# coding: utf-8
from __future__ import print_function, unicode_literals

import os
import tempfile
from datetime import datetime

from .__init__ import CORES
from .authsrv import VFS, AuthSrv
from .bos import bos
from .th_cli import ThumbCli
from .th_srv import TH_CH
from .util import UTC, vjoin, vol_san

TAR_NO_OPUS = set("aac|m4a|mp3|oga|ogg|opus|wma".split("|"))


class StreamArc(object):
    def __init__(
        self,
        log ,
        asrv ,
        fgen    ,
        **kwargs 
    ):
        self.log = log
        self.asrv = asrv
        self.args = asrv.args
        self.fgen = fgen
        self.stopped = False

    def gen(self)    :
        raise Exception("override me")

    def stop(self)  :
        self.stopped = True


def gfilter(
    fgen    ,
    thumbcli ,
    uname ,
    vtop ,
    fmt ,
)     :
    from concurrent.futures import ThreadPoolExecutor

    pend = []
    with ThreadPoolExecutor(max_workers=CORES) as tp:
        try:
            for f in fgen:
                task = tp.submit(enthumb, thumbcli, uname, vtop, f, fmt)
                pend.append((task, f))
                if pend[0][0].done() or len(pend) > CORES * 4:
                    task, f = pend.pop(0)
                    try:
                        f = task.result(600)
                    except:
                        pass
                    yield f

            for task, f in pend:
                try:
                    f = task.result(600)
                except:
                    pass
                yield f
        except Exception as ex:
            thumbcli.log("gfilter flushing ({})".format(ex))
            for task, f in pend:
                try:
                    task.result(600)
                except:
                    pass
            thumbcli.log("gfilter flushed")


def enthumb(
    thumbcli , uname , vtop , f  , fmt 
)   :
    rem = f["vp"]
    ext = rem.rsplit(".", 1)[-1].lower()
    if (fmt == "mp3" and ext == "mp3") or (fmt == "opus" and ext in TAR_NO_OPUS):
        raise Exception()

    vp = vjoin(vtop, rem.split("/", 1)[1])
    vn, rem = thumbcli.asrv.vfs.get(vp, uname, True, False)
    dbv, vrem = vn.get_dbv(rem)
    thp = thumbcli.get(dbv, vrem, f["st"].st_mtime, fmt)
    if not thp:
        raise Exception()

    ext = fmt if fmt == "wav" else TH_CH.get(fmt[:1], fmt)
    sz = bos.path.getsize(thp)
    st  = f["st"]
    ts = st.st_mtime
    f["ap"] = thp
    f["vp"] = f["vp"].rsplit(".", 1)[0] + "." + ext
    f["st"] = os.stat_result((st.st_mode, -1, -1, 1, 1000, 1000, sz, ts, ts, ts))
    return f


def errdesc(
    vfs , errors  
)    :
    report = ["copyparty failed to add the following files to the archive:", ""]

    for fn, err in errors:
        report.extend([" file: %r" % (fn,), "error: %s" % (err,), ""])

    btxt = "\r\n".join(report).encode("utf-8", "replace")
    btxt = vol_san(list(vfs.all_vols.values()), btxt)

    with tempfile.NamedTemporaryFile(prefix="copyparty-", delete=False) as tf:
        tf_path = tf.name
        tf.write(btxt)

    dt = datetime.now(UTC).strftime("%Y-%m%d-%H%M%S")

    bos.chmod(tf_path, 0o444)
    return {
        "vp": "archive-errors-{}.txt".format(dt),
        "ap": tf_path,
        "st": bos.stat(tf_path),
    }, report
