#!/usr/bin/env python3
"""
project: Backuppy
version: 0.10
file: install.py
summary: python installer-script in CLI-mode
"""

# Standard library imports
import sys
import os

# local imports
from utils import set_language, query, query_path, _print, trace, paths_are_identical

# local globals
VERSION: str = "0.10"
EMAIL = "fotocoder@joschu.ch"
EXCLUDE_FILE = "exclude.txt"
BACKUPPY_SCRIPT = "Backuppy.sh"

def main_install_cli(mydir, exclude_file):
    language = query("welcome")
    if not language:
        return False, None, None
    set_language(language)

    _print("languagepack")

    _print("intromsg1")

    _print("intromsg2")

    # which Rsync options are available and which one you want to use
    _print("rsyncopt", wait=2)

    # asks if you want to exclude files/directories from backup and creates an exclude file in case of Yes
    exclude = query("excludefile1")
    if not exclude:
        return False, None, None
    elif exclude.upper() in ("J", "Y"):
        _print("excludefile2")
        exclude = True
    else:
        _print("excludefile3")
        exclude = False

    # Asks for the source directory which should be saved
    _print("srcdir1")
    sourcedir = query_path("srcdir2")
    if not sourcedir:
        return False, None, None

    #_print("srcdir3_1")
    #print(sourcedir)
    _print("srcdir3_2")

    # asks for the destination directory in which the backup should be saved
    targetdir = query_path("targetdir1")
    while paths_are_identical(sourcedir, targetdir):
        _print("paths_must_differ")
        targetdir = query_path("targetdir1")
    if not targetdir:
        return False, None, None    

    #_print("targetdir2_1")
    #print(targetdir)
    _print("targetdir2_2")

    # collects all the information needed to execute the rsync command and creates it.
    _print("collect", wait=2)

    rsync_cmd = f"rsync -aqp --exclude-from={os.path.join(mydir, exclude_file)} {sourcedir} {targetdir}"

    print(f"{rsync_cmd}")

    # Outro
    _print("outro1", wait=2)

    _print("outro2")
    print(EMAIL)

    return True, exclude, rsync_cmd

def create_exclude_file(mydir, exclude_file):
    exclude_file = os.path.join(mydir, exclude_file)
    with open(exclude_file, "w") as fExclude:
        trace(f"creating exclude-file '{exclude_file}'.")
        fExclude.write("\n")

def create_alias(mydir, backuppy_script):
    shell = os.environ.get("SHELL")
    home_dir = os.environ.get("HOME")
    # alias entry in .bashrc or .zshrc
    backuppy_script = os.path.join(mydir, backuppy_script)
    alias_str = f"alias backuppy='sudo {backuppy_script}'"

    # Check for installed ZSH
    if shell.upper().find("ZSH") > 0:
        rc_filepath = os.path.join(home_dir, ".zshrc")
    # Check for installed BASH
    if shell.upper().find("BASH") > 0:
        rc_filepath = os.path.join(home_dir, ".bashrc")
    # Append our alias if not already existing
    if os.path.isfile(rc_filepath):
        fileRc = open(rc_filepath, "r")  # open file in read mode
        backuppy_entry_exists = False
        for line in fileRc:
            if "alias backuppy=" in line:
                backuppy_entry_exists = True
                break
        if not backuppy_entry_exists:
            trace(f"Writing {alias_str} to config file '{rc_filepath}'.")
            fileRc = open(rc_filepath, "a")  # open file in append mode
            fileRc.write("\n# Following line was created by Backuppy\n" + alias_str + "\n")
        fileRc.close()

def create_backuppy_script(directory, backuppy_script, rsync_cmd):
    # creates the file 'Backuppy.sh'
    backuppy_file = os.path.join(directory, backuppy_script)
    with open(backuppy_file, "w") as fBackuppy:
        trace(f"creating backuppy-file '{backuppy_file}'.")
        fBackuppy.write("#!/bin/bash\n" + rsync_cmd + "\n")
    
    os.chmod(backuppy_file, 0o777)  # make file executable

def do_the_install(mydir: str, exclude_file, is_exclude: bool, backuppy_script: str, rsync_cmd: str):
    """ Creates scripts and entries based on environment variables. """

    if is_exclude:
        create_exclude_file(mydir, exclude_file)

    if rsync_cmd:
        create_backuppy_script(mydir, backuppy_script, rsync_cmd)
        create_alias(mydir, backuppy_script)

def main(argv):
    trace(f"Starting Backuppy install.py v{VERSION}")
    is_finalized = False
    mydir = os.getcwd()

    if argv and argv[0] == "--gui":
        from install_gui import main_install_gui
        trace("Starting GUI-version.")
        is_finalized, is_exclude, rsync_cmd = main_install_gui(mydir, EXCLUDE_FILE)  # collect user input via GUI and store in env. variables

    else:
        trace("Starting CLI-version.\n")
        is_finalized, is_exclude, rsync_cmd = main_install_cli(mydir, EXCLUDE_FILE)  # collect user input via CLI and store in env. variables

    if is_finalized:
        do_the_install(mydir, EXCLUDE_FILE, is_exclude, BACKUPPY_SCRIPT, rsync_cmd)

    trace("Ending Backuppy install.py")

if __name__ == '__main__':
    # sys.argv.append("--gui")  # TODO: disable for production
    sys.exit(main(sys.argv[1:]))