"use client";

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

/** Targets map 1:1 with your Directus collections */
type Target = "settings_fiber" | "settings_co2gan" | "settings_co2gal" | "settings_uv";
type Opt = { id: string; label: string };

/* ─────────────────────────────────────────────────────────────
 * Generic hook to fetch options with client-side filter
 * Expects endpoint to return: { data: Array<{id,label}> }
 * ──────────────────────────────────────────────────────────── */
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 };
}

/* ─────────────────────────────────────────────────────────────
 * Filterable select with optional "required" client rule
 * ──────────────────────────────────────────────────────────── */
function FilterableSelect({
  label, name, register, options, loading, onQuery, placeholder = "—", required = false,
}: {
  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 && <span className="text-red-500"> *</span>}</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 ? { required: true } : undefined)}>
    <option value="">{placeholder}{loading ? " (loading…)" : ""}</option>
    {filtered.map((o) => <option key={o.id} value={o.id}>{o.label}</option>)}
    </select>
    </div>
  );
}

/* ─────────────────────────────────────────────────────────────
 * Checkbox
 * ──────────────────────────────────────────────────────────── */
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>
  );
}

/* ─────────────────────────────────────────────────────────────
 * Polished File Picker (with preview + filename)
 * NOT registered into RHF; managed via local state.
 * Use `onFile` to push the selected File up to the parent.
 * ──────────────────────────────────────────────────────────── */
function FilePicker({
  label,
  required,
  onFile,
  accept,
}: {
  label: string;
  required?: boolean;
  onFile: (f: File | null) => void;
  accept?: string;
}) {
  const [file, setFile] = useState<File | null>(null);
  const [url, setUrl] = useState<string | null>(null);

  function handleChange(e: React.ChangeEvent<HTMLInputElement>) {
    const f = e.target.files?.[0] || null;
    setFile(f);
    onFile(f);
    if (url) URL.revokeObjectURL(url);
    setUrl(f ? URL.createObjectURL(f) : null);
  }

  function clear() {
    setFile(null);
    onFile(null);
    if (url) URL.revokeObjectURL(url);
    setUrl(null);
  }

  const inputId = `fp-${label.replace(/\s+/g, "-").toLowerCase()}`;

  return (
    <div className="space-y-2">
    <div className="flex items-center justify-between">
    <label htmlFor={inputId} className="block text-sm">
    {label}{required && <span className="text-red-500"> *</span>}
    </label>
    {file && (
      <button type="button" onClick={clear} className="text-sm underline">
      Remove
      </button>
    )}
    </div>

    {/* visually hidden native input; we present a custom button */}
    <input
    id={inputId}
    type="file"
    accept={accept}
    className="sr-only"
    onChange={handleChange}
    />
    <div className="flex items-center gap-3">
    <label htmlFor={inputId} className="px-2 py-1 border rounded cursor-pointer inline-block">
    Choose file
    </label>
    <div className="text-sm text-muted-foreground">
    {file ? file.name : "No file chosen"}
    </div>
    </div>

    {url && (
      <div className="border rounded p-2">
      {/* eslint-disable-next-line @next/next/no-img-element */}
      <img src={url} alt={`${label} preview`} className="max-h-48 object-contain mx-auto" />
      </div>
    )}
    </div>
  );
}

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

  // 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, errors } } = 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";

  // file state (not part of RHF)
  const [photoFile, setPhotoFile] = useState<File | null>(null);
  const [screenFile, setScreenFile] = useState<File | null>(null);
  const [submitMsg, setSubmitMsg] = useState<{ ok: boolean; text: string } | null>(null);

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

  async function onSubmit(values: any) {
    setSubmitMsg(null);

    // client-side requireds (extra guardrails)
    const missing: string[] = [];
    if (!photoFile) missing.push("photo");
    if (!values.source) missing.push("laser source");
    if (!values.lens) missing.push("lens");
    if (values.focus === "" || values.focus === undefined || values.focus === null) missing.push("focus");
    for (const k of ["mat","mat_coat","mat_color","mat_opacity"]) {
      if (!values[k]) missing.push(k);
    }
    if (!values.setting_title) missing.push("title");
    if (!values.uploader) missing.push("uploader");
    if (isFiber) {
      if (!values.laser_soft) missing.push("software");
      if (values.repeat_all === "" || values.repeat_all === undefined || values.repeat_all === null) missing.push("repeat_all");
    }
    if (missing.length) {
      setSubmitMsg({ ok: false, text: `Missing required field(s): ${missing.join(", ")}` });
      return;
    }

    // Build server payload (numbers coerced on server too)
    const payload: any = {
      target,
      setting_title: values.setting_title,
      uploader: values.uploader,
      setting_notes: values.setting_notes || "",
      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),

      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 || "",
                                                                   // present on fiber/uv/co2gal
                                                                   frequency: num(r.frequency),
                                                                   pulse: num(r.pulse),
                                                                   angle: num(r.angle),
                                                                   auto: bool(r.auto),
                                                                   increment: num(r.increment),
                                                                   cross: bool(r.cross),
                                                                   // present on all
                                                                   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),
                                                                   // extra on fiber/uv/co2gal
                                                                   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),
                                                                       // extras on fiber/uv/co2gal
                                                                       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);
    }

    // Use multipart/form-data with JSON payload + files
    const form = new FormData();
    form.set("payload", JSON.stringify(payload));
    if (photoFile) form.set("photo", photoFile, photoFile.name);
    if (screenFile) form.set("screen", screenFile, screenFile.name);

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

    const text = await res.text();
    let data: any = {};
    try { data = text ? JSON.parse(text) : {}; } catch { /* non-JSON error page */ }

    if (!res.ok) {
      setSubmitMsg({ ok: false, text: `Submission failed: ${data?.error || res.statusText}` });
      return;
    }

    setSubmitMsg({ ok: true, text: `Submitted! ID: ${data?.id ?? "unknown"}` });

    // reset form (keep target)
    reset({
      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: [],
    });
    setPhotoFile(null);
    setScreenFile(null);
  }

  return (
    <div className="max-w-3xl 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-6">
    {/* identity */}
    <div className="grid md:grid-cols-2 gap-3">
    <div>
    <label className="block text-sm mb-1">Title <span className="text-red-500">*</span></label>
    <input className="w-full border rounded px-2 py-1" {...register("setting_title", { required: true })} />
    {errors.setting_title && <p className="text-xs text-red-600 mt-1">Title is required</p>}
    </div>
    <div>
    <label className="block text-sm mb-1">Uploader <span className="text-red-500">*</span></label>
    <input className="w-full border rounded px-2 py-1" {...register("uploader", { required: true })} />
    {errors.uploader && <p className="text-xs text-red-600 mt-1">Uploader is required</p>}
    </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>

    {/* materials & system */}
    <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) <span className="text-red-500">*</span></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 <span className="text-red-500">*</span></label>
      <input type="number" step="1" className="w-full border rounded px-2 py-1" {...register("repeat_all", { required: true })} />
      </div>
    )}
    </div>

    {/* images */}
    <div className="grid md:grid-cols-2 gap-6">
    <FilePicker label="Result Photo" required accept="image/*" onFile={setPhotoFile} />
    <FilePicker label="Settings Screenshot (optional)" accept="image/*" onFile={setScreenFile} />
    </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`)} />
      <div className="flex items-center gap-3">
      <BoolBox label="Perf" name={`line_settings.${i}.perf`} register={register} />
      <BoolBox label="Air"  name={`line_settings.${i}.air`}  register={register} />
      </div>
      {!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.${i}.wobble`} register={register} />
        </>
      )}
      <input placeholder="Cut"  className="border rounded px-2 py-1" {...register(`line_settings.${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`)} />

      <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>

    {/* submit */}
    {submitMsg && (
      <div className={`p-2 rounded text-sm ${submitMsg.ok ? "bg-green-100 text-green-800" : "bg-red-100 text-red-800"}`}>
      {submitMsg.text}
      </div>
    )}

    <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>
  );
}