"use client";

import { useState } from "react";
import {
  ArrowRight,
  BookOpen,
  CheckCircle2,
  Circle,
  Clock3,
  FileText,
  GraduationCap,
  Home,
  MessageSquareText,
  Play,
  Search,
  Sparkles,
} from "lucide-react";
import { DocDoeLogoMark } from "./DocDoeLogoMark";
import { cn } from "@/lib/utils";

export type WorkspaceView = "home" | "tuition" | "studychat" | "learn";

const nav = [
  { id: "home" as const, label: "Home", icon: Home },
  { id: "tuition" as const, label: "Tuition", icon: GraduationCap },
  { id: "learn" as const, label: "Learn Anything", icon: BookOpen },
  { id: "studychat" as const, label: "StudyChat", icon: MessageSquareText },
];

const tasks = [
  "Sound Waves: Oscillation, amplitude, period",
  "Sound Waves: Natural frequency & resonance",
  "Sound Waves: Wave motion and types",
  "Sound Waves: Frequency, wavelength, v = fλ",
];

const routeSteps = [
  "Learn today's concept",
  "Read the key notes",
  "Pass the checkpoints",
  "Fix weak areas",
  "Save revision",
];

const chatTools = [
  { title: "Solve a PYQ", desc: "Method, marks and final answer" },
  { title: "Explain a derivation", desc: "Steps, formula and exam method" },
  { title: "Make study notes", desc: "Clean notes from a topic or PDF" },
  { title: "Correct my answer", desc: "Marks, mistakes and improved answer" },
];

/**
 * Live-looking DocDoe workspace. Tabs switch real product surfaces
 * (Home / Tuition / StudyChat / Learn Anything) — not screenshots.
 */
export function WorkspaceInteractiveDemo({
  className,
  defaultView = "home",
}: {
  className?: string;
  defaultView?: WorkspaceView;
}) {
  const [view, setView] = useState<WorkspaceView>(defaultView);

  return (
    <div
      className={cn(
        "overflow-hidden rounded-[22px] border border-[#E6E8EE] bg-white shadow-[0_28px_80px_-24px_rgba(21,23,31,0.18)]",
        className,
      )}
    >
      {/* Window chrome */}
      <div className="flex items-center gap-2 border-b border-[#EEF0F4] bg-[#FAFBFC] px-4 py-2.5">
        <span className="size-2.5 rounded-full bg-[#E4E6EC]" />
        <span className="size-2.5 rounded-full bg-[#E4E6EC]" />
        <span className="size-2.5 rounded-full bg-[#E4E6EC]" />
        <span className="ml-2 text-[11px] font-medium text-[#8B90A0]">
          app.docdoe.in · live workspace
        </span>
      </div>

      <div className="grid min-h-[420px] grid-cols-1 sm:min-h-[480px] sm:grid-cols-[200px_1fr]">
        {/* Sidebar */}
        <aside className="hidden flex-col bg-[#0A0A0B] text-white sm:flex">
          <div className="flex items-center gap-2.5 px-4 py-4">
            <span className="grid size-8 place-items-center rounded-lg bg-white text-[#0A0A0B]">
              <DocDoeLogoMark className="size-4" />
            </span>
            <div>
              <p className="text-[13px] font-semibold tracking-tight">DocDoe</p>
              <p className="text-[10px] text-white/40">AI tuition partner</p>
            </div>
          </div>

          <nav className="flex flex-1 flex-col gap-0.5 px-2.5 pb-4" aria-label="Workspace demo">
            {nav.map((item) => {
              const Icon = item.icon;
              const active = view === item.id;
              return (
                <button
                  key={item.id}
                  type="button"
                  onClick={() => setView(item.id)}
                  className={cn(
                    "flex items-center gap-2.5 rounded-xl px-3 py-2.5 text-left text-[13px] font-medium transition-colors",
                    active
                      ? "bg-white text-[#0A0A0B]"
                      : "text-white/55 hover:bg-white/[0.06] hover:text-white",
                  )}
                >
                  <Icon className="size-4 shrink-0" strokeWidth={1.8} />
                  {item.label}
                  {active ? (
                    <span className="ml-auto size-1.5 rounded-full bg-violet-500" />
                  ) : null}
                </button>
              );
            })}
          </nav>

          <div className="border-t border-white/10 p-3">
            <div className="rounded-xl border border-white/10 bg-white/[0.04] px-3 py-2.5">
              <p className="text-[10px] font-semibold uppercase tracking-[0.12em] text-white/35">
                Student
              </p>
              <p className="mt-1 text-[12px] font-medium text-white/80">SSLC · 10th · Kerala</p>
            </div>
          </div>
        </aside>

        {/* Mobile tab bar */}
        <div className="flex gap-1 overflow-x-auto border-b border-[#EEF0F4] bg-[#FAFBFC] p-2 sm:hidden">
          {nav.map((item) => (
            <button
              key={item.id}
              type="button"
              onClick={() => setView(item.id)}
              className={cn(
                "shrink-0 rounded-full px-3 py-1.5 text-[12px] font-semibold",
                view === item.id
                  ? "bg-[#111] text-white"
                  : "bg-white text-[#5B5B66] ring-1 ring-[#E6E8EE]",
              )}
            >
              {item.label}
            </button>
          ))}
        </div>

        {/* Main content */}
        <div className="min-w-0 bg-[#F7F8FA]">
          <div className="flex items-center justify-between border-b border-[#EEF0F4] bg-white px-4 py-3">
            <p className="text-[13px] font-semibold text-[#111]">
              {nav.find((n) => n.id === view)?.label}
            </p>
            <div className="flex items-center gap-2 text-[11px] text-[#8B90A0]">
              <Search className="size-3.5" />
              <span className="hidden sm:inline">Search workspace</span>
            </div>
          </div>

          <div className="p-4 sm:p-5">
            {view === "home" ? (
              <HomeView
                onOpenTuition={() => setView("tuition")}
                onOpenLearn={() => setView("learn")}
                onOpenChat={() => setView("studychat")}
              />
            ) : null}
            {view === "tuition" ? <TuitionView /> : null}
            {view === "studychat" ? <StudyChatView /> : null}
            {view === "learn" ? <LearnView /> : null}
          </div>
        </div>
      </div>
    </div>
  );
}

function HomeView({
  onOpenTuition,
  onOpenLearn,
  onOpenChat,
}: {
  onOpenTuition: () => void;
  onOpenLearn: () => void;
  onOpenChat: () => void;
}) {
  return (
    <div className="space-y-4">
      <div>
        <p className="text-[12px] text-[#8B90A0]">Good evening</p>
        <h3 className="mt-0.5 text-xl font-semibold tracking-tight text-[#111]">
          Let&apos;s make today productive
        </h3>
        <p className="mt-1 text-[12px] text-[#6B7080]">SSLC / 10th · Kerala State Board</p>
      </div>

      <div className="grid gap-3 sm:grid-cols-[1.3fr_0.9fr]">
        <div className="relative overflow-hidden rounded-2xl bg-gradient-to-br from-[#1a1035] via-[#2b1654] to-[#0f0a1c] p-5 text-white">
          <p className="text-[10px] font-semibold uppercase tracking-[0.16em] text-white/50">
            Today&apos;s focus
          </p>
          <p className="mt-3 text-lg font-semibold tracking-tight">Sound Waves · Mission 01</p>
          <p className="mt-1 text-[12px] text-white/60">
            Oscillation, amplitude, period and frequency · 35 min
          </p>
          <button
            type="button"
            onClick={onOpenTuition}
            className="mt-5 inline-flex items-center gap-1.5 rounded-full bg-white px-4 py-2 text-[12px] font-semibold text-[#111]"
          >
            Continue learning
            <ArrowRight className="size-3.5" />
          </button>
          <div className="pointer-events-none absolute -right-6 -top-6 size-28 rounded-full bg-violet-400/20 blur-2xl" />
        </div>

        <div className="rounded-2xl border border-[#E6E8EE] bg-white p-4">
          <div className="flex items-center justify-between">
            <p className="text-[11px] font-semibold uppercase tracking-[0.12em] text-[#8B90A0]">
              Today&apos;s plan
            </p>
            <span className="rounded-full bg-violet-50 px-2 py-0.5 text-[10px] font-semibold text-violet-700">
              0/4
            </span>
          </div>
          <ul className="mt-3 space-y-2.5">
            {tasks.map((task, i) => (
              <li key={task} className="flex items-start gap-2 text-[12px] text-[#3A3F4B]">
                <Circle className="mt-0.5 size-3.5 shrink-0 text-[#C5C9D4]" />
                <span className="leading-snug">
                  <span className="font-medium">{task}</span>
                  <span className="mt-0.5 block text-[10px] text-[#8B90A0]">Physics · 35 min</span>
                </span>
                {i === 0 ? (
                  <button
                    type="button"
                    onClick={onOpenTuition}
                    className="ml-auto shrink-0 text-[11px] font-semibold text-violet-600"
                  >
                    Start
                  </button>
                ) : null}
              </li>
            ))}
          </ul>
        </div>
      </div>

      <div className="grid grid-cols-3 gap-2">
        {[
          { label: "Tuition", color: "from-violet-50 to-white", icon: GraduationCap, onClick: onOpenTuition },
          { label: "Learn Anything", color: "from-emerald-50 to-white", icon: BookOpen, onClick: onOpenLearn },
          { label: "StudyChat", color: "from-blue-50 to-white", icon: MessageSquareText, onClick: onOpenChat },
        ].map((card) => {
          const Icon = card.icon;
          return (
            <button
              key={card.label}
              type="button"
              onClick={card.onClick}
              className={cn(
                "rounded-xl border border-[#E6E8EE] bg-gradient-to-b p-3 text-left transition-colors hover:border-[#D0D4DE]",
                card.color,
              )}
            >
              <Icon className="size-4 text-[#3A3F4B]" strokeWidth={1.8} />
              <p className="mt-2 text-[11px] font-semibold text-[#111]">{card.label}</p>
            </button>
          );
        })}
      </div>
    </div>
  );
}

function TuitionView() {
  return (
    <div className="space-y-4">
      <div className="rounded-2xl bg-gradient-to-br from-[#1a1035] via-[#2b1654] to-[#120c22] p-5 text-white">
        <p className="text-[10px] font-semibold uppercase tracking-[0.16em] text-white/50">
          Today&apos;s tuition
        </p>
        <h3 className="mt-2 text-lg font-semibold tracking-tight sm:text-xl">
          Oscillation, Amplitude, Period and Frequency
        </h3>
        <p className="mt-1.5 max-w-md text-[12px] leading-relaxed text-white/60">
          Understand the basic terms of oscillatory motion using a pendulum and swing.
        </p>
        <div className="mt-3 flex flex-wrap items-center gap-3 text-[11px] text-white/55">
          <span className="inline-flex items-center gap-1">
            <Clock3 className="size-3" /> 20 mins
          </span>
          <span>Sound Waves · p.7</span>
        </div>
        <button
          type="button"
          className="mt-5 inline-flex items-center gap-1.5 rounded-full bg-white px-4 py-2 text-[12px] font-semibold text-[#111]"
        >
          <Play className="size-3 fill-current" />
          Start today&apos;s class
        </button>
      </div>

      <div className="grid gap-3 sm:grid-cols-[1fr_0.85fr]">
        <div className="rounded-2xl border border-[#E6E8EE] bg-white p-4">
          <div className="flex items-center justify-between">
            <p className="text-[11px] font-semibold uppercase tracking-[0.12em] text-violet-600">
              Your class route
            </p>
            <span className="rounded-full bg-violet-50 px-2 py-0.5 text-[10px] font-semibold text-violet-700">
              5 steps
            </span>
          </div>
          <ul className="mt-3 space-y-0">
            {routeSteps.map((step, i) => (
              <li
                key={step}
                className="flex items-center gap-3 border-b border-[#F0F1F5] py-2.5 last:border-0"
              >
                {i === 0 ? (
                  <span className="grid size-6 place-items-center rounded-full bg-violet-100 text-violet-700">
                    <Play className="size-3 fill-current" />
                  </span>
                ) : (
                  <Circle className="size-5 text-[#D0D3DC]" />
                )}
                <span className="text-[13px] font-medium text-[#222]">{step}</span>
                <span className="ml-auto text-[10px] text-[#8B90A0]">Step {i + 1}</span>
              </li>
            ))}
          </ul>
        </div>

        <div className="space-y-3">
          <div className="rounded-2xl border border-[#E6E8EE] bg-white p-4">
            <p className="text-[11px] font-semibold text-[#111]">Class summary</p>
            <dl className="mt-3 space-y-2 text-[12px]">
              {[
                ["Chapter", "Sound Waves"],
                ["Mission", "M1"],
                ["Time", "20 mins"],
                ["Source", "Textbook p.7"],
              ].map(([k, v]) => (
                <div key={k} className="flex justify-between gap-2">
                  <dt className="text-[#8B90A0]">{k}</dt>
                  <dd className="font-medium text-[#222]">{v}</dd>
                </div>
              ))}
            </dl>
          </div>
          <div className="rounded-2xl border border-[#E6E8EE] bg-white p-4">
            <p className="text-[11px] font-semibold text-[#111]">Why this class</p>
            <p className="mt-2 text-[12px] leading-relaxed text-[#5B5B66]">
              Next unfinished task in your saved plan. Aim: write exam keywords in your own words.
            </p>
          </div>
        </div>
      </div>
    </div>
  );
}

function StudyChatView() {
  return (
    <div className="space-y-4">
      <div className="text-center">
        <div className="mx-auto grid size-10 place-items-center rounded-xl bg-[#111] text-white">
          <DocDoeLogoMark className="size-5" />
        </div>
        <h3 className="mt-3 text-lg font-semibold tracking-tight text-[#111]">
          What do you need to understand?
        </h3>
        <p className="mt-1 text-[12px] text-[#8B90A0]">SSLC / 10th · Kerala · Physics</p>
      </div>

      <div className="grid gap-2 sm:grid-cols-2">
        {chatTools.map((tool) => (
          <button
            key={tool.title}
            type="button"
            className="flex items-start gap-3 rounded-xl border border-[#E6E8EE] bg-white p-3.5 text-left transition-colors hover:border-[#D0D4DE]"
          >
            <FileText className="mt-0.5 size-4 shrink-0 text-[#6B7080]" />
            <span>
              <span className="block text-[13px] font-semibold text-[#111]">{tool.title}</span>
              <span className="mt-0.5 block text-[11px] text-[#8B90A0]">{tool.desc}</span>
            </span>
            <ArrowRight className="ml-auto size-3.5 shrink-0 text-[#C5C9D4]" />
          </button>
        ))}
      </div>

      <div className="rounded-2xl border border-[#E6E8EE] bg-white p-3">
        <div className="flex items-center gap-2 rounded-xl bg-[#F7F8FA] px-3 py-2.5">
          <span className="flex-1 text-[12px] text-[#8B90A0]">
            Ask a doubt, paste a PYQ, or tell DocDoe what to teach…
          </span>
          <span className="grid size-8 place-items-center rounded-full bg-[#111] text-white">
            <ArrowRight className="size-3.5" />
          </span>
        </div>
        <p className="mt-2 text-center text-[10px] text-[#A0A4B0]">
          Answers can make mistakes. Check important exam facts against your source.
        </p>
      </div>
    </div>
  );
}

function LearnView() {
  return (
    <div className="space-y-4">
      <div>
        <h3 className="text-lg font-semibold tracking-tight text-[#111]">
          Learn Anything
        </h3>
        <p className="mt-1 text-[12px] text-[#6B7080]">
          Turn any topic into a clear roadmap with sessions, notes, and practice.
        </p>
      </div>

      <div className="rounded-2xl border border-[#E6E8EE] bg-white p-4">
        <p className="text-[12px] font-semibold text-[#111]">What do you want to learn?</p>
        <div className="mt-3 flex items-center gap-2 rounded-xl border border-[#E6E8EE] bg-[#FAFBFC] px-3 py-2.5">
          <Sparkles className="size-4 text-violet-500" />
          <span className="text-[12px] text-[#8B90A0]">I want to learn…</span>
        </div>
        <div className="mt-3 flex flex-wrap gap-2">
          {["Beginner", "3 months", "Career skill"].map((chip) => (
            <span
              key={chip}
              className="rounded-full border border-[#E6E8EE] bg-white px-2.5 py-1 text-[11px] font-medium text-[#5B5B66]"
            >
              {chip}
            </span>
          ))}
        </div>
        <div className="mt-3 flex flex-wrap gap-1.5">
          {["Data Science", "Python", "UI/UX", "Public Speaking"].map((t) => (
            <span
              key={t}
              className="rounded-full bg-violet-50 px-2.5 py-1 text-[10px] font-semibold text-violet-700"
            >
              {t}
            </span>
          ))}
        </div>
      </div>

      <div className="rounded-2xl border border-[#E6E8EE] bg-white p-4">
        <div className="flex items-center justify-between">
          <p className="text-[12px] font-semibold text-[#111]">Your learning roadmap</p>
          <span className="rounded-full bg-violet-50 px-2 py-0.5 text-[10px] font-semibold text-violet-700">
            Ready when you are
          </span>
        </div>
        <div className="mt-4 grid grid-cols-3 gap-2 sm:grid-cols-6">
          {["Goal", "Foundations", "Core ideas", "Practice", "Project", "Revision"].map(
            (stage, i) => (
              <div
                key={stage}
                className="rounded-xl border border-[#EEF0F4] bg-[#FAFBFC] px-2 py-3 text-center"
              >
                <span className="mx-auto grid size-6 place-items-center rounded-full border border-[#E0E3EA] text-[10px] font-semibold text-[#8B90A0]">
                  {i + 1}
                </span>
                <p className="mt-2 text-[10px] font-medium text-[#5B5B66]">{stage}</p>
              </div>
            ),
          )}
        </div>
      </div>

      <div className="flex items-start gap-2 rounded-xl border border-[#E6E8EE] bg-white p-3">
        <CheckCircle2 className="mt-0.5 size-4 shrink-0 text-emerald-500" />
        <p className="text-[12px] leading-relaxed text-[#5B5B66]">
          Name a skill, set your pace, start one session. Same student profile as Tuition and StudyChat.
        </p>
      </div>
    </div>
  );
}