"""
Copyright © IQ.Lvbs, apart of Project Teal Lvbs, All Rights Reserved, licensed under https://konn3kt.com/tos/
"""
from __future__ import annotations

import hashlib
import json
import os

from iqpilot.common.swaglog import cloudlog
import urllib.request
from pathlib import Path

from iqpilot.system.hardware.usb import egpu_dock_ready

USB_SYSFS_ROOT = "/sys/bus/usb/devices"
FIRMWARE_MIRROR = os.getenv("IQ_EGPU_FIRMWARE_MIRROR", "/data/firmware/tinygrad")
TINYGRAD_CACHE = "/data/.cache"

COMMA_LFS_BATCH_URL = "https://gitlab.com/commaai/openpilot-lfs.git/info/lfs/objects/batch"

DOWNLOAD_CHUNK = 4 * 1024 * 1024


def usbgpu_present(sysfs_root: str = USB_SYSFS_ROOT) -> bool:
  return egpu_dock_ready(Path(sysfs_root))


def egpu_present_consented(params, sysfs_root: str = USB_SYSFS_ROOT) -> bool:
  try:
    if params is not None and params.get_bool("IQEgpuDisabled"):
      return False
  except Exception:
    pass
  return usbgpu_present(sysfs_root)


def egpu_selected(params, sysfs_root: str = USB_SYSFS_ROOT) -> bool:
  try:
    if params is not None and params.get_bool("IQEgpuDisabled"):
      return False
    if params is not None and params.get_bool("IQEgpuEnabled"):
      return True
  except Exception:
    pass
  return usbgpu_present(sysfs_root)


def resolve_backend(emac_enabled: bool, egpu_enabled: bool, egpu_present: bool = False) -> str | None:
  if egpu_present:
    return "egpu"
  if emac_enabled:
    return "emac"
  if egpu_enabled:
    return "egpu"
  return None


def egpu_pkl_path(meta: dict) -> str:
  from iqpilot.system.hardware.hw import Paths
  return os.path.join(Paths.model_root(), f"egpu_{meta['key']}_{meta['sha256'][:8]}_amd_tinygrad.pkl")


def egpu_policy_pkl_path(meta: dict) -> str:
  from iqpilot.system.hardware.hw import Paths
  return os.path.join(Paths.model_root(), f"egpu_{meta['key']}_{meta['sha256'][:8]}_amd_policy.pkl")


def egpu_oob_pkl_path(meta: dict) -> str:
  from iqpilot.system.hardware.hw import Paths
  return os.path.join(Paths.model_root(), f"egpu_{meta['key']}_{meta['sha256'][:8]}_amd_policy_oob.pkl")


def onnx_cache_path(meta: dict) -> str:
  from iqpilot.system.hardware.hw import Paths
  return os.path.join(Paths.model_root(), f"{meta['model_name']}_{meta['sha256'][:8]}.onnx")


def _sha256_file(path: str) -> str:
  digest = hashlib.sha256()
  with open(path, "rb") as f:
    while chunk := f.read(DOWNLOAD_CHUNK):
      digest.update(chunk)
  return digest.hexdigest()


def quarantine_artifact(path: str, why: str) -> None:
  try:
    if os.path.isfile(path):
      os.replace(path, path + ".unusable")
  except OSError:
    try:
      os.remove(path)
    except OSError:
      pass


def local_onnx(meta: dict) -> str | None:
  path = onnx_cache_path(meta)
  if not os.path.isfile(path):
    return None
  size = int(meta.get("download", {}).get("size", 0))
  if size and os.path.getsize(path) != size:
    quarantine_artifact(path, "onnx size mismatch")
    return None
  if _sha256_file(path) != meta["sha256"]:
    quarantine_artifact(path, "onnx sha256 mismatch")
    return None
  return path


def resolve_download_url(download_url: str, sha256: str, size: int, timeout: float = 30.0) -> str:
  if download_url.startswith("commalfs:"):
    oid = download_url.split(":", 1)[1]
    body = json.dumps({"operation": "download", "transfers": ["basic"],
                       "objects": [{"oid": oid, "size": size}]}).encode()
    req = urllib.request.Request(COMMA_LFS_BATCH_URL, data=body, headers={
      "Accept": "application/vnd.git-lfs+json", "Content-Type": "application/vnd.git-lfs+json"})
    with urllib.request.urlopen(req, timeout=timeout) as r:
      d = json.load(r)
    return d["objects"][0]["actions"]["download"]["href"]
  return download_url


def download_onnx(meta: dict, progress_cb=None) -> str:
  from iqpilot.selfdrive.iqmodeld.egpu_model import download_descriptor
  download_url, size = download_descriptor(meta)
  if not download_url:
    raise RuntimeError(f"model {meta['key']} has no download source; stage the onnx at {onnx_cache_path(meta)}")

  path = onnx_cache_path(meta)
  os.makedirs(os.path.dirname(path), exist_ok=True)
  try:
    from iqpilot.selfdrive.iqmodeld.model_bundle_downloader import download_hf_file
    return download_hf_file(f"onnx/{meta['sha256']}.onnx", path, meta["sha256"], int(size or 0), progress_cb=progress_cb)
  except Exception as e:
    cloudlog.warning(f"onnx {meta['key']} unavailable from HF ({e}); falling back to {download_url.split(':', 1)[0]}")
  url = resolve_download_url(download_url, meta["sha256"], size)
  tmp = path + ".part"
  digest = hashlib.sha256()
  got = 0
  with urllib.request.urlopen(url, timeout=60) as r, open(tmp, "wb") as f:
    while chunk := r.read(DOWNLOAD_CHUNK):
      f.write(chunk)
      digest.update(chunk)
      got += len(chunk)
      if progress_cb is not None and size:
        progress_cb(got / size)
  if size and got != size:
    os.remove(tmp)
    raise RuntimeError(f"onnx download truncated: {got}/{size} bytes")
  if digest.hexdigest() != meta["sha256"]:
    os.remove(tmp)
    raise RuntimeError(f"onnx sha256 mismatch for {meta['key']}")
  os.replace(tmp, path)
  return path


def download_precompiled(meta: dict, progress_cb=None, policy: bool = False, oob: bool = False) -> str | None:
  field = "egpu_oob_artifact" if oob else "egpu_policy_artifact" if policy else "egpu_artifact"
  art = meta.get(field)
  if not art or not (art.get("objects") or art.get("hf_path")):
    return None
  from iqpilot.selfdrive.iqmodeld.model_bundle_downloader import download_hf_file, download_lfs_bundle
  dest = egpu_oob_pkl_path(meta) if oob else egpu_policy_pkl_path(meta) if policy else egpu_pkl_path(meta)
  if art.get("hf_path"):
    try:
      return download_hf_file(art["hf_path"], dest, art["sha256"], int(art.get("size", 0)), progress_cb=progress_cb)
    except Exception as e:
      cloudlog.warning(f"precompiled {meta['key']} unavailable from HF ({e}); trying LFS")
      if not art.get("objects"):
        raise
  return download_lfs_bundle(art["objects"], dest, art["sha256"], int(art.get("size", 0)), progress_cb=progress_cb)


def patch_tinygrad_fetch_fw() -> None:
  import pathlib

  import zstandard
  from tinygrad import helpers
  if getattr(helpers.fetch_fw, "_iq_patched", False):
    return
  _orig = helpers.fetch_fw

  def fetch_fw(path, name, sha256):
    mirror = pathlib.Path(FIRMWARE_MIRROR) / path / name
    if mirror.is_file():
      blob = mirror.read_bytes()
      if hashlib.sha256(blob).hexdigest() == sha256:
        return blob
    p = pathlib.Path(f"/lib/firmware/{path}/{name}.zst")
    if p.is_file():
      blob = zstandard.ZstdDecompressor().stream_reader(p.read_bytes()).read()
      if hashlib.sha256(blob).hexdigest() == sha256:
        return blob
    blob = _orig(path, name, sha256)
    # The dock's GPU firmware otherwise lives only in tinygrad's per-user download cache, which is
    # a network fetch the first time a new HOME sees it; onroad the car is usually offline.
    try:
      mirror.parent.mkdir(parents=True, exist_ok=True)
      tmp = mirror.with_suffix(mirror.suffix + ".part")
      tmp.write_bytes(blob)
      os.replace(tmp, mirror)
    except OSError:
      pass
    return blob

  fetch_fw._iq_patched = True
  helpers.fetch_fw = fetch_fw