<?php
// SMART_ROUTING: Auto-fallback chain
// groq→cerebras→sambanova, cerebras→groq→sambanova, etc.
// TODO: Implement provider health check + auto-retry on 429/500/timeout

/**
 * OpenClaw Multi-Provider Proxy API v2
 * 10 providers, 35+ models, streaming SSE
 */
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST, GET, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type');
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') { exit; }
@require_once '/opt/wevads/vault/credentials.php';

$PROVIDERS = [
    'groq' => ['name'=>'Groq','tier'=>'free','speed'=>'ultra',
        'base_url'=>'https://api.groq.com/openai/v1',
        'api_key'=>defined('GROQ_KEY')?GROQ_KEY:'',
        'models'=>['llama-3.3-70b-versatile'=>'Llama 3.3 70B','llama-3.1-8b-instant'=>'Llama 3.1 8B Instant','meta-llama/llama-4-scout-17b-16e-instruct'=>'Llama 4 Scout 17B Vision','gemma2-9b-it'=>'Gemma 2 9B','mixtral-8x7b-32768'=>'Mixtral 8x7B']],
    'cerebras' => ['name'=>'Cerebras','tier'=>'free','speed'=>'ultra',
        'base_url'=>'https://api.cerebras.ai/v1',
        'api_key'=>defined('CEREBRAS_KEY')?CEREBRAS_KEY:'',
        'models'=>['qwen-3-235b-a22b-instruct-2507'=>'Qwen 3 235B','llama-3.3-70b'=>'Llama 3.3 70B','llama-3.1-8b'=>'Llama 3.1 8B']],
    'sambanova' => ['name'=>'SambaNova','tier'=>'free','speed'=>'ultra',
        'base_url'=>'https://api.sambanova.ai/v1',
        'api_key'=>defined('SAMBANOVA_KEY')?SAMBANOVA_KEY:'',
        'models'=>['Meta-Llama-3.3-70B-Instruct'=>'Llama 3.3 70B','Meta-Llama-3.1-8B-Instruct'=>'Llama 3.1 8B','DeepSeek-V3.1'=>'DeepSeek V3.1','DeepSeek-R1'=>'DeepSeek R1 Reasoning']],
    'mistral' => ['name'=>'Mistral AI','tier'=>'free','speed'=>'fast',
        'base_url'=>'https://api.mistral.ai/v1',
        'api_key'=>defined('MISTRAL_KEY')?MISTRAL_KEY:'',
        'models'=>['mistral-small-latest'=>'Mistral Small','open-mistral-nemo'=>'Mistral Nemo 12B','codestral-latest'=>'Codestral Code']],
    'deepseek' => ['name'=>'DeepSeek','tier'=>'free','speed'=>'fast',
        'base_url'=>'https://api.deepseek.com',
        'api_key'=>defined('DEEPSEEK_KEY')?DEEPSEEK_KEY:'',
        'models'=>['deepseek-chat'=>'DeepSeek V3 Chat','deepseek-reasoner'=>'DeepSeek R1 Reasoner']],
    'gemini' => ['name'=>'Google Gemini','tier'=>'free','speed'=>'fast',
        'base_url'=>'https://generativelanguage.googleapis.com/v1beta/openai',
        'api_key'=>defined('GEMINI_KEY')?GEMINI_KEY:'',
        'models'=>['gemini-2.0-flash'=>'Gemini 2.0 Flash','gemini-2.0-flash-lite'=>'Gemini 2.0 Flash Lite','gemini-1.5-pro'=>'Gemini 1.5 Pro']],
    'alibaba' => ['name'=>'Alibaba Qwen','tier'=>'free','speed'=>'fast',
        'base_url'=>'https://dashscope-intl.aliyuncs.com/compatible-mode/v1',
        'api_key'=>defined('DASHSCOPE_KEY')?DASHSCOPE_KEY:'',
        'models'=>['qwen-turbo-latest'=>'Qwen Turbo','qwen-plus-latest'=>'Qwen Plus','qwen-max'=>'Qwen Max']],
    'anthropic' => ['name'=>'Anthropic Claude','tier'=>'paid','speed'=>'fast',
        'base_url'=>'https://api.anthropic.com/v1',
        'api_key'=>defined('ANTHROPIC_KEY')?ANTHROPIC_KEY:'',
        'models'=>['claude-sonnet-4-20250514'=>'Claude Sonnet 4','claude-haiku-4-5-20251001'=>'Claude Haiku 4.5'],
        'custom_format'=>'anthropic'],
    'ollama-s204' => ['name'=>'Ollama S204 Sovereign','tier'=>'sovereign','speed'=>'slow',
        'base_url'=>'http://localhost:11434/v1',
        'api_key'=>'ollama',
        'models'=>['qwen3:8b'=>'Qwen 3 8B','qwen3:4b'=>'Qwen 3 4B','qwen2.5:7b'=>'Qwen 2.5 7B','qwen3.5:0.8b'=>'Qwen 3.5 0.8B Tiny','granite4:latest'=>'IBM Granite 4','mistral:latest'=>'Mistral 7B','glm4:9b'=>'GLM-4 9B Zhipu','medllama2:latest'=>'MedLlama 2 Medical','meditron:7b'=>'Meditron 7B Medical','weval-brain:latest'=>'WEVAL Brain Custom']],
    'ollama-s151' => ['name'=>'Ollama S151 OVH','tier'=>'sovereign','speed'=>'slow',
        'base_url'=>'http://151.80.235.110:11434/v1',
        'api_key'=>'ollama',
        'models'=>['qwen3:4b'=>'Qwen 3 4B','qwen3.5:0.8b'=>'Qwen 3.5 0.8B','granite4:latest'=>'IBM Granite 4','phi4-mini:latest'=>'Microsoft Phi-4 Mini','smollm2:135m'=>'SmolLM2 135M Ultra-tiny']],
];

if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    header('Content-Type: application/json');
    $out = []; $tm = 0;
    foreach ($PROVIDERS as $id => $p) {
        $models = [];
        foreach ($p['models'] as $mid => $mname) { $models[] = ['id'=>$mid,'name'=>$mname]; $tm++; }
        $out[] = ['id'=>$id,'name'=>$p['name'],'tier'=>$p['tier'],'speed'=>$p['speed'],'models'=>$models,'has_key'=>!empty($p['api_key'])&&strlen($p['api_key'])>5];
    }
    echo json_encode(['providers'=>$out,'total_models'=>$tm]);
    exit;
}

header('Content-Type: application/json');
$input = json_decode(file_get_contents('php://input'), true);
if (!$input) { http_response_code(400); echo json_encode(['error'=>'Invalid JSON']); exit; }

$provider_id = $input['provider'] ?? 'groq';
$model = $input['model'] ?? '';
$messages = $input['messages'] ?? [];
$stream = $input['stream'] ?? false;
$system = $input['system'] ?? '';

if (!isset($PROVIDERS[$provider_id])) { http_response_code(400); echo json_encode(['error'=>'Unknown provider']); exit; }
$provider = $PROVIDERS[$provider_id];
if (empty($provider['api_key'])||strlen($provider['api_key'])<5) { http_response_code(400); echo json_encode(['error'=>'No API key for '.$provider['name']]); exit; }
if (!$model) $model = array_key_first($provider['models']);

$msgs = $messages;
if ($system) array_unshift($msgs, ['role'=>'system','content'=>$system]);

if (($provider['custom_format'] ?? '') === 'anthropic') {
    $url = $provider['base_url'].'/messages';
    $user_msgs = array_values(array_filter($msgs, fn($m)=>$m['role']!=='system'));
    $payload = json_encode(['model'=>$model,'max_tokens'=>intval($input['max_tokens']??4096),'system'=>$system?:'You are a helpful assistant.','messages'=>$user_msgs,'stream'=>$stream]);
    $headers = ['Content-Type: application/json','x-api-key: '.$provider['api_key'],'anthropic-version: 2023-06-01'];
} else {
    $url = $provider['base_url'].'/chat/completions';
    $payload = json_encode(['model'=>$model,'messages'=>$msgs,'stream'=>$stream,'max_tokens'=>intval($input['max_tokens']??4096),'temperature'=>floatval($input['temperature']??0.7)]);
    $headers = ['Content-Type: application/json','Authorization: Bearer '.$provider['api_key']];
}

if ($stream) {
    header('Content-Type: text/event-stream');
    header('Cache-Control: no-cache');
    header('Connection: keep-alive');
    $ch = curl_init($url);
    curl_setopt_array($ch, [CURLOPT_POST=>true,CURLOPT_POSTFIELDS=>$payload,CURLOPT_HTTPHEADER=>$headers,CURLOPT_RETURNTRANSFER=>false,CURLOPT_TIMEOUT=>120,CURLOPT_SSL_VERIFYPEER=>false,
        CURLOPT_WRITEFUNCTION=>function($ch,$data){echo $data;if(ob_get_level())ob_flush();flush();return strlen($data);}]);
    curl_exec($ch); curl_close($ch);
} else {
    $ch = curl_init($url);
    curl_setopt_array($ch, [CURLOPT_POST=>true,CURLOPT_POSTFIELDS=>$payload,CURLOPT_HTTPHEADER=>$headers,CURLOPT_RETURNTRANSFER=>true,CURLOPT_TIMEOUT=>120,CURLOPT_SSL_VERIFYPEER=>false]);
    $resp = curl_exec($ch); $code = curl_getinfo($ch, CURLINFO_HTTP_CODE); curl_close($ch);
    if (($provider['custom_format']??'')==='anthropic') {
        $d = json_decode($resp, true);
        if (isset($d['content'][0]['text'])) $resp = json_encode(['choices'=>[['message'=>['role'=>'assistant','content'=>$d['content'][0]['text']]]],'model'=>$d['model']??$model,'usage'=>$d['usage']??[]]);
    }
    http_response_code($code?:500); echo $resp;
}