# Copyright (c) 2014-present PlatformIO <contact@platformio.org>
#
# 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 os
from os.path import isdir, isfile, join

from twisted.internet import reactor  # pylint: disable=import-error

from platformio import exception, util
from platformio.commands.debug import helpers
from platformio.commands.debug.process import BaseProcess
from platformio.proc import where_is_program


class DebugServer(BaseProcess):

    def __init__(self, debug_options, env_options):
        self.debug_options = debug_options
        self.env_options = env_options

        self._debug_port = None
        self._transport = None

    def spawn(self, patterns):  # pylint: disable=too-many-branches
        systype = util.get_systype()
        server = self.debug_options.get("server")
        if not server:
            return None
        server = self.apply_patterns(server, patterns)
        server_executable = server['executable']
        if not server_executable:
            return None
        if server['cwd']:
            server_executable = join(server['cwd'], server_executable)
        if ("windows" in systype and not server_executable.endswith(".exe")
                and isfile(server_executable + ".exe")):
            server_executable = server_executable + ".exe"

        if not isfile(server_executable):
            server_executable = where_is_program(server_executable)
        if not isfile(server_executable):
            raise exception.DebugInvalidOptions(
                "\nCould not launch Debug Server '%s'. Please check that it "
                "is installed and is included in a system PATH\n\n"
                "See documentation or contact contact@platformio.org:\n"
                "http://docs.platformio.org/page/plus/debugging.html\n" %
                server_executable)

        self._debug_port = ":3333"
        openocd_pipe_allowed = all([
            not self.debug_options['port'],
            "openocd" in server_executable
        ])  # yapf: disable
        if openocd_pipe_allowed:
            args = []
            if server['cwd']:
                args.extend(["-s", helpers.escape_path(server['cwd'])])
            args.extend([
                "-c", "gdb_port pipe; tcl_port disabled; telnet_port disabled"
            ])
            args.extend(server['arguments'])
            str_args = " ".join(
                [arg if arg.startswith("-") else '"%s"' % arg for arg in args])
            self._debug_port = '| "%s" %s' % (
                helpers.escape_path(server_executable), str_args)
        else:
            env = os.environ.copy()
            # prepend server "lib" folder to LD path
            if ("windows" not in systype and server['cwd']
                    and isdir(join(server['cwd'], "lib"))):
                ld_key = ("DYLD_LIBRARY_PATH"
                          if "darwin" in systype else "LD_LIBRARY_PATH")
                env[ld_key] = join(server['cwd'], "lib")
                if os.environ.get(ld_key):
                    env[ld_key] = "%s:%s" % (env[ld_key],
                                             os.environ.get(ld_key))
            # prepend BIN to PATH
            if server['cwd'] and isdir(join(server['cwd'], "bin")):
                env['PATH'] = "%s%s%s" % (
                    join(server['cwd'], "bin"), os.pathsep,
                    os.environ.get("PATH", os.environ.get("Path", "")))

            self._transport = reactor.spawnProcess(
                self,
                server_executable, [server_executable] + server['arguments'],
                path=server['cwd'],
                env=env)
            if "mspdebug" in server_executable.lower():
                self._debug_port = ":2000"
            elif "jlink" in server_executable.lower():
                self._debug_port = ":2331"
            elif "qemu" in server_executable.lower():
                self._debug_port = ":1234"

        return self._transport

    def get_debug_port(self):
        return self._debug_port

    def terminate(self):
        if self._transport:
            self._transport.signalProcess("KILL")