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Okay.

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In this lecture, let's go ahead and give our players the ability to purchase guns and other items from

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our shop.

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This means we'll have to listen for when the proximity prompt inside of our shop is triggered, and

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then display a shop GUI on the player's screen.

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Then the player can press a button to purchase an item, fire to the server that they want to buy something,

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and then the server can check if the player has enough money, and then give them the tool and deduct

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the money out of their leaderboard.

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So the GUI we're going to be displaying on the player's screen is inside of replicated storage in the

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shared folder.

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And then in the GUI folder.

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It's our shop GUI, and I'll parent it into the starter GUI so we can go ahead and take a look at it.

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Let me enable UI visibility.

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This is our simple shop GUI, and it's simply just a scrolling frame that has different frames inside

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of it for the different items we can purchase.

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And each of these items has a button inside of it with a name for the item they would like to purchase.

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So if they hit this button, then we're going to tell a server we would like to purchase a grenade.

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Or for example, if they hit this button, we'll tell the server we want to purchase the pistol and

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so on.

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So the server's job is going to listen for when the player clicks these buttons.

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And then we're going to check to see if the player has enough money.

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And if they do we can give them the item.

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So let me go ahead and move this back inside of the GUI folder.

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And then let me disable UI visibility.

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And let's go ahead and create a new script inside of server script service.

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And this can be the script responsible for handling our shop.

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So we'll call it the shop handler.

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We'll be using the same comet template as before.

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And what we want to do is we want to enable this proximity prompt that is in our shop only when the

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game is set, either in the starting intermission or the intermission between waves.

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So when a wave starts or the game is currently in cleanup mode, we want to basically close down the

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shop.

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We want to hide this guy up here and disable the proximity prompt so players can't purchase stuff while

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a wave is going on.

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So what we can go ahead and do is we can listen for when the workspace has an attribute changed.

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And that attribute we're going to get attribute change signal.

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And that is going to be the game state attribute.

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And then we can connect a function to this event.

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And then we can go ahead and get the current game state which is equal to workspace get attribute game

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state.

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And then we can check to see what the current game state is, and if it's in the intermission or start

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intermission, we'll enable the shop.

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Otherwise we'll disable the shop.

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So let's go ahead and get the game state enum and Replicated Storage.

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So we'll grab replicated storage.

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And then we can go ahead and get our game state enum and we'll require from replicated storage dot modules,

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dot enums dot game state enum.

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So if the workspace is current, game state is equal to the game state enum of intermission, or the

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game state is equal to the game state enum of start intermission, then we're okay to go ahead and enable

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that proximity prompt and the billboard guy over our shop.

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So let's go ahead and make a variable for those things.

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We first want to refer to our shop.

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And that's in the workspace in the map folder.

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And it's simply called our I believe Weapon shop.

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There we go.

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We can go ahead and grab the prompt inside of our weapon shop, which is inside of our shop.

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We're going to get the proximity part and then get the prompt that's inside of there.

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And then we can also grab the billboard guy.

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We'll just call it guy and that's equal to shop and we'll grab our billboard guy.

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So in the game state is in the intermission.

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Then we're going to make sure that our prompt is enabled.

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So we'll set that equal to true.

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And we'll also make sure our guy is enabled.

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Otherwise if the game state is not in the intermission, then we'll make sure that our prompt is disabled

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and that our guy is also disabled.

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Then from this point, we could go ahead and listen to when our prompt is triggered by a player.

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So we'll connect a function and get that player.

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And what we want to go ahead and do is we want to clone the guy that is in replicated storage and give

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it to our player.

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So the first thing we need to do is just in case.

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For some reason, the game state is not in the intermission game state.

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We can check inside of here as well.

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So I'm going to copy this and paste this here.

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So if the game state is not equal to the regular intermission and the game state is not equal to the

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start intermission, then we don't want to give them a GUI.

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So we're just going to return.

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Otherwise we got to check if the player already has this guy displayed on their screen.

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So if this player and in their player GUI folder we find first child which is the shop GUI, then that

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means we shouldn't give the player a new guy so we could either return, or another thing we could do

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is we could refer to that player's GUI and then just destroy it so it's not on their screen anymore.

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So shop GUI destroy.

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And then we could return, or we could just actually give and display them a new one.

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But in this case, we're just going to create a new clone of our shop guy.

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So let's go ahead and make a variable for that.

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We'll call it our shop guy.

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And that's in replicated storage dot shared dot GIS dot shop guy.

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And then we can go ahead and clone our shop guy and then set the parent of that clone equal to our players

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player guy folder.

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So it displays on their screen.

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And then this is where we would have a local script inside of that shop guy.

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And then once we parent it to the players player guy folder, that local script will execute on the

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client side, allowing the player to interact with the buttons in the GUI.

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So actually let's go ahead and go into replicated storage and let's create a new local script inside

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of our shop GUI.

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And this can be our shop GUI handler.

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We'll use the same common template.

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And inside of here we can go ahead and make a variable to refer to the GUI itself, which is script

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dot parent.

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And then we want to go ahead and refer to the frame holding all of the stuff in the GUI.

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So that's equal to g dot background frame.

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And then we want to go ahead and also grab the close button of our shop.

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So if the player presses the close button we'll remove it from the player.

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So that'll be equal to frame dot close button.

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And then we'll also get the frame that's holding all of the different items in our shop.

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So that's the shop frame and that's going to be frame dot shop frame.

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Now in order to communicate to the server when we want to buy something, we have an event inside of

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the remotes folder inside of GUI, which is our buy item event, so we can go ahead and grab replicated

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storage.

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And then we'll make a reference to that event.

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We'll just call it our BI event that's equal to replicated storage, dot remotes, dot gui dot buy item.

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Then what we can go ahead and do is to make this really simple.

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Instead of having to refer to every single button that is inside of our shop frame, we can instead

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loop through all of the descendants of our shop frame, check to see if it's one of these frames, and

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then grab the button in there, and then listen for when that button is clicked and fire to the server

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the name of this button so the server knows which item the player wants to purchase.

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So we could create a dedicated function to listen for when a particular button is clicked.

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We'll call it on button clicked, and we'll get passed to this function.

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The name of the item they want to purchase, which should be the name of the button.

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And then we could use our buy event and fire to the server.

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Hey, we want to buy this particular item, so then we can loop through all of the buttons inside of

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our shop frame get.

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Descendants.

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And what we want to do is we want to make sure that this element that we're looping through is actually

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a button.

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So if this particular element is not a button, so is a text button.

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If it is not a text button, then we're just going to continue to the next iteration of this loop.

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Otherwise we can go ahead and listen for when this button is activated.

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And then we'll connect a function.

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And this is where we would go ahead and call our on button clicked, and then pass the name of our button.

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And then the other thing we want to go ahead and listen to is when our close button is activated.

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And then we can connect a function and simply just disable the GUI.

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And since we're doing it this way, that means the GUI is still going to be inside of our player GUI

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folder.

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And that means the next time a player goes and they trigger the proximity prompt to reopen it on their

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screen, the server is simply going to delete their previous one and give them a new one.

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And I believe that's all we need to do for our shop guy.

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So back inside of our shop handler, we need to go ahead and listen to that by event and check to see

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if the player has enough money to purchase a particular item.

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So let's go ahead and make a variable for our by event.

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And that's in replicated storage dot remotes dot guy dot buy item.

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And then we can go ahead and listen to when our by event is fired.

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So on server event will connect a function.

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We'll get the player and then the name of the item they wish to purchase.

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And then what we could go out and do is create a table containing the names of all of the different

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items that are possible to purchase.

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So I'll call this my tools table.

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And inside of here we'll have a key which represents the name of a particular item.

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And then we could set the price and then the tool for that particular item.

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So for example if one of the buttons the player presses is the pistol button, then the client is going

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to send to the server the name of pistol.

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So we'll make that one of the keys in our table.

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So pistol.

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And we'll set that equal to a table.

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And inside of here we can define the price of that particular item as well as the tool associated with

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this name.

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So for the pistol inside of our GUI we set that to the price of $60.

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And then the associated tool with that is stored in server storage.

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So let's go ahead and make a reference to server storage game git service server storage.

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And the tool is in server storage tools.

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And we'll get the pistol.

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Another item that the player can purchase is the SMG.

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And the button is called SMG.

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And we'll set that equal to another table.

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The price for that is set at 100.

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And then the associated tool is equal to the server storage dot tools dot SMG.

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And then we can just continue doing this for every single purchasable item in our game.

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For example they can purchase a rifle and the rifle costs 200.

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And then we'll refer to our rifle, which I believe it's called assault rifle.

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There we go.

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Another item we can purchase is a regular shotgun.

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The price we set for that one is also set at 200.

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And that's going to be equal to our shotgun.

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And we'll do the buckshot shotgun.

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The next item they can purchase would be the shotgun.

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And the button is called shotgun slugs.

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And we set the price of that one equal to 250.

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And that's going to be our shotgun of slugs.

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The next one would be the semi-auto shotgun I believe that's how we named it.

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So if we go ahead and take a look at the button for that one.

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Yep.

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It says semi-auto shotgun.

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So we'll make sure that this key matches the name of the button.

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And then we'll refer to that inside of our tools folder that is the semi-auto shotgun.

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And then players could also purchase other things such as a mic kit.

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So we'll call this one med kit.

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The price of a med kit we set to $30 and the tool is our med kit.

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And then last but not least, in the future we're going to be scripting our grenade.

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But just for demonstration sake, we're going to also add our grenade into our table.

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Forgot a comma there.

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And we put that there.

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And the price for our grenade is equal to $40.

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And the tool is going to be in service storage dot tools dot grenade.

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So now what we can go ahead and do is when this event is fired, we first want to make sure that the

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game is in a state where the player can purchase an item because an exploiter could fire this event

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while the players are in the middle of a wave.

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And we don't want to give that player an item unless the game is in the intermission state.

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So we're basically just going to copy this here and paste that there.

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So if it's not in intermission, we're going to return.

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Otherwise we also need to verify that the name of the item they passed here is actually a possible item

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to purchase within our tools table.

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So if we do not find this particular tool or this name of the item in our tools table, then we're also

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just going to return.

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Another thing we need to check is if the player has enough money to purchase this particular tool.

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So we're going to calculate what the after balance would be for our player.

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When we subtract the price of this tool to the current amount of money the player has.

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So that's going to be equal to player.

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Get their leaderstats folder, get the money, and then get the value of that and subtract it by this

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particular tools.

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And then we'll pass the name of the item and we'll get the price of that tool.

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And then we can check if this after balance is less than zero.

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So they would have a negative balance.

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And that clearly means the player did not have enough money to purchase this item.

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So we're also going to return.

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Another thing we need to check for is if this player already has this tool in their inventory, because

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we don't want players to purchase a duplicate guns, the only things that we would allow them to purchase

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as duplicates would be the one use Medkits.

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So if inside of our player's backpack we find first child.

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And then we need to get the name of the tool.

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So that's going to be in tools.

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We'll pass the name of item, get that tool and then get the name of the tool.

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If we find this tool in their backpack, or let's say we find it on their player's character.

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So or player dot character find first child this.

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And then we also need to make sure that the name of this item is in our med kit, because we want our

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player to be able to purchase multiple med kits.

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So then we'll put an end statement here.

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So.

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And let's check to see if the tools pass.

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Name of item.

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Get the tool and get the name.

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If it's not equal to med kit, then we're going to return.

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So let me go ahead and get rid of that duplicate then statement.

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So.

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This looks a little bit more concise.

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Let me shift this down.

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So if the player has this tool in their backpack or they have it equipped on their character, and the

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name of this tool is not equal to our med kit, then we're going to ignore this player because we do

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not want to give them duplicate tools.

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Otherwise we can go ahead and update the value inside of the player's leader stats dot money int value

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and set that value equal to our after balance.

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And then we can go ahead and make a clone of the tool that they want to purchase.

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So we'll clone that.

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And then we can go ahead and set the parent of that clone equal to the player's backpack.

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So now we should have scripted everything we need to allow players to purchase items from our shop.

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So let's go ahead and make sure inside of our game handler script that we're setting the game state

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to an intermission.

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So we're setting it to the start intermission, which means we should be able to display all of the

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items in our shop.

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And actually, what we should do down here in this main section is we should check the game state of

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the workspace.

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So we'll get the game state if the game state is equal to.

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The intermission or it's equal to the start intermission.

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Then we'll make sure to enable the prompt and the GUI for the shop.

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So we'll paste that right there.

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So now we should be able to purchase items from our shop.

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Let's go ahead and playtest and find out.

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Go and play our game here.

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And then we can go ahead and play our game and spawn into the map.

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And let's go over and see if that prompt is enabled.

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So as you can see it says open shop.

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If I trigger the prompt, as you can see, the server cloned that guy into my player guy folder and

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now it's displayed on my screen.

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And since I don't have enough money to purchase anything, if I click these buttons, nothing should

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happen.

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So if I click.

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As we expect nothing would happen because we don't have any money.

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Now, if I go to the server and I give my player some money, so let me go ahead and give me a bunch

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of money.

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Do something like that.

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Go back to the client.

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Now I have $1 million.

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Let's see if I can actually purchase something like a pistol.

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So if I click this.

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There we go.

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I got the pistol added to my inventory, and then it deducted that amount of money from my money int

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value.

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I can also purchase a rifle.

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00:17:49,950 --> 00:17:51,840
Actually, it's not letting me purchase a rifle.

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Very interesting.

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How about an SMG?

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I can purchase an SMG.

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I can purchase a shotgun, a semi-auto shotgun.

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I can purchase slugs, but it does look like I am not able to purchase a rifle, which could mean that

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we got the name messed up a little bit.

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So let's go ahead and confirm that the name of our button matches the server.

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So the name of our button is rifle.

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00:18:15,210 --> 00:18:20,220
And then if we go back to our shop handler let's make sure that actually matches.

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So yes, it's also spelt out as a rifle.

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Right here we have the price set and then we should be referring to the assault rifle.

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00:18:31,460 --> 00:18:33,410
And it should be allowing us to purchase it.

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00:18:33,410 --> 00:18:36,380
I wonder why it didn't let us purchase the assault rifle.

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00:18:37,050 --> 00:18:40,410
That's why I already had the assault rifle inside of my starter pack.

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So let me actually go ahead and delete it.

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And then playtest my game.

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00:18:44,570 --> 00:18:47,870
I guess I didn't notice that I already had my assault rifle on me.

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00:18:48,620 --> 00:18:50,330
So let's go ahead and try that again.

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If I open my shop.

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As you can see, I can't purchase anything.

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But if I give my player some money.

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I'll just get my player a whole bunch of money and we'll go back.

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And then if I were to purchase the rifle.

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There we go.

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I get the rifle, I get the pistol.

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00:19:07,020 --> 00:19:11,160
And then if I try to buy this item again, as you can see, it's not giving me anything because I already

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have a rifle in my inventory, but I can buy all the other stuff as well as the grenade and the med

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00:19:15,900 --> 00:19:16,320
kit.

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00:19:16,320 --> 00:19:19,380
And then we shouldn't be limited on how many med kits we can purchase.

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00:19:19,380 --> 00:19:20,730
So if I keep clicking this.

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As you can see, the server is continuing to give me med kits because we've set no limit on how many

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med kits a player can buy.

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Okay, we've got our shop all set up.

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You're doing a great job so far with this project.

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Keep up the good work and I'll see you in the next lecture.