#!/usr/bin/env python

"""Helper script to upload pics to my photoblog."""

import argparse
import os.path
import re
import subprocess
from urllib.request import Request, urlopen
from base64 import b64decode

HOSTNAME = b64decode(b'aW50cm92ZXJ0bnVkaXN0LmNvbQ==').decode()
USERNAME = b64decode(b'Ym9pY3VkaQ==').decode()
RE_FILENAME = re.compile(r'^(\d{2}\w{2}\d{3})[^\d]?.*?\.(gif|jpg|png)$')

def main(args):
    # Map original files to short basenames.
    file_map = dict()
    for name in args.files:
        basename = os.path.basename(name)
        if args.custom:
            file_map[name] = basename
            continue

        m = RE_FILENAME.match(name)
        if not m:
            print(f"File '{name}' doesn't match usual naming convention. Use --custom to upload custom file names.")
            quit()

        file_map[name] = f"{m.group(1)}.{m.group(2)}"

    print(f"Going to photoblog: {list(file_map.values())}")

    # Test each file doesn't already exist.
    not_existing = list()
    if not args.lazy:
        print(f"Checking each file isn't already uploaded...")
        problems = False
        for name in file_map.values():
            test_url = f'https://{HOSTNAME}/static/photos/{name}'
            req = Request(test_url, method='HEAD')

            try:
                resp = urlopen(req, timeout=10)
                status = resp.status if hasattr(resp, 'status') else resp.getstatus()
                if status == 200:
                    print(f"Warning: file '{name}' already existed at '{test_url}' and won't be uploaded without --lazy")
                    problems = True
            except:
                not_existing.append(name)
                pass

        print(f"New files not found on the blog: {not_existing}")

        if problems:
            quit()

    print("Looks good! Sending to server...")
    if args.test:
        print("NOTE: Test run (--test), not actually uploading")

    for ours, theirs in file_map.items():
        cmd = ["scp", ours, f"{USERNAME}@{HOSTNAME}:www/static/photos/{theirs}"]
        print("Exec:", " ".join(cmd))
        if not args.test:
            subprocess.run(cmd)


if __name__ == "__main__":
    parser = argparse.ArgumentParser("to-photoblog")
    parser.add_argument("--custom", "-c",
        action="store_true",
        help="Upload files with custom names as-is without validation",
    )
    parser.add_argument("--lazy", "-l",
        action="store_true",
        help="Don't validate the image was already uploaded, just upload it",
    )
    parser.add_argument("--test", "-t",
        action="store_true",
        help="Test run; do not actually upload files",
    )
    parser.add_argument("files",
        type=str,
        nargs='+',
        help='Files to upload, should be in my naming convention',
    )

    args = parser.parse_args()
    main(args)