import path from "node:path";
import { fileURLToPath } from "node:url";
import tailwindcss from "@tailwindcss/vite";
import react from "@vitejs/plugin-react";
import { defineConfig, loadEnv, type Plugin } from "vite";

const DEFAULT_AGENTS24_BASE_URL = "https://api.agents24.dev";

export function agents24ConnectOrigin(value: string | undefined): string {
  const candidate = String(value || DEFAULT_AGENTS24_BASE_URL).trim();
  let url: URL;
  try {
    url = new URL(candidate);
  } catch {
    throw new Error("VITE_AGENTS24_BASE_URL must be a valid absolute HTTP(S) URL.");
  }
  if (!["http:", "https:"].includes(url.protocol)) {
    throw new Error("VITE_AGENTS24_BASE_URL must be a valid absolute HTTP(S) URL.");
  }
  return url.origin;
}

function agents24CspPlugin(connectOrigin: string): Plugin {
  return {
    name: "agents24-csp",
    transformIndexHtml(html) {
      return html.replaceAll("__AGENTS24_CONNECT_SOURCE__", connectOrigin);
    },
  };
}

export default defineConfig(({ mode }) => {
  const environment = loadEnv(mode, process.cwd(), "");
  const connectOrigin = agents24ConnectOrigin(environment.VITE_AGENTS24_BASE_URL);
  return {
    plugins: [agents24CspPlugin(connectOrigin), react(), tailwindcss()],
    resolve: { alias: { "@": path.resolve(fileURLToPath(new URL(".", import.meta.url)), "./src") } },
    server: { host: "127.0.0.1" },
  };
});