ItemFactory.AddItemToDatabase(
    itemName: "Active_Boost", // Internal itemName of Rocket Boots
    cooldown: 3f              // 3 second cooldown
);

ItemFactory.AddItemToDatabase(
    itemName: "ExampleItem",
    triggerType: ItemTriggerType.Continious, // Item will trigger continuously, as often as it is allowed to
    cooldown: 3f                             // However, its cooldown will only allow it to trigger every 3 seconds
);

ItemFactory.AddItemToDatabase(
    itemName: "ExampleItem",
    title: new UnlocalizedString("Example Item"),                                 // The title displayed at the top of the item tooltip
    triggerDescription: new UnlocalizedString("This item's trigger description"), // Item trigger description
    description: new UnlocalizedString("This item's description"),                // Item Description (I don't know which description is which at the moment)
    flavorText: new UnlocalizedString("Some flavour text about this item")        // The flavour text at the bottom of the item tooltop
);

ItemFactory.AddItemToDatabase(
    itemName: "ExampleItem",
    stats: ItemFactory.NewPlayerStats(maxEnergy: new PlayerStat { baseValue = 50f }) // Add 50 max energy to the player when they have this item
);

ItemFactory.AddItemToDatabase(
    itemName: "ExampleItem",
    triggerType: ItemTriggerType.GetResource,                                     // ItemTriggerType.GetResource triggers when the player picks up a spark
    effects: new List<ItemEffect>
    {
        new AddVariable_Effect { amount = 1f, variableType = VariableType.Energy} // AddVariable_Effect adds an effect to the player
    }
);

ItemFactory.AddItemToDatabase(
    itemName: "ExampleItem",
    triggerType: ItemTriggerType.GetResource,                                     // ItemTriggerType.GetResource triggers when the player picks up a spark
    triggerConditions: new List<ItemTrigger>
    {
        new ChanceCheck_IT { probability = 0.5f }                                 // ChanceCheck_IT only allows the item to trigger sometimes at random
    },
    effects: new List<ItemEffect>
    {
        new AddVariable_Effect { amount = 1f, variableType = VariableType.Energy} // AddVariable_Effect adds an effect to the player
    }
);

using Landfall.Modding;
using Landfall.Haste;
using CustomItemLib;

namespace ExampleItems
{
    [LandfallPlugin]
    public class ExampleItems
    {
        static ExampleItems()
        {
            ItemFactory.ItemsLoaded += LoadCustomItems; // Subscribe your method to ItemFactory.ItemsLoaded so it runs when the ItemDatabase loads items
            // Your plugin's other initialization code
        }
        private static void LoadCustomItems() // Put all of your AddItemToDatabase calls in a method that you can then subscribe to ItemsLoaded (seen above)
        {
            ItemFactory.AddItemToDatabase( // A custom item
                itemName: "ExampleItem1",
                triggerType: ItemTriggerType.Continious,
                cooldown: 3f
            );

            ItemFactory.AddItemToDatabase( // Another custom item
                itemName: "ExampleItem2",
                triggerType: ItemTriggerType.GetResource,
                effects: new List<ItemEffect>
                {
                    new AddVariable_Effect { amount = 1f, variableType = VariableType.Energy}
                }
            );
        }
    }
}

ItemFactory.AddItemToDatabase(
    itemName: "BrittleBreastplate", // The actual itemName is MaxHealthButDieOnOkOrBadLanding, but we're making a custom copy
    rarity: Rarity.Epic,
    itemTags: new List<ItemTag>     // I think these are just for flavour, I don't know if they even have an effect ingame
    {
        ItemTag.Object,
        ItemTag.Fantasy,
        ItemTag.Captain,
        ItemTag.Heir,
        ItemTag.Agency
    },
    title: new LocalizedString("Items", "MaxHealthButDieOnOkOrBadLanding_title"), // Reference the actual Brittle Breastplate's title
    triggerDescription: new LocalizedString("Items", "MaxHealthButDieOnOkOrBadLanding_triggerDesc"), // and triggerDescription
    description: new LocalizedString("Items", "MaxHealthButDieOnOkOrBadLanding_desc"),               // and description
    flavorText: new LocalizedString("Items", "MaxHealthButDieOnOkOrBadLanding_flavor"),              // and flavorText
    cooldown: 1f,
    triggerType: ItemTriggerType.Landing, // Brittle Breastplate's damage is triggered by landing
    triggerConditions: new List<ItemTrigger>
    {
        new LandingType_IT
        {
            landingType = LandingType.Ok,                           // Lets the item trigger if the landing was Ok
            compareType = LandingType_IT.CompareType.WorseOrSameAs, // or worse
        }
    },
    effects: new List<ItemEffect>
    {
        new AddVariable_Effect { amount = 50f, variableType = VariableType.Damage } // Deal 50 damage to the player when triggered
    },
    stats: ItemFactory.NewPlayerStats(maxHealth: new PlayerStat { multiplier = 2.5f }) // Give the player +150% max health when they have this
);

string itemName;                                                    // itemName is required, and is the internal name of your item.
bool autoUnlocked = true;                                           // Whether to unlock the item automatically
bool minorItem = false;                                             // Whether the item is considered a "minorItem", which can't appear in shops
Rarity rarity = Rarity.Common;                                      // The item's rarity
List<ItemTag> itemTags = new List<ItemTag>();                       // The item's tags (seemingly cosmetic)
LocalizedString title = new UnlocalizedString("Missing Title");     // The item's tooltip title
bool usesTriggerDescription = false;                                // Whether to overwrite the auto-generated trigger description with yours.
LocalizedString triggerDescription = new UnlocalizedString("Item is missing trigger description") // The trigger description (eg. "On Activate,")
bool usesEffectDescription = false;                                 // Whether to add your custom description on top of the auto-generated one.
LocalizedString description = new UnlocalizedString("Item is missing description"); // The effect description (eg. "Gain +100% Boost.")
LocalizedString flavorText = new UnlocalizedString("Dalil didn't explain what this item is..."); // The item's flavour text at the bottom of the tooltip
float iconScaleModifier = 1f;                                       // Not sure, maybe for scaling meshes that are the wrong size?
bool statsAfterTrigger = false;                                     // Whether to invert the order of "description" and "trigger description"
float cooldown = 0f;                                                // The minimum time between this item's triggers
ItemTriggerType triggerType = ItemTriggerType.None;                 // The type of event that causes this item to attempt to trigger
List<ItemTrigger> triggerConditions = new List<ItemTrigger> { };    // The item's trigger conditions
List<ItemEffect> effects = new List<ItemEffect> { };                // The item's effects when triggered
PlayerStats stats = ItemFactory.NewPlayerStats();                   // The PlayerStats object that will be added to the player when they get the item
UnityEvent effectEvent = new UnityEvent();                          // Used as an alternative to effects and trigger conditions. Not fully understood yet
UnityEvent keyDownEvent = new UnityEvent();                         // Used as an alternative to effects and trigger conditions. Not fully understood yet
UnityEvent keyUpEvent = new UnityEvent();                           // Used as an alternative to effects and trigger conditions. Not fully understood yet

FactSystem.SetFact(new Fact("[CustomItem]_ShowItem"), 1.0f);

FactSystem.SetFact(new Fact("item_unlocked_[CustomItem]"), 1.0f);

On.SaveSystem.Load += (orig) => {
    HasteSave save = orig();
    UnlockItems();
    return save;
};

static void UnlockItems()
{
    FactSystem.SetFact(new Fact("[CustomItem]_ShowItem"), 1.0f);
    FactSystem.SetFact(new Fact("item_unlocked_[CustomItem]"), 1.0f);
}