<?php

namespace App\Services\Finance;

class FinancialPdfReportService
{
    public function __construct(private FinancialChartService $charts) {}

    public function buildPdf(array $summary): string
    {
        $this->loadFpdf();

        $pdf = new \FPDF;
        $pdf->AddPage();
        $pdf->SetFont('Arial', 'B', 16);
        $pdf->Cell(0, 10, 'Financial Report for School Year: '.($summary['schoolYear'] ?? ''), 0, 1, 'C');

        $pdf->Ln(10);
        $pdf->SetFont('Arial', 'B', 12);
        $pdf->Cell(130, 10, 'Description', 1);
        $pdf->Cell(60, 10, 'Amount (USD)', 1);
        $pdf->Ln();

        $rows = [
            'Total Charges' => $summary['totalCharges'] ?? 0,
            'Total Extra Charges' => $summary['totalExtraCharges'] ?? 0,
            'Total Discounts' => $summary['totalDiscounts'] ?? 0,
            'Total Refunds' => $summary['totalRefunds'] ?? 0,
            'Total Expenses' => $summary['totalExpenses'] ?? 0,
            'Total Reimbursements' => $summary['totalReimbursements'] ?? 0,
            'Donation to School (Masjid/Donation reimbursements)' => $summary['donationToSchool'] ?? 0,
            'Net Amount (Earned Income)' => $summary['netAmount'] ?? 0,
            'Amount Collected (Paid)' => $summary['amountCollected'] ?? 0,
            'Amount Unpaid (Outstanding)' => $summary['totalUnpaid'] ?? 0,
        ];

        $pdf->SetFont('Arial', '', 11);
        foreach ($rows as $label => $amount) {
            $pdf->Cell(130, 10, $label, 1);
            $pdf->Cell(60, 10, '$'.number_format((float) $amount, 2), 1);
            $pdf->Ln();
        }

        $barChart = $this->charts->generateBarChart($summary);
        if (! empty($barChart) && file_exists($barChart)) {
            $pdf->Ln(10);
            $pdf->SetFont('Arial', 'B', 12);
            $pdf->Cell(0, 10, 'Summary Graph', 0, 1);
            $pdf->Image($barChart, null, null, 180);
        }

        $pieChart = $this->charts->generatePieChart($summary);
        if (! empty($pieChart) && file_exists($pieChart)) {
            $pdf->Ln(10);
            $pdf->SetFont('Arial', 'B', 12);
            $pdf->Cell(0, 10, 'Expense Breakdown', 0, 1);
            $pdf->Image($pieChart, null, null, 120);
        }

        return $pdf->Output('S');
    }

    private function loadFpdf(): void
    {
        if (class_exists('FPDF', false)) {
            return;
        }

        require_once base_path('app/ThirdParty/fpdf/fpdf.php');
    }
}