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

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.Map;

import org.openecomp.sdc.toscaparser.api.extensions.ExtTools;
import org.openecomp.sdc.toscaparser.api.utils.CopyUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.yaml.snakeyaml.Yaml;

public class EntityType {

	private static Logger log = LoggerFactory.getLogger(EntityType.class.getName());

	private static final String TOSCA_DEFINITION_1_0_YAML = "TOSCA_definition_1_0.yaml";
	protected static final String DERIVED_FROM = "derived_from";
	protected static final String PROPERTIES = "properties";
	protected static final String ATTRIBUTES = "attributes";
	protected static final String REQUIREMENTS = "requirements";
	protected static final String INTERFACES = "interfaces";
	protected static final String CAPABILITIES = "capabilities";
	protected static final String TYPE = "type";
	protected static final String ARTIFACTS = "artifacts";
	
	@SuppressWarnings("unused")
	private static final String SECTIONS[] = {
			DERIVED_FROM, PROPERTIES, ATTRIBUTES, REQUIREMENTS,
            INTERFACES, CAPABILITIES, TYPE, ARTIFACTS
	};

	public static final String  TOSCA_DEF_SECTIONS[] = {
			"node_types", "data_types", "artifact_types",
	        "group_types", "relationship_types",
             "capability_types", "interface_types",
             "policy_types"};


    // TOSCA definition file
	//private final static String path = EntityType.class.getProtectionDomain().getCodeSource().getLocation().getPath();
	
	//private final static String path =  EntityType.class.getClassLoader().getResource("TOSCA_definition_1_0.yaml").getFile();
    //private final static String TOSCA_DEF_FILE = EntityType.class.getClassLoader().getResourceAsStream("TOSCA_definition_1_0.yaml");
    
	private static LinkedHashMap<String,Object> TOSCA_DEF_LOAD_AS_IS = loadTdf();
	
	//EntityType.class.getClassLoader().getResourceAsStream("TOSCA_definition_1_0.yaml");

	@SuppressWarnings("unchecked")
	private static LinkedHashMap<String,Object> loadTdf() {
		String toscaDefLocation = EntityType.class.getClassLoader().getResource(TOSCA_DEFINITION_1_0_YAML).getFile();
		InputStream input = EntityType.class.getClassLoader().getResourceAsStream(TOSCA_DEFINITION_1_0_YAML);
		if (input == null){
			log.error("EntityType - loadTdf - Couldn't load TOSCA_DEF_FILE {}", toscaDefLocation);
		}
		Yaml yaml = new Yaml();
		Object loaded = yaml.load(input);
	    //@SuppressWarnings("unchecked")
	    return (LinkedHashMap<String,Object>) loaded;
	}

    // Map of definition with pre-loaded values of TOSCA_DEF_FILE_SECTIONS
	public static LinkedHashMap<String,Object> TOSCA_DEF;
	static {
    	TOSCA_DEF = new LinkedHashMap<String,Object>();
        for(String section: TOSCA_DEF_SECTIONS) {
        	@SuppressWarnings("unchecked")
    		LinkedHashMap<String,Object> value = (LinkedHashMap<String,Object>)TOSCA_DEF_LOAD_AS_IS.get(section); 
        	if(value != null) {
        		for(String key: value.keySet()) {
        			TOSCA_DEF.put(key, value.get(key));
        		}
        	}
        }
	}

	public static final String DEPENDSON = "tosca.relationships.DependsOn";
	public static final String HOSTEDON = "tosca.relationships.HostedOn";
	public static final String CONNECTSTO = "tosca.relationships.ConnectsTo";
	public static final String ATTACHESTO = "tosca.relationships.AttachesTo";
	public static final String LINKSTO = "tosca.relationships.network.LinksTo";
	public static final String BINDSTO = "tosca.relationships.network.BindsTo";

    public static final String RELATIONSHIP_TYPE[] = { 
		"tosca.relationships.DependsOn",
		"tosca.relationships.HostedOn",
		"tosca.relationships.ConnectsTo",
		"tosca.relationships.AttachesTo",
		"tosca.relationships.network.LinksTo",
		"tosca.relationships.network.BindsTo"};

	public static final String NODE_PREFIX = "tosca.nodes.";
	public static final String RELATIONSHIP_PREFIX = "tosca.relationships.";
	public static final String CAPABILITY_PREFIX = "tosca.capabilities.";
	public static final String INTERFACE_PREFIX = "tosca.interfaces.";
	public static final String ARTIFACT_PREFIX = "tosca.artifacts.";
	public static final String POLICY_PREFIX = "tosca.policies.";
	public static final String GROUP_PREFIX = "tosca.groups.";
	//currently the data types are defined only for network
	// but may have changes in the future.
	public static final String DATATYPE_PREFIX = "tosca.datatypes.";
	public static final String DATATYPE_NETWORK_PREFIX = DATATYPE_PREFIX + "network.";
	public static final String TOSCA = "tosca";

	protected String type;
	protected LinkedHashMap<String,Object> defs = null;
	public Object getParentType() { return null; }
	
    public String derivedFrom(LinkedHashMap<String,Object> defs) {
        // Return a type this type is derived from
        return (String)entityValue(defs, "derived_from");
    }

    public boolean isDerivedFrom(String type_str) {
        // Check if object inherits from the given type
        // Returns true if this object is derived from 'type_str'
        // False otherwise.
        if(type == null || this.type.isEmpty()) {
            return false;
        }
        else if(type == type_str) {
            return true;
        }
        else if(getParentType() != null) {
            return ((EntityType)getParentType()).isDerivedFrom(type_str);
        }
        else {
            return false;
        }
    }

    public Object entityValue(LinkedHashMap<String,Object> defs, String key) {
    	if(defs != null) {
    		return defs.get(key);
    	}
    	return null;
    }

    @SuppressWarnings("unchecked")
	public Object getValue(String ndtype, LinkedHashMap<String,Object> _defs, boolean parent) {
        Object value = null;
        if(_defs == null) {
            if(defs == null) {
                return null;
            }
            _defs = this.defs;
        }
        Object defndt = _defs.get(ndtype); 
        if(defndt != null) {
            // copy the value to avoid that next operations add items in the
            // item definitions
            //value = copy.copy(defs[ndtype])
        	value = CopyUtils.copyLhmOrAl(defndt);
        }
        
        if(parent) {
            EntityType p = this;
            if(p != null) {
                while(p != null) {
                	if(p.defs != null && p.defs.get(ndtype) != null) {
                        // get the parent value
                        Object parentValue = p.defs.get(ndtype);
                        if(value != null) {
                            if(value instanceof LinkedHashMap) {
                            	for(Map.Entry<String,Object> me: ((LinkedHashMap<String,Object>)parentValue).entrySet()) {
                            		String k = me.getKey();
                            		if(((LinkedHashMap<String,Object>)value).get(k) == null) {
                            			((LinkedHashMap<String,Object>)value).put(k,me.getValue());
                            		}
                            	}
                            }
                            if(value instanceof ArrayList) {
                            	for(Object pValue: (ArrayList<Object>)parentValue) {
                            		if(!((ArrayList<Object>)value).contains(pValue)) {
                            			((ArrayList<Object>)value).add(pValue);
                            		}
                            	}
                            }
                        }
                        else {
                        	// value = copy.copy(parent_value)
                            value = CopyUtils.copyLhmOrAl(parentValue);
                        }
                	}
                    p = (EntityType)p.getParentType();
                }
            }
        }
              		
    	return value;
	}

    @SuppressWarnings("unchecked")
	public Object getDefinition(String ndtype) {
        Object value = null;
        LinkedHashMap<String,Object> _defs;
        // no point in hasattr, because we have it, and it 
        // doesn't do anything except emit an exception anyway
        //if not hasattr(self, 'defs'):
        //    defs = None
        //    ExceptionCollector.appendException(
        //        ValidationError(message="defs is " + str(defs)))
        //else:
        //    defs = self.defs       	
        _defs = this.defs;
        

        if(_defs != null && _defs.get(ndtype) != null) {
        	value = _defs.get(ndtype);
        }

        Object p = getParentType();
        if(p != null) {
        	Object inherited = ((EntityType)p).getDefinition(ndtype);
        	if(inherited != null) {
                // inherited = dict(inherited) WTF?!?
        		if(value == null) {
        			value = inherited;
        		}
        		else {
        			//?????
                    //inherited.update(value)
                    //value.update(inherited)
        			for(Map.Entry<String,Object> me: ((LinkedHashMap<String,Object>)inherited).entrySet()) {
        				((LinkedHashMap<String,Object>)value).put(me.getKey(),me.getValue());
        			}
        		}
        	}
        }
        return value;
    }
    
   public static void updateDefinitions(String version) {
        ExtTools exttools = new ExtTools();
        String extensionDefsFile = exttools.getDefsFile(version);
        
		InputStream input = null;
		try {
			input = new FileInputStream(new File(extensionDefsFile));
		} 
		catch (FileNotFoundException e) {
			log.error("EntityType - updateDefinitions - Failed to open extension defs file ", extensionDefsFile);
			return;		
		}
		Yaml yaml = new Yaml();
		LinkedHashMap<String,Object> nfvDefFile = (LinkedHashMap<String,Object>)yaml.load(input);
		LinkedHashMap<String,Object> nfvDef = new LinkedHashMap<>();
		for(String section: TOSCA_DEF_SECTIONS) {
			if(nfvDefFile.get(section) != null) {
				LinkedHashMap<String,Object> value = 
						(LinkedHashMap<String,Object>)nfvDefFile.get(section);
				for(String key: value.keySet()) {
					nfvDef.put(key, value.get(key));
				}
			}
		}
		TOSCA_DEF.putAll(nfvDef);
    }
    
}

/*python

from toscaparser.common.exception import ExceptionCollector
from toscaparser.common.exception import ValidationError
from toscaparser.extensions.exttools import ExtTools
import org.openecomp.sdc.toscaparser.api.utils.yamlparser

log = logging.getLogger('tosca')


class EntityType(object):
    '''Base class for TOSCA elements.'''

    SECTIONS = (DERIVED_FROM, PROPERTIES, ATTRIBUTES, REQUIREMENTS,
                INTERFACES, CAPABILITIES, TYPE, ARTIFACTS) = \
               ('derived_from', 'properties', 'attributes', 'requirements',
                'interfaces', 'capabilities', 'type', 'artifacts')

    TOSCA_DEF_SECTIONS = ['node_types', 'data_types', 'artifact_types',
                          'group_types', 'relationship_types',
                          'capability_types', 'interface_types',
                          'policy_types']

    '''TOSCA definition file.'''
    TOSCA_DEF_FILE = os.path.join(
        os.path.dirname(os.path.abspath(__file__)),
        "TOSCA_definition_1_0.yaml")

    loader = toscaparser.utils.yamlparser.load_yaml

    TOSCA_DEF_LOAD_AS_IS = loader(TOSCA_DEF_FILE)

    # Map of definition with pre-loaded values of TOSCA_DEF_FILE_SECTIONS
    TOSCA_DEF = {}
    for section in TOSCA_DEF_SECTIONS:
        if section in TOSCA_DEF_LOAD_AS_IS.keys():
            value = TOSCA_DEF_LOAD_AS_IS[section]
            for key in value.keys():
                TOSCA_DEF[key] = value[key]

    RELATIONSHIP_TYPE = (DEPENDSON, HOSTEDON, CONNECTSTO, ATTACHESTO,
                         LINKSTO, BINDSTO) = \
                        ('tosca.relationships.DependsOn',
                         'tosca.relationships.HostedOn',
                         'tosca.relationships.ConnectsTo',
                         'tosca.relationships.AttachesTo',
                         'tosca.relationships.network.LinksTo',
                         'tosca.relationships.network.BindsTo')

    NODE_PREFIX = 'tosca.nodes.'
    RELATIONSHIP_PREFIX = 'tosca.relationships.'
    CAPABILITY_PREFIX = 'tosca.capabilities.'
    INTERFACE_PREFIX = 'tosca.interfaces.'
    ARTIFACT_PREFIX = 'tosca.artifacts.'
    POLICY_PREFIX = 'tosca.policies.'
    GROUP_PREFIX = 'tosca.groups.'
    # currently the data types are defined only for network
    # but may have changes in the future.
    DATATYPE_PREFIX = 'tosca.datatypes.'
    DATATYPE_NETWORK_PREFIX = DATATYPE_PREFIX + 'network.'
    TOSCA = 'tosca'

    def derived_from(self, defs):
        '''Return a type this type is derived from.'''
        return self.entity_value(defs, 'derived_from')

    def is_derived_from(self, type_str):
        '''Check if object inherits from the given type.

        Returns true if this object is derived from 'type_str'.
        False otherwise.
        '''
        if not self.type:
            return False
        elif self.type == type_str:
            return True
        elif self.parent_type:
            return self.parent_type.is_derived_from(type_str)
        else:
            return False

    def entity_value(self, defs, key):
        if key in defs:
            return defs[key]

    def get_value(self, ndtype, defs=None, parent=None):
        value = None
        if defs is None:
            if not hasattr(self, 'defs'):
                return None
            defs = self.defs
        if ndtype in defs:
            # copy the value to avoid that next operations add items in the
            # item definitions
            value = copy.copy(defs[ndtype])
        if parent:
            p = self
            if p:
                while p:
                    if ndtype in p.defs:
                        # get the parent value
                        parent_value = p.defs[ndtype]
                        if value:
                            if isinstance(value, dict):
                                for k, v in parent_value.items():
                                    if k not in value.keys():
                                        value[k] = v
                            if isinstance(value, list):
                                for p_value in parent_value:
                                    if p_value not in value:
                                        value.append(p_value)
                        else:
                            value = copy.copy(parent_value)
                    p = p.parent_type
        return value

    def get_definition(self, ndtype):
        value = None
        if not hasattr(self, 'defs'):
            defs = None
            ExceptionCollector.appendException(
                ValidationError(message="defs is " + str(defs)))
        else:
            defs = self.defs
        if defs is not None and ndtype in defs:
            value = defs[ndtype]
        p = self.parent_type
        if p:
            inherited = p.get_definition(ndtype)
            if inherited:
                inherited = dict(inherited)
                if not value:
                    value = inherited
                else:
                    inherited.update(value)
                    value.update(inherited)
        return value


def update_definitions(version):
    exttools = ExtTools()
    extension_defs_file = exttools.get_defs_file(version)
    loader = toscaparser.utils.yamlparser.load_yaml
    nfv_def_file = loader(extension_defs_file)
    nfv_def = {}
    for section in EntityType.TOSCA_DEF_SECTIONS:
        if section in nfv_def_file.keys():
            value = nfv_def_file[section]
            for key in value.keys():
                nfv_def[key] = value[key]
    EntityType.TOSCA_DEF.update(nfv_def)
*/