import type { SourceRCONCommandRequest } from "../api/types";

const maxManagementCommandBytes = 8192;

export function scumSourceRCONCommandRequest(serverInstanceId: string, command: string, sequence = Date.now()): SourceRCONCommandRequest {
  const stamp = Math.max(0, Math.floor(sequence));
  return {
    kind: "command",
    command: normalizeSCUMManagementCommand(command, "管理指令"),
    idempotencyKey: `web:scum-rcon:${safeBridgeIdentifierPart(serverInstanceId)}:${stamp}`,
  };
}

export function scumSourceRCONChatRequest(serverInstanceId: string, message: string, sequence = Date.now()): SourceRCONCommandRequest {
  const stamp = Math.max(0, Math.floor(sequence));
  return {
    kind: "chat",
    chatType: 4,
    message: validateSCUMManagementRCONText(message, "聊天内容"),
    idempotencyKey: `web:scum-rcon-chat:${safeBridgeIdentifierPart(serverInstanceId)}:${stamp}`
  };
}

export function validateSCUMManagementRCONText(value: string, label: string): string {
  const normalized = value.trim();
  if (!normalized || new TextEncoder().encode(normalized).byteLength > maxManagementCommandBytes || /[\u0000\r\n]/.test(normalized)) {
    throw new Error(`${label}必须是单行文本。`);
  }
  return normalized;
}

function normalizeSCUMManagementCommand(value: string, label: string): string {
  const normalized = validateSCUMManagementRCONText(value, label);
  return normalized.startsWith("#") ? normalized : `#${normalized}`;
}

function safeBridgeIdentifierPart(value: string): string {
  const normalized = value.trim().replace(/[^A-Za-z0-9._:-]+/g, "-").replace(/^[^A-Za-z0-9]+|[^A-Za-z0-9]+$/g, "").slice(0, 96);
  return normalized || "server";
}