"""Utilities used by HTTPie tests.

"""
import os
import sys
import time
import json
import shutil
import tempfile

import httpie
from httpie.models import Environment
from httpie.core import main
from httpie.compat import bytes, str


TESTS_ROOT = os.path.abspath(os.path.dirname(__file__))
HTTPBIN_URL = os.environ.get('HTTPBIN_URL',
                             'http://httpbin.org').rstrip('/')


CRLF = '\r\n'
COLOR = '\x1b['
HTTP_OK = 'HTTP/1.1 200'
HTTP_OK_COLOR = (
    'HTTP\x1b[39m\x1b[38;5;245m/\x1b[39m\x1b'
    '[38;5;37m1.1\x1b[39m\x1b[38;5;245m \x1b[39m\x1b[38;5;37m200'
    '\x1b[39m\x1b[38;5;245m \x1b[39m\x1b[38;5;136mOK'
)


def httpbin(path):
    """
    Return a fully-qualified URL for `path`.

    >>> httpbin('/get')
    'http://httpbin.org/get'

    """
    url = HTTPBIN_URL + path
    return url


def mk_config_dir():
    return tempfile.mkdtemp(prefix='httpie_test_config_dir_')


class TestEnvironment(Environment):
    """
    Environment subclass with reasonable defaults suitable for testing.

    """
    colors = 0
    stdin_isatty = True,
    stdout_isatty = True
    is_windows = False

    _shutil = shutil  # needed by __del__ (would get gc'd)

    def __init__(self, **kwargs):

        if 'stdout' not in kwargs:
            kwargs['stdout'] = tempfile.TemporaryFile('w+b')

        if 'stderr' not in kwargs:
            kwargs['stderr'] = tempfile.TemporaryFile('w+t')

        self.delete_config_dir = False
        if 'config_dir' not in kwargs:
            kwargs['config_dir'] = mk_config_dir()
            self.delete_config_dir = True

        super(TestEnvironment, self).__init__(**kwargs)

    def __del__(self):
        if self.delete_config_dir:
            self._shutil.rmtree(self.config_dir)


def http(*args, **kwargs):
    """
    Invoke `httpie.core.main()` with `args` and `kwargs`,
    and return a `CLIResponse` subclass.

    It is either a `StrResponse`, or `BytesResponse`
    if unable to decode the output.

    The response has the following attributes:

        `stderr`: text written to stderr
        `exit_status`: the exit status
        `json`: decoded JSON (if possible) or `None`

    Exceptions are propagated except for SystemExit.

    $ http GET example.org:

        >>> r = http('GET', 'example.org')
        >>> type(r) == StrCLIResponse
        True
        >>> r.exit_status
        0
        >>> r.stderr
        ''
        >>> 'HTTP/1.1 200 OK' in r
        True
        >>> r.json is None
        True

    """
    env = kwargs.get('env')
    if not env:
        env = kwargs['env'] = TestEnvironment()

    stdout = env.stdout
    stderr = env.stderr
    args = list(args)

    if '--debug' not in args and '--traceback' not in args:
        args = ['--traceback'] + args
    try:
        try:
            exit_status = main(args=args, **kwargs)
            if '--download' in args:
                # Let the progress reporter thread finish.
                time.sleep(.5)
        except Exception:
            sys.stderr.write(stderr.read())
            raise
        except SystemExit:
            exit_status = httpie.ExitStatus.ERROR

        stdout.seek(0)
        stderr.seek(0)
        output = stdout.read()
        try:
            # noinspection PyArgumentList
            r = StrCLIResponse(output.decode('utf8'))
        except UnicodeDecodeError:
            # noinspection PyArgumentList
            r = BytesCLIResponse(output)
        r.stderr = stderr.read()
        r.exit_status = exit_status

        return r

    finally:
        stdout.close()
        stderr.close()


class BaseCLIResponse(object):
    """
    Represents the result of simulated `$ http' invocation  via `http()`.

    Holds and provides access to:

        - stdout output: print(self)
        - stderr output: print(self.stderr)
        - exit_status output: print(self.exit_status)

    """
    stderr = None
    json = None
    exit_status = None


class BytesCLIResponse(bytes, BaseCLIResponse):
    """
    Used as a fallback when a StrCLIResponse cannot be used.

    E.g. the output contains binary data. `.json` will always be None.

    """


class StrCLIResponse(str, BaseCLIResponse):

    @property
    def json(self):
        if not hasattr(self, '_json'):
            self._json = None
            # De-serialize JSON body if possible.
            if COLOR in self:
                # Colorized output cannot be parsed.
                pass
            elif self.strip().startswith('{'):
                # Looks like JSON body.
                self._json = json.loads(self)
            elif (self.count('Content-Type:') == 1
                    and 'application/json' in self):
                # Looks like a JSON HTTP message, try to extract its body.
                try:
                    j = self.strip()[self.strip().rindex('\r\n\r\n'):]
                except ValueError:
                    pass
                else:
                    try:
                        self._json = json.loads(j)
                    except ValueError:
                        pass
        return self._json