from datetime import datetime, timedelta, timezone
from db_utils import get_player, insert_player, delete_player, insert_pull, get_last_rolled_at, get_random_character
from add_character import add_character
from config import GACHA_ROLL_INTERVAL

def do_roll(full_user):
    '''Determines whether the user can roll, then pulls a random character'''
    user_id = get_player(full_user)

    if not user_id:
        return f'@{full_user} 🛑 You haven’t signed up yet! Use the `signup` command to start playing.'
    # Get date of user's last roll
    date = get_last_rolled_at(user_id)

    # No date means it's users first roll
    if date:
        # SQLite timestamps returned by the DB are always in UTC
        # Below timestamps are to be converted to UTC
        prev = datetime.strptime(date + '+0000', '%Y-%m-%d %H:%M:%S%z')
        now = datetime.now(timezone.utc)

        time_since_last_roll = now - prev
        roll_interval = timedelta(seconds=GACHA_ROLL_INTERVAL)
        duration = roll_interval - time_since_last_roll

        # User needs to wait before they can roll again
        if time_since_last_roll < roll_interval:
            remaining_duration = None
            if duration.seconds > 3600:
                remaining_duration = f'{-(duration.seconds // -3600)} hours'
            elif duration.seconds > 60:
                remaining_duration = f'{-(duration.seconds // -60)} minutes'
            else:
                remaining_duration = f'{duration.seconds} seconds'

            return f'{full_user} ⏱️ Please wait another {remaining_duration} before rolling again.'

    character_id, character_name, file_id, rarity = get_random_character()

    if not character_id:
        return f'{full_user} Uwaaa... something went wrong! No characters found. 😿'

    insert_pull(user_id,character_id)
    stars = '⭐️' * rarity
    return([f"@{full_user} 🎲 Congrats! You rolled {stars} **{character_name}**\n\
            She's all yours now~ 💖✨",[file_id]])

def do_signup(full_user):
    '''Registers a new user if they haven’t signed up yet.'''
    user_id = get_player(full_user)

    if user_id:
        return f'@{full_user} 👀 You’re already signed up! Let the rolling begin~ 🎲'

    new_user_id = insert_player(full_user)
    return f'@{full_user} ✅ Signed up successfully! Your gacha destiny begins now... ✨ Use the roll command to start!'

def is_float(val):
    '''Returns true if `val` can be converted to a float'''
    try:
        float(val)
        return True
    except ValueError:
        return False

def do_create(full_user, arguments, note_obj):
    '''Creates a character'''
    # Example call from bot logic
    image_url = note_obj.get('files', [{}])[0].get('url') if note_obj.get('files') else None
    if not image_url:
        return f'{full_user}{full_user} You need an image to create a character, dumbass.'

    if len(arguments) != 3:
        return '{full_user}Please specify the following attributes in order: \
                name, rarity, drop weighting'

    if not (arguments[1].isnumeric() and 1 <= int(arguments[1]) <= 5):
        return f'{full_user}Invalid rarity: \'{arguments[1]}\' must be a number between 1 and 5'

    if not (is_float(arguments[2]) and 0.0 < float(arguments[2]) <= 1.0):
        return f'{full_user}Invalid drop weight: \'{arguments[2]}\' \
                must be a decimal value between 0.0 and 1.0'

    character_id, file_id = add_character(
        name=arguments[0],
        rarity=int(arguments[1]),
        weight=float(arguments[2]),
        image_url=image_url
    )
    return([f'{full_user}Added {arguments[0]}, ID {character_id}.',[file_id]])

def do_help(full_user):
    '''Provides a list of commands that the bot can do.'''
    return f'{full_user} Here\'s what I can do:\n \
            - `roll` Pulls a random character.\
            - `create <name> <rarity> <weight>` Creates a character using a given image.\
            - `signup` Registers your account.\
            - `delete_account` Deletes your account.\
            - `help` Shows this message'
            
def delete_account(full_user):
    return (
        f'@{full_user} ⚠️ This will permanently delete your account and all your cards.\n'
        'If you’re sure, reply with `confirm_delete` to proceed.\n\n'
        '**There is no undo.** Your gacha luck will be lost to the void... 💀✨'
    )

def confirm_delete(full_user):
    success = delete_player(full_user)

    if not success:
        return f'@{full_user} ❌ No account found to delete. Maybe it’s already gone?'

    return f'@{full_user} 🧼 Your account and all your cards have been deleted. RIP your gacha history 🕊️✨'


def generate_response(parsed_command):
    '''Given a command with arguments, processes the game state and
    returns a response'''

    command, full_user, arguments, note_obj = parsed_command
    match command:
        case 'roll':
            return do_roll(full_user)
        case 'create':
            return do_create(full_user, arguments, note_obj)
        case 'help':
            return do_help(command)
        case 'signup':
            return do_signup(full_user)
        case 'delete_account':
            return delete_account(full_user)
        case 'confirm_delete':
            return confirm_delete(full_user)
        case _:
            return None