package de.ph87.home.tvheadend.api;

import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.hc.client5.http.utils.Base64;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.nio.charset.StandardCharsets;

@Slf4j
@Service
@RequiredArgsConstructor
@SuppressWarnings("unused")
public class TvheadendHttpHelper {

  private static final String URL = "http://10.0.0.50:9981/api/%s";

  private final ObjectMapper objectMapper;

  @NonNull
  public <T> T get(@NonNull final String path, @NonNull final Class<? extends T> clazz) throws IOException {
    return parse(clazz, open(false, path));
  }

  public void post(@NonNull final String path, @NonNull final Object request) throws IOException {
    final HttpURLConnection connection = openPost(path, request);
    if (connection.getResponseCode() != 200) {
      throw new IOException("Response code: " + connection.getResponseCode());
    }
  }

  @NonNull
  public <T> T post(@NonNull final String path, @NonNull final Object request, @NonNull final Class<? extends T> clazz) throws IOException {
    return parse(clazz, openPost(path, request));
  }

  @NonNull
  private static HttpURLConnection openPost(@NonNull final String path, @NonNull final Object request) throws IOException {
    final HttpURLConnection connection = open(true, path);
    connection.getOutputStream().write(request.toString().getBytes());
    return connection;
  }

  @NonNull
  private <T> T parse(@NonNull final Class<? extends T> clazz, @NonNull final HttpURLConnection connection) throws IOException {
    final String response = new String(connection.getInputStream().readAllBytes());
    log.debug(response);
    try {
      return objectMapper.readValue(response, clazz);
    } catch (JsonMappingException e) {
      log.error("Failed to deserialize json: {}", e.getMessage());
      log.error(response);
      throw e;
    }
  }

  @NonNull
  private static HttpURLConnection open(final boolean post, @NonNull final String path) throws IOException {
    final String url = URL.formatted(path);
    final String method = post ? "POST" : "GET";
    log.debug("open {} {}", method, url);
    final HttpURLConnection connection = (HttpURLConnection) URI.create(url).toURL().openConnection();
    connection.setRequestMethod(method);
    connection.setDoOutput(post);
    connection.setRequestProperty("Authorization", "Basic " + new String(Base64.encodeBase64("api:api".getBytes(StandardCharsets.UTF_8))));
    return connection;
  }

}