from pathlib import Path
from typing import Optional, List

from PyTeX.build.git_hook import is_recent, get_latest_commit
from PyTeX import PackageFormatter, ClassFormatter, DictionaryFormatter, DocstripFormatter
from PyTeX.errors import *
from .pytex_msg import pytex_msg
from PyTeX.utils import md5

from .build_information import BuildInfo


class TexFileToFormat:
    def __init__(
            self,
            src_path: Path,
            build_root: Path,
            src_root: Path,
            latex_name: str,
            current_build_info: BuildInfo,
            last_build_info: Optional[List[dict]],
            allow_dirty: bool = False,
            overwrite_existing_files: bool = False,
            build_all: bool = False):
        self.src_path = src_path
        self.build_root = build_root
        self.src_root = src_root
        self.build_path = build_root / src_path.parent.relative_to(src_root)
        self.latex_name = latex_name  # Still an identifier on how to name the package when being formatted
        self.current_build_info = current_build_info
        self.last_build_info_all = last_build_info
        self.last_build_info = self.last_build_info_all[0] if self.last_build_info_all else None
        self.allow_dirty = allow_dirty
        self.overwrite_existing_files: overwrite_existing_files
        self.build_all = build_all
        self._header: Optional[List[str]] = None
        self.__format_header()

        self.dirty = not is_recent(self.src_path, self.current_build_info.package_repo, compare=None)
        self.pytex_dirty: bool = self.current_build_info.pytex_repo.is_dirty(
            working_tree=True,
            untracked_files=True
        )
        if self.last_build_info:
            self.recent: bool = is_recent(
                file=self.src_path,
                repo=self.current_build_info.package_repo,
                compare=self.current_build_info.package_repo.commit(self.last_build_info['source commit hash'])
            )
            self.pytex_recent: bool = get_latest_commit(
                self.current_build_info.pytex_repo
            ).hexsha == self.last_build_info['pytex commit hash']
        else:
            self.recent = False
            self.pytex_recent = False

    def format(self) -> List[dict]:
        if self.dirty or self.pytex_dirty:
            if not self.allow_dirty:
                raise SubmoduleDirtyForbiddenError
            #  TODO: add this to the header...?
            return self.__format()  # Dirty files are always built, since we have no information about them
        elif self.build_all:
            return self.__format()  # Build file since we build all of them
        elif not self.pytex_recent or not self.recent:
            return self.__format()  # Build file since either pytex or package repo is not recent
        elif self.last_build_info and self.last_build_info['dirty']:
            return self.__format()  # Build file since we do not know in what state it is
        else:
            return self.last_build_info_all

    def __format_header(self):
        new_header = []
        if self.current_build_info.header:
            for line in self.current_build_info.header:
                if '.pysty' in self.src_path.name:
                    latex_file_type = 'package'
                elif '.pycls' in self.src_path.name:
                    latex_file_type = 'class'
                elif '.pydict' in self.src_path.name:
                    latex_file_type = 'dictionary'
                elif '.dtx' in self.src_path.name:
                    latex_file_type = 'ERROR'
                else:
                    raise ProgrammingError
                new_header.append(line.format(
                    source_file=self.src_path.name,
                    latex_file_type=latex_file_type
                ))
        self._header = new_header

    def __format(self) -> List[dict]:
        if self.src_path.name.endswith('.pysty'):
            formatter = PackageFormatter(
                package_name=self.src_path.with_suffix('').name,
                author=self.current_build_info.author,
                extra_header=self._header,
                tex_version='LaTeX2e',
                version=self.current_build_info.packages_version,
                latex_name=self.latex_name)
        elif self.src_path.name.endswith('.pycls'):
            formatter = ClassFormatter(
                class_name=self.src_path.with_suffix('').name,
                author=self.current_build_info.author,
                extra_header=self._header,
                tex_version='LaTeX2e',
                version=self.current_build_info.packages_version,
                latex_name=self.latex_name)
        elif self.src_path.name.endswith('.pysty3'):
            formatter = PackageFormatter(
                package_name=self.src_path.with_suffix('').name,
                author=self.current_build_info.author,
                extra_header=self._header,
                tex_version='LaTeX3',
                version=self.current_build_info.packages_version,
                latex_name=self.latex_name)
        elif self.src_path.name.endswith('.pycls3'):
            formatter = ClassFormatter(
                class_name=self.src_path.with_suffix('').name,
                author=self.current_build_info.author,
                extra_header=self._header,
                tex_version='LaTeX3',
                version=self.current_build_info.packages_version,
                latex_name=self.latex_name)
        elif self.src_path.name.endswith('.pydict'):
            formatter = DictionaryFormatter(
                kind=self.src_path.with_suffix('').name,
                author=self.current_build_info.author,
                header=self._header
            )
        elif self.src_path.name.endswith('.dtx'):
            formatter = DocstripFormatter(name=self.src_path.with_suffix('').name)
        else:
            raise ProgrammingError
        formatter.make_default_macros()
        written_files = formatter.format_file(
            input_path=self.src_path,
            output_dir=self.build_path,
            relative_name=str(self.src_path.relative_to(self.src_root)),
            last_build_info=self.last_build_info_all)
        build_infos = []
        for written_file in written_files:
            info = {
                'name': str(self.src_path.parent.relative_to(self.src_root)) + "/" + written_file,
                'source file': str(self.src_path.relative_to(self.src_root)),
                'build time': self.current_build_info.build_time,
                'source version': self.current_build_info.packages_version,
                'source commit hash': self.current_build_info.packages_hash,
                'pytex version': self.current_build_info.pytex_version,
                'pytex commit hash': self.current_build_info.pytex_hash,
                'md5sum': md5(self.build_root / self.src_path.parent.relative_to(self.src_root) / written_file),
                'dirty': self.dirty
            }
            build_infos.append(info)
            pytex_msg('Written file {}'.format(written_file))
        return build_infos