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/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jbpm.designer.client.shared;

import org.jbpm.designer.client.shared.Variable.VariableType;
import org.jbpm.designer.client.shared.util.StringUtils;

public class Assignment {

    private Variable variable;

    AssignmentData assignmentData;

    private static StringUtils stringUtils = new StringUtils();

    /*
        Assignments have either a processVar or a constant
     */
    private Variable processVar;
    private String constant;

    private static final String INPUT_ASSIGNMENT_PREFIX = "[din]";
    private static final String OUTPUT_ASSIGNMENT_PREFIX = "[dout]";
    private static final String ASSIGNMENT_OPERATOR_TOVARIABLE = "->";
    private static final String ASSIGNMENT_OPERATOR_TOCONSTANT = "=";

    public Assignment() {
    }

    public Assignment(AssignmentData assignmentData,
                      String variableName,
                      VariableType variableType,
                      String dataType,
                      String customDataType,
                      String processVarName,
                      String constant) {
        this.assignmentData = assignmentData;
        variable = assignmentData.findVariable(variableName,
                                               variableType);
        if (variable == null) {
            variable = new Variable(variableName,
                                    variableType,
                                    dataType,
                                    customDataType);
            assignmentData.addVariable(variable);
        }

        this.processVar = assignmentData.findProcessVariable(processVarName);
        this.constant = constant;
    }

    public Assignment(AssignmentData assignmentData,
                      String variableName,
                      VariableType variableType,
                      String processVarName,
                      String constant) {
        this.assignmentData = assignmentData;
        variable = assignmentData.findVariable(variableName,
                                               variableType);
        if (variable == null) {
            variable = new Variable(variableName,
                                    variableType);
            assignmentData.addVariable(variable);
        }

        processVar = assignmentData.findProcessVariable(processVarName);
        this.constant = constant;
    }

    public String getName() {
        return variable.getName();
    }

    public void setName(String name) {
        variable.setName(name);
    }

    public VariableType getVariableType() {
        return variable.getVariableType();
    }

    public void setVariableType(VariableType variableType) {
        variable.setVariableType(variableType);
    }

    public Variable getVariable() {
        return variable;
    }

    public String getDataType() {
        return variable.getDataType();
    }

    public void setDataType(String dataType) {
        variable.setDataType(dataType);
    }

    public String getCustomDataType() {
        return variable.getCustomDataType();
    }

    public void setCustomDataType(String customDataType) {
        variable.setCustomDataType(customDataType);
    }

    public String getProcessVarName() {
        return ((processVar != null) ? processVar.getName() : null);
    }

    public void setProcessVarName(String processVarName) {
        this.processVar = assignmentData.findProcessVariable(processVarName);
    }

    public String getConstant() {
        return constant;
    }

    public void setConstant(String constant) {
        this.constant = constant;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof Assignment)) {
            return false;
        }

        Assignment that = (Assignment) o;

        if (getVariable() != null ? !getVariable().equals(that.getVariable()) : that.getVariable() != null) {
            return false;
        }
        if (processVar != null ? !processVar.equals(that.processVar) : that.processVar != null) {
            return false;
        }
        return getConstant() != null ? getConstant().equals(that.getConstant()) : that.getConstant() == null;
    }

    @Override
    public int hashCode() {
        int result = getVariable() != null ? getVariable().hashCode() : 0;
        result = 31 * result + (processVar != null ? processVar.hashCode() : 0);
        result = 31 * result + (getConstant() != null ? getConstant().hashCode() : 0);
        return result;
    }

    /**
     * Serializes assignment
     * e.g. e.g. [din]str1->inStr, [din]inStrConst=TheString, [dout]outStr1->str1
     * @return
     */
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        if (getVariableType() == VariableType.INPUT) {
            if (getConstant() != null && !getConstant().isEmpty()) {
                sb.append(INPUT_ASSIGNMENT_PREFIX).append(getName()).append(ASSIGNMENT_OPERATOR_TOCONSTANT).append(
                        stringUtils.urlEncode(getConstant()));
            } else if (getProcessVarName() != null && !getProcessVarName().isEmpty()) {
                sb.append(INPUT_ASSIGNMENT_PREFIX).append(getProcessVarName()).append(ASSIGNMENT_OPERATOR_TOVARIABLE).append(getName());
            } else {
                sb.append(INPUT_ASSIGNMENT_PREFIX).append(ASSIGNMENT_OPERATOR_TOVARIABLE).append(getName());
            }
        } else {
            if (getProcessVarName() != null && !getProcessVarName().isEmpty()) {
                sb.append(OUTPUT_ASSIGNMENT_PREFIX).append(getName()).append(ASSIGNMENT_OPERATOR_TOVARIABLE).append(getProcessVarName());
            } else {
                sb.append(OUTPUT_ASSIGNMENT_PREFIX).append(getName()).append(ASSIGNMENT_OPERATOR_TOVARIABLE);
            }
        }
        return sb.toString();
    }

    /**
     * Deserializes an assignment string
     * e.g. [din]str1->inStr, [din]inStrConst=TheString, [dout]outStr1->str1
     * @param sAssignment
     * @return Assignment
     */
    public static Assignment deserialize(AssignmentData assignmentData,
                                         String sAssignment) {
        if (sAssignment == null || sAssignment.isEmpty()) {
            return null;
        }

        // Parse the assignment string
        VariableType assignmentType = null;
        if (sAssignment.startsWith(INPUT_ASSIGNMENT_PREFIX)) {
            assignmentType = VariableType.INPUT;
            sAssignment = sAssignment.substring(INPUT_ASSIGNMENT_PREFIX.length());
        } else if (sAssignment.startsWith(OUTPUT_ASSIGNMENT_PREFIX)) {
            assignmentType = VariableType.OUTPUT;
            sAssignment = sAssignment.substring(OUTPUT_ASSIGNMENT_PREFIX.length());
        }
        String variableName = null;
        String processVariableName = null;
        String constant = null;
        if (sAssignment.contains(ASSIGNMENT_OPERATOR_TOVARIABLE)) {
            int i = sAssignment.indexOf(ASSIGNMENT_OPERATOR_TOVARIABLE);
            if (assignmentType == VariableType.INPUT) {
                processVariableName = sAssignment.substring(0,
                                                            i);
                variableName = sAssignment.substring(i + ASSIGNMENT_OPERATOR_TOVARIABLE.length());
            } else {
                variableName = sAssignment.substring(0,
                                                     i);
                processVariableName = sAssignment.substring(i + ASSIGNMENT_OPERATOR_TOVARIABLE.length());
            }
        } else if (sAssignment.contains(ASSIGNMENT_OPERATOR_TOCONSTANT)) {
            int i = sAssignment.indexOf(ASSIGNMENT_OPERATOR_TOCONSTANT);
            variableName = sAssignment.substring(0,
                                                 i);
            constant = stringUtils.urlDecode(sAssignment.substring(i + ASSIGNMENT_OPERATOR_TOCONSTANT.length()));
        }

        // Create the new assignment
        return new Assignment(assignmentData,
                              variableName,
                              assignmentType,
                              processVariableName,
                              constant);
    }

    // for test purposes
    static void setStringUtils(StringUtils utils) {
        stringUtils = utils;
    }
}