/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.programrule.engine;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.HashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import lombok.extern.slf4j.Slf4j;
import org.hisp.dhis.program.Enrollment;
import org.hisp.dhis.program.Event;
import org.hisp.dhis.rules.models.RuleAction;
import org.hisp.dhis.rules.models.RuleActionAssign;
import org.hisp.dhis.rules.models.RuleEffect;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;

/**
 * @author Zubair Asghar
 */
@Slf4j
@Component("org.hisp.dhis.programrule.engine.RuleActionAssignValueImplementer")
@Transactional
public class RuleActionAssignValueImplementer implements RuleActionImplementer {
  private static final String REGEX = "[a-zA-Z0-9]+(?:[\\w -._]*[a-zA-Z0-9]+)*+";

  private static final Pattern PATTERN = Pattern.compile(REGEX, Pattern.CASE_INSENSITIVE);

  private RuleVariableInMemoryMap variableMap;

  public RuleActionAssignValueImplementer(RuleVariableInMemoryMap variableMap) {
    checkNotNull(variableMap);

    this.variableMap = variableMap;
  }

  @Override
  public boolean accept(RuleAction ruleAction) {
    return ruleAction instanceof RuleActionAssign;
  }

  @Override
  public void implement(RuleEffect ruleEffect, Enrollment enrollment) {
    checkNotNull(ruleEffect, "Rule Effect cannot be null");
    checkNotNull(enrollment, "Enrollment cannot be null");

    assignValue(ruleEffect, enrollment);
  }

  @Override
  public void implement(RuleEffect ruleEffect, Event event) {
    assignValue(ruleEffect, event.getEnrollment());
  }

  private void assignValue(RuleEffect ruleEffect, Enrollment enrollment) {
    if (enrollment == null) {
      log.info("No value assigned by AssignValue action");
      return;
    }

    String value = ruleEffect.data();

    RuleActionAssign assign = (RuleActionAssign) ruleEffect.ruleAction();

    String variable = assign.field();

    Matcher matcher = PATTERN.matcher(variable);

    while (matcher.find()) {
      variable = matcher.group(0).trim();
    }

    log.debug("Assigning: " + variable + " with value: " + value);

    if (!variableMap.containsKey(enrollment.getUid())) {
      variableMap.put(enrollment.getUid(), new HashMap<>());
    }

    variableMap.get(enrollment.getUid()).put(variable, value);
  }
}
