import json
import os
import subprocess
import warnings
from datetime import datetime, timedelta
from typing import IO

from config import VIDEO_CLIP_EACH_SEC, VIDEO_CLIP_OVERFLOW_SEC, VIDEO_OUTPUT_DIR, \
    FFMPEG_EXEC, HANDBRAKE_EXEC, HANDBRAKE_PRESET_FILE, HANDBRAKE_PRESET, HANDBRAKE_ENCOPT
from . import LOGGER


def base_ts_to_filename(start_ts: float, is_mp4=False) -> str:
    base_start = datetime.fromtimestamp(start_ts)
    if is_mp4:
        return base_start.strftime("%Y%m%d_%H%M.mp4")
    else:
        return base_start.strftime("%Y%m%d_%H%M.flv")


def get_video_real_duration(filename):
    ffmpeg_process = subprocess.Popen([
        FFMPEG_EXEC, *_common_ffmpeg_setting(), "-i", filename, "-c", "copy", "-f", "null", "-"
    ], stdout=subprocess.PIPE)
    return handle_ffmpeg_output(ffmpeg_process.stdout)


def encode_video_with_subtitles(orig_filename: str, subtitles: list[str], base_ts: float):
    create_dt = datetime.fromtimestamp(base_ts)
    current_dt = (create_dt).strftime("%Y%m%d_%H%M_")
    process = get_encode_process_use_handbrake(orig_filename,
                                                   subtitles,
                                                   os.path.join(VIDEO_OUTPUT_DIR, "{}.mp4".format(current_dt)))
    handle_handbrake_output(process.stdout)
    process.wait()
    return [{
            "base_path": VIDEO_OUTPUT_DIR,
            "file": "{}.mp4".format(current_dt),
        }]


def get_encode_process_use_handbrake(orig_filename: str, subtitles: list[str], new_filename: str):
    print("[+]Use HandBrakeCli")
    encode_process = subprocess.Popen([
        HANDBRAKE_EXEC, *_common_handbrake_setting(),
        "--preset-import-file", HANDBRAKE_PRESET_FILE, "--preset", HANDBRAKE_PRESET,
        "-i", orig_filename, "-x", HANDBRAKE_ENCOPT,
        "--ssa-file", ",".join(i for i in subtitles),
        "--ssa-burn", ",".join("%d" % (i+1) for i in range(len(subtitles))),
        "-o",
        new_filename
    ], stdout=subprocess.PIPE)
    return encode_process



def handle_handbrake_output(stdout: IO[bytes]):
    out_time = "0:0:0.0"
    speed = "0"
    if stdout is None:
        print("[!]STDOUT is null")
        return
    json_body = ""
    json_start = False
    _i = 0
    while True:
        line = stdout.readline()
        if line == b"":
            break
        if json_start:
            json_body += line.strip().decode("UTF-8")
            if line.startswith(b"}"):
                json_start = False
                status_payload = json.loads(json_body)
                if status_payload["State"] == "WORKING":
                    out_time = "ETA: {Hours:02d}:{Minutes:02d}:{Seconds:02d}".format_map(status_payload["Working"])
                    speed = "{Rate:.2f}FPS".format_map(status_payload["Working"])
                    _i += 1
                    if _i % 300 == 150:
                        LOGGER.debug("[>]Speed:{}@{}".format(out_time, speed))
                elif status_payload["State"] == "WORKDONE":
                    break
            continue
        if line.startswith(b"Progress:"):
            json_start = True
            json_body = "{"
    LOGGER.debug("[ ]Speed:{}@{}".format(out_time, speed))


def handle_ffmpeg_output(stdout: IO[bytes]) -> str:
    out_time = "0:0:0.0"
    speed = "0"
    if stdout is None:
        print("[!]STDOUT is null")
        return out_time
    _i = 0
    while True:
        line = stdout.readline()
        if line == b"":
            break
        if line.strip() == b"progress=end":
            # 处理完毕
            break
        if line.startswith(b"out_time="):
            out_time = line.replace(b"out_time=", b"").decode().strip()
        if line.startswith(b"speed="):
            speed = line.replace(b"speed=", b"").decode().strip()
            _i += 1
            if _i % 300 == 150:
                LOGGER.debug("[>]Speed:{}@{}".format(out_time, speed))
    LOGGER.debug("[ ]Speed:{}@{}".format(out_time, speed))
    return out_time


def duration_str_to_float(duration_str) -> float:
    _duration = datetime.strptime(duration_str, "%H:%M:%S.%f") - datetime(1900, 1, 1)
    return _duration.total_seconds()


def quick_split_video(file):
    warnings.warn("已过时", DeprecationWarning)
    if not os.path.isfile(file):
        raise FileNotFoundError(file)
    file_name = os.path.split(file)[-1]
    _create_dt = os.path.splitext(file_name)[0]
    create_dt = datetime.strptime(_create_dt[:13], "%Y%m%d_%H%M")
    _duration_str = get_video_real_duration(file)
    duration = duration_str_to_float(_duration_str)
    current_sec = 0
    _video_parts = []
    while current_sec < duration:
        if (current_sec + VIDEO_CLIP_OVERFLOW_SEC * 2) > duration:
            print("[-]Less than 2 overflow sec, skip")
            break
        current_dt = (create_dt + timedelta(seconds=current_sec)).strftime("%Y%m%d_%H%M_")
        print("CUR_DT", current_dt)
        print("BIAS_T", current_sec)
        split_process = subprocess.Popen([
            FFMPEG_EXEC, *_common_ffmpeg_setting(),
            "-ss", str(current_sec),
            "-i", file, "-c:v", "copy", "-c:a", "copy", "-f", "mp4",
            "-t", str(VIDEO_CLIP_EACH_SEC + VIDEO_CLIP_OVERFLOW_SEC),
            "-fflags", "+genpts", "-shortest", "-movflags", "faststart",
            os.path.join(VIDEO_OUTPUT_DIR, "{}.mp4".format(current_dt))
        ], stdout=subprocess.PIPE)
        handle_ffmpeg_output(split_process.stdout)
        split_process.wait()
        _video_parts.append({
            "base_path": VIDEO_OUTPUT_DIR,
            "file": "{}.mp4".format(current_dt),
        })
        current_sec += VIDEO_CLIP_EACH_SEC
    return _video_parts


def _common_ffmpeg_setting():
    return (
        "-y", "-hide_banner", "-progress", "-", "-loglevel", "error",
    )


def _common_handbrake_setting():
    return (
        "--json",
        "--crop-mode", "none", "--no-comb-detect", "--no-bwdif", "--no-decomb", "--no-detelecine", "--no-hqdn3d",
        "--no-nlmeans", "--no-chroma-smooth", "--no-unsharp", "--no-lapsharp", "--no-deblock", "--align-av"
    )