# PATH: bot/core/speedtest.py
import asyncio
import os
import time
from typing import Optional

import httpx

CF_DOWN = "https://speed.cloudflare.com/__down"
CF_UP = "https://speed.cloudflare.com/__up"


def bytes_to_mb(n: float) -> float:
    return float(n) / (1024.0 * 1024.0)


def bytes_per_sec_to_mb_s(bps: float) -> float:
    return float(bps) / (1024.0 * 1024.0)


def disk_total_free(path: str = "/") -> dict:
    st = os.statvfs(path)
    total = st.f_frsize * st.f_blocks
    free = st.f_frsize * st.f_frsize * (st.f_bavail // st.f_frsize) if st.f_frsize else st.f_frsize * st.f_bavail
    free = st.f_frsize * st.f_bavail
    return {"total": int(total), "free": int(free)}


async def ping_ms(host: str = "1.1.1.1", port: int = 443, timeout: float = 3.0) -> Optional[float]:
    """
    "Ping" approximation via TCP connect time (no ICMP).
    Returns ms or None.
    """
    t0 = time.perf_counter()
    try:
        fut = asyncio.open_connection(host, port)
        reader, writer = await asyncio.wait_for(fut, timeout=timeout)
        try:
            writer.close()
            if hasattr(writer, "wait_closed"):
                await writer.wait_closed()
        except Exception:
            pass
        return (time.perf_counter() - t0) * 1000.0
    except Exception:
        return None


async def public_ip(timeout: float = 6.0) -> Optional[str]:
    """
    Best-effort public IP.
    Tries ipify, then Cloudflare trace.
    """
    try:
        async with httpx.AsyncClient(timeout=timeout, follow_redirects=True) as c:
            r = await c.get("https://api.ipify.org?format=json")
            if r.status_code < 400:
                j = r.json()
                ip = str(j.get("ip") or "").strip()
                if ip:
                    return ip
    except Exception:
        pass

    try:
        async with httpx.AsyncClient(timeout=timeout, follow_redirects=True) as c:
            r = await c.get("https://cloudflare.com/cdn-cgi/trace")
            if r.status_code < 400:
                txt = r.text or ""
                for ln in txt.splitlines():
                    if ln.startswith("ip="):
                        ip = ln.split("=", 1)[1].strip()
                        if ip:
                            return ip
    except Exception:
        pass

    return None


async def net_download_test(bytes_target: int = 8 * 1024 * 1024, timeout: float = 15.0) -> dict:
    """
    Downloads bytes_target from Cloudflare endpoint and measures throughput.
    """
    url = f"{CF_DOWN}?bytes={int(bytes_target)}"
    t0 = time.perf_counter()
    got = 0

    limits = httpx.Limits(max_connections=10, max_keepalive_connections=5)
    async with httpx.AsyncClient(timeout=timeout, limits=limits, follow_redirects=True) as client:
        async with client.stream("GET", url) as r:
            r.raise_for_status()
            async for chunk in r.aiter_bytes():
                got += len(chunk)

    sec = max(1e-6, time.perf_counter() - t0)
    bps = got / sec
    return {"bytes": int(got), "seconds": float(sec), "bps": float(bps)}


async def net_upload_test(bytes_target: int = 3 * 1024 * 1024, timeout: float = 20.0) -> dict:
    """
    Uploads bytes_target to Cloudflare endpoint and measures throughput.
    """
    payload = os.urandom(int(bytes_target))
    t0 = time.perf_counter()

    limits = httpx.Limits(max_connections=10, max_keepalive_connections=5)
    async with httpx.AsyncClient(timeout=timeout, limits=limits, follow_redirects=True) as client:
        r = await client.post(CF_UP, content=payload, headers={"content-type": "application/octet-stream"})
        r.raise_for_status()

    sec = max(1e-6, time.perf_counter() - t0)
    bps = bytes_target / sec
    return {"bytes": int(bytes_target), "seconds": float(sec), "bps": float(bps)}