#! /usr/bin/env python

import datetime
import ipdb
import os
import pickle
import random
import requests
import stackprinter
import sys

from config import Config
from dbconfig import engine, Session, scoped_session
from helpers import (
    format_display_name,
    index_ojects_by_parameter,
    send_mail,
)
from helpers import show_OK
from log import log
from mastodon import Mastodon
from models import (
    Accounts,
    Attachments,
    Base,
    Hashtags,
    Posts,
    PostTags,
)

from typing import List, Optional

from PyQt5.QtCore import Qt
from PyQt5.QtGui import (
    QImage,
    QPixmap,
)
from PyQt5.QtWidgets import (
    QApplication,
    QLabel,
    QMainWindow,
    QPushButton,
)

from ui.main_window_ui import Ui_MainWindow                 # type: ignore

TESTDATA = "/home/kae/git/urma/hometl.pickle"

# Mastodon.create_app(
#     'urma',
#     api_base_url='mastodon.org.uk',
#     to_file='urma_clientcred.secret'
# )

# API_BASE_URL = 'mastodon.org.uk'

# mastodon = Mastodon(client_id = 'urma_clientcred.secret',)
# mastodon.log_in('kae@midnighthax.com', '^ZUaiC8P6vLV49',
#   to_file='urma_usercred.secret')


class MastodonAPI:
    def __init__(self, access_token: str) -> None:
        """
        Initialise access to Mastodon
        """

        self.mastodon = Mastodon(access_token=access_token)
        self.me = self.mastodon.me()

    def get_account_following(self):
        """
        Return a list of account_dicts that we are following
        """

        page1 = self.mastodon.account_following(self.me.id)

        return self.mastodon.fetch_remaining(page1)

    def get_hashtag_following(self):
        """
        Return a list of hashtag_dicts that we are following
        """

        page1 = self.mastodon.tag_following(self.me.id)

        return self.mastodon.fetch_remaining(page1)


class Window(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None) -> None:
        super().__init__(parent)
        self.setupUi(self)

        self.mastapi = MastodonAPI(Config.ACCESS_TOKEN)
        self.update_db()

        self.current_post_id = None
        self.next_post = self.next

        self.btnDislike.clicked.connect(self.dislike)
        self.btnFirst.clicked.connect(self.first)
        self.btnLast.clicked.connect(self.last)
        self.btnLike.clicked.connect(self.like)
        self.btnNext.clicked.connect(self.next)
        self.btnPrev.clicked.connect(self.prev)
        self.btnUnsure.clicked.connect(self.unsure)

        # Show first record
        self.next()

    def display(self, session: Session, post: Posts) -> None:
        """
        Prepare to display post
        """

        boosted_by = None
        if post.boosted_post_id:
            boosted_by = post.account
            while post.boosted_post_id:
                post = session.get(Posts, post.boosted_post_id)
        self._display(session, post, boosted_by)

    def _display(self, session: Session, post: int,
                 boosted_by: Optional[Accounts] = None) -> None:
        """
        Display passed post
        """

        if post is None:
            return

        # Boosted
        if boosted_by:
            self.txtBoosted.setText(
                "Boosted by: " + format_display_name(boosted_by))
            self.txtBoosted.show()
        else:
            self.txtBoosted.hide()

        # Username
        self.txtUsername.setText(format_display_name(post.account))

        # Debug
        self.lblDebug.setText(str(post.id))

        # Account
        self.lblAcct.setText(post.account.acct)

        # Hashtags
        unfollowed_hashtags = [
            '#' + a.name for a in post.hashtags if not a.followed]
        followed_hashtags = [
            '#' + a.name for a in post.hashtags if a.followed]
        hashtag_text = (
            '<span style="color:' + Config.FOLLOWED_COLOUR + '">' +
            '<br />'.join(followed_hashtags) +
            '</span><br />' +
            '<span style="color:' + Config.NORMAL_COLOUR + '">' +
            '<br />'.join(unfollowed_hashtags) +
            '</span>'
        )
        self.txtHashtags.setText(hashtag_text)

        # Post
        self.txtPost.setHtml(post.content)

        # Image
        if post.media_attachments:
            # TODO: handle multiple images, not just [0]
            url_image = post.media_attachments[0].preview_url
            pixmap = QPixmap()
            pixmap.loadFromData(requests.get(url_image).content)
            s_pixmap = pixmap.scaled(self.lblPicture.size(),
                                     Qt.KeepAspectRatio)
            self.lblPicture.show()
            self.lblPicture.setPixmap(s_pixmap)
        else:
            self.lblPicture.hide()

    def dislike(self):
        """
        Mark a post as rated negatively
        """

        self.rate_post(rating=-1)

    def first(self):
        """
        actions
        """

        pass

    def last(self):
        """
        actions
        """

        pass

    def like(self):
        """
        Mark a post as rated positively
        """

        self.rate_post(rating=1)

    def next(self) -> None:
        """
        Display next post. We work BACKWARDS through posts, starting with the
        most recent, so "next" is actually one older.

        If we are called with self.current_post_id set to None, retrieve and
        display newest unrated post.
        """

        # Remember whether we're going forward or backwards through
        # posts
        self.next_post = self.next

        # Get post to display
        with Session() as session:
            if self.current_post_id is None:
                post = Posts.get_unrated_newest(session)
            else:
                post = Posts.get_unrated_before(session, self.current_post_id)
            # Don't process posts that are boosted as they will be
            # processed by the boosting post
            while post and post.reblogged_by_post:
                post = Posts.get_unrated_before(session, post.post_id)
            if not post:
                self.current_post_id = None
                show_OK("All done", "No more posts to process")
                return

            self.current_post_id = post.post_id
            self.display(session, post)

    def prev(self):
        """
        Display previous post. We work BACKWARDS through posts so
        "previous" is actually one newer.

        If we are called with self.current_post_id set to None, retrieve and
        display oldest unrated post.
        """

        # Remember whether we're going forward or backwards through
        # posts
        self.next_post = self.prev

        # Get post to display, but don't process posts that are boosted
        # as they will be processed by the boosting post
        with Session() as session:
            if self.current_post_id is None:
                post = Posts.get_unrated_oldest(session)
            else:
                post = Posts.get_unrated_after(session, self.current_post_id)
            # Don't process posts that are boosted as they will be
            # processed by the boosting post
            while post and post.reblogged_by_post:
                post = Posts.get_unrated_after(session, post.post_id)
            if not post:
                self.current_post_id = None
                show_OK("All done", "No more posts to process")
                return

            self.current_post_id = post.post_id
            self.display(session, post)

    def rate_post(self, rating: int) -> None:
        """
        Add rating to current post
        """

        with Session() as session:
            post = Posts.get_by_post_id(session, self.current_post_id)
            post.rating = rating
        self.next_post()

    def unsure(self):
        """
        Mark a post as rated neutrally
        """

        self.rate_post(rating=0)

    def update_db(self) -> None:
        """
        Update database from Mastodon

        Save a copy of downloaded data for debugging
        """

        with Session() as session:
            minimum_post_id = Posts.max_post_id(session)
            if not minimum_post_id:
                minimum_post_id = "1"
            posts_to_get = Config.MAX_POSTS_TO_FETCH
            reached_minimum = False
            hometl = []

            while True:

                # Create a filename to save data
                now = datetime.datetime.now()
                seq = 0
                while True:
                    fname = (
                        "testdata/" +
                        now.strftime("%Y-%m-%d_%H:%M:%S_") +
                        f"{seq:02d}.pickle"
                    )
                    if not os.path.isfile(fname):
                        print(f"{fname=}")
                        break
                    seq += 1
                    print(f"{seq=}")

                # Fetch data
                if not hometl:
                    print("Fetching first data...")
                    hometl = self.mastapi.mastodon.timeline()
                else:
                    print("Fetching next data...")
                    hometl = self.mastapi.mastodon.fetch_next(hometl)
                    print(f"Fetched additional {len(hometl)} posts")
                with open(fname, "wb") as f:
                    pickle.dump(hometl, f)

                for post in hometl:
                    if str(post.id) <= minimum_post_id:
                        reached_minimum = True
                        break
                    print(f"Processing {post.id=}")
                    self._process_post(session, post)

                posts_to_get -= len(hometl)
                print(f"{posts_to_get=}")
                if posts_to_get <= 0 or reached_minimum or not hometl:
                    break

    def _process_post(self, session: Session, post) -> Posts:
        """
        Add passsed post to database
        """

        log.debug(f"{post.id=} processing")
        rec = Posts.get_or_create(session, str(post.id))
        if rec.account_id is not None:
            # We already have this post
            log.debug(f"{post.id=} already in db")
            return rec

        # Create account record if needed
        log.debug(f"{post.id=} processing {post.account.id=}")
        account_rec = Accounts.get_or_create(session, str(post.account.id))
        if account_rec.username is None:
            log.debug(f"{post.id=} populating new account {post.account.id=}")
            account_rec.username = post.account.username
            account_rec.acct = post.account.acct
            account_rec.display_name = post.account.display_name
            account_rec.bot = post.account.bot
            account_rec.url = post.account.url
        rec.account_id = account_rec.id

        # Create hashtag records as needed
        for tag in post.tags:
            log.debug(f"{post.id=} processing {tag.name=}")
            hashtag = Hashtags.get_or_create(session, tag.name, tag.url)
            rec.hashtags.append(hashtag)

        # Handle media
        if post.media_attachments:
            for media in post.media_attachments:
                log.debug(f"{post.id=} processing {media.id=}")
                media_rec = Attachments.get_or_create(
                    session, str(media.id), rec.id)
                if not media_rec.type:
                    log.debug(f"{post.id=} {media.id=} new record")
                    media_rec.type = media.type
                    media_rec.url = media.url
                    media_rec.preview_url = media.preview_url
                    media_rec.description = media.description
                else:
                    log.debug(f"{post.id=} {media.id=} already exists")
        else:
            log.debug(f"{post.id=} No media attachments")

        rec.account_id = account_rec.id
        rec.created_at = post.created_at
        rec.uri = post.uri
        rec.url = post.url
        rec.content = post.content[:Config.MAX_CONTENT_LENGTH]
        log.debug(f"{post.id=} {post.content=}")

        if post.reblog:
            log.debug(f"{post.id=} {post.reblog.id=}")
            rec.boosted_post_id = self._process_post(
                session, post.reblog).id
            log.debug(f"{post.id=} {rec.boosted_post_id=}")

        return rec

    def update_followed_accounts(self, session: Session) -> None:
        """
        Retrieve list of followed accounts and update accounts
        in database to match
        """

        mast_followed_accounts = self.mastapi.get_account_following()
        mast_followed_accounts_d = index_ojects_by_parameter(
            mast_followed_accounts, "username")

        our_followed_accounts = Accounts.get_followed(session)
        our_followed_accounts_d = index_ojects_by_parameter(
            our_followed_accounts, "username")

        # Add those we are missing
        for username in (
            set(mast_followed_accounts_d.keys()) -
            set(our_followed_accounts_d.keys())
                ):
            account = Accounts.get_or_create(
                session, str(mast_followed_accounts_d[username].id)
            )
            account.followed = True

        # Remove any we no longer follow
        for username in (
            set(our_followed_accounts_d.keys()) -
            set(mast_followed_accounts_d.keys())
        ):
            account = Accounts.get_or_create(
                session, str(our_followed_accounts_d[username].account_id)
            )
            account.followed = False

    def update_followed_hashtags(self, session: Session) -> None:
        """
        Retrieve list of followed hashtags and update hashtags
        """

        mast_followed_hashtags = self.mastapi.get_hashtag_following()
        mast_followed_hashtags_d = index_ojects_by_parameter(
            mast_followed_hashtags, "name")

        our_followed_hashtags = Hashtags.get_followed(session)
        our_followed_hashtags_d = index_ojects_by_parameter(
            our_followed_hashtags, "name")

        # Add those we are missing
        for name in (
            set(mast_followed_hashtags_d.keys()) -
            set(our_followed_hashtags_d.keys())
                ):
            hashtag = Hashtags.get_or_create(
                session, name, mast_followed_hashtags_d[name].url)
            hashtag.followed = True

        # Remove any we no longer follow
        for name in (
            set(our_followed_hashtags_d.keys()) -
            set(mast_followed_hashtags_d.keys())
        ):
            hashtag = hashtags.get_or_create(
                session, name, our_followed_hashtags_d[username].name)
            hashtag.followed = False


# class HoldingPot:
#     def process_post(post):


if __name__ == "__main__":
    """
    If command line arguments given, carry out requested function and
    exit. Otherwise run full application.
    """

    try:
        Base.metadata.create_all(engine)
        app = QApplication(sys.argv)
        win = Window()
        win.show()
        sys.exit(app.exec())
    except Exception as exc:

        if os.environ["URMA_ENV"] != "DEVELOPMENT":
            msg = stackprinter.format(exc)
            send_mail(Config.ERRORS_TO, Config.ERRORS_FROM,
                      "Exception from urma", msg)

        print("\033[1;31;47mUnhandled exception starts")
        stackprinter.show(style="darkbg")
        print("Unhandled exception ends\033[1;37;40m")

# # Data for development
# with open(TESTDATA, "rb") as inp:
#     hometl = pickle.load(inp)
#
# with Session() as session:
#     for post in hometl:
#         process_post(post)