# Copyright (c) 2018, Arm Limited and affiliates.
# SPDX-License-Identifier: Apache-2.0
#
# 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.

from threading import Lock

try:
    import colorama
    COLORAMA = True
except ImportError:
    COLORAMA = False


class GreenTeaSimpleLockLogger(object):
    """! Simple locking printing mechanism
    @details We are using parallel testing
    """
    # Colors used by color(ama) terminal component
    DIM = str()
    BRIGHT = str()
    GREEN = str()
    RED = str()
    BLUE = str()
    YELLOW = str()
    RESET = str()

    def __init__(self, colors=True, use_colorama=False):
        self.use_colorama = colorama    # Should we try to use colorama
        self.colorful(colors)           # Set and use colours for formatting

        # Mutext used to protect logger prints
        # Usage:
        # GREENTEA_LOG_MUTEX.acquire(1)
        # GREENTEA_LOG_MUTEX.release()
        self.GREENTEA_LOG_MUTEX = Lock()

        if self.colors:
            if not self.use_colorama:
                self.gt_log("Colorful console output is disabled")
            else:
                colorama.init()

    def colorful(self, colors):
        """! Enable/Disable colourful printing
        """
        self.colors = colors
        if self.colors:
            self.__set_colors()
        else:
            self.__clear_colors()

    def __set_colors(self):
        """! Zeroes colours used for formatting
        """
        if self.use_colorama:
            self.DIM = colorama.Style.DIM
            self.BRIGHT = colorama.Style.BRIGHT
            self.GREEN = colorama.Fore.GREEN
            self.RED = colorama.Fore.RED
            self.BLUE = colorama.Fore.BLUE
            self.YELLOW = colorama.Fore.YELLOW
            self.RESET = colorama.Style.RESET_ALL

    def __clear_colors(self):
        """! Zeroes colours used for formatting
        """
        self.DIM = str()
        self.BRIGHT = str()
        self.GREEN = str()
        self.RED = str()
        self.BLUE = str()
        self.YELLOW = str()
        self.RESET =  str()

    def __print(self, text):
        """! Mutex protected print
        """
        self.GREENTEA_LOG_MUTEX.acquire(1)
        print(text)
        self.GREENTEA_LOG_MUTEX.release()

    def gt_log(self, text, print_text=True):
        """! Prints standard log message (in colour if colorama is installed)
        @param print_text Forces log function to print on screen (not only return message)
        @return Returns string with message
        """
        result = self.GREEN + self.BRIGHT + "mbedgt: " + self.RESET + text
        if print_text:
            self.__print(result)
        return result

    def gt_log_tab(self, text, tab_count=1, print_text=True):
        """! Prints standard log message with one (1) tab margin on the left
        @param tab_count How many tags should be added (indent level)
        @param print_text Forces log function to print on screen (not only return message)
        @return Returns string with message
        """
        result = "\t"*tab_count + text
        if print_text:
            self.__print(result)
        return result

    def gt_log_err(self, text, print_text=True):
        """! Prints error log message (in color if colorama is installed)
        @param print_text Forces log function to print on screen (not only return message)
        @return Returns string with message
        """
        result = self.RED + self.BRIGHT + "mbedgt: " + self.RESET + text
        if print_text:
            self.__print(result)
        return result

    def gt_log_warn(self, text, print_text=True):
        """! Prints error log message (in color if colorama is installed)
        @param print_text Forces log function to print on screen (not only return message)
        @return Returns string with message
        """
        result = self.YELLOW + "mbedgt: " + self.RESET + text
        if print_text:
            self.__print(result)
        return result

    def gt_bright(self, text):
        """! Created bright text using colorama
        @return Returns string with additional BRIGHT color codes
        """
        if not text:
            text = ''
        return self.BLUE + self.BRIGHT + text + self.RESET

gt_logger = GreenTeaSimpleLockLogger(use_colorama=COLORAMA)