__filename__="migrate.py"
__author__="Bob Mottram"
__license__="AGPL3+"
__version__="1.1.0"
__maintainer__="Bob Mottram"
__email__="bob@freedombone.net"
__status__="Production"

import os

def migrateFollows(followFilename: str,oldHandle: str,newHandle: str) -> None:
    """Changes a handle within following or followers list
    """
    if not os.path.isfile(followFilename):
        return
    if oldHandle not in open(followFilename).read():
        return
    followData=None
    with open(followFilename, 'r') as followFile:
        followData=followFile.read()
    if not followData:
        return
    newFollowData=followData.replace(oldHandle,newHandle)
    if followData==newFollowData:
        return
    with open(followFilename, 'w') as followFile:
        followFile.write(newFollowData)

def migrateAccount(baseDir: str,oldHandle: str,newHandle: str) -> None:
    """If a followed account changes then this modifies the
    following and followers lists for each account accordingly
    """
    if oldHandle.startswith('@'):
        oldHandle=oldHandle[1:]
    if '@' not in oldHandle:
        return
    if newHandle.startswith('@'):
        ewHandle=newHandle[1:]
    if '@' not in newHandle:
        return

    # update followers and following lists for each account
    for subdir, dirs, files in os.walk(baseDir+'/accounts'):
        for handle in dirs:
            if '@' in handle:
                accountDir=baseDir+'/accounts/'+handle
                followFilename=accountDir+'/following.txt'
                migrateFollows(followFilename,oldHandle,newHandle)
                followFilename=accountDir+'/followers.txt'
                migrateFollows(followFilename,oldHandle,newHandle)