from __future__ import unicode_literals

import os
import re
import subprocess
import time

from .common import FileDownloader
from ..compat import compat_str
from ..utils import (
    check_executable,
    encodeFilename,
    encodeArgument,
    get_exe_version,
)


def rtmpdump_version():
    return get_exe_version(
        "rtmpdump", ["--help"], r"(?i)RTMPDump\s*v?([0-9a-zA-Z._-]+)"
    )


class RtmpFD(FileDownloader):
    def real_download(self, filename, info_dict):
        def run_rtmpdump(args):
            start = time.time()
            resume_percent = None
            resume_downloaded_data_len = None
            proc = subprocess.Popen(args, stderr=subprocess.PIPE)
            cursor_in_new_line = True
            proc_stderr_closed = False
            try:
                while not proc_stderr_closed:
                    # read line from stderr
                    line = ""
                    while True:
                        char = proc.stderr.read(1)
                        if not char:
                            proc_stderr_closed = True
                            break
                        if char in [b"\r", b"\n"]:
                            break
                        line += char.decode("ascii", "replace")
                    if not line:
                        # proc_stderr_closed is True
                        continue
                    mobj = re.search(
                        r"([0-9]+\.[0-9]{3}) kB / [0-9]+\.[0-9]{2} sec \(([0-9]{1,2}\.[0-9])%\)",
                        line,
                    )
                    if mobj:
                        downloaded_data_len = int(float(mobj.group(1)) * 1024)
                        percent = float(mobj.group(2))
                        if not resume_percent:
                            resume_percent = percent
                            resume_downloaded_data_len = downloaded_data_len
                        time_now = time.time()
                        eta = self.calc_eta(
                            start,
                            time_now,
                            100 - resume_percent,
                            percent - resume_percent,
                        )
                        speed = self.calc_speed(
                            start,
                            time_now,
                            downloaded_data_len - resume_downloaded_data_len,
                        )
                        data_len = None
                        if percent > 0:
                            data_len = int(downloaded_data_len * 100 / percent)
                        self._hook_progress(
                            {
                                "status": "downloading",
                                "downloaded_bytes": downloaded_data_len,
                                "total_bytes_estimate": data_len,
                                "tmpfilename": tmpfilename,
                                "filename": filename,
                                "eta": eta,
                                "elapsed": time_now - start,
                                "speed": speed,
                            }
                        )
                        cursor_in_new_line = False
                    else:
                        # no percent for live streams
                        mobj = re.search(
                            r"([0-9]+\.[0-9]{3}) kB / [0-9]+\.[0-9]{2} sec", line
                        )
                        if mobj:
                            downloaded_data_len = int(float(mobj.group(1)) * 1024)
                            time_now = time.time()
                            speed = self.calc_speed(
                                start, time_now, downloaded_data_len
                            )
                            self._hook_progress(
                                {
                                    "downloaded_bytes": downloaded_data_len,
                                    "tmpfilename": tmpfilename,
                                    "filename": filename,
                                    "status": "downloading",
                                    "elapsed": time_now - start,
                                    "speed": speed,
                                }
                            )
                            cursor_in_new_line = False
                        elif self.params.get("verbose", False):
                            if not cursor_in_new_line:
                                self.to_screen("")
                            cursor_in_new_line = True
                            self.to_screen("[rtmpdump] " + line)
            finally:
                proc.wait()
            if not cursor_in_new_line:
                self.to_screen("")
            return proc.returncode

        url = info_dict["url"]
        player_url = info_dict.get("player_url")
        page_url = info_dict.get("page_url")
        app = info_dict.get("app")
        play_path = info_dict.get("play_path")
        tc_url = info_dict.get("tc_url")
        flash_version = info_dict.get("flash_version")
        live = info_dict.get("rtmp_live", False)
        conn = info_dict.get("rtmp_conn")
        protocol = info_dict.get("rtmp_protocol")
        real_time = info_dict.get("rtmp_real_time", False)
        no_resume = info_dict.get("no_resume", False)
        continue_dl = self.params.get("continuedl", True)

        self.report_destination(filename)
        tmpfilename = self.temp_name(filename)
        test = self.params.get("test", False)

        # Check for rtmpdump first
        if not check_executable("rtmpdump", ["-h"]):
            self.report_error(
                'RTMP download detected but "rtmpdump" could not be run. Please install it.'
            )
            return False

        # Download using rtmpdump. rtmpdump returns exit code 2 when
        # the connection was interrupted and resuming appears to be
        # possible. This is part of rtmpdump's normal usage, AFAIK.
        basic_args = ["rtmpdump", "--verbose", "-r", url, "-o", tmpfilename]
        if player_url is not None:
            basic_args += ["--swfVfy", player_url]
        if page_url is not None:
            basic_args += ["--pageUrl", page_url]
        if app is not None:
            basic_args += ["--app", app]
        if play_path is not None:
            basic_args += ["--playpath", play_path]
        if tc_url is not None:
            basic_args += ["--tcUrl", tc_url]
        if test:
            basic_args += ["--stop", "1"]
        if flash_version is not None:
            basic_args += ["--flashVer", flash_version]
        if live:
            basic_args += ["--live"]
        if isinstance(conn, list):
            for entry in conn:
                basic_args += ["--conn", entry]
        elif isinstance(conn, compat_str):
            basic_args += ["--conn", conn]
        if protocol is not None:
            basic_args += ["--protocol", protocol]
        if real_time:
            basic_args += ["--realtime"]

        args = basic_args
        if not no_resume and continue_dl and not live:
            args += ["--resume"]
        if not live and continue_dl:
            args += ["--skip", "1"]

        args = [encodeArgument(a) for a in args]

        self._debug_cmd(args, exe="rtmpdump")

        RD_SUCCESS = 0
        RD_FAILED = 1
        RD_INCOMPLETE = 2
        RD_NO_CONNECT = 3

        started = time.time()

        try:
            retval = run_rtmpdump(args)
        except KeyboardInterrupt:
            if not info_dict.get("is_live"):
                raise
            retval = RD_SUCCESS
            self.to_screen("\n[rtmpdump] Interrupted by user")

        if retval == RD_NO_CONNECT:
            self.report_error("[rtmpdump] Could not connect to RTMP server.")
            return False

        while retval in (RD_INCOMPLETE, RD_FAILED) and not test and not live:
            prevsize = os.path.getsize(encodeFilename(tmpfilename))
            self.to_screen("[rtmpdump] Downloaded %s bytes" % prevsize)
            time.sleep(5.0)  # This seems to be needed
            args = basic_args + ["--resume"]
            if retval == RD_FAILED:
                args += ["--skip", "1"]
            args = [encodeArgument(a) for a in args]
            retval = run_rtmpdump(args)
            cursize = os.path.getsize(encodeFilename(tmpfilename))
            if prevsize == cursize and retval == RD_FAILED:
                break
            # Some rtmp streams seem abort after ~ 99.8%. Don't complain for those
            if prevsize == cursize and retval == RD_INCOMPLETE and cursize > 1024:
                self.to_screen(
                    "[rtmpdump] Could not download the whole video. This can happen for some advertisements."
                )
                retval = RD_SUCCESS
                break
        if retval == RD_SUCCESS or (test and retval == RD_INCOMPLETE):
            fsize = os.path.getsize(encodeFilename(tmpfilename))
            self.to_screen("[rtmpdump] Downloaded %s bytes" % fsize)
            self.try_rename(tmpfilename, filename)
            self._hook_progress(
                {
                    "downloaded_bytes": fsize,
                    "total_bytes": fsize,
                    "filename": filename,
                    "status": "finished",
                    "elapsed": time.time() - started,
                }
            )
            return True
        else:
            self.to_stderr("\n")
            self.report_error("rtmpdump exited with code %d" % retval)
            return False
