<?php

namespace App\Http\Controllers\Api;

use App\Models\Configuration;
use App\Models\PaymentTransaction;
use Symfony\Component\HttpFoundation\Response;

class PaymentTransactionController extends BaseApiController
{
    protected PaymentTransaction $transaction;
    protected Configuration $config;

    public function __construct()
    {
        parent::__construct();
        $this->transaction = model(PaymentTransaction::class);
        $this->config      = model(Configuration::class);
    }

    public function index()
    {
        $page      = max(1, (int) ($this->request->getGet('page') ?? 1));
        $perPage   = min(100, max(1, (int) ($this->request->getGet('per_page') ?? 20)));
        $paymentId = $this->request->getGet('payment_id');
        $status    = $this->request->getGet('status');

        $query = $this->transaction->newQuery();

        if ($paymentId) {
            $query->where('payment_id', $paymentId);
        }

        if ($status) {
            $query->where('payment_status', $status);
        }

        $result = $this->paginate($query, $page, $perPage);

        return $this->success($result, 'Payment transactions retrieved successfully');
    }

    public function show($id = null)
    {
        $transaction = $this->transaction->find($id);
        if (!$transaction) {
            return $this->error('Payment transaction not found', Response::HTTP_NOT_FOUND);
        }

        return $this->success($transaction, 'Payment transaction retrieved successfully');
    }

    /**
     * GET /api/v1/payment-transactions/payment/{paymentId}
     * Get all transactions for a specific payment
     */
    public function getByPayment($paymentId = null)
    {
        if (!$paymentId) {
            return $this->error('Payment ID is required', Response::HTTP_BAD_REQUEST);
        }

        try {
            $transactions = $this->transaction->getTransactionsByPaymentId($paymentId);
            
            if (empty($transactions)) {
                return $this->error('Transactions not found for the payment', Response::HTTP_NOT_FOUND);
            }

            return $this->success($transactions, 'Payment transactions retrieved successfully');
        } catch (\Throwable $e) {
            log_message('error', 'Get transactions by payment error: ' . $e->getMessage());
            return $this->respondError('Failed to retrieve payment transactions', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }

    /**
     * POST /api/v1/payment-transactions
     * Create a new payment transaction (installment)
     */
    public function store()
    {
        $data = $this->payloadData();
        if (empty($data)) {
            return $this->error('Invalid request data', Response::HTTP_BAD_REQUEST);
        }

        $rules = [
            'payment_id'        => 'required|integer',
            'transaction_id'    => 'required|unique:payment_transactions,transaction_id',
            'amount'            => 'required|numeric|min:0',
            'payment_method'    => 'required|string|max:50',
            'transaction_date'  => 'permit_empty|valid_date[Y-m-d H:i:s]',
            'transaction_fee'   => 'permit_empty|numeric|min:0',
            'payment_reference' => 'permit_empty|string|max:255',
            'is_full_payment'   => 'permit_empty|in:0,1',
        ];

        $errors = $this->validateRequest($data, $rules);
        if (!empty($errors)) {
            return $this->respondValidationError($errors);
        }

        $schoolYear = $this->config->getConfig('school_year');
        $semester   = $this->config->getConfig('semester');

        $transactionData = [
            'transaction_id'    => $data['transaction_id'],
            'payment_id'        => (int) $data['payment_id'],
            'transaction_date'  => $data['transaction_date'] ?? date('Y-m-d H:i:s'),
            'amount'            => (float) $data['amount'],
            'payment_method'    => $data['payment_method'],
            'payment_status'    => 'Pending', // Default status as per CodeIgniter version
            'transaction_fee'   => isset($data['transaction_fee']) ? (float) $data['transaction_fee'] : 0,
            'payment_reference' => $data['payment_reference'] ?? null,
            'is_full_payment'   => isset($data['is_full_payment']) ? ((int) $data['is_full_payment'] ? 1 : 0) : 0,
            'school_year'       => $schoolYear,
            'semester'          => $semester,
        ];

        try {
            $transaction = $this->transaction->create($transactionData);
            return $this->respondCreated($transaction->toArray(), 'Payment transaction created successfully');
        } catch (\Throwable $e) {
            log_message('error', 'Payment transaction creation error: ' . $e->getMessage());
            return $this->respondError('Failed to create payment transaction', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }

    /**
     * PATCH /api/v1/payment-transactions/{transactionId}/status
     * Update payment status by transaction ID
     */
    public function updateStatus($transactionId = null)
    {
        if (!$transactionId) {
            return $this->error('Transaction ID is required', Response::HTTP_BAD_REQUEST);
        }

        $data = $this->payloadData();
        if (empty($data) || !isset($data['status'])) {
            return $this->error('Status is required', Response::HTTP_BAD_REQUEST);
        }

        $status = (string) $data['status'];

        $rules = [
            'status' => 'required|string|max:50',
        ];

        $errors = $this->validateRequest($data, $rules);
        if (!empty($errors)) {
            return $this->respondValidationError($errors);
        }

        try {
            // First check if transaction exists by transaction_id (string) or id (integer)
            $transaction = null;
            if (is_numeric($transactionId)) {
                $transaction = $this->transaction->find((int) $transactionId);
            }
            
            if (!$transaction) {
                $transaction = $this->transaction->getTransactionById($transactionId);
            }

            if (!$transaction) {
                return $this->error('Transaction not found', Response::HTTP_NOT_FOUND);
            }

            // Update by transaction_id if it's a string, otherwise by id
            $updated = false;
            if (is_numeric($transactionId)) {
                $updated = $this->transaction->update((int) $transactionId, ['payment_status' => $status]);
            } else {
                $updated = $this->transaction->updateTransactionStatus($transactionId, $status);
            }

            if ($updated) {
                // Fetch updated transaction
                $updatedTransaction = is_numeric($transactionId) 
                    ? $this->transaction->find((int) $transactionId)
                    : $this->transaction->getTransactionById($transactionId);

                return $this->success([
                    'status' => 'success',
                    'transaction' => $updatedTransaction,
                ], 'Transaction status updated successfully');
            } else {
                return $this->respondError('Failed to update transaction status', Response::HTTP_INTERNAL_SERVER_ERROR);
            }
        } catch (\Throwable $e) {
            log_message('error', 'Update transaction status error: ' . $e->getMessage());
            return $this->respondError('Failed to update transaction status', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }
}