From 6fa9ee968ebcbd1672fa18fe8176ea8135c2e749 Mon Sep 17 00:00:00 2001
From: Garen Tyler <garentyler@gmail.com>
Date: Wed, 17 Mar 2021 21:16:20 -0600
Subject: [PATCH] Player spawning works

---
 src/mctypes.rs                    | 60 +++++++++++++++++++++++++++++++
 src/server/mod.rs                 |  5 ++-
 src/server/packets/clientbound.rs | 41 +++++++++++++++++++++
 3 files changed, 105 insertions(+), 1 deletion(-)

diff --git a/src/mctypes.rs b/src/mctypes.rs
index 8a1ea93..9cae875 100644
--- a/src/mctypes.rs
+++ b/src/mctypes.rs
@@ -247,6 +247,66 @@ pub mod other {
             Err(io_error("Cannot read MCChat from stream"))
         }
     }
+
+    // TODO: Actually make the MCPosition work.
+    #[derive(Debug, PartialEq, Clone)]
+    pub struct MCPosition {
+        x: MCLong,
+        y: MCLong,
+        z: MCLong,
+    }
+    impl Display for MCPosition {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            write!(
+                f,
+                "({}, {}, {})",
+                self.x,
+                self.y,
+                self.z,
+            )
+        }
+    }
+    impl TryFrom<Vec<u8>> for MCPosition {
+        type Error = &'static str;
+        fn try_from(_bytes: Vec<u8>) -> Result<Self, Self::Error> {
+            Err("Cannot read MCPosition from bytes")
+        }
+    }
+    impl Into<Vec<u8>> for MCPosition {
+        fn into(self) -> Vec<u8> {
+            // Just output
+            // {"text": "<data>"}
+            let mut out = vec![];
+            let mut temp = vec![];
+            temp.extend_from_slice(
+                &(
+                    (
+                        ((Into::<i64>::into(self.x) & 0x3FFFFFF) << 38)
+                            | ((Into::<i64>::into(self.y) & 0xFFF) << 26)
+                            | (Into::<i64>::into(self.z) & 0x3FFFFFF)
+                    ) as u64
+                ).to_be_bytes()
+            );
+            // temp.extend_from_slice(&"{\"text\": \"".to_owned().into_bytes());
+            // temp.extend_from_slice(&self.text.value.into_bytes());
+            // temp.extend_from_slice(&"\"}".to_owned().into_bytes());
+            out.extend_from_slice(&Into::<Vec<u8>>::into(MCVarInt::from(temp.len() as i32)));
+            out.extend_from_slice(&temp);
+            out
+        }
+    }
+    impl MCPosition {
+        pub fn new() -> MCPosition {
+            MCPosition {
+                x: 0.into(),
+                y: 0.into(),
+                z: 0.into(),
+            }
+        }
+        pub async fn read(_t: &mut TcpStream) -> tokio::io::Result<Self> {
+            Err(io_error("Cannot read MCPosition from stream"))
+        }
+    }
 }
 
 /// All the numbers, from `i8` and `u8` to `i64` and `u64`, plus `VarInt`s.
diff --git a/src/server/mod.rs b/src/server/mod.rs
index c9fbd2a..bbf30d7 100644
--- a/src/server/mod.rs
+++ b/src/server/mod.rs
@@ -225,7 +225,7 @@ impl NetworkClient {
                 // TODO: S->C Player Position and Look
                 let playerpositionandlook = PlayerPositionAndLook::new();
                 // TODO: Retrieve player position from storage.
-                // playerpositionandlook.write(&mut self.stream).await.unwrap();
+                playerpositionandlook.write(&mut self.stream).await.unwrap();
                 debug!("{:?}", playerpositionandlook);
                 // TODO: S->C Player Info (Add Player action) (1.16?)
                 // TODO: S->C Player Info (Update latency action) (1.16?)
@@ -234,6 +234,9 @@ impl NetworkClient {
                 // TODO: S->C Chunk Data
                 // TODO: S->C World Border
                 // TODO: S->C Spawn Position
+                let spawnposition = SpawnPosition::new();
+                spawnposition.write(&mut self.stream).await.unwrap();
+                debug!("{:?}", spawnposition);
                 // TODO: S->C Player Position and Look
                 // TODO: C->S Teleport Confirm
                 // TODO: C->S Player Position and Look
diff --git a/src/server/packets/clientbound.rs b/src/server/packets/clientbound.rs
index 1c3eec8..9962b5a 100644
--- a/src/server/packets/clientbound.rs
+++ b/src/server/packets/clientbound.rs
@@ -391,3 +391,44 @@ impl PlayerPositionAndLook {
         Ok(())
     }
 }
+
+// TODO: Actually send the position.
+#[derive(Debug, Clone)]
+pub struct SpawnPosition {
+    position: MCPosition,
+}
+impl Into<Vec<u8>> for SpawnPosition {
+    fn into(self) -> Vec<u8> {
+        let mut out = vec![];
+        let mut temp: Vec<u8> = MCVarInt::from(0x05).into(); // 0x05 Spawn Position.
+        // temp.extend_from_slice(&Into::<Vec<u8>>::into(self.position));
+        temp.extend_from_slice(&0u64.to_be_bytes());
+        out.extend_from_slice(&Into::<Vec<u8>>::into(MCVarInt::from(temp.len() as i32)));
+        out.extend_from_slice(&temp);
+        out
+    }
+}
+impl TryFrom<Vec<u8>> for SpawnPosition {
+    type Error = &'static str;
+    fn try_from(_bytes: Vec<u8>) -> Result<Self, Self::Error> {
+        Err("unimplemented")
+    }
+}
+impl SpawnPosition {
+    pub fn new() -> Self {
+        SpawnPosition {
+            position: MCPosition::new(),
+        }
+    }
+    pub async fn read(t: &mut TcpStream) -> tokio::io::Result<Self> {
+        let mut spawnposition = SpawnPosition::new();
+        spawnposition.position = MCPosition::read(t).await?;
+        Ok(spawnposition)
+    }
+    pub async fn write(&self, t: &mut TcpStream) -> tokio::io::Result<()> {
+        for b in Into::<Vec<u8>>::into(self.clone()) {
+            write_byte(t, b).await?;
+        }
+        Ok(())
+    }
+}