#!/usr/bin/env python3

# IP address code taken from:
# https://github.com/rm-hull/luma.examples/blob/master/examples/sys_info_extended.py
#
# ----------------------------------------------------------------------------
# Copyright (c) 2024 Thomas Buck (thomas@xythobuz.de)
#
# 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.
#
# See <http://www.gnu.org/licenses/>.
# ----------------------------------------------------------------------------

import sys
import os
import random
import subprocess
import signal
import glob
import socket
from collections import OrderedDict
import time

import pisugar
from luma.core.interface.serial import i2c
from luma.core.render import canvas
from luma.oled.device import ssd1306
from luma.core.error import DeviceNotFoundError
import psutil
import RPi.GPIO as GPIO
from PIL import ImageFont

basevol = "70"
debouncems = 200

#fontfile = "/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf"
fontfile = "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"
fontsize = 11

LCD_REFRESH = 5.0

BTN_ARTIST = 16
BTN_NEXT = 26

currentplaying = None
lcd = None
font = None
bat = None
songlist = None
currentfile = None
lasttime = None

basedir = sys.argv[1]
if basedir.endswith("/"):
    basedir = basedir.removesuffix("/")

def get_artist(fn):
    parts = fn.replace(basedir + "/", "").split(os.sep)
    artist = parts[0].replace("_", " ")
    return artist

#originalsongs = os.listdir(basedir)
originalsongs = []
artists = []
for fn in glob.iglob(os.path.join(basedir, '**', '*.wav'), recursive=True):
    originalsongs.append(fn)

    artist = get_artist(fn)
    if artist not in artists:
        artists.append(artist)

random.shuffle(artists)
currentartist = artists[0]

def find_single_ipv4_address(addrs):
    for addr in addrs:
        if addr.family == socket.AddressFamily.AF_INET:  # IPv4
            return addr.address

def get_ipv4_address(interface_name=None):
    if_addrs = psutil.net_if_addrs()
    if isinstance(interface_name, str) and interface_name in if_addrs:
        addrs = if_addrs.get(interface_name)
        address = find_single_ipv4_address(addrs)
        return address if isinstance(address, str) else ""
    else:
        if_stats = psutil.net_if_stats()
        if_stats_filtered = {key: if_stats[key] for key, stat in if_stats.items() if "loopback" not in stat.flags}
        if_names_sorted = [stat[0] for stat in sorted(if_stats_filtered.items(), key=lambda x: (x[1].isup, x[1].duplex), reverse=True)]
        if_addrs_sorted = OrderedDict((key, if_addrs[key]) for key in if_names_sorted if key in if_addrs)
        for _, addrs in if_addrs_sorted.items():
            address = find_single_ipv4_address(addrs)
            if isinstance(address, str):
                return address
        return ""

def status(filename):
    try:
        with canvas(lcd) as draw:
            f = filename.replace(".wav", "")
            f = f.replace(basedir + "/", "")
            f = f.replace("/", "\n")
            f = f.replace("_", " ")

            f += "\n\n"
            f += "Bat: {:.0f}% {:.2f}V {:.2f}A".format(bat.get_battery_level(), bat.get_battery_voltage(), bat.get_battery_current())

            ip = get_ipv4_address()
            if len(ip) > 0:
                f += "\n"
                f += "IP: %s" % (ip)

            with open("/proc/asound/card0/pcm0p/sub0/hw_params", "r") as rf:
                for line in rf:
                    if line.startswith("rate:"):
                        rate = int(line.split(" ")[1])

                        f += "\n"
                        f += "Rate: {:.0f}kHz".format(rate / 1000)

            draw.multiline_text((0, 0), f, font=font, fill="white", spacing=-1)
    except Exception as e:
        raise e

def stop():
    global currentplaying

    if running():
        try:
            print("Stopping running player")
            os.kill(currentplaying.pid, signal.SIGINT)
            if not currentplaying.poll():
                currentplaying = None
            else:
                print("Error stopping player")
        except ProcessLookupError as e:
            currentplaying = None
    else:
        currentplaying = None

def play(filename):
    global currentplaying
    global lcd
    global basedir
    global bat
    global currentfile

    stop()

    print('Now playing "' + filename + '"')
    currentfile = filename
    status(currentfile)

    currentplaying = subprocess.Popen(["ffplay", "-hide_banner", "-nostats", "-nodisp", "-autoexit", "-volume", basevol, filename])

def running():
    global currentplaying

    if currentplaying != None:
        if currentplaying.poll() == None:
            return True
    return False

def playlist():
    global songlist
    global lasttime

    if not running():
        while True:
            if (songlist == None) or (len(songlist) <= 0):
                switch_artist()
                songlist = originalsongs.copy()
                random.shuffle(songlist)

            song = songlist.pop()
            artist = get_artist(song)
            if artist == currentartist:
                play(song)
                lasttime = time.time()
                break
    else:
        if (time.time() - lasttime) >= LCD_REFRESH:
            status(currentfile)
            lasttime = time.time()

def switch_artist():
    global artists
    global currentartist

    ca = currentartist
    while currentartist == ca:
        random.shuffle(artists)
        currentartist = artists[0]

    switch_track()

def switch_track():
    stop()

def button(ch):
    val = not GPIO.input(ch)

    #name = "Unknown"
    #if ch == BTN_ARTIST:
    #    name = "BTN_ARTIST"
    #elif ch == BTN_NEXT:
    #    name = "BTN_NEXT"
    #print(name + " is now " + str(val))

    if val:
        if ch == BTN_ARTIST:
            switch_artist()
        elif ch == BTN_NEXT:
            switch_track()

def main():
    global lcd
    global font
    global bat
    global currentfile

    if len(sys.argv) <= 1:
        print("Usage:")
        print("\t" + sys.argv[0] + " PATH")
        sys.exit(1)

    os.system("killall ffplay")

    GPIO.setmode(GPIO.BCM)
    for b in [ BTN_ARTIST, BTN_NEXT ]:
        GPIO.setup(b, GPIO.IN, pull_up_down=GPIO.PUD_UP)
        GPIO.add_event_detect(b, GPIO.BOTH, callback=button, bouncetime=debouncems)

    try:
        bus = i2c(port=1, address=0x3C)
        lcd = ssd1306(bus)
        font = ImageFont.truetype(fontfile, fontsize)
    except DeviceNotFoundError as E:
        print("No LCD connected")
        lcd = None

    conn, event_conn = pisugar.connect_tcp()
    bat = pisugar.PiSugarServer(conn, event_conn)
    print(bat.get_model() + " " + bat.get_version())
    print(str(bat.get_battery_level()) + "% " + str(bat.get_battery_voltage()) + "V " + str(bat.get_battery_current()) + "A")
    print("Plug=" + str(bat.get_battery_power_plugged()) + " Charge=" + str(bat.get_battery_charging()))

    try:
        while True:
            playlist()
            time.sleep(0.05)
    except KeyboardInterrupt:
        print("Bye")
        GPIO.cleanup()
        sys.exit(0)

if __name__ == "__main__":
    main()