# 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/.

import argparse
import copy
import os

from mozbuild.base import (
    BuildEnvironmentNotFoundException,
    MachCommandBase,
)


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


here = os.path.abspath(os.path.dirname(__file__))
EXCLUSION_FILES = [
    os.path.join("tools", "rewriting", "Generated.txt"),
    os.path.join("tools", "rewriting", "ThirdPartyPaths.txt"),
]

EXCLUSION_FILES_OPTIONAL = []
thunderbird_excludes = os.path.join("comm", "tools", "lint", "GlobalExclude.txt")
if os.path.exists(thunderbird_excludes):
    EXCLUSION_FILES_OPTIONAL.append(thunderbird_excludes)

GLOBAL_EXCLUDES = [
    "node_modules",
    "tools/lint/test/files",
]


def setup_argument_parser():
    from mozlint import cli

    return cli.MozlintParser()


def get_global_excludes(topsrcdir):
    # exclude misc paths
    excludes = GLOBAL_EXCLUDES[:]

    # exclude top level paths that look like objdirs
    excludes.extend(
        [
            name
            for name in os.listdir(topsrcdir)
            if name.startswith("obj") and os.path.isdir(name)
        ]
    )

    for path in EXCLUSION_FILES + EXCLUSION_FILES_OPTIONAL:
        with open(os.path.join(topsrcdir, path), "r") as fh:
            excludes.extend([f.strip() for f in fh.readlines()])

    return excludes


@CommandProvider
class MachCommands(MachCommandBase):
    @Command(
        "lint",
        category="devenv",
        description="Run linters.",
        parser=setup_argument_parser,
    )
    def lint(self, *runargs, **lintargs):
        """Run linters."""
        self.activate_virtualenv()
        from mozlint import cli, parser

        try:
            buildargs = {}
            buildargs["substs"] = copy.deepcopy(dict(self.substs))
            buildargs["defines"] = copy.deepcopy(dict(self.defines))
            buildargs["topobjdir"] = self.topobjdir
            lintargs.update(buildargs)
        except BuildEnvironmentNotFoundException:
            pass

        lintargs.setdefault("root", self.topsrcdir)
        lintargs["exclude"] = get_global_excludes(lintargs["root"])
        lintargs["config_paths"].insert(0, here)
        lintargs["virtualenv_bin_path"] = self.virtualenv_manager.bin_path
        lintargs["virtualenv_manager"] = self.virtualenv_manager
        for path in EXCLUSION_FILES:
            parser.GLOBAL_SUPPORT_FILES.append(os.path.join(self.topsrcdir, path))
        return cli.run(*runargs, **lintargs)

    @Command(
        "eslint",
        category="devenv",
        description="Run eslint or help configure eslint for optimal development.",
    )
    @CommandArgument(
        "paths",
        default=None,
        nargs="*",
        help="Paths to file or directories to lint, like "
        "'browser/' Defaults to the "
        "current directory if not given.",
    )
    @CommandArgument(
        "-s",
        "--setup",
        default=False,
        action="store_true",
        help="Configure eslint for optimal development.",
    )
    @CommandArgument("-b", "--binary", default=None, help="Path to eslint binary.")
    @CommandArgument(
        "--fix",
        default=False,
        action="store_true",
        help="Request that eslint automatically fix errors, where possible.",
    )
    @CommandArgument(
        "extra_args",
        nargs=argparse.REMAINDER,
        help="Extra args that will be forwarded to eslint.",
    )
    def eslint(self, paths, extra_args=[], **kwargs):
        self._mach_context.commands.dispatch(
            "lint",
            self._mach_context,
            linters=["eslint"],
            paths=paths,
            argv=extra_args,
            **kwargs
        )