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Welcome back.

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In this lecture we're going to be scripting the service that is going to handle placing batteries around

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the basement that players can collect to increase the charge of their flashlight.

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So let's go ahead and get started.

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I'm first going to show you the different positions that we're going to place them in the basement.

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Inside of our other stuff folder.

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We have a folder in here called Battery Positions.

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And these are just different points that we have inside of our basement that we're going to be spawning

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batteries at.

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So we'll put a model there.

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The players can click that model, and it'll allow them to collect a battery and increase the charge

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on their flashlight.

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So inside of service script service inside of the server folder, we're going to go ahead and open up

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our battery service.

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And inside of here we're going to need some services.

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One is replicated storage.

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Another service we'll need is server storage.

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We will need the sound service.

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And then we're also going to need a server script service.

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Next, we can go ahead and create the table that will represent the service.

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So we'll call it battery service.

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I'll make sure to return that at the end of our script.

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And we're also going to be using the service to act as a class.

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So when we spawn these different battery instances around the map, we're going to use a constructor

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that will create our battery object and we'll connect to that battery givers, click event and give

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that player, you know, batteries when they click it and stuff like that.

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So we'll have a battery service meta table in here and set the battery service meta table dot underscore

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underscore index meta method equal to itself.

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We'll have a reference to the game comms event and replicated storage, dot events, dot remotes, dot

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game communication.

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And then we'll also get the game comms enum.

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So we'll require for replicated storage, dot modules, dot enums, game communication.

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We're also going to get our anti-cheat module script inside of server script service.

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That server modules anti-cheat.

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And now we're going to make a reference to this battery giver, which is inside of server storage.

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So we can call it example battery.

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And it's inside of server stores.

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Other stuff.

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Dot battery.

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So the plan is.

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We're going to take this battery and I'll drag it here into the workspace so we can take a look at it.

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And this battery is going to be randomly placed at these different positions along our map.

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It has a slight glow to it.

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So players are able to see it in the dark.

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If they run out of flashlight batteries.

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And they'll click this part to go ahead and collect the battery.

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And then we'll make this disappear.

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And then after like let's say 50s, we can make it respawn again.

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So that way there isn't a finite number of batteries in the basement.

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This is a very simple model.

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All it has is the battery with a point light inside of it, and then it also has the quick part that

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we're going to use the click detector inside of to listen for when this gets clicked.

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So we can go ahead and move this back into the other stuff folder.

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And we're also going to get all of the different battery positions inside of the basement.

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So server storage, the other stuff.

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Battery positions.

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We're going to get all of the children.

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And then we're also going to refer to a sound in the sound service called the collect sound.

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And we'll play this to a player when they collect a battery.

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So inside of SFX there's a sound called battery collected.

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So when they collect a battery we're going to play this sound right here.

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Perfect.

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And then we can go ahead and create the table to act as cache for storing all of the current battery

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objects.

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So current batteries is equal to a table.

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We're going to need a random data type.

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And then we're going to need some constants.

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So we'll need a constant to define the respawn cooldown, and we'll set that to like 50s.

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We're going to have a constant to represent how much charge we should give to a player when they click

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one of those batteries, so we can call it battery value, and we could do something like 20.

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So if the flashlight's at like 40%, we'll add an extra 20 to make it 60%.

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And then we're also going to define the click distance or how close the player needs to be in order

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to click the giver.

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And we'll make that ten studs.

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Now we're going to need some private functions.

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One function is going to be responsible for changing the battery givers visibility.

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So when it gets clicked we want to make it not visible.

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And then when it regenerates we want to make it visible again.

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So this will get passed a model and then a boolean to tell it whether or not we'd like to make it visible

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or invisible.

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We're going to need a function that we're going to listen for when our different battery givers get

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clicked.

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So we'll call it on clicked.

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We're going to need a function to actually spawn one of those battery givers on the map, and we'll

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get a part passed to this function, which will act as the position we need to set this giver at.

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And then we can finally have a function to actually go ahead and place all of our batteries on the map.

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From this point we can create our constructor.

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So batteries service dot new.

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We'll just get past the battery model or the giver.

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And then we're also going to need a start function for our battery service.

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And this is what we will use to place all of our batteries randomly on the map.

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So what this function is going to do is it's going to loop through every single part or position in

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our battery positions table.

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And we're going to spawn a battery at this position, and we'll have this function return back to us

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the model of that battery giver.

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So we'll get a model back from this.

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And then we can use our constructor battery service.

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Dot new and pass this model to that function.

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So inside of the spawn battery function we're going to create a clone of our example battery giver.

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So example battery clone.

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And again we're going to use the pivot two function to pivot this to a new position.

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And that position is going to be a C frame dot new.

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We'll get the part dot position and subtract this by a vector three dot new zero.

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On the x, we get the part size on the y axis divided by two, and then zero on the z axis.

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And then we're going to add another vector three dot new.

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And this is going to be zero on the x axis.

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And then we're going to get our clone and get the extent size for the y axis.

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And divide that by two and then pass zero for the z axis.

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And then finally we're going to add a C frame angles zero on the x axis.

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And then we're going to have a random rotation.

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So RNG next integer -360 to 360 degrees.

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And then we can go ahead and do zero on the z axis.

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Once we set the c frame to the correct position, we're going to take our clone and set the parent equal

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to the workspace dot krustikrab we can put in the basement and then inside of the batteries folder.

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And then we can go ahead and return this clone or the giver.

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Then we take this clone.

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We pass it to our new constructor.

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So what we're going to do in here is we're going to create a table called self.

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Will make a property to refer to the battery model, which is equal to the battery model passed to the

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function.

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And we'll also make a reference to the click detector which is in the battery model.

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Dot click part.

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Dot click detector.

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And then we can go ahead and listen to when our click detector is clicked.

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And we can connect a lambda function to this and get the player that clicked it.

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And then we can call our on clicked function.

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We can pass the object itself to it, and then we can also pass the player who clicked it.

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Then we can go ahead and set the meta table on our object with the battery service meta table.

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We're going to insert this into our current batteries table, past self and then return self at the

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end of our constructor.

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And now we can go ahead and fill out our onClick function.

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So we'll get self here.

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And then the player who clicked our battery giver.

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And when the player clicks it, we first want to check whether or not they actually have a flashlight

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on them.

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So we can get this flashlight from either the player's backpack, find first child and we can look for

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a flashlight, or if they have it equipped, we can check their character as well.

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So player dot character find first child flashlight.

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If they do not have a flashlight for some reason, then we're just going to return.

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Otherwise, we need to check whether or not the player cheated when trying to grab this battery.

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So let's say they tried to click it from across the map by using like a spoofing technique.

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Then again, we're going to check if this player cheated and get a message from our anti-cheat and check

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player distance to object.

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We're going to pass the player the self dot battery model dot click part.

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And then we can also pass the click distance right there.

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If this player cheated, then we're going to go ahead and kick this player and give them that message

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and then just return.

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Otherwise we can use our set, uh, battery visibility function and pass our model to this and allow

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it to change the visibility or make our model disappear, and then make the model visible again after

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a certain amount of time.

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So we could pass to this function like false.

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And this will change our battery model.

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It'll disable the light and make it transparent.

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So let's go ahead and fill that out here.

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All we're going to do in this function is we're going to refer to the model.

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And inside the model there is the battery part itself.

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And we can set the transparency of it equal to 0 or 1 depending on the boolean.

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So we could do bool and zero.

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So if boolean is true then the transparency gets set to zero.

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Otherwise the transparency gets set to one.

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Again for the model click part dot click detector.

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We're going to get the max activation distance and set this equal to.

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If the bool is true, then we're going to set it equal to the click distance.

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Otherwise we'll set it to zero.

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So that way the players can't click it anymore.

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And then for the model dot battery dot attachment inside of there is our point light.

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We're going to set the enabled equal to the boolean pass to the function.

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And that's all we're going to do for this.

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After we make the battery invisible, what we could do next is get the new battery value that we're

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going to set on the player's flashlight.

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So we're going to use the math dot minimum function because we don't want to go above the flashlights

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Max battery capacity.

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So what we could pass here is we're going to get the flashlight get attribute.

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Current battery.

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And we're going to add.

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Our battery value.

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Now, if this number goes above 100, that's okay, because the other number we're going to pass here

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is the flashlight get attribute max battery.

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So just in case let's say there are batteries at 90.

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And then they click a battery and get plus 20.

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That means this will be 110.

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And we don't want to go above the max battery.

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So the math dot minimum will pick the smallest number, which in this case would be the max battery

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attribute.

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Afterwards, we can refer to the flashlight again and set the attribute on it.

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Of current battery equal to this new battery value.

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Then we can use the game comms event and fire it to this particular player to play a sound.

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So game comms enum dot two client dot play sound.

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And the sound is going to be equal to our collection sound, and then we can set play at point equal

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to false.

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From this point, we're going to use task dot delay to delay a function.

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We're going to pass the respawn cooldown.

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And the function we want to delay is our set battery visibility function.

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And then to this function we have to pass the self dot battery model again.

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And then we also need to pass a boolean.

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In this case that's going to be true.

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So after 50s we're going to make our battery model visible again and make it clickable again.

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That way another player can come along and collect the battery off of it.

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Now there is one small security vulnerability, and that is, even if we set the click distance to zero,

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an exploiter could still spoof this click detector and fire it close by to it and collect the battery,

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even though it's invisible or not ready to be used.

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So a way we could stop that is, we could go back into our constructor and have a another property we

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could call it something like is enabled, and we'll set that to true by default.

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And then inside of the set battery function we can change inside of our object the is enabled property.

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So that means instead to this function we should pass the object itself.

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And we could also pass the model.

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Why not.

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So we'll do set battery visibility.

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We'll pass self.

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We'll pass the model.

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And we'll make sure to do that down here as well.

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And then we can get self inside of this function.

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And set self dot is enabled equal to the boolean.

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And then inside of our onClick function, what we could do is we could check if self dot is enabled

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is not true.

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So if not self dot is enabled, then we're just going to return because the battery is currently in

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its cool down mode.

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Perfect.

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And I think that's all we need to do for our battery service.

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So we can go ahead and test it out.

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And unfortunately it looks like we immediately did get an error.

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So inside of our service we got failed to start.

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Uh, module C frame expected got vector three.

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So let's go ahead and figure out what the problem is on line 69.

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And the problem is, is that we forgot to actually place this vector three inside of the c frame2 because

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as you can see, our C frame dot new function terminates right here.

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And then we're attempting to add a vector three which causes the value to return a vector three.

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So we need to copy this real quick.

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And then we actually need to set this inside of here.

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So we'll put an extra quotation and we'll put another one here.

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So after our vector three function right here we can then paste our other vector three and then indent

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that there.

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And then after we set the c frame we're applying the rotation to it afterwards.

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So now our problem should be fixed.

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Let's go ahead and test this out again.

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Okay, now we are inside of the basement.

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We have our flashlight, and let's go ahead and drain some battery.

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And let's go ahead and see if our battery spawned on the map.

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So let's go ahead and look around and see if we can find any batteries anywhere we walk around.

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Hopefully we can find one here soon.

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And perfect.

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Here's a battery right here laying on our shelf.

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As you can see, you can kind of see it glowing here in the darkness.

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And now that our battery is at 87, we should be able to click it.

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And unfortunately nothing is happening when we are clicking our battery.

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So let's go ahead and figure out why that is.

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Alrighty.

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And the reason why our on click function is actually not working is because of this condition.

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Check right here.

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We forgot to include a Not statement because we want to return when we do not have a flashlight, and

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not when we do have a flashlight.

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So hopefully that should have fixed our problem and we can go ahead and test out our story again.

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Okay.

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So let's go ahead and go look for our battery again.

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And as we go up to it let's go ahead and click it and see what happens.

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Perfect.

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And just like that we played the sound and we got more battery added to our flashlight.

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And as you can see, our battery is also no longer here.

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And we can't click anything here.

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We're going to have to wait for it to respond after 50s.

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But let's go ahead and find another battery somewhere around our map.

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Take a quick look around, see if we can find another battery.

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Here we go.

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Here's another battery.

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If we go ahead and click this one, we get our nice battery added to our flashlight and we can keep

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looking around.

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And actually let's go ahead and go back and see when this battery right here responds.

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So we'll wait a little bit.

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And just like that, our battery respawn and we could go ahead and grab it and get more charge added

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to our battery.

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Very nice.

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So that wraps up everything we needed to do for this lecture, and I'll go ahead and see you in the

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next one.