#!/usr/bin/env python3
# coding: utf-8
import logging
import math
import os
from contextlib import contextmanager
from typing import Literal
from pymongo import MongoClient
from datetime import datetime

from config import ENABLE_VIP, FREE_DOWNLOAD, MONGO_URI

class PaymentStatus:
    PENDING = "pending"
    COMPLETED = "completed"
    FAILED = "failed"
    REFUNDED = "refunded"

def get_database():
    client = MongoClient(MONGO_URI)
    try:
        # Verify connection
        client.admin.command('ping')
    except Exception as e:
        logging.error("Failed to connect to database: %s", e)
        raise
    
    return client[os.getenv("DB_NAME", "ytdl_bot")]

db = get_database()

def get_quality_settings(tgid) -> Literal["high", "medium", "low", "audio", "custom"]:
    user = db.users.find_one({"user_id": tgid})
    if user and "settings" in user:
        return user["settings"].get("quality", "high")
    return "high"

def get_format_settings(tgid) -> Literal["video", "audio", "document"]:
    user = db.users.find_one({"user_id": tgid})
    if user and "settings" in user:
        return user["settings"].get("format", "video")
    return "video"

def set_user_settings(tgid: int, key: str, value: str):
    db.users.update_one(
        {"user_id": tgid},
        {"$set": {f"settings.{key}": value}},
        upsert=True
    )

def get_free_quota(uid: int):
    if not ENABLE_VIP:
        return math.inf

    user = db.users.find_one({"user_id": uid})
    if user:
        return user.get("free", FREE_DOWNLOAD)
    return FREE_DOWNLOAD

def get_paid_quota(uid: int):
    if ENABLE_VIP:
        user = db.users.find_one({"user_id": uid})
        if user:
            return user.get("paid", 0)
        return 0
    return math.inf

def reset_free_quota(uid: int):
    db.users.update_one(
        {"user_id": uid},
        {"$set": {"free": 5}}
    )

def add_paid_quota(uid: int, amount: int):
    db.users.update_one(
        {"user_id": uid},
        {"$inc": {"paid": amount}}
    )

def check_quota(uid: int):
    if not ENABLE_VIP:
        return

    user = db.users.find_one({"user_id": uid})
    if user and (user.get("free", 0) + user.get("paid", 0)) <= 0:
        raise Exception("Quota exhausted. Please /buy or wait until free quota is reset")

def use_quota(uid: int):
    if not ENABLE_VIP:
        return

    user = db.users.find_one({"user_id": uid})
    if user:
        if user.get("free", 0) > 0:
            db.users.update_one(
                {"user_id": uid},
                {"$inc": {"free": -1}}
            )
        elif user.get("paid", 0) > 0:
            db.users.update_one(
                {"user_id": uid},
                {"$inc": {"paid": -1}}
            )
        else:
            raise Exception("Quota exhausted. Please /buy or wait until free quota is reset")

def init_user(uid: int):
    db.users.update_one(
        {"user_id": uid},
        {"$setOnInsert": {
            "user_id": uid,
            "free": FREE_DOWNLOAD,
            "paid": 0,
            "created_at": datetime.utcnow()
        }},
        upsert=True
    )

def reset_free():
    db.users.update_many(
        {},
        {"$set": {"free": FREE_DOWNLOAD}}
    )

def credit_account(who, total_amount: int, quota: int, transaction, method="stripe"):
    user = db.users.find_one_and_update(
        {"user_id": who},
        {"$inc": {"paid": quota}},
        return_document=True
    )
    
    if user:
        dollar = total_amount / 100
        logging.info("user %d credited with %d tokens, payment:$%.2f", who, user["paid"], dollar)
        
        payment = {
            "method": method,
            "amount": total_amount,
            "status": PaymentStatus.COMPLETED,
            "transaction_id": transaction,
            "user_id": who,
            "created_at": datetime.utcnow()
        }
        db.payments.insert_one(payment)
        
        return user.get("free", 0), user.get("paid", 0)
    
    return None, None