<?php
declare(strict_types=1);

require_once __DIR__ . '/../../src/Auth.php';
require_once __DIR__ . '/../../src/Db.php';
require_once __DIR__ . '/../../src/Lookups.php';

Auth::requireSocio();
header('Content-Type: application/json; charset=utf-8');

if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') { http_response_code(204); exit; }

const ROLES = ['socio','abogado','usuario'];

function ok($data = null): void {
    echo json_encode(['ok' => true, 'data' => $data, 'user' => Auth::user()], JSON_UNESCAPED_UNICODE);
    exit;
}
function err(string $msg, int $code = 400): void {
    http_response_code($code);
    echo json_encode(['ok' => false, 'error' => $msg], JSON_UNESCAPED_UNICODE);
    exit;
}
function body(): array {
    return json_decode((string) file_get_contents('php://input'), true) ?? [];
}

$method = $_SERVER['REQUEST_METHOD'];
$action = $_GET['action'] ?? '';
$me     = Auth::userId();
$pdo    = Db::pdo();

try {
    if ($method === 'GET' && $action === 'list_users') {
        ok(Lookups::allUsers());
    }

    if ($method === 'POST' && $action === 'create_user') {
        $b = body();
        $email = strtolower(trim((string)($b['email'] ?? '')));
        if ($email === '') err('email requerido');
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) err('email inválido');

        $name   = trim((string)($b['name'] ?? ''));
        $role   = in_array(($b['role'] ?? ''), ROLES, true) ? $b['role'] : 'usuario';
        $activo = (int)($b['activo'] ?? 1) === 1 ? 1 : 0;
        $orden  = (int)($b['orden'] ?? 0);

        $exists = $pdo->prepare('SELECT id FROM users WHERE email = :e');
        $exists->execute([':e' => $email]);
        if ($exists->fetch()) err('Ya existe un usuario con ese email', 409);

        $ins = $pdo->prepare(
            'INSERT INTO users (email, name, role, activo, orden, first_seen_at, last_login_at)
             VALUES (:email, :name, :role, :activo, :orden, NULL, NULL)'
        );
        $ins->execute([
            ':email' => $email, ':name' => $name, ':role' => $role,
            ':activo' => $activo, ':orden' => $orden,
        ]);
        $id = (int)$pdo->lastInsertId();

        $sel = $pdo->prepare('SELECT id, email, name, role, activo, orden, first_seen_at, last_login_at FROM users WHERE id = :id');
        $sel->execute([':id' => $id]);
        $row = $sel->fetch();
        $row['id'] = (int)$row['id'];
        $row['activo'] = (int)$row['activo'];
        $row['orden'] = (int)$row['orden'];
        ok($row);
    }

    if ($method === 'PUT' && $action === 'update_user') {
        $b  = body();
        $id = (int)($b['_id'] ?? 0);
        if (!$id) err('id requerido');

        $sel = $pdo->prepare('SELECT id, email, role, activo FROM users WHERE id = :id');
        $sel->execute([':id' => $id]);
        $existing = $sel->fetch();
        if (!$existing) err('Usuario no encontrado', 404);

        $newRole   = in_array(($b['role'] ?? $existing['role']), ROLES, true) ? $b['role'] : $existing['role'];
        $newActivo = isset($b['activo']) ? ((int)$b['activo'] === 1 ? 1 : 0) : (int)$existing['activo'];

        // Salvaguardas: el socio no puede demoverse ni desactivarse a sí mismo
        if ((int)$existing['id'] === $me) {
            if ($newRole !== 'socio') err('No puedes quitarte el rol de Socio a ti mismo', 400);
            if ($newActivo === 0)     err('No puedes desactivarte a ti mismo', 400);
        }

        $newEmail = isset($b['email']) ? strtolower(trim((string)$b['email'])) : $existing['email'];
        if (!filter_var($newEmail, FILTER_VALIDATE_EMAIL)) err('email inválido');
        if ($newEmail !== $existing['email']) {
            $chk = $pdo->prepare('SELECT id FROM users WHERE email = :e AND id != :id');
            $chk->execute([':e' => $newEmail, ':id' => $id]);
            if ($chk->fetch()) err('Otro usuario ya tiene ese email', 409);
        }

        $name  = trim((string)($b['name'] ?? ''));
        $orden = (int)($b['orden'] ?? 0);

        $upd = $pdo->prepare(
            'UPDATE users SET email = :email, name = :name, role = :role,
                              activo = :activo, orden = :orden
             WHERE id = :id'
        );
        $upd->execute([
            ':email' => $newEmail, ':name' => $name, ':role' => $newRole,
            ':activo' => $newActivo, ':orden' => $orden,
            ':id' => $id,
        ]);

        $sel = $pdo->prepare('SELECT id, email, name, role, activo, orden, first_seen_at, last_login_at FROM users WHERE id = :id');
        $sel->execute([':id' => $id]);
        $row = $sel->fetch();
        $row['id'] = (int)$row['id'];
        $row['activo'] = (int)$row['activo'];
        $row['orden'] = (int)$row['orden'];
        ok($row);
    }

    err('Acción no reconocida', 404);

} catch (PDOException $e) {
    error_log('admin db error: ' . $e->getMessage());
    err('Error de base de datos', 500);
} catch (Throwable $e) {
    error_log('admin error: ' . $e->getMessage());
    err('Error interno', 500);
}