"use client";

import { useState } from "react";
import Link from "next/link";

/* ------------------------------------------------------------------ */
/*  README content (rendered as simple markdown-ish HTML)              */
/* ------------------------------------------------------------------ */

const README_LINES = [
  { tag: "h1", text: "betterNAS" },
  {
    tag: "p",
    text: "betterNAS is a self-hostable WebDAV stack for mounting NAS exports in Finder.",
  },
  { tag: "p", text: "The default product shape is:" },
  {
    tag: "ul",
    items: [
      "node-service serves the real files from the NAS over WebDAV",
      "control-server owns auth, nodes, exports, grants, and mount profile issuance",
      "web control plane lets the user manage the NAS and get mount instructions",
      "macOS client starts as native Finder WebDAV mounting, with a thin helper later",
    ],
  },
  {
    tag: "p",
    text: "For now, the whole stack should be able to run on the user's NAS device.",
  },
  { tag: "h2", text: "Current repo shape" },
  {
    tag: "ul",
    items: [
      "apps/node-agent - NAS-side Go runtime and WebDAV server",
      "apps/control-plane - Go backend for auth, registry, and mount profile issuance",
      "apps/web - Next.js web control plane",
      "apps/nextcloud-app - optional Nextcloud adapter, not the product center",
      "packages/contracts - canonical shared contracts",
      "infra/docker - self-hosted local stack",
    ],
  },
  { tag: "h2", text: "Verify" },
  { tag: "code", text: "pnpm verify" },
  { tag: "h2", text: "Current end-to-end slice" },
  {
    tag: "ol",
    items: [
      "Boot the stack with pnpm stack:up",
      "Verify it with pnpm stack:verify",
      "Get the WebDAV mount profile from the control plane",
      "Mount it in Finder with the issued credentials",
    ],
  },
  { tag: "h2", text: "Product boundary" },
  {
    tag: "p",
    text: "The default betterNAS product is self-hosted and WebDAV-first. Nextcloud remains optional and secondary.",
  },
] as const;

/* ------------------------------------------------------------------ */
/*  Icons                                                             */
/* ------------------------------------------------------------------ */

function GithubIcon({ className }: { className?: string }) {
  return (
    <svg viewBox="0 0 16 16" fill="currentColor" className={className}>
      <path d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0016 8c0-4.42-3.58-8-8-8z" />
    </svg>
  );
}

function ClockIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <circle cx="12" cy="12" r="10" />
      <path d="M12 6v6l4 2" />
    </svg>
  );
}

function SharedIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <path d="M17 21v-2a4 4 0 00-4-4H5a4 4 0 00-4 4v2" />
      <circle cx="9" cy="7" r="4" />
      <path d="M23 21v-2a4 4 0 00-3-3.87M16 3.13a4 4 0 010 7.75" />
    </svg>
  );
}

function LibraryIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <path d="M3 21h18M3 7v14M21 7v14M6 7V3h12v4M9 21V11M15 21V11" />
    </svg>
  );
}

function AppIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <path d="M12 2L2 7l10 5 10-5-10-5zM2 17l10 5 10-5M2 12l10 5 10-5" />
    </svg>
  );
}

function DesktopIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <rect x="2" y="3" width="20" height="14" rx="2" />
      <path d="M8 21h8M12 17v4" />
    </svg>
  );
}

function DownloadIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <path d="M21 15v4a2 2 0 01-2 2H5a2 2 0 01-2-2v-4M7 10l5 5 5-5M12 15V3" />
    </svg>
  );
}

function DocumentsIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <path d="M14 2H6a2 2 0 00-2 2v16a2 2 0 002 2h12a2 2 0 002-2V8z" />
      <polyline points="14,2 14,8 20,8" />
    </svg>
  );
}

function FolderIcon({ className }: { className?: string }) {
  return (
    <svg className={className ?? "size-[18px] text-[#65a2f8]"} viewBox="0 0 24 24" fill="currentColor">
      <path d="M2 6a2 2 0 012-2h5l2 2h9a2 2 0 012 2v10a2 2 0 01-2 2H4a2 2 0 01-2-2V6z" />
    </svg>
  );
}

function CloudIcon() {
  return (
    <svg className="size-[18px]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <path d="M18 10h-1.26A8 8 0 109 20h9a5 5 0 000-10z" />
    </svg>
  );
}

function HomeIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <path d="M3 12l2-2m0 0l7-7 7 7M5 10v10a1 1 0 001 1h3m10-11l2 2m-2-2v10a1 1 0 01-1 1h-3m-4 0a1 1 0 01-1-1v-4a1 1 0 011-1h2a1 1 0 011 1v4a1 1 0 01-1 1" />
    </svg>
  );
}

function NetworkIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <rect x="2" y="3" width="20" height="14" rx="2" />
      <path d="M8 21h8M12 17v4" />
    </svg>
  );
}

function AirdropIcon() {
  return (
    <svg className="size-[18px] text-[#65a2f8]" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
      <circle cx="12" cy="12" r="3" />
      <path d="M16.24 7.76a6 6 0 010 8.49M7.76 16.24a6 6 0 010-8.49M19.07 4.93a10 10 0 010 14.14M4.93 19.07a10 10 0 010-14.14" />
    </svg>
  );
}

/* ------------------------------------------------------------------ */
/*  README modal (Quick Look style)                                   */
/* ------------------------------------------------------------------ */

function ReadmeModal({ onClose }: { onClose: () => void }) {
  return (
    <div
      className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm"
      onClick={onClose}
    >
      <div
        className="relative mx-4 flex max-h-[80vh] w-full max-w-2xl flex-col overflow-hidden rounded-xl border border-border bg-card shadow-2xl"
        onClick={(e) => e.stopPropagation()}
      >
        {/* titlebar */}
        <div className="flex shrink-0 items-center justify-between border-b border-border px-4 py-3">
          <div className="flex items-center gap-2">
            <button
              onClick={onClose}
              className="flex size-3 items-center justify-center rounded-full bg-[#ff5f57] transition-opacity hover:opacity-80"
              aria-label="Close"
            />
            <span className="size-3 rounded-full bg-[#febc2e]" />
            <span className="size-3 rounded-full bg-[#28c840]" />
          </div>
          <span className="text-xs font-medium text-muted-foreground">
            README.md
          </span>
          <span className="w-[52px]" />
        </div>

        {/* body */}
        <div className="overflow-y-auto p-6">
          <div className="prose-sm max-w-none space-y-4 text-foreground">
            {README_LINES.map((block, i) => {
              if (block.tag === "h1")
                return (
                  <h1
                    key={i}
                    className="text-2xl font-bold tracking-tight text-foreground"
                  >
                    {block.text}
                  </h1>
                );
              if (block.tag === "h2")
                return (
                  <h2
                    key={i}
                    className="mt-6 border-b border-border pb-1 text-lg font-semibold text-foreground"
                  >
                    {block.text}
                  </h2>
                );
              if (block.tag === "p")
                return (
                  <p key={i} className="text-sm leading-relaxed text-muted-foreground">
                    {block.text}
                  </p>
                );
              if (block.tag === "code")
                return (
                  <pre
                    key={i}
                    className="rounded-lg border border-border bg-muted/40 px-4 py-3 font-mono text-xs text-foreground"
                  >
                    {block.text}
                  </pre>
                );
              if (block.tag === "ul")
                return (
                  <ul key={i} className="space-y-1 pl-5 text-sm text-muted-foreground">
                    {block.items.map((item, j) => (
                      <li key={j} className="list-disc">
                        <code className="rounded bg-muted/60 px-1 py-0.5 text-xs text-foreground">
                          {item.split(" - ")[0]}
                        </code>
                        {item.includes(" - ") && (
                          <span className="text-muted-foreground">
                            {" "}
                            - {item.split(" - ").slice(1).join(" - ")}
                          </span>
                        )}
                      </li>
                    ))}
                  </ul>
                );
              if (block.tag === "ol")
                return (
                  <ol key={i} className="space-y-1 pl-5 text-sm text-muted-foreground">
                    {block.items.map((item, j) => (
                      <li key={j} className="list-decimal">
                        {item}
                      </li>
                    ))}
                  </ol>
                );
              return null;
            })}
          </div>
        </div>
      </div>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/*  Finder sidebar item                                               */
/* ------------------------------------------------------------------ */

function SidebarItem({
  icon,
  label,
  active,
  accent,
  onClick,
}: {
  icon: React.ReactNode;
  label: string;
  active?: boolean;
  accent?: string;
  onClick?: () => void;
}) {
  return (
    <button
      onClick={onClick}
      className={`flex w-full items-center gap-2.5 rounded-md px-2 py-[5px] text-left text-[13px] transition-colors ${
        active
          ? "bg-primary/15 text-foreground"
          : "text-muted-foreground hover:bg-muted/50"
      }`}
    >
      <span className={accent ?? ""}>{icon}</span>
      <span className="truncate">{label}</span>
    </button>
  );
}

/* ------------------------------------------------------------------ */
/*  Finder file grid item (folder)                                    */
/* ------------------------------------------------------------------ */

function GridFolder({
  name,
  itemCount,
  onClick,
}: {
  name: string;
  itemCount?: number;
  onClick?: () => void;
}) {
  return (
    <button
      onClick={onClick}
      className="group flex flex-col items-center gap-1 rounded-lg p-3 transition-colors hover:bg-muted/50"
    >
      <svg className="size-16 text-[#3b9dff] drop-shadow-sm" viewBox="0 0 64 56" fill="currentColor">
        <path d="M2 8a6 6 0 016-2h14l4 4h30a6 6 0 016 6v32a6 6 0 01-6 6H8a6 6 0 01-6-6V8z" opacity="0.85" />
        <path d="M2 16h60v32a6 6 0 01-6 6H8a6 6 0 01-6-6V16z" opacity="0.95" />
      </svg>
      <span className="max-w-[100px] truncate text-xs text-foreground">
        {name}
      </span>
      {itemCount !== undefined && (
        <span className="text-[10px] text-muted-foreground">
          {itemCount} {itemCount === 1 ? "item" : "items"}
        </span>
      )}
    </button>
  );
}

/* ------------------------------------------------------------------ */
/*  Finder file grid item (file)                                      */
/* ------------------------------------------------------------------ */

function GridFile({
  name,
  meta,
  onClick,
}: {
  name: string;
  meta?: string;
  onClick?: () => void;
}) {
  return (
    <button
      onClick={onClick}
      className="group flex flex-col items-center gap-1 rounded-lg p-3 transition-colors hover:bg-muted/50"
    >
      <div className="relative flex size-16 items-center justify-center">
        <svg className="size-14 text-muted-foreground/30" viewBox="0 0 48 56" fill="currentColor">
          <path d="M4 0h28l12 12v40a4 4 0 01-4 4H4a4 4 0 01-4-4V4a4 4 0 014-4z" />
          <path d="M32 0l12 12H36a4 4 0 01-4-4V0z" opacity="0.5" />
        </svg>
        <span className="absolute bottom-2 text-[9px] font-semibold uppercase tracking-wide text-foreground/60">
          MD
        </span>
      </div>
      <span className="max-w-[100px] truncate text-xs text-foreground">
        {name}
      </span>
      {meta && (
        <span className="text-[10px] text-muted-foreground">{meta}</span>
      )}
    </button>
  );
}

/* ------------------------------------------------------------------ */
/*  Main page                                                         */
/* ------------------------------------------------------------------ */

export default function LandingPage() {
  const [readmeOpen, setReadmeOpen] = useState(false);
  const [selectedSidebar, setSelectedSidebar] = useState("DAV");

  return (
    <div className="flex min-h-screen flex-col bg-background text-foreground">
      {/* ---- header ---- */}
      <header className="flex shrink-0 items-center justify-end px-5 py-3.5">
        <div className="flex items-center gap-2">
          <Link
            href="/login"
            className="rounded-xl border border-border bg-muted/30 px-4 py-1.5 text-sm text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
          >
            Sign in
          </Link>
          <a
            href="https://github.com/harivansh-afk/betterNAS"
            target="_blank"
            rel="noopener noreferrer"
            className="flex size-8 items-center justify-center rounded-xl border border-border bg-muted/30 text-muted-foreground transition-colors hover:bg-muted hover:text-foreground"
            aria-label="GitHub"
          >
            <GithubIcon className="size-4" />
          </a>
        </div>
      </header>

      {/* ---- finder ---- */}
      <main className="flex flex-1 items-center justify-center p-4 sm:p-8">
        <div className="w-full max-w-4xl overflow-hidden rounded-xl border border-border bg-card shadow-xl">
          {/* titlebar */}
          <div className="flex items-center border-b border-border bg-muted/30 px-4 py-2.5">
            <div className="flex items-center gap-2">
              <span className="size-3 rounded-full bg-[#ff5f57]" />
              <span className="size-3 rounded-full bg-[#febc2e]" />
              <span className="size-3 rounded-full bg-[#28c840]" />
            </div>

            <div className="mx-auto flex items-center gap-2">
              <span className="text-sm font-medium text-foreground">DAV</span>
            </div>

            {/* forward/back placeholders */}
            <div className="flex items-center gap-1 text-muted-foreground/40">
              <svg className="size-4" viewBox="0 0 16 16" fill="none" stroke="currentColor" strokeWidth="1.5">
                <path d="M10 3L5 8l5 5" />
              </svg>
              <svg className="size-4" viewBox="0 0 16 16" fill="none" stroke="currentColor" strokeWidth="1.5">
                <path d="M6 3l5 5-5 5" />
              </svg>
            </div>
          </div>

          {/* content area */}
          <div className="flex min-h-[480px]">
            {/* ---- sidebar ---- */}
            <div className="hidden w-[180px] shrink-0 flex-col gap-0.5 border-r border-border bg-muted/20 p-3 sm:flex">
              {/* Favorites */}
              <p className="mb-1 mt-1 px-2 text-[10px] font-semibold uppercase tracking-widest text-muted-foreground/50">
                Favorites
              </p>
              <SidebarItem icon={<ClockIcon />} label="Recents" />
              <SidebarItem icon={<SharedIcon />} label="Shared" />
              <SidebarItem icon={<LibraryIcon />} label="Library" />
              <SidebarItem icon={<AppIcon />} label="Applications" />
              <SidebarItem icon={<DesktopIcon />} label="Desktop" />
              <SidebarItem icon={<DownloadIcon />} label="Downloads" />
              <SidebarItem icon={<DocumentsIcon />} label="Documents" />
              <SidebarItem icon={<FolderIcon className="size-[18px] text-[#65a2f8]" />} label="GitHub" />

              {/* Locations */}
              <p className="mb-1 mt-4 px-2 text-[10px] font-semibold uppercase tracking-widest text-muted-foreground/50">
                Locations
              </p>
              <SidebarItem icon={<HomeIcon />} label="rathi" />
              <SidebarItem icon={<NetworkIcon />} label="hari-macbook-pro" />
              <SidebarItem
                icon={<CloudIcon />}
                label="DAV"
                active={selectedSidebar === "DAV"}
                accent="text-[#65a2f8]"
                onClick={() => setSelectedSidebar("DAV")}
              />
              <SidebarItem icon={<AirdropIcon />} label="AirDrop" />
            </div>

            {/* ---- file grid ---- */}
            <div className="flex flex-1 flex-col">
              {/* toolbar */}
              <div className="flex items-center justify-between border-b border-border px-4 py-2">
                <div className="flex items-center gap-1.5 text-xs text-muted-foreground">
                  <CloudIcon />
                  <span className="font-medium text-foreground">DAV</span>
                  <span className="text-muted-foreground/50">/</span>
                  <span>exports</span>
                </div>
                <div className="flex items-center gap-2 text-muted-foreground/50">
                  <svg className="size-4" viewBox="0 0 16 16" fill="none" stroke="currentColor" strokeWidth="1.5">
                    <rect x="1" y="1" width="6" height="6" rx="1" />
                    <rect x="9" y="1" width="6" height="6" rx="1" />
                    <rect x="1" y="9" width="6" height="6" rx="1" />
                    <rect x="9" y="9" width="6" height="6" rx="1" />
                  </svg>
                  <svg className="size-4" viewBox="0 0 16 16" fill="none" stroke="currentColor" strokeWidth="1.5">
                    <path d="M2 4h12M2 8h12M2 12h12" />
                  </svg>
                </div>
              </div>

              {/* files */}
              <div className="flex-1 p-4">
                <div className="grid grid-cols-2 gap-1 sm:grid-cols-4 md:grid-cols-5">
                  <GridFolder name="Movies" itemCount={12} />
                  <GridFolder name="Music" itemCount={847} />
                  <GridFolder name="Photos" itemCount={3241} />
                  <GridFolder name="Documents" itemCount={56} />
                  <GridFolder name="Backups" itemCount={4} />
                  <GridFile
                    name="README.md"
                    meta="4 KB"
                    onClick={() => setReadmeOpen(true)}
                  />
                </div>
              </div>

              {/* statusbar */}
              <div className="flex items-center justify-between border-t border-border px-4 py-1.5 text-[11px] text-muted-foreground/50">
                <span>5 folders, 1 file</span>
                <span>847 GB available</span>
              </div>
            </div>
          </div>
        </div>
      </main>

      {/* ---- readme modal ---- */}
      {readmeOpen && <ReadmeModal onClose={() => setReadmeOpen(false)} />}
    </div>
  );
}