<?php
header("Content-Type: application/json");
header("Access-Control-Allow-Origin: *");
$action = $_GET["action"] ?? $_POST["action"] ?? "list";
$db_file = "/opt/weval-data/contracts.json";
if (!file_exists(dirname($db_file))) @mkdir(dirname($db_file), 0755, true);
if (!file_exists($db_file)) file_put_contents($db_file, "[]");
$contracts = json_decode(file_get_contents($db_file), true) ?: [];

switch ($action) {
    case "list":
        echo json_encode(["ok"=>true,"count"=>count($contracts),"contracts"=>$contracts]);
        break;
        
    case "create":
        $c = [
            "id" => "CTR-" . date("Ymd") . "-" . str_pad(count($contracts)+1, 3, "0", STR_PAD_LEFT),
            "type" => $_POST["type"] ?? "consulting", // nda, sla, consulting, loi, amendment
            "client" => $_POST["client"] ?? "",
            "title" => $_POST["title"] ?? "",
            "value_mad" => floatval($_POST["value_mad"] ?? 0),
            "currency" => $_POST["currency"] ?? "MAD",
            "start_date" => $_POST["start_date"] ?? date("Y-m-d"),
            "end_date" => $_POST["end_date"] ?? "",
            "status" => "draft", // draft, sent, signed, active, expired, terminated
            "entity" => $_POST["entity"] ?? "WEVAL Consulting SARL",
            "clauses" => [],
            "versions" => [["v"=>1,"date"=>date("c"),"author"=>"system"]],
            "created_at" => date("c"),
            "updated_at" => date("c"),
        ];
        // IA: générer les clauses via Sovereign
        if ($_POST["ai_generate"] ?? false) {
            $prompt = "Génère les clauses principales pour un contrat de type " . $c["type"] . 
                      " entre WEVAL Consulting SARL (Casablanca, Maroc) et " . $c["client"] . 
                      ". Valeur: " . $c["value_mad"] . " " . $c["currency"] . 
                      ". Retourne un JSON array de clauses avec titre et contenu.";
            $ctx2 = stream_context_create(["http"=>["timeout"=>8,"method"=>"POST",
                "header"=>"Content-Type: application/json",
                "content"=>json_encode(["messages"=>[["role"=>"user","content"=>$prompt]],"max_tokens"=>500,"stream"=>false])]]);
            $resp = @file_get_contents("http://127.0.0.1:4000/v1/chat/completions", false, $ctx2);
            $ai = @json_decode($resp, true);
            $c["clauses_ai"] = $ai["choices"][0]["message"]["content"] ?? "Sovereign indisponible";
        }
        $contracts[] = $c;
        file_put_contents($db_file, json_encode($contracts, JSON_PRETTY_PRINT));
        echo json_encode(["ok"=>true,"contract"=>$c]);
        break;
        
    case "get":
        $id = $_GET["id"] ?? "";
        $found = array_filter($contracts, fn($c) => $c["id"] === $id);
        echo json_encode(["ok"=>!empty($found),"contract"=>array_values($found)[0] ?? null]);
        break;
        
    case "update_status":
        $id = $_POST["id"] ?? "";
        $status = $_POST["status"] ?? "";
        foreach ($contracts as &$c) {
            if ($c["id"] === $id) { $c["status"] = $status; $c["updated_at"] = date("c"); }
        }
        file_put_contents($db_file, json_encode($contracts, JSON_PRETTY_PRINT));
        echo json_encode(["ok"=>true]);
        break;
        
    case "templates":
        echo json_encode(["ok"=>true,"templates"=>[
            ["type"=>"nda","name"=>"NDA Standard","desc"=>"Accord de non-divulgation bilatéral"],
            ["type"=>"consulting","name"=>"Contrat Consulting","desc"=>"Prestation de services IT/IA"],
            ["type"=>"sla","name"=>"SLA","desc"=>"Service Level Agreement avec KPIs"],
            ["type"=>"loi","name"=>"Lettre d'intention","desc"=>"LOI avant contrat définitif"],
            ["type"=>"amendment","name"=>"Avenant","desc"=>"Modification contrat existant"],
            ["type"=>"partnership","name"=>"Partenariat","desc"=>"Accord de partenariat commercial"],
        ]]);
        break;
        
    case "stats":
        $by_status = [];
        $total_value = 0;
        foreach ($contracts as $c) {
            $by_status[$c["status"]] = ($by_status[$c["status"]] ?? 0) + 1;
            if ($c["status"] === "active") $total_value += $c["value_mad"];
        }
        echo json_encode(["ok"=>true,"total"=>count($contracts),"by_status"=>$by_status,"total_value_mad"=>$total_value]);
        break;
        
    default:
        echo json_encode(["ok"=>false,"error"=>"Unknown action","actions"=>["list","create","get","update_status","templates","stats"]]);
}
?>