#!python3

# set mtime for handbrake mp4 files from filename

# https://github.com/hMatoba/Piexif
# http://ce3wiki.theturninggate.net/doku.php?id=file_name_convention
# destination: <BASE>/<year>/<YYYYMMDD> <Event>/ab-<YYYYMMDD>-<Event>-<nnnn>.jpg

from pathlib import Path
import datetime as dt
import piexif
from collections import defaultdict
import re
import os

DRY_RUN = False

def rename(old, new):
    print(old.name, "->", new.name)
    if not DRY_RUN:
        if not new.exists():
            old.rename(new)
        else:  
            print(f"skipped {old.name}, {new.name}, already exists")

src = Path(r'D:\Videos')
tim = Path(r'E:\MediaArchive\Andreas\RawByCamera\Panasonic HDC-SD99\20150412-20161209 Card\PRIVATE\AVCHD\BDMV\STREAM')

for raw in src.glob("*.m4v"):
    mo = re.match("(?P<seq>\d+)-\d+.m4v", raw.name)
    if mo is None:
        print(f"skipped {raw.name}, no match")
        continue
    md = mo.groupdict()
    mtsn = f"{md['seq']}.MTS"
    mts_ = list(tim.glob(mtsn))
    if len(mts_) != 1:
        print(f"skipped {mtsn}, no match")
        continue
    mts=mts_[0]
    stat = mts.stat()
    mtime = stat.st_mtime
    atime = stat.st_atime
    rawdt = dt.datetime.fromtimestamp(mtime)
    print(f"{raw.name} -> {rawdt}")
    if not DRY_RUN:
        os.utime(raw, (atime, mtime))
    fn = f"ab-{rawdt:%Y%m%d-%H%M%S}-Panasonic HDC_SD99{raw.suffix}"
    rename(raw, raw.parent / fn)