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package io.vertx.ext.web.api.impl;

import io.vertx.codegen.annotations.Nullable;
import io.vertx.core.json.JsonArray;
import io.vertx.core.json.JsonObject;
import io.vertx.ext.web.api.RequestParameter;

import java.util.*;
import java.util.stream.Collector;
import java.util.stream.Collectors;

/**
 * @author Francesco Guardiani @slinkydeveloper
 */
public class RequestParameterImpl implements RequestParameter {

  private String name;
  private Object value;

  public RequestParameterImpl(String name, Object value) {
    this.name = name;
    this.value = value;
  }

  @Override
  public RequestParameter merge(RequestParameter mergingObj) {
    if (this.isArray() && mergingObj.isArray()) {
      mergingObj.getArray().addAll(this.getArray());
    } else if (this.isObject() && mergingObj.isObject()) {
      Map map = new HashMap<>();
      map.putAll(((Map) value));
      for (String key : mergingObj.getObjectKeys())
        map.put(key, mergingObj.getObjectValue(key));
      mergingObj.setValue(map);
    }
    return mergingObj;
  }

  public RequestParameterImpl(String name) {
    this(name, null);
  }

  public RequestParameterImpl() {
    this(null, null);
  }

  @Override
  public @Nullable String getName() {
    return name;
  }

  @Override
  public void setName(String name) {
    this.name = name;
  }

  @Override
  public void setValue(Object value) {
    this.value = value;
  }

  public Object getValue() { return this.value; }

  @Override
  public @Nullable List getObjectKeys() {
    return (isObject()) ? new ArrayList<>(((Map) value).keySet()) : null;
  }

  @Override
  public RequestParameter getObjectValue(String key) {
    return (isObject()) ? ((Map) value).get(key) : null;
  }

  @Override
  public boolean isObject() {
    return !isNull() && value instanceof Map;
  }

  @Override
  public @Nullable List getArray() {
    return (isArray()) ? ((List) value) : null;
  }

  @Override
  public boolean isArray() {
    return !isNull() && value instanceof List;
  }

  @Override
  public @Nullable String getString() {
    return (isString()) ? ((String) value) : null;
  }

  @Override
  public boolean isString() {
    return !isNull() && value instanceof String;
  }

  @Override
  public @Nullable Integer getInteger() {
    return (isInteger()) ? ((Integer) value) : null;
  }

  @Override
  public boolean isInteger() {
    return !isNull() && value instanceof Integer;
  }

  @Override
  public @Nullable Long getLong() {
    return (isLong()) ? ((Long) value) : null;
  }

  @Override
  public boolean isLong() {
    return !isNull() && value instanceof Long;
  }

  @Override
  public @Nullable Float getFloat() {
    return (isFloat()) ? ((Float) value) : null;
  }

  @Override
  public boolean isFloat() {
    return !isNull() && value instanceof Float;
  }

  @Override
  public @Nullable Double getDouble() {
    return (isDouble()) ? ((Double) value) : null;
  }

  @Override
  public boolean isDouble() {
    return !isNull() && value instanceof Double;
  }

  @Override
  public @Nullable Boolean getBoolean() {
    return (isBoolean()) ? ((Boolean) value) : null;
  }

  @Override
  public boolean isBoolean() {
    return !isNull() && value instanceof Boolean;
  }

  @Override
  public @Nullable JsonObject getJsonObject() {
    return (isJsonObject()) ? ((JsonObject) value) : null;
  }

  @Override
  public boolean isJsonObject() {
    return !isNull() && value instanceof JsonObject;
  }

  @Override
  public @Nullable JsonArray getJsonArray() {
    return (isJsonArray()) ? ((JsonArray) value) : null;
  }

  @Override
  public boolean isJsonArray() {
    return !isNull() && value instanceof JsonArray;
  }

  @Override
  public boolean isNull() {
    return value == null;
  }

  @Override
  public boolean isEmpty() {
    return isNull();
  }

  @Override
  public Object toJson() {
    if (isArray())
      return new JsonArray(getArray().stream().map(RequestParameter::toJson).collect(Collectors.toList()));
    else if (isObject())
      return ((Map) value)
        .entrySet()
        .stream()
        .collect(Collector.of(
            JsonObject::new,
            (j, e) -> j.put(e.getKey(), e.getValue().toJson()),
            JsonObject::mergeIn
          ));
    else
      return value;
  }

  @Override
  public String toString() {
    return value.toString();
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    RequestParameterImpl that = (RequestParameterImpl) o;
    return Objects.equals(name, that.name) &&
      Objects.equals(value, that.value);
  }

  @Override
  public int hashCode() {
    return Objects.hash(name, value);
  }
}