"use client";

import { useState, useEffect, useRef, useCallback } from "react";

const SCREENS = [
  { label: "🏡 Home", key: "home" },
  { label: "💉 Vaccinations", key: "vaccines" },
  { label: "📸 Memories", key: "memories" },
] as const;

// ── Screen 0: Home / Quick Log ──────────────────────────────────
function HomeScreen() {
  return (
    <div className="w-full h-full bg-gradient-to-br from-rose-50 to-amber-50 flex flex-col overflow-hidden text-[10px]">
      {/* Status bar */}
      <div className="flex items-center justify-between px-4 pt-3 pb-1">
        <span className="font-semibold text-gray-600 text-[9px]">9:41</span>
        <div className="flex items-center gap-1 text-gray-500 text-[9px]">
          <span>●●●</span>
          <span>WiFi</span>
          <span>🔋</span>
        </div>
      </div>

      {/* Top nav */}
      <div className="flex items-center justify-between px-3 pb-1">
        <div className="w-6 h-5 flex flex-col justify-between py-0.5">
          {[0,1,2].map(i => <div key={i} className="h-0.5 w-4 bg-gray-500 rounded" />)}
        </div>
        <div className="flex items-center gap-2 text-[11px]">
          <span>☀️</span>
          <span className="text-red-500 font-bold text-[10px]">🆘</span>
        </div>
      </div>

      {/* Greeting */}
      <div className="px-3 pb-2">
        <p className="font-bold text-[13px] text-gray-900">Good morning 👋</p>
        <p className="text-gray-500 text-[9px]">How is Arjun doing today?</p>
      </div>

      {/* Baby card */}
      <div className="mx-3 mb-2 bg-white rounded-2xl shadow-sm px-3 py-2 flex items-center gap-3">
        <div className="w-10 h-10 bg-rose-100 rounded-full flex items-center justify-center text-lg flex-shrink-0">
          👶
        </div>
        <div className="flex-1">
          <p className="font-semibold text-gray-900 text-[11px]">Arjun</p>
          <p className="text-gray-500 text-[9px]">4 months</p>
        </div>
        <span className="text-gray-400 text-[11px]">→</span>
      </div>

      {/* Today summary */}
      <div className="mx-3 mb-2 bg-white rounded-2xl shadow-sm">
        <div className="grid grid-cols-3 divide-x divide-gray-100">
          {[
            { icon: "🍼", label: "Feeds",   count: 4, last: "2m ago" },
            { icon: "🚼", label: "Diapers", count: 3, last: "1h ago" },
            { icon: "😴", label: "Sleep",   count: 1, last: "3h ago" },
          ].map(item => (
            <div key={item.label} className="flex flex-col items-center py-2 px-1">
              <span className="text-sm mb-0.5">{item.icon}</span>
              <span className="text-[13px] font-bold text-gray-800 leading-tight">{item.count}</span>
              <span className="text-[8px] text-gray-400">{item.label}</span>
              <span className="text-[8px] text-rose-400 mt-0.5">{item.last}</span>
            </div>
          ))}
        </div>
      </div>

      {/* Quick Log */}
      <div className="px-3 mb-2">
        <p className="font-semibold text-gray-800 text-[10px] mb-1.5">Quick Log</p>
        <div className="flex gap-2">
          {[["🍼","Feed"],["😴","Sleep"],["🚼","Diaper"]].map(([icon, lbl]) => (
            <div key={lbl} className="flex flex-col items-center bg-white rounded-xl shadow-sm py-2 px-3 gap-0.5">
              <span className="text-lg">{icon}</span>
              <span className="text-[9px] text-gray-600">{lbl}</span>
            </div>
          ))}
        </div>
      </div>

      {/* Recent Activity */}
      <div className="px-3 flex-1 overflow-hidden">
        <div className="flex justify-between items-center mb-1.5">
          <p className="font-semibold text-gray-800 text-[10px]">Recent Activity</p>
          <span className="text-rose-500 text-[9px]">See all →</span>
        </div>
        <div className="space-y-1.5">
          {[
            { icon: "🍼", label: "Feed",  detail: "90 ml",  time: "10:42 AM" },
            { icon: "😴", label: "Sleep", detail: "2h",     time: "8:30 AM" },
            { icon: "🚼", label: "Diaper",detail: "",       time: "7:00 AM" },
          ].map(row => (
            <div key={row.time} className="flex items-center justify-between bg-white rounded-xl px-2.5 py-1.5">
              <div className="flex items-center gap-2">
                <span className="text-sm">{row.icon}</span>
                <div>
                  <p className="font-medium text-gray-800 text-[10px]">{row.label}</p>
                  <p className="text-gray-400 text-[8px]">{row.time}</p>
                </div>
              </div>
              {row.detail && <span className="text-gray-400 text-[9px]">{row.detail}</span>}
            </div>
          ))}
        </div>
      </div>

      {/* Bottom tab bar strip */}
      <div className="mt-auto border-t border-gray-100 bg-white flex justify-around py-1.5 px-2">
        {[["🏡","Home"],["📋","Activity"],["✨","AI"],["☰","Menu"]].map(([icon, lbl]) => (
          <div key={lbl} className="flex flex-col items-center gap-0.5">
            <span className="text-sm">{icon}</span>
            <span className={`text-[7px] ${lbl === "Home" ? "text-rose-500 font-semibold" : "text-gray-400"}`}>{lbl}</span>
          </div>
        ))}
      </div>
    </div>
  );
}

// ── Screen 1: Vaccinations ──────────────────────────────────────
function VaccinationsScreen() {
  return (
    <div className="w-full h-full bg-gradient-to-br from-rose-50 to-amber-50 flex flex-col overflow-hidden text-[10px]">
      {/* Header */}
      <div className="flex items-center gap-2 px-3 pt-8 pb-3">
        <span className="text-gray-500 text-sm">←</span>
        <p className="font-bold text-gray-900 text-[13px]">Medical</p>
      </div>

      {/* Tab bar */}
      <div className="px-3 mb-2">
        <div className="flex gap-1 bg-white rounded-xl p-1 shadow-sm">
          {["Vaccines","Medicine","Allergies"].map((t, i) => (
            <div key={t} className={`flex-1 text-center py-1 rounded-lg text-[8px] font-medium ${i === 0 ? "bg-rose-500 text-white" : "text-gray-500"}`}>
              {t}
            </div>
          ))}
        </div>
      </div>

      <p className="px-3 font-semibold text-gray-800 text-[10px] mb-2">IAP Schedule</p>

      {/* Status tabs */}
      <div className="px-3 mb-2">
        <div className="flex gap-1">
          {[["Upcoming (3)","rose"],["Completed (4)","gray"],["Overdue (0)","gray"]].map(([lbl, col]) => (
            <div key={lbl} className={`px-2 py-1 rounded-full text-[8px] font-medium border ${col === "rose" ? "bg-rose-100 text-rose-700 border-rose-200" : "bg-white text-gray-500 border-gray-200"}`}>
              {lbl}
            </div>
          ))}
        </div>
      </div>

      {/* Vaccine rows */}
      <div className="px-3 space-y-1.5 flex-1 overflow-hidden">
        {[
          { name: "OPV-1",          due: "15 Jul 2025", done: false },
          { name: "Pentavalent-1",  due: "15 Jul 2025", done: false },
          { name: "PCV-1",          due: "10 Jul 2025", done: true  },
          { name: "Rota-1",         due: "15 Jul 2025", done: false },
        ].map(v => (
          <div key={v.name} className="bg-white rounded-xl px-2.5 py-2 flex items-center justify-between shadow-sm">
            <div>
              <p className="font-medium text-gray-900 text-[10px]">{v.name}</p>
              <p className="text-gray-400 text-[8px]">Due: {v.due}</p>
            </div>
            {v.done
              ? <span className="text-green-500 font-bold text-sm">✓</span>
              : <div className="px-2 py-1 bg-rose-400 text-white rounded-lg text-[8px] font-medium">Mark Given</div>
            }
          </div>
        ))}
      </div>

      {/* Telegram chip */}
      <div className="mx-3 mt-2 mb-3 bg-sky-50 border border-sky-200 rounded-xl px-3 py-2 flex items-center gap-2">
        <span className="text-sm">📲</span>
        <p className="text-sky-700 text-[9px] font-medium">Telegram reminder in 3 days</p>
      </div>

      {/* Bottom tab strip */}
      <div className="border-t border-gray-100 bg-white flex justify-around py-1.5 px-2">
        {[["🏡","Home"],["📋","Activity"],["✨","AI"],["☰","Menu"]].map(([icon, lbl]) => (
          <div key={lbl} className="flex flex-col items-center gap-0.5">
            <span className="text-sm">{icon}</span>
            <span className="text-[7px] text-gray-400">{lbl}</span>
          </div>
        ))}
      </div>
    </div>
  );
}

// ── Screen 2: Memories ──────────────────────────────────────────
function MemoriesScreen() {
  return (
    <div className="w-full h-full bg-gradient-to-br from-rose-50 to-amber-50 flex flex-col overflow-hidden text-[10px]">
      {/* Header */}
      <div className="flex items-center gap-2 px-3 pt-8 pb-3">
        <span className="text-gray-500 text-sm">←</span>
        <p className="font-bold text-gray-900 text-[13px]">Memories</p>
      </div>

      {/* Folder tabs */}
      <div className="px-3 mb-3">
        <div className="flex gap-1.5 overflow-hidden">
          {[["🌟","All"],["👣","First Steps"],["🛁","Bath Time"],["🍼","Feeding"]].map(([emoji, lbl], i) => (
            <div key={lbl} className={`flex-shrink-0 flex items-center gap-1 px-2 py-1 rounded-full text-[8px] font-medium border ${i === 0 ? "bg-rose-100 text-rose-700 border-rose-200" : "bg-white text-gray-500 border-gray-200"}`}>
              <span>{emoji}</span><span>{lbl}</span>
            </div>
          ))}
        </div>
      </div>

      {/* Photo grid */}
      <div className="px-3 grid grid-cols-2 gap-2 flex-1 overflow-hidden">
        {[
          { bg: "bg-rose-200",   emoji: "😊", caption: "First smile"  },
          { bg: "bg-amber-200",  emoji: "🛁", caption: "Bath time"    },
          { bg: "bg-violet-200", emoji: "🏆", caption: "4 months!"    },
          { bg: "bg-green-200",  emoji: "👨‍👩‍👧", caption: "With Nani"   },
        ].map(photo => (
          <div key={photo.caption} className={`${photo.bg} rounded-xl flex flex-col items-center justify-center aspect-square gap-1`}>
            <span className="text-2xl">{photo.emoji}</span>
            <span className="text-[8px] text-gray-600 font-medium">{photo.caption}</span>
          </div>
        ))}
      </div>

      {/* Upload row */}
      <div className="mx-3 mt-2 mb-2">
        <div className="border-2 border-dashed border-rose-200 rounded-xl flex items-center justify-center py-2 gap-2">
          <span className="text-sm">📷</span>
          <span className="text-rose-400 text-[9px] font-medium">Add memory</span>
        </div>
      </div>

      {/* Bottom tab strip */}
      <div className="border-t border-gray-100 bg-white flex justify-around py-1.5 px-2">
        {[["🏡","Home"],["📋","Activity"],["✨","AI"],["☰","Menu"]].map(([icon, lbl]) => (
          <div key={lbl} className="flex flex-col items-center gap-0.5">
            <span className="text-sm">{icon}</span>
            <span className="text-[7px] text-gray-400">{lbl}</span>
          </div>
        ))}
      </div>
    </div>
  );
}

// ── Main component ──────────────────────────────────────────────
export function PhoneMockup() {
  const [active, setActive] = useState(0);
  const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null);

  const start = useCallback(() => {
    if (intervalRef.current) clearInterval(intervalRef.current);
    intervalRef.current = setInterval(() => {
      setActive(prev => (prev + 1) % SCREENS.length);
    }, 2500);
  }, []);

  const stop = useCallback(() => {
    if (intervalRef.current) {
      clearInterval(intervalRef.current);
      intervalRef.current = null;
    }
  }, []);

  useEffect(() => {
    start();
    return stop;
  }, [start, stop]);

  const screenComponents = [<HomeScreen key="home" />, <VaccinationsScreen key="vax" />, <MemoriesScreen key="mem" />];

  return (
    <div className="flex flex-col items-center gap-3">
      {/* Phone */}
      <div
        className="relative"
        style={{ width: 280 }}
        onMouseEnter={stop}
        onMouseLeave={start}
      >
        {/* Device shell */}
        <div className="absolute inset-0 -m-3 rounded-[42px] bg-gray-900 shadow-2xl" />

        {/* Screen */}
        <div className="relative rounded-[34px] overflow-hidden bg-white" style={{ height: 580 }}>
          {screenComponents.map((screen, i) => (
            <div
              key={i}
              className={`absolute inset-0 transition-opacity duration-500 ${active === i ? "opacity-100" : "opacity-0 pointer-events-none"}`}
            >
              {screen}
            </div>
          ))}

          {/* Dot indicators */}
          <div className="absolute bottom-3 left-0 right-0 flex justify-center gap-1.5 z-10">
            {SCREENS.map((_, i) => (
              <button
                key={i}
                onClick={() => { stop(); setActive(i); }}
                className={`w-2 h-2 rounded-full transition-all duration-300 ${active === i ? "bg-rose-500 w-4" : "bg-rose-200"}`}
                aria-label={`Show screen ${i + 1}`}
              />
            ))}
          </div>
        </div>

        {/* Notch */}
        <div className="absolute top-0 left-1/2 -translate-x-1/2 w-24 h-6 bg-gray-900 rounded-b-2xl z-10" />
      </div>
    </div>
  );
}
