DynamicItemScan Modded Bingo

This is a 1.12.2 server side only forge mod.

What is this mod about?

This mod lets you play bingo in Minecraft, with all loaded vanilla and mod items that are obtainable in survival as goals. Each team or single player gets a copy of a bingo card that contains a grid of items. The square grid can be varied in size, from 3x3 to 9x9. Items in the card are crossed out by finding or crafting them in survival mode. The first team or single player to get a full row, column or diagonal, wins!

What´s so special about this mod?

The dynamic item scan This mod goes through all loaded loot tables, crafting recipes, villager trades and furnace smelting recipes of all present mods and records all new items that it finds. It also tries out every possible combination of LootFunctions, that are applied on items in LootTables, by doing a binary permutation, to catch all items that can appear or be crafted in survival mode. The full item registry is not searched, because it could contain mere creative mode items that cannot be obtained in survival mode. Items are ensured to be unique, such that the probability of each item appearing in the bingo card is the same. To be added to the final item list, an item must not be identical in all registry name, metadata and NBT tag to an item already in the list. Note that this works regardless of what mods are installed. All mods are scanned, if the contents of the mods folder change, after a server restart, the item pool adapts automatically. Key caveats of the dynamic item scan:

We cannot ensure the scan will find every obtainable item. If an item is not registered in a crafting or smelting recipe or a loot table, but is rather obtained by a mod-added machine, it will not be detected.
Crafting recipe ingredients are assumed to be obtainable to mitigate the point above, which may not be the case
We cannot detect which enchantments are applicable to which items. To add some enchanted items, enchanted books of each registered enchantment are added to the item pool.

The "at least" principle - how are items checked for equality? The key idea is to treat the required item in the bingo card and the found item in the player´s inventory asymmetrically. Two items are called equal, when the found item meets at least all properties of the required item. The found item can have excess properties. Note that:

count is ignored
Item metadata and item damage use the same variable. If the item is marked to be damageable, if it "thinks that it´s damageable", the variable is used for damage and we ignore it as a property

Consider the following example:

Property	found item	required item
Registry name	stone_hoe	stone_hoe
Metadata	0	23

The items would not be considered equal, since the required item has a specified metadata, and the found item has not.

Property	found item	required item
Registry name	stone_hoe	stone_hoe
Metadata	23	0

Here however, the items would be considered equal, since the found item fulfills more properties than the required item has. The same would be true if the found item is enchanted and the required item is not, or the found item has more enchantments than the required item. Variable bingo card sizes Normally, bingo is played with a 5x5 square card. Here, you can customize the bingo card size ranging from 3x3 up to 9x9. Players can rejoin When a player leaves, the mod will remember the team that he was in. Once he rejoins and the game is still running, he will be automatically put in the right team, with progress on the card updated.

Game Loop

SET TEAMS -----------> START --------> NATURAL FINISH (BINGO) / CANCEL -------> SET TEAMS

Commands

/teams: Sets the specified teams
/start: starts a new game with specified settings
/cancel: cancels a currently running game

Usage:

/teams [player1,player2][player3] (brackets needed!) results in

Team 1 Team 2
player1, player2 player3
/start 3-9(grid-size) 3-6(backpack-size) true-false(different cards for different teams) true-false(with diamond pickaxe for everyone) true-false(with inventory crafting table for everyone) true-false(keepInventory) true-false(noHunger)
/cancel

Why the "z"´s?

The item scan implies that this mod needs to be loaded after all other mods have loaded in their items. Therefore, since the forge mod loader tends to load mods alphabetically, the modid as well as the jar name of this mod start with 3 "z".

Other

Packets This mod modifies ingoing and outgoing packets that are necessary for client-server-communication. The mod was tested, but note that any error in the serverbound and clientbound packet pipeline will likely crash the server and/or the client. Reflection This project uses reflection to make its features work. Use of reflection is usually not recommended. Please note that this makes the project highly unstable and version specific. The mod was tested with forge version 1.12.2-14.23.5.2847. In theory, other 1.12.2 versions should also work, but weren´t tested. I do not take any responsibility. Cloning and Building This Mod was developed for Minecraft 1.12.2, and requires JDK 1.8.0 for building. Test case version was JDK version 1.8.0_302.

Clone the repository (see sources link) in a local directory of your choice
Make sure you have a JDK version 1.8.0 installed somewhere on your device
Open Command Prompt in the cloned directory
use gradle wrapper to build, specifying the java version used:
gradlew build -Dorg.gradle.java.home=PATH_TO_JDK_1.8.0 for Windows
./gradlew build -Dorg.gradle.java.home=PATH_TO_JDK_1.8.0 for Unix

The generated mod jar file will be located in /build/libs and can be pasted into the mods folder of your server.

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Compatibility

Minecraft: Java Edition

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