/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.sdc.toscaparser.api.elements.constraints;

import org.onap.sdc.toscaparser.api.common.JToscaValidationIssue;
import org.onap.sdc.toscaparser.api.elements.ScalarUnit;
import org.onap.sdc.toscaparser.api.functions.Function;
import org.onap.sdc.toscaparser.api.utils.ThreadLocalsHolder;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;

public abstract class Constraint {

    // Parent class for constraints for a Property or Input

    protected static final String EQUAL = "equal";
    protected static final String GREATER_THAN = "greater_than";
    protected static final String GREATER_OR_EQUAL = "greater_or_equal";
    protected static final String LESS_THAN = "less_than";
    protected static final String LESS_OR_EQUAL = "less_or_equal";
    protected static final String IN_RANGE = "in_range";
    protected static final String VALID_VALUES = "valid_values";
    protected static final String LENGTH = "length";
    protected static final String MIN_LENGTH = "min_length";
    protected static final String MAX_LENGTH = "max_length";
    protected static final String PATTERN = "pattern";

    protected static final String[] CONSTRAINTS = {
            EQUAL, GREATER_THAN, GREATER_OR_EQUAL, LESS_THAN, LESS_OR_EQUAL,
            IN_RANGE, VALID_VALUES, LENGTH, MIN_LENGTH, MAX_LENGTH, PATTERN};

    @SuppressWarnings("unchecked")
    public static Constraint factory(String constraintClass, String propname, String proptype, Object constraint) {

        // a factory for the different Constraint classes
        // replaces Python's __new__() usage

        if (!(constraint instanceof LinkedHashMap)
                || ((LinkedHashMap<String, Object>) constraint).size() != 1) {
            ThreadLocalsHolder.getCollector().appendValidationIssue(new JToscaValidationIssue("JE101",
                    "InvalidSchemaError: Invalid constraint schema " + constraint.toString()));
        }

        switch (constraintClass) {
            case EQUAL:
                return new Equal(propname, proptype, constraint);
            case GREATER_THAN:
                return new GreaterThan(propname, proptype, constraint);
            case GREATER_OR_EQUAL:
                return new GreaterOrEqual(propname, proptype, constraint);
            case LESS_THAN:
                return new LessThan(propname, proptype, constraint);
            case LESS_OR_EQUAL:
                return new LessOrEqual(propname, proptype, constraint);
            case IN_RANGE:
                return new InRange(propname, proptype, constraint);
            case VALID_VALUES:
                return new ValidValues(propname, proptype, constraint);
            case LENGTH:
                return new Length(propname, proptype, constraint);
            case MIN_LENGTH:
                return new MinLength(propname, proptype, constraint);
            case MAX_LENGTH:
                return new MaxLength(propname, proptype, constraint);
            case PATTERN:
                return new Pattern(propname, proptype, constraint);
            default:
                ThreadLocalsHolder.getCollector().appendValidationIssue(new JToscaValidationIssue("JE102", String.format(
                        "InvalidSchemaError: Invalid property \"%s\"", constraintClass)));
                return null;
        }
    }

    private String constraintKey = "TBD";
    protected ArrayList<String> validTypes = new ArrayList<>();
    protected ArrayList<String> validPropTypes = new ArrayList<>();

    protected String propertyName;
    private String propertyType;
    protected Object constraintValue;
    protected Object constraintValueMsg;
    protected Object valueMsg;

    @SuppressWarnings("unchecked")
    public Constraint(String propname, String proptype, Object constraint) {

        setValues();

        propertyName = propname;
        propertyType = proptype;
        constraintValue = ((LinkedHashMap<String, Object>) constraint).get(constraintKey);
        constraintValueMsg = constraintValue;
        boolean bFound = false;
        for (String s : ScalarUnit.SCALAR_UNIT_TYPES) {
            if (s.equals(propertyType)) {
                bFound = true;
                break;
            }
        }
        if (bFound) {
            constraintValue = _getScalarUnitConstraintValue();
        }
        // check if constraint is valid for property type
        bFound = false;
        for (String s : validPropTypes) {
            if (s.equals(propertyType)) {
                bFound = true;
                break;
            }
        }
        if (!bFound) {
            ThreadLocalsHolder.getCollector().appendValidationIssue(new JToscaValidationIssue("JE103", String.format(
                    "InvalidSchemaError: Property \"%s\" is not valid for data type \"%s\"",
                    constraintKey, propertyType)));
        }
    }

    public ArrayList<String> getValidTypes() {
        return validTypes;
    }

    public void addValidTypes(List<String> validTypes) {
        this.validTypes.addAll(validTypes);
    }

    public ArrayList<String> getValidPropTypes() {
        return validPropTypes;
    }

    public String getPropertyType() {
        return propertyType;
    }

    public Object getConstraintValue() {
        return constraintValue;
    }

    public Object getConstraintValueMsg() {
        return constraintValueMsg;
    }

    public Object getValueMsg() {
        return valueMsg;
    }

    public void setConstraintKey(String constraintKey) {
        this.constraintKey = constraintKey;
    }

    public void setValidTypes(ArrayList<String> validTypes) {
        this.validTypes = validTypes;
    }

    public void setValidPropTypes(ArrayList<String> validPropTypes) {
        this.validPropTypes = validPropTypes;
    }

    public void setPropertyType(String propertyType) {
        this.propertyType = propertyType;
    }

    public void setConstraintValue(Object constraintValue) {
        this.constraintValue = constraintValue;
    }

    public void setConstraintValueMsg(Object constraintValueMsg) {
        this.constraintValueMsg = constraintValueMsg;
    }

    public void setValueMsg(Object valueMsg) {
        this.valueMsg = valueMsg;
    }

    @SuppressWarnings("unchecked")
    private Object _getScalarUnitConstraintValue() {
        // code differs from Python because of class creation
        if (constraintValue instanceof ArrayList) {
            ArrayList<Object> ret = new ArrayList<>();
            for (Object v : (ArrayList<Object>) constraintValue) {
                ScalarUnit su = ScalarUnit.getScalarunitClass(propertyType, v);
                ret.add(su.getNumFromScalarUnit(null));
            }
            return ret;
        } else {
            ScalarUnit su = ScalarUnit.getScalarunitClass(propertyType, constraintValue);
            return su.getNumFromScalarUnit(null);
        }
    }

    public void validate(Object value) {
        if (Function.isFunction(value)) {
            //skipping constraints check for functions
            return;
        }

        valueMsg = value;
        boolean bFound = false;
        for (String s : ScalarUnit.SCALAR_UNIT_TYPES) {
            if (s.equals(propertyType)) {
                bFound = true;
                break;
            }
        }
        if (bFound) {
            value = ScalarUnit.getScalarunitValue(propertyType, value, null);
        }
        if (!isValid(value)) {
            ThreadLocalsHolder.getCollector().appendValidationIssue(new JToscaValidationIssue("JE008", "ValidationError: " + errMsg(value)));
        }
    }

    protected abstract boolean isValid(Object value);

    protected abstract void setValues();

    protected abstract String errMsg(Object value);

}

/*python

class Constraint(object):
    '''Parent class for constraints for a Property or Input.'''

    CONSTRAINTS = (EQUAL, GREATER_THAN,
                   GREATER_OR_EQUAL, LESS_THAN, LESS_OR_EQUAL, IN_RANGE,
                   VALID_VALUES, LENGTH, MIN_LENGTH, MAX_LENGTH, PATTERN) = \
                  ('equal', 'greater_than', 'greater_or_equal', 'less_than',
                   'less_or_equal', 'in_range', 'valid_values', 'length',
                   'min_length', 'max_length', 'pattern')

    def __new__(cls, property_name, property_type, constraint):
        if cls is not Constraint:
            return super(Constraint, cls).__new__(cls)

        if(not isinstance(constraint, collections.Mapping) or
           len(constraint) != 1):
            ValidationIssueCollector.appendException(
                InvalidSchemaError(message=_('Invalid constraint schema.')))

        for type in constraint.keys():
            ConstraintClass = get_constraint_class(type)
            if not ConstraintClass:
                msg = _('Invalid property "%s".') % type
                ValidationIssueCollector.appendException(
                    InvalidSchemaError(message=msg))

        return ConstraintClass(property_name, property_type, constraint)

    def __init__(self, property_name, property_type, constraint):
        self.property_name = property_name
        self.property_type = property_type
        self.constraint_value = constraint[self.constraint_key]
        self.constraint_value_msg = self.constraint_value
        if self.property_type in scalarunit.ScalarUnit.SCALAR_UNIT_TYPES:
            self.constraint_value = self._get_scalarunit_constraint_value()
        # check if constraint is valid for property type
        if property_type not in self.valid_prop_types:
            msg = _('Property "%(ctype)s" is not valid for data type '
                    '"%(dtype)s".') % dict(
                        ctype=self.constraint_key,
                        dtype=property_type)
            ValidationIssueCollector.appendException(InvalidSchemaError(message=msg))

    def _get_scalarunit_constraint_value(self):
        if self.property_type in scalarunit.ScalarUnit.SCALAR_UNIT_TYPES:
            ScalarUnit_Class = (scalarunit.
                                get_scalarunit_class(self.property_type))
        if isinstance(self.constraint_value, list):
            return [ScalarUnit_Class(v).get_num_from_scalar_unit()
                    for v in self.constraint_value]
        else:
            return (ScalarUnit_Class(self.constraint_value).
                    get_num_from_scalar_unit())

    def _err_msg(self, value):
        return _('Property "%s" could not be validated.') % self.property_name

    def validate(self, value):
        self.value_msg = value
        if self.property_type in scalarunit.ScalarUnit.SCALAR_UNIT_TYPES:
            value = scalarunit.get_scalarunit_value(self.property_type, value)
        if not self._is_valid(value):
            err_msg = self._err_msg(value)
            ValidationIssueCollector.appendException(
                ValidationError(message=err_msg))


*/