"use client";

import React, { FormEvent, useState } from "react";
import type {
  CreateProjectDeviceInput,
  GlobalDeviceDto,
  ProjectDeviceDto,
} from "../types";
import { FormModal } from "./form-modal";
import {
  circuitGroupCategories,
  circuitGroupCategoryLabels,
  type CircuitGroupCategory,
} from "../../shared/constants/circuit-group";
import { GzfPickerModal } from "./gzf-picker-modal";

interface ProjectDeviceModalProps {
  globalDevices: GlobalDeviceDto[];
  initialDevice?: ProjectDeviceDto;
  initialValues?: Partial<CreateProjectDeviceInput>;
  isSaving: boolean;
  onClose: () => void;
  onImportGlobal: (globalDeviceId: string) => Promise<void>;
  onSave: (input: CreateProjectDeviceInput) => Promise<void>;
}

export function ProjectDeviceModal({
  globalDevices,
  initialDevice,
  initialValues,
  isSaving,
  onClose,
  onImportGlobal,
  onSave,
}: ProjectDeviceModalProps) {
  const [values, setValues] = useState(() => toFormValues(initialDevice, initialValues));
  const [selectedGlobalDeviceId, setSelectedGlobalDeviceId] = useState("");
  const [isGzfPickerOpen, setIsGzfPickerOpen] = useState(false);

  function update(key: keyof typeof values, value: string) {
    setValues((current) => ({ ...current, [key]: value }));
  }

  async function handleSubmit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    await onSave({
      name: values.name.trim(),
      displayName: values.displayName.trim() || values.name.trim(),
      connectionKind: optionalString(values.connectionKind),
      costGroup: optionalString(values.costGroup),
      category: values.category as CircuitGroupCategory,
      quantity: parseDecimal(values.quantity),
      powerPerUnit: parseDecimal(values.powerPerUnit),
      simultaneityFactor: parseDecimal(values.simultaneityFactor),
      cosPhi: optionalNumber(values.cosPhi),
      remark: optionalString(values.remark),
    });
  }

  const isValid =
    values.name.trim().length > 0 &&
    isNumberInRange(values.quantity, 0) &&
    isNumberInRange(values.powerPerUnit, 0) &&
    isNumberInRange(values.simultaneityFactor, 0, 1) &&
    (!values.cosPhi.trim() || isNumberInRange(values.cosPhi, 0, 1));

  return (
    <>
    <FormModal
      description={
        initialDevice
          ? "Kanonische Gerätedaten bearbeiten; verknüpfte Stromkreiszeilen werden nicht automatisch überschrieben."
          : "Ein Gerät manuell anlegen oder aus der globalen Bibliothek übernehmen."
      }
      isSaving={isSaving}
      onClose={onClose}
      onSubmit={handleSubmit}
      submitDisabled={!isValid}
      submitLabel={initialDevice ? "Änderungen speichern" : "Gerät anlegen"}
      title={initialDevice ? "Projektgerät bearbeiten" : "Projektgerät hinzufügen"}
    >
      {!initialDevice && globalDevices.length > 0 ? (
        <div className="border rounded p-3 mb-4">
          <label className="form-label" htmlFor="global-project-device">
            Aus globaler Gerätebibliothek
          </label>
          <div className="input-group">
            <select
              className="form-select"
              id="global-project-device"
              onChange={(event) => setSelectedGlobalDeviceId(event.target.value)}
              value={selectedGlobalDeviceId}
            >
              <option value="">Gerät auswählen</option>
              {globalDevices.map((device) => (
                <option key={device.id} value={device.id}>
                  {device.displayName}
                </option>
              ))}
            </select>
            <button
              className="btn btn-outline-primary"
              disabled={isSaving || !selectedGlobalDeviceId}
              onClick={() => void onImportGlobal(selectedGlobalDeviceId)}
              type="button"
            >
              Übernehmen
            </button>
          </div>
        </div>
      ) : null}

      <div className="row g-3">
        <TextField
          id="device-name"
          label="Interner Name"
          onChange={(value) => update("name", value)}
          required
          value={values.name}
        />
        <TextField
          id="device-display-name"
          label="Anzeigename"
          onChange={(value) => update("displayName", value)}
          value={values.displayName}
        />
        <div className="col-12 col-md-6">
          <label className="form-label" htmlFor="device-category">
            Kategorie
          </label>
          <select
            className="form-select"
            id="device-category"
            onChange={(event) =>
              update("category", event.target.value as CircuitGroupCategory)
            }
            value={values.category}
          >
            {circuitGroupCategories.map((category) => (
              <option key={category} value={category}>
                {circuitGroupCategoryLabels[category]}
              </option>
            ))}
          </select>
        </div>
        <TextField
          id="device-connection"
          label="Anschlussart"
          onChange={(value) => update("connectionKind", value)}
          value={values.connectionKind}
        />
        <TextField
          id="device-cost-group"
          label="Kostengruppe"
          onChange={(value) => update("costGroup", value)}
          value={values.costGroup}
        />
        <NumberField
          id="device-quantity"
          label="Anzahl"
          min="0"
          onChange={(value) => update("quantity", value)}
          value={values.quantity}
        />
        <NumberField
          id="device-power"
          label="Leistung je Stück [kW]"
          min="0"
          onChange={(value) => update("powerPerUnit", value)}
          step="0.01"
          value={values.powerPerUnit}
        />
        <div className="col-12 col-md-6">
          <label className="form-label" htmlFor="device-simultaneity">
            Gleichzeitigkeitsfaktor
          </label>
          <div className="input-group">
            <input
              className="form-control"
              id="device-simultaneity"
              max="1"
              min="0"
              onChange={(event) => update("simultaneityFactor", event.target.value)}
              step="0.01"
              type="number"
              value={values.simultaneityFactor}
            />
            <button
              className="btn btn-outline-primary"
              onClick={() => setIsGzfPickerOpen(true)}
              title="Gleichzeitigkeitsfaktor nach AMEV wählen"
              type="button"
            >
              AMEV
            </button>
          </div>
        </div>
        <NumberField
          id="device-cos-phi"
          label="cos Phi"
          max="1"
          min="0"
          onChange={(value) => update("cosPhi", value)}
          step="0.01"
          value={values.cosPhi}
        />
        <div className="col-12">
          <label className="form-label" htmlFor="device-remark">
            Bemerkung
          </label>
          <textarea
            className="form-control"
            id="device-remark"
            onChange={(event) => update("remark", event.target.value)}
            rows={3}
            value={values.remark}
          />
        </div>
      </div>
    </FormModal>
    {isGzfPickerOpen ? (
      <GzfPickerModal
        onClose={() => setIsGzfPickerOpen(false)}
        onSelect={(value) => {
          update("simultaneityFactor", String(value));
          setIsGzfPickerOpen(false);
        }}
      />
    ) : null}
    </>
  );
}

interface FieldProps {
  id: string;
  label: string;
  onChange: (value: string) => void;
  required?: boolean;
  value: string;
}

function TextField({ id, label, onChange, required, value }: FieldProps) {
  return (
    <div className="col-12 col-md-6">
      <label className="form-label" htmlFor={id}>
        {label}
      </label>
      <input
        className="form-control"
        id={id}
        onChange={(event) => onChange(event.target.value)}
        required={required}
        value={value}
      />
    </div>
  );
}

function NumberField({
  id,
  label,
  max,
  min,
  onChange,
  step,
  value,
}: FieldProps & { max?: string; min?: string; step?: string }) {
  return (
    <div className="col-12 col-md-6">
      <label className="form-label" htmlFor={id}>
        {label}
      </label>
      <input
        className="form-control"
        id={id}
        max={max}
        min={min}
        onChange={(event) => onChange(event.target.value)}
        step={step}
        inputMode="decimal"
        type="text"
        value={value}
      />
    </div>
  );
}

function toFormValues(
  device?: ProjectDeviceDto,
  initialValues?: Partial<CreateProjectDeviceInput>
) {
  return {
    name: device?.name ?? initialValues?.name ?? "",
    displayName: device?.displayName ?? initialValues?.displayName ?? "",
    connectionKind: device?.connectionKind ?? initialValues?.connectionKind ?? "",
    costGroup: device?.costGroup ?? initialValues?.costGroup ?? "",
    category: device?.category ?? initialValues?.category ?? "single_phase",
    quantity: String(device?.quantity ?? initialValues?.quantity ?? 1),
    powerPerUnit: String(device?.powerPerUnit ?? initialValues?.powerPerUnit ?? 0.1),
    simultaneityFactor: String(device?.simultaneityFactor ?? initialValues?.simultaneityFactor ?? 1),
    cosPhi: String(device?.cosPhi ?? initialValues?.cosPhi ?? 1),
    remark: device?.remark ?? initialValues?.remark ?? "",
  };
}

function optionalString(value: string) {
  return value.trim() || undefined;
}

function optionalNumber(value: string) {
  return value.trim() ? parseDecimal(value) : undefined;
}

function parseDecimal(value: string) {
  return Number(value.trim().replace(",", "."));
}

function isNumberInRange(value: string, min: number, max = Number.POSITIVE_INFINITY) {
  const parsed = parseDecimal(value);
  return Number.isFinite(parsed) && parsed >= min && parsed <= max;
}