__filename__ = "person.py"
__author__ = "Bob Mottram"
__license__ = "AGPL3+"
__version__ = "0.0.1"
__maintainer__ = "Bob Mottram"
__email__ = "bob@freedombone.net"
__status__ = "Production"

import json
import commentjson
import os
import fileinput
import subprocess
from pprint import pprint
from pathlib import Path
from Crypto.PublicKey import RSA
from shutil import copyfile
from webfinger import createWebfingerEndpoint
from webfinger import storeWebfingerEndpoint
from posts import createOutbox
from auth import storeBasicCredentials
from roles import setRole

def generateRSAKey() -> (str,str):
    key = RSA.generate(2048)
    privateKeyPem = key.exportKey("PEM").decode("utf-8")
    publicKeyPem = key.publickey().exportKey("PEM").decode("utf-8")
    return privateKeyPem,publicKeyPem

def setProfileImage(baseDir: str,httpPrefix :str,nickname: str,domain: str, \
                    port :int,imageFilename: str,imageType :str,resolution :str) -> bool:
    """Saves the given image file as an avatar or background
    image for the given person
    """
    imageFilename=imageFilename.replace('\n','')
    if not (imageFilename.endswith('.png') or \
            imageFilename.endswith('.jpg') or \
            imageFilename.endswith('.jpeg') or \
            imageFilename.endswith('.gif')):
        print('Profile image must be png, jpg or gif format')
        return False

    if imageFilename.startswith('~/'):
        imageFilename=imageFilename.replace('~/',str(Path.home())+'/')

    if ':' in domain:
        domain=domain.split(':')[0]
    fullDomain=domain
    if port!=80 and port!=443:
        fullDomain=domain+':'+str(port)

    handle=nickname.lower()+'@'+domain.lower()
    personFilename=baseDir+'/accounts/'+handle+'.json'
    if not os.path.isfile(personFilename):
        print('person definition not found: '+personFilename)
        return False
    if not os.path.isdir(baseDir+'/accounts/'+handle):
        print('Account not found: '+baseDir+'/accounts/'+handle)
        return False

    iconFilenameBase='icon'
    if imageType=='avatar' or imageType=='icon':
        iconFilenameBase='icon'
    else:
        iconFilenameBase='image'
        
    mediaType='image/png'
    iconFilename=iconFilenameBase+'.png'
    if imageFilename.endswith('.jpg') or \
       imageFilename.endswith('.jpeg'):
        mediaType='image/jpeg'
        iconFilename=iconFilenameBase+'.jpg'
    if imageFilename.endswith('.gif'):
        mediaType='image/gif'
        iconFilename=iconFilenameBase+'.gif'
    profileFilename=baseDir+'/accounts/'+handle+'/'+iconFilename

    with open(personFilename, 'r') as fp:
        personJson=commentjson.load(fp)
        personJson[iconFilenameBase]['mediaType']=mediaType
        personJson[iconFilenameBase]['url']=httpPrefix+'://'+fullDomain+'/users/'+nickname+'/'+iconFilename
        with open(personFilename, 'w') as fp:
            commentjson.dump(personJson, fp, indent=4, sort_keys=False)

        cmd = '/usr/bin/convert '+imageFilename+' -size '+resolution+' -quality 50 '+profileFilename
        subprocess.call(cmd, shell=True)
        return True
    return False

def setOrganizationScheme(baseDir: str,nickname: str,domain: str, \
                          schema: str) -> bool:
    """Set the organization schema within which a person exists
    This will define how roles, skills and availability are assembled
    into organizations
    """
    # avoid giant strings
    if len(schema)>256:
        return False
    actorFilename=baseDir+'/accounts/'+nickname+'@'+domain+'.json'
    if not os.path.isfile(actorFilename):
        return False
    with open(actorFilename, 'r') as fp:
        actorJson=commentjson.load(fp)
        actorJson['orgSchema']=schema
        with open(actorFilename, 'w') as fp:
            commentjson.dump(actorJson, fp, indent=4, sort_keys=False)    
    return True

def createPersonBase(baseDir: str,nickname: str,domain: str,port: int, \
                     httpPrefix: str, saveToFile: bool,password=None) -> (str,str,{},{}):
    """Returns the private key, public key, actor and webfinger endpoint
    """
    privateKeyPem,publicKeyPem=generateRSAKey()
    webfingerEndpoint= \
        createWebfingerEndpoint(nickname,domain,port,httpPrefix,publicKeyPem)
    if saveToFile:
        storeWebfingerEndpoint(nickname,domain,port,baseDir,webfingerEndpoint)

    handle=nickname.lower()+'@'+domain.lower()
    if port!=80 and port!=443:
        domain=domain+':'+str(port)

    newPerson = {'@context': ['https://www.w3.org/ns/activitystreams',
                              'https://w3id.org/security/v1',
                              {'Emoji': 'toot:Emoji',
                               'Hashtag': 'as:Hashtag',
                               'IdentityProof': 'toot:IdentityProof',
                               'PropertyValue': 'schema:PropertyValue',
                               'alsoKnownAs': {'@id': 'as:alsoKnownAs', '@type': '@id'},
                               'focalPoint': {'@container': '@list', '@id': 'toot:focalPoint'},
                               'manuallyApprovesFollowers': 'as:manuallyApprovesFollowers',
                               'movedTo': {'@id': 'as:movedTo', '@type': '@id'},
                               'schema': 'http://schema.org#',
                               'toot': 'http://joinmastodon.org/ns#',
                               'value': 'schema:value'}],
                 'attachment': [],
                 'endpoints': {
                     'id': httpPrefix+'://'+domain+'/users/'+nickname+'/endpoints',
                     'sharedInbox': httpPrefix+'://'+domain+'/inbox',
                 },
                 'capabilityAcquisitionEndpoint': httpPrefix+'://'+domain+'/caps/new',
                 'followers': httpPrefix+'://'+domain+'/users/'+nickname+'/followers',
                 'following': httpPrefix+'://'+domain+'/users/'+nickname+'/following',
                 'orgSchema': None,
                 'skills': {},
                 'roles': {},
                 'availability': None,
                 'icon': {'mediaType': 'image/png',
                          'type': 'Image',
                          'url': httpPrefix+'://'+domain+'/users/'+nickname+'/icon.png'},
                 'id': httpPrefix+'://'+domain+'/users/'+nickname,
                 'image': {'mediaType': 'image/png',
                           'type': 'Image',
                           'url': httpPrefix+'://'+domain+'/users/'+nickname+'/image.png'},
                 'inbox': httpPrefix+'://'+domain+'/users/'+nickname+'/inbox',
                 'manuallyApprovesFollowers': False,
                 'name': nickname,
                 'outbox': httpPrefix+'://'+domain+'/users/'+nickname+'/outbox',
                 'preferredUsername': ''+nickname,
                 'publicKey': {'id': httpPrefix+'://'+domain+'/users/'+nickname+'#main-key',
                               'owner': httpPrefix+'://'+domain+'/users/'+nickname,
                               'publicKeyPem': publicKeyPem,
                               'summary': '',
                               'tag': [],
                               'type': 'Person',
                               'url': httpPrefix+'://'+domain+'/@'+nickname}
    }

    if saveToFile:
        # save person to file
        peopleSubdir='/accounts'
        if not os.path.isdir(baseDir+peopleSubdir):
            os.mkdir(baseDir+peopleSubdir)
        if not os.path.isdir(baseDir+peopleSubdir+'/'+handle):
            os.mkdir(baseDir+peopleSubdir+'/'+handle)
        if not os.path.isdir(baseDir+peopleSubdir+'/'+handle+'/inbox'):
            os.mkdir(baseDir+peopleSubdir+'/'+handle+'/inbox')
        if not os.path.isdir(baseDir+peopleSubdir+'/'+handle+'/outbox'):
            os.mkdir(baseDir+peopleSubdir+'/'+handle+'/outbox')
        if not os.path.isdir(baseDir+peopleSubdir+'/'+handle+'/ocap'):
            os.mkdir(baseDir+peopleSubdir+'/'+handle+'/ocap')
        if not os.path.isdir(baseDir+peopleSubdir+'/'+handle+'/queue'):
            os.mkdir(baseDir+peopleSubdir+'/'+handle+'/queue')
        filename=baseDir+peopleSubdir+'/'+handle+'.json'
        with open(filename, 'w') as fp:
            commentjson.dump(newPerson, fp, indent=4, sort_keys=False)

        # save the private key
        privateKeysSubdir='/keys/private'
        if not os.path.isdir(baseDir+'/keys'):
            os.mkdir(baseDir+'/keys')
        if not os.path.isdir(baseDir+privateKeysSubdir):
            os.mkdir(baseDir+privateKeysSubdir)
        filename=baseDir+privateKeysSubdir+'/'+handle+'.key'
        with open(filename, "w") as text_file:
            print(privateKeyPem, file=text_file)

        # save the public key
        publicKeysSubdir='/keys/public'
        if not os.path.isdir(baseDir+publicKeysSubdir):
            os.mkdir(baseDir+publicKeysSubdir)
        filename=baseDir+publicKeysSubdir+'/'+handle+'.pem'
        with open(filename, "w") as text_file:
            print(publicKeyPem, file=text_file)

        if password:
            storeBasicCredentials(baseDir,nickname,password)

    return privateKeyPem,publicKeyPem,newPerson,webfingerEndpoint

def noOfAccounts(baseDir: str) -> bool:
    """Returns the number of accounts on the system
    """
    accountCtr=0
    for subdir, dirs, files in os.walk(baseDir+'/accounts'):
        for account in dirs:
            if '@' in account:
                if not account.startswith('inbox'):
                    accountCtr+=1
    return accountCtr

def createPerson(baseDir: str,nickname: str,domain: str,port: int, \
                 httpPrefix: str, saveToFile: bool,password=None) -> (str,str,{},{}):
    """Returns the private key, public key, actor and webfinger endpoint
    """
    if not validNickname(nickname):
       return None,None,None,None
    privateKeyPem,publicKeyPem,newPerson,webfingerEndpoint = \
        createPersonBase(baseDir,nickname,domain,port,httpPrefix,saveToFile,password)
    if noOfAccounts(baseDir)==1:
        #print(nickname+' becomes the instance admin and a moderator')
        setRole(baseDir,nickname,domain,'instance','admin')
        setRole(baseDir,nickname,domain,'instance','moderator')
        setRole(baseDir,nickname,domain,'instance','delegator')
    return privateKeyPem,publicKeyPem,newPerson,webfingerEndpoint

def createSharedInbox(baseDir: str,nickname: str,domain: str,port: int, \
                      httpPrefix: str) -> (str,str,{},{}):
    """Generates the shared inbox
    """
    return createPersonBase(baseDir,nickname,domain,port,httpPrefix,True,None)

def createCapabilitiesInbox(baseDir: str,nickname: str,domain: str,port: int, \
                            httpPrefix: str) -> (str,str,{},{}):
    """Generates the capabilities inbox to sign requests
    """
    return createPersonBase(baseDir,nickname,domain,port,httpPrefix,True,None)
   
def validNickname(nickname: str) -> bool:
    forbiddenChars=['.',' ','/','?',':',';','@']
    for c in forbiddenChars:
        if c in nickname:
            return False
    reservedNames=['inbox','outbox','following','followers','capabilities']
    if nickname in reservedNames:
        return False
    return True
    
def personLookup(domain: str,path: str,baseDir: str) -> {}:
    """Lookup the person for an given nickname
    """
    if path.endswith('#main-key'):
        path=path.replace('#main-key','')
    notPersonLookup=['/inbox','/outbox','/outboxarchive', \
                     '/followers','/following','/featured', \
                     '.png','.jpg','.gif','.mpv']
    for ending in notPersonLookup:        
        if path.endswith(ending):
            return None
    nickname=None
    if path.startswith('/users/'):
        nickname=path.replace('/users/','',1)
    if path.startswith('/@'):
        nickname=path.replace('/@','',1)
    if not nickname:
        return None
    if not validNickname(nickname):
        return None
    if ':' in domain:
        domain=domain.split(':')[0]
    handle=nickname.lower()+'@'+domain.lower()
    filename=baseDir+'/accounts/'+handle.lower()+'.json'
    if not os.path.isfile(filename):
        return None
    personJson={"user": "unknown"}
    with open(filename, 'r') as fp:
        personJson=commentjson.load(fp)
    return personJson

def personBoxJson(baseDir: str,domain: str,port: int,path: str, \
                  httpPrefix: str,noOfItems: int,boxname: str, \
                  authorized: bool,ocapAlways: bool) -> []:
    """Obtain the inbox/outbox feed for the given person
    """
    if boxname!='inbox' and boxname!='outbox':
        return None

    if not '/'+boxname in path:
        return None

    # Only show the header by default
    headerOnly=True

    # handle page numbers
    pageNumber=None    
    if '?page=' in path:
        pageNumber=path.split('?page=')[1]
        if pageNumber=='true':
            pageNumber=1
        else:
            try:
                pageNumber=int(pageNumber)
            except:
                pass
        path=path.split('?page=')[0]
        headerOnly=False

    if not path.endswith('/'+boxname):
        return None
    nickname=None
    if path.startswith('/users/'):
        nickname=path.replace('/users/','',1).replace('/'+boxname,'')
    if path.startswith('/@'):
        nickname=path.replace('/@','',1).replace('/'+boxname,'')
    if not nickname:
        return None
    if not validNickname(nickname):
        return None
    if boxname=='inbox':
        return createInbox(baseDir,nickname,domain,port,httpPrefix, \
                           noOfItems,headerOnly,ocapAlways,pageNumber)
    return createOutbox(baseDir,nickname,domain,port,httpPrefix, \
                        noOfItems,headerOnly,authorized,pageNumber)

def personInboxJson(baseDir: str,domain: str,port: int,path: str, \
                    httpPrefix: str,noOfItems: int,ocapAlways: bool) -> []:
    """Obtain the inbox feed for the given person
    Authentication is expected to have already happened
    """
    if not '/inbox' in path:
        return None

    # Only show the header by default
    headerOnly=True

    # handle page numbers
    pageNumber=None    
    if '?page=' in path:
        pageNumber=path.split('?page=')[1]
        if pageNumber=='true':
            pageNumber=1
        else:
            try:
                pageNumber=int(pageNumber)
            except:
                pass
        path=path.split('?page=')[0]
        headerOnly=False

    if not path.endswith('/inbox'):
        return None
    nickname=None
    if path.startswith('/users/'):
        nickname=path.replace('/users/','',1).replace('/inbox','')
    if path.startswith('/@'):
        nickname=path.replace('/@','',1).replace('/inbox','')
    if not nickname:
        return None
    if not validNickname(nickname):
        return None
    return createInbox(baseDir,nickname,domain,port,httpPrefix, \
                       noOfItems,headerOnly,ocapAlways,pageNumber)

def setPreferredNickname(baseDir: str,nickname: str, domain: str, \
                         preferredName: str) -> bool:
    if len(preferredName)>32:
        return False
    handle=nickname.lower()+'@'+domain.lower()
    filename=baseDir+'/accounts/'+handle.lower()+'.json'
    if not os.path.isfile(filename):
        return False
    personJson=None
    with open(filename, 'r') as fp:
        personJson=commentjson.load(fp)
    if not personJson:
        return False
    personJson['preferredUsername']=preferredName
    with open(filename, 'w') as fp:
        commentjson.dump(personJson, fp, indent=4, sort_keys=False)
    return True

def setBio(baseDir: str,nickname: str, domain: str, bio: str) -> bool:
    if len(bio)>32:
        return False
    handle=nickname.lower()+'@'+domain.lower()
    filename=baseDir+'/accounts/'+handle.lower()+'.json'
    if not os.path.isfile(filename):
        return False
    personJson=None
    with open(filename, 'r') as fp:
        personJson=commentjson.load(fp)
    if not personJson:
        return False
    if not personJson.get('publicKey'):
        return False
    personJson['publicKey']['summary']=bio
    with open(filename, 'w') as fp:
        commentjson.dump(personJson, fp, indent=4, sort_keys=False)
    return True