#!/usr/bin/env python3
import pykwalify.core
import yaml,sys,logging,os, pickle, time
from pykwalify.errors import PyKwalifyException,SchemaError

class ConfigPyros:
    # (AKo) : Config file path is checked on the settings file, if the file isn't valid (i.e not found) the error will be launched by the settings file when starting the application 
    # read_files is an history of which config files has been read, where the key is the source file which is linked to a list of files associated to this key
    devices_links = {}
    current_file = None
    COMPONENT_PATH = "../../../../config/components/"
    GENERIC_DEVICES_PATH = "../../../../config/devices/"
    pickle_file = "obsconfig.p"
    obs_config = None
    devices = None
    computers = None
    agents = None 
    def verify_if_pickle_needs_to_be_updated(self,observatory_config_file)->bool:
        """[summary]

        Args:
            observatory_config_file ([type]): [description]

        Returns:
            bool: [description]
        """
        if os.path.isfile(self.pickle_file) == False:
            return True
        else:
            pickle_file_mtime = os.path.getmtime(self.pickle_file)
            obs_config_mtime = os.path.getmtime(observatory_config_file)
            if obs_config_mtime > pickle_file_mtime:
                return True
            
            obs_config = self.read_and_check_config_file(observatory_config_file)
            if obs_config is None:
                print(f"Error when trying to read config file (path of config file : {observatory_config_file}")
                return -1
            self.obs_config = obs_config
            # check last date of modification for devices files
            for device in self.obs_config["OBSERVATORY"]["DEVICES"]:
                device_file = self.CONFIG_PATH+device["DEVICE"]["file"]
                device_file_mtime = os.path.getmtime(device_file)
                if device_file_mtime > pickle_file_mtime:
                    return True
                
            for computer in self.obs_config["OBSERVATORY"]["COMPUTERS"]:
                computer_file = self.CONFIG_PATH+computer["COMPUTER"]["file"]
                computer_file_mtime = os.path.getmtime(computer_file)
                if computer_file_mtime > pickle_file_mtime:
                    return True
        return False

    def load(self,observatory_config_file):
        does_pickle_needs_to_be_updated = self.verify_if_pickle_needs_to_be_updated(observatory_config_file)
        if os.path.isfile(self.pickle_file) and does_pickle_needs_to_be_updated == False:
            print("Reading pickle file")
            try:
                can_pickle_file_be_read = False
                while can_pickle_file_be_read != True:
                    if os.access(self.pickle_file, os.R_OK):
                        pickle_dict = pickle.load(open(self.pickle_file,"rb"))
                        can_pickle_file_be_read = True
                    else:
                        time.sleep(0.5)
            except IOError:
                print("Error when reading the pickle file")
                
            self.obs_config = pickle_dict["obs_config"]
            self.computers = pickle_dict["computers"]
            self.devices = pickle_dict["devices"]
            self.devices_links = pickle_dict["devices_links"]
        else:
            print("Pickle file needs to be created or updated")
            pickle_dict = {}
            
            self.obs_config = self.read_and_check_config_file(observatory_config_file) 
            pickle_dict["obs_config"] = self.obs_config
            pickle_dict["devices"] = self.get_devices()
            pickle_dict["computers"] = self.get_computers()
            pickle_dict["devices_links"] = self.devices_links
            print("Writing pickle file")
            pickle.dump(pickle_dict,open(self.pickle_file,"wb"))

    def check_and_return_config(self,yaml_file:str,schema_file:str)->dict:
        """
        Check if yaml_file is valid for the schema_file and return an dictionary of the config file

        Args:
            yaml_file (str): Path to the config_file to be validated
            schema_file (str): Path to the schema file 

        Returns:
            dict: dictionary of the config file (with values)
        """
        # disable pykwalify error to clean the output
        logging.disable(logging.ERROR)
        try:
            can_yaml_file_be_read = False
            while can_yaml_file_be_read != True:
                if os.access(yaml_file, os.R_OK):
                    can_yaml_file_be_read = True
                else:
                    print(f"{yaml_file} can't be accessed, waiting for availability")
                    time.sleep(0.5)
        
            c = pykwalify.core.Core(source_file=yaml_file, schema_files=[schema_file])
            return c.validate(raise_exception=True)
        except SchemaError:
            for error in c.errors:
                print("Error :",str(error).split(". Path")[0])
                print("Path to error :",error.path)
            return None
        except IOError:
            print("Error when reading the observatory config file")

    def read_and_check_config_file(self,yaml_file:str)->dict:
        """
        Read the schema key of the config file to retrieve schema name and proceed to the checking of that config file
        Call check_and_return_config function and print its return.

        Args:
            yaml_file (str): path to the config file
        Returns:
            dict: Dictionary of the config file (with values)
        """
        self.current_file = yaml_file
        try:
            can_config_file_be_read = False
            while can_config_file_be_read != True:
                
                if os.access(yaml_file, os.R_OK):
                    can_config_file_be_read = True
                else:
                    print(f"{yaml_file} can't be accessed, waiting for availability")
                    time.sleep(0.5)
            with open(yaml_file, 'r') as stream:
                print(f"Reading {yaml_file}")
                config_file = yaml.safe_load(stream)

            self.SCHEMA_PATH = os.path.join(os.path.abspath(os.path.dirname(yaml_file)),"../../../config/schemas/")
            self.CONFIG_PATH = os.path.dirname(yaml_file)+"/"
            self.COMPONENT_PATH = os.path.join(os.path.abspath(os.path.dirname(yaml_file)),"../../../config/components/")
            self.GENERIC_DEVICES_PATH = os.path.join(os.path.abspath(os.path.dirname(yaml_file)),"../../../config/devices/")
            result = self.check_and_return_config(yaml_file,self.SCHEMA_PATH+config_file["schema"])
            if result is None:
                print("Error when reading and validating config file, please check the errors right above")

            return result

        except yaml.YAMLError as exc:
            print(exc)
        except Exception as e:
            print(e)
            return None
    
    def read_generic_component_and_return_attributes(self,component_name:str)->dict:
        file_path = self.COMPONENT_PATH + component_name + ".yml"
        try:
            with open(file_path, 'r') as stream:
                config_file = yaml.safe_load(stream)  
                
                attributes = {}
                for attribute in config_file:
                
                    attribute = attribute["attribute"]
                    attributes[attribute.pop("key")] = attribute
                return attributes
        except yaml.YAMLError as exc:
            print(exc)
        except Exception as e:
            print(e)
            return None
    
    def read_capability_of_device(self,capability:dict)->dict:
        """
        

        Args:
            dict ([type]): [description]

        Returns:
            dict: [description]
        """
        
        component_attributes = self.read_generic_component_and_return_attributes(capability["component"])
        
        attributes = {}
        for attribute in capability["attributes"]:
            attribute = attribute["attribute"]
        
            attributes[attribute.pop("key")] = attribute
        
        for attribute_name in attributes.keys():
            # merging values from general component to specific values of component in config file
            if "is_Enum" in component_attributes[attribute_name].keys():
                # check if value of this attribute is in Enum of general component attribute definition
                enum_values = component_attributes[attribute_name]["value"]
                if attributes[attribute_name]["value"][0] in enum_values:
                    # merge attributes of general component with specified component in device config file
                    new_attributes = {**component_attributes[attribute_name],**attributes[attribute_name]}
                else:
                    print(f"Error in file {self.current_file} : attribute \"{attribute_name}\" isn't in enum. Accepted values for this attribute : \"{enum_values}\"")
                    exit(1)
            # merge attributes of general component with specified component in device config file
            new_attributes = {**component_attributes[attribute_name],**attributes[attribute_name]}
            component_attributes[attribute_name] = new_attributes
        
        capability["attributes"] = component_attributes
        return capability



    def get_devices_names_and_file(self)->dict:
        """
        

        Returns:
            dict: [description]
        """
        devices_names_and_files = {}
        for device in self.obs_config["OBSERVATORY"]["DEVICES"]:
            device = device["DEVICE"]
            
            devices_names_and_files[device["name"]] = device["file"]
        return devices_names_and_files

    def read_device_config_file(self,config_file_name:str,is_generic=False)->dict:
        """

        Args:
            config_file_name (str): [description]

        Returns:
            dict: [description]
        """
        self.current_file = config_file_name
        print(f"Reading {config_file_name}")
        try:
            with open(config_file_name, 'r') as stream:
                config_file = yaml.safe_load(stream)
                if is_generic:
                    self.SCHEMA_PATH = os.path.join(os.path.abspath(os.path.dirname(config_file_name)),"../schemas/")
                else:
                    self.SCHEMA_PATH = os.path.join(os.path.abspath(os.path.dirname(config_file_name)),"../../../config/schemas/")
                
                result = self.check_and_return_config(config_file_name,self.SCHEMA_PATH+config_file["schema"])
                if result is None:
                    print("Error when reading and validating config file, please check the errors right above")
                else:
                    device = result["DEVICE"]
                    
                    if "generic" in device:
                        current_config = result
                        generic_device_config = self.read_device_config_file(self.GENERIC_DEVICES_PATH+device["generic"],True)
                        
                        new_config = {**generic_device_config["DEVICE"],**current_config["DEVICE"]}
           
                        result["DEVICE"] = new_config

                    if "CAPABILITIES" in device:
                        capabilities = []
                        for capability in device["CAPABILITIES"]:
                            capability = capability["CAPABILITY"]
                            
                            capabilities.append(self.read_capability_of_device(capability))
                            
                            
                            
                        device["CAPABILITIES"] = capabilities
                    if "ATTACHED_DEVICES" in device.keys():
                        
                        devices_name_and_file = self.get_devices_names_and_file()
                        active_devices = self.get_active_devices()
                        for attached_device in device["ATTACHED_DEVICES"]:
                            is_attached_device_link_to_agent = False
                            for active_device in active_devices:
                                if devices_name_and_file[active_device] == attached_device["file"]:
                                    is_attached_device_link_to_agent = True
                                    break

                            if self.CONFIG_PATH+attached_device["file"] != config_file_name and not is_attached_device_link_to_agent:
                                
                                config_of_attached_device = self.read_device_config_file(self.CONFIG_PATH+attached_device["file"])
                                
                                capabilities_of_attached_device = None
                                if "CAPABILITIES" in config_of_attached_device["DEVICE"].keys():
                                    capabilities_of_attached_device = config_of_attached_device["DEVICE"]["CAPABILITIES"]
                                if capabilities_of_attached_device is not None:
                                    # get name of device corresponding to the config file name
                                    parent_device_name = [device for device,file_name in devices_name_and_file.items() if file_name == config_file_name[len(self.CONFIG_PATH):] ][0]
                                    
                                    attached_device_name = [device for device,file_name in devices_name_and_file.items() if file_name == attached_device["file"]][0]
                                    
                                    self.devices_links[attached_device_name] = parent_device_name
                                    for capability in capabilities_of_attached_device:
                                        result["DEVICE"]["CAPABILITIES"].append(capability)
                return result
        except yaml.YAMLError as exc:
            print(exc)
        except Exception as e:
            print(e)
            return None

    def __init__(self,observatory_config_file:str) -> None:
        """
        Initiate class with the config file
        set content attribute to a dictionary containing all values from the config file

        Args:
            config_file_name (str): path to the config file
        """
        self.load(observatory_config_file)

   
    def get_obs_name(self)->str:
        """
        Return name of the observatory

        Returns:
            str: Name of the observatory
        """
        return self.obs_config["OBSERVATORY"]["name"]

    def get_channels(self,unit)->dict:
        """
        return dictionary of channels

        Returns:
            dict: [description]
        """
        channels = {}
        
        for channel_id in range(len(unit["TOPOLOGY"]["CHANNELS"])):
            channel = unit["TOPOLOGY"]["CHANNELS"][channel_id]["CHANNEL"]
            channels[channel["name"]] = channel
        return channels
    
    def get_computers(self)->dict:
        """
        return dictionary of computers

        Returns:
            dict: [description]
        """
        if self.computers != None:
            return self.computers
        else:
            computers = {}
            for computer_id in range(len(self.obs_config["OBSERVATORY"]["COMPUTERS"])):
                computer = self.obs_config["OBSERVATORY"]["COMPUTERS"][computer_id]["COMPUTER"]
                if( "file" in computer.keys() ):
                    computer["computer_config"]= self.read_and_check_config_file(self.CONFIG_PATH+computer["file"])["COMPUTER"]
                computers[computer["name"]] = computer
            return computers
    
    def get_devices(self)->dict:
        """
        return dictionary of devices
        
        Returns:
            dict: [description]
        """
        if self.devices != None:
            return self.devices

        else:
            devices = {}
            for device_id in range(len(self.obs_config["OBSERVATORY"]["DEVICES"])):
                device = self.obs_config["OBSERVATORY"]["DEVICES"][device_id]["DEVICE"]
                if( "file" in device.keys() ):
                    device["device_config"] = self.read_device_config_file(self.CONFIG_PATH+device["file"])["DEVICE"]
                devices[device["name"]] = device
            return devices

    def get_agents(self,unit)->dict:
        """
        return dictionary of agents 

        Returns:
            dict: dictionary of agents. For each agents tell the name, computer, device, protocole, etc...
        """
        if self.agents != None:
            return self.agents
        else:
            agents = {}
            
            
            for agent_id in range(len(unit["AGENTS"])):
                # Agents is a list containing dictionary that have only one key
                key = list(unit["AGENTS"][agent_id].keys())[0]
                agent = unit["AGENTS"][agent_id][key]
                agents[agent["name"]] = agent
            return agents

    def get_channel_groups(self,unit:dict)->dict:
        """
        Return dictionary of channel groups, tell the logic between groups of channels and within a group of channels

        Args:
            unit (dict): dictonary contaning all values of a unit
        Returns:
            dict: dictionary of channel groups (tell the logic and groups of channels)
        """
        info = {}
        info["global_groups_logic"] = unit["TOPOLOGY"]["CHANNEL_GROUPS"]["logic"]
        info["groups"] = {}
        for group_id in range(len(unit["TOPOLOGY"]["CHANNEL_GROUPS"]["GROUPS"])):
            group = unit["TOPOLOGY"]["CHANNEL_GROUPS"]["GROUPS"][group_id]["GROUP"]
            info["groups"][group_id] = group
        return info

    def get_channel_information(self,unit:dict,channel_name:str)->dict:
        """
        Return information of the given channel name of a unit

        Args:
            unit (dict): dictionary representing the unit 
            channel_name (str): name of the channel

        Returns:
            dict: dictionary containing all values that define this channel
        """
        channels = self.get_channels(unit)
        return channels[channel_name]

    def get_topology(self,unit:dict)->dict:
        """
        Return dictionary of the topology of the observatory

        Args:
            unit (dict): dictionary representing the unit
        Returns:
            dict: dictionary representing the topology of an unit (security, mount, channels, channel_groups)
        """
        topology = {}
        for key in unit["TOPOLOGY"].keys():
            branch = unit["TOPOLOGY"][key]
            if key == "CHANNELS":
                topology[key] = self.get_channels(unit)
            elif key == "CHANNEL_GROUPS":
                topology[key] = self.get_channel_groups(unit)
            else:
                topology[key] = branch
        return topology

    def get_active_agents(self,unit:dict)->list:
        """
        Return the list of active agents (i.e. agents that have an association with a device)

        Args:
            unit (dict): dictionary representing the unit

        Returns:
            list: kist of the name of active agents
        """
        return list(self.get_agents(unit).keys())

    def get_units(self)->dict:
        """
        Return all units sort by name defined in the config file

        Returns:
            dict: dictionary giving for a unit_name, his content (name,database,topology,agents,...)
        """
        result = {}
        units = self.obs_config["OBSERVATORY"]["UNITS"]
        for unit in units:
            unit = unit["UNIT"]
            result[unit["name"]] = unit
        return result

    def get_components_agents(self,unit:dict)->dict:
        """
        Return dictionary of component_agents of the given unit

        Args:
            unit (dict): dictionary representing the unit

        Returns:
            dict: dictionary sort by component name giving the associated agent (agent name)
        """
        components_agents = {}
        topology = self.get_topology(unit)
        for element in topology:
            if element in ("SECURITY","MOUNT","CHANNELS"):
                if(element != "CHANNELS"):
                    for component_agent in topology[element]["COMPONENT_AGENTS"]:
                        component_name = list(component_agent.keys())[0]
                        components_agents[component_name] = component_agent[component_name]
                else:
                    for channel in topology[element]:
                        for component_agent in topology[element][channel]["COMPONENT_AGENTS"]:
                            component_name = list(component_agent.keys())[0]
                            components_agents[component_name] = component_agent[component_name]
        return components_agents

    def get_units_name(self)->list:
        """
        Return list of units names 

        Returns:
            [list]: names of units
        """
        return list(self.get_units().keys())

    def get_unit_by_name(self,name:str)->dict:
        """
        Return dictionary containing definition of the unit that match the given name

        Args:
            name (str): name of the unit

        Returns:
            dict: dictonary representing the unit
        """
        return self.get_units()[name]
    
    def get_agents_per_computer(self,unit:dict)->dict:
        """
        Return dictionary that give for each computer, what are the associated agents to it as a list

        Args:
            unit (dict): dictonary representing the unit

        Returns:
            dict:  dictionary that give for each computer, what are the associated agents to it as a list

        """
        agents_per_computer = {}
        agents = self.get_agents(unit)
        for agent in agents:
            computer_name = agents[agent]["computer"]
            if(agents[agent]["computer"] not in agents_per_computer.keys()):
                agents_per_computer[computer_name] = [agent]
            else:
                agents_per_computer[computer_name].append(agent)
        return agents_per_computer


    def get_agents_per_device(self,unit:dict)->dict:
        """
        Return dictionary that give for each device, what are the associated agents to it as a list

        Args:
            unit (dict): dictonary representing the unit

        Returns:
            dict:  dictionary that give for each device, what are the associated agents to it as a list

        """
        agents_per_device = {}
        agents = self.get_agents(unit)
        for agent in agents:
            if("device" in agents[agent].keys()):
                device_name = agents[agent]["device"]
                if(agents[agent]["device"] not in agents_per_device.keys()):
                    agents_per_device[device_name] = [agent]
                else:
                    agents_per_device[device_name].append(agent)
        return agents_per_device

    def get_active_devices(self)->list:
        """
        Return a list of active device names

        Returns:
            list: list of active device names
        """
        active_devices = []
        for unit_name in self.get_units():
            unit = self.get_unit_by_name(unit_name)
            for device in self.get_agents_per_device(unit):
                active_devices.append(device)
        return active_devices

    def get_active_computers(self)->list:
        """
        Return a list of active computer names

        Returns:
            list: list of active computer names
        """
        active_computers = []
        for unit_name in self.get_units():
            unit = self.get_unit_by_name(unit_name)
            for computer in self.get_agents_per_computer(unit):
                active_computers.append(computer)
        return active_computers

    def get_agent_information(self,unit:dict,agent_name:str)->dict:
        """
        Give the dictionary of attributes of the agent for an unit.

        Args:
            unit (dict): dictonary representing the unit
            agent_name (str): agent name

        Returns:
            dict: dictionary containing attributes of the agent
        """
        return self.get_agents(unit)[agent_name]

    def get_device_information(self,device_name:str)->dict:
        """
        Give the dictionary of the attributes of the device 

        Args:
            device_name (str): device name

        Returns:
            dict: dictionary containing attributes of the device
        """
        return self.get_devices()[device_name]

    def get_database_for_unit(self,unit_name:str)->dict:
        """
        Return dictionary of attributes of the database for an unit

        Args:
            unit_name (str): unit name

        Returns:
            dict: dictionary of attributes of the database for an unit
        """
        return self.get_unit_by_name(unit_name)["DATABASE"]

    def get_device_for_agent(self,unit:dict,agent_name:str)->str:
        """
        Return device name associated to the agent

        Args:
            unit (dict): dictonary representing the unit
            agent_name (str): agent name

        Returns:
            str: device name associated to this agent
        """
        agents_per_device = self.get_agents_per_device(unit)
        for device in agents_per_device:
            if agent_name in agents_per_device[device]:
                return self.get_device_information(device)
    def get_unit_of_computer(self,computer_name:str)->str:
        """
        Return the name of the unit where the computer is used

        Args:
            computer_name (str): computer name

        Returns:
            str: unit name
        """
        for unit_name in self.get_units():
            unit = self.get_unit_by_name(unit_name)
            if(computer_name in self.get_agents_per_computer(unit)):
                return unit_name

    def get_unit_of_device(self,device_name:str)->str:
        """
        Return the name of the unit where the device is used

        Args:
            device_name (str): device name

        Returns:
            str: unit name
        """
        for unit_name in self.get_units():
            unit = self.get_unit_by_name(unit_name)
            if(device_name in self.get_agents_per_device(unit)):
                return unit_name

    def get_device_power(self,device_name:str)->dict:
        """
        Return dictionary that contains informations about power if this information is present in the device config file

        Return None if this information isn't stored in device's config file
        Args:
            device_name (str): name of the device

        Returns:
            dict: informations about power of device
        """
        return self.get_devices()[device_name]["device_config"].get("power")


    def get_device_capabilities(self,device_name:str)->list:
        """
        Return dictionary that contains informations about capabilities if this information is present in the device config file

        Return empty list if this information isn't stored in device's config file
        Args:
            device_name (str): name of the device

        Returns:
            list: list of capabilities of device
        """
        list_of_capabilities = []
        capabilities = self.get_devices()[device_name]["device_config"].get("CAPABILITIES")
        return capabilities

    def get_device_connector(self,device_name:str)->dict:
        """
        Return dictionary that contains informations about connector if this information is present in the device config file

        Return None if this information isn't stored in device's config file
        Args:
            device_name (str): name of the device

        Returns:
            dict: informations about connector of device
        """
        return self.get_devices()[device_name]["device_config"].get("connector")

    def get_computer_power(self,computer_name:str)->dict:
        """
        Return dictionary that contains informations about power if this information is present in the device config file

        Return None if this information isn't stored in device's config file
        Args:
            device_name (str): name of the device

        Returns:
            dict: informations about connector of device
        """
        return self.get_computers()[computer_name]["computer_config"].get("power")


def main():
    config = ConfigPyros("../../../../privatedev/config/guitalens/observatory_guitalens.yml")
    print(config.get_devices()["FLI-Kepler4040"]["device_config"])
    print(config.get_devices()["FLI-Kepler4040"]["device_config"]["CAPABILITIES"][1]["attributes"]["manufacturer"])
    print(config.get_devices()["FLI-Kepler4040"]["device_config"]["CAPABILITIES"])
if __name__ == "__main__": 

    main()