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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH under
 * one or more contributor license agreements. See the NOTICE file distributed
 * with this work for additional information regarding copyright ownership.
 * Licensed under the Camunda License 1.0. You may not use this file
 * except in compliance with the Camunda License 1.0.
 */
package io.camunda.operate.webapp.rest.validation;

import static io.camunda.operate.webapp.rest.dto.operation.ModifyProcessInstanceRequestDto.Modification;

import io.camunda.operate.util.CollectionUtil;
import io.camunda.operate.webapp.elasticsearch.reader.ProcessInstanceReader;
import io.camunda.operate.webapp.rest.dto.operation.ModifyProcessInstanceRequestDto;
import io.camunda.operate.webapp.rest.exception.InvalidRequestException;
import org.apache.commons.collections4.MapUtils;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

@Component
public class ModifyProcessInstanceRequestValidator {

  private final ProcessInstanceReader processInstanceReader;

  public ModifyProcessInstanceRequestValidator(final ProcessInstanceReader processInstanceReader) {
    this.processInstanceReader = processInstanceReader;
  }

  public void validate(final ModifyProcessInstanceRequestDto modifyRequest) {
    final Long processInstanceKey = Long.parseLong(modifyRequest.getProcessInstanceKey());
    if (processInstanceReader.getProcessInstanceByKey(processInstanceKey) == null) {
      throw new InvalidRequestException(
          String.format("Process instance with key %s does not exist", processInstanceKey));
    }
    if (!CollectionUtil.isNotEmpty(modifyRequest.getModifications())) {
      throw new InvalidRequestException(
          String.format(
              "No modifications given for process instance with key %s", processInstanceKey));
    }
    modifyRequest
        .getModifications()
        .forEach(
            modification -> {
              final ModifyProcessInstanceRequestDto.Modification.Type type =
                  modification.getModification();
              if (type == ModifyProcessInstanceRequestDto.Modification.Type.ADD_TOKEN) {
                validateAddToken(modification, processInstanceKey);
              } else if (type == ModifyProcessInstanceRequestDto.Modification.Type.CANCEL_TOKEN) {
                validateCancelToken(modification, processInstanceKey);
              } else if (type == ModifyProcessInstanceRequestDto.Modification.Type.MOVE_TOKEN) {
                validateMoveToken(modification, processInstanceKey);
              } else if (type == ModifyProcessInstanceRequestDto.Modification.Type.ADD_VARIABLE
                  || type == ModifyProcessInstanceRequestDto.Modification.Type.EDIT_VARIABLE) {
                validateAddEditVariable(modification, processInstanceKey);
              } else {
                throw new InvalidRequestException(
                    String.format(
                        "Unknown Modification.Type given for process instance with key %s.",
                        processInstanceKey));
              }
            });
  }

  private void validateAddEditVariable(
      final Modification modification, final Long processInstanceKey) {
    if (!MapUtils.isNotEmpty(modification.getVariables())) {
      throw new InvalidRequestException(
          String.format("No variables given for process instance with key %s", processInstanceKey));
    }
  }

  private void validateMoveToken(final Modification modification, final Long processInstanceKey) {
    validateAddToken(modification, processInstanceKey);
    validateCancelToken(modification, processInstanceKey);
  }

  private void validateCancelToken(final Modification modification, final Long processInstanceKey) {
    if (!StringUtils.hasText(modification.getFromFlowNodeId())
        && !StringUtils.hasText(modification.getFromFlowNodeInstanceKey())) {
      throw new InvalidRequestException(
          String.format(
              "Neither fromFlowNodeId nor fromFlowNodeInstanceKey is given for process instance with key %s",
              processInstanceKey));
    }
    if (StringUtils.hasText(modification.getFromFlowNodeId())
        && StringUtils.hasText(modification.getFromFlowNodeInstanceKey())) {
      throw new InvalidRequestException(
          String.format(
              "Either fromFlowNodeId or fromFlowNodeInstanceKey for process instance with key %s should be given, not both.",
              processInstanceKey));
    }
    if (modification.getFromFlowNodeInstanceKey() != null) {
      try {
        Long.parseLong(modification.getFromFlowNodeInstanceKey());
      } catch (final NumberFormatException nfe) {
        throw new InvalidRequestException("fromFlowNodeInstanceKey should be a Long.");
      }
    }
  }

  private void validateAddToken(final Modification modification, final Long processInstanceKey) {
    if (modification.getToFlowNodeId() == null) {
      throw new InvalidRequestException(
          String.format(
              "No toFlowNodeId given for process instance with key %s", processInstanceKey));
    }
  }
}