<?php
/**
 * WEVAL CSAT - Customer Satisfaction Score sovereign 21avr2026
 * Rating 1-5 after resolved ticket/interaction.
 * Storage: /opt/weval-l99/data/csat-responses.jsonl
 */
header('Content-Type: application/json');

$STORAGE = '/opt/weval-l99/data/csat-responses.jsonl';
@mkdir(dirname($STORAGE), 0755, true);

$action = $_GET['action'] ?? ($_POST['action'] ?? 'stats');

if ($action === 'submit' && $_SERVER['REQUEST_METHOD'] === 'POST') {
    $rating = intval($_POST['rating'] ?? -1);
    $context = substr(trim($_POST['context'] ?? ''), 0, 200);
    $user = substr(trim($_POST['user'] ?? 'anonymous'), 0, 60);
    if ($rating < 1 || $rating > 5) {
        echo json_encode(['ok'=>false,'error'=>'invalid_rating','expected'=>'1-5']);
        exit;
    }
    @file_put_contents($STORAGE, json_encode(['ts'=>date('c'),'rating'=>$rating,'context'=>$context,'user'=>$user])."\n", FILE_APPEND | LOCK_EX);
    echo json_encode(['ok'=>true,'recorded'=>true]);
    exit;
}

$responses = [];
if (is_readable($STORAGE)) {
    foreach (file($STORAGE) as $line) {
        $r = @json_decode(trim($line), true);
        if ($r && isset($r['rating'])) $responses[] = $r;
    }
}

$n = count($responses);
if ($n === 0) {
    echo json_encode(['ok'=>true,'source'=>'sovereign_jsonl','ts'=>date('c'),'csat_score_pct'=>0,'responses_total'=>0,'status'=>'wire_needed','drill'=>'No ratings yet. POST /api/csat-api.php?action=submit']);
    exit;
}

// CSAT = % ratings >= 4 (out of 5)
$satisfied = 0;
foreach ($responses as $r) if ($r['rating'] >= 4) $satisfied++;
$pct = round(($satisfied / $n) * 100);

echo json_encode([
    'ok'=>true,
    'source'=>'sovereign_jsonl',
    'ts'=>date('c'),
    'csat_score_pct'=>$pct,
    'responses_total'=>$n,
    'satisfied_count'=>$satisfied,
    'status'=>$pct >= 85 ? 'ok' : ($pct > 0 ? 'warn' : 'wire_needed'),
    'drill'=>"% ratings >=4 out of 5",
]);