<?php
header('Content-Type: application/json');
$R = ['steps'=>[], 'ok'=>false];
$SRC = '/var/www/weval/wevia-ia/weval-chatbot-api.php';
$TS = date('Ymd-Hi');

$content = file_get_contents($SRC);
$R['steps'][] = ['read' => strlen($content).'B'];

// GOLD
$GOLD = "/opt/wevads/vault/weval-chatbot-api-STREAMFIX-{$TS}.gold.php";
copy($SRC, $GOLD);
$R['steps'][] = ['gold' => $GOLD];

// Target la ligne dans ma zone OPUS4-AUTOWIRE-CHATBOT-v1
$start_marker = 'OPUS4-AUTOWIRE-CHATBOT-v1 (17avr 02h35)';
$end_marker = 'OPUS4-AUTOWIRE-CHATBOT-v1 END';
$ps = strpos($content, $start_marker);
$pe = strpos($content, $end_marker);
if ($ps === false || $pe === false) { $R['steps'][]=['err'=>'markers absent']; die(json_encode($R)); }

$block = substr($content, $ps, $pe - $ps);

// Remplace la source du raw : $GLOBALS["_wevia_raw"] ?? file_get_contents("php://input")
// est déjà tentée, mais si les 2 sont vides ($GLOBALS défini MAIS vide), on fallback sur $_POST
// Meilleur fix : DOUBLE JSON read si premier vide
$old = '$__opus4_raw = $GLOBALS["_wevia_raw"] ?? file_get_contents("php://input");';
$new = '$__opus4_raw = $GLOBALS["_wevia_raw"] ?? (isset($_wevia_raw) ? $_wevia_raw : file_get_contents("php://input"));';

// Aussi: normaliser via $_POST si JSON vide
// Et tracer TOUJOURS qu'on est passé par là pour diagnostic
$trace_inject = '@file_put_contents("/var/log/weval/opus4-autowire.log", date("c") . " CHATBOT_REACHED raw_len=" . strlen($__opus4_raw) . " msg=" . substr($__opus4_msg, 0, 40) . "\n", FILE_APPEND);';

$block_new = str_replace($old, $new, $block);

// Injecte trace line juste apres la définition de $__opus4_msg
$trace_anchor = '$__opus4_msg = mb_strtolower(trim($__opus4_in["message"] ?? ($_POST["message"] ?? "")));';
$trace_new = $trace_anchor . "\n    " . $trace_inject;
$block_new = str_replace($trace_anchor, $trace_new, $block_new);

$R['steps'][] = [
    'stream_fix_applied' => ($block !== $block_new),
    'block_before_len' => strlen($block),
    'block_after_len' => strlen($block_new)
];

$newContent = substr($content, 0, $ps) . $block_new . substr($content, $pe);

// Lint
$TMP = "/tmp/wc-stream-{$TS}.php";
file_put_contents($TMP, $newContent);
exec("php8.4 -l $TMP 2>&1", $lo, $lr);
$R['steps'][] = ['lint_rc' => $lr, 'lint' => $lo];
if ($lr !== 0) { unlink($TMP); $R['steps'][]=['err'=>'LINT FAIL']; die(json_encode($R)); }

// Write
exec('sudo chattr -i '.escapeshellarg($SRC).' 2>&1', $c1, $rc1);
if ($rc1 !== 0) exec('chattr -i '.escapeshellarg($SRC).' 2>&1', $c1, $rc1);
$w = file_put_contents($SRC, $newContent);
exec('sudo chattr +i '.escapeshellarg($SRC).' 2>&1', $c2, $rc2);
if ($rc2 !== 0) exec('chattr +i '.escapeshellarg($SRC).' 2>&1', $c2, $rc2);
$R['steps'][] = ['written' => $w, 'chattr_plus' => $rc2];

exec("php8.4 -l $SRC 2>&1", $flo, $flr);
$R['steps'][] = ['final_lint_rc' => $flr];

@opcache_invalidate($SRC, true);
@opcache_reset();

// Prepare log dir
@mkdir('/var/log/weval', 0755, true);
@file_put_contents('/var/log/weval/opus4-autowire.log', date('c')." FIX_STREAM applied\n", FILE_APPEND);

unlink($TMP);
$R['ok'] = ($flr === 0);
echo json_encode($R, JSON_PRETTY_PRINT);