# Copyright (C) Ivan Kravets <me@ikravets.com>
# See LICENSE for details.

from os import name as os_name
from os import getcwd, getenv, listdir, utime
from os.path import dirname, expanduser, isfile, join, realpath
from platform import system, uname
from subprocess import PIPE, Popen
from time import sleep

from requests import get, post
from requests.exceptions import ConnectionError, HTTPError
from requests.utils import default_user_agent
from serial import Serial

from platformio import __apiurl__, __version__
from platformio.exception import (APIRequestError, GetSerialPortsError,
                                  NotPlatformProject)

try:
    from configparser import ConfigParser
except ImportError:
    from ConfigParser import ConfigParser


def get_systype():
    if system() == "Windows":
        return "windows"
    data = uname()
    return ("%s_%s" % (data[0], data[4])).lower()


def get_home_dir():
    try:
        config = get_project_config()
        if (config.has_section("platformio") and
                config.has_option("platformio", "home_dir")):
            return config.get("platformio", "home_dir")
    except NotPlatformProject:
        pass
    return expanduser("~/.platformio")


def get_lib_dir():
    try:
        config = get_project_config()
        if (config.has_section("platformio") and
                config.has_option("platformio", "lib_dir")):
            lib_dir = config.get("platformio", "lib_dir")
            if lib_dir.startswith("~"):
                return expanduser(lib_dir)
            else:
                return lib_dir
    except NotPlatformProject:
        pass
    return join(get_home_dir(), "lib")


def get_source_dir():
    return dirname(realpath(__file__))


def get_project_dir():
    return getcwd()


def get_pioenvs_dir():
    return getenv("PIOENVS_DIR", join(get_project_dir(), ".pioenvs"))


def get_project_config():
    path = join(get_project_dir(), "platformio.ini")
    if not isfile(path):
        raise NotPlatformProject()
    cp = ConfigParser()
    cp.read(path)
    return cp


def get_platforms():
    platforms = []
    for p in listdir(join(get_source_dir(), "platforms")):
        if p in ("__init__.py", "base.py") or not p.endswith(".py"):
            continue
        platforms.append(p[:-3])
    return platforms


def change_filemtime(path, time):
    utime(path, (time, time))


def exec_command(args):
    use_shell = system() == "Windows"
    p = Popen(args, stdout=PIPE, stderr=PIPE, shell=use_shell)
    out, err = p.communicate()
    return dict(out=out.strip(), err=err.strip())


def reset_serialport(port):
    s = Serial(port)
    s.flushInput()
    s.setDTR(False)
    s.setRTS(False)
    sleep(0.1)
    s.setDTR(True)
    s.setRTS(True)
    s.close()


def get_serialports():
    if os_name == "nt":
        from serial.tools.list_ports_windows import comports
    elif os_name == "posix":
        from serial.tools.list_ports_posix import comports
    else:
        raise GetSerialPortsError(os_name)
    return[{"port": p, "description": d, "hwid": h} for p, d, h in comports()]


def get_api_result(path, params=None, data=None):
    result = None
    r = None
    try:
        headers = {"User-Agent": "PlatformIO/%s %s" % (
            __version__, default_user_agent())}
        if data:
            r = post(__apiurl__ + path, params=params, data=data,
                     headers=headers)
        else:
            r = get(__apiurl__ + path, params=params, headers=headers)
        result = r.json()
        r.raise_for_status()
    except HTTPError as e:
        if result and "errors" in result:
            raise APIRequestError(result['errors'][0]['title'])
        else:
            raise APIRequestError(e)
    except ConnectionError:
        raise APIRequestError(
            "Could not connect to PlatformIO Registry Service")
    except ValueError:
        raise APIRequestError("Invalid response: %s" % r.text)
    finally:
        if r:
            r.close()
    return result