"""CRUD + connection tests for linked 3x-ui panels."""

from __future__ import annotations

import json
from datetime import datetime, timezone
from typing import Any

from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.models import XuiPanel
from app.services.xui import (
    SUPPORTED_CLIENT_PROTOCOLS,
    XuiApiError,
    XuiClient,
    normalize_base_url,
)


def _client_for(panel: XuiPanel) -> XuiClient:
    return XuiClient(
        panel.base_url,
        username=panel.username,
        password=panel.password,
        api_token=panel.api_token,
        verify_ssl=panel.verify_ssl,
    )


async def list_panels(session: AsyncSession) -> list[XuiPanel]:
    result = await session.execute(select(XuiPanel).order_by(XuiPanel.id.desc()))
    return list(result.scalars().all())


async def create_panel(
    session: AsyncSession,
    *,
    name: str,
    base_url: str,
    username: str = "",
    password: str = "",
    api_token: str = "",
    verify_ssl: bool = True,
) -> XuiPanel:
    token = api_token.strip() or None
    user = username.strip() or None
    pwd = password.strip() or None
    if not token and not (user and pwd):
        raise ValueError("Укажите API Token или логин и пароль")

    url = normalize_base_url(base_url)
    panel = XuiPanel(
        name=(name.strip() or url),
        base_url=url,
        username=user,
        password=pwd,
        api_token=token,
        verify_ssl=verify_ssl,
        is_enabled=True,
    )
    session.add(panel)
    await session.commit()
    await session.refresh(panel)

    await check_panel(session, panel.id)
    await session.refresh(panel)
    if not panel.is_reachable:
        raise ValueError(panel.last_error or "Не удалось подключиться к 3x-ui")
    return panel


async def check_panel(session: AsyncSession, panel_id: int) -> XuiPanel:
    panel = await session.get(XuiPanel, panel_id)
    if not panel:
        raise ValueError("Панель не найдена")

    now = datetime.now(timezone.utc)
    try:
        async with _client_for(panel) as client:
            info = await client.test_connection()
        panel.is_reachable = True
        panel.last_error = None
        panel.panel_info = json.dumps(info, ensure_ascii=False, default=str)[:8000]
        panel.last_checked = now
    except (XuiApiError, ValueError, OSError) as exc:
        panel.is_reachable = False
        panel.last_error = str(exc)[:2000]
        panel.last_checked = now
        await session.commit()
        await session.refresh(panel)
        raise ValueError(str(exc)) from exc

    await session.commit()
    await session.refresh(panel)
    return panel


async def delete_panel(session: AsyncSession, panel_id: int) -> None:
    panel = await session.get(XuiPanel, panel_id)
    if panel:
        await session.delete(panel)
        await session.commit()


async def fetch_panel_data(panel: XuiPanel) -> dict[str, Any]:
    async with _client_for(panel) as client:
        status = await client.get_status()
        all_inbounds = await client.list_inbounds()
        available = await client.list_available_inbounds(
            protocols=SUPPORTED_CLIENT_PROTOCOLS, enabled_only=False
        )
        vless_inbounds = [i for i in available if str(i.get("protocol")).lower() == "vless"]
        wg_inbounds = [i for i in available if str(i.get("protocol")).lower() == "wireguard"]
        try:
            clients = await client.list_clients()
        except XuiApiError:
            clients = []
        return {
            "status": status,
            "inbounds": all_inbounds,
            "available_inbounds": available,
            "vless_inbounds": vless_inbounds,
            "wireguard_inbounds": wg_inbounds,
            "clients": clients,
        }


async def load_available_inbounds(
    panel: XuiPanel,
    *,
    protocol: str | None = None,
) -> list[dict]:
    protocols: tuple[str, ...]
    if protocol:
        protocols = (protocol.lower(),)
    else:
        protocols = SUPPORTED_CLIENT_PROTOCOLS
    async with _client_for(panel) as client:
        return await client.list_available_inbounds(protocols=protocols, enabled_only=True)


def compute_expiry_time(*, days: int, start_after_first_use: bool) -> int:
    """
    3x-ui expiryTime encoding:
      0  — unlimited
      >0 — absolute deadline in unix ms
      <0 — duration ms; countdown starts after first use
    """
    days = int(days or 0)
    if days <= 0:
        return 0
    duration_ms = days * 24 * 60 * 60 * 1000
    if start_after_first_use:
        return -duration_ms
    import time

    return int(time.time() * 1000) + duration_ms


async def add_xui_client(
    panel: XuiPanel,
    *,
    protocol: str,
    email: str,
    inbound_id: int,
    total_gb: int = 0,
    limit_ip: int = 0,
    expiry_days: int = 0,
    start_after_first_use: bool = False,
    flow: str = "",
    comment: str = "",
) -> dict:
    proto = protocol.strip().lower()
    bytes_limit = total_gb * 1024 * 1024 * 1024 if total_gb > 0 else 0
    expiry_time = compute_expiry_time(days=expiry_days, start_after_first_use=start_after_first_use)
    async with _client_for(panel) as client:
        if proto == "vless":
            result = await client.add_vless_client(
                email=email,
                inbound_id=inbound_id,
                total_gb=bytes_limit,
                expiry_time=expiry_time,
                limit_ip=limit_ip,
                flow=flow,
                comment=comment,
            )
        elif proto == "wireguard":
            result = await client.add_wireguard_client(
                email=email,
                inbound_id=inbound_id,
                total_gb=bytes_limit,
                expiry_time=expiry_time,
                limit_ip=limit_ip,
                comment=comment,
            )
        else:
            raise ValueError("Поддерживаются только vless и wireguard")
        result["expiry_days"] = expiry_days
        result["start_after_first_use"] = start_after_first_use
        return result