import Link from "next/link";
import { Metadata } from "next";
import { Card, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import {
  Gauge,
  Ruler,
  Timer,
  Focus,
  MoveRight,
  ChevronRight,
} from "lucide-react";

export const metadata: Metadata = {
  title: "Laser Toolkit",
  description: "Quick utilities for scaling settings and converting resolution units.",
};

type Tool = {
  slug: string;
  title: string;
  description: string;
  icon: React.ComponentType<React.SVGProps<SVGSVGElement>>;
};

const TOOLS: Tool[] = [
  {
    slug: "power-lens-scaler",
    title: "Power & Lens Scaler",
    description: "Scale speed, power, and frequency when wattage or lens field size changes.",
    icon: Gauge,
  },
  {
    slug: "dpi-lpi-dpcm",
    title: "DPI ▸ LPI ▸ DPCM",
    description: "Convert between DPI, LPI, and DPCM. Bidirectional. Assumes LPI≈DPI for raster rows (common workflow).",
    icon: Ruler,
  },

  // NEW
  {
    slug: "pulse-overlap",
    title: "Pulse Overlap",
    description:
      "Given speed (mm/s), frequency (kHz) and spot size (µm), compute pulse spacing, overlap %, and pulses/mm.",
    icon: MoveRight,
  },
  {
    slug: "hatch-overlap",
    title: "Hatch Overlap",
    description:
      "Given spot size (µm) and hatch gap (µm) or LPI, compute hatch overlap %. Great for vector fills.",
    icon: Ruler,
  },
  {
    slug: "job-time-estimator",
    title: "Job Time Estimator",
    description:
      "Quick estimate for raster or vector jobs. Uses dimensions, DPI/LPI or path length, speed, passes, and a small overhead factor.",
    icon: Timer,
  },
  {
    slug: "beam-spot-size",
    title: "Beam Spot Size",
    description:
      "Approximate diffraction-limited spot size from wavelength, focal length, beam diameter, and M².",
    icon: Focus,
  },
];

export default function ToolkitSplash() {
  return (
    <div className="mx-auto w-full max-w-6xl px-4 py-8">
      {/* Header */}
      <div className="mb-6 flex items-start justify-between gap-4">
        <div>
          <h1 className="text-2xl font-semibold tracking-tight">Laser Toolkit</h1>
          <p className="mt-1 text-sm text-muted-foreground">
            Handy calculators and converters for daily laser work —{" "}
            <span className="italic">hover for details</span>.
          </p>
        </div>

        <Button asChild variant="outline">
          <Link href="/">Back to Main Menu</Link>
        </Button>
      </div>

      {/* Grid of tools */}
      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-3">
        {TOOLS.map((tool) => (
          <Link key={tool.slug} href={`/laser-toolkit/${tool.slug}`} className="group">
            <Card className="relative overflow-hidden transition-shadow hover:shadow-md">
              <CardHeader className="p-4">
                <div className="flex items-start gap-3">
                  <div className="rounded-xl border bg-card p-2">
                    <tool.icon className="h-5 w-5" />
                  </div>
                  <div className="flex-1 min-w-0">
                    <CardTitle className="text-base">{tool.title}</CardTitle>

                    {/* Full description on hover (no truncation) */}
                    <p
                      className="
                        max-h-0 overflow-hidden text-xs text-muted-foreground opacity-0
                        transition-all duration-200
                        group-hover:max-h-96 group-hover:opacity-100
                        mt-1 whitespace-pre-wrap
                      "
                    >
                      {tool.description}
                    </p>
                  </div>
                  <ChevronRight className="mt-1 h-4 w-4 text-muted-foreground transition-transform group-hover:translate-x-0.5" />
                </div>
              </CardHeader>
            </Card>
          </Link>
        ))}
      </div>
    </div>
  );
}