import React, { useState } from "react";
import { motion } from "framer-motion";

const fleet = [
  { name: "carrier", size: 5 },
  { name: "battleship", size: 4 },
  { name: "cruiser", size: 3 },
  { name: "submarine", size: 3 },
  { name: "destroyer", size: 2 },
];

interface PlacementProps {
  myIndex: number;
  boards: Record<string, { grid: string[][] }>;
  metadata: Record<string, any>;
  onPlace: (ship: string, row: number, col: number, dir: string) => void;
  players: any[];
}

export default function PlacementPhase({
  myIndex,
  boards,
  metadata,
  onPlace,
}: PlacementProps) {
  const shipBoard = boards[`p${myIndex}_ships`]?.grid;
  const placedCount = metadata[`p${myIndex}_placed`] ?? 0;

  const [selectedShip, setSelectedShip] = useState<string | null>(null);
  const [orientation, setOrientation] = useState<"h" | "v">("h");
  const [hoverPos, setHoverPos] = useState<[number, number] | null>(null);

  if (!shipBoard) return <div>Loading...</div>;

  const remainingShips = fleet.slice(placedCount);

  const current = remainingShips[0];
  const shipName = current?.name ?? null;
  const shipSize = current?.size ?? 0;

  const canPlace = (r: number, c: number) => {
    if (!shipName) return false;

    // bounds
    if (orientation === "h") {
      if (c + shipSize > shipBoard[0].length) return false;
      for (let i = 0; i < shipSize; i++) {
        if (shipBoard[r][c + i] !== "") return false;
      }
    } else {
      if (r + shipSize > shipBoard.length) return false;
      for (let i = 0; i < shipSize; i++) {
        if (shipBoard[r + i][c] !== "") return false;
      }
    }
    return true;
  };

  const renderCell = (cell: string, r: number, c: number) => {
    const hovered = hoverPos?.[0] === r && hoverPos?.[1] === c;
    const placing = hovered && shipName;

    let previewColor = "transparent";

    if (placing) {
      const valid = canPlace(r, c);
      previewColor = valid ? "rgba(46, 204, 113, 0.4)" : "rgba(231, 76, 60, 0.4)";
    }

    return (
      <motion.div
        key={`${r}-${c}`}
        onMouseEnter={() => setHoverPos([r, c])}
        onMouseLeave={() => setHoverPos(null)}
        onClick={() => {
          if (shipName && canPlace(r, c)) {
            onPlace(shipName, r, c, orientation);
          }
        }}
        whileHover={{ scale: 1.03 }}
        style={{
          width: 40,
          height: 40,
          border: "1px solid #333",
          background: cell === "S" ? "#2980b9" : previewColor,
          cursor: shipName ? "pointer" : "default",
        }}
      />
    );
  };

  return (
    <motion.div
      initial={{ opacity: 0, y: 6 }}
      animate={{ opacity: 1, y: 0 }}
      transition={{ duration: 0.3 }}
      style={{ textAlign: "center" }}
    >
      <h2 style={{ marginBottom: 10 }}>Place Your Fleet</h2>

      {shipName ? (
        <div style={{ marginBottom: 12 }}>
          <strong>Placing:</strong> {shipName} ({shipSize})
        </div>
      ) : (
        <div style={{ marginBottom: 12, color: "#2ecc71" }}>
          ✅ All ships placed — waiting for opponent...
        </div>
      )}

      {shipName && (
        <div style={{ marginBottom: 12 }}>
          <button
            onClick={() => setOrientation(orientation === "h" ? "v" : "h")}
            style={{
              padding: "8px 14px",
              background: "#111",
              border: "1px solid #666",
              borderRadius: 6,
              color: "white",
            }}
          >
            Orientation: {orientation === "h" ? "Horizontal" : "Vertical"}
          </button>
        </div>
      )}

      {/* BOARD GRID */}
      <motion.div
        layout
        style={{
          display: "grid",
          gridTemplateColumns: `repeat(${shipBoard[0].length}, 40px)`,
          gap: 4,
          justifyContent: "center",
          marginTop: 20,
        }}
      >
        {shipBoard.map((row, r) =>
          row.map((cell, c) => renderCell(cell, r, c))
        )}
      </motion.div>
    </motion.div>
  );
}