import json
import platform
import subprocess
import sys

from third_party import cpuinfo


def _getBlenderDeviceInfo(ctx):
    PREFIX = "Benchmark Devices: "
    command = [ctx.blender,
               "--background",
               "--factory-startup",
               "-noaudio",
               "--enable-autoexec",
               "--engine", "CYCLES",
               "--python", ctx.configure_script,
               "--",
               "--benchmark-system-info"]
    process = subprocess.Popen(command,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.STDOUT)
    stdout, stderr = process.communicate()
    lines = stdout.decode().split("\n")
    for line in lines:
        if line.startswith(PREFIX):
            return json.loads(line[len(PREFIX):])
    return []


def getBlenderVersion(ctx):
    INFO = ("build_date",
            "build_time",
            "build_commit_date",
            "build_commit_time",
            "build_hash")
    command = [ctx.blender, "--version"]
    process = subprocess.Popen(command,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.STDOUT)
    stdout, stderr = process.communicate()
    lines = stdout.decode().split("\n")
    info = {}
    for line in lines:
        line = line.strip()
        if line.startswith("Blender "):
            version = line[8:].strip()
            info['version'] = version
        if not line.startswith("build "):
            continue
        tokens = line.split(":", 1)
        tokens[0] = tokens[0].replace(" ", "_")
        if tokens[0] in INFO:
            info[tokens[0]] = tokens[1].strip()
    return info


def getNumPhysicalCPUs_Linux():
    ids = set()
    with open("/proc/cpuinfo") as f:
        for line in f.readlines():
            if line.startswith("physical id"):
                id = int(line.split(":", 1)[1])
                ids.add(id)
    return len(ids)


def getNumPhysicalCPUs():
    if sys.platform == 'linux':
        return getNumPhysicalCPUs_Linux()
    elif sys.platform == 'win32':
        # TODO(sergey): Currently all WIndows machines here are single socket.
        return 1
    else:
        raise Exception("Needs implementation")


def gatherSystemInfo(ctx):
    import psutil
    system_info = {}
    system_info['bitness'] = platform.architecture()[0]
    system_info['machine'] = platform.machine()
    system_info['system'] = platform.system()
    if system_info['system'] == "Linux":
        distro = platform.linux_distribution()
        system_info['dist_name'] = distro[0]
        system_info['dist_version'] = distro[1]
        # system_info['libc_version'] = "-".join(platform.libc_ver())
    # TODO(sergey): Make this to work on Windows and macOS
    cpu_info = cpuinfo.get_cpu_info()
    system_info['cpu_brand'] = cpu_info['brand']
    system_info["num_cpu_cores"] = psutil.cpu_count(logical=False)
    system_info["num_cpu_threads"] = psutil.cpu_count(logical=True)
    system_info["num_cpu_sockets"] = getNumPhysicalCPUs()
    system_info['devices'] = _getBlenderDeviceInfo(ctx)
    # TODO(sergey): query number of CPUs and threads.
    return system_info