#!/usr/bin/env python3
import argparse
import json
import sys
from pathlib import Path
from subprocess import check_output

CONFIG = Path.home() / ".config" / "git-ids.json"


def load() -> dict[str, list[str]]:
    if not CONFIG.is_file():
        return {}
    return json.loads(CONFIG.read_text())


def store(d: dict[str, list[str]]):
    CONFIG.parent.mkdir(parents=True, exist_ok=True)
    CONFIG.write_text(json.dumps(d, indent=2))
    print("Saved.")
    

def cmd_get(args: argparse.Namespace):
    n = load().get(args.alias)
    if n is None:
        exit(128)
    print("\n".join(n))


def cmd_add(args: argparse.Namespace):
    store({args.alias: [args.name, args.email], **load()})


def cmd_add_all(_):
    f = load()
    log = check_output('git log --pretty="%an%n%ae%n%n"', shell=True).decode().strip().split("\n\n")
    log = {tuple(l.strip().split('\n')) for l in log}
    log = {l for l in log if l not in f.values()}
    print(log)
    
    # Filter out no-reply
    new_log = []
    for n, _ in log:
        same_name = [(n1, e) for n1, e in log if n1 == n]
        filtered = [(n, e) for n, e in same_name if "noreply.github.com" not in e]
        if len(filtered):
            new_log += filtered
        else:
            new_log += same_name
    log = new_log
    
    for l in log:
        a = input(f"Do you want {l} to be added?\nType in an alias if yes, otherwise type enter.\n> ").strip()
        if a:
            f[a] = l
    store(f)
    
    
def cmd_list(_):
    print("\n".join(f"{n}: {e[0]}, {e[1]}" for n, e in load().items()))


if __name__ == '__main__':
    raw_args = sys.argv[1:]
    if not raw_args:
        raw_args = ['-h']
    
    par = argparse.ArgumentParser("Git ID List")
    sp = par.add_subparsers()
    
    get = sp.add_parser("get", usage="Get an identity")
    get.set_defaults(handler=cmd_get)
    get.add_argument("alias", help="Alias of the author")
    
    add = sp.add_parser("add", usage="Add an identity")
    add.set_defaults(handler=cmd_add)
    add.add_argument("alias", help="Short alias of the author")
    add.add_argument("name", help="Name shown in git log")
    add.add_argument("email", help="Email shown in git log")

    add = sp.add_parser("add-all", usage="Ask to add each identity from current git log")
    add.set_defaults(handler=cmd_add_all)

    add = sp.add_parser("list", usage="List identities")
    add.set_defaults(handler=cmd_list)

    args = par.parse_args(raw_args)
    if hasattr(args, "handler"):
        args.handler(args)