"""Servidor de demonstração sem dependências externas."""

import json
import os
from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
from urllib.parse import urlsplit


class Handler(BaseHTTPRequestHandler):
    def do_GET(self):
        path = urlsplit(self.path).path
        if path == "/healthz":
            status, payload = 200, {"status": "ok"}
        elif path == "/":
            status, payload = 200, {"message": os.environ.get("GREETING", "Olá, Carol!")}
        else:
            status, payload = 404, {"error": "not_found"}

        body = json.dumps(payload, ensure_ascii=False).encode("utf-8")
        self.send_response(status)
        self.send_header("Content-Type", "application/json; charset=utf-8")
        self.send_header("Content-Length", str(len(body)))
        self.end_headers()
        self.wfile.write(body)


if __name__ == "__main__":
    port = int(os.environ.get("PORT", "8080"))
    server = ThreadingHTTPServer(("0.0.0.0", port), Handler)
    print(f"Servidor iniciado na porta {port}", flush=True)
    try:
        server.serve_forever()
    except KeyboardInterrupt:
        pass
    finally:
        server.server_close()