feat(battleship): add full placement/battle phases + metadata support + action-based moves

- Added Battleship Fleet definition (carrier, battleship, cruiser, submarine, destroyer)
- Implemented action-based MovePayload (`action: "place" | "shoot"`)
- Added placement and shot validation (ValidatePlacementMove, ValidateShotMove)
- Added ApplyPlacement and ApplyShot with correct ship placement + hit/miss logic
- Added pX_placed, pX_ready tracking and phase switching (placement → battle)
- Added Metadata field to MatchState (for phase/ready tracking)
- Updated MatchInit to initialize placement phase and readiness flags
- Updated MatchLoop to enforce turn order only during battle phase
- Added debug logging for state broadcasts
- Fixed protobuf dependency marking as indirect

plugins/games/battleship.go

@@ -6,6 +6,14 @@ import (
     "localrepo/plugins/structs"
 )
 
+var Fleet = map[string]int{
+  "carrier":    5,
+  "battleship": 4,
+  "cruiser":    3,
+  "submarine":  3,
+  "destroyer":  2,
+}
+
 //
 // BATTLESHIP RULES IMPLEMENTATION
 //
@@ -90,11 +98,39 @@ func (b *BattleshipRules) AssignPlayerSymbols(players []*structs.Player) {
 // ------------------------------
 
 func (b *BattleshipRules) ValidateMove(state *structs.MatchState, playerIdx int, payload MovePayload) bool {
+    switch payload.Action {
+    case "place":
+        return b.ValidatePlacementMove(state, playerIdx, payload)
+    case "shoot":
+        return b.ValidateShotMove(state, playerIdx, payload)
+    default:
+        return false
+    }
+}
+
+func (b *BattleshipRules) ValidatePlacementMove(state *structs.MatchState, playerIdx int, payload MovePayload) bool {
+    // Allow placement until player placed all ships
+    if state.Metadata["phase"] != "placement" {
+        return false
+    }
+    key := fmt.Sprintf("p%d_placed", playerIdx)
+    placed := 0
+    if state.Metadata[key] != nil {
+        placed = state.Metadata[key].(int)
+    }
+    return placed < len(Fleet)
+}
+
+func (b *BattleshipRules) ValidateShotMove(state *structs.MatchState, playerIdx int, payload MovePayload) bool {
+    if state.Metadata["phase"] != "battle" {
+        return false
+    }
     rf, ok1 := payload.Data["row"].(float64)
     cf, ok2 := payload.Data["col"].(float64)
     if !ok1 || !ok2 {
         return false
     }
+
     r := int(rf)
     c := int(cf)
 
@@ -108,8 +144,7 @@ func (b *BattleshipRules) ValidateMove(state *structs.MatchState, playerIdx int,
         return false
     }
 
-    // can't shoot same cell twice
-    if !shotBoard.IsEmpty(r, c) {
+    if !shotBoard.IsEmpty(r, c) { // already shot
         return false
     }
 
@@ -119,11 +154,14 @@ func (b *BattleshipRules) ValidateMove(state *structs.MatchState, playerIdx int,
 // -----------------------------
 // APPLY MOVE (MODE B — CLASSIC)
 // -----------------------------
-func (b *BattleshipRules) ApplyMove(
+func (b *BattleshipRules) ApplyShot(
   state *structs.MatchState,
   playerIdx int,
   payload MovePayload,
 ) (bool, bool, int, bool) {
+  if !b.bothPlayersReady(state) {
+    return false, false, -1, false
+  }
 
   r := int(payload.Data["row"].(float64))
   c := int(payload.Data["col"].(float64))
@@ -152,6 +190,115 @@ func (b *BattleshipRules) ApplyMove(
   return true, over, winner, hit
 }
 
+func (b *BattleshipRules) ApplyMove(
+    state *structs.MatchState,
+    playerIdx int,
+    payload MovePayload,
+) (bool, bool, int, bool) {
+
+    switch payload.Action {
+    case "place":
+        return b.ApplyPlacement(state, playerIdx, payload)
+    case "shoot":
+        return b.ApplyShot(state, playerIdx, payload)
+    default:
+        return false, false, -1, false
+    }
+}
+
+func (b *BattleshipRules) ApplyPlacement(
+    state *structs.MatchState,
+    playerIdx int,
+    payload MovePayload,
+) (bool, bool, int, bool) {
+
+    shipName, _ := payload.Data["ship"].(string)
+    rf, _ := payload.Data["row"].(float64)
+    cf, _ := payload.Data["col"].(float64)
+    dir, _ := payload.Data["dir"].(string)
+
+    r := int(rf)
+    c := int(cf)
+
+    size, ok := Fleet[shipName]
+    if !ok {
+        return false, false, -1, false // invalid ship name
+    }
+
+    shipKey := fmt.Sprintf("p%d_ships", playerIdx)
+    shipBoard := state.Boards[shipKey]
+
+    // Validate placement
+    if !b.validatePlacement(shipBoard, r, c, size, dir) {
+        return false, false, -1, false
+    }
+
+    // Place the ship
+    if dir == "h" {
+        for i := 0; i < size; i++ {
+            shipBoard.Set(r, c+i, "S")
+        }
+    } else { // vertical
+        for i := 0; i < size; i++ {
+            shipBoard.Set(r+i, c, "S")
+        }
+    }
+
+    // Track ships placed by player
+    placedCountKey := fmt.Sprintf("p%d_placed", playerIdx)
+    count := state.Metadata[placedCountKey]
+    if count == nil {
+        state.Metadata[placedCountKey] = 1
+    } else {
+        state.Metadata[placedCountKey] = count.(int) + 1
+    }
+
+    // If all 5 ships placed → ready
+    if state.Metadata[placedCountKey].(int) == len(Fleet) {
+        readyKey := fmt.Sprintf("p%d_ready", playerIdx)
+        state.Metadata[readyKey] = true
+    }
+
+    // Check if both players are ready
+    if b.bothPlayersReady(state) {
+        state.Metadata["phase"] = "battle"
+    }
+
+    return true, false, -1, false
+}
+
+func (b *BattleshipRules) validatePlacement(board *structs.Board, r, c, size int, dir string) bool {
+    rows, cols := board.Rows, board.Cols
+
+    if dir == "h" {
+        if c+size > cols {
+            return false
+        }
+        for i := 0; i < size; i++ {
+            if board.Get(r, c+i) != "" {
+                return false
+            }
+        }
+    } else {
+        if r+size > rows {
+            return false
+        }
+        for i := 0; i < size; i++ {
+            if board.Get(r+i, c) != "" {
+                return false
+            }
+        }
+    }
+    return true
+}
+
+func (b *BattleshipRules) bothPlayersReady(state *structs.MatchState) bool {
+    r0 := state.Metadata["p0_ready"]
+    r1 := state.Metadata["p1_ready"]
+
+    return r0 == true && r1 == true
+}
+
 // ------------------------------
 // CheckGameOver
 // ------------------------------

plugins/games/rules.go

@@ -6,7 +6,8 @@ import "localrepo/plugins/structs"
 // It is intentionally untyped (map[string]interface{}) so each game
 // can define its own move structure (e.g., row/col, coordinate, action type, etc.)
 type MovePayload struct {
-    Data map[string]interface{} `json:"data"`
+    Action string                 `json:"action"` // "place" or "shoot"
+    Data map[string]interface{}   `json:"data"`
 }
 
 // GameRules defines a generic interface for match logic.