#################################################################
#################################################################
### Cosmostat Classes
### The Cosmostat Server is a Class for the API running on the
### dashboard. This keeps track of all active systems that are
### actively reporting back to the Cosmostat Server Dashboard
### The static and active data is maintained in a single 
### Cosmostat Server Object, and this Object contains a List
### of Cosmostat Client Objects. This is where the data actually
### lives
#################################################################
#################################################################

import subprocess
import json
import time
import weakref
import base64, hashlib
from typing import Dict, Any, List
# Import Cosmos Settings
from Cosmos_Settings import *

#################################################################
### Cosmostat Server Class
### This Class is for maintaining a list of Client Objects.
### Each Object is a remote System reporting back
### The Class Functions are for the main application to interact
### with client Object data.
#################################################################

class CosmostatServer:

    ############################################################
    # instantiate new Cosmostat server
    ############################################################
    
    def __init__(self, name: str):
        # the system needs a name, should be equal to the uuid of the client
        self.name = name
        self.short_id = self.short_uuid(self.name)
        log_data(log_output = f"Cosmostat Server {self.short_id} initializing", log_level = "log_output")
        # system contains an array of CosmostatClient Objects
        self.systems = [] 

    def __str__(self):
        self_string = f"Cosmostat Server {self.short_id}"
        return self_string

    def __repr__(self):
        self_string = f"Cosmostat Server {self.short_id}"
        
    def add_system(self, system_dictionary: dict):
        if not self.check_uuid(system_dictionary["uuid"]):
            new_cosmostat_clilent = CosmostatClient(
                name = system_dictionary["short_id"], 
                uuid = system_dictionary["uuid"],
                hostname = system_dictionary["hostname"], 
                data_timestamp = time.time(),
                client_properties = system_dictionary["client_properties"], 
                redis_data = {}
                )
            self.systems.append(new_cosmostat_clilent)
            log_data(log_output = f'Client system {system_dictionary["short_id"]} added', log_level = "log_output")
        return new_cosmostat_clilent.data_timestamp


    def update_system(self, system_dictionary: {}, system_uuid: str):
        this_system = self.get_system(system_uuid)
        this_system.redis_data = system_dictionary
        this_system.data_timestamp = time.time()
        log_data(log_output = f"Client system {this_system.name} update requested, {this_system.uuid}", log_level = "log_output")
        data_age = time.time() - this_system.data_timestamp
        if int(data_age) > 60:
            self.systems.remove(this_system)
        return this_system.data_timestamp 


    def get_system(self, system_uuid: str): 
        log_data(log_output = f'Cosmostat - get_system - {system_uuid}', log_level = "debug_output")
        result = None
        for system in self.systems:
            if system.uuid == system_uuid:
                result = system
                break
        return result

    def short_uuid(self, value: str, length=8):
        hasher = hashlib.md5()
        hasher.update(value.encode('utf-8'))
        full_hex = hasher.hexdigest()
        return full_hex[:length]

    def check_uuid(self, uuid: str):
        uuid_exists = False
        for system in self.systems:
            if system.uuid == uuid:
                uuid_exists = True
        return uuid_exists

    def get_client_hostname(self, system_uuid: str):
        client = self.get_system(system_uuid)    
        return client.hostname

    def get_client_timestamp(self, system_hostname: str):
        client = self.get_system(get_uuid_from_hostname(system_hostname))    
        return client.data_timestamp
    
    def get_uuid_from_hostname(self, system_hostname):
        result = ""
        for system in self.systems:
            if system.hostname == system_hostname:
                result = system.uuid
        return result

    def get_client_hostnames(self, send_age = False):
        self.purge_stale_hostnames()
        result = []
        for system in self.systems:
            if send_age:
                result.append({"hostname": system.hostname, "data_age": age})
            else:
                result.append(system.hostname)
        return result
    
    def purge_stale_hostnames(self):
        now = time.time()
        fresh_systems = []
        for system in self.systems:
            age = now - system.data_timestamp
            if age <= 60:          # keep only fresh servers
                fresh_systems.append(system)
        self.systems = fresh_systems      # replace the old list        

#################################################################
### Cosmostat Client Class
### Each Class Object contains static and active data as well as
### the hostname and uuid/short_id.
### The timestamp is for removing stale Clients 
#################################################################

class CosmostatClient:        

    ############################################################
    # instantiate new Cosmostat server
    ############################################################
    
    def __init__(self, name: str, uuid: str, hostname: str, data_timestamp: float, client_properties: dict, redis_data: dict):
        self.name = name
        self.uuid = uuid
        self.hostname = hostname
        self.data_timestamp = data_timestamp
        self.client_properties = client_properties
        self.redis_data = redis_data

    def __str__(self):
        self_string = f'Cosmostat Client {self.name} - Hostname {self.hostname}'
        return self_string

    def __repr__(self):
        self_string = f'Cosmostat Client {self.name} - Hostname {self.hostname}'
        return self_string
    
    def get_properties(self):
        return self.client.properties

    def get_redis(self):
        return self.redis_data