Amazing-Python-Scripts

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(function(){
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	window.ScoreModel = function(options){
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		var self = this;
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		self._points = 0;
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		self._multiplier = 1;
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		self._maxMultiplier = 20;
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		self._enemyChain = self._threshold = 10;
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		self._totalEnemies = 0;
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		self._difficultyLevel = 0;
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		self._difficultyChain = 0;
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		self.increaseDifficulty = options.increaseDifficulty;
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		self._powerupLevel = 0;
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		self._powerupChain = 0;
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		self.increasePowerup = options.increasePowerup;
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		self._previousHighScore = 0;
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		self._killChain = 0;
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		// Stats
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		self._bulletsFired = 0;
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		self._enemiesKilled = 0;
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		self._enemiesEscaped = 0;
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		self._longestKillChain = 0;
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		// Load highscore from local storage
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		var storedData = localStorage.getItem('gunship');
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		if(storedData){
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			self._previousHighScore = (JSON.parse(storedData)).score;
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		}
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		// Save the current score to storage if it's higher than the
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		// previous high score
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		self.save = function(){
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			if(self.score() > self._previousHighScore){
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				localStorage.setItem('gunship', JSON.stringify({
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					date: (new Date()).getTime(),
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					score: self.score()
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				}));
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			}
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		}
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		// Get the multiplier
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		self.multiplier = function(){
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			return self._multiplier;
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		}
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		// Get the score
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		self.score = function(){
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			return self._points;
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		}
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		self.highScore = function(){
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			return self._previousHighScore;
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		}
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		self.longestKillChain = function(){
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			return self._longestKillChain;
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		}
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		// Reset the miltiplier
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		self.resetMultiplier = function(){
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			self._multiplier = 1;
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			self._enemyChain = self._threshold;
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			self._powerupChain = 0;
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			self._killChain = 0;
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		}
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		// Add points to the model
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		// Increase the multiplier when 100 points have been added
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		self.add = function(points){
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			self._points += (points * self._multiplier);
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			// Maintain the killchain values
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			self._longestKillChain = Math.max(self._longestKillChain, ++self._killChain);
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			if(self._multiplier < self._maxMultiplier && --self._enemyChain == 0){
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				++self._multiplier;
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				self._enemyChain = self._threshold;
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			}
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			// Increment the total enemies
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			++self._totalEnemies;
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			// When the total enemies killed gets past a
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			// threshold then callback to make enemies more
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			// difficult
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			if(++self._difficultyChain == 10){
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				self._difficultyChain = 0;
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				++self._difficultyLevel;
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				if(self.increaseDifficulty)
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					self.increaseDifficulty(self._difficultyLevel);
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			}
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			// If the user gets a kill streak of 20 then
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			// callback to award an upgrade. Powerup chain is
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			// reset each time an enemy escapes but already awarded
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			// powerups stay.
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			if(++self._powerupChain == 20){
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				self._powerupChain = 0;
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				++self._powerupLevel;
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				if(self.increasePowerup)
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					self.increasePowerup(self._powerupLevel);
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			}
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		}
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	}
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})();