#!/usr/bin/env python
#
# Licensed to the Apache Software Foundation (ASF) under one
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# regarding copyright ownership.  The ASF licenses this file
# to you 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
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import argparse
import traceback
import sys
try:
    from google.protobuf.text_format import Merge
    from google.protobuf.text_format import MessageToString
except Exception as missingLib:
    sys.exit("You need python protobuf library. Get it from: pip install protobuf")

try:
    from proto import MLDataFormats_pb2
except Exception as missingLib:
    sys.exit("Incompatible proto/MLDataFormats_pb2.py. Regenerate using: "+ 
    "protoc -I=${PULSAR_PATH}/managed-ledger/src/main/proto --python_out=${PULSAR_PATH}/bin/proto/ "+
    "${PULSAR_PATH}/managed-ledger/src/main/proto/MLDataFormats.proto")

try:
    from kazoo.client import KazooClient
except Exception as missingLib:
    sys.exit("You need Kazoo ZK client library. Get it from: pip install kazoo")

'''
This util provides API to access managed-ledger data and also 
provides command line tool-access to execute these commands.
'''
managedLedgerPath = "/managed-ledgers/"
printMlCommand = "print-managed-ledger"
deleteMlLedgerIds = "delete-managed-ledger-ids"
printCursorsCommands = "print-cursor"
updateMakDeleteCursor = "update-mark-delete-cursor"

'''
Returns managed-ledger info for given managed-leger path 
Parameters
----------
zk : KazooClient
   Zookeeper-client instance to query zk-client.
mlPath : str
    managed-ledger path
''' 
def getManagedLedgerInfo(zk, mlPath):
    try:
        # get managed-ledger info
        mlData = zk.get(mlPath)[0]
        mlInfo = MLDataFormats_pb2.ManagedLedgerInfo()
        try:
            mlInfo.ParseFromString(mlData)
        except Exception as formatException:
            Merge(mlData, mlInfo)
        return mlInfo
    except Exception as e:
            traceback.print_exc()
            print('Failed to get data for {} due to {}'.format(mlPath, repr(e)))


'''
Delete specific ledgerIds from the managed-ledger info and updates into zk
Parameters
----------
zk : KazooClient
   Zookeeper-client instance to query zk-client.
mlPath : str
    managed-ledger path
deleteLedgerIds : str
    comma separated deleting ledger-ids (eg: 123,124)
'''  
def deleteLedgerIdsFromManagedLedgerInfo(zk, mlPath, deletLedgerIds):
    try:
        # get managed-ledger info
        (mlData, mlStat) = zk.get(mlPath)
        mlInfo = MLDataFormats_pb2.ManagedLedgerInfo()
        isTextFormat = False
        try:
            mlInfo.ParseFromString(mlData)
        except Exception as formatException:
            Merge(mlData, mlInfo)
            isTextFormat = True
        
        ledgerInfoList = mlInfo.ledgerInfo
        
        i = 0
        while i < len(ledgerInfoList):
            ledgerInfo = ledgerInfoList[i]
            if ledgerInfo.ledgerId in deletLedgerIds:
                ledgerInfoList.remove(ledgerInfo)
            else:
                i += 1
        
        updatedMlInfo = None
        if isTextFormat:
            updatedMlInfo = MessageToString(mlInfo, True)
        else:
            updatedMlInfo = mlInfo.SerializeToString(); 
        zk.set(mlPath, updatedMlInfo, version=mlStat.version)
        print('Updated {} with value\n{}'.format(mlPath, str(mlInfo)))
        
    except Exception as e:
            traceback.print_exc()
            print('Failed to delete ledgerIds for {} due to {}'.format(mlPath, repr(e)))

'''
Returns managed-ledger cursor info for given managed-cursor path
Parameters
----------
zk : KazooClient
   Zookeeper-client instance to query zk-client.
mlPath : str
    managed-ledger path
cursorName : str
    managed-cursor path
'''
def getManagedCursorInfo(zk, mlPath):
    try:
        cursors = zk.get_children(mlPath)
        cursorList = {}
        for cursor in cursors:
            cursorData = zk.get(mlPath + "/" + cursor)[0]
            cursorInfo = MLDataFormats_pb2.ManagedCursorInfo()
            try:
                cursorInfo.ParseFromString(cursorData)
            except Exception as formatException:
                Merge(cursorData, cursorInfo)
            cursorList[cursor] = cursorInfo
        return cursorList
    except Exception as e:
            traceback.print_exc()
            print('Failed to get ml-cursor {} due to {}'.format(mlPath, repr(e)))


'''
Update mark-delete position of the given managed-cursor into zk
Parameters
----------
zk : KazooClient
   Zookeeper-client instance to query zk-client.
mlPath : str
    managed-ledger path
cursorName : str
    managed-cursor path
markDeletePosition: str
    markDeletePosition combination of <ledgerId>:<entryId> (eg. 123:1)
''' 
def updateCursorMarkDelete(zk, cursorPath, markDeleteLedgerId, markDeleteEntryId):
    try:
        (cursorData, cursorStat) = zk.get(cursorPath)
        cursorInfo = MLDataFormats_pb2.ManagedCursorInfo()
        isTextFormat = False
        try:
            cursorInfo.ParseFromString(cursorData)
        except Exception as formatException:
            Merge(cursorData, cursorInfo)
            isTextFormat = True
        cursorInfo.markDeleteLedgerId = markDeleteLedgerId
        cursorInfo.markDeleteEntryId = markDeleteEntryId
        sData = None
        if isTextFormat:
            sData = MessageToString(cursorInfo, True)
        else:
            sData = cursorInfo.SerializeToString()
        zk.set(cursorPath, sData, version=cursorStat.version)
        print('Updated {} with value \n{}'.format(cursorPath, cursorInfo))
    except Exception as e:
            traceback.print_exc()
            print('Failed to update ml-cursor {} due to {}'.format(cursorPath, repr(e)))


'''
print managed-ledger info for given managed-leger path 
Parameters
----------
zk : KazooClient
   Zookeeper-client instance to query zk-client.
mlPath : str
    managed-ledger path
    
eg: 
print-managed-ledger --zkServer localhost:2181 --managedLedgerPath sample/standalone/ns1/persistent/test
''' 
def printManagedLedgerCommand(zk, mlPath):
    print(getManagedLedgerInfo(zk, mlPath))
    

'''
print managed-ledger cursor info for given managed-cursor path
Parameters
----------
zk : KazooClient
   Zookeeper-client instance to query zk-client.
mlPath : str
    managed-ledger path
cursorName : str
    managed-cursor path

eg:
print-cursor --zkServer localhost:2181 --managedLedgerPath sample/standalone/ns1/persistent/test --cursorName s1
'''
def printManagedCursorCommand(zk, mlPath, cursorName):
    try:
        if cursorName:
            print(getManagedCursorInfo(zk, mlPath)[cursorName])
        else:
            print('Usage: --command {} [--cursorName]'.format(printCursorsCommands))
    except Exception as e:
        traceback.print_exc()
        print('No cursor found for {}/{}'.format(mlPath, cursorName))

'''
delete specific ledgerIds from the managed-ledger info
Parameters
----------
zk : KazooClient
   Zookeeper-client instance to query zk-client.
mlPath : str
    managed-ledger path
deleteLedgerIds : str
    comma separated deleting ledger-ids (eg: 123,124)
eg:
delete-managed-ledger-ids --zkServer localhost:2181 --managedLedgerPath sample/standalone/ns1/persistent/test --ledgerIds 3
'''    
def deleteMLLedgerIdsCommand(zk, mlPath, deleteLedgerIds):
    try:
        if deleteLedgerIds:
            deletLedgerIds = set(deleteLedgerIds.split(","))
            deletLedgerIdSet = set()
            for id in deletLedgerIds:
                deletLedgerIdSet.add(long(id))
            deleteLedgerIdsFromManagedLedgerInfo(zk, mlPath, deletLedgerIdSet)
        else:
            print('Usage: --command {} [--ledgerIds]'.format(deleteMlLedgerIds))
    except Exception as e:
        traceback.print_exc()
        print('Failed to delete ml-ledger_ids {} due to {}'.format(mlPath, repr(e)))

'''
Update mark-delete position of the given managed-cursor
Parameters
----------
zk : KazooClient
   Zookeeper-client instance to query zk-client.
mlPath : str
    managed-ledger path
cursorName : str
    managed-cursor path
markDeletePosition: str
    markDeletePosition combination of <ledgerId>:<entryId> (eg. 123:1)

eg:
update-mark-delete-cursor --zkServer localhost:2181 --managedLedgerPath sample/standalone/ns1/persistent/test --cursorName s1 --cursorMarkDelete 0:1 
'''    
def updateMarkDeleteOfCursorCommand(zk, mlPath, cursorName, markDeletePosition):
    try:
        if cursorName:
            if markDeletePosition:
                positionPair = markDeletePosition.split(":")
                if len(positionPair) == 2:
                    updateCursorMarkDelete(zk, mlPath + "/" + cursorName, (long(positionPair[0])), long(positionPair[1]))
                else:
                    print("markDeletePosition must be in format <ledger_id>:<entry_id>")
            else:
                print('Usage: --command {} [----cursorName] [--cursorMarkDelete]'.format(updateMakDeleteCursor))
        else:
            print('Usage: --command {} [--cursorName] [--cursorMarkDelete]'.format(updateMakDeleteCursor))
        
        
    except Exception as e:
        traceback.print_exc()
        print('Failed to update ml-cursor {}/{} due to {}'.format(mlPath, cursorName, repr(e)))
            
if __name__ in '__main__':
    
    commandHelpText = 'Managed-ledger command: \n{}, {}, {}, {}'.format(printMlCommand, deleteMlLedgerIds, printCursorsCommands, updateMakDeleteCursor)
    
    try:
        command = sys.argv[1]
    except Exception as indexError:
        print('ERROR: Pass command as a first argument, supported {}\n\n'.format(commandHelpText))
    arguments = sys.argv[2:]
    parser = argparse.ArgumentParser()
    parser.add_argument("--zkServer", "-zk", required=True, help="ZooKeeperServer:port")
    parser.add_argument("--managedLedgerPath", "-mlp", required=True, help="Managed-ledger path")
    parser.add_argument("--ledgerIds", "-lid", required=False, help="Delete ledger ids: comma separated")
    parser.add_argument("--cursorName", "-cn", required=False, help="Managed-ledger cursor name")
    parser.add_argument("--cursorMarkDelete", "-cm", required=False, help="Cursor mark delete position: <ledger_id>:<entry_id>")
    args = parser.parse_args(arguments)

    zkSrvr = args.zkServer
    mlPath = managedLedgerPath + args.managedLedgerPath
    deleteLedgerIds = args.ledgerIds
    cursorName = args.cursorName
    cursorMarkDelete = args.cursorMarkDelete

    zk = KazooClient(hosts=zkSrvr)
    zk.start()
    
    if command == printMlCommand:
        printManagedLedgerCommand(zk, mlPath)
    elif command == deleteMlLedgerIds:
        deleteMLLedgerIdsCommand(zk, mlPath, deleteLedgerIds)
    elif command == printCursorsCommands:
        printManagedCursorCommand(zk, mlPath, cursorName)
    elif command == updateMakDeleteCursor:
        updateMarkDeleteOfCursorCommand(zk, mlPath, cursorName, cursorMarkDelete)
    else:
        print('{} command not found. supported {}, pass command as a first argument'.format(command, commandHelpText))