<?php
// WEVIA DeepSeek Web Bridge
// Uses chat.deepseek.com internal API with extracted auth token
// Token must be set manually: POST /api/wevia-deepseek-proxy.php?action=set_token&token=xxx

$action = $_GET['action'] ?? $_POST['action'] ?? '';
$token_file = "/etc/weval/deepseek-web-token.txt";

// SET TOKEN (one-time setup by Yacine)
if ($action === 'set_token') {
    $token = $_POST['token'] ?? $_GET['token'] ?? '';
    if (strlen($token) > 20) {
        file_put_contents($token_file, $token);
        echo json_encode(["status" => "ok", "message" => "DeepSeek Web token saved", "len" => strlen($token)]);
    } else {
        echo json_encode(["error" => "Token too short"]);
    }
    exit;
}

// CHECK TOKEN
if ($action === 'check_token') {
    $exists = file_exists($token_file);
    $len = $exists ? strlen(trim(file_get_contents($token_file))) : 0;
    echo json_encode(["has_token" => $exists, "token_len" => $len]);
    exit;
}

// CHAT via DeepSeek Web API
function deepseek_web_chat($message, $history = [], $model = "deepseek_chat") {
    global $token_file;
    if (!file_exists($token_file)) return null;
    $token = trim(file_get_contents($token_file));
    if (!$token) return null;
    
    $messages = [];
    foreach ($history as $h) {
        $messages[] = ["role" => $h["role"], "content" => $h["content"]];
    }
    $messages[] = ["role" => "user", "content" => $message];
    
    $data = json_encode([
        "message" => $message,
        "model_preference" => null,
        "model_class" => $model, // deepseek_chat or deepseek_code
        "temperature" => 0,
        "top_p" => 0.7,
        "max_tokens" => 8192,
        "search_enabled" => false,
        "thinking_enabled" => ($model === "deepseek_reasoner"),
    ], JSON_UNESCAPED_UNICODE);
    
    // Call DeepSeek Web internal API
    $ch = curl_init("https://chat.deepseek.com/api/v0/chat/completions");
    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => $data,
        CURLOPT_HTTPHEADER => [
            "Content-Type: application/json",
            "Authorization: Bearer $token",
            "Accept: application/json",
            "Origin: https://chat.deepseek.com",
            "Referer: https://chat.deepseek.com/",
        ],
        CURLOPT_TIMEOUT => 60,
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_USERAGENT => "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36",
    ]);
    $r = curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    
    if ($code === 200) {
        $d = @json_decode($r, true);
        $content = $d["choices"][0]["message"]["content"] ?? null;
        if ($content) {
            return ["content" => $content, "provider" => "DeepSeek Web (FREE unlimited)", "model" => $model, "tokens" => ($d["usage"]["total_tokens"] ?? 0)];
        }
    } elseif ($code === 401) {
        // Token expired
        return ["error" => "Token expired. Re-extract from chat.deepseek.com DevTools."];
    }
    
    return null;
}