"use client";

import createGlobe, { COBEOptions } from "cobe";
import { useMotionValue, useSpring } from "motion/react";
import { useEffect, useRef } from "react";

import { cn } from "@/lib/utils";

const MOVEMENT_DAMPING = 1400;

const GLOBE_CONFIG: COBEOptions = {
  width: 800,
  height: 800,
  onRender: () => {},
  devicePixelRatio: 2,
  phi: 0,
  theta: 0.3,
  dark: 0,
  diffuse: 0.25, // softer shading for premium look
  mapSamples: 16000,
  mapBrightness: 1.1,
  baseColor: [0.8, 0.8, 0.8], // sleek dark gray globe
  markerColor: [0.3, 0.6, 1], // soft, elegant blue
  glowColor: [0.8, 0.8, 0.85], // subtle glow
  markers: [
    // --- Core Global Markers ---
    { location: [14.5995, 120.9842], size: 0.03 }, // Manila
    { location: [19.076, 72.8777], size: 0.1 }, // Mumbai
    { location: [23.8103, 90.4125], size: 0.05 }, // Dhaka
    { location: [30.0444, 31.2357], size: 0.07 }, // Cairo
    { location: [39.9042, 116.4074], size: 0.08 }, // Beijing
    { location: [-23.5505, -46.6333], size: 0.1 }, // São Paulo
    { location: [19.4326, -99.1332], size: 0.1 }, // Mexico City
    { location: [40.7128, -74.006], size: 0.1 }, // New York
    { location: [34.6937, 135.5022], size: 0.05 }, // Osaka
    { location: [41.0082, 28.9784], size: 0.06 }, // Istanbul
    { location: [48.8566, 2.3522], size: 0.08 }, // Paris
    { location: [51.5072, -0.1276], size: 0.08 }, // London
    { location: [52.52, 13.405], size: 0.07 }, // Berlin
    { location: [35.6895, 139.6917], size: 0.06 }, // Tokyo
    { location: [-33.8688, 151.2093], size: 0.06 }, // Sydney
    { location: [-1.2921, 36.8219], size: 0.05 }, // Nairobi
    { location: [-34.6037, -58.3816], size: 0.07 }, // Buenos Aires
    { location: [37.7749, -122.4194], size: 0.08 }, // San Francisco
    { location: [1.3521, 103.8198], size: 0.06 }, // Singapore
    { location: [28.6139, 77.2090], size: 0.08 }, // New Delhi
    { location: [13.7563, 100.5018], size: 0.06 }, // Bangkok
    { location: [59.9343, 30.3351], size: 0.05 }, // St. Petersburg
    { location: [33.6844, 73.0479], size: 0.05 }, // Islamabad
    { location: [25.276987, 55.296249], size: 0.07 }, // Dubai
    { location: [60.1699, 24.9384], size: 0.05 }, // Helsinki
    { location: [43.6532, -79.3832], size: 0.07 }, // Toronto
    { location: [6.5244, 3.3792], size: 0.08 }, // Lagos
    { location: [50.1109, 8.6821], size: 0.06 }, // Frankfurt

    // --- 12 New US + European Cities ---
    { location: [34.0522, -118.2437], size: 0.08 }, // Los Angeles
    { location: [41.8781, -87.6298], size: 0.07 }, // Chicago
    { location: [29.7604, -95.3698], size: 0.07 }, // Houston
    { location: [25.7617, -80.1918], size: 0.07 }, // Miami
    { location: [45.5017, -73.5673], size: 0.06 }, // Montreal
    { location: [47.6062, -122.3321], size: 0.06 }, // Seattle
    { location: [40.4406, -79.9959], size: 0.05 }, // Pittsburgh
    { location: [41.3851, 2.1734], size: 0.06 }, // Barcelona
    { location: [45.4642, 9.19], size: 0.06 }, // Milan
    { location: [52.3676, 4.9041], size: 0.06 }, // Amsterdam
    { location: [38.7169, -9.139], size: 0.05 }, // Lisbon
    { location: [59.3293, 18.0686], size: 0.05 }, // Stockholmx
  ],
};

export function Globe({
  className,
  config = GLOBE_CONFIG,
}: {
  className?: string;
  config?: COBEOptions;
}) {
  let phi = 0;
  let width = 0;
  const canvasRef = useRef<HTMLCanvasElement>(null);
  const pointerInteracting = useRef<number | null>(null);

  const r = useMotionValue(0);
  const rs = useSpring(r, {
    mass: 1,
    damping: 35, // slightly smoother motion
    stiffness: 100,
  });

  const updatePointerInteraction = (value: number | null) => {
    pointerInteracting.current = value;
    if (canvasRef.current) {
      canvasRef.current.style.cursor = value !== null ? "grabbing" : "grab";
    }
  };

  const updateMovement = (clientX: number) => {
    if (pointerInteracting.current !== null) {
      const delta = clientX - pointerInteracting.current;
      r.set(r.get() + delta / MOVEMENT_DAMPING);
    }
  };

  useEffect(() => {
    const onResize = () => {
      if (canvasRef.current) width = canvasRef.current.offsetWidth;
    };

    window.addEventListener("resize", onResize);
    onResize();

    const globe = createGlobe(canvasRef.current!, {
      ...config,
      width: width * 2,
      height: width * 2,
      onRender: (state) => {
        if (!pointerInteracting.current) phi += 0.004; // slightly slower rotation for elegance
        state.phi = phi + rs.get();
        state.width = width * 2;
        state.height = width * 2;
      },
    });

    setTimeout(() => (canvasRef.current!.style.opacity = "1"), 0);
    return () => {
      globe.destroy();
      window.removeEventListener("resize", onResize);
    };
  }, [rs, config]);

  return (
    <div
      className={cn(
        // Radial gradient background that fades to pure black at edges
        "absolute inset-0 mx-auto aspect-[1/1] w-full max-w-[600px] rounded-full",
        className,
      )}
    >
      <canvas
        className={cn(
          "size-full opacity-0 transition-opacity duration-500 [contain:layout_paint_size]",
        )}
        ref={canvasRef}
        onPointerDown={(e) => {
          pointerInteracting.current = e.clientX;
          updatePointerInteraction(e.clientX);
        }}
        onPointerUp={() => updatePointerInteraction(null)}
        onPointerOut={() => updatePointerInteraction(null)}
        onMouseMove={(e) => updateMovement(e.clientX)}
        onTouchMove={(e) =>
          e.touches[0] && updateMovement(e.touches[0].clientX)
        }
      />
    </div>
  );
}