import os
import time

from pathlib import Path
from prompt_file import *

def get_command_result(input, prompt_file):
    """
    Checks if the input is a command and if so, executes it
    Currently supported commands:
    - start multi-turn
    - stop multi-turn
    - default context
    - show context <n>
    - view context
    - save context
    - clear context
    - load context <filename>
    - set engine <engine>
    - set temperature <temperature>
    - set max_tokens <max_tokens>
    - set shell <shell>

    Returns: command result or "" if no command matched
    """
    if prompt_file == None:
        return "", None
    
    config = prompt_file.config
    # configuration setting commands
    if input.__contains__("set"):
        # set temperature <temperature>
        if input.__contains__("temperature"):
            input = input.split()
            if len(input) == 4:
                config['temperature'] = float(input[3])
                prompt_file.set_config(config)
                print("# Temperature set to " + str(config['temperature']))
                return "config set", prompt_file
            else:
                return "", prompt_file
        # set max_tokens <max_tokens>
        elif input.__contains__("max_tokens"):
            input = input.split()
            if len(input) == 4:
                config['max_tokens'] = int(input[3])
                prompt_file.set_config(config)
                print("# Max tokens set to " + str(config['max_tokens']))
                return "config set", prompt_file
            else:
                return "", prompt_file
        elif input.__contains__("shell"):
            input = input.split()
            if len(input) == 4:
                config['shell'] = input[3]
                prompt_file.set_config(config)
                print("# Shell set to " + str(config['shell']))
                return "config set", prompt_file
            else:
                return "", prompt_file
        elif input.__contains__("engine"):
            input = input.split()
            if len(input) == 4:
                config['engine'] = input[3]
                prompt_file.set_config(config)
                print("# Engine set to " + str(config['engine']))
                return "config set", prompt_file
            else:
                return "", prompt_file

    if input.__contains__("show config"):
        prompt_file.show_config()
        return "config shown", prompt_file

    # multi turn/single turn commands
    if input.__contains__("multi-turn"):
        # start context
        if input.__contains__("start"):
            if config['multi_turn'] == 'off':
                prompt_file.start_multi_turn()
                return "multi turn mode on", prompt_file
            
            return "multi turn mode on", prompt_file
        
        # stop context
        if input.__contains__("stop"):
            prompt_file.stop_multi_turn()
            return "multi turn mode off", prompt_file
    
    # context file commands
    if input.__contains__("context"):
        if input.__contains__("default"):
            prompt_file.default_context()
            return "stopped context", prompt_file
        
        # show context <n>
        if input.__contains__("show"):
            print('\n')
            with open(prompt_file.file_name, 'r') as f:
                lines = f.readlines()
                lines = lines[6:] # skip headers
            
            line_numbers = 0
            if len(input.split()) > 3:
                line_numbers = int(input.split()[3])
            
            if line_numbers != 0:
                for line in lines[-line_numbers:]:
                    print('\n# '+line, end='')
            else:
                print('\n# '.join(lines))
            return "context shown", prompt_file
        
        # edit context
        if input.__contains__("view"):
            # open the prompt file in text editor
            if config['shell'] != 'powershell':
                os.system('open {}'.format(prompt_file.file_path))
            else:
                os.system('start {}'.format(prompt_file.file_path))
            return "context shown", prompt_file

        # save context <filename>
        if input.__contains__("save"):
            # save the current prompt file to a new file
            # if filename not specified use the current time (to avoid name conflicts)

            filename = time.strftime("%Y-%m-%d_%H-%M-%S") + ".txt"
            if len(input.split()) == 4:
                filename = input.split()[3]
            
            prompt_file.save_to(filename)
            return "context saved", prompt_file
        
        # clear context
        if input.__contains__("clear"):
            # temporary saving deleted prompt file
            prompt_file.default_context()
            return "unlearned interaction", prompt_file
        
        # load context <filename>
        if input.__contains_