'''
    Onionr - Private P2P Communication

    This default plugin handles "flow" messages (global chatroom style communication)
'''
'''
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
'''

# Imports some useful libraries
import threading, time, locale, sys, os
from onionrblockapi import Block
import logger, config, onionrblocks
from onionrutils import escapeansi, epoch, bytesconverter
locale.setlocale(locale.LC_ALL, '')
from coredb import blockmetadb
from utils import identifyhome, reconstructhash
import deadsimplekv as simplekv
sys.path.insert(0, os.path.dirname(os.path.realpath(__file__)))
import flowapi # import after path insert
flask_blueprint = flowapi.flask_blueprint

plugin_name = 'flow'
PLUGIN_VERSION = '0.0.1'
board_cache = simplekv.DeadSimpleKV(identifyhome.identify_home() + '/board-index.cache.json')

class OnionrFlow:
    def __init__(self):
        self.alreadyOutputed = []
        self.flowRunning = False
        self.channel = ""
        return

    def start(self):
        logger.warn("Please note: everything said here is public, even if a random channel name is used.", terminal=True)
        message = ""
        self.flowRunning = True
        try:
            self.channel = logger.readline("Enter a channel name or none for default:").strip()
        except (KeyboardInterrupt, EOFError) as e:
            self.flowRunning = False
        newThread = threading.Thread(target=self.showOutput, daemon=True)
        newThread.start()
        while self.flowRunning:
            if self.channel == "":
                self.channel = "global"
            try:
                message = logger.readline('\nInsert message into flow:').strip().replace('\n', '\\n').replace('\r', '\\r')
            except EOFError:
                pass
            except KeyboardInterrupt:
                self.flowRunning = False
            else:
                if message == "q":
                    self.flowRunning = False
                expireTime = epoch.get_epoch() + 43200
                if len(message) > 0:
                    logger.info('Inserting message as block...', terminal=True)
                    onionrblocks.insert(message, header='brd', expire=expireTime, meta={'ch': self.channel})

        logger.info("Flow is exiting, goodbye", terminal=True)
        return

    def showOutput(self):
        while type(self.channel) is type(None) and self.flowRunning:
            time.sleep(1)
        try:
            while self.flowRunning:
                for block in blockmetadb.get_blocks_by_type('brd'):
                    if block in self.alreadyOutputed:
                        continue
                    block = Block(block)
                    b_hash = bytesconverter.bytes_to_str(block.getHash())
                    if block.getMetadata('ch') != self.channel:
                        continue
                    if not self.flowRunning:
                        break
                    logger.info('\n------------------------', prompt = False, terminal=True)
                    content = block.getContent()
                    # Escape new lines, remove trailing whitespace, and escape ansi sequences
                    content = escapeansi.escape_ANSI(content.replace('\n', '\\n').replace('\r', '\\r').strip())
                    logger.info(block.getDate().strftime("%m/%d %H:%M") + ' - ' + logger.colors.reset + content, prompt = False, terminal=True)
                    self.alreadyOutputed.append(b_hash)
                time.sleep(5)
        except KeyboardInterrupt:
            self.flowRunning = False

def on_init(api, data = None):
    '''
        This event is called after Onionr is initialized, but before the command
        inputted is executed. Could be called when daemon is starting or when
        just the client is running.
    '''
    # Doing this makes it so that the other functions can access the api object
    # by simply referencing the variable `pluginapi`.
    global pluginapi
    pluginapi = api
    flow = OnionrFlow()
    return data

def on_processblocks(api, data=None):
    b_hash = reconstructhash.deconstruct_hash(data['block'].hash) # Get the 0-truncated block hash
    metadata = data['block'].bmetadata # Get the block metadata

    # Validate the channel name is sane for caching
    try:
        ch = metadata['ch']
    except KeyError:
        ch = 'global'
    ch_len = len(ch)
    if len(metadata['ch']) == 0:
        ch = 'global'
    elif len(metadata['ch']) > 12:
        return
    
    existing_posts = board_cache.get(ch)
    if existing_posts is None:
        existing_posts = ''
    else:
        existing_posts += ','
    check_list = existing_posts.split(',')
    if len(check_list) > 30:
        check_list.pop(0)
    existing_posts = ','.join(check_list)
    board_cache.put(ch, '%s%s' % (existing_posts, b_hash))
    board_cache.flush()