#!/usr/bin/env python3

import logging
import os
import subprocess
import sys
import typing

import coloredlogs
import magic

# TODO Able to ignore extensions everywhere


class ArchiveType:
    suffix: str = ""
    fullname: str = ""
    dest_suffix: str = ""
    mime: typing.Optional[str] = None
    header: typing.Optional[bytes] = None
    extract_cmd: typing.Optional[typing.List[str]] = None
    single_file = False
    append_dest = False

    def __init__(self) -> None:
        self.log = logging.getLogger(self.__class__.__name__)

    def dest_name(self, archive: str) -> str:
        return archive + self.dest_suffix

    def fits(self, name_lower: str, mime: str, header: bytes) -> bool:
        if not name_lower.endswith(self.suffix):
            return False
        if self.mime is not None and mime != self.mime:
            return False
        if self.header is not None and not header.startswith(self.header):
            return False
        return True

    def _get_cmd(self, archive: str, dest: str) -> typing.List[str]:
        assert self.extract_cmd
        cmd = self.extract_cmd + [archive]
        if self.append_dest:
            cmd.append(dest)
        return cmd

    def extract(self, archive: str, dest: str) -> None:
        cmd = self._get_cmd(archive, dest)
        if not self.single_file:
            os.mkdir(dest)
        self.log.info("Extracting '%s' into '%s'", archive, dest)
        self.log.debug("%s", cmd)
        if self.single_file:
            r = subprocess.run(cmd)
        else:
            r = subprocess.run(cmd, cwd=dest)
        r.check_returncode()
        if self.single_file:
            assert os.path.isfile(dest)

    extract_fun: typing.Optional[typing.Callable[[str, str], None]] = None


class ArchiveZip(ArchiveType):
    suffix = ".zip"
    mime = "application/zip"
    extract_cmd = ["unzip"]


class Archive7z(ArchiveType):
    suffix = ".7z"
    mime = "application/x-7z-compressed"
    extract_cmd = ["7z", "x"]


class ArchiveRar(ArchiveType):
    suffix = ".rar"
    mime = "application/x-rar"
    extract_cmd = ["unrar", "x"]


class ArchiveTar(ArchiveType):
    suffix = ".tar"
    mime = "application/x-tar"
    extract_cmd = ["tar", "--extract", "--file"]


class ArchiveTarGz(ArchiveType):
    suffix = ".tar.gz"
    mime = "application/gzip"
    extract_cmd = ["tar", "--extract", "--gzip", "--file"]


class ArchiveTarXz(ArchiveType):
    suffix = ".tar.xz"
    mime = "application/x-xz"
    extract_cmd = ["tar", "--extract", "--xz", "--file"]


class ArchiveGzip(ArchiveType):
    suffix = ".gz"
    mime = "application/gzip"
    single_file = True
    extract_cmd = ["gunzip"]


class TreeExtractor:
    ARCHIVE_TYPES: typing.List[ArchiveType] = [
        ArchiveZip(),
        Archive7z(),
        ArchiveRar(),
        ArchiveTar(),
        ArchiveTarGz(),
        ArchiveTarXz(),
        ArchiveGzip(),
    ]

    def __init__(self) -> None:
        self.log = logging.getLogger("TreeExtractor")
        self.suffixes = set()
        for archive_type in self.ARCHIVE_TYPES:
            self.suffixes.add(archive_type.suffix)

    def extract_tree(self, directory: str = ".") -> None:
        for root, dirs, files in os.walk(directory):
            real_root = os.path.realpath(root)
            for name in files:
                self.log.debug("Handling '%s' '%s'", real_root, name)

                # Initial filtering with suffix
                name_lower = name.lower()
                for suffix in self.suffixes:
                    if name_lower.endswith(suffix):
                        break
                else:
                    self.log.debug("Suffix not matched: %s", name)
                    continue

                filepath = os.path.join(real_root, name)
                with open(filepath, "rb") as filedesc:
                    header = filedesc.read(1024)
                mime = magic.detect_from_content(header).mime_type

                archive_type = None
                for archtyp in self.ARCHIVE_TYPES:
                    if archtyp.fits(name_lower, mime, header):
                        archive_type = archtyp
                        break
                if not archive_type:
                    self.log.debug("Not matched: %s", filepath)
                    continue

                dest_name = archive_type.dest_name(name)
                dest = os.path.join(real_root, dest_name)
                dest_tmp = dest + ".tmp"
                try:
                    archive_type.extract(filepath, dest_tmp)
                except BaseException as e:
                    # TODO Parameters stop on error
                    self.log.error(e, exc_info=True)
                else:
                    os.unlink(filepath)
                    os.rename(dest_tmp, dest)

                if os.path.isdir(dest):
                    self.extract_tree(dest)

    def main(self) -> None:
        directory = sys.argv[1] if len(sys.argv) > 1 else "."
        self.extract_tree(directory)


if __name__ == "__main__":
    coloredlogs.install(level="DEBUG", fmt="%(levelname)s %(message)s")
    TreeExtractor().main()