<?php

namespace App\Models;

use CodeIgniter\Database\ConnectionInterface;
use CodeIgniter\Model;
use App\Models\Concerns\SchoolYearAutoFillTrait;
use CodeIgniter\Validation\ValidationInterface;

class RefundModel extends Model
{
    use SchoolYearAutoFillTrait;

    protected $table = 'refunds';
    protected $primaryKey = 'id';

    protected $allowedFields = [
        'parent_id',
        'school_year',
        'invoice_id',
        'refund_amount',
        'requested_amount_cents',
        'approved_amount_cents',
        'reconciliation_status',
        'reconciliation_reason',
        'reconciliation_required_at',
        'currency',
        'requested_at',
        'approved_at',
        'refunded_at',
        'status',
        'reason',
        'refund_paid_amount',
        'request',
        'source_type',
        'source_id',
        'note',
        'semester',
        'school_year',
        'approved_by',
        'updated_by',
        'refund_method',
        'check_nbr',
        'check_file'
    ];
    protected $validationRules = [
        'school_year' => 'required|string|max_length[9]',
    ];


    protected $useTimestamps = true;
    protected $createdField  = 'created_at';
    protected $updatedField  = 'updated_at';

    private array $refundColumns = [];

    public function __construct(?ConnectionInterface $db = null, ?ValidationInterface $validation = null)
    {
        parent::__construct($db, $validation);

        $this->refundColumns = $this->getTableColumns($this->table);
        $this->allowedFields = array_values(array_filter(
            $this->allowedFields,
            fn (string $field): bool => in_array($field, $this->refundColumns, true)
        ));

        foreach (array_keys($this->validationRules) as $field) {
            if (!in_array($field, $this->allowedFields, true)) {
                unset($this->validationRules[$field]);
            }
        }
    }

    private function getTableColumns(string $table): array
    {
        try {
            return $this->db->getFieldNames($table);
        } catch (\Throwable $e) {
            log_message('error', '[RefundModel] Could not read table columns for {table}: {error}', [
                'table' => $table,
                'error' => $e->getMessage(),
            ]);

            return [];
        }
    }

    /**
     * Get total approved refund for a parent in a specific school year.
     *
     * @param int $parentId
     * @param string $schoolYear
     * @return float
     */
    public function getTotalApprovedRefundByParentIdAndSchoolYear(int $parentId, string $schoolYear): float
    {
        // Sum refunds that have been at least partially paid out to the parent
        $result = $this->selectSum('refund_paid_amount', 'total_paid')
            ->where('parent_id', $parentId)
            ->where('school_year', $schoolYear)
            ->whereIn('status', ['Partial', 'Paid'])
            ->get()
            ->getRowArray();

        return $result && isset($result['total_paid']) ? (float) $result['total_paid'] : 0.00;
    }
}