import { useRef, useMemo } from 'react';
import * as THREE from 'three';
import { useFrame } from '@react-three/fiber';
import { DEVICE_POSITIONS, PV_ARRAY, COLORS } from '../constants';

interface PVPanelsProps {
  devices: Array<{ id: number; code: string; status: string; power?: number; rated_power?: number }>;
  hoveredId: number | null;
  onHover: (id: number | null) => void;
  onClick: (device: { id: number; code: string; status: string; power?: number; rated_power?: number }) => void;
  detailMode?: boolean;
}

const PV_ZONES = [
  { code: 'PV-INV-01', center: DEVICE_POSITIONS['PV-INV-01'].position },
  { code: 'PV-INV-02', center: DEVICE_POSITIONS['PV-INV-02'].position },
  { code: 'PV-INV-03', center: DEVICE_POSITIONS['PV-INV-03'].position },
] as const;

function PVZone({
  center,
  device,
  isHovered,
  onHover,
  onClick,
}: {
  center: readonly [number, number, number];
  device: { id: number; code: string; status: string; power?: number; rated_power?: number } | undefined;
  isHovered: boolean;
  onHover: (id: number | null) => void;
  onClick: (device: { id: number; code: string; status: string; power?: number; rated_power?: number }) => void;
}) {
  const groupRef = useRef<THREE.Group>(null);

  const panels = useMemo(() => {
    const items: { pos: [number, number, number] }[] = [];
    const { cols, rows, panelWidth, panelHeight, gap } = PV_ARRAY;
    const totalW = cols * panelWidth + (cols - 1) * gap;
    const totalD = rows * panelHeight + (rows - 1) * gap;

    for (let r = 0; r < rows; r++) {
      for (let c = 0; c < cols; c++) {
        const x = -totalW / 2 + panelWidth / 2 + c * (panelWidth + gap);
        const z = -totalD / 2 + panelHeight / 2 + r * (panelHeight + gap);
        items.push({ pos: [x, 0, z] });
      }
    }
    return items;
  }, []);

  const ratio = device && device.rated_power ? (device.power ?? 0) / device.rated_power : 0;
  const emissiveIntensity = Math.min(ratio * 0.5, 0.5);

  return (
    <group
      ref={groupRef}
      position={[center[0], center[1], center[2]]}
      onPointerOver={(e) => { e.stopPropagation(); if (device) onHover(device.id); }}
      onPointerOut={(e) => { e.stopPropagation(); onHover(null); }}
      onClick={(e) => { e.stopPropagation(); if (device) onClick(device); }}
    >
      {panels.map((p, i) => (
        <mesh
          key={i}
          position={p.pos}
          rotation={[-PV_ARRAY.tiltAngle, 0, 0]}
          castShadow
        >
          <boxGeometry args={[PV_ARRAY.panelWidth, PV_ARRAY.panelDepth, PV_ARRAY.panelHeight]} />
          <meshStandardMaterial
            color={isHovered ? '#2a347e' : '#1a237e'}
            metalness={0.8}
            roughness={0.3}
            emissive={COLORS.pvGreen}
            emissiveIntensity={isHovered ? 0.5 : emissiveIntensity}
          />
        </mesh>
      ))}
    </group>
  );
}

export default function PVPanels({ devices, hoveredId, onHover, onClick }: PVPanelsProps) {
  const deviceMap = useMemo(() => {
    const map = new Map<string, (typeof devices)[number]>();
    devices.forEach((d) => map.set(d.code, d));
    return map;
  }, [devices]);

  return (
    <group>
      {PV_ZONES.map((zone) => {
        const device = deviceMap.get(zone.code);
        return (
          <PVZone
            key={zone.code}
            center={zone.center}
            device={device}
            isHovered={device ? hoveredId === device.id : false}
            onHover={onHover}
            onClick={onClick}
          />
        );
      })}
    </group>
  );
}