"""WireGuard tunnel management API blueprint.

Exposed at /api/wireguard/* and delegates to vacuum-walld.
"""

import logging

from flask import Blueprint, request

from daemon.client import BadRequest, NotFound, delete, get, patch, post
from webui.api.common import _error, _ok

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


@bp.route("/config", methods=["GET"])
def get_config_bp():
    try:
        return _ok(get("/wireguard/config"))
    except RuntimeError as exc:
        logger.error("Failed to read WireGuard config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/config", methods=["POST"])
def post_config():
    body = request.get_json(silent=True) or {}
    if not isinstance(body, dict):
        return _error("Request body must be a JSON object", 400)
    try:
        if "interface" in body:
            body = dict(body)
            body["interface"] = dict(body["interface"])
            body["interface"].pop("private_key", None)
        post("/wireguard/config", body)
        return _ok(None)
    except BadRequest as exc:
        logger.info("WireGuard config save rejected: %s", exc)
        return _error(str(exc), 400)
    except RuntimeError as exc:
        logger.error("Failed to save WireGuard config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/config", methods=["PATCH"])
def patch_config():
    body = request.get_json(silent=True) or {}
    if not isinstance(body, dict):
        return _error("Request body must be a JSON object", 400)
    try:
        if "interface" in body:
            body = dict(body)
            body["interface"] = dict(body["interface"])
            body["interface"].pop("private_key", None)
        patch("/wireguard/config", body)
        logger.info("WireGuard config patched: %s", sorted(body.keys()))
        return _ok(None)
    except BadRequest as exc:
        logger.info("WireGuard config patch rejected: %s", exc)
        return _error(str(exc), 400)
    except RuntimeError as exc:
        logger.error("Failed to patch WireGuard config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/apply", methods=["POST"])
def apply_bp():
    try:
        post("/wireguard/apply")
        logger.info("WireGuard tunnel applied via API")
        return _ok(None)
    except RuntimeError as exc:
        logger.error("Failed to apply WireGuard config: %s", exc)
        return _error(str(exc), 500)


@bp.route("/up", methods=["POST"])
def up_bp():
    try:
        post("/wireguard/apply")
        logger.info("WireGuard tunnel started via API")
        return _ok(None)
    except RuntimeError as exc:
        logger.error("Failed to start WireGuard tunnel: %s", exc)
        return _error(str(exc), 500)


@bp.route("/down", methods=["POST"])
def down_bp():
    try:
        post("/wireguard/down")
        logger.info("WireGuard tunnel brought down via API")
        return _ok(None)
    except RuntimeError as exc:
        logger.error("Failed to bring down WireGuard tunnel: %s", exc)
        return _error(str(exc), 500)


@bp.route("/status", methods=["GET"])
def status_bp():
    try:
        return _ok(get("/wireguard/status"))
    except RuntimeError as exc:
        logger.error("Failed to get WireGuard status: %s", exc)
        return _error(str(exc), 500)


@bp.route("/initialize", methods=["POST"])
def initialize_bp():
    try:
        post("/wireguard/initialize")
        logger.info("WireGuard initialized via API")
        return _ok(None)
    except RuntimeError as exc:
        logger.error("Failed to initialize WireGuard: %s", exc)
        return _error(str(exc), 500)


@bp.route("/peers", methods=["POST"])
def add_peer_bp():
    body = request.get_json(silent=True) or {}
    name = body.get("name", "").strip()
    if not name:
        return _error("'name' is required", 400)
    try:
        peer = post(
            "/wireguard/peers/add",
            {
                "name": name,
                "endpoint": body.get("endpoint"),
                "allowed_ips": body.get("allowed_ips", []),
                "persistent_keepalive": body.get("persistent_keepalive"),
                "preshared_key": body.get("preshared_key"),
            },
        )
        logger.info("WireGuard peer '%s' added via API", name)
        return _ok(peer)
    except BadRequest as exc:
        logger.info("Add peer '%s' rejected: %s", name, exc)
        return _error(str(exc), 400)
    except RuntimeError as exc:
        logger.error("Failed to add peer '%s': %s", name, exc)
        return _error(str(exc), 500)


@bp.route("/peers/<name>", methods=["DELETE"])
def remove_peer_bp(name):
    try:
        delete("/wireguard/peers/remove", {"name": name})
        logger.info("WireGuard peer '%s' removed via API", name)
        return _ok({"name": name})
    except NotFound as exc:
        logger.info("WireGuard peer '%s' not found: %s", name, exc)
        return _error(str(exc), 404)
    except RuntimeError as exc:
        logger.error("Failed to remove peer '%s': %s", name, exc)
        return _error(str(exc), 500)


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


@bp.route("/peer-status", methods=["GET"])
def peer_status_bp():
    try:
        return _ok(get("/wireguard/peer-status"))
    except RuntimeError as exc:
        logger.error("Failed to get WireGuard peer status: %s", exc)
        return _error(str(exc), 500)


@bp.route("/generate-client", methods=["POST"])
def generate_client_bp():
    body = request.get_json(silent=True) or {}
    name = body.get("name", "").strip()
    if not name:
        return _error("Field 'name' is required", 400)
    server_endpoint = body.get("server_endpoint", "")
    if not server_endpoint:
        return _error("Field 'server_endpoint' is required", 400)
    try:
        result = post(
            "/wireguard/generate-client",
            {
                "name": name,
                "server_endpoint": server_endpoint,
            },
        )
        logger.info("Client config generated for peer '%s' via API", name)
        return _ok({"config": result.get("config", "")})
    except NotFound as exc:
        logger.info("Peer '%s' not found for client config: %s", name, exc)
        return _error(str(exc), 404)
    except RuntimeError as exc:
        logger.error("Failed to generate client config for '%s': %s", name, exc)
        return _error(str(exc), 500)