"use client";

import { useState, useCallback } from "react";
import { ChevronUp, ChevronDown, ChevronLeft, ChevronRight, Circle, X, Video } from "lucide-react";

type Direction = "up" | "down" | "left" | "right" | "front";

// --- Shared D-Pad + Camera Image ---

interface CameraFeedProps {
  base64: string;
}

/**
 * Pure camera feed with D-pad controls — no positioning wrapper.
 * Used by DashboardGrid's bento flip and can be embedded anywhere.
 */
export function CameraFeed({ base64 }: CameraFeedProps) {
  const [isMoving, setIsMoving] = useState(false);
  const [lastDirection, setLastDirection] = useState<Direction | null>(null);

  const moveHead = useCallback(async (direction: Direction) => {
    if (isMoving) return;
    
    setIsMoving(true);
    setLastDirection(direction);
    
    try {
      const response = await fetch("http://localhost:7860/api/move-head", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ direction }),
      });
      
      if (!response.ok) {
        console.error("Move head failed:", await response.text());
      }
    } catch (error) {
      console.error("Move head error:", error);
    } finally {
      setTimeout(() => {
        setIsMoving(false);
        setLastDirection(null);
      }, 300);
    }
  }, [isMoving]);

  return (
    <div className="relative w-full h-full flex flex-col" style={{
      background: 'linear-gradient(135deg, rgba(54,54,54,0.8) 0%, rgba(36,36,36,0.9) 100%)',
    }}>
      {/* Header bar — muted, consistent with bento cards */}
      <div className="flex items-center gap-2 px-4 py-2.5" style={{
        borderBottom: '1px solid rgba(255,255,255,0.1)',
      }}>
        <Video className="w-3.5 h-3.5 text-gray-400" />
        <span className="text-[10px] font-semibold text-gray-400 tracking-widest uppercase">Live View</span>
        <span className="w-1.5 h-1.5 rounded-full bg-red-400 animate-pulse ml-auto" />
      </div>

      {/* Video feed — fills remaining space */}
      <div className="relative flex-1 min-h-0">
        <img
          src={`data:image/jpeg;base64,${base64}`}
          alt="Robot camera view"
          className="w-full h-full object-cover"
        />
        
        {/* D-pad overlay */}
        <div className="absolute inset-0 flex items-center justify-center pointer-events-none">
          <div className="relative w-28 h-28 pointer-events-auto">
            <DPadButton
              direction="up"
              icon={<ChevronUp className="w-4 h-4" />}
              position="top-0 left-1/2 -translate-x-1/2"
              onClick={() => moveHead("up")}
              isActive={lastDirection === "up"}
              disabled={isMoving && lastDirection !== "up"}
            />
            <DPadButton
              direction="down"
              icon={<ChevronDown className="w-4 h-4" />}
              position="bottom-0 left-1/2 -translate-x-1/2"
              onClick={() => moveHead("down")}
              isActive={lastDirection === "down"}
              disabled={isMoving && lastDirection !== "down"}
            />
            <DPadButton
              direction="left"
              icon={<ChevronLeft className="w-4 h-4" />}
              position="left-0 top-1/2 -translate-y-1/2"
              onClick={() => moveHead("left")}
              isActive={lastDirection === "left"}
              disabled={isMoving && lastDirection !== "left"}
            />
            <DPadButton
              direction="right"
              icon={<ChevronRight className="w-4 h-4" />}
              position="right-0 top-1/2 -translate-y-1/2"
              onClick={() => moveHead("right")}
              isActive={lastDirection === "right"}
              disabled={isMoving && lastDirection !== "right"}
            />
            {/* Center button (front) */}
            <button
              onClick={() => moveHead("front")}
              disabled={isMoving && lastDirection !== "front"}
              className={`absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 w-8 h-8 rounded-full 
                ${lastDirection === "front" 
                  ? "bg-white/30 ring-2 ring-white/40" 
                  : "bg-white/10 hover:bg-white/20"
                } 
                backdrop-blur transition-all duration-150 flex items-center justify-center
                disabled:opacity-50`}
              aria-label="Center robot view"
            >
              <Circle className="w-3 h-3 text-white/70" />
            </button>
          </div>
        </div>
      </div>

      {/* Footer hint */}
      <div className="px-4 py-2 text-center" style={{
        borderTop: '1px solid rgba(255,255,255,0.06)',
      }}>
        <span className="text-[10px] text-gray-500">Tap arrows to move robot&apos;s view</span>
      </div>
    </div>
  );
}

// --- Legacy floating overlay (kept for backwards compat) ---

interface CameraViewProps {
  base64: string;
  onClose: () => void;
}

export function CameraView({ base64, onClose }: CameraViewProps) {
  return (
    <div className="absolute bottom-20 right-6 z-50 animate-in slide-in-from-right-4 duration-300">
      <div className="relative w-64 rounded-2xl overflow-hidden border border-white/20 shadow-2xl bg-black/80 backdrop-blur-xl">
        {/* Close button on the old overlay */}
        <div className="absolute top-2 right-2 z-10">
          <button
            onClick={onClose}
            className="p-1 rounded-full hover:bg-white/20 transition-colors bg-black/40"
            aria-label="Close camera view"
          >
            <X className="w-4 h-4 text-white" />
          </button>
        </div>
        <CameraFeed base64={base64} />
      </div>
    </div>
  );
}

// --- D-Pad Button ---

interface DPadButtonProps {
  direction: Direction;
  icon: React.ReactNode;
  position: string;
  onClick: () => void;
  isActive: boolean;
  disabled: boolean;
}

function DPadButton({ direction, icon, position, onClick, isActive, disabled }: DPadButtonProps) {
  return (
    <button
      onClick={onClick}
      disabled={disabled}
      className={`absolute ${position} w-7 h-7 rounded-lg 
        ${isActive 
          ? "bg-white/25 ring-2 ring-white/30 scale-110" 
          : "bg-white/10 hover:bg-white/20"
        }
        backdrop-blur transition-all duration-150 flex items-center justify-center
        disabled:opacity-50 focus:outline-none focus:ring-2 focus:ring-white/30`}
      aria-label={`Look ${direction}`}
    >
      <span className="text-white">{icon}</span>
    </button>
  );
}