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package com.naharoo.commons.mstoolkit.rest.exceptionhandler;

import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;

public class HttpServletRequestInfoBuilder {

  private final HttpServletRequest httpRequest;

  private HttpServletRequestInfoBuilder(HttpServletRequest httpRequest) {
    Assert.notNull(httpRequest, "httpRequest cannot be null.");
    this.httpRequest = httpRequest;
  }

  public static HttpServletRequestInfoBuilder newInstance(HttpServletRequest httpRequest) {
    return new HttpServletRequestInfoBuilder(httpRequest);
  }

  private String getUri() {
    StringBuilder uriBuilder = new StringBuilder(this.httpRequest.getRequestURI());
    String queryString = this.httpRequest.getQueryString();
    if (StringUtils.hasText(queryString)) {
      uriBuilder.append("?").append(queryString);
    }

    return uriBuilder.toString();
  }

  private void appendUri(StringBuilder builder) {
    Assert.notNull(builder, "builder cannot be null.");
    builder.append("uri:'").append(this.getUri()).append("'");
  }

  private String getHttpMethod() {
    return this.httpRequest.getMethod();
  }

  private void appendHttpMethod(StringBuilder builder) {
    Assert.notNull(builder, "builder cannot be null.");
    builder.append("method:'").append(this.getHttpMethod()).append("'");
  }

  private void appendHttpMethodAndUri(StringBuilder builder) {
    Assert.notNull(builder, "builder cannot be null.");
    this.appendHttpMethod(builder);
    builder.append(", ");
    this.appendUri(builder);
  }

  public String build() {
    StringBuilder infoBuilder = new StringBuilder();
    this.appendHttpMethodAndUri(infoBuilder);
    return infoBuilder.toString();
  }

  public String toString() {
    return this.build();
  }
}