"use client";

import { useEffect, useMemo, useState } from "react";
import { useForm, useFieldArray, type UseFormRegister } from "react-hook-form";

/** ─────────────────────────────────────────────────────────────
 * Client form:
 *  - Custom file inputs (photo required, screen optional) with previews
 *  - Posts multipart/form-data: { payload: JSON, photo?: File, screen?: File }
 *  - Accepts id/submission_id in response
 * ──────────────────────────────────────────────────────────── */

type Target = "settings_fiber" | "settings_co2gan" | "settings_co2gal" | "settings_uv";
type Opt = { id: string; label: string };

function useOptions(path: string) {
  const [opts, setOpts] = useState<Opt[]>([]);
  const [loading, setLoading] = useState(false);
  const [q, setQ] = useState("");

  useEffect(() => {
    let alive = true;
    setLoading(true);
    const url = `/api/options/${path}${path.includes("?") ? "&" : "?"}q=${encodeURIComponent(q)}`;
    fetch(url, { cache: "no-store" })
      .then((r) => r.json())
      .then((j) => { if (alive) setOpts((j?.data as Opt[]) ?? []); })
      .catch(() => { if (alive) setOpts([]); })
      .finally(() => { if (alive) setLoading(false); });
    return () => { alive = false; };
  }, [path, q]);

  return { opts, loading, setQ };
}

function FilterableSelect({
  label, name, register, options, loading, onQuery, placeholder = "—", required,
}: {
  label: string;
  name: string;
  register: UseFormRegister<any>;
  options: Opt[];
  loading?: boolean;
  onQuery?: (q: string) => void;
  placeholder?: string;
  required?: boolean;
}) {
  const [filter, setFilter] = useState("");
  useEffect(() => { onQuery?.(filter); }, [filter, onQuery]);

  const filtered = useMemo(() => {
    if (!filter) return options;
    const f = filter.toLowerCase();
    return options.filter((o) => o.label.toLowerCase().includes(f));
  }, [options, filter]);

  return (
    <div>
      <label className="block text-sm mb-1">{label}{required ? " *" : ""}</label>
      <input
        className="w-full border rounded px-2 py-1 mb-1"
        placeholder="Type to filter…"
        value={filter}
        onChange={(e) => setFilter(e.target.value)}
      />
      <select className="w-full border rounded px-2 py-1" {...register(name, { required })}>
        <option value="">{placeholder}{loading ? " (loading…)" : ""}</option>
        {filtered.map((o) => <option key={o.id} value={o.id}>{o.label}</option>)}
      </select>
    </div>
  );
}

/** Custom file input with preview + filename display */
function FileInput({
  label,
  required,
  onFile,
  maxMB = 25,
  accept = "image/*",
  initialPreview,
}: {
  label: string;
  required?: boolean;
  onFile: (f: File | null) => void;
  maxMB?: number;
  accept?: string;
  initialPreview?: string | null;
}) {
  const [file, setFile] = useState<File | null>(null);
  const [preview, setPreview] = useState<string | null>(initialPreview ?? null);
  const [name, setName] = useState<string>("");

  function pick(e: React.ChangeEvent<HTMLInputElement>) {
    const f = e.target.files?.[0] ?? null;
    setFile(f);
    setName(f ? f.name : "");
    onFile(f);
    if (f) {
      const url = URL.createObjectURL(f);
      setPreview(url);
    } else {
      setPreview(null);
    }
  }

  return (
    <div>
      <label className="block text-sm mb-1">
        {label}{required ? " *" : ""}
      </label>

      {/* Hide the native text; instead show our own button + filename */}
      <div className="flex items-center gap-3 mb-1">
        <label className="inline-block px-2 py-1 border rounded cursor-pointer">
          Choose File
          <input
            type="file"
            accept={accept}
            onChange={pick}
            // hide the native control, keep it accessible
            className="sr-only"
          />
        </label>
        <span className="text-xs text-muted-foreground">
          {file ? `Selected: ${name}` : "No file selected"}
        </span>
      </div>

      <p className="text-xs text-muted-foreground mb-2">Max {maxMB} MB. JPG/PNG/WebP recommended.</p>

      {preview && (
        <img
          src={preview}
          alt="preview"
          className="block w-full max-w-[420px] rounded border"
        />
      )}

      {/* Simple required guard text (we enforce in onSubmit too) */}
      {required && !file && (
        <p className="text-xs text-red-500 mt-1">This image is required.</p>
      )}
    </div>
  );
}

function BoolBox({ label, name, register }:{
  label: string; name: string; register: UseFormRegister<any>;
}) {
  return (
    <label className="flex items-center gap-1 text-sm">
      <input type="checkbox" {...register(name)} /> {label}
    </label>
  );
}

export default function SettingsSubmit({ initialTarget }: { initialTarget?: Target }) {
  const [target, setTarget] = useState<Target>(initialTarget ?? "settings_fiber");

  // Custom file states
  const [photoFile, setPhotoFile] = useState<File | null>(null);
  const [screenFile, setScreenFile] = useState<File | null>(null);

  // Generic lists (alphabetical)
  const mats   = useOptions("material");
  const coats  = useOptions("material_coating");
  const colors = useOptions("material_color");
  const opacs  = useOptions("material_opacity");
  const soft   = useOptions("laser_software"); // only visible for fiber

  // Target-driven lists
  const srcs  = useOptions(`laser_source?target=${target}`); // wavelength filter server-side
  const lens  = useOptions(`lens?target=${target}`);         // scan vs focus lens by target

  // Repeater select choices from Directus field config
  const fillType     = useOptions(`repeater-choices?target=${target}&group=fill_settings&field=type`);
  const rasterType   = useOptions(`repeater-choices?target=${target}&group=raster_settings&field=type`);
  const rasterDither = useOptions(`repeater-choices?target=${target}&group=raster_settings&field=dither`);

  const {
    register,
    handleSubmit,
    control,
    reset,
    formState: { isSubmitting },
  } = useForm<any>({
    defaultValues: {
      setting_title: "", uploader: "", setting_notes: "",
      mat: "", mat_coat: "", mat_color: "", mat_opacity: "",
      mat_thickness: "", source: "", lens: "", focus: "",
      laser_soft: "", repeat_all: "",
      fill_settings: [], line_settings: [], raster_settings: [],
    },
  });

  const fills   = useFieldArray({ control, name: "fill_settings" });
  const lines   = useFieldArray({ control, name: "line_settings" });
  const rasters = useFieldArray({ control, name: "raster_settings" });

  const isGantry = target === "settings_co2gan";
  const isFiber  = target === "settings_fiber";

  function num(v: any) { return (v === "" || v == null) ? null : Number(v); }
  const bool = (v: any) => !!v;

  async function onSubmit(values: any) {
    // enforce photo required on client
    if (!photoFile) {
      alert("Result Photo is required.");
      return;
    }

    const payload: any = {
      target,
      setting_title: values.setting_title,
      uploader: values.uploader,
      setting_notes: values.setting_notes || "",

      // relations / numbers
      mat: values.mat || null,
      mat_coat: values.mat_coat || null,
      mat_color: values.mat_color || null,
      mat_opacity: values.mat_opacity || null,
      mat_thickness: num(values.mat_thickness),
      source: values.source || null,
      lens: values.lens || null,
      focus: num(values.focus),

      // repeaters
      fill_settings: (values.fill_settings || []).map((r: any) => ({
        name: r.name || "",
        power: num(r.power),
        speed: num(r.speed),
        interval: num(r.interval),
        pass: num(r.pass),
        type: r.type || "",
        frequency: num(r.frequency),
        pulse: num(r.pulse),
        angle: num(r.angle),
        auto: bool(r.auto),
        increment: num(r.increment),
        cross: bool(r.cross),
        flood: bool(r.flood),
        air: bool(r.air),
      })),
      line_settings: (values.line_settings || []).map((r: any) => ({
        name: r.name || "",
        power: num(r.power),
        speed: num(r.speed),
        perf: bool(r.perf),
        cut: r.cut || "",
        skip: r.skip || "",
        pass: num(r.pass),
        air: bool(r.air),
        frequency: num(r.frequency),
        pulse: num(r.pulse),
        wobble: bool(r.wobble),
        step: num(r.step),
        size: num(r.size),
      })),
      raster_settings: (values.raster_settings || []).map((r: any) => ({
        name: r.name || "",
        power: num(r.power),
        speed: num(r.speed),
        type: r.type || "",
        dither: r.dither || "",
        halftone_cell: num(r.halftone_cell),
        halftone_angle: num(r.halftone_angle),
        inversion: bool(r.inversion),
        interval: num(r.interval),
        dot: num(r.dot),
        pass: num(r.pass),
        air: bool(r.air),
        frequency: num(r.frequency),
        pulse: num(r.pulse),
        cross: bool(r.cross),
      })),
    };

    if (isFiber) {
      payload.laser_soft = values.laser_soft || null;
      payload.repeat_all = num(values.repeat_all);
    }

    const fd = new FormData();
    fd.append("payload", JSON.stringify(payload));
    if (photoFile) fd.append("photo", photoFile, photoFile.name);
    if (screenFile) fd.append("screen", screenFile, screenFile.name);

    const res = await fetch("/api/submit/settings", {
      method: "POST",
      body: fd,
    });

    let data: any = {};
    try {
      data = await res.json();
    } catch {
      // no-op; keep empty data
    }

    if (!res.ok) {
      const msg = data?.error || "Submission failed";
      alert(`Submission failed: ${msg}`);
      return;
    }

    const id =
      data?.id ??
      data?.submission_id ??
      data?.data?.id ??
      data?.data?.submission_id ??
      data?.itemId ??
      "(unknown)";

    reset();
    setPhotoFile(null);
    setScreenFile(null);
    alert(`Submitted! ID: ${id}`);
  }

  return (
    <div className="max-w-4xl mx-auto space-y-4">
      <div className="flex flex-wrap gap-3 items-end">
        <div>
          <label className="block text-sm mb-1">Target</label>
          <select
            className="border rounded px-2 py-1"
            value={target}
            onChange={(e) => setTarget(e.target.value as Target)}
          >
            <option value="settings_fiber">Fiber</option>
            <option value="settings_co2gan">CO₂ Gantry</option>
            <option value="settings_co2gal">CO₂ Galvo</option>
            <option value="settings_uv">UV</option>
          </select>
        </div>

        {isFiber && (
          <div className="flex-1 min-w-[220px]">
            <FilterableSelect
              label="Software"
              name="laser_soft"
              register={register}
              options={soft.opts}
              loading={soft.loading}
              onQuery={soft.setQ}
              required
            />
          </div>
        )}
      </div>

      <form onSubmit={handleSubmit(onSubmit)} className="space-y-4">
        <div className="grid md:grid-cols-2 gap-3">
          <div>
            <label className="block text-sm mb-1">Title *</label>
            <input className="w-full border rounded px-2 py-1" {...register("setting_title", { required: true })} />
          </div>
          <div>
            <label className="block text-sm mb-1">Uploader *</label>
            <input className="w-full border rounded px-2 py-1" {...register("uploader", { required: true })} />
          </div>
        </div>

        <div>
          <label className="block text-sm mb-1">Notes</label>
          <textarea rows={4} className="w-full border rounded px-2 py-1" {...register("setting_notes")} />
        </div>

        {/* Files */}
        <div className="grid md:grid-cols-2 gap-6">
          <FileInput
            label="Result Photo"
            required
            onFile={setPhotoFile}
          />
          <FileInput
            label="Settings Screenshot (optional)"
            onFile={setScreenFile}
          />
        </div>

        <div className="grid md:grid-cols-2 gap-3">
          <FilterableSelect label="Material"       name="mat"         register={register} options={mats.opts}   loading={mats.loading}   onQuery={mats.setQ}   required />
          <FilterableSelect label="Coating"        name="mat_coat"    register={register} options={coats.opts}  loading={coats.loading}  onQuery={coats.setQ}  required />
          <FilterableSelect label="Color"          name="mat_color"   register={register} options={colors.opts} loading={colors.loading} onQuery={colors.setQ} required />
          <FilterableSelect label="Opacity"        name="mat_opacity" register={register} options={opacs.opts}  loading={opacs.loading}  onQuery={opacs.setQ}  required />
          <FilterableSelect label="Laser Source"   name="source"      register={register} options={srcs.opts}   loading={srcs.loading}   onQuery={srcs.setQ}   required />
          <FilterableSelect label="Lens"           name="lens"        register={register} options={lens.opts}   loading={lens.loading}   onQuery={lens.setQ}   required />
        </div>

        <div className="grid md:grid-cols-3 gap-3">
          <div>
            <label className="block text-sm mb-1">Material Thickness (mm)</label>
            <input type="number" step="0.01" className="w-full border rounded px-2 py-1" {...register("mat_thickness")} />
          </div>
          <div>
            <label className="block text-sm mb-1">Focus (mm) *</label>
            <input type="number" min={-10} max={10} step="1" className="w-full border rounded px-2 py-1" {...register("focus", { required: true })} />
            <p className="text-xs text-muted-foreground mt-1">
              0 = in focus. Negative = focus closer. Positive = focus further.
            </p>
          </div>
          {isFiber && (
            <div>
              <label className="block text-sm mb-1">Repeat All *</label>
              <input type="number" step="1" className="w-full border rounded px-2 py-1" {...register("repeat_all", { required: true })} />
            </div>
          )}
        </div>

        {/* FILL */}
        <fieldset className="border rounded p-3 space-y-2">
          <div className="flex items-center justify-between">
            <legend className="font-semibold">Fill Settings</legend>
            <button type="button" className="px-2 py-1 border rounded" onClick={() => fills.append({})}>+ Add</button>
          </div>
          {fills.fields.map((f, i) => (
            <div key={f.id} className="grid md:grid-cols-4 gap-2">
              <input placeholder="Name" className="border rounded px-2 py-1 md:col-span-2" {...register(`fill_settings.${i}.name`)} />
              <FilterableSelect
                label="Type"
                name={`fill_settings.${i}.type`}
                register={register}
                options={fillType.opts}
                loading={fillType.loading}
                onQuery={fillType.setQ}
                placeholder="Select type"
              />
              {!isGantry && (
                <>
                  <input placeholder="Frequency (kHz)" type="number" step="0.1" className="border rounded px-2 py-1" {...register(`fill_settings.${i}.frequency`)} />
                  <input placeholder="Pulse (ns)" type="number" step="0.1" className="border rounded px-2 py-1" {...register(`fill_settings.${i}.pulse`)} />
                </>
              )}
              <input placeholder="Power (%)"       type="number" step="0.1"   className="border rounded px-2 py-1" {...register(`fill_settings.${i}.power`)} />
              <input placeholder="Speed (mm/s)"    type="number" step="0.1"   className="border rounded px-2 py-1" {...register(`fill_settings.${i}.speed`)} />
              <input placeholder="Interval (mm)"   type="number" step="0.001" className="border rounded px-2 py-1" {...register(`fill_settings.${i}.interval`)} />
              <input placeholder="Pass"            type="number" step="1"     className="border rounded px-2 py-1" {...register(`fill_settings.${i}.pass`)} />
              {!isGantry && (
                <>
                  <input placeholder="Angle (°)" type="number" step="1" className="border rounded px-2 py-1" {...register(`fill_settings.${i}.angle`)} />
                  <input placeholder="Increment"  type="number" step="0.001" className="border rounded px-2 py-1" {...register(`fill_settings.${i}.increment`)} />
                  <div className="flex items-center gap-3">
                    <BoolBox label="Auto"  name={`fill_settings.${i}.auto`}  register={register} />
                    <BoolBox label="Cross" name={`fill_settings.${i}.cross`} register={register} />
                  </div>
                </>
              )}
              <div className="flex items-center gap-3">
                <BoolBox label="Flood" name={`fill_settings.${i}.flood`} register={register} />
                <BoolBox label="Air"   name={`fill_settings.${i}.air`}   register={register} />
              </div>
              <button type="button" className="px-2 py-1 border rounded md:col-span-4" onClick={() => fills.remove(i)}>Remove</button>
            </div>
          ))}
        </fieldset>

        {/* LINE */}
        <fieldset className="border rounded p-3 space-y-2">
          <div className="flex items-center justify-between">
            <legend className="font-semibold">Line Settings</legend>
            <button type="button" className="px-2 py-1 border rounded" onClick={() => lines.append({})}>+ Add</button>
          </div>
          {lines.fields.map((f, i) => (
            <div key={f.id} className="grid md:grid-cols-4 gap-2">
              <input placeholder="Name" className="border rounded px-2 py-1 md:col-span-2" {...register(`line_settings.${i}.name`)} />
              {!isGantry && (
                <>
                  <input placeholder="Frequency (kHz)" type="number" step="0.1" className="border rounded px-2 py-1" {...register(`line_settings.${i}.frequency`)} />
                  <input placeholder="Pulse (ns)"      type="number" step="0.1" className="border rounded px-2 py-1" {...register(`line_settings.${i}.pulse`)} />
                </>
              )}
              <input placeholder="Power (%)"     type="number" step="0.1" className="border rounded px-2 py-1" {...register(`line_settings.${i}.power`)} />
              <input placeholder="Speed (mm/s)"  type="number" step="0.1" className="border rounded px-2 py-1" {...register(`line_settings.${i}.speed`)} />
              <input placeholder="Perf" className="border rounded px-2 py-1" {...register(`line_settings.${i}.perf`)} />
              <input placeholder="Cut"  className="border rounded px-2 py-1" {...register(`line_settings.${i}.cut`)} />
              <input placeholder="Skip" className="border rounded px-2 py-1" {...register(`line_settings.${i}.skip`)} />
              <input placeholder="Pass" type="number" step="1" className="border rounded px-2 py-1" {...register(`line_settings.${i}.pass`)} />
              {!isGantry && (
                <>
                  <input placeholder="Step" type="number" step="0.001" className="border rounded px-2 py-1" {...register(`line_settings.${i}.step`)} />
                  <input placeholder="Size" type="number" step="0.001" className="border rounded px-2 py-1" {...register(`line_settings.${i}.size`)} />
                  <BoolBox label="Wobble" name={`line_settings.${i}.wobble`} register={register} />
                </>
              )}
              <BoolBox label="Air" name={`line_settings.${i}.air`} register={register} />
              <button type="button" className="px-2 py-1 border rounded md:col-span-4" onClick={() => lines.remove(i)}>Remove</button>
            </div>
          ))}
        </fieldset>

        {/* RASTER */}
        <fieldset className="border rounded p-3 space-y-2">
          <div className="flex items-center justify-between">
            <legend className="font-semibold">Raster Settings</legend>
            <button type="button" className="px-2 py-1 border rounded" onClick={() => rasters.append({})}>+ Add</button>
          </div>
          {rasters.fields.map((f, i) => (
            <div key={f.id} className="grid md:grid-cols-4 gap-2">
              <input placeholder="Name" className="border rounded px-2 py-1 md:col-span-2" {...register(`raster_settings.${i}.name`)} />
              {!isGantry && (
                <>
                  <input placeholder="Frequency (kHz)" type="number" step="0.1" className="border rounded px-2 py-1" {...register(`raster_settings.${i}.frequency`)} />
                  <input placeholder="Pulse (ns)"      type="number" step="0.1" className="border rounded px-2 py-1" {...register(`raster_settings.${i}.pulse`)} />
                </>
              )}
              <FilterableSelect
                label="Type"
                name={`raster_settings.${i}.type`}
                register={register}
                options={rasterType.opts}
                loading={rasterType.loading}
                onQuery={rasterType.setQ}
                placeholder="Select type"
              />
              <FilterableSelect
                label="Dither"
                name={`raster_settings.${i}.dither`}
                register={register}
                options={rasterDither.opts}
                loading={rasterDither.loading}
                onQuery={rasterDither.setQ}
                placeholder="Select dither"
              />
              <input placeholder="Power (%)"       type="number" step="0.1"   className="border rounded px-2 py-1" {...register(`raster_settings.${i}.power`)} />
              <input placeholder="Speed (mm/s)"    type="number" step="0.1"   className="border rounded px-2 py-1" {...register(`raster_settings.${i}.speed`)} />
              <input placeholder="Halftone Cell"   type="number" step="1"     className="border rounded px-2 py-1" {...register(`raster_settings.${i}.halftone_cell`)} />
              <input placeholder="Halftone Angle"  type="number" step="1"     className="border rounded px-2 py-1" {...register(`raster_settings.${i}.halftone_angle`)} />
              <input placeholder="Interval (mm)"   type="number" step="0.001" className="border rounded px-2 py-1" {...register(`raster_settings.${i}.interval`)} />
              <input placeholder="Dot"             type="number" step="0.1"   className="border rounded px-2 py-1" {...register(`raster_settings.${i}.dot`)} />
              <input placeholder="Pass"            type="number" step="1"     className="border rounded px-2 py-1" {...register(`raster_settings.${i}.pass`)} />
              {!isGantry && <BoolBox label="Cross" name={`raster_settings.${i}.cross`} register={register} />}
              <div className="flex items-center gap-3">
                <BoolBox label="Inversion" name={`raster_settings.${i}.inversion`} register={register} />
                <BoolBox label="Air"       name={`raster_settings.${i}.air`}       register={register} />
              </div>
              <button type="button" className="px-2 py-1 border rounded md:col-span-4" onClick={() => rasters.remove(i)}>Remove</button>
            </div>
          ))}
        </fieldset>

        <button
          disabled={isSubmitting}
          className="px-3 py-2 border rounded bg-accent text-background hover:opacity-90 disabled:opacity-50"
        >
          {isSubmitting ? "Submitting…" : "Submit Settings"}
        </button>
      </form>
    </div>
  );
}