From 802968df3dea486a2aaf8b0cbe439634c27a3a64 Mon Sep 17 00:00:00 2001
From: Slavasil <subvia@proton.me>
Date: Mon, 2 Nov 2026 14:29:23 +0300
Subject: [PATCH] implement ship placing UI

---
 frontend/src/components/GameScreen.jsx        | 157 +++++-
 frontend/src/components/SeaBoard.jsx          | 109 +++++
 .../src/components/ShipPlacementScreen.jsx    | 455 ++++++++++++++++++
 frontend/src/game.js                          |  68 ++-
 frontend/src/shipLogic.js                     | 226 +++++++++
 frontend/src/styles.css                       | 405 ++++++++++++++++
 6 files changed, 1379 insertions(+), 41 deletions(-)
 create mode 100644 frontend/src/components/SeaBoard.jsx
 create mode 100644 frontend/src/components/ShipPlacementScreen.jsx
 create mode 100644 frontend/src/shipLogic.js

diff --git a/frontend/src/components/GameScreen.jsx b/frontend/src/components/GameScreen.jsx
index 94bfcf7..c953966 100644
--- a/frontend/src/components/GameScreen.jsx
+++ b/frontend/src/components/GameScreen.jsx
@@ -1,19 +1,70 @@
-import { useEffect, useRef, useState } from 'react'
-import { createGameConnection } from '../game'
+import { useEffect, useRef, useState, useCallback } from 'react'
+import {
+  createGameConnection,
+  STATE_PLACING_SHIPS,
+  STATE_OPPONENT_READY,
+  STATE_WAIT_OPPONENT_READY,
+  STATE_YOUR_TURN,
+  STATE_WAIT_OPPONENT_TURN,
+} from '../game'
+import ShipPlacementScreen from './ShipPlacementScreen'
 
 export default function GameScreen({ session, onLeave }) {
-  const [status, setStatus] = useState('connecting') // 'connecting' | 'ready' | 'error'
+  const [status, setStatus] = useState('connecting') // 'connecting' | 'placing' | 'game' | 'error'
+  const [gameState, setGameState] = useState(STATE_PLACING_SHIPS)
+  const [isSubmitting, setIsSubmitting] = useState(false)
+  const [opponentReady, setOpponentReady] = useState(false)
   const [error, setError] = useState(null)
+
+  const connectionRef = useRef(null)
   const attemptRef = useRef(0)
 
   useEffect(() => {
     const attempt = ++attemptRef.current
     let cancelled = false
-    const connection = createGameConnection(session)
+    const connInstance = createGameConnection(session)
 
-    connection.promise
-      .then(() => {
-        if (!cancelled && attempt === attemptRef.current) setStatus('ready')
+    connInstance.promise
+      .then((conn) => {
+        if (cancelled || attempt !== attemptRef.current) return
+        connectionRef.current = conn
+
+        conn.onState = (newState) => {
+          if (cancelled || attempt !== attemptRef.current) return
+
+          if (newState === STATE_OPPONENT_READY) {
+            setOpponentReady(true)
+          } else if (
+            newState === STATE_WAIT_OPPONENT_READY ||
+            newState === STATE_YOUR_TURN ||
+            newState === STATE_WAIT_OPPONENT_TURN
+          ) {
+            setIsSubmitting(false)
+            setGameState(newState)
+            setStatus('game')
+          }
+        }
+
+        conn.onEnd = (_code, reason) => {
+          if (cancelled || attempt !== attemptRef.current) return
+          setIsSubmitting(false)
+          setError(reason || 'Партия завершена')
+          setStatus('error')
+        }
+
+        conn.onClose = () => {
+          if (cancelled || attempt !== attemptRef.current) return
+          setIsSubmitting(false)
+          setStatus((prev) => {
+            if (prev !== 'error') {
+              setError('Соединение с сервером прервано')
+              return 'error'
+            }
+            return prev
+          })
+        }
+
+        setStatus('placing')
       })
       .catch((err) => {
         if (cancelled || attempt !== attemptRef.current) return
@@ -23,33 +74,89 @@ export default function GameScreen({ session, onLeave }) {
 
     return () => {
       cancelled = true
-      connection.cancel()
+      connInstance.cancel()
     }
   }, [session])
 
+  const handleReady = useCallback((ships) => {
+    if (!connectionRef.current) return
+    setIsSubmitting(true)
+    connectionRef.current.placeShips(ships)
+  }, [])
+
+  // Текст заглушки в зависимости от состояния игры
+  const getGameStubText = () => {
+    switch (gameState) {
+      case STATE_WAIT_OPPONENT_READY:
+        return 'Соперник расставляет корабли...'
+      case STATE_YOUR_TURN:
+        return 'Ваш ход'
+      case STATE_WAIT_OPPONENT_TURN:
+        return 'Соперник ходит'
+      default:
+        return ''
+    }
+  }
+
   return (
-    <div className="page">
-      <main className="search-screen">
-        {status === 'connecting' && (
-          <>
-            <div className="search-label">Подключение к игре...</div>
+    <div className="page game-page">
+      {status === 'connecting' && (
+        <main className="search-screen">
+          <div className="search-label">Подключение к игре...</div>
+          <div className="bouncing-dots" aria-hidden="true">
+            <span />
+            <span />
+            <span />
+          </div>
+        </main>
+      )}
+
+      {status === 'placing' && (
+        <main className="game-screen-main">
+          <ShipPlacementScreen
+            onReady={handleReady}
+            isSubmitting={isSubmitting}
+            opponentReady={opponentReady}
+          />
+        </main>
+      )}
+
+      {status === 'game' && (
+        <main className="search-screen">
+          <div className="search-label">{getGameStubText()}</div>
+          {(gameState === STATE_WAIT_OPPONENT_READY ||
+            gameState === STATE_WAIT_OPPONENT_TURN) && (
             <div className="bouncing-dots" aria-hidden="true">
               <span />
               <span />
               <span />
             </div>
-          </>
-        )}
-        {status === 'ready' && <div className="search-label">Расстановка кораблей</div>}
-        {status === 'error' && (
-          <>
-            <div className="search-error">{error}</div>
-            <button className="btn btn-big btn-secondary" onClick={onLeave}>
-              Назад в меню
-            </button>
-          </>
-        )}
-      </main>
+          )}
+        </main>
+      )}
+
+      {status === 'error' && (
+        <main className="search-screen">
+          <div className="search-error">{error}</div>
+          <button className="btn btn-big btn-secondary" onClick={onLeave}>
+            Назад в меню
+          </button>
+        </main>
+      )}
+
+      {/* Модальный pop-up с надписью "Загрузка...", пока сервер не ответит сменой состояния */}
+      {isSubmitting && (
+        <div className="modal-overlay">
+          <div className="modal loading-modal">
+            <h2 className="modal-title">Загрузка...</h2>
+            <div className="bouncing-dots" style={{ justifyContent: 'center', marginTop: 16 }}>
+              <span />
+              <span />
+              <span />
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   )
 }
diff --git a/frontend/src/components/SeaBoard.jsx b/frontend/src/components/SeaBoard.jsx
new file mode 100644
index 0000000..aa92d44
--- /dev/null
+++ b/frontend/src/components/SeaBoard.jsx
@@ -0,0 +1,109 @@
+import { ROW_LETTERS, COL_NUMBERS } from '../shipLogic'
+
+/**
+ * Компонент игрового поля 10x10 с вертикальной (А-К) и горизонтальной (1-10) линейками.
+ * Линейки идут слева и сверху параллельно полю и отделены небольшим отступом.
+ */
+export default function SeaBoard({
+  ships = [],
+  preview = null,
+  onShipPointerDown,
+  gridRef,
+  className = '',
+}) {
+  return (
+    <div className={`sea-board-wrapper ${className}`}>
+      {/* Пустой угол (пересечение линеек) */}
+      <div className="sea-board-corner" aria-hidden="true" />
+
+      {/* Горизонтальная линейка (цифры 1..10) */}
+      <div className="sea-board-col-ruler" aria-hidden="true">
+        {COL_NUMBERS.map((num) => (
+          <div key={num} className="sea-ruler-cell">
+            {num}
+          </div>
+        ))}
+      </div>
+
+      {/* Вертикальная линейка (буквы А..К) */}
+      <div className="sea-board-row-ruler" aria-hidden="true">
+        {ROW_LETTERS.map((letter) => (
+          <div key={letter} className="sea-ruler-cell">
+            {letter}
+          </div>
+        ))}
+      </div>
+
+      {/* Само игровое поле 10x10 */}
+      <div className="sea-grid-container" ref={gridRef}>
+        {/* Базовая сетка 10x10 клеток */}
+        <div className="sea-grid">
+          {Array.from({ length: 100 }).map((_, idx) => (
+            <div key={idx} className="sea-cell" />
+          ))}
+        </div>
+
+        {/* Слой расставленных кораблей */}
+        <div className="sea-ships-layer">
+          {ships.map((ship) => {
+            if (!ship.placed) return null
+            const isHorizontal = !ship.orientation
+            const left = 3 + ship.x * 33
+            const top = 3 + ship.y * 33
+            const width = isHorizontal ? ship.size * 30 + (ship.size - 1) * 3 : 30
+            const height = isHorizontal ? 30 : ship.size * 30 + (ship.size - 1) * 3
+
+            return (
+              <div
+                key={ship.id}
+                className={`board-ship ${ship.orientation ? 'vertical' : 'horizontal'}`}
+                style={{
+                  left: `${left}px`,
+                  top: `${top}px`,
+                  width: `${width}px`,
+                  height: `${height}px`,
+                }}
+                onPointerDown={(e) => {
+                  if (onShipPointerDown) {
+                    onShipPointerDown(e, ship)
+                  }
+                }}
+              >
+                {Array.from({ length: ship.size }).map((_, segIdx) => (
+                  <div
+                    key={segIdx}
+                    className="ship-segment"
+                    data-segment={segIdx}
+                  />
+                ))}
+              </div>
+            )
+          })}
+        </div>
+
+        {/* Слой призрака при перетаскивании (ghost preview) */}
+        {preview && (
+          <div
+            className={`board-ship ghost-preview ${
+              preview.orientation ? 'vertical' : 'horizontal'
+            } ${preview.isValid ? 'ghost-valid' : 'ghost-invalid'}`}
+            style={{
+              left: `${3 + preview.x * 33}px`,
+              top: `${3 + preview.y * 33}px`,
+              width: `${
+                !preview.orientation ? preview.size * 30 + (preview.size - 1) * 3 : 30
+              }px`,
+              height: `${
+                !preview.orientation ? 30 : preview.size * 30 + (preview.size - 1) * 3
+              }px`,
+            }}
+          >
+            {Array.from({ length: preview.size }).map((_, segIdx) => (
+              <div key={segIdx} className="ship-segment" />
+            ))}
+          </div>
+        )}
+      </div>
+    </div>
+  )
+}
diff --git a/frontend/src/components/ShipPlacementScreen.jsx b/frontend/src/components/ShipPlacementScreen.jsx
new file mode 100644
index 0000000..493d5df
--- /dev/null
+++ b/frontend/src/components/ShipPlacementScreen.jsx
@@ -0,0 +1,455 @@
+import { useState, useRef, useEffect, useCallback } from 'react'
+import SeaBoard from './SeaBoard'
+import {
+  createInitialShips,
+  canPlaceShip,
+  findValidRotation,
+  generateRandomPlacement,
+} from '../shipLogic'
+
+function ShuffleIcon({ size = 20 }) {
+  return (
+    <svg
+      width={size}
+      height={size}
+      viewBox="0 0 12.7 12.7"
+      style={{ display: 'inline-block', verticalAlign: 'middle', flexShrink: 0 }}
+      aria-hidden="true"
+    >
+      <path
+        style={{
+          fill: 'none',
+          stroke: 'currentColor',
+          strokeWidth: 1.2,
+          strokeLinecap: 'round',
+          strokeLinejoin: 'round',
+        }}
+        d="m 9.4816001,7.6107086 c 0,2.5748604 0,2.5748604 0,2.5748604 L 10.700616,8.9665533 Z"
+      />
+      <path
+        style={{
+          fill: 'none',
+          stroke: 'currentColor',
+          strokeWidth: 1.17,
+          strokeLinecap: 'round',
+        }}
+        d="m 1.9172753,3.9133276 h 1.3938432 c 0,0 0.418658,0.043751 0.7439689,0.3929024 l 3.2927061,4.3012881 c 0,0 0.3355245,0.3407588 0.6968466,0.321765 l 1.9478831,-0.00957"
+      />
+      <path
+        style={{
+          fill: 'none',
+          stroke: 'currentColor',
+          strokeWidth: 1.2,
+          strokeLinecap: 'round',
+          strokeLinejoin: 'round',
+        }}
+        d="m 9.4810176,5.2347575 c 0,-2.5749117 0,-2.5749117 0,-2.5749117 L 10.699942,3.878886 Z"
+      />
+      <path
+        style={{
+          fill: 'currentColor',
+          strokeWidth: 1.77,
+          strokeLinecap: 'round',
+        }}
+        d="M 7.9405757,3.3290259 C 7.2803298,3.3554207 6.9286279,3.8253665 6.9286279,3.8253665 L 6.9047744,3.8538074 6.3276981,4.6070341 7.0497314,5.5923757 7.7745171,4.6437321 c 0.01942,-0.01041 0.2210083,-0.1184824 0.240372,-0.1394525 h 9.175e-4 v -9.175e-4 -9.173e-4 h -9.175e-4 v -9.175e-4 h 0.012844 l 1.9633434,0.011009 A 0.5871519,0.5871519 0 0 0 10.580079,3.9299557 0.5871519,0.5871519 0 0 0 9.9938292,3.3400353 L 8.0763583,3.3299434 c -0.04675,-0.00246 -0.091766,-0.00268 -0.1357826,-9.175e-4 z M 4.3432533,7.2006658 3.62122,8.1428873 C 3.4547894,8.317437 3.2641018,8.3428563 3.2569921,8.3438089 H 1.9184323 A 0.5871519,0.5871519 0 0 0 1.3285117,8.9337295 0.5871519,0.5871519 0 0 0 1.9184323,9.5190627 h 1.4211304 l 0.031193,-0.00367 c 0,0 0.6339103,-0.06015 1.1137846,-0.5752412 l 0.020184,-0.021101 0.5605621,-0.7330428 z"
+      />
+    </svg>
+  )
+}
+
+export default function ShipPlacementScreen({
+  onReady,
+  isSubmitting = false,
+  opponentReady = false,
+}) {
+  const [ships, setShips] = useState(createInitialShips)
+  const [activeDrag, setActiveDrag] = useState(null)
+  const shipsRef = useRef(ships)
+  shipsRef.current = ships
+
+  const gridRef = useRef(null)
+  const dragRef = useRef(null)
+
+  const allPlaced = ships.every((s) => s.placed)
+  const placedCount = ships.filter((s) => s.placed).length
+
+  // Очистка класса is-dragging при размонтировании
+  useEffect(() => {
+    return () => {
+      document.body.classList.remove('is-dragging')
+    }
+  }, [])
+
+  // Расчет сетки при перетаскивании
+  const computeGridCandidate = useCallback((ship, pointerPos, orientation, segIndex) => {
+    if (!gridRef.current) return null
+    const rect = gridRef.current.getBoundingClientRect()
+    const cellPitch = 33 // 30px ячейка + 3px gap
+    const pad = 3
+
+    // Вычисляем положение левого верхнего угла корабля (shipLeft, shipTop) на экране:
+    const shipLeft = pointerPos.x - (!orientation ? segIndex * cellPitch + 15 : 15)
+    const shipTop = pointerPos.y - (orientation ? segIndex * cellPitch + 15 : 15)
+
+    // Положение левого верхнего угла корабля относительно сетки:
+    const relX = shipLeft - (rect.left + pad)
+    const relY = shipTop - (rect.top + pad)
+
+    // Симметричное математическое округление к ближайшей колонке и строке сетки:
+    const targetX = Math.round(relX / cellPitch)
+    const targetY = Math.round(relY / cellPitch)
+
+    const maxX = orientation ? targetX : targetX + ship.size - 1
+    const maxY = orientation ? targetY + ship.size - 1 : targetY
+
+    // Проекция отображается ТОЛЬКО если корабль полностью внутри поля 10x10:
+    if (targetX < 0 || targetY < 0 || maxX >= 10 || maxY >= 10) {
+      return null
+    }
+
+    // Проверяем возможность размещения (нет пересечений и зазор минимум 1 клетка)
+    const otherPlaced = shipsRef.current.filter((s) => s.id !== ship.id && s.placed)
+    const isValid = canPlaceShip(ship, targetX, targetY, orientation, otherPlaced)
+
+    return {
+      x: targetX,
+      y: targetY,
+      orientation,
+      size: ship.size,
+      isValid,
+    }
+  }, [])
+
+  // Поворот корабля на поле при одиночном клике
+  const handleRotateShip = useCallback((ship) => {
+    const rot = findValidRotation(ship, shipsRef.current)
+    if (rot) {
+      setShips((prev) =>
+        prev.map((s) =>
+          s.id === ship.id
+            ? {
+                ...s,
+                x: rot.x,
+                y: rot.y,
+                orientation: rot.orientation,
+              }
+            : s
+        )
+      )
+    }
+  }, [])
+
+  // Начало перетаскивания или клика
+  const handleStartDrag = useCallback(
+    (e, ship, fromBoard) => {
+      // Только левая кнопка мыши или тач
+      if (e.button !== undefined && e.button !== 0) return
+
+      // Предотвращаем выделение текста на странице
+      e.preventDefault()
+
+      const segEl = e.target.closest('[data-segment]')
+      let segIndex = 0
+      if (segEl) {
+        segIndex = parseInt(segEl.getAttribute('data-segment'), 10) || 0
+      }
+
+      const startX = e.clientX
+      const startY = e.clientY
+      let isDragging = false
+
+      dragRef.current = {
+        ship,
+        fromBoard,
+        segIndex,
+        orientation: fromBoard ? ship.orientation : false,
+        startX,
+        startY,
+        currentPos: { x: startX, y: startY },
+        candidate: null,
+      }
+
+      const onPointerMove = (moveEvent) => {
+        const drag = dragRef.current
+        if (!drag) return
+
+        moveEvent.preventDefault()
+
+        const dist = Math.hypot(moveEvent.clientX - drag.startX, moveEvent.clientY - drag.startY)
+        if (!isDragging && dist > 5) {
+          isDragging = true
+          document.body.classList.add('is-dragging')
+          // Снимаем корабль с поля на время переноса
+          if (drag.fromBoard) {
+            setShips((prev) =>
+              prev.map((s) => (s.id === drag.ship.id ? { ...s, placed: false } : s))
+            )
+          }
+        }
+
+        if (isDragging) {
+          const currentPos = { x: moveEvent.clientX, y: moveEvent.clientY }
+          const candidate = computeGridCandidate(
+            drag.ship,
+            currentPos,
+            drag.orientation,
+            drag.segIndex
+          )
+          drag.currentPos = currentPos
+          drag.candidate = candidate
+
+          setActiveDrag({
+            ship: drag.ship,
+            orientation: drag.orientation,
+            currentPos,
+            segIndex: drag.segIndex,
+            candidate,
+          })
+        }
+      }
+
+      const onPointerUp = () => {
+        window.removeEventListener('pointermove', onPointerMove)
+        window.removeEventListener('pointerup', onPointerUp)
+        window.removeEventListener('keydown', onKeyDown)
+        document.body.classList.remove('is-dragging')
+
+        const drag = dragRef.current
+        dragRef.current = null
+        setActiveDrag(null)
+
+        if (!drag) return
+
+        if (!isDragging) {
+          // Одиночный клик
+          if (drag.fromBoard) {
+            handleRotateShip(drag.ship)
+          }
+          return
+        }
+
+        // Завершение перетаскивания
+        if (drag.candidate && drag.candidate.isValid) {
+          // Успешная установка на поле
+          setShips((prev) =>
+            prev.map((s) =>
+              s.id === drag.ship.id
+                ? {
+                    ...s,
+                    placed: true,
+                    x: drag.candidate.x,
+                    y: drag.candidate.y,
+                    orientation: drag.candidate.orientation,
+                  }
+                : s
+            )
+          )
+        } else {
+          // Некорректная позиция или за пределами поля -> возвращается в инвентарь
+          setShips((prev) =>
+            prev.map((s) =>
+              s.id === drag.ship.id
+                ? {
+                    ...s,
+                    placed: false,
+                    x: 0,
+                    y: 0,
+                    orientation: false,
+                  }
+                : s
+            )
+          )
+        }
+      }
+
+      const onKeyDown = (keyEvent) => {
+        if (keyEvent.code === 'Space' || keyEvent.key === 'r' || keyEvent.key === 'R') {
+          keyEvent.preventDefault()
+          const drag = dragRef.current
+          if (!drag) return
+          drag.orientation = !drag.orientation
+          const candidate = computeGridCandidate(
+            drag.ship,
+            drag.currentPos,
+            drag.orientation,
+            drag.segIndex
+          )
+          drag.candidate = candidate
+          setActiveDrag((prev) =>
+            prev ? { ...prev, orientation: drag.orientation, candidate } : null
+          )
+        }
+      }
+
+      window.addEventListener('pointermove', onPointerMove)
+      window.addEventListener('pointerup', onPointerUp)
+      window.addEventListener('keydown', onKeyDown)
+    },
+    [computeGridCandidate, handleRotateShip]
+  )
+
+  // Очистить сетку
+  const handleClear = useCallback(() => {
+    setShips(createInitialShips())
+  }, [])
+
+  // Случайная расстановка с backtracking
+  const handleRandom = useCallback(() => {
+    const placed = generateRandomPlacement()
+    setShips(placed)
+  }, [])
+
+  // 4 строчки инвентаря по возрастанию размера:
+  // Строка 1: 4 однопалубных (id 0..3)
+  // Строка 2: 3 двухпалубных (id 4..6)
+  // Строка 3: 2 трехпалубных (id 7..8)
+  // Строка 4: 1 четырехпалубный (id 9)
+  const inventoryRows = [
+    ships.filter((s) => s.size === 1),
+    ships.filter((s) => s.size === 2),
+    ships.filter((s) => s.size === 3),
+    ships.filter((s) => s.size === 4),
+  ]
+
+  return (
+    <div className="placement-screen-layout">
+      {opponentReady && (
+        <div className="placement-opponent-badge">
+          Соперник готов к бою!
+        </div>
+      )}
+
+      <div className="placement-container">
+        {/* Левая половина: игровое поле 10x10 с линейками и кнопками под ним */}
+        <div className="placement-left">
+          <SeaBoard
+            ships={ships}
+            preview={activeDrag?.candidate}
+            onShipPointerDown={(e, ship) => handleStartDrag(e, ship, true)}
+            gridRef={gridRef}
+          />
+
+          <div className="placement-board-actions">
+            <button
+              type="button"
+              className="btn btn-secondary ship-action-btn"
+              onClick={handleClear}
+              disabled={placedCount === 0 || isSubmitting}
+            >
+              Очистить поле
+            </button>
+            <button
+              type="button"
+              className="btn btn-secondary ship-action-btn ship-auto-btn"
+              title="Случайная расстановка (Авто)"
+              onClick={handleRandom}
+              disabled={isSubmitting}
+            >
+              <ShuffleIcon size={20} />
+              <span>Авто</span>
+            </button>
+          </div>
+        </div>
+
+        {/* Правая половина: инвентарь кораблей в 4 строки и кнопка Готово */}
+        <div className="placement-right">
+          <div className="ship-inventory">
+            <div className="inventory-header">
+              <span className="inventory-title">Корабли</span>
+              <span className="inventory-hint">
+                {allPlaced ? 'Все корабли на поле' : `Расставлено: ${placedCount} из 10`}
+              </span>
+            </div>
+
+            <div className="inventory-rows">
+              {inventoryRows.map((row, rowIndex) => (
+                <div key={rowIndex} className="inventory-row">
+                  {row.map((ship) => {
+                    const slotWidth = ship.size * 30 + (ship.size - 1) * 3
+                    return (
+                      <div
+                        key={ship.id}
+                        className="inventory-slot"
+                        style={{
+                          width: `${slotWidth}px`,
+                          height: '30px',
+                        }}
+                      >
+                        {!ship.placed && (
+                          <div
+                            className="board-ship horizontal in-inventory"
+                            onPointerDown={(e) => handleStartDrag(e, ship, false)}
+                          >
+                            {Array.from({ length: ship.size }).map((_, segIdx) => (
+                              <div
+                                key={segIdx}
+                                className="ship-segment"
+                                data-segment={segIdx}
+                              />
+                            ))}
+                          </div>
+                        )}
+                      </div>
+                    )
+                  })}
+                </div>
+              ))}
+            </div>
+          </div>
+
+          {/* Подсказка по повороту кораблей */}
+          <div className="placement-hint">
+            <span className="placement-hint-icon" aria-hidden="true">💡</span>
+            <span className="placement-hint-text">
+              Корабли можно поворачивать во время перетаскивания (клавиши <strong>Пробел</strong> или <strong>R</strong>), а также одиночным нажатием после перетаскивания.
+            </span>
+          </div>
+
+          <div className="placement-ready-wrapper">
+            <button
+              type="button"
+              className="btn btn-big ready-btn"
+              disabled={!allPlaced || isSubmitting}
+              onClick={() => onReady(ships)}
+            >
+              Готово
+            </button>
+          </div>
+        </div>
+      </div>
+
+      {/* Парящий под курсором корабль при перетаскивании */}
+      {activeDrag && (
+        <div
+          className={`floating-drag-ship ${
+            activeDrag.orientation ? 'vertical' : 'horizontal'
+          }`}
+          style={{
+            left: `${
+              activeDrag.currentPos.x -
+              (!activeDrag.orientation ? activeDrag.segIndex * 33 + 15 : 15)
+            }px`,
+            top: `${
+              activeDrag.currentPos.y -
+              (activeDrag.orientation ? activeDrag.segIndex * 33 + 15 : 15)
+            }px`,
+            width: `${
+              !activeDrag.orientation
+                ? activeDrag.ship.size * 30 + (activeDrag.ship.size - 1) * 3
+                : 30
+            }px`,
+            height: `${
+              activeDrag.orientation
+                ? activeDrag.ship.size * 30 + (activeDrag.ship.size - 1) * 3
+                : 30
+            }px`,
+          }}
+        >
+          {Array.from({ length: activeDrag.ship.size }).map((_, segIdx) => (
+            <div key={segIdx} className="ship-segment" />
+          ))}
+        </div>
+      )}
+    </div>
+  )
+}
diff --git a/frontend/src/game.js b/frontend/src/game.js
index 6aaa35f..89baa4d 100644
--- a/frontend/src/game.js
+++ b/frontend/src/game.js
@@ -6,10 +6,18 @@ export class GameConnectionError extends Error {
 }
 
 // Опкоды протокола game-server
-const OP_JOIN = 1
-const OP_END = 2
-const OP_STATE = 3
-const OP_ACK = 4
+export const OP_JOIN = 1
+export const OP_END = 2
+export const OP_STATE = 3
+export const OP_ACK = 4
+export const OP_PLACE_SHIPS = 5
+
+// Коды состояний протокола game-server
+export const STATE_PLACING_SHIPS = 1 // оба игрока расставляют корабли
+export const STATE_OPPONENT_READY = 2 // соперник готов
+export const STATE_WAIT_OPPONENT_READY = 3 // ожидайте готовности соперника
+export const STATE_YOUR_TURN = 4 // ваш ход
+export const STATE_WAIT_OPPONENT_TURN = 5 // ожидайте ход соперника
 
 const CLOSE_REASONS = {
   4000: 'Соединение заменено новым',
@@ -31,6 +39,8 @@ export function createGameConnection({ gameServerUrl, gameToken, userToken }) {
   let settled = false
   let lastSeq = 0
 
+  let connection = null
+
   const promise = new Promise((resolve, reject) => {
     const fail = (err) => {
       if (settled) return
@@ -39,19 +49,32 @@ export function createGameConnection({ gameServerUrl, gameToken, userToken }) {
       reject(err)
     }
 
-    const succeed = (connection) => {
+    const succeed = (conn) => {
       if (settled) return
       settled = true
-      resolve(connection)
-      // Сокет НЕ закрываем — соединение переиспользуется для игры
-      ws.onerror = null
-      ws.onclose = (event) => {
-        if (connection.onClose) connection.onClose(event.code)
-      }
+      resolve(conn)
     }
 
     ws = new WebSocket(gameServerUrl)
 
+    connection = {
+      socket: ws,
+      send: sendMessage,
+      placeShips(ships) {
+        // Сортируем строго по возрастанию размера: 4x1, 3x2, 2x3, 1x4
+        const sorted = [...ships].sort((a, b) => a.size - b.size)
+        const payload = [OP_PLACE_SHIPS]
+        for (const s of sorted) {
+          payload.push(Boolean(s.orientation), Number(s.x), Number(s.y))
+        }
+        sendMessage(payload)
+      },
+      onState: null,
+      onEnd: null,
+      onClose: null,
+      onError: null,
+    }
+
     ws.onopen = () => {
       ws.send(JSON.stringify([OP_JOIN, gameToken, userToken]))
     }
@@ -73,18 +96,29 @@ export function createGameConnection({ gameServerUrl, gameToken, userToken }) {
 
       if (opcode === OP_STATE) {
         const state = msg[2]
-        if (state === 1) {
-          succeed({ socket: ws, send: sendMessage })
+        if (!settled && state === STATE_PLACING_SHIPS) {
+          succeed(connection)
+        }
+        if (connection && typeof connection.onState === 'function') {
+          connection.onState(state)
         }
       } else if (opcode === OP_END) {
         const code = msg[2]
         const reason = msg[3] || 'Партия завершена'
-        fail(new GameConnectionError(code === -1 ? 'join_timeout' : 'closed', reason))
+        if (!settled) {
+          fail(new GameConnectionError(code === -1 ? 'join_timeout' : 'closed', reason))
+        } else if (connection && typeof connection.onEnd === 'function') {
+          connection.onEnd(code, reason)
+        }
       }
     }
 
-    ws.onerror = () => {
-      if (!settled) fail(new GameConnectionError('connection', 'Сетевая ошибка'))
+    ws.onerror = (err) => {
+      if (!settled) {
+        fail(new GameConnectionError('connection', 'Сетевая ошибка'))
+      } else if (connection && typeof connection.onError === 'function') {
+        connection.onError(err)
+      }
     }
 
     ws.onclose = (event) => {
@@ -93,6 +127,8 @@ export function createGameConnection({ gameServerUrl, gameToken, userToken }) {
           CLOSE_REASONS[event.code] ||
           (event.code === 1000 ? 'Соединение закрыто' : 'Соединение прервано')
         fail(new GameConnectionError('closed', message))
+      } else if (connection && typeof connection.onClose === 'function') {
+        connection.onClose(event.code)
       }
     }
   })
diff --git a/frontend/src/shipLogic.js b/frontend/src/shipLogic.js
new file mode 100644
index 0000000..76fa131
--- /dev/null
+++ b/frontend/src/shipLogic.js
@@ -0,0 +1,226 @@
+// Размеры 10 кораблей по возрастанию размера:
+// 4 однопалубных, 3 двухпалубных, 2 трехпалубных, 1 четырехпалубный
+export const SHIP_CONFIGS = [
+  { id: 0, size: 1 },
+  { id: 1, size: 1 },
+  { id: 2, size: 1 },
+  { id: 3, size: 1 },
+  { id: 4, size: 2 },
+  { id: 5, size: 2 },
+  { id: 6, size: 2 },
+  { id: 7, size: 3 },
+  { id: 8, size: 3 },
+  { id: 9, size: 4 },
+]
+
+export const ROW_LETTERS = ['А', 'Б', 'В', 'Г', 'Д', 'Е', 'Ж', 'З', 'И', 'К']
+export const COL_NUMBERS = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+
+/**
+ * Создает начальное состояние кораблей (все в инвентаре, горизонтальные).
+ */
+export function createInitialShips() {
+  return SHIP_CONFIGS.map((cfg) => ({
+    id: cfg.id,
+    size: cfg.size,
+    placed: false,
+    x: 0,
+    y: 0,
+    orientation: false, // false = горизонтально, true = вертикально
+  }))
+}
+
+/**
+ * Возвращает массив клеток { x, y }, занимаемых кораблем.
+ */
+export function getShipCells(ship) {
+  const cells = []
+  for (let i = 0; i < ship.size; i++) {
+    cells.push({
+      x: ship.orientation ? ship.x : ship.x + i,
+      y: ship.orientation ? ship.y + i : ship.y,
+    })
+  }
+  return cells
+}
+
+/**
+ * Проверяет, соприкасаются ли или перекрываются ли два корабля.
+ * Корабли не должны соприкасаться сторонами или углами (зазор минимум 1 клетка).
+ */
+export function shipsCollideOrTouch(s1, s2) {
+  const cells1 = getShipCells(s1)
+  const cells2 = getShipCells(s2)
+  for (const c1 of cells1) {
+    for (const c2 of cells2) {
+      if (Math.abs(c1.x - c2.x) <= 1 && Math.abs(c1.y - c2.y) <= 1) {
+        return true
+      }
+    }
+  }
+  return false
+}
+
+/**
+ * Проверяет, можно ли поставить корабль в позицию (x, y) с заданной ориентацией
+ * среди массива уже расставленных кораблей placedShips.
+ */
+export function canPlaceShip(ship, x, y, orientation, placedShips) {
+  const maxX = orientation ? x : x + ship.size - 1
+  const maxY = orientation ? y + ship.size - 1 : y
+
+  if (x < 0 || maxX >= 10 || y < 0 || maxY >= 10) {
+    return false
+  }
+
+  const testShip = { ...ship, x, y, orientation }
+
+  for (const other of placedShips) {
+    if (other.id === ship.id || !other.placed) continue
+    if (shipsCollideOrTouch(testShip, other)) {
+      return false
+    }
+  }
+
+  return true
+}
+
+/**
+ * Вычисляет список позиций-кандидатов для поворота корабля:
+ * При повороте корабль размера s, стоящий горизонтально в позиции (x, y),
+ * должен попытаться встать во все позиции, имеющие общую точку с позицией до поворота:
+ * (x + dx, y + dy), dx = 0...s-1, dy = -s+1...0.
+ * И аналогично для вертикального корабля:
+ * (x + dx, y + dy), dy = 0...s-1, dx = -s+1...0.
+ *
+ * Кандидаты сортируются: сначала без смещения (dx=0, dy=0),
+ * затем по возрастанию расстояния/сдвига от исходной клетки.
+ */
+export function getRotationCandidates(ship) {
+  const { size, orientation, x, y } = ship
+  const candidates = []
+
+  if (!orientation) {
+    // Текущий: горизонтальный -> поворачивается в вертикальный (orientation: true)
+    for (let dx = 0; dx < size; dx++) {
+      for (let dy = -size + 1; dy <= 0; dy++) {
+        candidates.push({
+          x: x + dx,
+          y: y + dy,
+          orientation: true,
+          dist: dx * dx + dy * dy,
+          absDist: Math.abs(dx) + Math.abs(dy),
+          dx,
+          dy,
+        })
+      }
+    }
+  } else {
+    // Текущий: вертикальный -> поворачивается в горизонтальный (orientation: false)
+    for (let dy = 0; dy < size; dy++) {
+      for (let dx = -size + 1; dx <= 0; dx++) {
+        candidates.push({
+          x: x + dx,
+          y: y + dy,
+          orientation: false,
+          dist: dx * dx + dy * dy,
+          absDist: Math.abs(dx) + Math.abs(dy),
+          dx,
+          dy,
+        })
+      }
+    }
+  }
+
+  // Приоритет: сначала dx=0, dy=0, затем по минимальному расстоянию
+  candidates.sort((a, b) => {
+    if (a.dist !== b.dist) return a.dist - b.dist
+    if (a.absDist !== b.absDist) return a.absDist - b.absDist
+    if (a.dx !== b.dx) return a.dx - b.dx
+    return a.dy - b.dy
+  })
+
+  return candidates
+}
+
+/**
+ * Находит первую подходящую позицию для поворота корабля.
+ * Если ни одна позиция не подходит — возвращает null (корабль не поворачивается).
+ */
+export function findValidRotation(ship, allShips) {
+  const candidates = getRotationCandidates(ship)
+  const otherPlacedShips = allShips.filter((s) => s.id !== ship.id && s.placed)
+
+  for (const cand of candidates) {
+    if (canPlaceShip(ship, cand.x, cand.y, cand.orientation, otherPlacedShips)) {
+      return {
+        x: cand.x,
+        y: cand.y,
+        orientation: cand.orientation,
+      }
+    }
+  }
+
+  return null
+}
+
+/**
+ * Генерирует случайную валидную расстановку всех 10 кораблей с помощью алгоритма с backtracking.
+ */
+export function generateRandomPlacement() {
+  // Начинаем с самых больших кораблей (размер 4, 3, 3, 2, 2, 2, 1, 1, 1, 1)
+  const sortedConfig = [...SHIP_CONFIGS].sort((a, b) => b.size - a.size)
+  const placed = []
+
+  function backtrack(index) {
+    if (index === sortedConfig.length) {
+      return true
+    }
+
+    const cfg = sortedConfig[index]
+    const candidates = []
+
+    for (let x = 0; x < 10; x++) {
+      for (let y = 0; y < 10; y++) {
+        for (const orientation of [false, true]) {
+          const testShip = { id: cfg.id, size: cfg.size, x, y, orientation, placed: true }
+          if (canPlaceShip(testShip, x, y, orientation, placed)) {
+            candidates.push({ x, y, orientation })
+          }
+        }
+      }
+    }
+
+    // Случайное перемешивание кандидатов (Fisher-Yates)
+    for (let i = candidates.length - 1; i > 0; i--) {
+      const j = Math.floor(Math.random() * (i + 1))
+      ;[candidates[i], candidates[j]] = [candidates[j], candidates[i]]
+    }
+
+    for (const cand of candidates) {
+      const newShip = {
+        id: cfg.id,
+        size: cfg.size,
+        placed: true,
+        x: cand.x,
+        y: cand.y,
+        orientation: cand.orientation,
+      }
+      placed.push(newShip)
+
+      if (backtrack(index + 1)) {
+        return true
+      }
+
+      placed.pop()
+    }
+
+    return false
+  }
+
+  backtrack(0)
+
+  // Возвращаем в исходном порядке по id 0..9
+  placed.sort((a, b) => a.id - b.id)
+  return placed
+}
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 39b9f3b..9b8eb32 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -510,3 +510,408 @@ input:not([type]), input[type="text"] {
     height: 58px;
   }
 }
+
+/* Экран расстановки кораблей */
+.game-screen-main {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding: 30px 20px 40px;
+}
+
+body.is-dragging,
+body.is-dragging * {
+  user-select: none !important;
+  -webkit-user-select: none !important;
+  cursor: grabbing !important;
+}
+
+.placement-screen-layout {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  width: 100%;
+  max-width: 900px;
+  user-select: none;
+  -webkit-user-select: none;
+}
+
+.placement-opponent-badge {
+  background: var(--primary-soft);
+  color: var(--primary-darker);
+  font-family: 'Comfortaa';
+  font-size: 15px;
+  font-weight: 700;
+  padding: 8px 18px;
+  border-radius: 20px;
+  margin-bottom: 20px;
+  box-shadow: 0 2px 8px rgba(47, 128, 237, 0.15);
+  animation: badge-pulse 2s infinite ease-in-out;
+}
+
+@keyframes badge-pulse {
+  0%, 100% {
+    transform: scale(1);
+  }
+  50% {
+    transform: scale(1.03);
+  }
+}
+
+.placement-container {
+  display: flex;
+  flex-direction: row;
+  justify-content: center;
+  align-items: flex-start;
+  gap: 50px;
+  width: 100%;
+}
+
+.placement-left {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+}
+
+.placement-right {
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  min-height: 400px;
+  min-width: 300px;
+}
+
+/* Игровое поле с линейками */
+.sea-board-wrapper {
+  display: inline-grid;
+  grid-template-columns: auto auto;
+  grid-template-rows: auto auto;
+  user-select: none;
+}
+
+.sea-board-corner {
+  grid-column: 1;
+  grid-row: 1;
+  width: 28px;
+  height: 28px;
+  margin-right: 8px;
+  margin-bottom: 8px;
+}
+
+.sea-board-col-ruler {
+  grid-column: 2;
+  grid-row: 1;
+  display: flex;
+  gap: 3px;
+  padding: 0 3px;
+  margin-bottom: 8px; /* небольшой отступ от самого поля */
+}
+
+.sea-board-row-ruler {
+  grid-column: 1;
+  grid-row: 2;
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+  padding: 3px 0;
+  margin-right: 8px; /* небольшой отступ от самого поля */
+}
+
+.sea-ruler-cell {
+  width: 30px;
+  height: 30px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-family: 'Comfortaa', sans-serif;
+  font-size: 15px;
+  font-weight: 700;
+  color: var(--text-soft);
+}
+
+.sea-grid-container {
+  grid-column: 2;
+  grid-row: 2;
+  position: relative;
+  width: 333px;
+  height: 333px;
+  box-shadow: 0 8px 24px rgba(30, 58, 95, 0.08);
+  border-radius: 4px;
+  overflow: visible;
+}
+
+.sea-ships-layer {
+  position: absolute;
+  inset: 0;
+  pointer-events: auto;
+}
+
+/* Корабли */
+.board-ship {
+  position: absolute;
+  display: flex;
+  gap: 3px;
+  z-index: 2;
+  cursor: grab;
+  touch-action: none;
+  transition: transform 0.08s ease;
+}
+
+.board-ship:active {
+  cursor: grabbing;
+}
+
+.board-ship.horizontal {
+  flex-direction: row;
+}
+
+.board-ship.vertical {
+  flex-direction: column;
+}
+
+.ship-segment {
+  width: 30px;
+  height: 30px;
+  background-color: var(--ship);
+  border-radius: 4px;
+  flex-shrink: 0;
+  box-sizing: border-box;
+}
+
+/* Закругление концов корабля */
+.board-ship.horizontal .ship-segment:first-child {
+  border-top-left-radius: 8px;
+  border-bottom-left-radius: 8px;
+}
+
+.board-ship.horizontal .ship-segment:last-child {
+  border-top-right-radius: 8px;
+  border-bottom-right-radius: 8px;
+}
+
+.board-ship.vertical .ship-segment:first-child {
+  border-top-left-radius: 8px;
+  border-top-right-radius: 8px;
+}
+
+.board-ship.vertical .ship-segment:last-child {
+  border-bottom-left-radius: 8px;
+  border-bottom-right-radius: 8px;
+}
+
+/* Корабль в инвентаре */
+.board-ship.in-inventory {
+  position: relative;
+  left: 0 !important;
+  top: 0 !important;
+  cursor: grab;
+}
+
+.board-ship.in-inventory:hover .ship-segment {
+  filter: brightness(1.15);
+}
+
+/* Призрак при переносе на сетке */
+.ghost-preview {
+  pointer-events: none;
+  z-index: 3;
+}
+
+.ghost-valid .ship-segment {
+  background-color: rgba(47, 128, 237, 0.6);
+  outline: 2px solid var(--primary);
+  outline-offset: -2px;
+}
+
+.ghost-invalid .ship-segment {
+  background-color: rgba(224, 72, 62, 0.65);
+  outline: 2px solid var(--danger);
+  outline-offset: -2px;
+}
+
+/* Парящий под курсором корабль */
+.floating-drag-ship {
+  position: fixed;
+  display: flex;
+  gap: 3px;
+  pointer-events: none;
+  z-index: 9999;
+  opacity: 0.92;
+  filter: drop-shadow(0 8px 18px rgba(29, 58, 95, 0.35));
+  transform: scale(1.04);
+}
+
+.floating-drag-ship.horizontal {
+  flex-direction: row;
+}
+
+.floating-drag-ship.vertical {
+  flex-direction: column;
+}
+
+.floating-drag-ship .ship-segment {
+  background-color: var(--ship);
+}
+
+.floating-drag-ship.horizontal .ship-segment:first-child {
+  border-top-left-radius: 8px;
+  border-bottom-left-radius: 8px;
+}
+
+.floating-drag-ship.horizontal .ship-segment:last-child {
+  border-top-right-radius: 8px;
+  border-bottom-right-radius: 8px;
+}
+
+.floating-drag-ship.vertical .ship-segment:first-child {
+  border-top-left-radius: 8px;
+  border-top-right-radius: 8px;
+}
+
+.floating-drag-ship.vertical .ship-segment:last-child {
+  border-bottom-left-radius: 8px;
+  border-bottom-right-radius: 8px;
+}
+
+/* Кнопки под полем */
+.placement-board-actions {
+  display: flex;
+  gap: 12px;
+  margin-top: 18px;
+  width: 100%;
+  justify-content: center;
+}
+
+.ship-action-btn {
+  padding: 10px 18px;
+  font-size: 15px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  border-radius: 12px;
+}
+
+.ship-auto-btn {
+  color: var(--primary);
+}
+
+/* Инвентарь */
+.ship-inventory {
+  background: rgba(255, 255, 255, 0.65);
+  backdrop-filter: blur(8px);
+  border: 1px solid rgba(47, 128, 237, 0.15);
+  border-radius: 18px;
+  padding: 18px 22px;
+  box-shadow: 0 8px 24px rgba(30, 58, 95, 0.05);
+}
+
+.inventory-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: baseline;
+  margin-bottom: 16px;
+}
+
+.inventory-title {
+  font-family: 'Comfortaa', sans-serif;
+  font-weight: 700;
+  font-size: 19px;
+  color: var(--text);
+}
+
+.inventory-hint {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-soft);
+}
+
+.inventory-rows {
+  display: flex;
+  flex-direction: column;
+  gap: 14px;
+}
+
+.inventory-row {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  min-height: 30px;
+}
+
+.inventory-slot {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  height: 30px;
+  background: transparent;
+}
+
+/* Текстовая подсказка */
+.placement-hint {
+  display: flex;
+  align-items: flex-start;
+  gap: 10px;
+  background: rgba(255, 255, 255, 0.65);
+  border: 1px solid rgba(47, 128, 237, 0.2);
+  border-radius: 14px;
+  padding: 12px 14px;
+  margin-top: 14px;
+  box-shadow: 0 4px 14px rgba(30, 58, 95, 0.04);
+  backdrop-filter: blur(8px);
+}
+
+.placement-hint-icon {
+  font-size: 18px;
+  line-height: 1.2;
+  flex-shrink: 0;
+}
+
+.placement-hint-text {
+  font-size: 14px;
+  line-height: 1.4;
+  color: var(--text-soft);
+}
+
+.placement-hint-text strong {
+  color: var(--primary-darker);
+  font-weight: 700;
+}
+
+/* Кнопка Готово */
+.placement-ready-wrapper {
+  margin-top: 24px;
+  display: flex;
+  justify-content: flex-end;
+}
+
+.ready-btn {
+  min-width: 170px;
+  font-size: 20px;
+  padding: 14px 28px;
+}
+
+.loading-modal {
+  text-align: center;
+  align-items: center;
+}
+
+@media (max-width: 780px) {
+  .placement-container {
+    flex-direction: column;
+    align-items: center;
+    gap: 28px;
+  }
+
+  .placement-right {
+    min-width: auto;
+    width: 100%;
+    max-width: 360px;
+  }
+
+  .placement-ready-wrapper {
+    justify-content: center;
+  }
+}