# sb-builder - GUI configuration
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

"""GUI configuration: built-in defaults overlaid by the user's TOML file."""

import copy
import os
import tomllib

DEFAULTS = {
    "remote": {"target": "buildsystem", "ssh_options": []},
    "refresh": {"dashboard": 30, "jobs": 5},
    "notify": {"enabled": True, "events": ["finished", "failed", "killed", "lost", "vm-up"]},
    "vm": {"libvirt_uri": "qemu:///system", "domain": "buildsystem", "autostart": False},
    "builds": {"publish": True},
}


def path():
    base = os.environ.get("XDG_CONFIG_HOME") or os.path.expanduser("~/.config")
    return os.path.join(base, "sb-builder", "config.toml")


def load(p=None):
    """Return (config, error). On any problem: the defaults plus the error text."""
    p = p or path()
    try:
        with open(p, "rb") as f:
            data = tomllib.load(f)
    except FileNotFoundError:
        return copy.deepcopy(DEFAULTS), None
    except (OSError, tomllib.TOMLDecodeError) as e:
        return copy.deepcopy(DEFAULTS), f"{p}: {e}"
    cfg = copy.deepcopy(DEFAULTS)
    for sec, keys in data.items():
        if sec not in DEFAULTS or not isinstance(keys, dict):
            return copy.deepcopy(DEFAULTS), f"{p}: unknown section [{sec}]"
        for k, v in keys.items():
            if k not in DEFAULTS[sec]:
                return copy.deepcopy(DEFAULTS), f"{p}: unknown key {sec}.{k}"
            want = type(DEFAULTS[sec][k])
            if type(v) is not want:
                return copy.deepcopy(DEFAULTS), f"{p}: {sec}.{k}: expected {want.__name__}"
            cfg[sec][k] = v
    return cfg, None