<?php

declare(strict_types=1);

$root = dirname(__DIR__);
$catalogDir = $root . '/catalog';
$exportsDir = $root . '/exports';

$products = [];
$errors = [];

if (!is_dir($catalogDir)) {
    fwrite(STDERR, "Catalog directory not found: {$catalogDir}\n");
    exit(1);
}

if (!is_dir($exportsDir) && !mkdir($exportsDir, 0775, true) && !is_dir($exportsDir)) {
    fwrite(STDERR, "Unable to create exports directory: {$exportsDir}\n");
    exit(1);
}

$iterator = new RecursiveIteratorIterator(
    new RecursiveDirectoryIterator(
        $catalogDir,
        FilesystemIterator::SKIP_DOTS
    )
);

foreach ($iterator as $file) {
    if (!$file->isFile() || strtolower($file->getExtension()) !== 'json') {
        continue;
    }

    $path = $file->getPathname();
    $relativePath = substr($path, strlen($root) + 1);

    $raw = file_get_contents($path);

    if ($raw === false) {
        $errors[] = "{$relativePath}: unable to read file";
        continue;
    }

    try {
        $record = json_decode($raw, true, 512, JSON_THROW_ON_ERROR);
    } catch (JsonException $exception) {
        $errors[] = "{$relativePath}: invalid JSON: {$exception->getMessage()}";
        continue;
    }

    if (!is_array($record)) {
        $errors[] = "{$relativePath}: root value must be an object";
        continue;
    }

    $record['_catalog_path'] = $relativePath;
    $products[] = $record;
}

if ($errors !== []) {
    fwrite(STDERR, "Export build failed:\n\n");

    foreach ($errors as $error) {
        fwrite(STDERR, " - {$error}\n");
    }

    exit(1);
}

usort(
    $products,
    static function (array $left, array $right): int {
        $leftManufacturer = strtolower((string) ($left['manufacturer'] ?? ''));
        $rightManufacturer = strtolower((string) ($right['manufacturer'] ?? ''));

        $manufacturerCompare = $leftManufacturer <=> $rightManufacturer;

        if ($manufacturerCompare !== 0) {
            return $manufacturerCompare;
        }

        $leftName = strtolower((string) ($left['product_name'] ?? ''));
        $rightName = strtolower((string) ($right['product_name'] ?? ''));

        return $leftName <=> $rightName;
    }
);

$export = [
    'format' => 'roundcount-catalog',
    'catalog_version' => 1,
    'generated_at' => gmdate('c'),
    'product_count' => count($products),
    'products' => $products,
];

try {
    $json = json_encode(
        $export,
        JSON_PRETTY_PRINT |
        JSON_UNESCAPED_SLASHES |
        JSON_THROW_ON_ERROR
    ) . PHP_EOL;
} catch (JsonException $exception) {
    fwrite(STDERR, "Unable to encode catalog export: {$exception->getMessage()}\n");
    exit(1);
}

$jsonPath = $exportsDir . '/catalog-latest.json';
$gzipPath = $exportsDir . '/catalog-latest.json.gz';

if (file_put_contents($jsonPath, $json) === false) {
    fwrite(STDERR, "Unable to write {$jsonPath}\n");
    exit(1);
}

$compressed = gzencode($json, 9);

if ($compressed === false) {
    fwrite(STDERR, "Unable to compress catalog export\n");
    exit(1);
}

if (file_put_contents($gzipPath, $compressed) === false) {
    fwrite(STDERR, "Unable to write {$gzipPath}\n");
    exit(1);
}

echo "Catalog export complete.\n";
echo "Products exported: " . count($products) . "\n";
echo "JSON: exports/catalog-latest.json\n";
echo "Gzip: exports/catalog-latest.json.gz\n";