from __future__ import annotations

from typing import Any

from django.core.exceptions import ObjectDoesNotExist

from pobsync.config.schemas import GLOBAL_SCHEMA, HOST_SCHEMA
from pobsync.validate import validate_dict

from .models import GlobalConfig, HostConfig


class ConfigRepositoryError(RuntimeError):
    pass


def _global_runtime_data(global_config: GlobalConfig) -> dict[str, Any]:
    data = {
        "backup_root": global_config.backup_root,
        "ssh": {
            "user": global_config.ssh_user,
            "port": global_config.ssh_port,
            "options": list(global_config.ssh_options or []),
        },
        "rsync": {
            "binary": global_config.rsync_binary,
            "args": list(global_config.rsync_args or []),
            "timeout_seconds": global_config.rsync_timeout_seconds,
            "bwlimit_kbps": global_config.rsync_bwlimit_kbps,
            "extra_args": list(global_config.rsync_extra_args or []),
        },
        "defaults": {
            "source_root": global_config.default_source_root,
            "destination_subdir": global_config.default_destination_subdir,
        },
        "excludes_default": list(global_config.excludes_default or []),
        "retention_defaults": {
            "daily": global_config.retention_daily,
            "weekly": global_config.retention_weekly,
            "monthly": global_config.retention_monthly,
            "yearly": global_config.retention_yearly,
        },
    }
    return validate_dict(data, GLOBAL_SCHEMA, path="global")


def _host_runtime_data(host_config: HostConfig) -> dict[str, Any]:
    data: dict[str, Any] = {
        "host": host_config.host,
        "address": host_config.address,
        "includes": list(host_config.includes or []),
        "retention": {
            "daily": host_config.retention_daily,
            "weekly": host_config.retention_weekly,
            "monthly": host_config.retention_monthly,
            "yearly": host_config.retention_yearly,
        },
    }
    if host_config.ssh_user or host_config.ssh_port:
        data["ssh"] = {}
        if host_config.ssh_user:
            data["ssh"]["user"] = host_config.ssh_user
        if host_config.ssh_port is not None:
            data["ssh"]["port"] = host_config.ssh_port
    if host_config.source_root:
        data["source_root"] = host_config.source_root
    if host_config.excludes_replace is not None:
        data["excludes_replace"] = list(host_config.excludes_replace or [])
    else:
        data["excludes_add"] = list(host_config.excludes_add or [])
    if host_config.rsync_extra_args or host_config.rsync_bwlimit_kbps is not None:
        data["rsync"] = {}
        if host_config.rsync_extra_args:
            data["rsync"]["extra_args"] = list(host_config.rsync_extra_args or [])
        if host_config.rsync_bwlimit_kbps is not None:
            data["rsync"]["bwlimit_kbps"] = host_config.rsync_bwlimit_kbps
    return validate_dict(data, HOST_SCHEMA, path="host")


def global_config_object_data(global_config: GlobalConfig) -> dict[str, Any]:
    return _global_runtime_data(global_config)


def host_config_object_data(host_config: HostConfig) -> dict[str, Any]:
    return _host_runtime_data(host_config)


def global_config_data(name: str = "default") -> dict[str, Any]:
    try:
        global_config = GlobalConfig.objects.get(name=name)
    except ObjectDoesNotExist as exc:
        raise ConfigRepositoryError(f"Missing global config {name!r}") from exc
    return _global_runtime_data(global_config)


def host_config_data(host: str) -> dict[str, Any]:
    try:
        host_config = HostConfig.objects.get(host=host, enabled=True)
    except ObjectDoesNotExist as exc:
        raise ConfigRepositoryError(f"Missing enabled host {host!r}") from exc
    return _host_runtime_data(host_config)