import os
import time
import sys
from datetime import datetime

version = "0.5.3" # actully 0.5.2 because 0.5.1 was just pushed
gitlab_url = "https://gitlab.com/python_projects3802849/ftl-save-manager/-/raw/main"
settings_location = "settings.txt"
dependencies = ("simple_term_menu", "requests")

if sys.platform != "linux":
    print(f"{sys.platform} is not supported, only linux.")
    exit()

def check_package_installed(package_name):
    """Check if a package is installed."""
    try:
        __import__(package_name)
        return True
    except ImportError as e:
        print(f"{package_name} not found. Error: {e}")
        return False

for item in dependencies:
    if check_package_installed(item) == False:
        print(f"One or more dependencies are missing, please ensure follwing packaged are installed:\nrequests\nsimple-term-menu")
        exit()

import requests
from simple_term_menu import TerminalMenu

class BackupApp:
    """"Backup class, copy FTL continue file to backup location and restores it."""
    def __init__(self):
        self.backup_files = {"1": "initiating"} # initiating variable
        self.game_path = configuration.settings["GAME_PATH"]
        self.save_path = configuration.settings["SAVE_PATH"]

    def backup(self):
        """Copies the game file to the backup folder and adds date-time stamp."""
        now = datetime.now()
        formatted_now = now.strftime("%Y-%m-%d_%H-%M-%S")
        u.copy_file(f"{self.game_path}/continue.sav", f"{self.save_path}/{formatted_now}.bkup")
        time.sleep(0.5)

    def restore_backup(self, file):
        u.copy_file(f"{self.save_path}/{file}", f"{self.game_path}/continue.sav")

    def delete_backup_file(self): # improvment: here also, more generic, delete_files with file type .something
        """Deltes all .bkup files in the backup folder."""
        if u.yes_no("Are you sure you want to delete all save files?"):
            for file in os.listdir(self.save_path):
                if file[-5:] == ".bkup":
                    try:
                        print(f"Deleting {file}.")
                        os.remove(f"{self.save_path}/{file}")
                        time.sleep(0.3)
                    except Exception as e:
                        print(f"Failed to delete {file}. Reason: {e}.")
                        time.sleep(1)
        else:
            print("Deleting save files canceled")
            time.sleep(0.5)

class Updater:
    """Update local version from gitlab repo."""
    def __init__(self, version, local_file):
        self.current_version = version
        self.update_url = configuration.settings["REPO_URL"]
        self.local_file = local_file
        self.git = os.path.exists(".gitignore") # Checking if the program inside git env
        self.auto_check()

    def auto_check(self):
        print("Auto update check")
        check_interval = configuration.settings["AUTO_UPDATE_CHECK_INTERVAL_H"]
        if check_interval == 0:
            print("Auto update disabeld")
            return # Exiting
        if "LAST_UPDATE_CHECK" in configuration.settings:
            last_time = configuration.settings["LAST_UPDATE_CHECK"]
            t_object = datetime.strptime(last_time, "%Y-%m-%d %H-%M")
            try:
                h_since_update_check = u.get_difference_in_hours(datetime.now(), t_object)
                if h_since_update_check > int(configuration.settings["AUTO_UPDATE_CHECK_INTERVAL_H"]):
                    print(f"More then {configuration.settings["AUTO_UPDATE_CHECK_INTERVAL_H"]} hours since last update check, checking now...")
                    self.check_for_update(0)
            except ValueError:
                print("Invalid timestamp format for LAST_UPDATE_CHECK.")
                input("Error checking for updates:\nEnter to continue...")
        else:
            self.check_for_update(0)

    def check_for_update(self, verbose = 1):
            """Check if a new version is available."""
            try:
                if verbose: print("Checking for updates...")
                response = requests.get(f"{self.update_url}/latest_version.txt")
                response.raise_for_status()
                self.update_info = self.read_version_file(response)
                configuration.settings["LAST_ONLINE_VERSION"] = self.update_info["LATEST_VERSION"] # updating the version number from update class to global var
                now = datetime.now()
                formatted_now = now.strftime("%Y-%m-%d %H-%M")
                configuration.settings["LAST_UPDATE_CHECK"] = formatted_now
                if self.compare_str_SemVer(self.current_version, self.update_info["LATEST_VERSION"]):
                    if verbose:
                        print(f"New version {self.update_info["LATEST_VERSION"]} available online.\nCurrent version: {self.current_version}")
                        print(f"\nUpdate comment:\n{self.update_info["COMMENT"]}\n")
                    return True
                else:
                    if verbose:
                        print(f"You are up-to-date ({self.current_version}).\nLatest version is: {self.update_info["LATEST_VERSION"]}.")
                        input("Enter to continue...")
                    return False
            except Exception as e:
                if verbose: print(f"Error checking for updates: {e}")
                input("UPDATE ERROR Press Enter to continue...")
                return False

    def read_version_file(self, response): # does basicly the same as the read settings function in settingmanger class, optimizing would combine them.
        settings = {}
        lines = response.text.splitlines()
        for line in lines:
            if line.startswith("#") or "=" not in line:
                continue
            key, value = map(str.strip, line.split("=", 1))
            if value.startswith('"') and value.endswith('"'):
                settings[key] = value[1:-1]
        return settings

    def compare_str_SemVer(self, first, second):
        """Compare two Semantic versioning strings."""
        local_version = self.convert_str_list_to_int(first.split("."))
        online_version = self.convert_str_list_to_int(second.split("."))
        return local_version < online_version

    def convert_str_list_to_int(self, list_str):
        """Converts a list with strings to a list with intengers."""
        return [int(i) for i in list_str]

    def download_update(self): # improvment: silly it takes the latest_version as variable
        """Download the new version and overwrite the current file."""
        try:
            print(f"Downloading version {self.update_info["LATEST_VERSION"]}...")
            time.sleep(2)
            response = requests.get(f"{self.update_url}/{self.local_file}")
            response.raise_for_status()
            with open(self.local_file, "wb") as file:
                file.write(response.content)
            print("Update downloaded.")
            return True
        except Exception as e:
            print(f"Error downloading update: {e}")
            return False

    def restart_program(self):
        """Restart the current program."""
        print("Restarting the program...")
        os.execv(sys.executable, ["python"] + sys.argv)

    def run_update(self):
        """Main method to check, update, and restart."""
        if self.git:
            print("Updating only works outside git env.")
            time.sleep(2)
        else:
            if self.check_for_update():
                if u.yes_no("Do you want to update the program?"):
                    success = self.download_update()
                    if success:
                        self.restart_program()
                else:
                    print("Update cancelled")
                    return

class TerminalUI:
    def __init__(self, title, options):
        self.main_menu_title = title
        self.main_menu_options = options
        self.main_menu_keys = list(self.main_menu_options.keys()) # terminal ui takes a list for the menu
        self.main_menu = TerminalMenu(
            menu_entries = self.main_menu_keys,
            title = self.main_menu_title,
            menu_cursor = "> ",
            menu_cursor_style = ("fg_gray", "bold"),
            menu_highlight_style = ("bg_gray", "fg_black"),
            cycle_cursor = True,
            clear_screen = True
        )

    def show_main_menu(self):
        # Adding try makes it possiable to add code after the True loop
        try:
            while True:
                selected_index = self.main_menu.show()
                selected_key = None
                if isinstance(selected_index, int):
                    selected_key = self.main_menu_keys[selected_index]
                if selected_index == None:
                    break
                elif selected_key == "[l] Load":
                    self.restore_file_menu(app.save_path)
                elif selected_key == "[c] Change settings":
                    self.change_settings_menu()
                elif selected_key == "[p] Profile managment":
                    self.profile_menu()
                elif selected_key in self.main_menu_options:
                    self.main_menu_options[selected_key]()
        finally:
            configuration.write_settings_file() # writing settings when exiting.

    def restore_file_menu(self, folder):
        menu_options = list(self.list_files(folder))
        folder_menu = TerminalMenu(menu_entries = menu_options,
                                    title = f"Content of {folder} (Q or Esc to go back).\n",
                                    menu_cursor = "> ",
                                    menu_cursor_style = ("fg_red", "bold"),
                                    menu_highlight_style = ("bg_gray", "fg_black"),
                                    cycle_cursor = True,
                                    clear_screen = False,
                                    )

        menu_entry_index = folder_menu.show()
        if menu_entry_index == None:
            return
        else:
            app.restore_backup(menu_options[menu_entry_index])

    def list_files(self, directory):
        return (file for file in sorted(os.listdir(directory), reverse = True) if os.path.isfile(os.path.join(directory, file)) and file.endswith((".bkup")))

    def yes_no_menu(self, message): # oh
        menu_options = ["[y] yes", "[n] no"]
        menu = TerminalMenu(menu_entries = menu_options,
                                    title = f"{message}",
                                    menu_cursor = "> ",
                                    menu_cursor_style = ("fg_red", "bold"),
                                    menu_highlight_style = ("bg_gray", "fg_black"),
                                    cycle_cursor = True,
                                    clear_screen = False)
        menu_entry_index = menu.show()
        if menu_entry_index == 0:
            return True
        elif menu_entry_index == 1:
            return False

    def change_settings_menu(self):
        menu_options = [f"[g] Game path ({configuration.settings["GAME_PATH"]})",
                        f"[s] Save path ({configuration.settings["SAVE_PATH"]})",
                        f"[a] Auto update interval ({configuration.settings["AUTO_UPDATE_CHECK_INTERVAL_H"]})",
                        "[q] Quite"]
        settings_option = ["GAME_PATH", "SAVE_PATH", "AUTO_UPDATE_CHECK_INTERVAL_H"]
        settings_menu = TerminalMenu(menu_entries = menu_options,
                                    title = "Change settings (Q or Esc to go back).\n",
                                    menu_cursor = "> ",
                                    menu_cursor_style = ("fg_red", "bold"),
                                    menu_highlight_style = ("bg_gray", "fg_black"),
                                    cycle_cursor = True,
                                    clear_screen = False
                                    )
        try:
            while True:
                selected_index = settings_menu.show()
                selected_key = None
                if selected_index == 3:
                    break
                if isinstance(selected_index, int):
                    selected_key = settings_option[selected_index]
                if selected_index == None:
                    break
                elif selected_key in settings_option:
                    if self.yes_no_menu(f"Do you want to change {selected_key} from {configuration.settings[selected_key]}?"):
                        new_value = input(f"Please enter new value for {selected_key}: ")
                        configuration.settings[selected_key] = new_value
                        configuration.validate_paths_in_settings()
                        configuration.convert_str_to_int_settings()
                    else:
                        print("No changed were made.")
        finally:
            configuration.write_settings_file() # writing settings when exiting.

    def profile_menu(self):
        menu_options = ["[b] Backup profile", "[r] Restore profile", "[q] Quite"]
        menu = TerminalMenu(menu_entries = menu_options,
                                    title = f"Backup or restore the profile file, which includes complete progress (Q or Esc to go back).\n",
                                    menu_cursor = "> ",
                                    menu_cursor_style = ("fg_red", "bold"),
                                    menu_highlight_style = ("bg_gray", "fg_black"),
                                    cycle_cursor = True,
                                    clear_screen = False)
        menu_entry_index = menu.show()
        profile_path = f"{configuration.settings["GAME_PATH"]}/ae_prof.sav"
        backup_path = f"{configuration.settings["SAVE_PATH"]}/ae_prof.sav"

        if menu_entry_index == 0:
            u.copy_file_overwrite_if_newer(profile_path, backup_path)
        elif menu_entry_index == 1:
            u.copy_file_overwrite_if_newer(backup_path, profile_path)
        else:
            return

class SettingManager:
    """Handles program settings, reading, validating, and writing them."""
    # Refactored this class with suggestions from ChatGPT for better readability (code and language) and efficiency
    def __init__(self, settings_path, repo_url):
        self.accepted_settings_keys = ["GAME_PATH", "SAVE_PATH", "LAST_ONLINE_VERSION", "REPO_URL", "LAST_UPDATE_CHECK", "AUTO_UPDATE_CHECK_INTERVAL_H"]
        self.settings_file_path = settings_path
        self.settings = self.read_settings_file()
        # Initialize settings
        if self.settings:
            self.validate_paths_in_settings()
            self.set_default_values(repo_url)
        else:
            self.initialize_settings(repo_url)
        self.convert_str_to_int_settings()

    def set_default_values(self, repo_url):
        default_values = {"REPO_URL": repo_url,
                            "AUTO_UPDATE_CHECK_INTERVAL_H": "72"
                            }
        for key in default_values:
            if key not in self.settings:
                self.settings[key] = default_values[key]
                print(f"Setting default value: {default_values[key]} for: {key}.")
                #time.sleep(0.5)

    def convert_str_to_int_settings(self):
        """Change str to int for a given keys in the settings, if not convertable then replace with default value"""
        int_values = {"AUTO_UPDATE_CHECK_INTERVAL_H": 72} # Dict for all variables which sould be intinger, and their default values. Scable for future
        for key in int_values:
            try:
                self.settings[key] = int(self.settings[key])
            except ValueError:
                print(f"Value: {self.settings[key]} could not be changed to an int.")
                self.settings[key] = int_values[key]
                print(f"Changing {key} to default value value: {int_values[key]}\nAcknowledged...")
                time.sleep(1)

    def initialize_settings(self, repo_url): # URL in settings file has higher priority, is good for feature branches.
        """Initialize settings when the file doesn't exist or is empty."""
        print("Initializing settings...")
        self.set_default_values(repo_url)
        self.get_paths()
        self.write_settings_file()

    def validate_paths_in_settings(self):
        """Validate and set paths from the settings file."""
        required_paths = ["GAME_PATH", "SAVE_PATH"]
        if all(self.settings.get(path) for path in required_paths):
            valid_game_path = u.check_path_existence(self.settings["GAME_PATH"], "ae_prof.sav")
            valid_save_path = u.check_path_existence(self.settings["SAVE_PATH"])
            if valid_game_path and valid_save_path:
                print("Paths validated successfully.")
                return
        print("Invalid paths detected. Requesting user input.")
        self.get_paths()
        self.write_settings_file()

    def read_settings_file(self):
        """Read settings from the file."""
        settings = {}
        if os.path.exists(self.settings_file_path):
            try:
                with open(self.settings_file_path, "r") as file:
                    for line in file:
                        if line.startswith("#") or "=" not in line:
                            continue
                        key, value = map(str.strip, line.split("=", 1))
                        if value.startswith('"') and value.endswith('"'):
                            settings[key] = value[1:-1]
                return settings
            except Exception as e:
                print(f"Error reading settings file: {e}")
        print("Settings file does not exist or is invalid.")
        return settings

    def write_settings_file(self):
        """Write the settings dictionary to the file."""
        print("Writing settings")
        try:
            with open(self.settings_file_path, "w") as file:
                file.write("# This file is rewritten before program closes. Comments are ignored.\n# Setting AUTO_UPDATE_CHECK_INTERVAL_H = '0' disables automatic update checks.\n# DO NOT modify REPO_URL if you don't know what value to set, no function to fix incorrect input.\n")
                for key in self.accepted_settings_keys:
                    if key in self.settings:
                        value = self.settings[key]
                        file.write(f'{key} = "{value}"\n')
        except Exception as e:
            input(f"Error writing settings file: {e}\nEnter to continue")

    def get_paths(self):
        """Request and validate paths from the user."""
        self.settings["GAME_PATH"] = self.ask_for_path("Game path", "ae_prof.sav")
        self.settings["SAVE_PATH"] = self.ask_for_path("Save path")

    def ask_for_path(self, description, required_file = None):
        """Prompt the user for a valid path."""
        while True:
            path = input(f"Please enter the {description}: ")
            if u.check_path_existence(path, required_file):
                return path
            print("Invalid path. Please try again.")

class Utility():
    @staticmethod
    def check_path_existence(path, required_file = None):
        """Check if a path exists and optionally if it contains a specific file."""
        if required_file:
            full_path = os.path.join(path, required_file)
            return os.path.isfile(full_path)
        return os.path.isdir(path)

    @staticmethod
    def get_difference_in_hours(dt1, dt2):
        diff = abs(dt1 - dt2)
        hours_difference = int(diff.total_seconds() / 3600)
        return hours_difference

    @staticmethod
    def yes_no(str): # improvment: have two yes_no function, should merge them
        """Ask user y/n question"""
        while True:
            choice = input(f"{str} (y/n): ")
            if choice == "y":
                return True
            elif choice == "n":
                return False
            else:
                print(f"Not a valid option, try again.")

    @staticmethod
    def copy_file(src, dst):
        """"Simply copies a file from a to b."""
        if not os.path.isfile(src):
            print(f"File to copy {src} does not exist.")
            return False
        os.system(f"cp {src} {dst}")
        print(f"Wrote: {dst}")

    @staticmethod
    def copy_file_overwrite_if_newer(source, destination):
        # Main part arrived from opencoder ollama, modified to fit my needs
        # check if source file exists
        if not os.path.exists(source):
            print(f"Source file {source} does not exist.")
            return False

        # get modification times of source and destination files
        src_mtime = os.path.getmtime(source)
        dest_mtime = 0
        if os.path.exists(destination):
            dest_mtime = os.path.getmtime(destination)

        if src_mtime < dest_mtime:
            print(f"Destination file is newer than the source.\n({destination} vs {source})")
            # ask user permission to overwrite
            if u.yes_no("Do you want to replace?"):
                os.system(f"cp {source} {destination}")
                print(f"File {source} has been copied to {destination}")
            else:
                print(f"User chose not to replace {destination}.")
        else:
            print(f"Source file is older than or equal to the destination.\n ({source} vs {destination})")
            os.system(f"cp {source} {destination}")
            print(f"File {source} has been copied to {destination}")
        time.sleep(1)
        return True

u = Utility()
configuration = SettingManager(settings_location, gitlab_url)
up = Updater(version, "ftl-savemanager.py")
app = BackupApp()

update_key = "[u] Update"
if "LAST_ONLINE_VERSION" in configuration.settings:
    if up.compare_str_SemVer(version, configuration.settings["LAST_ONLINE_VERSION"]):
        update_key += f" (v{configuration.settings["LAST_ONLINE_VERSION"]})"

main_menu_options = {
    "[s] Save": app.backup,
    "[l] Load": "restore_file_menu",
    "[d] Delete save files": app.delete_backup_file,
    f"{update_key}": up.run_update,
    "[p] Profile managment": "backup and restore profile",
    "[c] Change settings": "change:_settings_menu",
    "[q] Quit": exit
}

title = f"ftl-savemanager v{version} (Press Q or Esc to quit).\n"
tui = TerminalUI(title, main_menu_options)

tui.show_main_menu()