"""Firewall daemon handler.

Reads from the pre-computed state for status endpoints. Executes
firewall-cmd with sudo for mutations. Refers state after each mutation.
"""

import logging
from contextlib import suppress
from pathlib import Path
from typing import Any
from uuid import uuid4

from daemon.server import NotFoundError, refresh_state, registry
from lib.common import load_json, run, save_json
from lib.firewall import (
    _normalize_target,
    _parse_active_zones,
    _parse_zone_output,
)
from lib.firewall import (
    save_backup as _save_backup,
)

logger = logging.getLogger(__name__)

PROJECT_DIR = Path(__file__).resolve().parent.parent.parent
CONFIG_DIR = PROJECT_DIR / "config" / "firewall"
CONFIG_FILE = CONFIG_DIR / "config.json"
DEFAULT_CONFIG = {"zones": {}}


def _get_state() -> dict[str, Any] | None:
    """Return the current firewall state from the state store."""
    from lib.state import state as state_store

    return state_store.get("firewall")


def _ensure_config_file() -> None:
    """Initialize config file with defaults if missing."""
    if not CONFIG_FILE.exists():
        CONFIG_FILE.parent.mkdir(parents=True, exist_ok=True)
        save_json(CONFIG_FILE, DEFAULT_CONFIG, indent=2)


def _get_config() -> dict[str, Any]:
    """Load the firewall config file."""
    _ensure_config_file()
    return load_json(CONFIG_FILE)


def _save_config(cfg: dict[str, Any]) -> None:
    """Persist firewall config to disk."""
    _ensure_config_file()
    save_json(CONFIG_FILE, cfg, indent=2)


def _reload() -> None:
    """Reload firewalld to apply permanent changes."""
    run(["firewall-cmd", "--reload"], sudo=True)


def _fp_to_str(fp: dict[str, Any]) -> str:
    """Convert a forward-port dict to firewall-cmd CLI argument string."""
    parts = [f"port={fp['port']}", f"proto={fp['proto']}"]
    if "toaddr" in fp:
        parts.append(f"toaddr={fp['toaddr']}")
    if "toport" in fp:
        parts.append(f"toport={fp['toport']}")
    return "/".join(parts)


def _get_forward_ports(zone_name: str) -> list[str]:
    """Return forward-port entries for a zone as CLI-style strings."""
    with suppress(Exception):
        fps = _parse_zone_output(
            zone_name,
            run(["firewall-cmd", f"--zone={zone_name}", "--list-all"], sudo=True),
        ).get("forward-ports", [])
        return [_fp_to_str(fp) for fp in fps if isinstance(fp, dict)]
    return []


def _config_apply() -> dict[str, Any]:
    """Apply the declarative config to live firewalld."""
    from lib.firewall import get_config as _get_lib_config

    cfg = _get_lib_config()
    cfg_zones = cfg.get("zones", {})

    full_state: dict[str, Any] = {
        "active_zones": {},
        "interfaces": [],
        "available_services": [],
        "zones": {},
        "rich_rules": {},
        "timestamp": "",
    }
    _save_backup(full_state)

    available = run(["firewall-cmd", "--get-zones"], sudo=True).split()
    applied: list[str] = []
    for zone_name, zone_cfg in cfg_zones.items():
        need_create = zone_name not in available

        if need_create:
            target = _normalize_target(zone_cfg.get("target", "DEFAULT"))
            run(
                [
                    "firewall-cmd",
                    f"--zone={zone_name}",
                    f"--set-target={target}",
                    "--permanent",
                ],
                sudo=True,
            )
            _reload()
        else:
            desired_target = _normalize_target(zone_cfg.get("target", "DEFAULT"))
            if desired_target != "default":
                with suppress(RuntimeError):
                    run(
                        [
                            "firewall-cmd",
                            f"--zone={zone_name}",
                            f"--set-target={desired_target}",
                            "--permanent",
                        ],
                        sudo=True,
                        check=False,
                    )

        current_svcs: list[str] = []
        with suppress(Exception):
            current_svcs = _parse_zone_output(
                zone_name,
                run(["firewall-cmd", f"--zone={zone_name}", "--list-all"], sudo=True),
            ).get("services", [])
        for svc in current_svcs:
            run(
                [
                    "firewall-cmd",
                    f"--zone={zone_name}",
                    f"--remove-service={svc}",
                    "--permanent",
                ],
                sudo=True,
                check=False,
            )
        for svc in zone_cfg.get("services", []):
            run(
                [
                    "firewall-cmd",
                    f"--zone={zone_name}",
                    f"--add-service={svc}",
                    "--permanent",
                ],
                sudo=True,
            )

        current_ifaces: list[str] = []
        with suppress(Exception):
            current_ifaces = _parse_zone_output(
                zone_name,
                run(["firewall-cmd", f"--zone={zone_name}", "--list-all"], sudo=True),
            ).get("interfaces", [])
        for iface in current_ifaces:
            run(
                [
                    "firewall-cmd",
                    f"--zone={zone_name}",
                    "--remove-interface=" + iface,
                    "--permanent",
                ],
                sudo=True,
                check=False,
            )
        for iface in zone_cfg.get("interfaces", []):
            run(
                [
                    "firewall-cmd",
                    f"--zone={zone_name}",
                    "--add-interface=" + iface,
                    "--permanent",
                ],
                sudo=True,
            )

        mq = zone_cfg.get("masquerade", False)
        if mq is not None:
            action = "--add-masquerade" if mq else "--remove-masquerade"
            run(
                ["firewall-cmd", f"--zone={zone_name}", action, "--permanent"],
                sudo=True,
            )

        for rule_entry in zone_cfg.get("rich_rules", []):
            rule_str = (
                rule_entry.get("rule", "")
                if isinstance(rule_entry, dict)
                else str(rule_entry)
            )
            if rule_str:
                run(
                    [
                        "firewall-cmd",
                        f"--zone={zone_name}",
                        f"--add-rich-rule={rule_str}",
                        "--permanent",
                    ],
                    sudo=True,
                    check=False,
                )

        current_fps = _get_forward_ports(zone_name)
        for fp_str in current_fps:
            run(
                [
                    "firewall-cmd",
                    f"--zone={zone_name}",
                    f"--remove-forward-port={fp_str}",
                    "--permanent",
                ],
                sudo=True,
                check=False,
            )
        for fp_entry in zone_cfg.get("forward_ports", []):
            fp_str = fp_entry if isinstance(fp_entry, str) else _fp_to_str(fp_entry)
            run(
                [
                    "firewall-cmd",
                    f"--zone={zone_name}",
                    f"--add-forward-port={fp_str}",
                    "--permanent",
                ],
                sudo=True,
                check=False,
            )

        applied.append(zone_name)

    _reload()
    full_state = {
        "active_zones": {},
        "interfaces": [],
        "available_services": [],
        "zones": {},
        "rich_rules": {},
        "timestamp": "",
    }
    backup_path = _save_backup(full_state)
    logger.info("Firewall config applied to %d zones", len(applied))
    return {
        "applied_zones": applied,
        "backup": backup_path,
    }


# ---------------------------------------------------------------------------
# Routes — GET endpoints read from state, mutations call refresh_state
# ---------------------------------------------------------------------------


def _get_fw_state() -> dict[str, Any]:
    """Return firewall state from the state store, or empty dict if absent."""
    fw = _get_state()
    if fw is None:
        return {}
    return fw


@registry.register("GET", "/firewall/interfaces")
def get_interfaces(_request: Any, _body: Any) -> list[dict[str, Any]]:
    """GET /firewall/interfaces — return active interfaces from state."""
    fw = _get_fw_state()
    return fw.get("interfaces", [])


@registry.register("GET", "/firewall/zones")
def get_zones(_request: Any, _body: Any) -> dict[str, Any]:
    fw = _get_fw_state()
    active = fw.get("active_zones", {})
    zones = fw.get("zones", {})
    return {"active": active, "available": list(zones.keys())}


@registry.register("GET", "/firewall/zones/info")
def get_zone_info(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body or "zone" not in body:
        raise ValueError("'zone' is required")
    zone = body["zone"]
    fw = _get_fw_state()
    zones = fw.get("zones", {})
    if zone not in zones:
        raise NotFoundError(f"Zone '{zone}' does not exist")
    return zones[zone]


@registry.register("GET", "/firewall/zones/all")
def get_all_zones_info(_request: Any, _body: Any) -> list[dict[str, Any]]:
    fw = _get_fw_state()
    active = fw.get("active_zones", {})
    zones = fw.get("zones", {})
    result: list[dict[str, Any]] = []
    for zone_name in active:
        if zone_name in zones:
            result.append(zones[zone_name])
    return result


@registry.register("GET", "/firewall/services")
def get_services(_request: Any, _body: Any) -> list[str]:
    fw = _get_fw_state()
    return fw.get("available_services", [])


@registry.register("GET", "/firewall/config")
def get_config(_request: Any, _body: Any) -> dict[str, Any]:
    return _get_config()


@registry.register("POST", "/firewall/config")
def save_config_handler(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body or "zones" not in body:
        raise ValueError("'zones' key is required")
    if not isinstance(body["zones"], dict):
        raise ValueError("'zones' must be a dict")
    _save_config(body)
    logger.info("Firewall config saved (%d zones)", len(body["zones"]))
    refresh_state(["firewall"])
    return {"config_saved": True}


@registry.register("PATCH", "/firewall/config")
def patch_config(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body:
        raise ValueError("Request body must be a JSON object")
    from lib.common import deep_merge

    current = _get_config()
    merged = deep_merge(current, body)
    _save_config(merged)
    logger.info("Firewall config patched: %s", sorted(body.keys()))
    refresh_state(["firewall"])
    return {"config_saved": True}


@registry.register("GET", "/firewall/config/pending")
def config_pending_handler(_request: Any, _body: Any) -> dict[str, Any]:
    fw = _get_fw_state()
    return fw.get("pending", {})


@registry.register("POST", "/firewall/config/apply")
def config_apply(_request: Any, _body: Any) -> dict[str, Any]:
    result = _config_apply()
    logger.info("Firewall config applied: %s", result.get("applied_zones", []))
    refresh_state(["firewall"])
    return result


@registry.register("POST", "/firewall/zones/create")
def create_zone(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body:
        raise ValueError("Request body required")
    zone_name = body.get("name", "").strip()
    target = body.get("target", "default").strip() or "default"
    if not zone_name:
        raise ValueError("Zone name is required")
    available = run(["firewall-cmd", "--get-zones"], sudo=True).split()
    if zone_name in available:
        raise ValueError(f"Zone '{zone_name}' already exists")
    run(
        [
            "firewall-cmd",
            f"--zone={zone_name}",
            f"--set-target={target}",
            "--permanent",
        ],
        sudo=True,
    )
    _reload()
    logger.info("Zone '%s' created (target=%s)", zone_name, target)
    refresh_state(["firewall"])
    return {"zone": zone_name}


@registry.register("DELETE", "/firewall/zones/delete")
def delete_zone(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body or "zone" not in body:
        raise ValueError("'zone' is required")
    zone = body["zone"]
    available = run(["firewall-cmd", "--get-zones"], sudo=True).split()
    if zone not in available:
        raise NotFoundError(f"Zone '{zone}' does not exist")
    run(["firewall-cmd", f"--zone={zone}", "--delete", "--permanent"], sudo=True)
    _reload()
    logger.info("Zone '%s' deleted", zone)
    refresh_state(["firewall"])
    return {"zone": zone}


@registry.register("POST", "/firewall/zones/interfaces")
def set_zone_interfaces(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body:
        raise ValueError("Request body required")
    zone = body.get("zone", "").strip()
    interfaces = body.get("interfaces", [])
    if not zone:
        raise ValueError("'zone' is required")
    if zone not in run(["firewall-cmd", "--get-zones"], sudo=True).split():
        raise NotFoundError(f"Zone '{zone}' does not exist")

    # Determine old zone for each interface being reassigned
    active_raw = run(["firewall-cmd", "--get-active-zones"], sudo=True)
    active = _parse_active_zones(active_raw)

    for iface in interfaces:
        # Find which zone currently owns this interface
        old_zone = None
        for az, az_ifaces in active.items():
            if iface in az_ifaces:
                old_zone = az
                break
        # Remove from old zone (if different from target)
        if old_zone and old_zone != zone:
            run(
                [
                    "firewall-cmd",
                    f"--zone={old_zone}",
                    "--remove-interface=" + iface,
                    "--permanent",
                ],
                sudo=True,
                check=False,
            )
        # Add to target zone
        run(
            [
                "firewall-cmd",
                f"--zone={zone}",
                "--add-interface=" + iface,
                "--permanent",
            ],
            sudo=True,
        )

    _reload()

    # Update config
    cfg = _get_config()
    cfg.setdefault("zones", {})
    cfg["zones"].setdefault(zone, {})
    cfg["zones"][zone]["interfaces"] = list(interfaces)
    # Remove interface from any old zone in config
    for old_zone_name, old_zone_cfg in cfg["zones"].items():
        if old_zone_name == zone:
            continue
        old_ifaces = old_zone_cfg.get("interfaces", [])
        new_ifaces = [i for i in old_ifaces if i not in interfaces]
        if len(new_ifaces) < len(old_ifaces):
            if new_ifaces:
                old_zone_cfg["interfaces"] = new_ifaces
            elif "interfaces" in old_zone_cfg:
                del old_zone_cfg["interfaces"]
    _save_config(cfg)

    logger.info("Zone '%s' interfaces set to %s", zone, interfaces)
    refresh_state(["firewall"])
    return {"zone": zone, "interfaces": interfaces}


@registry.register("POST", "/firewall/zones/services")
def set_zone_services(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body:
        raise ValueError("Request body required")
    zone = body.get("zone", "").strip()
    services = body.get("services", [])
    if not zone:
        raise ValueError("'zone' is required")
    if zone not in run(["firewall-cmd", "--get-zones"], sudo=True).split():
        raise NotFoundError(f"Zone '{zone}' does not exist")
    current = _parse_zone_output(
        zone, run(["firewall-cmd", f"--zone={zone}", "--list-all"], sudo=True)
    ).get("services", [])
    for svc in current:
        run(
            [
                "firewall-cmd",
                f"--zone={zone}",
                f"--remove-service={svc}",
                "--permanent",
            ],
            sudo=True,
            check=False,
        )
    for svc in services:
        run(
            [
                "firewall-cmd",
                f"--zone={zone}",
                f"--add-service={svc}",
                "--permanent",
            ],
            sudo=True,
        )
    _reload()
    refresh_state(["firewall"])
    return {"zone": zone, "services": services}


@registry.register("POST", "/firewall/rich-rules/add")
def add_rich_rule(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body:
        raise ValueError("Request body required")
    zone = body.get("zone", "").strip()
    rule = body.get("rule", "").strip()
    if not zone or not rule:
        raise ValueError("'zone' and 'rule' are required")
    if zone not in run(["firewall-cmd", "--get-zones"], sudo=True).split():
        raise NotFoundError(f"Zone '{zone}' does not exist")

    run(
        [
            "firewall-cmd",
            f"--zone={zone}",
            "--add-rich-rule=" + rule,
            "--permanent",
        ],
        sudo=True,
    )
    _reload()
    cfg = _get_config()
    cfg.setdefault("zones", {}).setdefault(zone, {}).setdefault("rich_rules", [])
    rule_id = uuid4().hex[:8]
    entry = {"id": rule_id, "rule": rule}
    cfg["zones"][zone]["rich_rules"].append(entry)
    _save_config(cfg)
    refresh_state(["firewall"])
    return {"zone": zone, "id": rule_id, "rule": rule}


@registry.register("DELETE", "/firewall/rich-rules/remove")
def remove_rich_rule(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body:
        raise ValueError("Request body required")
    zone = body.get("zone", "").strip()
    rule_id = body.get("id", "").strip()
    if not zone or not rule_id:
        raise ValueError("'zone' and 'id' are required")
    if zone not in run(["firewall-cmd", "--get-zones"], sudo=True).split():
        raise NotFoundError(f"Zone '{zone}' does not exist")
    cfg = _get_config()
    zone_cfg = cfg.get("zones", {}).get(zone, {})
    entry = None
    for r in zone_cfg.get("rich_rules", []):
        if r.get("id") == rule_id:
            entry = r
            break
    if entry is None:
        raise NotFoundError(f"Rich rule '{rule_id}' not found in zone '{zone}'")
    rule = entry["rule"]
    run(
        [
            "firewall-cmd",
            f"--zone={zone}",
            "--remove-rich-rule=" + rule,
            "--permanent",
        ],
        sudo=True,
    )
    _reload()
    zone_cfg["rich_rules"] = [
        r for r in zone_cfg.get("rich_rules", []) if r.get("id") != rule_id
    ]
    _save_config(cfg)
    refresh_state(["firewall"])
    return {"zone": zone, "id": rule_id}


@registry.register("GET", "/firewall/rich-rules")
def list_rich_rules(_request: Any, body: dict[str, Any] | None) -> list[dict[str, Any]]:
    if not body or "zone" not in body:
        raise ValueError("'zone' is required")
    zone = body["zone"]
    fw = _get_fw_state()
    rich_rules = fw.get("rich_rules", {})
    cfg = _get_config()
    cfg_entries = cfg.get("zones", {}).get(zone, {}).get("rich_rules", [])
    result: list[dict[str, Any]] = []
    zone_rules = rich_rules.get(zone, [])
    for rule_str in zone_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 result


@registry.register("POST", "/firewall/masquerade")
def set_masquerade(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body:
        raise ValueError("Request body required")
    zone = body.get("zone", "").strip()
    enable = body.get("enable")
    if not zone or enable is None:
        raise ValueError("'zone' and 'enable' (bool) are required")
    action = "--add-masquerade" if enable else "--remove-masquerade"
    run(["firewall-cmd", f"--zone={zone}", action, "--permanent"], sudo=True)
    _reload()
    refresh_state(["firewall"])
    return {"zone": zone, "masquerade": bool(enable)}


@registry.register("POST", "/firewall/forward-port/add")
def add_forward_port(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body:
        raise ValueError("Request body required")
    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:
        raise ValueError("'zone', 'port', and 'proto' are required")

    fwd = f"port={port}/proto={proto}"
    if toaddr and toport:
        fwd += f"/toaddr={toaddr}/toport={toport}"
    elif toport:
        fwd += f"/toport={toport}"
    elif toaddr:
        fwd += f"/toaddr={toaddr}"
    run(
        [
            "firewall-cmd",
            f"--zone={zone}",
            f"--add-forward-port={fwd}",
            "--permanent",
        ],
        sudo=True,
    )
    _reload()
    fp_id = uuid4().hex[:8]
    entry: dict[str, Any] = {"id": fp_id, "port": int(port), "proto": proto}
    if toaddr:
        entry["toaddr"] = toaddr
    if toport:
        entry["toport"] = int(toport)
    cfg = _get_config()
    cfg.setdefault("zones", {}).setdefault(zone, {}).setdefault("forward_ports", [])
    cfg["zones"][zone]["forward_ports"].append(entry)
    _save_config(cfg)
    refresh_state(["firewall"])
    return {"zone": zone, "id": fp_id, "port": int(port), "proto": proto}


@registry.register("DELETE", "/firewall/forward-port/remove")
def remove_forward_port(_request: Any, body: dict[str, Any] | None) -> dict[str, Any]:
    if not body:
        raise ValueError("Request body required")
    zone = body.get("zone", "").strip()
    port = body.get("port")
    proto = body.get("proto", "").strip()
    if not zone or port is None or not proto:
        raise ValueError("'zone', 'port', and 'proto' are required")
    available = run(["firewall-cmd", "--get-zones"], sudo=True).split()
    if zone not in available:
        raise NotFoundError(f"Zone '{zone}' does not exist")
    fwd = f"port={port}/proto={proto}"
    cfg = _get_config()
    fps = cfg.get("zones", {}).get(zone, {}).get("forward_ports", [])
    found = False
    for fp in fps:
        if fp.get("port") == port and fp.get("proto") == proto:
            found = True
            if fp.get("toaddr") and fp.get("toport"):
                fwd += f"/toaddr={fp['toaddr']}/toport={fp['toport']}"
            elif fp.get("toport"):
                fwd += f"/toport={fp['toport']}"
            elif fp.get("toaddr"):
                fwd += f"/toaddr={fp['toaddr']}"
            break
    if not found:
        raise NotFoundError(f"Forward port {port}/{proto} not found in zone '{zone}'")
    run(
        [
            "firewall-cmd",
            f"--zone={zone}",
            f"--remove-forward-port={fwd}",
            "--permanent",
        ],
        sudo=True,
    )
    _reload()
    cfg.setdefault("zones", {}).setdefault(zone, {})
    cfg["zones"][zone]["forward_ports"] = [
        fp for fp in fps if not (fp.get("port") == port and fp.get("proto") == proto)
    ]
    _save_config(cfg)
    refresh_state(["firewall"])
    return {"zone": zone, "port": int(port), "proto": proto}


@registry.register("GET", "/firewall/state")
def get_state(_request: Any, _body: Any) -> dict[str, Any]:
    fw = _get_state()
    if fw is None:
        return {}
    return {
        "active_zones": fw.get("active_zones", {}),
        "interfaces": fw.get("interfaces", []),
        "available_services": fw.get("available_services", []),
        "zones": fw.get("zones", {}),
        "rich_rules": fw.get("rich_rules", {}),
        "timestamp": fw.get("timestamp", ""),
    }