"""GPU/CPU detection and VRAM estimation."""

from __future__ import annotations

import os
import sys
from dataclasses import dataclass


@dataclass
class HardwareInfo:
    """Detected hardware capabilities."""

    has_cuda: bool = False
    cuda_device_name: str = ""
    vram_mb: int = 0
    ram_mb: int = 0
    cpu_cores: int = 0
    recommended_model: str = "base"
    recommended_device: str = "cpu"
    recommended_compute_type: str = "int8"


def detect_hardware() -> HardwareInfo:
    """Detect available hardware and recommend model configuration."""
    info = HardwareInfo()

    # CPU info
    info.cpu_cores = os.cpu_count() or 1

    # RAM info
    try:
        with open("/proc/meminfo") as f:
            for line in f:
                if line.startswith("MemTotal:"):
                    # Value is in kB
                    info.ram_mb = int(line.split()[1]) // 1024
                    break
    except (FileNotFoundError, ValueError):
        pass

    # CUDA detection
    try:
        import torch

        if torch.cuda.is_available():
            info.has_cuda = True
            info.cuda_device_name = torch.cuda.get_device_name(0)
            info.vram_mb = torch.cuda.get_device_properties(0).total_mem // (1024 * 1024)
    except ImportError:
        print("[sidecar] torch not available, GPU detection skipped", file=sys.stderr, flush=True)

    # Model recommendation based on hardware
    if info.has_cuda and info.vram_mb >= 8000:
        info.recommended_model = "large-v3-turbo"
        info.recommended_device = "cuda"
        info.recommended_compute_type = "int8"
    elif info.has_cuda and info.vram_mb >= 4000:
        info.recommended_model = "medium"
        info.recommended_device = "cuda"
        info.recommended_compute_type = "int8"
    elif info.ram_mb >= 16000:
        info.recommended_model = "medium"
        info.recommended_device = "cpu"
        info.recommended_compute_type = "int8"
    elif info.ram_mb >= 8000:
        info.recommended_model = "small"
        info.recommended_device = "cpu"
        info.recommended_compute_type = "int8"
    else:
        info.recommended_model = "base"
        info.recommended_device = "cpu"
        info.recommended_compute_type = "int8"

    return info