"""DHCP/DNS (dnsmasq) management API blueprint.

Exposed at /api/dhcp/* and delegates all operations to vacuum-walld.
"""

import logging

from flask import Blueprint, request

from daemon.client import BadRequest, NotFound, delete, get, patch, post
from daemon.iface import (
    DELETE_DNSMASQ_DNS_RECORD_REMOVE,
    DELETE_DNSMASQ_RANGES_REMOVE,
    DELETE_DNSMASQ_STATIC_LEASE_REMOVE,
    GET_DNSMASQ_CONFIG,
    GET_DNSMASQ_LEASES,
    GET_DNSMASQ_STATUS,
    PATCH_DNSMASQ_CONFIG,
    POST_DNSMASQ_APPLY,
    POST_DNSMASQ_CONFIG,
    POST_DNSMASQ_DNS_RECORD_ADD,
    POST_DNSMASQ_DOMAIN,
    POST_DNSMASQ_RANGES_ADD,
    POST_DNSMASQ_STATIC_LEASE_ADD,
)
from webui.api.common import _error, _ok

logger = logging.getLogger(__name__)
bp = Blueprint("dhcp", __name__)


# ---------------------------------------------------------------------------
# Config
# ---------------------------------------------------------------------------


@bp.route("/config", methods=["GET"])
def get_config_bp():
    """GET /api/dhcp/config — Retrieve the current dnsmasq configuration.

    Returns:
        JSON response with the config or an error.
    """
    try:
        return _ok(get(GET_DNSMASQ_CONFIG))
    except RuntimeError as exc:
        logger.error("Failed to read DHCP config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/config", methods=["POST"])
def post_config():
    """POST /api/dhcp/config — Save a full replacement dnsmasq configuration.

    Args:
        request: JSON body containing the complete config object.

    Returns:
        JSON response with success status or an error.
    """
    body = request.get_json(silent=True) or {}
    if not isinstance(body, dict):
        return _error("Request body must be a JSON object", 400)
    try:
        post(POST_DNSMASQ_CONFIG, body)
        return _ok(None)
    except BadRequest as exc:
        logger.info("DHCP config save rejected: %s", exc)
        return _error(str(exc), 400)
    except RuntimeError as exc:
        logger.error("Failed to save DHCP config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/config", methods=["PATCH"])
def patch_config():
    """PATCH /api/dhcp/config — Partially update the dnsmasq configuration.

    Args:
        request: JSON body containing the fields to update.

    Returns:
        JSON response with success status or an error.
    """
    body = request.get_json(silent=True) or {}
    if not isinstance(body, dict):
        return _error("Request body must be a JSON object", 400)
    try:
        patch(PATCH_DNSMASQ_CONFIG, body)
        return _ok(None)
    except BadRequest as exc:
        logger.info("DHCP config patch rejected: %s", exc)
        return _error(str(exc), 400)
    except RuntimeError as exc:
        logger.error("Failed to patch DHCP config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/apply", methods=["POST"])
def apply_bp():
    """POST /api/dhcp/apply — Apply the current dnsmasq configuration to the running service."""

    try:
        post(POST_DNSMASQ_APPLY)
        logger.info("dnsmasq config applied via API")
        return _ok(None)
    except RuntimeError as exc:
        logger.error("Failed to apply dnsmasq config: %s", exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Status
# ---------------------------------------------------------------------------


@bp.route("/status", methods=["GET"])
def status_bp():
    """GET /api/dhcp/status — Retrieve dnsmasq service status."""

    try:
        return _ok(get(GET_DNSMASQ_STATUS))
    except RuntimeError as exc:
        logger.error("Failed to get DHCP status: %s", exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# DHCP ranges
# ---------------------------------------------------------------------------


@bp.route("/ranges", methods=["POST"])
def add_range_bp():
    """POST /api/dhcp/ranges — Add a DHCP address range for an interface.

    Args:
        request: JSON body with `interface`, `start`, `end`, and optional `lease_time`.

    Returns:
        JSON response with success status or an error.
    """
    body = request.get_json(silent=True) or {}
    iface = body.get("interface", "").strip() or None
    start = body.get("start", "").strip()
    end = body.get("end", "").strip()
    lease_time = body.get("lease_time", "12h")
    if not start or not end:
        return _error("'start' and 'end' are required", 400)
    try:
        post(
            POST_DNSMASQ_RANGES_ADD,
            {
                "interface": iface or "",
                "start": start,
                "end": end,
                "lease_time": lease_time,
            },
        )
        logger.info("DHCP range added via API: %s-%s", start, end)
        return _ok(None)
    except BadRequest as exc:
        logger.info("Add DHCP range rejected: %s", exc)
        return _error(str(exc), 400)
    except RuntimeError as exc:
        logger.error("Failed to add DHCP range: %s", exc)
        return _error(str(exc), 500)


@bp.route("/ranges", methods=["DELETE"])
def remove_range_bp():
    """DELETE /api/dhcp/ranges — Remove a DHCP address range.

    Args:
        request: JSON body with `interface`, `start`, and `end`.

    Returns:
        JSON response with success status or an error.
    """
    body = request.get_json(silent=True) or {}
    iface = body.get("interface", "").strip() or ""
    start = body.get("start", "").strip()
    end = body.get("end", "").strip()
    if not start or not end:
        return _error("'start' and 'end' are required", 400)
    try:
        delete(
            DELETE_DNSMASQ_RANGES_REMOVE,
            {"interface": iface, "start": start, "end": end},
        )
        logger.info("DHCP range removed via API: %s-%s", start, end)
        return _ok(None)
    except NotFound as exc:
        logger.info("Remove DHCP range not found: %s", exc)
        return _error(str(exc), 404)
    except RuntimeError as exc:
        logger.error("Failed to remove DHCP range: %s", exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Leases
# ---------------------------------------------------------------------------


@bp.route("/leases", methods=["GET"])
def leases_bp():
    """GET /api/dhcp/leases — Retrieve the current DHCP lease table."""

    try:
        return _ok(get(GET_DNSMASQ_LEASES))
    except RuntimeError as exc:
        logger.error("Failed to read lease table: %s", exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Static leases
# ---------------------------------------------------------------------------


@bp.route("/static-lease", methods=["POST"])
def add_static_lease_bp():
    """POST /api/dhcp/static-lease — Add a static DHCP lease by MAC address.

    Args:
        request: JSON body with `mac`, `ip`, and optional `hostname`.

    Returns:
        JSON response with lease details or an error.
    """
    body = request.get_json(silent=True) or {}
    mac = body.get("mac", "").strip()
    ip = body.get("ip", "").strip()
    hostname = body.get("hostname")
    if not mac or not ip:
        return _error("'mac' and 'ip' are required", 400)
    try:
        post(
            POST_DNSMASQ_STATIC_LEASE_ADD, {"mac": mac, "ip": ip, "hostname": hostname}
        )
        logger.info("Static lease added via API: %s -> %s", mac, ip)
        return _ok({"mac": mac, "ip": ip, "hostname": hostname})
    except BadRequest as exc:
        logger.info("Add static lease rejected: %s", exc)
        return _error(str(exc), 400)
    except RuntimeError as exc:
        logger.error("Failed to add static lease: %s", exc)
        return _error(str(exc), 500)


@bp.route("/static-lease/<mac>", methods=["DELETE"])
def remove_static_lease_bp(mac):
    """DELETE /api/dhcp/static-lease/<mac> — Remove a static DHCP lease by MAC address.

    Args:
        mac: MAC address of the static lease to remove.

    Returns:
        JSON response with success status or an error.
    """
    try:
        delete(DELETE_DNSMASQ_STATIC_LEASE_REMOVE, {"mac": mac})
        logger.info("Static lease removed via API: %s", mac)
        return _ok(None)
    except NotFound as exc:
        logger.info("Static lease '%s' not found: %s", mac, exc)
        return _error(str(exc), 404)
    except RuntimeError as exc:
        logger.error("Failed to remove static lease '%s': %s", mac, exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# DNS records
# ---------------------------------------------------------------------------


@bp.route("/dns-record", methods=["POST"])
def add_dns_record_bp():
    """POST /api/dhcp/dns-record — Add a DNS record.

    Args:
        request: JSON body with `name`, `address`, and optional `hostname`.

    Returns:
        JSON response with record details or an error.
    """
    body = request.get_json(silent=True) or {}
    name = body.get("name", "").strip()
    address = body.get("address", "").strip()
    hostname = body.get("hostname")
    if not name or not address:
        return _error("'name' and 'address' are required", 400)
    try:
        post(
            POST_DNSMASQ_DNS_RECORD_ADD,
            {"name": name, "address": address, "hostname": hostname},
        )
        logger.info("DNS record added via API: %s -> %s", name, address)
        return _ok({"name": name, "address": address, "hostname": hostname})
    except BadRequest as exc:
        logger.info("Add DNS record rejected: %s", exc)
        return _error(str(exc), 400)
    except RuntimeError as exc:
        logger.error("Failed to add DNS record: %s", exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# DNS domain
# ---------------------------------------------------------------------------


@bp.route("/domain", methods=["POST"])
def set_domain_bp():
    """POST /api/dhcp/domain — Set or clear the DNS search domain.

    Args:
        request: JSON body with `domain` field (string or null to clear).

    Returns:
        JSON response with success status or an error.
    """
    body = request.get_json(silent=True) or {}
    if not isinstance(body, dict):
        return _error("Request body must be a JSON object", 400)
    try:
        post(POST_DNSMASQ_DOMAIN, {"domain": body.get("domain")})
        logger.info("DNS domain updated via API: %s", body.get("domain"))
        return _ok(None)
    except BadRequest as exc:
        logger.info("Set DNS domain rejected: %s", exc)
        return _error(str(exc), 400)
    except RuntimeError as exc:
        logger.error("Failed to set DNS domain: %s", exc)
        return _error(str(exc), 500)


@bp.route("/dns-record/<name>", methods=["DELETE"])
def remove_dns_record_bp(name):
    """DELETE /api/dhcp/dns-record/<name> — Remove a DNS record by name.

    Args:
        name: Name of the DNS record to remove.

    Returns:
        JSON response with success status or an error.
    """
    try:
        delete(DELETE_DNSMASQ_DNS_RECORD_REMOVE, {"name": name})
        logger.info("DNS record removed via API: %s", name)
        return _ok(None)
    except NotFound as exc:
        logger.info("DNS record '%s' not found: %s", name, exc)
        return _error(str(exc), 404)
    except RuntimeError as exc:
        logger.error("Failed to remove DNS record '%s': %s", name, exc)
        return _error(str(exc), 500)