<?php

declare(strict_types=1);

$inputPath = $argv[1] ?? '.davidson-reports/lighthouse-report.json';
$outputPath = $argv[2] ?? '.davidson-reports/davidson-lighthouse.json';

if (!file_exists($inputPath)) {
    fwrite(STDERR, "ERROR: Lighthouse report not found: $inputPath\n");
    exit(1);
}

$json = file_get_contents($inputPath);

if ($json === false) {
    fwrite(STDERR, "ERROR: Could not read Lighthouse report.\n");
    exit(1);
}

$data = json_decode($json, true);

if (!is_array($data)) {
    fwrite(STDERR, "ERROR: Invalid Lighthouse JSON.\n");
    exit(1);
}

function getScoreStatus(int $score): array
{
    if ($score >= 90) {
        return [
            'status' => 'Good',
            'class' => 'good',
        ];
    }

    if ($score >= 50) {
        return [
            'status' => 'Fix',
            'class' => 'fix',
        ];
    }

    return [
        'status' => 'Issue',
        'class' => 'issue',
    ];
}

$categoryIds = [
    'performance',
    'accessibility',
    'best-practices',
    'seo',
];

$scores = [];

$auditCategories = [];

foreach ($categoryIds as $categoryId) {
    $auditRefs = $data['categories'][$categoryId]['auditRefs'] ?? [];

    foreach ($auditRefs as $auditRef) {
        $auditId = $auditRef['id'] ?? null;

        if ($auditId === null) {
            continue;
        }

        $auditCategories[$auditId][] = $categoryId;
    }
}

foreach ($categoryIds as $categoryId) {
    $rawScore = $data['categories'][$categoryId]['score'] ?? null;

    if (!is_numeric($rawScore)) {
        continue;
    }

    $score = (int) round($rawScore * 100);
    $status = getScoreStatus($score);

    $scores[$categoryId] = [
        'score' => $score,
        'status' => $status['status'],
        'class' => $status['class'],
    ];
}

$findings = [];

$skipModes = [
    'notApplicable',
    'informative',
    'manual',
    'error',
    'numeric',
];

foreach ($data['audits'] ?? [] as $auditId => $audit) {
    $score = $audit['score'] ?? null;
    $scoreDisplayMode = $audit['scoreDisplayMode'] ?? null;

    if ($score === null) {
        continue;
    }

    if (in_array($scoreDisplayMode, $skipModes, true)) {
        continue;
    }

    if (!is_numeric($score) || $score >= 1) {
        continue;
    }

    $categories = $auditCategories[$auditId] ?? [];

    if ($categories === []) {
        continue;
    }

    $findings[] = [
        'id' => $auditId,
        'categories' => $categories,
        'title' => $audit['title'] ?? $auditId,
        'problem' => $audit['description'] ?? '',
        'impact' => $audit['displayValue'] ?? null,
        'score' => (int) round($score * 100),
    ];
}

$output = [
    'schemaVersion' => 1,
    'scores' => $scores,
    'findings' => $findings,
];

$outputJson = json_encode(
    $output,
    JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES
);

if ($outputJson === false) {
    fwrite(STDERR, "ERROR: Could not encode Davidson Lighthouse report.\n");
    exit(1);
}

$outputDir = dirname($outputPath);

if (!is_dir($outputDir)) {
    mkdir($outputDir, 0777, true);
}

if (file_put_contents($outputPath, $outputJson) === false) {
    fwrite(STDERR, "ERROR: Could not write Davidson Lighthouse report.\n");
    exit(1);
}

echo "Davidson Lighthouse report generated.\n";
echo "Saved: $outputPath\n";