.
 * @param string $form_display_type Payment Form display type.
 * @return array
 */
function simpay_payment_form_add_missing_custom_fields(
	$fields,
	$form_id,
	$form_display_type = 'embedded'
) {
	$form = simpay_get_form( $form_id );

	if ( false === $form ) {
		return $fields;
	}

	$prices = simpay_get_payment_form_prices( $form );
	$count  = count( $fields );

	// Form display type-specific.
	switch ( $form_display_type ) {
		case 'embedded':
		case 'overlay':
			// Ensure "Customer Email" exists.
			if ( ! isset( $fields['email'] ) ) {
				$fields['email'][] = array(
					'uid'   => $count,
					'id'    => 'simpay_' . $form_id . '_email',
					'label' => 'Email Address',
				);

				$count++;
			}

			// Ensure "Payment Methods" exist.
			if ( ! isset( $fields['card'] ) ) {
				$fields['card'][] = array(
					'order' => 9998,
					'uid'   => $count,
					'id'    => 'simpay_' . $form_id . '_card',
					'label' => 'Payment Method',
				);

				$count++;
			}

			// Ensure "Checkout" button exists.
			if ( ! isset( $fields['checkout_button'] ) ) {
				$fields['checkout_button'][] = array(
					'order' => 9999,
					'uid'   => $count,
					'id'    => 'simpay_' . $form_id . '_checkout_button',
				);

				$count++;
			}

			// Ensure "Payment Button" exists.
			if ( 'overlay' === $form_display_type ) {
				if ( ! isset( $fields['payment_button'] ) ) {
					$fields['payment_button'][] = array(
						'uid' => $count,
						'id'  => 'simpay_' . $form_id . '_payment_button',
					);

					$count++;
				}
				// Remove "Payment Button".
			} else {
				unset( $fields['payment_button'] );
			}

			break;
		default:
			// Ensure "Payment Button" exists.
			if ( ! isset( $fields['payment_button'] ) ) {
				$fields['payment_button'][] = array(
					'order' => 9999,
					'uid'   => $count,
					'id'    => 'simpay_' . $form_id . '_payment_button',
				);

				$count++;
			}

			// Remove unnecessary fields.
			unset( $fields['card'] );
			unset( $fields['checkout_button'] );
	}

	// Ensure "Price Selector" is always present.
	if ( ! isset( $fields['plan_select'] ) ) {
		$fields['plan_select'][] = array(
			'uid'   => $count,
			'id'    => 'simpay_' . $form_id . '_plan_select_' . $count,
			'label' => 'Choose an amount'
		);

		$count++;
	}

	// Ensure "Custom Amount" field exists if using a custom amount, and no Subscription.
	$has_custom_amount = simpay_payment_form_prices_has_custom_price( $prices );

	if ( true === $has_custom_amount && ! isset( $fields['custom_amount'] ) ) {
		$fields['custom_amount'][] = array(
			'uid'   => $count,
			'id'    => 'simpay_' . $form_id . '_custom_amount_' . $count,
			'label' => 'Custom Amount',
		);

		$count++;
	} elseif ( false === $has_custom_amount ) {
		unset( $fields['custom_amount'] );
	}

	// Ensure "Recurring Amount Toggle" field exists if using an optional recurring price.
	$can_recur = simpay_payment_form_prices_has_recurring_price( $prices );

	if ( true === $can_recur && ! isset( $fields['recurring_amount_toggle'] ) ) {
		$fields['recurring_amount_toggle'][] = array(
			'uid'   => $count,
			'id'    => 'simpay_' . $form_id . '_recurring_amount_toggle_' . $count,
			'label' => 'Make this a recurring amount',
		);

		$count++;
	} elseif ( false === $can_recur ) {
		unset( $fields['recurring_amount_toggle'] );
	}

	// General sorting template for auto-added fields.
	$fields = array_merge(
		array_flip(
			array(
				'email',
				'plan_select',
				'custom_amount',
				'recurring_amount_toggle',
				'card',
				'checkout_button',
			)
		),
		$fields
	);

	// "Payment Button" should always be last.
	if ( isset( $fields['payment_button'] ) ) {
		$payment_button = $fields['payment_button'];
		unset( $fields['payment_button'] );

		$fields['payment_button'] = $payment_button;
	}

	// Remove empty/invalid fields after sorting.
	$fields = array_filter(
		$fields,
		function( $field ) {
			return true === is_array( $field );
		}
	);

	return $fields;
}