package ErrorHandling
import NoWurst
import public Printing
import public Real
import public Integer
import public String
import public MagicFunctions
import GameTimer
import Hashtable
import Annotations

@configurable public var MUTE_ERROR_DURATION = 60

constant PRIMARY_ERROR_KEY = -1
constant HT = compiletime(InitHashtable())

/**
	Stores the last error thrown by error().
	This error can be inspected when using try() from package Execute.
**/
public var lastError = ""

/**
	Allows you to suppress error output.
	This is primarily useful when you catch
	an error with try().
**/
public var suppressErrorMessages = false

/** error handing function.
This function is used by libraries and for internal Wurst errors like
accessing a null-pointer. Overwrite this function to customize error handling.

Outputs an error message and terminates the current thread.
There is a compiler flag to augment the error messages with stack traces.
Error messages can also be disabled.

Errors are only displayed once every MUTE_ERROR_DURATION seconds.
To achieve this, the hash of the string is saved in a hashtable together with a timestamp.

You can also use try() from package Execute to handle an error happening in a callback.
*/
@configurable public function error(string msg)
	if compiletime
		compileError("ERROR: " + msg)
	else
		if not suppressErrorMessages
			let hash = msg.getHash()
			if HT.hasInt(PRIMARY_ERROR_KEY, hash)
				// Error has been printed before
				if HT.loadInt(PRIMARY_ERROR_KEY, hash) + MUTE_ERROR_DURATION < currentTime
					// Time to print the error again
					Log.error(msg + getStackTraceString())
					HT.saveInt(PRIMARY_ERROR_KEY, hash, currentTime.toInt())
					HT.saveBoolean(PRIMARY_ERROR_KEY, hash, false)
				else if HT.hasBoolean(PRIMARY_ERROR_KEY, hash)
					if not HT.loadBoolean(PRIMARY_ERROR_KEY, hash)
						Log.error("|cffFF3A29Excessive repeating errors are being omitted")
						HT.saveBoolean(PRIMARY_ERROR_KEY, hash, true)
				else
					Log.error("|cffFF3A29Excessive repeating errors are being omitted")
					HT.saveBoolean(PRIMARY_ERROR_KEY, hash, true)
			else
				HT.saveInt(PRIMARY_ERROR_KEY, hash, currentTime.toInt())
				Log.error("Message: " + msg + getStackTraceString())
		// crash the thread:
		lastError = msg
		I2S(1 div 0)