"use client";
import { useEffect, useState } from "react";
import { SidebarNav } from "./SidebarNav";
import { WatchlistSidebar } from "./WatchlistSidebar";
import { SymbolHeader } from "./SymbolHeader";
import { MobileTabNav } from "./MobileTabNav";
import { CommandPalette } from "./CommandPalette";
import { CollapsibleProvider, useCollapsibleContext } from "@/lib/collapsible-context";
import { useKeyboardShortcuts } from "@/lib/useKeyboardShortcuts";

const MOBILE_BREAKPOINT = 768;
const TABLET_BREAKPOINT = 1024;

function useViewport() {
  const [width, setWidth] = useState(typeof window !== "undefined" ? window.innerWidth : 1200);
  useEffect(() => {
    const handler = () => setWidth(window.innerWidth);
    window.addEventListener("resize", handler);
    return () => window.removeEventListener("resize", handler);
  }, []);
  return width;
}

/**
 * Inner component that attaches the global Escape listener.
 * Wrapped in CollapsibleProvider so all CollapsibleSections can register.
 */
function LayoutShellInner({ children }: { children: React.ReactNode }) {
  const { openSectionId, setOpenSectionId } = useCollapsibleContext();
  const viewportWidth = useViewport();
  const isMobile = viewportWidth < MOBILE_BREAKPOINT;
  const isTablet = viewportWidth >= MOBILE_BREAKPOINT && viewportWidth < TABLET_BREAKPOINT;

  // Keyboard shortcuts: Escape closes open sections, modals
  useKeyboardShortcuts([
    {
      key: "Escape",
      handler: () => {
        if (openSectionId) {
          setOpenSectionId(null);
        }
      },
    },
  ]);

  // Global Escape listener: collapse the currently open section.
  useEffect(() => {
    const handler = (e: KeyboardEvent) => {
      if (e.key === "Escape" && openSectionId) {
        e.preventDefault();
        // Collapse the currently open section by clearing the shared state.
        // Individual CollapsibleSection Escape handlers also respond to this.
        setOpenSectionId(null);
      }
    };
    window.addEventListener("keydown", handler, true); // capture phase
    return () => window.removeEventListener("keydown", handler, true);
  }, [openSectionId, setOpenSectionId]);

  return (
    <div className="min-h-screen bg-surface text-fg flex flex-col">
      {/* Symbol Header — always visible */}
      <SymbolHeader />

      {/* Global command palette (⌘K) */}
      <CommandPalette />

      {/* Main Content Area — responsive layout */}
      {isMobile ? (
        /* Mobile: single column, no sidebar */
        <>
          <main className="flex-1 overflow-y-auto overflow-x-hidden p-4 pb-20">
            <div className="max-w-7xl mx-auto space-y-6">
              {children}
            </div>
          </main>
          <MobileTabNav />
        </>
      ) : isTablet ? (
        /* Tablet: 2-column layout, watchlist accessible via compact bar */
        <div className="flex flex-1 overflow-hidden flex-col">
          {/* Compact horizontal watchlist bar */}
          <div className="hidden md:block border-b border-line-strong bg-surface-raised px-4 sm:px-6 py-2 overflow-x-auto">
            <WatchlistSidebar compact />
          </div>
          <div className="flex flex-1 overflow-hidden">
            {/* Center content */}
            <main className="flex-1 overflow-y-auto p-4 sm:p-6">
              <div className="max-w-7xl mx-auto space-y-6">
                {children}
              </div>
            </main>
            {/* Right analytics — drops below on tablet */}
            <aside className="hidden lg:block w-80 border-l border-line-strong bg-surface-raised overflow-y-auto">
              <div className="p-4 sm:p-6 space-y-4">
                {/* Right column content placeholder */}
              </div>
            </aside>
          </div>
        </div>
      ) : (
        /* Desktop: 3-column layout */
        <div className="flex flex-1 overflow-hidden">
          {/* Left Sidebar Navigation */}
          <SidebarNav />

          {/* Watchlist Sidebar */}
          <WatchlistSidebar />

          {/* Content */}
          <main className="flex-1 overflow-y-auto p-4 sm:p-6 lg:p-4 xl:p-4 2xl:p-4">
            <div className="max-w-7xl mx-auto space-y-6">
              {children}
            </div>
          </main>
        </div>
      )}
    </div>
  );
}

/**
 * Main layout shell for the redesigned terminal.
 * - Desktop (>1024px): Sidebar + Watchlist + Header + Content (3-column)
 * - Tablet (768-1024px): Watchlist + Header + Content (2-column, sidebar hidden)
 * - Mobile (<768px): Header + Content (single column) + MobileTabNav
 */
export function LayoutShell({ children }: { children: React.ReactNode }) {
  return (
    <CollapsibleProvider>
      <LayoutShellInner>{children}</LayoutShellInner>
    </CollapsibleProvider>
  );
}