<?php

namespace App\Http\Controllers\Api;

use App\Models\Configuration;
use App\Models\Refund;
use Carbon\Carbon;
use Symfony\Component\HttpFoundation\Response;

class RefundController extends BaseApiController
{
    protected Refund $refund;
    protected Configuration $config;

    public function __construct()
    {
        parent::__construct();
        $this->refund = model(Refund::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)));
        $parentId = $this->request->getGet('parent_id');
        $status   = $this->request->getGet('status');

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

        if ($parentId) {
            $query->where('parent_id', $parentId);
        }

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

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

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

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

        return $this->success($refund, 'Refund retrieved successfully');
    }

    public function store()
    {
        $user = $this->getCurrentUser();
        if (!$user) {
            return $this->respondError('Authentication required', Response::HTTP_UNAUTHORIZED);
        }

        $data = $this->payloadData();
        if (empty($data)) {
            return $this->error('Invalid request data', Response::HTTP_BAD_REQUEST);
        }

        $rules = [
            'parent_id'     => 'required|integer',
            'invoice_id'    => 'required|integer',
            'refund_amount' => 'required|numeric',
            'reason'        => 'required',
        ];

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

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

        $refundData = [
            'parent_id'        => $data['parent_id'],
            'invoice_id'       => $data['invoice_id'],
            'refund_amount'    => $data['refund_amount'],
            'reason'           => $data['reason'],
            'request'          => $data['request'] ?? null,
            'status'           => 'pending',
            'requested_at'     => Carbon::now('UTC')->toDateTimeString(),
            'school_year'      => $schoolYear,
            'semester'         => $semester,
        ];

        try {
            $refund = $this->refund->create($refundData);
            return $this->success($refund->toArray(), 'Refund request created successfully', Response::HTTP_CREATED);
        } catch (\Throwable $e) {
            log_message('error', 'Refund creation error: ' . $e->getMessage());
            return $this->respondError('Failed to create refund request', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }

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

        $user = $this->getCurrentUser();
        if (!$user) {
            return $this->respondError('Authentication required', Response::HTTP_UNAUTHORIZED);
        }

        $data = $this->payloadData();
        if (empty($data)) {
            return $this->error('Invalid request data', Response::HTTP_BAD_REQUEST);
        }

        $allowedFields = ['status', 'refund_paid_amount', 'refund_method', 'check_nbr', 'note'];
        $updateData = [];
        foreach ($allowedFields as $field) {
            if (array_key_exists($field, $data)) {
                $updateData[$field] = $data[$field];
            }
        }

        if (isset($updateData['status']) && $updateData['status'] === 'approved') {
            $updateData['approved_at'] = Carbon::now('UTC')->toDateTimeString();
            $updateData['approved_by'] = $user->id;
        }

        if (isset($updateData['status']) && $updateData['status'] === 'refunded') {
            $updateData['refunded_at'] = Carbon::now('UTC')->toDateTimeString();
        }

        if (empty($updateData)) {
            return $this->error('No valid fields to update', Response::HTTP_BAD_REQUEST);
        }

        $updateData['updated_by'] = $user->id;

        try {
            $this->refund->update($id, $updateData);
            $updatedRefund = $this->refund->find($id);
            return $this->success($updatedRefund, 'Refund updated successfully');
        } catch (\Throwable $e) {
            log_message('error', 'Refund update error: ' . $e->getMessage());
            return $this->respondError('Failed to update refund', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }
}