#!/usr/bin/env python

import logging
import os

from redis_log_handler import RedisLogHandler
from redis_rpc_server import RedisRPCServer
from config import Config
from db_connector import DbConnector


class StorageRPCServer(RedisRPCServer):

    def __init__(self, host, port, db, rpcQueue):
        self.type = "storage"
        config = Config("/etc/vos_ts/vos_ts.conf")
        params = config.loadSection("file_catalog")
        self.dbConn = DbConnector(params["user"],
                                  params["password"],
                                  params["host"],
                                  params.getint("port"),
                                  params["db"],
                                  1,
                                  2)
        params = config.loadSection("logging")
        self.logger = logging.getLogger(__name__)
        logLevel = "logging." + params["log_level"]
        logFormat = params["log_format"]
        logFormatter = logging.Formatter(logFormat)
        self.logger.setLevel(eval(logLevel))
        redisLogHandler = RedisLogHandler()
        #logStreamHandler = logging.StreamHandler()
        #logStreamHandler.setFormatter(logFormatter)
        redisLogHandler.setFormatter(logFormatter)
        self.logger.addHandler(redisLogHandler)
        #self.logger.addHandler(logStreamHandler)
        super(StorageRPCServer, self).__init__(host, port, db, rpcQueue)

    def callback(self, requestBody):
        # 'requestType' attribute is mandatory
        if "requestType" not in requestBody:
            errorMsg = "Malformed request, missing parameters."
            response = { "responseType": "ERROR",
                         "errorCode": 1,
                         "errorMsg": errorMsg }
        elif requestBody["requestType"] == "STORAGE_ADD":
            storageType = requestBody["storageType"]
            storageBasePath = requestBody["basePath"]
            storageBaseUrl = requestBody["baseUrl"]
            storageHostname = requestBody["hostname"]
            if storageType != "portal":
                if not os.path.exists(storageBasePath):
                    errorMsg = "Base path doesn't exist."
                    self.logger.error(errorMsg)
                    response = { "responseType": "ERROR",
                                 "errorCode": 3,
                                 "errorMsg": errorMsg }
                    return response
            try:
                result = self.dbConn.insertStorage(storageType,
                                                   storageBasePath,
                                                   storageBaseUrl,
                                                   storageHostname)
            except Exception:
                errorMsg = "Database error."
                self.logger.exception(errorMsg)
                response = { "responseType": "ERROR",
                             "errorCode": 2,
                             "errorMsg": errorMsg }
                return response
            else:
                if result:
                    response = { "responseType": "STORAGE_ADD_DONE" }
                else:
                    errorMsg = "Storage point already exists."
                    self.logger.error(errorMsg)
                    response = { "responseType": "ERROR",
                                 "errorCode": 4,
                                 "errorMsg": errorMsg }
        elif requestBody["requestType"] == "STORAGE_DEL_REQ":
            try:
                result = self.dbConn.getStorageList()
            except Exception:
                errorMsg = "Database error."
                self.logger.exception(errorMsg)
                response = { "responseType": "ERROR",
                             "errorCode": 2,
                             "errorMsg": errorMsg }
                return response
            else:
                response = { "responseType": "STORAGE_DEL_ACK",
                             "storageList": result }
        elif requestBody["requestType"] == "STORAGE_DEL_CON":
            storageId = requestBody["storageId"]
            try:
                result = self.dbConn.deleteStorage(storageId)
            except Exception:
                errorMsg = "Database error."
                self.logger.exception(errorMsg)
                response = { "responseType": "ERROR",
                             "errorCode": 2,
                             "errorMsg": errorMsg }
                return response
            else:
                if result:
                    response = { "responseType": "STORAGE_DEL_DONE" }
                else:
                    errorMsg = "This storage location contains some VOSpace nodes. Please, move those nodes to another location."
                    self.logger.error(errorMsg)
                    response = { "responseType": "ERROR",
                                 "errorCode": 5,
                                 "errorMsg": errorMsg }
        elif requestBody["requestType"] == "STORAGE_LST":
            try:
                result = self.dbConn.getStorageList()
            except Exception:
                errorMsg = "Database error."
                self.logger.exception(errorMsg)
                response = { "responseType": "ERROR",
                             "errorCode": 2,
                             "errorMsg": errorMsg }
                return response
            else:
                response = { "responseType": "STORAGE_LST_DONE",
                             "storageList": result }

        else:
            errorMsg = "Unkown request type."
            self.logger.error(errorMsg)
            response = { "responseType": "ERROR",
                         "errorCode": 6,
                         "errorMsg": errorMsg }
        return response

    def run(self):
        self.logger.info(f"Starting RPC server of type {self.type}...")
        super(StorageRPCServer, self).run()