Trailing stop EA

specifications

I would like to have an EA which lets me decide, for every trade on a specific chart

1) When to activate the trailing stop loss, based on the profit of the trade. For example starting from 200 points (20 pips). It can not be a negative value.

2) The distance of the trailing stoploss, based on a percentage of the profit. if I put 50 and I am in 100 points profit, the SL is 50 points. if the profit goes up to 200, the SL is 100 points. if the profit goes down, no changes. 

3) The step to increase the trailing stoploss, in points. to avoid changing at every tick. for example every 5 points

These should be the parameters

1) PROFIT (an integer value, represents the points on the MT4 platform)
2) PERCENTAGE (an integer value, where 100 is 100%)
3) STEP (an integer value, represents the points on the MT4 platform)

The same settings apply to all the trades based on a specific chart. so I can have different settings for different charts, and in the same chart, all the trades follow the same settings

Example 1 

Chart US500
The following trade has 310 points profit

If I put
1)	Profit = 500
2)	Percentage = 50%
3)	Step = 100

When the trade reaches 500 point in profit (5$) sets a SL at 50% the profit, so it would lock in 2,5$ of profit.
If the trade goes against me, I get 2,5$
If the trade goes with me, and the profit increases, each 100 points (1$ on this contract) the SL increases by 50 points (0,5$)

And so on with every trade on this chart, when each one reaches the minimum 500 points of profit.