# Copyright 2022-2024 ETSI SDG TeraFlowSDN (TFS) (https://tfs.etsi.org/)
#
# 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.

import re,logging
import lxml.etree as ET
from typing import Collection, Dict
from .IP_LINK.IP_LINK_multivendor import ip_link_mgmt


def add_value_from_tag(target : Dict, field_name: str, field_value : ET.Element, cast=None) -> None:
    if isinstance(field_value,str) or field_value is None or field_value.text is None: return
    field_value = field_value.text
    if cast is not None: field_value = cast(field_value)
    target[field_name] = field_value

def add_value_from_collection(target : Dict, field_name: str, field_value : Collection) -> None:
    if field_value is None or len(field_value) == 0: return
    target[field_name] = field_value

"""
# Method Name: generate_templates
  
# Parameters:
  - resource_key:   [str]  Variable to identify the rule to be executed.
  - resource_value: [str]  Variable with the configuration parameters of the rule to be executed.
  - delete:         [bool] Variable to identify whether to create or delete the rule.
  - vendor:         [str]  Variable to identify the vendor of the equipment to be configured.
  
# Functionality:
  This method generates the template to configure the equipment using pyangbind. 
  To generate the template the following steps are performed:
  1) Get the first parameter of the variable "resource_key" to identify the main path of the rule.
  2) Search for the specific configuration path
  3) Call the method with the configuration parameters (resource_data variable). 
  
# Return:
  [dict] Set of templates generated according to the configuration rule
"""
def generate_templates(resource_key: str, resource_value: str, delete: bool,vendor:str) -> str:    # template management to be configured

    result_templates = []
    list_resource_key = resource_key.split("/")                                         # the rule resource key management
    if "ip_link" in list_resource_key[1]:                                      # network instance rules management
        result_templates.append(ip_link_mgmt(resource_value,vendor,delete))

    return result_templates


def extract_status (dic:dict,resource_key:str,xml_data:str,channel_name:str):
    
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)
    channel_name=channel_name if 'index'  not in channel_name else channel_name['index']
    index=None
    if channel_name.find('-') != -1 :
        index= channel_name.split("-")[1]
    
   
    namespaces = { "td": "http://openconfig.net/yang/terminal-device"}
    channels  = root.findall(f".//td:terminal-device/td:logical-channels/td:channel",namespaces) 
    for channel in channels : 
       
        index_ele= channel.find(f".//td:config[td:index='{index}']/td:{resource_key}",namespaces)
        if index_ele is not None :
           dic["status"]=index_ele.text
           print(index_ele.text)
    return dic


def extract_channel_xmlns (data_xml:str,is_opticalband:bool):
    xml_bytes = data_xml.encode("utf-8")
    root = ET.fromstring(xml_bytes) 
 
    namespace=None
    channels=None
  
    if (not is_opticalband) :
      
        optical_channel_namespaces = {
        'ns': 'urn:ietf:params:xml:ns:netconf:base:1.0',
          'oc': 'http://openconfig.net/yang/platform',
        }
       
        channels= root.find('.//{*}optical-channel',optical_channel_namespaces)
        if channels is not None :
          optical_channel_namespace = channels.tag.replace("optical-channel", "")
          namespace=optical_channel_namespace.replace("{", "").replace("}", "")
    else :       
        optical_band_namespaces= {
          'oc':'http://openconfig.net/yang/wavelength-router'
        }
        
        channels= root.find('.//{*}optical-bands',optical_band_namespaces)
        if channels is not None: 
          optical_channel_namespace = channels.tag.replace("optical-bands", "")
          namespace=optical_channel_namespace.replace("{", "").replace("}", "")
        
   
    return namespace
  
def extract_channels_based_on_channelnamespace (xml_data:str,channel_namespace:str,is_opticalband:bool):
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)
    channels=[]
   
    # Find the component names whose children include the "optical-channel" element
    if (not is_opticalband):
       namespace = {'namespace': 'http://openconfig.net/yang/platform','cn':channel_namespace}

       component_names = root.findall('.//namespace:component[cn:optical-channel]',namespace)

      # Extract and print the component names
       for component in component_names:
          component_name = component.find('namespace:name', namespace).text 
          channels.append({"index":component_name})
    else :
        namespaces = {
              'wr': 'http://openconfig.net/yang/wavelength-router',
              'fs': channel_namespace
        }
       
        wl = root.findall('.//fs:optical-band',namespaces=namespaces)
  
        for component in wl :
                index=component.find('.//fs:index',namespaces).text
                dest_port_name = component.find('.//fs:dest/fs:config/fs:port-name', namespaces).text

        # Retrieve port-name for source (assuming it exists in the XML structure)
                source_port_name = component.find('.//fs:source/fs:config/fs:port-name', namespaces).text
                channels.append({"index":index,"endpoints":(source_port_name,dest_port_name)})
             
        # Retrieve port-name for dest

    return channels
  
def extract_channels_based_on_type (xml_data:str):
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)

    namespace = {'oc': 'http://openconfig.net/yang/platform', 'typex': 'http://openconfig.net/yang/platform-types'}
    channel_names = []
    components = root.findall('.//oc:component', namespace)
    for component in components:
      
        type_element = component.find('.//oc:state/oc:type[.="oc-opt-types:OPTICAL_CHANNEL"]',namespaces=namespace)
    
        if type_element is not None and type_element.text == 'oc-opt-types:OPTICAL_CHANNEL':
            name_element = component.find('oc:name', namespace)
            if name_element is not None:
                channel_names.append(name_element.text)
    return channel_names            
    
def extract_value(resource_key:str,xml_data:str,dic:dict,channel_name:str,channel_namespace:str):
 
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)
    channel_name=channel_name if 'index'  not in channel_name else channel_name['index']
    namespace = {'oc': 'http://openconfig.net/yang/platform',
              'td': channel_namespace}

    element = root.find(f'.//oc:component[oc:name="{channel_name}"]', namespace)

    if element is not None:
      parameter= element.find(f'.//td:{resource_key}',namespace)
      if (parameter is not None):
        value = parameter.text
        dic[resource_key]=value
      else :
           logging.info("parameter is None")    
      
    else:
       logging.info("element is None")     
       print(" element not found.")
  
    return dic  


def extract_port_value (xml_string:list,port_name:str):

    xml_bytes = xml_string.encode("utf-8")
    root = ET.fromstring(xml_bytes)

    namespace = {"oc": "http://openconfig.net/yang/platform"}
    component=root.find(f".//oc:component[oc:name='{port_name}']", namespace)
    onos_index = component.find(
        f".//oc:property//oc:state/oc:name[.='onos-index']/../oc:value", namespace
    ).text
  
    return (port_name,onos_index)
            
           

  
def extract_tranceiver (data_xml:str,dic:dict):
    xml_bytes = data_xml.encode("utf-8")
    root = ET.fromstring(xml_bytes)
    namespaces = {
      'ns': 'urn:ietf:params:xml:ns:netconf:base:1.0',
      'oc': 'http://openconfig.net/yang/platform',
      'oc-terminal': 'http://openconfig.net/yang/terminal-device',
      'oc-platform-types': 'http://openconfig.net/yang/platform-types'
    }

 
    transceiver_components = root.findall('.//oc:component/oc:state/[oc:type="oc-platform-types:TRANSCEIVER"]../oc:state/oc:name', namespaces)
   
    component_names = [component.text for component in transceiver_components]
    dic['transceiver']=component_names
    return dic
  
def extract_interface (xml_data:str,dic:dict):
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)
    namespaces = {
    'ns': 'urn:ietf:params:xml:ns:netconf:base:1.0',
    'oc': 'http://openconfig.net/yang/interfaces',
    }
    ip_namespaces = {
    'oc': 'http://openconfig.net/yang/interfaces',
    'ip': 'http://openconfig.net/yang/interfaces/ip',
    }

    interfaces = root.findall('.//oc:interfaces/oc:interface', namespaces)
    interface_names = [interface.find('oc:name', namespaces).text for interface in interfaces]
    interface_enabled=[interface.find('oc:config/oc:enabled', namespaces).text for interface in interfaces]
    ip_address_element = root.find('.//ip:ip', ip_namespaces)
    interface_prefix_length=root.find('.//ip:prefix-length',ip_namespaces)
    if (len(interface_names) > 0):
       dic['interface']={"name":interface_names[0],'ip':ip_address_element.text,'enabled':interface_enabled[0],"prefix-length":interface_prefix_length.text}
    else :
        dic['interface']={}   
    return dic
  
def has_opticalbands(xml_data:str):
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)
 
    has_opticalbands=False
    elements= root.find('.//{*}optical-bands')

    if (elements is not None and len(elements) >0):
      has_opticalbands=True
    else :
      has_opticalbands=False
    return has_opticalbands
  
def extract_ports_based_on_type (xml_data:str):
    pattern = r':\s*PORT\b'
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)
    namespace = {'oc': 'http://openconfig.net/yang/platform', 'typex': 'http://openconfig.net/yang/platform-types'}
    ports = []
    components = root.findall(".//oc:state[oc:type]",namespace)
    for component in components:
         type_ele = component.find(".//oc:type",namespace)
         match = re.search(pattern, type_ele.text)
         if match is not None :
            name_element= component.find(".//oc:name",namespace)
            port_name =name_element.text       
            port_index=name_element.text.split("-")[1]
            port = (port_name,port_index)
            ports.append(port)
    return ports  
    
def transponder_values_extractor(data_xml:str,resource_keys:list,dic:dict):
   
    endpoints=[]
    is_opticalband=has_opticalbands(xml_data=data_xml)
    channel_namespace=extract_channel_xmlns(data_xml=data_xml,is_opticalband=is_opticalband)
    # channel_names=extract_channels_based_on_type(xml_data=data_xml) 
    # if len(channel_names)==0 :
    channel_names= extract_channels_based_on_channelnamespace(xml_data=data_xml,channel_namespace=channel_namespace,is_opticalband=is_opticalband)
    ports = extract_ports_based_on_type(data_xml)
    optical_channels_params=[]
    ports_result=[]
    if (is_opticalband):
        endpoints=channel_names
    else:
            
        for channel_name in channel_names:
            dic={}
            for resource_key in resource_keys  :
                
                if (resource_key != 'admin-state'):
                  
                    dic=extract_value(dic=dic,resource_key=resource_key,xml_data=data_xml
                                      ,channel_name=channel_name,channel_namespace=channel_namespace)  
                else : 
                    dic = extract_status(dic=dic,resource_key=resource_key,xml_data=data_xml, channel_name=channel_name) 
            dic["name"]=channel_name
            endpoints.append({"endpoint_uuid":{"uuid":channel_name}})
            optical_channels_params.append(dic)                
    #transceivers_dic=extract_tranceiver(data_xml=data_xml,dic={})
    transceivers_dic={"transceiver":[]}
    #interfaces_dic=extract_interface(xml_data=data_xml,dic={})
    if len(ports)>0 :
      for port in ports :
        endpoint_name,endpoint_id=port
        resource_key = '/endpoints/endpoint[{:s}]'.format(endpoint_id)
        resource_value = {'uuid': endpoint_id, 'type':endpoint_name}
        ports_result.append((resource_key, resource_value))
      
   
    return [transceivers_dic,optical_channels_params,channel_namespace,endpoints,ports_result]
  
#########################################################################  
  
#################################### ROADMAs ############################
  
##########################################################################  

def extract_roadm_ports (xml_data:str):
  
    ports =[]
    pattern1 = r'\bMG_ON_OPTICAL_PORT_WAVEBAND\b'
    pattern2 = r'\bMG_ON_OPTICAL_PORT_MEDIACHANNEL\b'
    pattern3 = r'\bINPUT\b'
    pattern4 = r'\bOUTPUT\b'
    
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)
    with open('xml.log', 'w') as f:
         print(xml_bytes, file=f)
    

    namespace = {'oc': 'http://openconfig.net/yang/platform'}
    ports_wb_in = []
    ports_mc_in = []
    ports_wb_out = []
    ports_mc_out = []
    components = root.findall('.//oc:component',namespace)
    print(f"component {components}")
    
    
    for component  in components:
       
        properties = component.find(".//oc:properties",namespace)
        name_element= component.find(".//oc:name",namespace)
        print(name_element.text)
        if (properties is not None):
            wb_x = 0
            mc_x = 0
            in_x = 0
            out_x = 0
            for property in properties :
                value = property.find(".//oc:value",namespace)
                if (re.search(pattern1,value.text)):
                    wb_x = 1
                elif (re.search(pattern2,value.text)):
                    mc_x = 1
                elif (re.search(pattern3,value.text)):
                    in_x = 1
                elif (re.search(pattern4,value.text)):
                    out_x = 1
            if wb_x == 1:
                if in_x ==1:
                    ports_wb_in.append(name_element.text)
                elif out_x == 1:
                    ports_wb_out.append(name_element.text)
            if mc_x == 1:
                if in_x ==1:
                    ports_mc_in.append(name_element.text)
                elif out_x == 1:
                    ports_mc_out.append(name_element.text)
            
    return ports_wb_in, ports_wb_out, ports_mc_in, ports_mc_out                


  
def roadm_values_extractor (data_xml:str,resource_keys:list,dic:dict):
    ports_result=[]
    ports_wb_in, ports_wb_out, ports_mc_in, ports_mc_out = extract_roadm_ports(data_xml)
     
    #if len(ports)>0 :
    #    for port in ports :
    #    
    #        resource_key = '/endpoints/endpoint[{:s}]'.format(port)
    #        resource_value = {'uuid': port, 'type':'MG_ON_OPTICAL_PORT_WAVEBAND'}
    #        ports_result.append((resource_key, resource_value))
    if len(ports_wb_in)>0 :
        for port in ports_wb_in:
        
            resource_key = '/endpoints/endpoint[{:s}]'.format(port)
            resource_value = {'uuid': port, 'type':'MG_ON_OPTICAL_PORT_WAVEBAND'}
            ports_result.append((resource_key, resource_value))
      
    return [ports_result]   
 
 
 
 #/////////////// OpenRoadm //////////////
 
 
def extract_roadm_circuits_pack (xml_data:str):
  
   
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)
    # with open('xml.log', 'w') as f:
    #      print(xml_bytes, file=f)
    
    
    namespace = {'oc': "http://org/openroadm/device"}
    
    circuits = root.findall('.//oc:circuit-packs',namespace)
  
    circuits_list =[]
    # print(f"component {components}")
    
    if (circuits is not None):
        circuit_info ={}
        for circuit  in circuits:
        
            circuit_name = circuit.find(".//oc:circuit-pack-name",namespace)
            circuit_type=circuit.find(".//oc:circuit-pack-type",namespace)
            circuit_adminstrative_status=circuit.find(".//oc:administrative-state",namespace)
            circuit_equipment_state=circuit.find("./oc:equipment-state",namespace)
            circuit_mode=circuit.find("./oc:circuit-pack-mode",namespace)
            slot= circuit.find("./oc:slot",namespace)
            shelf= circuit.find("./oc:shelf",namespace)
            ports = circuit.findall("./oc:ports",namespace)
           
            circuit_ports=[]
            if (ports is not None):
                
                for port in ports :
                    port_info={}
                    port_name=port.find('./oc:port-name',namespace)
                    port_qual= port.find("./oc:port-qual",namespace)
                   
                    if port_name is not None :
                        port_info["port_name"]=port_name.text
                    if port_qual is not None :
                        port_info["port_qual"]=port_qual.text
                    circuit_ports.append(port_info)            
            if (circuit_name is not None):
                circuit_info["circuit_name"]=circuit_name.text
            if (circuit_type is not None):
                circuit_info["circuit_type"]=circuit_type.text
            if (circuit_adminstrative_status is not None):
                circuit_info["circuit_adminstrative_status"]=circuit_adminstrative_status.text
            if (circuit_equipment_state is not None):
                circuit_info["circuit_equipment_state"]=circuit_equipment_state.text
            if (circuit_mode is not None):
                circuit_info["circuit_mode"]=circuit_mode.text
            if (slot is not None):
                circuit_info["slot"]=slot.text
            if (shelf is not None):
                circuit_info["shelf"]=shelf.text
            circuit_info["ports"]=circuit_ports 
                                   
            circuits_list.append(circuit_info)   
          
        
    return circuits_list                



def extract_openroadm_info(xml_data:str):
    roadm_info={"node-id":None,"node-number":None,"node-type":None,'clli':None}
    xml_bytes = xml_data.encode("utf-8")
    root = ET.fromstring(xml_bytes)
    namespace = {'oc': "http://org/openroadm/device"}
    info = root.findall('.//oc:info',namespace)
    if info is not None :
        for i in info :
            node_id= i.find('.//oc:node-id',namespace)
            node_number= i.find('.//oc:node-number',namespace)
            node_type=i.find('.//oc:node-type',namespace)
            clli=i.find('.//oc:clli',namespace)
            if (node_id is not None):
                roadm_info['node-id']=node_id.text
            if (node_number is not None):
                roadm_info['node-number']=node_number.text
            if (node_type is not None):
                roadm_info['node-type']=node_type.text
            if (clli is not None):
                roadm_info['clli']=clli.text
    return roadm_info                    
