#
# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import sys
from time import time


class Progress(object):
    def __init__(self, title, total=0):
        self._title = title
        self._total = total
        self._done = 0
        self._lastp = -1
        self._start = time()
        self._show = False
        self._width = 0

    def update(self, inc=1, extra=""):
        self._done += inc

        if not self._show:
            if 0.5 <= time() - self._start:
                self._show = True
            else:
                return

        text = None

        if self._total <= 0:
            text = "%s: %3d" % (self._title, self._done)
        else:
            p = (100 * self._done) / self._total

            if self._lastp != p:
                self._lastp = p
                text = "%s: %3d%% (%2d/%2d)" % (
                    self._title,
                    p,
                    self._done,
                    self._total,
                )

        if text:
            text += " " + extra
            text = text[: self.terminal_width()]  # Avoid wrapping
            spaces = max(self._width - len(text), 0)
            sys.stdout.write("%s%*s\r" % (text, spaces, ""))
            sys.stdout.flush()
            self._width = len(text)

    def end(self):
        if not self._show:
            return

        if self._total <= 0:
            text = "%s: %d, done." % (self._title, self._done)
        else:
            p = (100 * self._done) / self._total
            text = "%s: %3d%% (%d/%d), done." % (
                self._title,
                p,
                self._done,
                self._total,
            )

        spaces = max(self._width - len(text), 0)
        sys.stdout.write("%s%*s\n" % (text, spaces, ""))
        sys.stdout.flush()

    def terminal_width(self):
        """Returns sys.maxsize if the width cannot be determined."""
        try:
            if not sys.stdout.isatty():
                return sys.maxsize
            if sys.platform == "win32":
                import ctypes

                class CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure):
                    _fields_ = [
                        ("dwSize", ctypes.wintypes._COORD),
                        ("dwCursorPosition", ctypes.wintypes._COORD),
                        ("wAttributes", ctypes.c_ushort),
                        ("srWindow", ctypes.wintypes._SMALL_RECT),
                        ("dwMaximumWindowSize", ctypes.wintypes._COORD),
                    ]

                # Get our own instance of the kernel lib since python
                # libraries and python ports are known to manipulate
                # ctypes.windll.kernel32. See
                # https://github.com/pallets/click/issues/126
                kernel32 = ctypes.WinDLL("kernel32")
                handle = kernel32.GetStdHandle(-12)  # -12 == stderr
                console_screen_buffer_info = CONSOLE_SCREEN_BUFFER_INFO()
                if kernel32.GetConsoleScreenBufferInfo(
                    ctypes.c_ulong(handle),
                    ctypes.byref(console_screen_buffer_info),
                ):
                    # Note that we return 1 less than the width since writing into
                    # the rightmost column automatically performs a line feed.
                    right = console_screen_buffer_info.srWindow.Right
                    left = console_screen_buffer_info.srWindow.Left
                    return right - left
                return sys.maxsize
            else:
                import fcntl
                import struct
                import termios

                packed = fcntl.ioctl(
                    sys.stderr.fileno(), termios.TIOCGWINSZ, "\0" * 8
                )
                _, columns, _, _ = struct.unpack("HHHH", packed)
                return columns
        except Exception:
            return sys.maxsize
