import json
import shlex
from pathlib import Path
from typing import Any

from dzgui.const.boilerplate import config_boilerplate


"""
Convert legacy dztuirc to config.json
"""


class UnsupportedKey(Exception):
    pass


def str2bool(string: str) -> bool:
    s = string.lower()
    match s:
        case "":
            return False
        case "0":
            return False
        case "1" | "2":
            return True
        case "false":
            return False
        case "true":
            return True
        case _:
            raise UnsupportedKey(f"The key {s} is not a valid config key.")


def rc2json(file: Path) -> str:
    with open(file, "r") as f:
        lex = shlex.shlex(f.read())
        lex.whitespace += "="

    keys: dict[str, Any] = {}
    ips: list[str] = []

    toggles = ["fullscreen"]
    deprecated = [
        "api_key",
        "staging_dir",
        "src_path",
        "steam_path",
        "debug",
        "branch",
        "auto_install",
    ]

    while True:
        tok = lex.get_token()
        ntok = lex.get_token()
        value: str | bool

        if ntok is not None:
            ntok = ntok.strip('""')
            value = ntok

        if tok in deprecated:
            continue
        elif tok in toggles:
            if ntok is not None:
                value = str2bool(ntok)
        elif tok == "preferred_client":
            tok = "client"
        elif tok == "ip_list":
            while True:
                ntok = lex.get_token()
                if ntok is not None:
                    ntok = ntok.strip('""')
                    value = ntok
                if ntok == ")":
                    break
                # TODO: make test for this
                # NOTE: strip malformed records from ancient config file versions
                if ntok is not None:
                    if len(ntok.split(":")) == 3 and ntok.split(":")[2] != "":
                        ips.append(ntok)
            continue

        if not tok:
            break

        keys[tok] = value

    keys["ip_list"] = ips
    keys["use_miles"] = False
    keys["start_tab"] = 0
    # NOTE: workaround for DZGUI 6 logic (see #375)
    for key in config_boilerplate.keys():
        if key not in keys:
            keys[key] = config_boilerplate[key]
    return json.dumps(keys, indent=2)