"""
webui/api/firewall.py - Firewall (firewalld) management API blueprint.

Exposed at /api/firewall/*  and delegates all mutations to lib.firewall.
"""

import logging

from flask import Blueprint, jsonify, request

from lib.firewall import (
    add_forward_port,
    add_rich_rule,
    config_get,
    config_pending,
    config_set,
    create_zone,
    delete_zone,
    get_active_zones,
    get_available_zones,
    get_interfaces,
    get_rich_rules,
    get_services,
    get_zone_info,
    remove_forward_port_by_id,
    remove_rich_rule_by_id,
    set_masquerade,
    set_zone_interfaces,
    set_zone_services,
)

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


# ---------------------------------------------------------------------------
# Error helpers
# ---------------------------------------------------------------------------


def _error(msg, code=400):
    return jsonify({"ok": False, "error": msg}), code


def _ok(data=None):
    return jsonify({"ok": True, "data": data})


# ---------------------------------------------------------------------------
# Declarative config (two-step: save -> apply)
# ---------------------------------------------------------------------------


@bp.route("/config", methods=["GET"])
def config_get_bp():
    try:
        return _ok(config_get())
    except Exception as exc:
        logger.error("Failed to read firewall config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/config", methods=["POST"])
def config_set_bp():
    body = request.get_json(silent=True) or {}
    if "zones" not in body:
        return _error("'zones' key is required", 400)
    if not isinstance(body["zones"], dict):
        return _error("'zones' must be a dict", 400)
    try:
        config_set(body)
        pending_info = config_pending()
        logger.info("Firewall config saved (%d zones)", len(body["zones"]))
        return _ok(
            {
                "config_saved": True,
                "pending": pending_info["pending"],
                "needs_apply": pending_info["needs_apply"],
                "unmanaged_zones": pending_info.get("unmanaged_zones", {}),
            }
        )
    except Exception as exc:
        logger.error("Failed to save firewall config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/config/apply", methods=["POST"])
def config_apply_bp():
    try:
        from lib.firewall import config_apply as _config_apply

        result = _config_apply()
        logger.info("Firewall config applied: %s", result.get("applied_zones", []))
        return _ok(result)
    except Exception as exc:
        logger.error("Failed to apply firewall config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/config/pending", methods=["GET"])
def config_pending_bp():
    try:
        return _ok(config_pending())
    except Exception as exc:
        logger.error("Failed to check pending config: %s", exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Zones
# ---------------------------------------------------------------------------


@bp.route("/zones", methods=["GET"])
def list_zones():
    try:
        active = get_active_zones()
        available = get_available_zones()
        return _ok({"active": active, "available": available})
    except RuntimeError as exc:
        logger.error("Failed to list zones: %s", exc)
        return _error(str(exc), 500)


@bp.route("/zones/<name>", methods=["GET"])
def zone_details(name):
    try:
        if name not in get_available_zones():
            return _error(f"Zone '{name}' does not exist", 404)
        info = get_zone_info(name)
        return _ok(info)
    except RuntimeError as exc:
        logger.error("Failed to get zone '%s' info: %s", name, exc)
        return _error(str(exc), 500)


@bp.route("/zones", methods=["POST"])
def create_zone_bp():
    body = request.get_json(silent=True) or {}
    zone_name = body.get("name", "").strip()
    target = body.get("target", "default").strip() or "default"
    if not zone_name:
        return _error("Zone name is required", 400)
    try:
        if zone_name in get_available_zones():
            return _error(f"Zone '{zone_name}' already exists", 400)
        create_zone(zone_name, target)
        logger.info("Zone '%s' created via API", zone_name)
        return _ok(None)
    except RuntimeError as exc:
        logger.error("Failed to create zone '%s': %s", zone_name, exc)
        return _error(str(exc), 500)


@bp.route("/zones/<name>", methods=["DELETE"])
def delete_zone_bp(name):
    try:
        available = get_available_zones()
        if name not in available:
            return _error(f"Zone '{name}' does not exist", 404)
        delete_zone(name)
        logger.info("Zone '%s' deleted via API", name)
        return _ok(None)
    except RuntimeError as exc:
        logger.error("Failed to delete zone '%s': %s", name, exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Zone interfaces
# ---------------------------------------------------------------------------


@bp.route("/zones/<name>/interfaces", methods=["POST"])
def set_zone_interfaces_bp(name):
    body = request.get_json(silent=True) or {}
    interfaces = body.get("interfaces", [])
    if not isinstance(interfaces, list):
        return _error("'interfaces' must be a list", 400)
    try:
        set_zone_interfaces(name, interfaces)
        logger.info("Zone '%s' interfaces updated: %s", name, interfaces)
        return _ok({"zone": name, "interfaces": interfaces})
    except RuntimeError as exc:
        logger.error("Failed to set interfaces for zone '%s': %s", name, exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Zone services
# ---------------------------------------------------------------------------


@bp.route("/zones/<name>/services", methods=["POST"])
def set_zone_services_bp(name):
    body = request.get_json(silent=True) or {}
    services = body.get("services", [])
    if not isinstance(services, list):
        return _error("'services' must be a list", 400)
    try:
        set_zone_services(name, services)
        return _ok({"zone": name, "services": services})
    except RuntimeError as exc:
        logger.error("Failed to set services for zone '%s': %s", name, exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Available services and interfaces
# ---------------------------------------------------------------------------


@bp.route("/services", methods=["GET"])
def list_services():
    try:
        return _ok(get_services())
    except RuntimeError as exc:
        logger.error("Failed to list services: %s", exc)
        return _error(str(exc), 500)


@bp.route("/interfaces", methods=["GET"])
def list_interfaces():
    try:
        return _ok(get_interfaces())
    except RuntimeError as exc:
        logger.error("Failed to list interfaces: %s", exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Rich rules
# ---------------------------------------------------------------------------


@bp.route("/rich-rules", methods=["POST"])
def add_rich_rule_bp():
    body = request.get_json(silent=True) or {}
    zone = body.get("zone", "").strip()
    rule = body.get("rule", "").strip()
    if not zone or not rule:
        return _error("Both 'zone' and 'rule' are required", 400)
    try:
        entry = add_rich_rule(zone, rule)
        logger.info("Rich rule added to zone '%s': %s", zone, rule[:80])
        return _ok({"zone": zone, "id": entry["id"], "rule": rule})
    except RuntimeError as exc:
        logger.error("Failed to add rich rule to zone '%s': %s", zone, exc)
        return _error(str(exc), 500)


@bp.route("/rich-rules/<zone>", methods=["GET"])
def list_rich_rules(zone):
    try:
        rules = get_rich_rules(zone)
        from lib.firewall import config_get as firewall_config_get

        cfg = firewall_config_get()
        cfg_entries = cfg.get("zones", {}).get(zone, {}).get("rich_rules", [])
        result = []
        for rule_str in rules:
            matched = next(
                (e for e in cfg_entries if e.get("rule") == rule_str), None
            )
            if matched:
                result.append({"id": matched["id"], "rule": rule_str})
            else:
                result.append({"rule": rule_str})
        return _ok(result)
    except RuntimeError as exc:
        logger.error("Failed to get rich rules for zone '%s': %s", zone, exc)
        return _error(str(exc), 500)


@bp.route("/rich-rules/<zone>/<rule_id>", methods=["DELETE"])
def remove_rich_rule_bp(zone, rule_id):
    try:
        remove_rich_rule_by_id(zone, rule_id)
        logger.info("Rich rule '%s' removed from zone '%s'", rule_id, zone)
        return _ok({"zone": zone, "id": rule_id})
    except ValueError as exc:
        return _error(str(exc), 404)
    except RuntimeError as exc:
        logger.error("Failed to remove rich rule from zone '%s': %s", zone, exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Masquerade (NAT)
# ---------------------------------------------------------------------------


@bp.route("/masquerade", methods=["POST"])
def set_masquerade_bp():
    body = request.get_json(silent=True) or {}
    zone = body.get("zone", "").strip()
    enable = body.get("enable")
    if not zone or enable is None:
        return _error("'zone' and 'enable' (bool) are required", 400)
    try:
        set_masquerade(zone, bool(enable))
        logger.info(
            "Masquerade %s on zone '%s' via API",
            "enabled" if enable else "disabled",
            zone,
        )
        return _ok({"zone": zone, "masquerade": bool(enable)})
    except RuntimeError as exc:
        logger.error("Failed to set masquerade on zone '%s': %s", zone, exc)
        return _error(str(exc), 500)


# ---------------------------------------------------------------------------
# Port forwarding
# ---------------------------------------------------------------------------


@bp.route("/forward-port", methods=["POST"])
def add_forward_port_bp():
    body = request.get_json(silent=True) or {}
    zone = body.get("zone", "").strip()
    port = body.get("port")
    proto = body.get("proto", "").strip()
    toaddr = body.get("toaddr")
    toport = body.get("toport")
    if not zone or port is None or not proto:
        return _error("'zone', 'port', and 'proto' are required", 400)
    try:
        entry = add_forward_port(
            zone,
            int(port),
            proto,
            toaddr=str(toaddr) if toaddr else None,
            toport=int(toport) if toport else None,
        )
        return _ok(
            {"zone": zone, "id": entry["id"], "port": int(port), "proto": proto}
        )
    except (ValueError, RuntimeError) as exc:
        code = 400 if isinstance(exc, ValueError) else 500
        logger.error("Failed to add forward port: %s", exc)
        return _error(str(exc), code)


@bp.route("/forward-port/<zone>/<int:port>/<proto>", methods=["DELETE"])
def remove_forward_port_bp(zone, port, proto):
    try:
        remove_forward_port_by_id(zone, port, proto)
        logger.info("Forward port %s/%s removed from zone '%s'", port, proto, zone)
        return _ok({"zone": zone, "port": port, "proto": proto})
    except ValueError as exc:
        return _error(str(exc), 404)
    except RuntimeError as exc:
        logger.error("Failed to remove forward port from zone '%s': %s", zone, exc)
        return _error(str(exc), 500)