package net.ess3.api;

import net.ess3.utils.FormatUtil;


/**
 * Instead of using this api directly, we recommend to use Vault
 */
public final class Economy
{
	private Economy()
	{
	}
	private static IEssentials ess;
	private static final String noCallBeforeLoad = "Essentials API is called before Essentials is loaded.";

	/**
	 * Returns the balance of a user
	 *
	 * @param name Name of the user
	 * @return balance
	 * @throws UserDoesNotExistException
	 */
	public static double getMoney(String name) throws UserDoesNotExistException
	{
		if (ess == null)
		{
			throw new RuntimeException(noCallBeforeLoad);
		}
		return ess.getEconomy().getMoney(name);
	}

	/**
	 * Sets the balance of a user
	 *
	 * @param name Name of the user
	 * @param balance The balance you want to set
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 * @throws NoLoanPermittedException If the user is not allowed to have a negative balance
	 */
	public static void setMoney(String name, double balance) throws UserDoesNotExistException, NoLoanPermittedException
	{
		if (ess == null)
		{
			throw new RuntimeException(noCallBeforeLoad);
		}
		ess.getEconomy().setMoney(name, balance);
	}

	/**
	 * Adds money to the balance of a user
	 *
	 * @param name Name of the user
	 * @param amount The money you want to add
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 * @throws NoLoanPermittedException If the user is not allowed to have a negative balance
	 */
	public static void add(String name, double amount) throws UserDoesNotExistException, NoLoanPermittedException
	{
		double result = getMoney(name) + amount;
		setMoney(name, result);
	}

	/**
	 * Subtracts money from the balance of a user
	 *
	 * @param name Name of the user
	 * @param amount The money you want to subtract
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 * @throws NoLoanPermittedException If the user is not allowed to have a negative balance
	 */
	public static void subtract(String name, double amount) throws UserDoesNotExistException, NoLoanPermittedException
	{
		double result = getMoney(name) - amount;
		setMoney(name, result);
	}

	/**
	 * Divides the balance of a user by a value
	 *
	 * @param name Name of the user
	 * @param value The balance is divided by this value
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 * @throws NoLoanPermittedException If the user is not allowed to have a negative balance
	 */
	public static void divide(String name, double value) throws UserDoesNotExistException, NoLoanPermittedException
	{
		double result = getMoney(name) / value;
		setMoney(name, result);
	}

	/**
	 * Multiplies the balance of a user by a value
	 *
	 * @param name Name of the user
	 * @param value The balance is multiplied by this value
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 * @throws NoLoanPermittedException If the user is not allowed to have a negative balance
	 */
	public static void multiply(String name, double value) throws UserDoesNotExistException, NoLoanPermittedException
	{
		double result = getMoney(name) * value;
		setMoney(name, result);
	}

	/**
	 * Resets the balance of a user to the starting balance
	 *
	 * @param name Name of the user
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 * @throws NoLoanPermittedException If the user is not allowed to have a negative balance
	 */
	public static void resetBalance(String name) throws UserDoesNotExistException, NoLoanPermittedException
	{
		if (ess == null)
		{
			throw new RuntimeException(noCallBeforeLoad);
		}
		ess.getEconomy().resetBalance(name);
	}

	/**
	 * @param name Name of the user
	 * @param amount The amount of money the user should have
	 * @return true, if the user has more or an equal amount of money
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 */
	public static boolean hasEnough(String name, double amount) throws UserDoesNotExistException
	{
		return amount <= getMoney(name);
	}

	/**
	 * @param name Name of the user
	 * @param amount The amount of money the user should have
	 * @return true, if the user has more money
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 */
	public static boolean hasMore(String name, double amount) throws UserDoesNotExistException
	{
		return amount < getMoney(name);
	}

	/**
	 * @param name Name of the user
	 * @param amount The amount of money the user should not have
	 * @return true, if the user has less money
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 */
	public static boolean hasLess(String name, double amount) throws UserDoesNotExistException
	{
		return amount > getMoney(name);
	}

	/**
	 * Test if the user has a negative balance
	 *
	 * @param name Name of the user
	 * @return true, if the user has a negative balance
	 * @throws UserDoesNotExistException If a user by that name does not exists
	 */
	public static boolean isNegative(String name) throws UserDoesNotExistException
	{
		return getMoney(name) < 0.0;
	}

	/**
	 * Formats the amount of money like all other Essentials functions. Example: $100000 or $12345.67
	 *
	 * @param amount The amount of money
	 * @return Formatted money
	 */
	public static String format(double amount)
	{
		if (ess == null)
		{
			throw new RuntimeException(noCallBeforeLoad);
		}
		return FormatUtil.displayCurrency(amount, ess);
	}

	/**
	 * Test if a player exists to avoid the UserDoesNotExistException
	 *
	 * @param name Name of the user
	 * @return true, if the user exists
	 */
	public static boolean playerExists(String name)
	{
		if (ess == null)
		{
			throw new RuntimeException(noCallBeforeLoad);
		}
		return ess.getEconomy().playerExists(name);
	}

	/**
	 * Test if a player is a npc
	 *
	 * @param name Name of the player
	 * @return true, if it's a npc
	 * @throws UserDoesNotExistException
	 */
	public static boolean isNPC(String name) throws UserDoesNotExistException
	{
		if (ess == null)
		{
			throw new RuntimeException(noCallBeforeLoad);
		}
		return ess.getEconomy().isNPC(name);
	}

	/**
	 * Creates dummy files for a npc, if there is no player yet with that name.
	 *
	 * @param name Name of the player
	 * @return true, if a new npc was created
	 */
	public static boolean createNPC(String name)
	{
		if (ess == null)
		{
			throw new RuntimeException(noCallBeforeLoad);
		}
		return ess.getEconomy().createNPC(name);
	}

	/**
	 * Deletes a user, if it is marked as npc.
	 *
	 * @param name Name of the player
	 * @throws UserDoesNotExistException
	 */
	public static void removeNPC(String name) throws UserDoesNotExistException
	{
		if (ess == null)
		{
			throw new RuntimeException(noCallBeforeLoad);
		}
		ess.getEconomy().removeNPC(name);
	}
}