"""Service packages installation and OpenRC configuration."""


import shutil
from pathlib import Path

from .utils import info, success, error, run, emerge


# Packages to emerge for system services
SERVICE_PACKAGES = [
    # System essentials
    "app-admin/sysklogd",
    "sys-process/cronie",
    # Network
    "net-misc/networkmanager",
    "net-misc/chrony",
    "net-firewall/iptables",
    # Bluetooth
    "net-wireless/bluez",
    "net-wireless/blueman",
    # Desktop services
    "sys-fs/udisks",
    "sys-power/power-profiles-daemon",
    "sys-auth/rtkit",
    # Display manager
    "x11-misc/sddm",
    "gui-libs/display-manager-init",
    # Containers
    "app-containers/podman",
    "app-containers/podman-compose",
    "app-containers/podman-tui",
    # Backup
    "app-backup/snapper",
]

# OpenRC boot runlevel services
BOOT_SERVICES = [
    "dbus",
    "elogind",
    "dmcrypt",
]

# OpenRC default runlevel services
DEFAULT_SERVICES = [
    "sysklogd",
    "sshd",
    "NetworkManager",
    "chronyd",
    "cronie",
    "power-profiles-daemon",
    "display-manager",
    "bluetooth",
    "iptables",
    "ip6tables",
]


def emerge_services() -> None:
    """Emerge service packages."""
    info("=== Emerging Service Packages ===")

    print()
    info("Packages to install:")
    for pkg in SERVICE_PACKAGES:
        print(f"  - {pkg}")
    print()

    emerge(*SERVICE_PACKAGES)

    success("Service packages installed.")


def configure_display_manager() -> None:
    """Configure SDDM as the display manager."""
    info("=== Configuring Display Manager ===")

    dm_conf = Path("/etc/conf.d/display-manager")

    if dm_conf.exists():
        content = dm_conf.read_text()

        # Check if already configured correctly (idempotency)
        if 'DISPLAYMANAGER="sddm"' in content:
            info("SDDM already configured as display manager")
            return

        # Update existing config
        lines = content.split("\n")
        new_lines = []
        found = False

        for line in lines:
            if line.startswith("DISPLAYMANAGER="):
                new_lines.append('DISPLAYMANAGER="sddm"')
                found = True
            else:
                new_lines.append(line)

        if not found:
            new_lines.append('DISPLAYMANAGER="sddm"')

        dm_conf.write_text("\n".join(new_lines))
    else:
        dm_conf.write_text('DISPLAYMANAGER="sddm"\n')

    success("SDDM configured as display manager.")


def copy_system_configs(source_dir: Path) -> None:
    """Copy system configuration files."""
    info("=== Copying System Configuration ===")

    # conf.d/ -> /etc/conf.d/
    conf_d_src = source_dir / "conf.d"
    if conf_d_src.is_dir():
        conf_d_dst = Path("/etc/conf.d")
        for f in conf_d_src.iterdir():
            if f.is_file():
                shutil.copy2(f, conf_d_dst / f.name)
                success(f"Copied conf.d/{f.name}")

    # iptables/ -> /etc/iptables/ (for reference)
    # Also copy to /var/lib/iptables/ and /var/lib/ip6tables/ (OpenRC locations)
    iptables_src = source_dir / "iptables"
    if iptables_src.is_dir():
        # Copy to /etc/iptables for reference
        iptables_etc = Path("/etc/iptables")
        iptables_etc.mkdir(parents=True, exist_ok=True)
        for f in iptables_src.iterdir():
            if f.is_file():
                shutil.copy2(f, iptables_etc / f.name)
                success(f"Copied iptables/{f.name}")

        # Copy to OpenRC service locations
        iptables_var = Path("/var/lib/iptables")
        ip6tables_var = Path("/var/lib/ip6tables")
        iptables_var.mkdir(parents=True, exist_ok=True)
        ip6tables_var.mkdir(parents=True, exist_ok=True)

        rules_v4 = iptables_src / "iptables.rules"
        rules_v6 = iptables_src / "ip6tables.rules"

        if rules_v4.exists():
            shutil.copy2(rules_v4, iptables_var / "rules-save")
            success("Installed iptables rules to /var/lib/iptables/rules-save")

        if rules_v6.exists():
            shutil.copy2(rules_v6, ip6tables_var / "rules-save")
            success("Installed ip6tables rules to /var/lib/ip6tables/rules-save")

    # udev/ -> /etc/udev/rules.d/
    udev_src = source_dir / "udev"
    if udev_src.is_dir():
        udev_dst = Path("/etc/udev/rules.d")
        udev_dst.mkdir(parents=True, exist_ok=True)
        for f in udev_src.iterdir():
            if f.is_file():
                shutil.copy2(f, udev_dst / f.name)
                success(f"Copied udev/{f.name}")


def setup_openrc_services() -> None:
    """Add services to OpenRC runlevels."""
    info("=== Configuring OpenRC Services ===")

    # Boot runlevel
    info("Adding boot runlevel services...")
    for service in BOOT_SERVICES:
        result = run("rc-update", "add", service, "boot", check=False)
        if result.ok:
            success(f"  Added {service} to boot")
        else:
            error(f"  Warning: Could not add {service} (may already exist)")

    # Default runlevel
    info("Adding default runlevel services...")
    for service in DEFAULT_SERVICES:
        result = run("rc-update", "add", service, "default", check=False)
        if result.ok:
            success(f"  Added {service} to default")
        else:
            error(f"  Warning: Could not add {service} (may already exist)")

    print()
    info("Current runlevel configuration:")
    run("rc-update", "show")


def setup_services(source_dir: Path | None = None) -> None:
    """Full services setup workflow."""
    if source_dir is None:
        # Assume config files are in /root/gentoo or similar
        # This should be passed from setup.py
        source_dir = Path("/root/gentoo")

    emerge_services()
    print()
    configure_display_manager()
    print()
    copy_system_configs(source_dir)
    print()
    setup_openrc_services()

    print()
    success("=== Services Setup Complete ===")
    print()
    info("Next steps:")
    print("  1. Install kernel: emerge gentoo-kernel-bin (or gentoo-kernel)")
    print("  2. Configure bootloader")
    print("  3. Set root password: passwd")
    print("  4. Create user account")
    print("  5. Reboot and test")