from uuid import uuid4
from core.transaction import Transaction


class Tracker:
    def __init__(self, data_manager) -> None:
        self.data_manager = data_manager
        self.users = {}
        self.items = {}
        self.transactions = []
        self.debts = {}

        self._load_all_data()

    def _load_all_data(self):
        self.users = self.data_manager.load_users()
        self.items = self.data_manager.load_items()
        self.debts = self.data_manager.load_debts()
        self.transactions = self.data_manager.load_transactions()

    def add_purchase(self, user_id, item_id):
        if user_id not in self.users:
            return {"status": "error", "message": "User not found"}

        if item_id not in self.items:
            return {"status": "error", "message": "Item not found"}

        item = self.items[item_id]

        if user_id not in self.debts:
            self.debts[user_id] = 0.0
        self.debts[user_id] += item.price

        transaction = Transaction(str(uuid4()), user_id, item_id, item.price)
        self.transactions.append(transaction)

        self.data_manager.save_debts(self.debts)
        self.data_manager.save_transactions(self.transactions)

        return {
            "status": "success",
            "message": f"Added {item.name} to {self.users[user_id].name}'s debt",
            "new_debt": self.debts[user_id],
        }

    def get_user_debt(self, user_id):
        return self.debts.get(user_id, 0.0)

    def get_all_debts(self):
        return {
            user_id: {
                "name": self.users[user_id].name,
                "debt": self.debts.get(user_id, 0.0),
            }
            for user_id in self.users
        }

    def adjust_debt(self, user_id, amount, admin_password):
        if not self._verify_admin(admin_password):
            return {"status": "error", "message": "Invalid password"}

        if user_id not in self.users:
            return {"status": "error", "message": "User not found"}

        if user_id not in self.debts:
            self.debts[user_id] = 0.0
        self.debts[user_id] -= amount
        self.data_manager.save_debts(self.debts)

        from uuid import uuid4
        from core.transaction import Transaction

        transaction = Transaction(str(uuid4()), user_id, "adjustment", -amount)
        self.transactions.append(transaction)
        self.data_manager.save_transactions(self.transactions)

        return {
            "status": "success",
            "message": f"Reduced debt by {amount}",
            "new_debt": self.debts[user_id],
        }

    def _verify_admin(self, pwd):
        from config import ADMIN_PASSWORD

        return pwd == ADMIN_PASSWORD

    def get_user_by_id(self, user_id):
        return self.users.get(user_id)

    def get_all_users(self):
        return self.users

    def get_items(self):
        return self.items

    def set_user_pin(self, user_id, pin):
        if user_id not in self.users:
            return {"status": "error", "message": "User not found"}
        self.users[user_id].pin = pin
        self.data_manager.save_users(self.users)
        return {"status": "success", "message": "PIN updated successfully"}

    def add_user(self, user_id, name):
        from core.user import User
        if user_id in self.users:
            return {"status": "error", "message": "User ID already exists"}
        self.users[user_id] = User(user_id, name, "4242")
        self.data_manager.save_users(self.users)
        return {"status": "success", "message": f"User {name} created successfully"}

    def remove_user(self, user_id):
        if user_id not in self.users:
            return {"status": "error", "message": "User not found"}
        name = self.users[user_id].name
        del self.users[user_id]
        if user_id in self.debts:
            del self.debts[user_id]
        self.data_manager.save_users(self.users)
        self.data_manager.save_debts(self.debts)
        return {"status": "success", "message": f"User {name} removed successfully"}

    def edit_user(self, user_id, name, pin=None):
        if user_id not in self.users:
            return {"status": "error", "message": "User not found"}
        self.users[user_id].name = name
        if pin is not None:
            self.users[user_id].pin = pin
        self.data_manager.save_users(self.users)
        return {"status": "success", "message": f"User {name} updated successfully"}

    def add_item(self, item_id, name, price):
        from core.item import Item
        if item_id in self.items:
            return {"status": "error", "message": "Item ID already exists"}
        try:
            price_val = float(price)
        except ValueError:
            return {"status": "error", "message": "Invalid price value"}
        self.items[item_id] = Item(item_id, name, price_val)
        self.data_manager.save_items(self.items)
        return {"status": "success", "message": f"Item {name} created successfully"}

    def remove_item(self, item_id):
        if item_id not in self.items:
            return {"status": "error", "message": "Item not found"}
        name = self.items[item_id].name
        del self.items[item_id]
        self.data_manager.save_items(self.items)
        return {"status": "success", "message": f"Item {name} removed successfully"}

    def edit_item(self, item_id, name, price):
        if item_id not in self.items:
            return {"status": "error", "message": "Item not found"}
        try:
            price_val = float(price)
        except ValueError:
            return {"status": "error", "message": "Invalid price value"}
        self.items[item_id].name = name
        self.items[item_id].price = price_val
        self.data_manager.save_items(self.items)
        return {"status": "success", "message": f"Item {name} updated successfully"}