import logging
import mimetypes
import os
import sys

from appdirs import user_data_dir
from datetime import datetime

from lbrynet.core.Error import InsufficientFundsError
from lbrynet.lbryfilemanager.LBRYFileCreator import create_lbry_file
from lbrynet.lbryfile.StreamDescriptor import publish_sd_blob
from lbrynet.core.PaymentRateManager import PaymentRateManager
from lbrynet.core.LBRYMetadata import Metadata, CURRENT_METADATA_VERSION
from lbrynet.lbryfilemanager.LBRYFileDownloader import ManagedLBRYFileDownloader
from lbrynet.reflector.client import LBRYFileReflectorClientFactory
from lbrynet.conf import LOG_FILE_NAME
from twisted.internet import threads, defer

if sys.platform != "darwin":
    log_dir = os.path.join(os.path.expanduser("~"), ".lbrynet")
else:
    log_dir = user_data_dir("LBRY")

if not os.path.isdir(log_dir):
    os.mkdir(log_dir)

lbrynet_log = os.path.join(log_dir, LOG_FILE_NAME)
log = logging.getLogger(__name__)


class Publisher(object):
    def __init__(self, session, lbry_file_manager, wallet):
        self.session = session
        self.lbry_file_manager = lbry_file_manager
        self.wallet = wallet
        self.received_file_name = False
        self.file_path = None
        self.file_name = None
        self.publish_name = None
        self.bid_amount = None
        self.verified = False
        self.lbry_file = None
        self.txid = None
        self.stream_hash = None
        self.reflector_client = None
        self.metadata = {}

    def start(self, name, file_path, bid, metadata, old_txid):

        def _show_result():
            log.info("Published %s --> lbry://%s txid: %s", self.file_name, self.publish_name, self.txid)
            return defer.succeed(self.txid)

        self.publish_name = name
        self.file_path = file_path
        self.bid_amount = bid
        self.metadata = metadata
        self.old_txid = old_txid

        d = self._check_file_path(self.file_path)
        d.addCallback(lambda _: create_lbry_file(self.session, self.lbry_file_manager,
                                                 self.file_name, open(self.file_path)))
        d.addCallback(self.add_to_lbry_files)
        d.addCallback(lambda _: self._create_sd_blob())
        d.addCallback(lambda _: self._claim_name())
        d.addCallback(lambda _: self.set_status())
        d.addCallback(lambda _: self.start_reflector())
        d.addCallbacks(lambda _: _show_result(), self._show_publish_error)

        return d

    def start_reflector(self):
        self.reflector_client = LBRYFileReflectorClientFactory(self.session.blob_manager,
                                                               self.lbry_file_manager.stream_info_manager,
                                                               self.stream_hash)

    def _check_file_path(self, file_path):
        def check_file_threaded():
            f = open(file_path)
            f.close()
            self.file_name = os.path.basename(self.file_path)
            return True
        return threads.deferToThread(check_file_threaded)

    def set_lbry_file(self, lbry_file_downloader):
        self.lbry_file = lbry_file_downloader
        return defer.succeed(None)

    def add_to_lbry_files(self, stream_hash):
        self.stream_hash = stream_hash
        prm = PaymentRateManager(self.session.base_payment_rate_manager)
        d = self.lbry_file_manager.add_lbry_file(stream_hash, prm)
        d.addCallback(self.set_lbry_file)
        return d

    def _create_sd_blob(self):
        d = publish_sd_blob(self.lbry_file_manager.stream_info_manager, self.session.blob_manager,
                            self.lbry_file.stream_hash)

        def set_sd_hash(sd_hash):
            if 'sources' not in self.metadata:
                self.metadata['sources'] = {}
            self.metadata['sources']['lbry_sd_hash'] = sd_hash

        d.addCallback(set_sd_hash)
        return d

    def set_status(self):
        d = self.lbry_file_manager.change_lbry_file_status(self.lbry_file, ManagedLBRYFileDownloader.STATUS_FINISHED)
        d.addCallback(lambda _: self.lbry_file.restore())
        return d

    def _claim_name(self):
        self.metadata['content-type'] = mimetypes.guess_type(os.path.join(self.lbry_file.download_directory,
                                                                          self.lbry_file.file_name))[0]
        self.metadata['ver'] = CURRENT_METADATA_VERSION

        if self.old_txid:

            d = self.wallet.abandon_name(self.old_txid)
            d.addCallback(lambda tx: log.info("Abandoned tx %s" % str(tx)))
            d.addCallback(lambda _: self.wallet.claim_name(self.publish_name,
                                       self.bid_amount,
                                       Metadata(self.metadata)))
        else:
            d = self.wallet.claim_name(self.publish_name,
                                       self.bid_amount,
                                       Metadata(self.metadata))
        def set_tx_hash(txid):
            self.txid = txid

        d.addCallback(set_tx_hash)
        return d

    def _show_publish_error(self, err):
        log.info(err.getTraceback())
        message = "An error occurred publishing %s to %s. Error: %s."
        if err.check(InsufficientFundsError):
            error_message = "Insufficient funds"
        else:
            error_message = err.getErrorMessage()

        log.error(error_message)
        log.error(message, str(self.file_name), str(self.publish_name), err.getTraceback())

        return defer.succeed(error_message)