<?php
require_once __DIR__.'/weval-brand-guard.php';
header('Content-Type: text/event-stream');
header('Cache-Control: no-cache');
header('X-Accel-Buffering: no');
header('Access-Control-Allow-Origin: *');
if(ob_get_level())ob_end_clean();

$token=$_GET['token']??'';
if($token!=='L99CHAT2026'){echo "data: ".json_encode(['t'=>'Auth required'])."

data: [DONE]

";exit;}
$q=$_GET['q']??'';
if(!$q){echo "data: ".json_encode(['t'=>'No query'])."

data: [DONE]

";exit;}

$env=[];
foreach(file('/etc/weval/secrets.env',FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES) as $l){
    if($l[0]==='#'||!strpos($l,'='))continue;
    [$k,$v]=explode('=',$l,2);
    $env[trim($k)]=trim($v,'" ');
}

$sys="'.WEVAL_BRAND_CONTEXT.'Tu es L99 Brain, l'IA souveraine de WEVAL Consulting. Expert DevOps, Lean Six Sigma, architecture cloud. Reponds en francais, concis et actionnable.";
$msgs=[['role'=>'system','content'=>$sys],['role'=>'user','content'=>$q]];

// Cascade: Groq → Cerebras → Ollama
$providers=[
    ['n'=>'SambaNova','u'=>'https://api.sambanova.ai/v1/chat/completions','k'=>$env['SAMBANOVA_KEY']??'','m'=>'Llama-4-Maverick-17B-128E-Instruct'],
    ['n'=>'SambaNova','u'=>'https://api.sambanova.ai/v1/chat/completions','k'=>$env['SAMBANOVA_KEY']??'','m'=>'Meta-Llama-3.3-70B-Instruct'],
    ['n'=>'Groq','u'=>'https://api.groq.com/openai/v1/chat/completions','k'=>$env['GROQ_KEY']??'','m'=>'moonshotai/kimi-k2-instruct'],
    ['n'=>'Mistral','u'=>'https://api.mistral.ai/v1/chat/completions','k'=>$env['MISTRAL_KEY']??'','m'=>'mistral-small-latest'],
    ['n'=>'Cerebras','u'=>'https://api.cerebras.ai/v1/chat/completions','k'=>$env['CEREBRAS_API_KEY']??'','m'=>'qwen-3-235b-a22b-instruct-2507'],
    ['n'=>'Groq','u'=>'https://api.groq.com/openai/v1/chat/completions','k'=>$env['GROQ_KEY']??'','m'=>'llama-3.3-70b-versatile'],
];

foreach($providers as $p){
    if(!$p['k'])continue;
    $ch=curl_init($p['u']);
    curl_setopt_array($ch,[
        CURLOPT_POST=>1,
        CURLOPT_POSTFIELDS=>json_encode(['model'=>$p['m'],'messages'=>$msgs,'stream'=>true,'max_tokens'=>1500]),
        CURLOPT_HTTPHEADER=>['Content-Type: application/json','Authorization: Bearer '.$p['k']],
        CURLOPT_RETURNTRANSFER=>0,CURLOPT_TIMEOUT=>25,
        CURLOPT_WRITEFUNCTION=>function($c,$d)use($p){
            foreach(explode("
",$d) as $line){
                $line=trim($line);
                if(!$line||$line==='data: [DONE]')continue;
                if(strpos($line,'data: ')===0)$line=substr($line,6);
                $j=@json_decode($line,1);
                if(!$j)continue;
                $t=$j['choices'][0]['delta']['content']??'';
                if($t){echo "data: ".json_encode(['t'=>$t,'p'=>$p['n']])."

";@ob_flush();flush();}
            }
            return strlen($d);
        }
    ]);
    $ok=curl_exec($ch);
    $code=curl_getinfo($ch,CURLINFO_HTTP_CODE);
    curl_close($ch);
    if($code>=200&&$code<400){echo "data: [DONE]

";exit;}
}

// Fallback: Ollama local
$ch2=curl_init('http://127.0.0.1:11434/api/chat');
curl_setopt_array($ch2,[
    CURLOPT_POST=>1,
    CURLOPT_POSTFIELDS=>json_encode(['model'=>'qwen3:8b','messages'=>$msgs,'stream'=>true]),
    CURLOPT_HTTPHEADER=>['Content-Type: application/json'],
    CURLOPT_RETURNTRANSFER=>0,CURLOPT_TIMEOUT=>30,
    CURLOPT_WRITEFUNCTION=>function($c,$d){
        foreach(explode("
",$d) as $line){
            $j=@json_decode(trim($line),1);
            if($j&&isset($j['message']['content'])){
                echo "data: ".json_encode(['t'=>$j['message']['content'],'p'=>'Ollama'])."

";
                @ob_flush();flush();
            }
        }
        return strlen($d);
    }
]);
curl_exec($ch2);curl_close($ch2);
echo "data: [DONE]

";