<?php
header("Content-Type: application/json");
header("Access-Control-Allow-Origin: *");
// V85 LinkedIn->demo tracking - bumps linkedin_to_demo KPI from TBD to tracked
$log = '/opt/weval-l99/linkedin-demo-hits.jsonl';
$action = $_GET['action'] ?? 'stats';

if ($action === 'hit') {
    $entry = [
        'ts' => date('c'),
        'ref' => $_SERVER['HTTP_REFERER'] ?? '',
        'ua' => $_SERVER['HTTP_USER_AGENT'] ?? '',
        'ip' => $_SERVER['REMOTE_ADDR'] ?? '',
        'utm' => $_GET['utm_source'] ?? '',
        'from_linkedin' => preg_match('/linkedin\.com/i', $_SERVER['HTTP_REFERER'] ?? '') ? 1 : 0,
    ];
    @file_put_contents($log, json_encode($entry)."\n", FILE_APPEND);
    echo json_encode(['ok'=>true,'tracked'=>true]);
    exit;
}
// Stats
$month_start = strtotime(date('Y-m-01'));
$hits_month = 0; $from_linkedin = 0;
if (file_exists($log)) {
    foreach (file($log) as $line) {
        $e = @json_decode($line, true);
        if (!$e) continue;
        if (strtotime($e['ts']) >= $month_start) {
            $hits_month++;
            if ($e['from_linkedin'] ?? 0) $from_linkedin++;
        }
    }
}
echo json_encode([
    'v' => 'V85-demo-tracker',
    'month_hits_total' => $hits_month,
    'linkedin_referrer_month' => $from_linkedin,
    'target_per_month' => 30,
    'status' => $from_linkedin >= 30 ? 'OK' : ($from_linkedin >= 10 ? 'PROGRESSING' : 'BELOW'),
    'pixel_url' => 'https://weval-consulting.com/api/v85-demo-tracker.php?action=hit',
    'integration' => 'Add <img src="..." width=1 height=1> in LinkedIn post CTAs landing pages',
], JSON_PRETTY_PRINT);