<?php
$config = require __DIR__ . '/config.php';
require __DIR__ . '/lib/PayPalClient.php';
require __DIR__ . '/lib/Storage.php';

try {
    $client = new PayPalClient($config);
    $storage = new Storage($config['storage_path']);

    $pending = $storage->get('pending_onboarding', []);
    $merchants = $storage->get('merchants', []);
    $syncDebug = $storage->get('sync_debug', []);
    $updated = 0;

    foreach ($pending as $track => &$entry) {
        if (!is_array($entry)) continue;
        $school = $entry['school'] ?? null;
        if (!$school) continue;
        if (!empty($entry['merchant_id'])) continue; // already resolved

        $merchantId = null;

        // Try by tracking_id
        $path = '/v1/customer/partners/' . urlencode($config['partner_merchant_id']) . '/merchant-integrations?tracking_id=' . urlencode($track);
        $resp = $client->api('GET', $path);
        $syncDebug[] = ['ts' => time(), 'track' => $track, 'school' => $school, 'attempt' => 'by-tracking', 'status' => $resp['status'] ?? null, 'body' => $resp['body'] ?? null];
        if ($resp['status'] >= 200 && $resp['status'] < 300) {
            if (!empty($resp['body']['merchant_id'])) {
                $foundId = $resp['body']['merchant_id'];
                // Don't accept the partner's own ID - means onboarding not completed
                if (strcasecmp($foundId, $config['partner_merchant_id']) !== 0) {
                    $merchantId = $foundId;
                }
            }
        }

        // Try by partner_referral_id if available
        $ridCandidate = $entry['partner_referral_id'] ?? ($entry['referral_token'] ?? null);
        if (!$merchantId && $ridCandidate) {
            $path = '/v1/customer/partners/' . urlencode($config['partner_merchant_id']) . '/merchant-integrations?onboarded=true';
            $resp2 = $client->api('GET', $path);
            $syncDebug[] = ['ts' => time(), 'track' => $track, 'school' => $school, 'attempt' => 'list-onboarded', 'status' => $resp2['status'] ?? null, 'body_count' => isset($resp2['body']['merchant_integrations']) ? count($resp2['body']['merchant_integrations']) : null];
            if ($resp2['status'] >= 200 && $resp2['status'] < 300 && !empty($resp2['body']['merchant_integrations'])) {
                foreach ($resp2['body']['merchant_integrations'] as $mi) {
                    $rid = $mi['partner_referral_id'] ?? ($mi['referral_id'] ?? null);
                    $foundId = $mi['merchant_id'] ?? null;
                    // Only accept if it's not the partner's own ID
                    if ($rid && strcasecmp($rid, $ridCandidate) === 0 && $foundId && strcasecmp($foundId, $config['partner_merchant_id']) !== 0) {
                        $merchantId = $foundId;
                        break;
                    }
                }
            }
        }

        // Final fallback: list without onboarded filter and match by tracking_id/referral
        if (!$merchantId) {
            $path = '/v1/customer/partners/' . urlencode($config['partner_merchant_id']) . '/merchant-integrations?page_size=200';
            $resp3 = $client->api('GET', $path);
            $syncDebug[] = ['ts' => time(), 'track' => $track, 'school' => $school, 'attempt' => 'list-all', 'status' => $resp3['status'] ?? null, 'body_count' => isset($resp3['body']['merchant_integrations']) ? count($resp3['body']['merchant_integrations']) : null];
            if ($resp3['status'] >= 200 && $resp3['status'] < 300 && !empty($resp3['body']['merchant_integrations'])) {
                foreach ($resp3['body']['merchant_integrations'] as $mi) {
                    $tid = $mi['tracking_id'] ?? null;
                    $rid = $mi['partner_referral_id'] ?? ($mi['referral_id'] ?? null);
                    $foundId = $mi['merchant_id'] ?? null;
                    // Only accept if it's not the partner's own ID
                    if (((!empty($tid) && strcasecmp($tid, $track) === 0) || ($ridCandidate && $rid && strcasecmp($rid, $ridCandidate) === 0)) && $foundId && strcasecmp($foundId, $config['partner_merchant_id']) !== 0) {
                        $merchantId = $foundId;
                        break;
                    }
                }
            }
        }

        // Try reading the partner referral directly (may include status/links); capture merchant_id if present
        if (!$merchantId && $ridCandidate) {
            $path = '/v2/customer/partner-referrals/' . urlencode($ridCandidate);
            $resp4 = $client->api('GET', $path);
            $syncDebug[] = ['ts' => time(), 'track' => $track, 'school' => $school, 'attempt' => 'referral-get', 'status' => $resp4['status'] ?? null, 'body' => $resp4['body'] ?? null];
            if ($resp4['status'] >= 200 && $resp4['status'] < 300 && !empty($resp4['body'])) {
                // naive scan for a merchant_id field anywhere in response
                $stack = [$resp4['body']];
                while (!$merchantId && $stack) {
                    $node = array_pop($stack);
                    if (is_array($node)) {
                        if (isset($node['merchant_id']) && $node['merchant_id']) {
                            $merchantId = $node['merchant_id'];
                            break;
                        }
                        foreach ($node as $v) { if (is_array($v)) { $stack[] = $v; } }
                    }
                }
            }
        }

        if ($merchantId) {
            $entry['merchant_id'] = $merchantId;
            $entry['status'] = 'connected';
            $entry['connected_at'] = time();
            $merchants[$school] = [
                'merchant_id' => $merchantId,
                'tracking_id' => $track,
                'connected_at' => $entry['connected_at'],
            ];
            $updated++;
        } else {
            // Mark as incomplete if no merchant ID found
            $entry['status'] = 'incomplete_onboarding';
            $entry['last_sync_at'] = time();
            $entry['note'] = 'Merchant has not completed PayPal onboarding. Only partner ID is available.';
        }
    }
    unset($entry);

    $storage->set('pending_onboarding', $pending);
    $storage->set('merchants', $merchants);
    $storage->set('sync_debug', $syncDebug);

    header('Location: ' . rtrim($config['base_url'], '/') . '/index.php?sync=' . $updated);
    exit;
} catch (Throwable $e) {
    http_response_code(500);
    echo 'Sync failed: ' . htmlspecialchars($e->getMessage());
}