you can use techs now wow

src/entity/character.rs

@@ -157,7 +157,7 @@ pub struct CharacterAppearance {
 }
 
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct TechLevel(pub u8);
 
 #[derive(Clone, Debug, Default)]
@@ -167,16 +167,14 @@ pub struct CharacterTechniques {
 
 impl CharacterTechniques {
     pub fn set_tech(&mut self, tech: Technique, level: TechLevel) {
-        self.techs.insert(tech, TechLevel(level.0 - 1));
+        self.techs.insert(tech, TechLevel(level.0));
     }
 
-    // from_bytes
-
     pub fn as_bytes(&self) -> [u8; 20] {
         self.techs.iter()
             .fold([0xFF; 20], |mut techlist, (tech, level)| {
                 let index = tech.as_value();
-                techlist[index as usize] = level.0;
+                techlist[index as usize] = level.0 - 1;
                 techlist
             })
     }

src/ship/items/apply_item.rs

@@ -1,12 +1,14 @@
 use std::convert::TryInto;
 use futures::future::join_all;
 use thiserror::Error;
+use anyhow::Context;
 use rand::SeedableRng;
 use rand::distributions::{WeightedIndex, Distribution};
 use crate::entity::gateway::{EntityGateway, GatewayError};
-use crate::entity::character::CharacterEntity;
+use crate::entity::character::{CharacterEntity, TechLevel};
 use crate::entity::item::mag::{MagCell, MagCellError};
 use crate::entity::item::tool::{Tool, ToolType};
+use crate::entity::item::tech::{TechniqueDisk, Technique};
 use crate::entity::item::{ItemDetail, ItemEntityId};
 use crate::ship::items::state::{ItemStateProxy, ItemStateError};
 use crate::ship::items::inventory::{InventoryItem, InventoryItemDetail};
@@ -18,7 +20,7 @@ pub enum ApplyItemError {
     NoCharacter,
     #[error("item not equipped")]
     ItemNotEquipped,
-    #[error("invalid item")]
+    #[error("could not use item invalid item")]
     InvalidItem,
     #[error("gateway error {0}")]
     GatewayError(#[from] GatewayError),
@@ -307,6 +309,21 @@ where
     
 }
 
+async fn apply_tech<'a, EG>(item_state: &mut ItemStateProxy,
+                            entity_gateway: &mut EG,
+                            character: &mut CharacterEntity,
+                            _entity_id: ItemEntityId,
+                            tech: TechniqueDisk)
+                            -> Result<Vec<ApplyItemAction>, anyhow::Error>
+where
+    EG: EntityGateway + ?Sized,
+{
+    // TODO: make sure the class can learn that specific tech
+    character.techs.set_tech(tech.tech, TechLevel(tech.level as u8));
+    entity_gateway.save_character(character).await.unwrap();
+    Ok(vec![ApplyItemAction::UpdateCharacter(Box::new(character.clone()))])
+
+}
 
 pub async fn apply_item<'a, EG>(item_state: &mut ItemStateProxy,
                                 entity_gateway: &mut EG,
@@ -320,7 +337,11 @@ where
         InventoryItemDetail::Individual(individual_item) => {
             match individual_item.item {
                 ItemDetail::Tool(tool) => apply_tool(item_state, entity_gateway, character, individual_item.entity_id, tool.tool).await,
-                _ => Err(ApplyItemError::InvalidItem.into())
+                ItemDetail::TechniqueDisk(tech) => apply_tech(item_state, entity_gateway, character, individual_item.entity_id, tech).await,
+                _ => Err(anyhow::Error::from(ApplyItemError::InvalidItem))
+                    .with_context(|| {
+                        format!("item {:?}", individual_item)
+                    })
             }
         },
         InventoryItemDetail::Stacked(stacked_item) => {

tests/test_item_use.rs

@@ -2,6 +2,7 @@ use elseware::common::serverstate::{ClientId, ServerState};
 use elseware::entity::gateway::{EntityGateway, InMemoryGateway};
 use elseware::entity::item;
 use elseware::ship::ship::{ShipServerState, RecvShipPacket};
+use elseware::entity::character::TechLevel;
 //use elseware::ship::items::{ClientItemId, ActiveItemEntityId, HeldItemType, FloorItemType};
 
 use libpso::packet::ship::*;
@@ -304,6 +305,92 @@ async fn test_jackolantern() {
     }
 }
 
+
+#[async_std::test]
+async fn test_use_barta_1() {
+    let mut entity_gateway = InMemoryGateway::default();
+
+    let (user1, char1) = new_user_character(&mut entity_gateway, "a1", "a", 1).await;
+
+    /*
+    let mut p1_inv = Vec::new();
+    for tool in vec![item::tool::ToolType::PowerMaterial, item::tool::ToolType::].into_iter() {
+        let mut item = Vec::new();
+        for _ in 0..5usize {
+            item.push(entity_gateway.create_item(
+                item::NewItemEntity {
+                    item: item::ItemDetail::Tool(
+                        item::tool::Tool {
+                            tool: tool
+                        }
+                    ),
+                }).await.unwrap());
+        }
+        p1_inv.push(item::InventoryItemEntity::Stacked(item));
+}*/
+    let inv = vec![
+        entity_gateway.create_item(
+            item::NewItemEntity {
+                item: item::ItemDetail::TechniqueDisk(
+                    item::tech::TechniqueDisk {
+                        tech: item::tech::Technique::Foie,
+                        level: 3,
+                    }
+                )
+            }
+        ).await.unwrap(),
+        entity_gateway.create_item(
+            item::NewItemEntity {
+                item: item::ItemDetail::TechniqueDisk(
+                    item::tech::TechniqueDisk {
+                        tech: item::tech::Technique::Barta,
+                        level: 4,
+                    }
+                )
+            }
+        ).await.unwrap(),
+        entity_gateway.create_item(
+            item::NewItemEntity {
+                item: item::ItemDetail::TechniqueDisk(
+                    item::tech::TechniqueDisk {
+                        tech: item::tech::Technique::Zonde,
+                        level: 5,
+                    }
+                )
+            }
+        ).await.unwrap()
+    ];
+
+    entity_gateway.set_character_inventory(&char1.id, &item::InventoryEntity::new(inv)).await.unwrap();
+
+    let mut ship = Box::new(ShipServerState::builder()
+        .gateway(entity_gateway.clone())
+        .build());
+    log_in_char(&mut ship, ClientId(1), "a1", "a").await;
+    join_lobby(&mut ship, ClientId(1)).await;
+    create_room(&mut ship, ClientId(1), "room", "").await;
+
+    ship.handle(ClientId(1), RecvShipPacket::Message(Message::new(GameMessage::PlayerUseItem(PlayerUseItem {
+        client: 0,
+        target: 0,
+        item_id: 0x10000,
+    })))).await.unwrap();
+
+    ship.handle(ClientId(1), RecvShipPacket::Message(Message::new(GameMessage::PlayerUseItem(PlayerUseItem {
+        client: 0,
+        target: 0,
+        item_id: 0x10002,
+    })))).await.unwrap();
+
+    let characters = entity_gateway.get_characters_by_user(&user1).await.unwrap();
+    let char = characters[0].as_ref().unwrap();
+
+    assert_eq!(char.techs.techs.len(), 2);
+    assert_eq!(char.techs.techs.get(&item::tech::Technique::Foie).unwrap(), &TechLevel(3));
+    assert_eq!(char.techs.techs.get(&item::tech::Technique::Zonde).unwrap(), &TechLevel(5));
+    assert!(char.techs.techs.get(&item::tech::Technique::Barta).is_none());
+}
+
 // TODO: tests for ALL ITEMS WOW
 
 /*