<?php

namespace App\Utils\Traits\Payment;

use App\Factory\CreditFactory;
use App\Factory\InvoiceItemFactory;
use App\Models\Activity;
use App\Models\Credit;
use App\Models\Invoice;
use App\Models\Payment;
use App\Repositories\ActivityRepository;

trait Refundable
{

	/**
	 * Entry point for processing of refunds
	 */
	public function processRefund(array $data)
	{

		if(isset($data['invoices']) && count($data['invoices']) > 0)
			return $this->refundPaymentWithInvoices($data);

		return $this->refundPaymentWithNoInvoices($data);
	}

	private function refundPaymentWithNoInvoices(array $data)
	{
		//adjust payment refunded column amount
		$this->refunded = $data['amount'];

		if($data['amount'] == $this->amount)
			$this->status_id = Payment::STATUS_REFUNDED;
		else
			$this->status_id = Payment::STATUS_PARTIALLY_REFUNDED; 

		$credit_note = $this->buildCreditNote($data);

			$credit_line_item = InvoiceItemFactory::create();
			$credit_line_item->quantity = 1;
			$credit_line_item->cost = $data['amount'];
			$credit_line_item->product_key = ctrans('texts.credit');
			$credit_line_item->notes = ctrans('texts.credit_created_by', ['transaction_reference' => $this->number]);
			$credit_line_item->line_total = $data['amount'];
			$credit_line_item->date = $data['date'];

			$line_items = [];
			$line_items[] = $credit_line_item;

		$credit_note->save();
		$credit_note->number = $this->client->getNextCreditNumber($this->client);
		$credit_note->save();
		
		$this->createActivity($data, $credit_note->id);

		//determine if we need to refund via gateway
		if($data['gateway_refund'] !== false)
		{
			//todo process gateway refund, on success, reduce the credit note balance to 0
		}

		$this->save();

		//$this->client->paid_to_date -= $data['amount'];
		$this->client->save();

		return $this->fresh();
	}


	private function refundPaymentWithInvoices($data)
	{

		$total_refund = 0;

		foreach($data['invoices'] as $invoice)
			$total_refund += $invoice['amount'];

		$data['amount'] = $total_refund;

		/* Set Payment Status*/
		if($total_refund == $this->amount)
			$this->status_id = Payment::STATUS_REFUNDED;
		else
			$this->status_id = Payment::STATUS_PARTIALLY_REFUNDED; 

		/* Build Credit Note*/
		$credit_note = $this->buildCreditNote($data);

		$line_items = [];

			foreach($data['invoices'] as $invoice)
			{
				$inv = Invoice::find($invoice['invoice_id']);

				$credit_line_item = InvoiceItemFactory::create();
				$credit_line_item->quantity = 1;
				$credit_line_item->cost = $invoice['amount'];
				$credit_line_item->product_key = ctrans('texts.invoice');
				$credit_line_item->notes = ctrans('texts.refund_body', ['amount' => $data['amount'], 'invoice_number' => $inv->number]);
				$credit_line_item->line_total = $invoice['amount'];
				$credit_line_item->date = $data['date'];

				$line_items[] = $credit_line_item;
			}

			/* Update paymentable record */
            foreach($this->invoices as $paymentable_invoice)
            {

            	foreach($data['invoices'] as $refunded_invoice)
            	{

            		if($refunded_invoice['invoice_id'] == $paymentable_invoice->id)
            		{
            			$paymentable_invoice->pivot->refunded += $refunded_invoice['amount'];
            			$paymentable_invoice->pivot->save();
            		}

            	}

            }

            if($this->credits()->exists())
            {
            	//Adjust credits first!!!
	            foreach($this->credits as $paymentable_credit)
	            {
	            	$available_credit = $paymentable_credit->pivot->amount - $paymentable_credit->pivot->refunded;

	            	if($available_credit > $total_refund){
	            		$paymentable_credit->pivot->refunded += $total_refund;
	            		$paymentable_credit->pivot->save();

	            		$paymentable_credit->balance += $total_refund;
	            		$paymentable_credit->save();

	            		$total_refund = 0;

	            	}
	            	else {
	            		$paymentable_credit->pivot->refunded += $available_credit;
	            		$paymentable_credit->pivot->save();

	            		$paymentable_credit->balance += $available_credit;
	            		$paymentable_credit->save();

	            		$total_refund -= $available_credit;
	            	}

	            	if($total_refund == 0)
	            		break;
	            }

            }

		$credit_note->line_items = $line_items;
		$credit_note->save();

		$credit_note->number = $this->client->getNextCreditNumber($this->client);
		$credit_note->save();

		//determine if we need to refund via gateway
		if($data['gateway_refund'] !== false)
		{
			//todo process gateway refund, on success, reduce the credit note balance to 0
		}


		if($total_refund > 0)
			$this->refunded += $total_refund; 

		$this->save();

		$this->adjustInvoices($data);

		$this->client->paid_to_date -= $data['amount'];
		$this->client->save();


		return $this;
	}

	private function createActivity(array $data, int $credit_id)
	{

        $fields = new \stdClass;
        $activity_repo = new ActivityRepository();

        $fields->payment_id = $this->id;
        $fields->user_id = $this->user_id;
        $fields->company_id = $this->company_id;
        $fields->activity_type_id = Activity::REFUNDED_PAYMENT;
        $fields->credit_id = $credit_id;

        if(isset($data['invoices']))
        {
	        foreach ($data['invoices'] as $invoice) 
	        { 
	            $fields->invoice_id = $invoice->id;	
				
				$activity_repo->save($fields, $this);
	    
	        }
        }
        else
        	$activity_repo->save($fields, $this);
	    
	}


	private function buildCreditNote(array $data) :?Credit
	{
		$credit_note = CreditFactory::create($this->company_id, $this->user_id);
		$credit_note->assigned_user_id = isset($this->assigned_user_id) ?: null;
		$credit_note->date = $data['date'];
		$credit_note->status_id = Credit::STATUS_SENT;
		$credit_note->client_id = $this->client->id;
		$credit_note->amount = $data['amount'];
		$credit_note->balance = $data['amount'];

		return $credit_note;
	}

	private function adjustInvoices(array $data) :void
	{
        foreach($data['invoices'] as $refunded_invoice)
        {
        	$invoice = Invoice::find($refunded_invoice['invoice_id']);

        	$invoice->service()->updateBalance($refunded_invoice['amount'])->save();

        	if($invoice->amount == $invoice->balance)
        		$invoice->service()->setStatus(Invoice::STATUS_SENT);
        	else
        		$invoice->service()->setStatus(Invoice::STATUS_PARTIAL);

        	$client = $invoice->client;

        	$client->balance += $refunded_invoice['amount'];
        	///$client->paid_to_date -= $refunded_invoice['amount'];

        	$client->save();

        	//todo adjust ledger balance here? or after and reference the credit and its total

        }
	}
}