Windows GUI Automation

I need a "bot" that will automate a certain Windows GUI. The bot will have a variety of tasks to be able to complete (a lot actually), but I want it be able to run JSON code (preferably) so that other users can create 'scripts' to do something to the bot. I DO NOT want a software that uses hard mouse clicks (or even background mouse clicks) --- I need you to 'reverse engineer' the packets, or whatever, that the bot sends when an action is done on the GUI and then be able to basically send that same packet to perform that action whenever you want to do it. So for example, if you want to save a Notepad file, manually you would do ctrl+s or go to File > Save - however, they both end up doing the same "action". I want you to sniff out that action request and be able to just directly send it to the program so it does it all in the background without having to worry about screen resolutions, etc, etc. See this project, it's basically exactly what I want: [login to view URL] Finally, I want you to add in the ability to accept "commands" (or "actions") from a PHP server of mine that tells this bot how to run. So if I want to type "hey there" and then save that Notepad file as '[login to view URL]', I would go to my PHP site and fill in a simple HTML form that tells your bot to do those actions. This is where JSON will come in handy once again I believe. You don't need to actually create any of the HTML part of the project, I'm going to hire someone else to make a fancy backend for all this... but they will need to know how to send the data to your bot on the Windows VPS. If you have any questions, feel free to let me know! Otherwise, to prove you read this entire project description, please tell me what language you plan on using to create this project and why you chose that language. Thank you!