package org.openecomp.sdc.toscaparser.api.elements;

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

import org.openecomp.sdc.toscaparser.api.common.ExceptionCollector;
import org.openecomp.sdc.toscaparser.api.utils.TOSCAVersionProperty;

public class PolicyType extends StatefulEntityType {
	
	private static final String DERIVED_FROM = "derived_from";
	private static final String METADATA = "metadata";
	private static final String PROPERTIES = "properties";
	private static final String VERSION = "version";
	private static final String DESCRIPTION = "description";
	private static final String TARGETS = "targets";
	private static final String TRIGGERS = "triggers";
	private static final String TYPE = "type";

	private static final String SECTIONS[] = {
			DERIVED_FROM, METADATA, PROPERTIES, VERSION, DESCRIPTION, TARGETS, TRIGGERS, TYPE
	};

	private LinkedHashMap<String,Object> customDef;
	private String policyDescription;
	private Object policyVersion;
	private LinkedHashMap<String,Object> properties;
	private LinkedHashMap<String,Object> parentPolicies;
	private LinkedHashMap<String,Object> metaData;
	private ArrayList<String> targetsList;
	
	
	public PolicyType(String _type, LinkedHashMap<String,Object> _customDef) {
		super(_type,POLICY_PREFIX,_customDef);
		
		type = _type;
		customDef = _customDef;
		_validateKeys();
		
        metaData = null;
        if(defs != null && defs.get(METADATA) != null) {
            metaData = (LinkedHashMap<String,Object>)defs.get(METADATA);
            _validateMetadata(metaData);
        }

        properties = null;
        if(defs != null && defs.get(PROPERTIES) != null) {
        	properties = (LinkedHashMap<String,Object>)defs.get(PROPERTIES);
        }
        parentPolicies = _getParentPolicies();

        policyVersion = null;
        if(defs != null && defs.get(VERSION) != null) {
            policyVersion = (new TOSCAVersionProperty(
                defs.get(VERSION))).getVersion();
        }

        policyDescription = null;
        if(defs != null && defs.get(DESCRIPTION) != null) {
        	policyDescription = (String)defs.get(DESCRIPTION);
        }
            
        targetsList = null;
        if(defs != null && defs.get(TARGETS) != null) {
        	targetsList = (ArrayList<String>)defs.get(TARGETS);
            _validateTargets(targetsList,customDef);
        }
		
	}

	private LinkedHashMap<String,Object> _getParentPolicies() {
		LinkedHashMap<String,Object> policies = new LinkedHashMap<>();
		String parentPolicy;
		if(getParentType() != null) {
			parentPolicy = getParentType().getType();
		}
		else {
			parentPolicy = null;
		}
		if(parentPolicy != null) {
			while(parentPolicy != null && !parentPolicy.equals("tosca.policies.Root")) {
				policies.put(parentPolicy, TOSCA_DEF.get(parentPolicy));
				parentPolicy = (String)
					((LinkedHashMap<String,Object>)policies.get(parentPolicy)).get("derived_from);");
			}
		}
		return policies;
	}

	public String getType() {
		return type;
	}

	public PolicyType getParentType() {
        // Return a policy statefulentity of this node is derived from
		if(defs == null) {
			return null;
		}
        String ppolicyEntity = derivedFrom(defs);
        if(ppolicyEntity != null) {
            return new PolicyType(ppolicyEntity,customDef);
        }
        return null;
	}
	
	public Object getPolicy(String name) {
        // Return the definition of a policy field by name
        if(defs != null &&  defs.get(name) != null) {
            return defs.get(name);
        }
        return null;
	}

	public ArrayList<String> getTargets() {
        // Return targets
        return targetsList;
	}
	
	public String getDescription() {
		return policyDescription;
	}

	public Object getVersion() {
		return policyVersion;
	}
	
	private void _validateKeys() {
		for(String key: defs.keySet()) {
			boolean bFound = false;
			for(String sect: SECTIONS) {
				if(key.equals(sect)) {
					bFound = true;
					break;
				}
			}
			if(!bFound) {
                ExceptionCollector.appendException(String.format(
                    "UnknownFieldError: Policy \"%s\" contains unknown field \"%s\"",
                    type,key));
			}
		}
	}
	
	private void _validateTargets(ArrayList<String> _targetsList,
								  LinkedHashMap<String,Object> _customDef) {
		for(String nodetype: _targetsList) {
			if(_customDef.get(nodetype) == null) {
                ExceptionCollector.appendException(String.format(
                    "InvalidTypeError: \"%s\" defined in targets for policy \"%s\"",
                    nodetype,type));
				
			}
		}
	}
 
	private void _validateMetadata(LinkedHashMap<String,Object> _metaData) {
		String mtype = (String)_metaData.get("type");
		if(mtype != null && !mtype.equals("map") && !mtype.equals("tosca:map")) {
            ExceptionCollector.appendException(String.format(
                "InvalidTypeError: \"%s\" defined in policy for metadata",
                mtype));
		}
		for(String entrySchema: metaData.keySet()) {
			Object estob = metaData.get(entrySchema);
			if(estob instanceof LinkedHashMap) {
				String est = (String)
						((LinkedHashMap<String,Object>)estob).get("type");
				if(!est.equals("string")) {
	                ExceptionCollector.appendException(String.format(
	                    "InvalidTypeError: \"%s\" defined in policy for metadata \"%s\"",
	                    est,entrySchema));
				}
			}
		}
	}

}

/*python

from toscaparser.common.exception import ExceptionCollector
from toscaparser.common.exception import InvalidTypeError
from toscaparser.common.exception import UnknownFieldError
from toscaparser.elements.statefulentitytype import StatefulEntityType
from toscaparser.utils.validateutils import TOSCAVersionProperty


class PolicyType(StatefulEntityType):

    '''TOSCA built-in policies type.'''
    SECTIONS = (DERIVED_FROM, METADATA, PROPERTIES, VERSION, DESCRIPTION, TARGETS) = \
               ('derived_from', 'metadata', 'properties', 'version',
                'description', 'targets')

    def __init__(self, ptype, custom_def=None):
        super(PolicyType, self).__init__(ptype, self.POLICY_PREFIX,
                                         custom_def)
        self.type = ptype
        self.custom_def = custom_def
        self._validate_keys()

        self.meta_data = None
        if self.METADATA in self.defs:
            self.meta_data = self.defs[self.METADATA]
            self._validate_metadata(self.meta_data)

        self.properties = None
        if self.PROPERTIES in self.defs:
            self.properties = self.defs[self.PROPERTIES]
        self.parent_policies = self._get_parent_policies()

        self.policy_version = None
        if self.VERSION in self.defs:
            self.policy_version = TOSCAVersionProperty(
                self.defs[self.VERSION]).get_version()

        self.policy_description = self.defs[self.DESCRIPTION] \
            if self.DESCRIPTION in self.defs else None

        self.targets_list = None
        if self.TARGETS in self.defs:
            self.targets_list = self.defs[self.TARGETS]
            self._validate_targets(self.targets_list, custom_def)

    def _get_parent_policies(self):
        policies = {}
        parent_policy = self.parent_type.type if self.parent_type else None
        if parent_policy:
            while parent_policy != 'tosca.policies.Root':
                policies[parent_policy] = self.TOSCA_DEF[parent_policy]
                parent_policy = policies[parent_policy]['derived_from']
        return policies

    @property
    def parent_type(self):
        '''Return a policy statefulentity of this node is derived from.'''
        if not hasattr(self, 'defs'):
            return None
        ppolicy_entity = self.derived_from(self.defs)
        if ppolicy_entity:
            return PolicyType(ppolicy_entity, self.custom_def)

    def get_policy(self, name):
        '''Return the definition of a policy field by name.'''
        if name in self.defs:
            return self.defs[name]

    @property
    def targets(self):
        '''Return targets.'''
        return self.targets_list

    @property
    def description(self):
        return self.policy_description

    @property
    def version(self):
        return self.policy_version

    def _validate_keys(self):
        for key in self.defs.keys():
            if key not in self.SECTIONS:
                ExceptionCollector.appendException(
                    UnknownFieldError(what='Policy "%s"' % self.type,
                                      field=key))

    def _validate_targets(self, targets_list, custom_def):
        for nodetype in targets_list:
            if nodetype not in custom_def:
                ExceptionCollector.appendException(
                    InvalidTypeError(what='"%s" defined in targets for '
                                     'policy "%s"' % (nodetype, self.type)))

    def _validate_metadata(self, meta_data):
        if not meta_data.get('type') in ['map', 'tosca:map']:
            ExceptionCollector.appendException(
                InvalidTypeError(what='"%s" defined in policy for '
                                 'metadata' % (meta_data.get('type'))))

        for entry_schema, entry_schema_type in meta_data.items():
            if isinstance(entry_schema_type, dict) and not \
                    entry_schema_type.get('type') == 'string':
                ExceptionCollector.appendException(
                    InvalidTypeError(what='"%s" defined in policy for '
                                     'metadata "%s"'
                                     % (entry_schema_type.get('type'),
                                        entry_schema)))
*/