#!/usr/bin/env python3

import argparse
from pathlib import Path
from string import Template
import subprocess
from typing import Callable, Dict, Optional
import urllib.parse as url


def cmd_player_play(video_uri: str, start: Optional[str] = None):
    print(f"Play video {video_uri}")
    subprocess.Popen(
        args = [e for e in [
            str(Path("~/bin/mpvadd").expanduser()),
            video_uri,
            f"start={start}" if start is not None else None,
        ] if e is not None],
        stdin = subprocess.DEVNULL,
        stdout = subprocess.DEVNULL,
        stderr = subprocess.DEVNULL,
    )

URI_SCHEME = "entertainment-decider"
URI_COMMANDS = {
    "player": {
        "play": cmd_player_play
    }
}

def execute_uri_command(uri: str):
    parts = url.urlparse(uri, scheme=URI_SCHEME, allow_fragments=False)
    if parts.scheme != URI_SCHEME:
        if parts.scheme in {"http", "https"}:
            return cmd_player_play(uri)
        raise Exception(f"Cannot parse URI's with scheme {parts.scheme!r}")
    path = parts.path.strip("/").split("/")
    options = dict(url.parse_qsl(parts.query))
    def unknown_cmd():
        raise Exception(f"Unknown command {parts.path}")
    current = URI_COMMANDS
    for path_name in path:
        if callable(current) or path_name not in current:
            unknown_cmd()
        current = current[path_name]
    if not callable(current):
        unknown_cmd()
    return current(**options)


def misc_generate_desktop():
    with Path("./entry.desktop").open("r") as fh:
        temp = Template(fh.read())
    print(temp.substitute(name="Entertainment Decider", exec_path=str(Path(__file__).resolve())))

MISC_COMMANDS: Dict[str, Callable] = {
    "generate-desktop-file": misc_generate_desktop,
}

def execute_misc_cmd(cmd: str):
    if cmd not in MISC_COMMANDS:
        raise Exception(f"Unknown misc command {cmd!r}")
    return MISC_COMMANDS[cmd]()

def main():
    parser = argparse.ArgumentParser(prog="entertainment-decider")
    subparsers = parser.add_subparsers()
    # uri parser
    uri_parser = subparsers.add_parser("exec")
    uri_parser.add_argument("uri", type=str)
    uri_parser.set_defaults(parser_cmd=execute_uri_command)
    # misc parser
    misc_parser = subparsers.add_parser("misc")
    misc_parser.add_argument("cmd", type=str, choices=list(MISC_COMMANDS.keys()))
    misc_parser.set_defaults(parser_cmd=execute_misc_cmd)
    # parse args
    args = parser.parse_args()
    cmd = args.parser_cmd
    d = vars(args)
    del d["parser_cmd"]
    cmd(**d)

if __name__ == "__main__":
    main()