# Copyright 2020 The Meson development team

# 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 __future__ import annotations

from pathlib import Path
import os
import shlex
import subprocess
import typing as T

from . import ExtensionModule, ModuleReturnValue, NewExtensionModule, ModuleInfo
from .. import mlog, build
from ..compilers.compilers import CFLAGS_MAPPING
from ..envconfig import ENV_VAR_PROG_MAP
from ..dependencies import InternalDependency
from ..dependencies.pkgconfig import PkgConfigInterface
from ..interpreterbase import FeatureNew
from ..interpreter.type_checking import ENV_KW, DEPENDS_KW
from ..interpreterbase.decorators import ContainerTypeInfo, KwargInfo, typed_kwargs, typed_pos_args
from ..mesonlib import (EnvironmentException, MesonException, Popen_safe, MachineChoice,
                        get_variable_regex, do_replacement, join_args, OptionKey)

if T.TYPE_CHECKING:
    from typing_extensions import TypedDict

    from . import ModuleState
    from .._typing import ImmutableListProtocol
    from ..build import BuildTarget, CustomTarget
    from ..interpreter import Interpreter
    from ..interpreterbase import TYPE_var
    from ..mesonlib import EnvironmentVariables
    from ..utils.core import EnvironOrDict

    class Dependency(TypedDict):

        subdir: str

    class AddProject(TypedDict):

        configure_options: T.List[str]
        cross_configure_options: T.List[str]
        verbose: bool
        env: EnvironmentVariables
        depends: T.List[T.Union[BuildTarget, CustomTarget]]


class ExternalProject(NewExtensionModule):

    make: ImmutableListProtocol[str]

    def __init__(self,
                 state: 'ModuleState',
                 configure_command: str,
                 configure_options: T.List[str],
                 cross_configure_options: T.List[str],
                 env: EnvironmentVariables,
                 verbose: bool,
                 extra_depends: T.List[T.Union['BuildTarget', 'CustomTarget']]):
        super().__init__()
        self.methods.update({'dependency': self.dependency_method,
                             })

        self.subdir = Path(state.subdir)
        self.project_version = state.project_version
        self.subproject = state.subproject
        self.env = state.environment
        self.build_machine = state.build_machine
        self.host_machine = state.host_machine
        self.configure_command = configure_command
        self.configure_options = configure_options
        self.cross_configure_options = cross_configure_options
        self.verbose = verbose
        self.user_env = env

        self.src_dir = Path(self.env.get_source_dir(), self.subdir)
        self.build_dir = Path(self.env.get_build_dir(), self.subdir, 'build')
        self.install_dir = Path(self.env.get_build_dir(), self.subdir, 'dist')
        _p = self.env.coredata.get_option(OptionKey('prefix'))
        assert isinstance(_p, str), 'for mypy'
        self.prefix = Path(_p)
        _l = self.env.coredata.get_option(OptionKey('libdir'))
        assert isinstance(_l, str), 'for mypy'
        self.libdir = Path(_l)
        _i = self.env.coredata.get_option(OptionKey('includedir'))
        assert isinstance(_i, str), 'for mypy'
        self.includedir = Path(_i)
        self.name = self.src_dir.name

        # On Windows if the prefix is "c:/foo" and DESTDIR is "c:/bar", `make`
        # will install files into "c:/bar/c:/foo" which is an invalid path.
        # Work around that issue by removing the drive from prefix.
        if self.prefix.drive:
            self.prefix = self.prefix.relative_to(self.prefix.drive)

        # self.prefix is an absolute path, so we cannot append it to another path.
        self.rel_prefix = self.prefix.relative_to(self.prefix.root)

        self._configure(state)

        self.targets = self._create_targets(extra_depends)

    def _configure(self, state: 'ModuleState') -> None:
        if self.configure_command == 'waf':
            FeatureNew('Waf external project', '0.60.0').use(self.subproject, state.current_node)
            waf = state.find_program('waf')
            configure_cmd = waf.get_command()
            configure_cmd += ['configure', '-o', str(self.build_dir)]
            workdir = self.src_dir
            self.make = waf.get_command() + ['build']
        else:
            # Assume it's the name of a script in source dir, like 'configure',
            # 'autogen.sh', etc).
            configure_path = Path(self.src_dir, self.configure_command)
            configure_prog = state.find_program(configure_path.as_posix())
            configure_cmd = configure_prog.get_command()
            workdir = self.build_dir
            self.make = state.find_program('make').get_command()

        d = [('PREFIX', '--prefix=@PREFIX@', self.prefix.as_posix()),
             ('LIBDIR', '--libdir=@PREFIX@/@LIBDIR@', self.libdir.as_posix()),
             ('INCLUDEDIR', None, self.includedir.as_posix()),
             ]
        self._validate_configure_options(d, state)

        configure_cmd += self._format_options(self.configure_options, d)

        if self.env.is_cross_build():
            host = '{}-{}-{}'.format(self.host_machine.cpu_family,
                                     self.build_machine.system,
                                     self.host_machine.system)
            d = [('HOST', None, host)]
            configure_cmd += self._format_options(self.cross_configure_options, d)

        # Set common env variables like CFLAGS, CC, etc.
        link_exelist: T.List[str] = []
        link_args: T.List[str] = []
        self.run_env: EnvironOrDict = os.environ.copy()
        for lang, compiler in self.env.coredata.compilers[MachineChoice.HOST].items():
            if any(lang not in i for i in (ENV_VAR_PROG_MAP, CFLAGS_MAPPING)):
                continue
            cargs = self.env.coredata.get_external_args(MachineChoice.HOST, lang)
            assert isinstance(cargs, list), 'for mypy'
            self.run_env[ENV_VAR_PROG_MAP[lang]] = self._quote_and_join(compiler.get_exelist())
            self.run_env[CFLAGS_MAPPING[lang]] = self._quote_and_join(cargs)
            if not link_exelist:
                link_exelist = compiler.get_linker_exelist()
                _l = self.env.coredata.get_external_link_args(MachineChoice.HOST, lang)
                assert isinstance(_l, list), 'for mypy'
                link_args = _l
        if link_exelist:
            # FIXME: Do not pass linker because Meson uses CC as linker wrapper,
            # but autotools often expects the real linker (e.h. GNU ld).
            # self.run_env['LD'] = self._quote_and_join(link_exelist)
            pass
        self.run_env['LDFLAGS'] = self._quote_and_join(link_args)

        self.run_env = self.user_env.get_env(self.run_env)
        self.run_env = PkgConfigInterface.setup_env(self.run_env, self.env, MachineChoice.HOST,
                                                    uninstalled=True)

        self.build_dir.mkdir(parents=True, exist_ok=True)
        self._run('configure', configure_cmd, workdir)

    def _quote_and_join(self, array: T.List[str]) -> str:
        return ' '.join([shlex.quote(i) for i in array])

    def _validate_configure_options(self, variables: T.List[T.Tuple[str, str, str]], state: 'ModuleState') -> None:
        # Ensure the user at least try to pass basic info to the build system,
        # like the prefix, libdir, etc.
        for key, default, val in variables:
            if default is None:
                continue
            key_format = f'@{key}@'
            for option in self.configure_options:
                if key_format in option:
                    break
            else:
                FeatureNew('Default configure_option', '0.57.0').use(self.subproject, state.current_node)
                self.configure_options.append(default)

    def _format_options(self, options: T.List[str], variables: T.List[T.Tuple[str, str, str]]) -> T.List[str]:
        out: T.List[str] = []
        missing = set()
        regex = get_variable_regex('meson')
        confdata: T.Dict[str, T.Tuple[str, T.Optional[str]]] = {k: (v, None) for k, _, v in variables}
        for o in options:
            arg, missing_vars = do_replacement(regex, o, 'meson', confdata)
            missing.update(missing_vars)
            out.append(arg)
        if missing:
            var_list = ", ".join(repr(m) for m in sorted(missing))
            raise EnvironmentException(
                f"Variables {var_list} in configure options are missing.")
        return out

    def _run(self, step: str, command: T.List[str], workdir: Path) -> None:
        mlog.log(f'External project {self.name}:', mlog.bold(step))
        m = 'Running command ' + str(command) + ' in directory ' + str(workdir) + '\n'
        log_filename = Path(mlog.get_log_dir(), f'{self.name}-{step}.log')
        output = None
        if not self.verbose:
            output = open(log_filename, 'w', encoding='utf-8')
            output.write(m + '\n')
            output.flush()
        else:
            mlog.log(m)
        p, *_ = Popen_safe(command, cwd=workdir, env=self.run_env,
                           stderr=subprocess.STDOUT,
                           stdout=output)
        if p.returncode != 0:
            m = f'{step} step returned error code {p.returncode}.'
            if not self.verbose:
                m += '\nSee logs: ' + str(log_filename)
            raise MesonException(m)

    def _create_targets(self, extra_depends: T.List[T.Union['BuildTarget', 'CustomTarget']]) -> T.List['TYPE_var']:
        cmd = self.env.get_build_command()
        cmd += ['--internal', 'externalproject',
                '--name', self.name,
                '--srcdir', self.src_dir.as_posix(),
                '--builddir', self.build_dir.as_posix(),
                '--installdir', self.install_dir.as_posix(),
                '--logdir', mlog.get_log_dir(),
                '--make', join_args(self.make),
                ]
        if self.verbose:
            cmd.append('--verbose')

        self.target = build.CustomTarget(
            self.name,
            self.subdir.as_posix(),
            self.subproject,
            self.env,
            cmd + ['@OUTPUT@', '@DEPFILE@'],
            [],
            [f'{self.name}.stamp'],
            depfile=f'{self.name}.d',
            console=True,
            extra_depends=extra_depends,
            description='Generating external project {}',
        )

        idir = build.InstallDir(self.subdir.as_posix(),
                                Path('dist', self.rel_prefix).as_posix(),
                                install_dir='.',
                                install_dir_name='.',
                                install_mode=None,
                                exclude=None,
                                strip_directory=True,
                                from_source_dir=False,
                                subproject=self.subproject)

        return [self.target, idir]

    @typed_pos_args('external_project.dependency', str)
    @typed_kwargs('external_project.dependency', KwargInfo('subdir', str, default=''))
    def dependency_method(self, state: 'ModuleState', args: T.Tuple[str], kwargs: 'Dependency') -> InternalDependency:
        libname = args[0]

        abs_includedir = Path(self.install_dir, self.rel_prefix, self.includedir)
        if kwargs['subdir']:
            abs_includedir = Path(abs_includedir, kwargs['subdir'])
        abs_libdir = Path(self.install_dir, self.rel_prefix, self.libdir)

        version = self.project_version
        compile_args = [f'-I{abs_includedir}']
        link_args = [f'-L{abs_libdir}', f'-l{libname}']
        sources = self.target
        dep = InternalDependency(version, [], compile_args, link_args, [],
                                 [], [sources], [], [], {}, [], [], [])
        return dep


class ExternalProjectModule(ExtensionModule):

    INFO = ModuleInfo('External build system', '0.56.0', unstable=True)

    def __init__(self, interpreter: 'Interpreter'):
        super().__init__(interpreter)
        self.methods.update({'add_project': self.add_project,
                             })

    @typed_pos_args('external_project_mod.add_project', str)
    @typed_kwargs(
        'external_project.add_project',
        KwargInfo('configure_options', ContainerTypeInfo(list, str), default=[], listify=True),
        KwargInfo('cross_configure_options', ContainerTypeInfo(list, str), default=['--host=@HOST@'], listify=True),
        KwargInfo('verbose', bool, default=False),
        ENV_KW,
        DEPENDS_KW.evolve(since='0.63.0'),
    )
    def add_project(self, state: 'ModuleState', args: T.Tuple[str], kwargs: 'AddProject') -> ModuleReturnValue:
        configure_command = args[0]
        project = ExternalProject(state,
                                  configure_command,
                                  kwargs['configure_options'],
                                  kwargs['cross_configure_options'],
                                  kwargs['env'],
                                  kwargs['verbose'],
                                  kwargs['depends'])
        return ModuleReturnValue(project, project.targets)


def initialize(interp: 'Interpreter') -> ExternalProjectModule:
    return ExternalProjectModule(interp)
