# Copyright 2015-2021 Espressif Systems (Shanghai) CO LTD
#
# 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 datetime
import os
import re
from typing import BinaryIO, Callable, Optional, Union  # noqa: F401

from serial.tools import miniterm  # noqa: F401

from .constants import MATCH_PCADDR
from .output_helpers import lookup_pc_address, red_print, yellow_print


class Logger:
    def __init__(self, elf_file, console, timestamps, timestamp_format, pc_address_buffer, enable_address_decoding,
                 toolchain_prefix):
        # type: (str, miniterm.Console, bool, str, bytes, bool, str) -> None
        self.log_file = None  # type: Optional[BinaryIO]
        self._output_enabled = True  # type: bool
        self.elf_file = elf_file
        self.console = console
        self.timestamps = timestamps
        self.timestamp_format = timestamp_format
        self._pc_address_buffer = pc_address_buffer
        self.enable_address_decoding = enable_address_decoding
        self.toolchain_prefix = toolchain_prefix

    @property
    def pc_address_buffer(self):  # type: () -> bytes
        return self._pc_address_buffer

    @pc_address_buffer.setter
    def pc_address_buffer(self, value):  # type: (bytes) -> None
        self._pc_address_buffer = value

    @property
    def output_enabled(self):  # type: () -> bool
        return self._output_enabled

    @output_enabled.setter
    def output_enabled(self, value):  # type: (bool) -> None
        self._output_enabled = value

    @property
    def log_file(self):  # type: () -> Optional[BinaryIO]
        return self._log_file

    @log_file.setter
    def log_file(self, value):  # type: (Optional[BinaryIO]) -> None
        self._log_file = value

    def toggle_logging(self):  # type: () -> None
        if self._log_file:
            self.stop_logging()
        else:
            self.start_logging()

    def toggle_timestamps(self):  # type: () -> None
        self.timestamps = not self.timestamps

    def start_logging(self):  # type: () -> None
        if not self._log_file:
            name = 'log.{}.{}.txt'.format(os.path.splitext(os.path.basename(self.elf_file))[0],
                                          datetime.datetime.now().strftime('%Y%m%d%H%M%S'))
            try:
                self.log_file = open(name, 'wb+')
                yellow_print('\nLogging is enabled into file {}'.format(name))
            except Exception as e:  # noqa
                red_print('\nLog file {} cannot be created: {}'.format(name, e))

    def stop_logging(self):  # type: () -> None
        if self._log_file:
            try:
                name = self._log_file.name
                self._log_file.close()
                yellow_print('\nLogging is disabled and file {} has been closed'.format(name))
            except Exception as e:  # noqa
                red_print('\nLog file cannot be closed: {}'.format(e))
            finally:
                self._log_file = None

    def print(self, string, console_printer=None):  # noqa: E999
        # type: (Union[str, bytes], Optional[Callable]) -> None
        if console_printer is None:
            console_printer = self.console.write_bytes

        if self.timestamps and (self._output_enabled or self._log_file):
            t = datetime.datetime.now().strftime(self.timestamp_format)
            # "string" is not guaranteed to be a full line. Timestamps should be only at the beginning of lines.
            if isinstance(string, type(u'')):
                search_patt = '\n'
                replacement = '\n' + t + ' '
            else:
                search_patt = b'\n'  # type: ignore
                replacement = b'\n' + t.encode('ascii') + b' '  # type: ignore
            string = string.replace(search_patt, replacement)  # type: ignore
        if self._output_enabled:
            console_printer(string)
        if self._log_file:
            try:
                if isinstance(string, type(u'')):
                    string = string.encode()  # type: ignore
                self._log_file.write(string)  # type: ignore
            except Exception as e:
                red_print('\nCannot write to file: {}'.format(e))
                # don't fill-up the screen with the previous errors (probably consequent prints would fail also)
                self.stop_logging()

    def output_toggle(self):  # type: () -> None
        self.output_enabled = not self.output_enabled
        yellow_print('\nToggle output display: {}, Type Ctrl-T Ctrl-Y to show/disable output again.'.format(
            self.output_enabled))

    def handle_possible_pc_address_in_line(self, line):  # type: (bytes) -> None
        line = self._pc_address_buffer + line
        self._pc_address_buffer = b''
        if not self.enable_address_decoding:
            return
        for m in re.finditer(MATCH_PCADDR, line.decode(errors='ignore')):
            translation = lookup_pc_address(m.group(), self.toolchain_prefix, self.elf_file)
            if translation:
                self.print(translation, console_printer=yellow_print)