import fs from "fs";
import path from "path";

const BIN_NAME = "studioE5-agent";

function findVersionFile(): string | null {
  // Try a few common paths relative to the server workspace and Next.js build output.
  const candidates = [
    path.join(process.cwd(), "..", "agent", "VERSION"),
    path.join(process.cwd(), "..", "..", "agent", "VERSION"),
    path.join(process.cwd(), "agent", "VERSION"),
    path.join(__dirname, "..", "..", "..", "agent", "VERSION"),
    path.join(__dirname, "..", "..", "agent", "VERSION"),
    "/app/agent-version",
  ];
  for (const candidate of candidates) {
    if (fs.existsSync(candidate)) {
      return candidate;
    }
  }
  return null;
}

export function getAgentVersion(): string {
  const versionFile = findVersionFile();
  if (versionFile) {
    return fs.readFileSync(versionFile, "utf-8").trim();
  }
  // Fallback used when the agent workspace is not mounted (should not happen).
  return "0.3.9";
}

export interface AgentDownloadUrls {
  windows: string;
  windowsZip: string;
  linux: string;
  mac: string;
}

export function getAgentDownloadUrls(version: string): AgentDownloadUrls {
  return {
    windows: `/${BIN_NAME}-v${version}.exe`,
    windowsZip: `/${BIN_NAME}-v${version}-windows.zip`,
    linux: `/${BIN_NAME}-v${version}`,
    mac: `/${BIN_NAME}-v${version}-mac`,
  };
}

export function getAgentVersionInfo() {
  const version = getAgentVersion();
  return {
    version,
    downloadUrls: getAgentDownloadUrls(version),
  };
}