#! /usr/bin/env python

# python imports
import argparse
import logging
import math
import datetime
import os
import os.path
import sys

# 3rd party imports
from escpos.printer import Usb, File
import feedparser
import ignition
from PIL import Image
import re
import requests

from config import load_config, CONFIG_PATH
from webdav import Client


# Enable logging
logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
                    level=logging.INFO)

logger = logging.getLogger(__name__)

config = {}


class SmallPrint:
    def __init__(self, gen_qr=False):
        """
        Initializes the printer and returns a printer object to
        generate the print
        """
        self.gen_qr = gen_qr
        self.config = load_config()
        if not self.config:
            print(f"Config file created, check {CONFIG_PATH}")

        if os.path.exists(self.config.get("PRINTER_FILE")):
            self.printer = File(self.config.get("PRINTER_FILE"))

        else:
            printer_id = self.config.get("PRINTER_USB_ID")

            if not printer_id:
                logger.error("Please configure your printer")

            prid1, prid2 = printer_id.split(":")

            printer_interface = config.get("PRINTER_INTERFACE") or 0
            printer_endpoint = config.get("PRINTER_ENDPOINT") or 0x01

            printer = Usb(prid1, prid2, printer_interface, printer_endpoint)
            printer.charcode(code="WEST_EUROPE")
            self.printer = printer


    def reset_defaults(self):
        """
        Reset the printer to the defaults
        """
        self.printer.set(align='left', font='a', width=1, text_type="normal",
                    height=1, density=9, invert=False, smooth=False, flip=False)


    def print_weather(self, city=None):
        """
        Gets a weather report and sends it to the printer
        with a nice icon and data, on the city specified
        or the default in the config
        """
        # Get our printer
        printer = self.printer

        # Get it on the right shape for printing
        self.reset_defaults()

        # Get OpenWeatherMap key
        appkey = self.config.get("OWM")
        if not appkey:
            logger.error("Open Weather key not set!")
            return

        if not city:
            city = self.config.get("CITY")

        if not city:
            logger.error("No city set")
            return

        params = {"q": city, "APPID": appkey, "units": "metric"}

        weatherdata = requests.get('http://api.openweathermap.org/data/2.5/weather', params=params)

        if "weather" in weatherdata.json():
            weather = weatherdata.json()
            today = datetime.datetime.now()
            current_day = today.strftime("%a, %d %b, %Y")

            printer.set(align="center",
                        font="a",
                        text_type="b")
            printer.text(f"{current_day}\n\n{city}\n")

            self.reset_defaults()
            printer.set(align="center", font="b")

            description = weather['weather'][0]['description']
            printer.text(f"{description}\n\n")
            icon_code = weather['weather'][0]['icon']

            dir_path = os.path.dirname(os.path.realpath(__file__))   # Get this file's current directory

            if not os.path.exists(os.path.join(dir_path, "icons/weather")):
                dir_path = "/usr/share/smallprint/icons/weather"

            else:
                dir_path = os.path.join(dir_path, "icons/weather")

            if not os.path.exists(os.path.join(dir_path, f"{icon_code}.png")):
                icon_path = os.path.join(dir_path, "any.png")

            else:
                icon_path = os.path.join(dir_path, f"{icon_code}.png")

            # TODO: The image impl should be an option
            printer.image(icon_path,
                        impl="bitImageColumn")
            printer.text("\n")
            # TODO: Print a nice icon based on the codes here: https://openweathermap.org/weather-conditions
            temperature = weather['main']['temp']
            humidity = weather['main']['humidity']
            wind = weather['wind']['speed']

            printer.text(f"Temperature: {temperature}C\n")
            printer.text(f"Humidity: {humidity}%\n")
            printer.text(f"Wind: {wind}km\\h\n")

        else:
            logger.error("No weather info available")

    def print_gemini(self, link):
        """
        Given a Gemini link, it prints the file to the printer
        and tries to do some interpretation if it is gemtext
        """
        printer = self.printer
        response = ignition.request(link)

        if not response.success():
            logger.error(f"Received error {response.status}")
            return

        self.reset_defaults()
        if response.meta == "text/gemini":
            for raw_line in str(response.data()).split("\n"):
                line = raw_line.rstrip()
                if len(line) == 0:
                    printer.text("\n")
                    continue

                if line.startswith("# "):
                    printer.set(align="left",
                                text_type="BU",
                                width=2, height=2,
                                smooth=True)
                    printer.text(line[2:])

                elif line.startswith("## "):
                    printer.set(align="left",
                                text_type="BU",
                                width=1, height=1,
                                smooth=True)
                    printer.text(line[3:])

                elif line.startswith("### "):
                    printer.set(align="left",
                                font="a",
                                text_type="U",
                                width=1, height=1,
                                smooth=True)
                    printer.text(line[4:])

                elif line.startswith("#### "):
                    printer.set(align="left",
                                font="b",
                                text_type="U",
                                width=1, height=1,
                                smooth=True)
                    printer.text(line[5:])

                elif line.startswith("=>"):
                    self.reset_defaults()
                    if generate_qr:
                        printer.set(align="left",
                                    font="b")
                        printer.text(line[3:])
                        self.reset_defaults()
                        lnk = self._process_link(link, line[3:])
                        printer.text("\n")
                        printer.qr(lnk, size=6)

                    else:
                        printer.set(align="left",
                                    font="b",
                                    text_type="U")
                        printer.text(line)
                        printer.text("\n")

                else:
                    printer.set(align="left",
                                font="b")
                    printer.text(line)

                printer.text("\n")

        else:
            printer.text(response.data())

    def _process_link(self, orig_link, link_text):
        """
        Extracts the link from the text, and completes it if
        necessary
        """
        uri = link_text.split()[0]

        if "://" in link_text:
            return uri

        if link_text.startswith("/"):
            return orig_link + link_text

        else:
            return orig_link + "/" + link_text

    def print_rss(self, link, news=3):
        """
        Given an RSS link and a printer, prints the news from it
        """
        printer = self.printer
        self.reset_defaults()
        feed = feedparser.parse(link)
        title = feed["channel"].get("title", link)[:16]

        printer.set(align="center",
                    text_type="BU",
                    width=2, height=2,
                    smooth=True)

        printer.text(f"{title}\n\n")
        self.reset_defaults()
        items = feed["items"][:news]
        for item in items:
            self._print_rss_item(item)

    def _print_rss_item(self, item):
        """
        Process an item from an RSS feed and print it out
        """
        printer = self.printer

        title = item.get("title", "")
        date = item["published"]
        text = clear_html(item["summary"])
        if len(text) > 255:
            # Limit the text output in certain "summaries"
            text = text[:252] + "...\n"
        link = item["link"]

        printer.set(align="center",
                    text_type="BU",
                    smooth=True)
        printer.text(f"{title}\n")
        self.reset_defaults()
        printer.set(align="left",
                    font="b")
        printer.text(f"{date}\n\n")
        printer.text(text)
        printer.text("\n")

        if self.gen_qr:
            printer.qr(link, size=6)
            printer.text("\n")

    def print_text(self, text):
        """
        Prints a text in the smallest form possible
        """
        printer = self.printer

        self.reset_defaults()
        # Set the font to a small one and align to
        # the left
        printer.set(align="left",
                    text_type="NORMAL",
                    font="b",
                    smooth=True)
        printer.text("\n")
        if text.strip() == "-":
            # Load stdin data
            for line in sys.stdin:
                printer.text(line)

        printer.text(text)

    def print_empty_lines(self, lines=2):
        """
        Generates several \n depending on lines to create
        empty spaces in the ticket printed
        """
        linebreaks = "\n" * lines
        self.printer.text(linebreaks)

    def print_file(self, file):
        """
        Prints a file
        """
        printer = self.printer
        self.reset_defaults()
        # Set the font to a small one and align to
        # the left
        printer.set(align="left",
                    text_type="NORMAL",
                    font="b",
                    smooth=True)

        printer.text("\n")

        for line in file:
            printer.text(line)

        file.close()

    def print_image(self, image):
        """
        Prints an image
        """
        printer = self.printer
        # Load the image to adjust it
        im = Image.open(image)

        ratio = float(im.size[0]) / float(im.size[1])

        if im.size[0] > im.size[1]:
            # The image needs to be rotated
            width = math.floor(384 * ratio)
            im = im.resize((width, 384))
            im = im.transpose(Image.ROTATE_90)

        else:
            height = math.floor(384.0 / ratio)
            im = im.resize((384, height))

        im.save("temp.png")
        printer.hw("INIT")
        printer.image("temp.png")
        os.remove("temp.png")

    def print_calendar(self):
        """
        Connects to a webdav calendar and retrieves
        the events for today
        """
        printer = self.printer
        c = Client(self.config)
        events = c.get_todays_events()

        printer.set(align="center",
                    text_type="BU",
                    smooth=True)
        printer.text("Today:\n")

        printer.set(align="left",
                    text_type="NORMAL",
                    font="b",
                    smooth=True)

        if len(events) > 0:
            for event in events:
                hour = event[1].hour
                minutes = event[1].minute
                if minutes < 10:
                    printer.text(f"{hour}:0{minutes}\n")

                else:
                    printer.text(f"{hour}:{minutes}\n")

                printer.text(f"{event[0]}\n--\n")

        else:
            printer.set(align="center",
                        text_type="NORMAL",
                        font="b",
                        smooth=True)
            printer.text("No events today\n")

    def printing_script(self):
        """
        Gets the configuration and parses its script
        """
        printer = self.printer
        script = self.config.get("SCRIPT")

        if not script:
            logger.error("No script in config file")
            return

        for command in script:
            key = list(command)[0]
            value = command[key]
            if key == 'WEATHER':
                self.print_weather(city=value)

            if key == 'RSS':
                self.print_rss(value)

            if key == 'GEMINI':
                self.print_gemini(value)

            if key == 'FILE':
                self.print_file(value)

            if key == 'IMAGE':
                self.print_image(value)

            if key == 'TEXT':
                self.print_text(value)
                printer.text('\n')

            if key == 'CALENDAR':
                self.print_calendar()

            printer.set(align="center",
                        text_type="NORMAL",
                        font="b",
                        smooth=True)
            printer.text("-----\n")


def clear_html(text):
    cleanr = re.compile('<.*?>|&([a-z0-9]+|#[0-9]{1,6}|#x[0-9a-f]{1,6});')
    cleantext = re.sub(cleanr, '', text)
    return cleantext


def create_parser():
    """
    Create an argpaser for command line interaction
    """
    parser = argparse.ArgumentParser()

    parser.add_argument("--weather", default=False, help="Prints the weather in the given city")
    parser.add_argument("--news", default=False, help="Loads a RSS or ATOM feed and prints it out")
    parser.add_argument("--gemini", default=False, help="Loads a Gemini url and prints it out")
    parser.add_argument("--text", nargs=1, default=None, help="Print the given text, use '-' to read from stdin")
    parser.add_argument("--file", default=None, type=open, help="Loads a file and sends it to the printer (as text)")
    parser.add_argument("--image", nargs=1, default=None, help="Print an image")
    parser.add_argument("--calendar", action="store_true", help="Print configured calendar events for today")
    parser.add_argument("--genqr", action="store_true", help="Activates the generation of QR codes for links in news and gemini")

    return parser


if __name__ == "__main__":

    parser = create_parser()
    args = parser.parse_args()

    generate_qr = args.genqr

    printer = SmallPrint(generate_qr)

    ops_called = 0

    if args.text:
        ops_called += 1
        printer.print_text(args.text[0])
        printer.print_empty_lines(2)

    if args.file:
        ops_called += 1
        printer.print_file(args.file)
        printer.print_empty_lines(2)

    if args.weather:
        ops_called += 1
        printer.print_weather(args.weather)
        printer.print_empty_lines(2)

    if args.gemini:
        ops_called += 1
        printer.print_gemini(args.gemini)
        printer.print_empty_lines(2)

    if args.news:
        ops_called += 1
        printer.print_rss(args.news, gen_qr=generate_qr)

    if args.image:
        ops_called += 1
        printer.print_image(args.image[0])
        printer.print_empty_lines(2)

    if args.calendar:
        ops_called += 1
        printer.print_calendar(printer)
        printer.print_empty_lines(2)

    # In case we get called (almost) empty
    if ops_called == 0:
        # Try to parse a config script
        printer.printing_script()
        printer.print_empty_lines(2)