<?php
declare(strict_types=1);

/*
  MyAnythingList GoDaddy Domain Steward
  Private VPS PHP backend.
  Read-only inventory/export tool.
  No destructive GoDaddy API operations are implemented.
*/

function ds_root(): string {
    return dirname(__DIR__);
}

function ds_read_json(string $path, array $fallback = []): array {
    if (!is_file($path)) return $fallback;
    $raw = file_get_contents($path);
    if ($raw === false) return $fallback;
    $data = json_decode($raw, true);
    return is_array($data) ? $data : $fallback;
}

function ds_settings(): array {
    $s = ds_read_json(ds_root() . '/config/settings.json', []);
    $s['api_base_url'] = $s['api_base_url'] ?? 'https://api.godaddy.com';
    $s['market_id'] = $s['market_id'] ?? 'en-US';
    $s['shopper_id'] = $s['shopper_id'] ?? '';
    $s['default_annual_renewal_estimate_usd'] = (float)($s['default_annual_renewal_estimate_usd'] ?? 25);
    $s['estimate_window_days'] = (int)($s['estimate_window_days'] ?? 365);
    $s['tld_annual_renewal_estimate_usd'] = $s['tld_annual_renewal_estimate_usd'] ?? [];
    return $s;
}

function ds_credentials(): array {
    $local = ds_read_json(ds_root() . '/config/credentials.local.json', []);
    $key = getenv('GODADDY_API_KEY') ?: ($local['godaddy_api_key'] ?? '');
    $secret = getenv('GODADDY_API_SECRET') ?: ($local['godaddy_api_secret'] ?? '');
    return ['key' => trim((string)$key), 'secret' => trim((string)$secret)];
}

function ds_require_credentials(): array {
    $c = ds_credentials();
    if ($c['key'] === '' || $c['secret'] === '') {
        throw new RuntimeException('Missing GoDaddy credentials. Create config/credentials.local.json from credentials.example.json or set GODADDY_API_KEY and GODADDY_API_SECRET.');
    }
    return $c;
}

function ds_http_get_json(string $url, array $headers): array {
    if (!function_exists('curl_init')) {
        throw new RuntimeException('PHP cURL extension is required.');
    }
    $ch = curl_init($url);
    if ($ch === false) throw new RuntimeException('Could not initialize cURL.');

    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_FOLLOWLOCATION => false,
        CURLOPT_TIMEOUT => 45,
        CURLOPT_HTTPHEADER => $headers,
        CURLOPT_HEADER => true
    ]);

    $raw = curl_exec($ch);
    if ($raw === false) {
        $err = curl_error($ch);
        curl_close($ch);
        throw new RuntimeException('cURL error: ' . $err);
    }

    $status = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $headerSize = (int)curl_getinfo($ch, CURLINFO_HEADER_SIZE);
    $body = substr($raw, $headerSize);
    curl_close($ch);

    if ($status < 200 || $status >= 300) {
        throw new RuntimeException('GoDaddy API HTTP ' . $status . ': ' . substr($body, 0, 500));
    }

    $data = json_decode($body, true);
    if (!is_array($data)) throw new RuntimeException('GoDaddy API returned non-JSON or unexpected JSON.');
    return $data;
}

function ds_domain_tld(string $domain): string {
    $parts = explode('.', strtolower($domain));
    return count($parts) > 1 ? end($parts) : '';
}

function ds_days_until(?string $date): ?int {
    if (!$date) return null;
    $ts = strtotime($date);
    if ($ts === false) return null;
    return (int)ceil(($ts - time()) / 86400);
}

function ds_estimated_renewal(string $domain, array $settings): float {
    $tld = ds_domain_tld($domain);
    $table = $settings['tld_annual_renewal_estimate_usd'] ?? [];
    return isset($table[$tld]) ? (float)$table[$tld] : (float)$settings['default_annual_renewal_estimate_usd'];
}

function ds_action_hint(array $row): string {
    $days = $row['days_until_expiration'];
    $auto = strtolower((string)$row['renew_auto']);
    if ($days !== null && $days <= 45 && ($auto === 'true' || $auto === '1' || $auto === 'yes')) return 'URGENT REVIEW AUTO-RENEW';
    if ($days !== null && $days <= 90) return 'REVIEW BEFORE RENEWAL';
    return 'CLASSIFY: keep / sell / donate / return / drop';
}

function ds_fetch_domains(): array {
    $settings = ds_settings();
    $creds = ds_require_credentials();

    $base = rtrim((string)$settings['api_base_url'], '/');
    $headers = [
        'Authorization: sso-key ' . $creds['key'] . ':' . $creds['secret'],
        'Accept: application/json',
        'X-Market-Id: ' . (string)$settings['market_id']
    ];
    if (!empty($settings['shopper_id'])) $headers[] = 'X-Shopper-Id: ' . (string)$settings['shopper_id'];

    $all = [];
    $marker = null;
    $limit = 1000;

    for ($i = 0; $i < 50; $i++) {
        $query = ['limit' => $limit];
        if ($marker) $query['marker'] = $marker;
        $url = $base . '/v1/domains?' . http_build_query($query);
        $batch = ds_http_get_json($url, $headers);
        if (!$batch) break;

        foreach ($batch as $d) if (is_array($d)) $all[] = $d;

        if (count($batch) < $limit) break;
        $last = end($batch);
        if (!is_array($last) || empty($last['domain'])) break;
        $marker = (string)$last['domain'];
    }

    return $all;
}

function ds_normalize_domains(array $domains): array {
    $settings = ds_settings();
    $window = (int)$settings['estimate_window_days'];
    $rows = [];

    foreach ($domains as $d) {
        $domain = (string)($d['domain'] ?? '');
        if ($domain === '') continue;

        $expires = (string)($d['expires'] ?? ($d['expirationDate'] ?? ''));
        $days = ds_days_until($expires);
        $est = ds_estimated_renewal($domain, $settings);
        $due = ($days !== null && $days >= 0 && $days <= $window) ? $est : 0.0;

        $row = [
            'domain' => $domain,
            'tld' => ds_domain_tld($domain),
            'status' => (string)($d['status'] ?? ''),
            'expires' => $expires,
            'days_until_expiration' => $days,
            'renew_auto' => isset($d['renewAuto']) ? ($d['renewAuto'] ? 'true' : 'false') : '',
            'renewable' => isset($d['renewable']) ? ($d['renewable'] ? 'true' : 'false') : '',
            'estimated_annual_renewal_usd' => number_format($est, 2, '.', ''),
            'estimated_due_next_' . $window . '_days_usd' => number_format($due, 2, '.', ''),
            'project_bucket' => '',
            'recommended_action' => '',
            'notes' => ''
        ];
        $row['recommended_action'] = ds_action_hint($row);
        $rows[] = $row;
    }

    usort($rows, function($a, $b) {
        $ad = $a['expires'] ?: '9999-12-31';
        $bd = $b['expires'] ?: '9999-12-31';
        return strcmp($ad, $bd);
    });

    return $rows;
}

function ds_csv(array $rows): string {
    $settings = ds_settings();
    $window = (int)$settings['estimate_window_days'];

    $headers = [
        'domain',
        'tld',
        'status',
        'expires',
        'days_until_expiration',
        'renew_auto',
        'renewable',
        'estimated_annual_renewal_usd',
        'estimated_due_next_' . $window . '_days_usd',
        'project_bucket',
        'recommended_action',
        'notes'
    ];

    $fh = fopen('php://temp', 'r+');
    fputcsv($fh, $headers);
    foreach ($rows as $row) {
        $line = [];
        foreach ($headers as $h) $line[] = $row[$h] ?? '';
        fputcsv($fh, $line);
    }
    rewind($fh);
    $csv = stream_get_contents($fh);
    fclose($fh);
    return $csv === false ? '' : $csv;
}

function ds_save_exports(array $rows): array {
    $dir = ds_root() . '/exports';
    if (!is_dir($dir)) mkdir($dir, 0700, true);
    $stamp = date('Y-m-d-His');
    $csvPath = $dir . '/godaddy-domain-inventory-' . $stamp . '.csv';
    $jsonPath = $dir . '/godaddy-domain-inventory-' . $stamp . '.json';
    file_put_contents($csvPath, ds_csv($rows));
    file_put_contents($jsonPath, json_encode($rows, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
    return ['csv' => basename($csvPath), 'json' => basename($jsonPath)];
}