"use client";

import { useMemo, useState } from "react";
import ToolShell from "@/components/toolkit/ToolShell";
import { Card, CardHeader, CardTitle, CardContent } from "@/components/ui/card";
import { Input } from "@/components/ui/input";

function num(v: string) {
  const n = parseFloat(v);
  return Number.isFinite(n) ? n : 0;
}

function fmtTime(seconds: number) {
  if (!Number.isFinite(seconds) || seconds <= 0) return "0 s";
  const s = Math.round(seconds);
  const m = Math.floor(s / 60);
  const rem = s % 60;
  if (m < 60) return `${m}m ${rem}s`;
  const h = Math.floor(m / 60);
  const mm = m % 60;
  return `${h}h ${mm}m`;
}

export default function Page() {
  const [mode, setMode] = useState<"raster" | "vector">("raster");
  const [passes, setPasses] = useState("1");

  // raster
  const [width, setWidth] = useState("100");  // mm
  const [height, setHeight] = useState("100");// mm
  const [dpi, setDpi] = useState("300");
  const [speedRaster, setSpeedRaster] = useState("800"); // mm/s
  const [overheadR, setOverheadR] = useState("1.10");    // factor

  // vector
  const [length, setLength] = useState("500"); // mm
  const [speedVector, setSpeedVector] = useState("50");  // mm/s
  const [overheadV, setOverheadV] = useState("1.05");   // factor

  const computed = useMemo(() => {
    const p = Math.max(1, Math.round(num(passes)));
    if (mode === "raster") {
      const w = num(width), h = num(height), D = num(dpi), v = num(speedRaster), k = Math.max(0.5, num(overheadR));
      if (w <= 0 || h <= 0 || D <= 0 || v <= 0) return { t: 0, gapMm: 0, gapUm: 0, rows: 0 };
      const gapMm = 25.4 / D;
      const gapUm = gapMm * 1000;
      const rows = h / gapMm;
      const t = rows * (w / v) * p * k;
      return { t, gapMm, gapUm, rows };
    } else {
      const L = num(length), v = num(speedVector), k = Math.max(0.5, num(overheadV));
      if (L <= 0 || v <= 0) return { t: 0, gapMm: 0, gapUm: 0, rows: 0 };
      const t = (L / v) * Math.max(1, Math.round(num(passes))) * k;
      return { t, gapMm: 0, gapUm: 0, rows: 0 };
    }
  }, [mode, passes, width, height, dpi, speedRaster, overheadR, length, speedVector, overheadV]);

  return (
    <ToolShell title="Job Time Estimator">
      <Card>
        <CardHeader>
          <CardTitle className="text-base">Mode</CardTitle>
        </CardHeader>
        <CardContent className="grid gap-3 sm:grid-cols-4">
          <label className="text-[11px] sm:text-xs col-span-2 sm:col-span-1">
            <div className="mb-1 text-muted-foreground">Type</div>
            <select
              className="w-full rounded-md border bg-background px-3 py-2 text-sm"
              value={mode}
              onChange={(e) => (setMode(e.target.value as any))}
            >
              <option value="raster">Raster</option>
              <option value="vector">Vector</option>
            </select>
          </label>

          <label className="text-[11px] sm:text-xs">
            <div className="mb-1 text-muted-foreground">Passes</div>
            <Input inputMode="numeric" value={passes} onChange={(e) => setPasses(e.target.value)} />
          </label>
        </CardContent>
      </Card>

      {mode === "raster" ? (
        <Card className="mt-4">
          <CardHeader>
            <CardTitle className="text-base">Raster Inputs</CardTitle>
          </CardHeader>
          <CardContent className="grid gap-3 sm:grid-cols-5">
            <label className="text-[11px] sm:text-xs">
              <div className="mb-1 text-muted-foreground">Width (mm)</div>
              <Input value={width} onChange={(e) => setWidth(e.target.value)} />
            </label>
            <label className="text-[11px] sm:text-xs">
              <div className="mb-1 text-muted-foreground">Height (mm)</div>
              <Input value={height} onChange={(e) => setHeight(e.target.value)} />
            </label>
            <label className="text-[11px] sm:text-xs">
              <div className="mb-1 text-muted-foreground">DPI</div>
              <Input value={dpi} onChange={(e) => setDpi(e.target.value)} />
            </label>
            <label className="text-[11px] sm:text-xs">
              <div className="mb-1 text-muted-foreground">Speed (mm/s)</div>
              <Input value={speedRaster} onChange={(e) => setSpeedRaster(e.target.value)} />
            </label>
            <label className="text-[11px] sm:text-xs">
              <div className="mb-1 text-muted-foreground">Overhead factor</div>
              <Input value={overheadR} onChange={(e) => setOverheadR(e.target.value)} />
            </label>
          </CardContent>
        </Card>
      ) : (
        <Card className="mt-4">
          <CardHeader>
            <CardTitle className="text-base">Vector Inputs</CardTitle>
          </CardHeader>
          <CardContent className="grid gap-3 sm:grid-cols-3">
            <label className="text-[11px] sm:text-xs">
              <div className="mb-1 text-muted-foreground">Total path length (mm)</div>
              <Input value={length} onChange={(e) => setLength(e.target.value)} />
            </label>
            <label className="text-[11px] sm:text-xs">
              <div className="mb-1 text-muted-foreground">Speed (mm/s)</div>
              <Input value={speedVector} onChange={(e) => setSpeedVector(e.target.value)} />
            </label>
            <label className="text-[11px] sm:text-xs">
              <div className="mb-1 text-muted-foreground">Overhead factor</div>
              <Input value={overheadV} onChange={(e) => setOverheadV(e.target.value)} />
            </label>
          </CardContent>
        </Card>
      )}

      <Card className="mt-4">
        <CardHeader>
          <CardTitle className="text-base">Estimate</CardTitle>
        </CardHeader>
        <CardContent className="grid gap-3 sm:grid-cols-3">
          <div>
            <div className="text-sm text-muted-foreground">Estimated time</div>
            <div className="text-lg">{fmtTime(computed.t)}</div>
          </div>
          {mode === "raster" && (
            <>
              <div>
                <div className="text-sm text-muted-foreground">Scan gap</div>
                <div className="text-lg">{computed.gapMm.toFixed(4)} mm</div>
                <div className="text-xs text-muted-foreground">{computed.gapUm.toFixed(1)} µm</div>
              </div>
              <div>
                <div className="text-sm text-muted-foreground">Line count</div>
                <div className="text-lg">{computed.rows.toFixed(0)}</div>
              </div>
            </>
          )}
        </CardContent>
      </Card>

      {/* Footnote */}
      <p className="mt-4 text-xs leading-relaxed text-muted-foreground">
        <span className="font-semibold">Overhead factor*</span> accounts for real-world slowdowns:
        acceleration/decelleration, jump moves, polygon delays, laser on/off timing, overscan,
        bidirectional settle time, and controller latency.{" "}
        <span className="font-semibold">Typical values:</span> Vector cuts/marks{" "}
        <span className="font-medium">1.05–1.15</span> (simple paths, long runs closer to 1.05; tiny
        segments or lots of jumps closer to 1.15). Raster engraving{" "}
        <span className="font-medium">1.10–1.40</span> (lower DPI and long sweeps near 1.10;
        very high DPI or short scan width near 1.30–1.40). Galvo systems often have lower overhead
        at small sizes; gantry systems tend to have higher overhead at high DPI/short strokes.
      </p>
    </ToolShell>
  );
}