"""install.py:

copy files from to_system into system directories
"""

import os
import filecmp
import shutil
from os.path import join, getmtime, exists

os.chdir('to_system')

DEL = '__to_delete__'

def walk(action):
    for dirpath, _, files in os.walk('.'):
        syspath = dirpath[1:]  # remove leading '.'
        action.dirpath = dirpath
        action.syspath = syspath
        if files:
            match, mismatch, missing = filecmp.cmpfiles(dirpath, syspath, files)
            if mismatch:
                newer = [f for f in mismatch if getmtime(join(syspath, f)) > getmtime(join(dirpath, f))]
                if newer:
                    action.newer(newer)
                if len(newer) < len(mismatch):
                    newer = set(newer)
                    action.older([f for f in mismatch if f not in newer])
            if missing:
                if DEL in missing:
                    missing.remove(DEL)
                    with open(join(dirpath, DEL)) as fil:
                        to_delete = []
                        for f in fil:
                            f = f.strip()
                            if f and exists(join(syspath, f)):
                                if exists(join(dirpath, f)):
                                    print('ERROR: %s in %s, but also in repo -> ignored' % (f, DEL))
                                else:
                                    to_delete.append(f)
                        action.delete(to_delete)
                if missing:
                    action.missing(missing)

class Show:
    def show(self, title, files):
        print('%s %s:\n  %s' % (title, self.syspath, ' '.join(files)))
        
    def newer(self, files):
        self.show('get from', files)
        
    def older(self, files):
        self.show('replace in', files)
        
    def missing(self, files):
        self.show('install in', files)
        
    def delete(self, files):
        self.show('remove from', files)

class Do:
    def newer(self, files):
        for file in files:
            shutil.copy(join(self.syspath, file), join(self.dirpath, file))
        
    def older(self, files):
        for file in files:
            shutil.copy(join(self.dirpath, file), join(self.syspath, file))
        
    def missing(self, files):
        self.older(files)
        
    def delete(self, files):
        for file in files:
            os.remove(join(self.syspath, file))

walk(Show())
answer = input('do above?')
if answer.lower().startswith('y'):
    walk(Do())