#!/usr/bin/python3
import re
import subprocess
import warnings
from pathlib import Path
from window_subprocess import open_pdf, edit
from enum import Enum


class FileType(Enum):
    pdf = 'pdf'
    tex = 'tex'


class FileHandle:
    def __init__(self, file_path: Path, file_type: FileType = FileType.pdf):
        self.path = file_path
        self.file_type = file_type
        match = re.match(r'[\D]*(\d+)[\D]*\.' + file_type.value, file_path.name)
        if match is None:
            warnings.warn(f'Invalid format in file {str(file_path)}: Could not parse number.')
            self.number = -1
        else:
            self.number = int(match.group(1))
    
    def open(self):
        if self.file_type == FileType.pdf:
            open_pdf(self.path)
            return 0
        elif self.file_type == FileType.tex:
            edit(self.path)
            return 0
        return 1

    def edit(self):
        if self.file_type == FileType.tex:
            edit(self.path)
            return 0
        else:
            return 1


class Files(list):
    def __init__(self, root_path: Path, pattern: str = "*"):
        self.root: Path = root_path
        list.__init__(self, self.read_files(pattern))

    def read_files(self, pattern):
        files = self.root.glob(pattern)
        return sorted((FileHandle(f) for f in files), key=lambda f: f.number)

    def unite_files(self, name):
        result = subprocess.run(
            ['pdfunite'] + list(map(lambda f: str(f.path), self)) + [str(self.root / name)]
        )
        print(result.stdout)