<?php

$root = dirname(__DIR__);
$patterns = [
    'refund_paid_amount',
    'SUM\\(paid_amount\\)',
    'SUM\\(amount\\)',
    'newBalance',
    'balance\\s*=',
    'total\\s*-\\s*discount',
    'total\\s*-\\s*paid',
    'Partially Paid',
    'Unpaid',
    'Paid',
];

$allowlist = [
    '/app/Libraries/InvoiceLedgerService.php',
    '/app/Libraries/ParentLedgerService.php',
    '/app/Libraries/FinancialReportProjectionService.php',
    '/app/Libraries/FinancialCorrectionReportService.php',
    '/app/Libraries/FinancialStatus.php',
    '/app/Database/Migrations/',
    '/tests/',
    '/scripts/check-financial-formulas.php',
];

$rii = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($root, FilesystemIterator::SKIP_DOTS));
$violations = [];

foreach ($rii as $file) {
    if (!$file->isFile() || $file->getExtension() !== 'php') {
        continue;
    }

    $path = str_replace($root, '', $file->getPathname());
    if (!str_starts_with($path, '/app/') && !str_starts_with($path, '/tests/')) {
        continue;
    }

    foreach ($allowlist as $allowed) {
        if (str_starts_with($path, $allowed) || $path === $allowed) {
            continue 2;
        }
    }

    $lines = file($file->getPathname(), FILE_IGNORE_NEW_LINES) ?: [];
    foreach ($lines as $lineNumber => $line) {
        foreach ($patterns as $pattern) {
            if (preg_match('/' . $pattern . '/i', $line)) {
                $violations[] = sprintf('%s:%d matches /%s/i', $path, $lineNumber + 1, $pattern);
            }
        }
    }
}

if ($violations !== []) {
    sort($violations);
}

$baselineFile = $root . '/scripts/financial-formula-baseline.txt';
if (in_array('--update-baseline', $argv, true)) {
    file_put_contents($baselineFile, implode("\n", $violations) . ($violations === [] ? '' : "\n"));
    echo 'Updated financial formula baseline with ' . count($violations) . " entries.\n";
    exit(0);
}

$baseline = [];
if (is_file($baselineFile)) {
    $baseline = array_values(array_filter(file($baselineFile, FILE_IGNORE_NEW_LINES) ?: [], static fn ($line) => trim($line) !== ''));
    sort($baseline);
}

$newViolations = array_values(array_diff($violations, $baseline));
if ($newViolations !== []) {
    fwrite(STDERR, "New financial formula patterns found outside allowlist:\n");
    fwrite(STDERR, implode("\n", $newViolations) . "\n");
    fwrite(STDERR, "Run `php scripts/check-financial-formulas.php --update-baseline` only after reviewing intentional legacy exceptions.\n");
    exit(1);
}

echo 'No new financial formula patterns found outside baseline. Current baseline entries: ' . count($baseline) . ".\n";