from __future__ import annotations

from pathlib import Path
from typing import Any

from django.conf import settings
from django.core.management.base import BaseCommand, CommandError

from pobsync.config.load import load_global_config, load_host_config
from pobsync.paths import PobsyncPaths
from pobsync_backend.models import GlobalConfig, HostConfig


class Command(BaseCommand):
    help = "Import pobsync YAML configs into the Django database."

    def add_arguments(self, parser) -> None:
        parser.add_argument("--prefix", default=settings.POBSYNC_HOME, help="Pobsync home directory")

    def handle(self, *args: Any, **options: Any) -> None:
        paths = PobsyncPaths(home=Path(options["prefix"]))
        if not paths.global_config_path.exists():
            raise CommandError(f"Missing global config: {paths.global_config_path}")

        global_cfg = load_global_config(paths.global_config_path)
        global_ssh = global_cfg.get("ssh") or {}
        global_rsync = global_cfg.get("rsync") or {}
        global_defaults = global_cfg.get("defaults") or {}
        retention_defaults = global_cfg.get("retention_defaults") or {}
        GlobalConfig.objects.update_or_create(
            name="default",
            defaults={
                "backup_root": global_cfg["backup_root"],
                "pobsync_home": global_cfg.get("pobsync_home", str(paths.home)),
                "ssh_user": global_ssh.get("user") or "root",
                "ssh_port": global_ssh.get("port") or 22,
                "ssh_options": global_ssh.get("options") or [],
                "rsync_binary": global_rsync.get("binary") or "rsync",
                "rsync_args": global_rsync.get("args") or [],
                "rsync_extra_args": global_rsync.get("extra_args") or [],
                "rsync_timeout_seconds": global_rsync.get("timeout_seconds") or 0,
                "rsync_bwlimit_kbps": global_rsync.get("bwlimit_kbps") or 0,
                "default_source_root": global_defaults.get("source_root") or "/",
                "default_destination_subdir": global_defaults.get("destination_subdir") or "",
                "excludes_default": global_cfg.get("excludes_default") or [],
                "retention_daily": retention_defaults.get("daily", 14),
                "retention_weekly": retention_defaults.get("weekly", 8),
                "retention_monthly": retention_defaults.get("monthly", 12),
                "retention_yearly": retention_defaults.get("yearly", 0),
                "data": global_cfg,
            },
        )

        count = 0
        for host_path in sorted(paths.hosts_dir.glob("*.yaml")):
            host_cfg = load_host_config(host_path)
            host_ssh = host_cfg.get("ssh") or {}
            host_rsync = host_cfg.get("rsync") or {}
            host_retention = host_cfg.get("retention") or {}
            HostConfig.objects.update_or_create(
                host=host_cfg["host"],
                defaults={
                    "address": host_cfg["address"],
                    "ssh_user": host_ssh.get("user") or "",
                    "ssh_port": host_ssh.get("port"),
                    "source_root": host_cfg.get("source_root") or "",
                    "includes": host_cfg.get("includes") or [],
                    "excludes_add": host_cfg.get("excludes_add") or [],
                    "excludes_replace": host_cfg.get("excludes_replace"),
                    "rsync_extra_args": host_rsync.get("extra_args") or [],
                    "retention_daily": host_retention.get("daily", 14),
                    "retention_weekly": host_retention.get("weekly", 8),
                    "retention_monthly": host_retention.get("monthly", 12),
                    "retention_yearly": host_retention.get("yearly", 0),
                    "config": host_cfg,
                    "enabled": True,
                },
            )
            count += 1

        self.stdout.write(self.style.SUCCESS(f"Imported global config and {count} host config(s)."))