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

import json
import os
import re
import subprocess
from os.path import (abspath, basename, dirname, expanduser, isdir, isfile,
                     join, realpath)
from platform import system, uname
from threading import Thread

import requests

from platformio import __apiurl__, __version__, exception

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


class AsyncPipe(Thread):

    def __init__(self, outcallback=None):
        Thread.__init__(self)
        self.outcallback = outcallback

        self._fd_read, self._fd_write = os.pipe()
        self._pipe_reader = os.fdopen(self._fd_read)
        self._buffer = []

        self.start()

    def get_buffer(self):
        return self._buffer

    def fileno(self):
        return self._fd_write

    def run(self):
        for line in iter(self._pipe_reader.readline, ""):
            line = line.strip()
            self._buffer.append(line)
            if self.outcallback:
                self.outcallback(line)
            else:
                print line
        self._pipe_reader.close()

    def close(self):
        os.close(self._fd_write)
        self.join()


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


def pioversion_to_intstr():
    vermatch = re.match(r"^([\d\.]+)", __version__)
    assert vermatch
    return [int(i) for i in vermatch.group(1).split(".")[:3]]


def _get_projconf_option_dir(name, default=None):
    _env_name = "PLATFORMIO_%s" % name.upper()
    if _env_name in os.environ:
        return os.getenv(_env_name)

    try:
        config = get_project_config()
        if (config.has_section("platformio") and
                config.has_option("platformio", name)):
            option_dir = config.get("platformio", name)
            if option_dir.startswith("~"):
                option_dir = expanduser(option_dir)
            return abspath(option_dir)
    except exception.NotPlatformProject:
        pass
    return default


def get_home_dir():
    home_dir = _get_projconf_option_dir(
        "home_dir",
        join(expanduser("~"), ".platformio")
    )

    if not isdir(home_dir):
        os.makedirs(home_dir)

    assert isdir(home_dir)
    return home_dir


def get_lib_dir():
    return _get_projconf_option_dir(
        "lib_dir",
        join(get_home_dir(), "lib")
    )


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


def get_project_dir():
    return os.getcwd()


def get_projectsrc_dir():
    return _get_projconf_option_dir(
        "src_dir",
        join(get_project_dir(), "src")
    )


def get_pioenvs_dir():
    return _get_projconf_option_dir(
        "envs_dir",
        join(get_project_dir(), ".pioenvs")
    )


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


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


def exec_command(*args, **kwargs):
    result = {
        "out": None,
        "err": None,
        "returncode": None
    }

    default = dict(
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        shell=system() == "Windows"
    )
    default.update(kwargs)
    kwargs = default

    p = subprocess.Popen(*args, **kwargs)
    try:
        result['out'], result['err'] = p.communicate()
        result['returncode'] = p.returncode
    except KeyboardInterrupt:
        raise exception.AbortedByUser()
    finally:
        for s in ("stdout", "stderr"):
            if isinstance(kwargs[s], AsyncPipe):
                kwargs[s].close()

    for s in ("stdout", "stderr"):
        if isinstance(kwargs[s], AsyncPipe):
            result[s[3:]] = "\n".join(kwargs[s].get_buffer())

    for k, v in result.iteritems():
        if v and isinstance(v, basestring):
            result[k].strip()

    return result


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 exception.GetSerialPortsError(os.name)
    return [{"port": p, "description": d, "hwid": h} for p, d, h in comports()]


def get_logicaldisks():
    disks = []
    if system() == "Windows":
        result = exec_command(
            ["wmic", "logicaldisk", "get", "name,VolumeName"]).get("out")
        disknamere = re.compile(r"^([A-Z]{1}\:)\s*(\S+)?")
        for line in result.split("\n"):
            match = disknamere.match(line.strip())
            if not match:
                continue
            disks.append({"disk": match.group(1), "name": match.group(2)})
    else:
        result = exec_command(["df"]).get("out")
        disknamere = re.compile(r"\d+\%\s+([a-z\d\-_/]+)$", flags=re.I)
        for line in result.split("\n"):
            match = disknamere.search(line.strip())
            if not match:
                continue
            disks.append({"disk": match.group(1),
                          "name": basename(match.group(1))})
    return disks


def get_api_result(path, params=None, data=None):
    result = None
    r = None

    try:
        headers = {"User-Agent": "PlatformIO/%s %s" % (
            __version__, requests.utils.default_user_agent())}

        if data:
            r = requests.post(__apiurl__ + path, params=params, data=data,
                              headers=headers)
        else:
            r = requests.get(__apiurl__ + path, params=params, headers=headers)
        result = r.json()
        r.raise_for_status()
    except requests.exceptions.HTTPError as e:
        if result and "errors" in result:
            raise exception.APIRequestError(result['errors'][0]['title'])
        else:
            raise exception.APIRequestError(e)
    except requests.exceptions.ConnectionError:
        raise exception.APIRequestError(
            "Could not connect to PlatformIO Registry Service")
    except ValueError:
        raise exception.APIRequestError(
            "Invalid response: %s" % r.text.encode("utf-8"))
    finally:
        if r:
            r.close()
    return result


def get_boards(type_=None):
    boards = {}
    try:
        boards = get_boards._cache  # pylint: disable=W0212
    except AttributeError:
        bdirs = [join(get_source_dir(), "boards")]
        if isdir(join(get_home_dir(), "boards")):
            bdirs.append(join(get_home_dir(), "boards"))

        for bdir in bdirs:
            for json_file in os.listdir(bdir):
                if not json_file.endswith(".json"):
                    continue
                with open(join(bdir, json_file)) as f:
                    boards.update(json.load(f))
        get_boards._cache = boards  # pylint: disable=W0212

    if type_ is None:
        return boards
    else:
        if type_ not in boards:
            raise exception.UnknownBoard(type_)
        return boards[type_]


def get_frameworks(type_=None):
    frameworks = {}

    try:
        frameworks = get_frameworks._cache  # pylint: disable=W0212
    except AttributeError:
        frameworks_path = join(
            get_source_dir(), "builder", "scripts", "frameworks")

        frameworks_list = [f[:-3] for f in os.listdir(frameworks_path)
                           if not f.startswith("__") and f.endswith(".py")]
        for _type in frameworks_list:
            script_path = join(frameworks_path, "%s.py" % _type)
            with open(script_path) as f:
                fcontent = f.read()
                assert '"""' in fcontent
                _doc_start = fcontent.index('"""') + 3
                fdoc = fcontent[
                    _doc_start:fcontent.index('"""', _doc_start)].strip()
                doclines = [l.strip() for l in fdoc.splitlines() if l.strip()]
                frameworks[_type] = {
                    "name": doclines[0],
                    "description": " ".join(doclines[1:-1]),
                    "url": doclines[-1],
                    "script": script_path
                }
        get_frameworks._cache = frameworks  # pylint: disable=W0212

    if type_ is None:
        return frameworks
    else:
        if type_ not in frameworks:
            raise exception.UnknownFramework(type_)
        return frameworks[type_]

    return frameworks