#!/usr/local/bin/python3
# coding: utf-8

# ytdlbot - utils.py
# 9/1/21 22:50
#

__author__ = "Benny <benny.think@gmail.com>"

import contextlib
import inspect as pyinspect
import logging
import os
import pathlib
import shutil
import subprocess
import tempfile
import time
import uuid

import coloredlogs
import ffmpeg
import psutil

from config import TMPFILE_PATH
from flower_tasks import app

inspect = app.control.inspect()


def apply_log_formatter():
    coloredlogs.install(
        level=logging.INFO,
        fmt="[%(asctime)s %(filename)s:%(lineno)d %(levelname).1s] %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )


def customize_logger(logger: list):
    for log in logger:
        logging.getLogger(log).setLevel(level=logging.INFO)


def sizeof_fmt(num: int, suffix="B"):
    for unit in ["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"]:
        if abs(num) < 1024.0:
            return "%3.1f%s%s" % (num, unit, suffix)
        num /= 1024.0
    return "%.1f%s%s" % (num, "Yi", suffix)


def is_youtube(url: str):
    if url.startswith("https://www.youtube.com/") or url.startswith("https://youtu.be/"):
        return True


def adjust_formats(user_id: int, url: str, formats: list, hijack=None):
    from database import MySQL

    # high: best quality 1080P, 2K, 4K, 8K
    # medium: 720P
    # low: 480P
    if hijack:
        formats.insert(0, hijack)
        return

    mapping = {"high": [], "medium": [720], "low": [480]}
    settings = MySQL().get_user_settings(user_id)
    if settings and is_youtube(url):
        for m in mapping.get(settings[1], []):
            formats.insert(0, f"bestvideo[ext=mp4][height={m}]+bestaudio[ext=m4a]")
            formats.insert(1, f"bestvideo[vcodec^=avc][height={m}]+bestaudio[acodec^=mp4a]/best[vcodec^=avc]/best")

    if settings[2] == "audio":
        formats.insert(0, "bestaudio[ext=m4a]")


def get_metadata(video_path):
    width, height, duration = 1280, 720, 0
    try:
        video_streams = ffmpeg.probe(video_path, select_streams="v")
        for item in video_streams.get("streams", []):
            height = item["height"]
            width = item["width"]
        duration = int(float(video_streams["format"]["duration"]))
    except Exception as e:
        logging.error(e)
    try:
        thumb = pathlib.Path(video_path).parent.joinpath(f"{uuid.uuid4().hex}-thunmnail.png").as_posix()
        ffmpeg.input(video_path, ss=duration / 2).filter("scale", width, -1).output(thumb, vframes=1).run()
    except ffmpeg._run.Error:
        thumb = None

    return dict(height=height, width=width, duration=duration, thumb=thumb)


def current_time(ts=None):
    return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(ts))


def get_revision():
    with contextlib.suppress(subprocess.SubprocessError):
        return subprocess.check_output("git -C ../ rev-parse --short HEAD".split()).decode("u8").replace("\n", "")
    return "unknown"


def get_func_queue(func) -> int:
    try:
        count = 0
        data = getattr(inspect, func)() or {}
        for _, task in data.items():
            count += len(task)
        return count
    except Exception:
        return 0


def tail_log(f, lines=1, _buffer=4098):
    """Tail a file and get X lines from the end"""
    # placeholder for the lines found
    lines_found = []

    # block counter will be multiplied by buffer
    # to get the block size from the end
    block_counter = -1

    # loop until we find X lines
    while len(lines_found) < lines:
        try:
            f.seek(block_counter * _buffer, os.SEEK_END)
        except IOError:  # either file is too small, or too many lines requested
            f.seek(0)
            lines_found = f.readlines()
            break

        lines_found = f.readlines()

        # we found enough lines, get out
        # Removed this line because it was redundant the while will catch
        # it, I left it for history
        # if len(lines_found) > lines:
        #    break

        # decrement the block counter to get the
        # next X bytes
        block_counter -= 1

    return lines_found[-lines:]


class Detector:
    def __init__(self, logs: str):
        self.logs = logs

    @staticmethod
    def func_name():
        with contextlib.suppress(Exception):
            return pyinspect.stack()[1][3]
        return "N/A"

    def updates_too_long_detector(self):
        # If you're seeing this, that means you have logged more than 10 device
        # and the earliest account was kicked out. Restart the program could get you back in.
        indicators = [
            "types.UpdatesTooLong",
            "Got shutdown from remote",
            "Code is updated",
            "OSError: Connection lost",
            "[Errno -3] Try again",
            "MISCONF",
        ]
        for indicator in indicators:
            if indicator in self.logs:
                logging.critical("kick out crash: %s", self.func_name())
                return True
        logging.debug("No crash detected.")

    def next_salt_detector(self):
        text = "Next salt in"
        if self.logs.count(text) >= 5:
            logging.critical("Next salt crash: %s", self.func_name())
            return True

    def connection_reset_detector(self):
        text = "Send exception: ConnectionResetError Connection lost"
        if text in self.logs:
            logging.critical("connection lost: %s ", self.func_name())
            return True


def auto_restart():
    log_path = "/var/log/ytdl.log"
    if not os.path.exists(log_path):
        return
    with open(log_path) as f:
        logs = "".join(tail_log(f, lines=100))

    det = Detector(logs)
    method_list = [getattr(det, func) for func in dir(det) if func.endswith("_detector")]
    for method in method_list:
        if method():
            logging.critical("%s bye bye world!☠️", method)
            for item in pathlib.Path(TMPFILE_PATH or tempfile.gettempdir()).glob("ytdl-*"):
                shutil.rmtree(item, ignore_errors=True)
            time.sleep(5)
            psutil.Process().kill()


def clean_tempfile():
    for item in pathlib.Path(TMPFILE_PATH or tempfile.gettempdir()).glob("ytdl-*"):
        if time.time() - item.stat().st_ctime > 3600:
            shutil.rmtree(item, ignore_errors=True)


if __name__ == "__main__":
    auto_restart()