import os, sys, shutil
import subprocess
import platform
import distro

from .utils import pj, download_remote, escape_path
from ._global import neutralEnv, option


class NeutralEnv:
    def __init__(self, dummy_run):
        self.working_dir = option("working_dir")
        self.source_dir = pj(self.working_dir, "SOURCE")
        self.archive_dir = pj(self.working_dir, "ARCHIVE")
        self.toolchain_dir = pj(self.working_dir, "TOOLCHAINS")
        self.log_dir = pj(self.working_dir, "LOGS")
        for d in (self.source_dir, self.archive_dir, self.toolchain_dir, self.log_dir):
            os.makedirs(d, exist_ok=True)
        self.detect_platform()
        if dummy_run:
            # If this is for a dummy run, we will not run anything.
            # To check for command (and so, don't enforce their presence)
            return
        self.ninja_command = self._detect_command(
            "ninja", default=[["ninja"], ["ninja-build"]]
        )
        self.meson_command = self._detect_command(
            "meson", default=[["meson.py"], ["meson"]]
        )
        self.mesontest_command = [*self.meson_command, "test"]
        self.patch_command = self._detect_command("patch")
        self.git_command = self._detect_command("git")
        self.make_command = self._detect_command("make")
        self.cmake_command = self._detect_command("cmake")
        self.qmake_command = self._detect_command("qmake", required=False)

    def detect_platform(self):
        _platform = platform.system()
        self.distname = _platform
        if _platform == "Windows":
            print(
                "ERROR: kiwix-build is not intented to run on Windows platform.\n"
                "It should probably not work, but well, you still can have a try.",
                file=sys.stderr,
            )
            cont = input("Do you want to continue ? [y/N]")
            if cont.lower() != "y":
                sys.exit(0)
        if _platform == "Linux":
            self.distname = distro.id()
            if self.distname == "ubuntu":
                self.distname = "debian"

    def download(self, what, where=None):
        where = where or self.archive_dir
        download_remote(what, where)

    def _detect_command(self, name, default=None, options=["--version"], required=True):
        if default is None:
            default = [[name]]
        env_key = "KBUILD_{}_COMMAND".format(name.upper())
        if env_key in os.environ:
            default = [os.environ[env_key].split()] + default
        for command in default:
            try:
                retcode = subprocess.check_call(
                    command + options, stdout=subprocess.DEVNULL
                )
            except (FileNotFoundError, PermissionError, OSError):
                # Doesn't exist in PATH or isn't executable
                continue
            if retcode == 0:
                return command
        else:
            if required:
                sys.exit("ERROR: {} command not found".format(name))
            else:
                print("WARNING: {} command not found".format(name), file=sys.stderr)
                return ["{}_NOT_FOUND".format(name.upper())]


class BuildEnv:
    def __init__(self, configInfo):
        self.configInfo = configInfo
        self.base_build_dir = pj(option("working_dir"), option("build_dir"))
        build_dir = (
            configInfo.arch_name if option("use_target_arch_name") else configInfo.name
        )
        build_dir = f"BUILD_{build_dir}"
        self.build_dir = pj(self.base_build_dir, build_dir)
        self.install_dir = pj(self.build_dir, "INSTALL")
        self.toolchain_dir = pj(self.build_dir, "TOOLCHAINS")
        self.log_dir = pj(self.build_dir, "LOGS")
        for d in (self.build_dir, self.install_dir, self.toolchain_dir, self.log_dir):
            os.makedirs(d, exist_ok=True)

        self.libprefix = option("libprefix") or self._detect_libdir()

    def clean_intermediate_directories(self):
        for subdir in os.listdir(self.build_dir):
            subpath = pj(self.build_dir, subdir)
            if subpath == self.install_dir:
                continue
            if os.path.isdir(subpath):
                shutil.rmtree(subpath)
            else:
                os.remove(subpath)

    def _is_debianlike(self):
        return os.path.isfile("/etc/debian_version")

    def _detect_libdir(self):
        if self.configInfo.libdir is not None:
            return self.configInfo.libdir
        if self._is_debianlike():
            try:
                pc = subprocess.Popen(
                    ["dpkg-architecture", "-qDEB_HOST_MULTIARCH"],
                    stdout=subprocess.PIPE,
                    stderr=subprocess.DEVNULL,
                )
                (stdo, _) = pc.communicate()
                if pc.returncode == 0:
                    archpath = stdo.decode().strip()
                    return "lib/" + archpath
            except Exception:
                pass
        if os.path.isdir("/usr/lib64") and not os.path.islink("/usr/lib64"):
            return "lib64"
        return "lib"

    def get_env(self, *, cross_comp_flags, cross_compilers, cross_path):
        env = self.configInfo.get_env()
        pkgconfig_path = pj(self.install_dir, self.libprefix, "pkgconfig")
        env["PKG_CONFIG_PATH"] = ":".join([env["PKG_CONFIG_PATH"], pkgconfig_path])

        env["PATH"] = ":".join([escape_path(pj(self.install_dir, "bin")), env["PATH"]])

        env["LD_LIBRARY_PATH"] = ":".join(
            [
                env["LD_LIBRARY_PATH"],
                pj(self.install_dir, "lib"),
                pj(self.install_dir, self.libprefix),
            ]
        )

        env["QMAKE_CXXFLAGS"] = " ".join(
            [escape_path("-I" + pj(self.install_dir, "include")), env["QMAKE_CXXFLAGS"]]
        )
        env["CPPFLAGS"] = " ".join(
            [escape_path("-I" + pj(self.install_dir, "include")), env["CPPFLAGS"]]
        )
        env["QMAKE_LFLAGS"] = " ".join(
            [
                escape_path("-L" + pj(self.install_dir, "lib")),
                escape_path("-L" + pj(self.install_dir, self.libprefix)),
                env["QMAKE_LFLAGS"],
            ]
        )
        env["LDFLAGS"] = " ".join(
            [
                escape_path("-L" + pj(self.install_dir, "lib")),
                escape_path("-L" + pj(self.install_dir, self.libprefix)),
                env["LDFLAGS"],
            ]
        )

        if cross_comp_flags:
            self.configInfo.set_comp_flags(env)
        if cross_compilers:
            self.configInfo.set_compiler(env)
        if cross_path:
            env["PATH"] = ":".join(self.configInfo.get_bin_dir() + [env["PATH"]])
        return env

    @property
    def configure_wrapper(self):
        try:
            yield self.configInfo.configure_wrapper
        except AttributeError:
            pass

    @property
    def make_wrapper(self):
        try:
            yield self.configInfo.make_wrapper
        except AttributeError:
            pass