# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import absolute_import, print_function, unicode_literals

import os
import logging

from mach.decorators import (
    Command,
    CommandArgument,
    CommandArgumentGroup,
    CommandProvider,
)

from mozbuild.base import MachCommandBase, BinaryNotFoundException


@CommandProvider
class GeckoDriver(MachCommandBase):
    @Command(
        "geckodriver",
        category="post-build",
        description="Run the WebDriver implementation for Gecko.",
    )
    @CommandArgument(
        "--binary", type=str, help="Firefox binary (defaults to the local build)."
    )
    @CommandArgument(
        "params", nargs="...", help="Flags to be passed through to geckodriver."
    )
    @CommandArgumentGroup("debugging")
    @CommandArgument(
        "--debug",
        action="store_true",
        group="debugging",
        help="Enable the debugger. Not specifying a --debugger "
        "option will result in the default debugger "
        "being used.",
    )
    @CommandArgument(
        "--debugger",
        default=None,
        type=str,
        group="debugging",
        help="Name of debugger to use.",
    )
    @CommandArgument(
        "--debugger-args",
        default=None,
        metavar="params",
        type=str,
        group="debugging",
        help="Flags to pass to the debugger itself; "
        "split as the Bourne shell would.",
    )
    def run(self, binary, params, debug, debugger, debugger_args):
        try:
            binpath = self.get_binary_path("geckodriver")
        except BinaryNotFoundException as e:
            self.log(logging.ERROR, "geckodriver", {"error": str(e)}, "ERROR: {error}")
            self.log(
                logging.INFO,
                "geckodriver",
                {},
                "It looks like geckodriver isn't built. "
                "Add ac_add_options --enable-geckodriver to your "
                "mozconfig "
                "and run |./mach build| to build it.",
            )
            return 1

        args = [binpath]

        if params:
            args.extend(params)

        if binary is None:
            try:
                binary = self.get_binary_path("app")
            except BinaryNotFoundException as e:
                self.log(
                    logging.ERROR, "geckodriver", {"error": str(e)}, "ERROR: {error}"
                )
                self.log(logging.INFO, "geckodriver", {"help": e.help()}, "{help}")
                return 1

        args.extend(["--binary", binary])

        if debug or debugger or debugger_args:
            if "INSIDE_EMACS" in os.environ:
                self.log_manager.terminal_handler.setLevel(logging.WARNING)

            import mozdebug

            if not debugger:
                # No debugger name was provided. Look for the default ones on
                # current OS.
                debugger = mozdebug.get_default_debugger_name(
                    mozdebug.DebuggerSearch.KeepLooking
                )

            if debugger:
                self.debuggerInfo = mozdebug.get_debugger_info(debugger, debugger_args)
                if not self.debuggerInfo:
                    print("Could not find a suitable debugger in your PATH.")
                    return 1

            # Parameters come from the CLI. We need to convert them before
            # their use.
            if debugger_args:
                from mozbuild import shellutil

                try:
                    debugger_args = shellutil.split(debugger_args)
                except shellutil.MetaCharacterException as e:
                    print(
                        "The --debugger-args you passed require a real shell to parse them."
                    )
                    print("(We can't handle the %r character.)" % e.char)
                    return 1

            # Prepend the debugger args.
            args = [self.debuggerInfo.path] + self.debuggerInfo.args + args

        return self.run_process(args=args, ensure_exit_code=False, pass_thru=True)