import { useState } from "react";
import type {
  OpticsParams,
  OpticsResultType,
  Polarisation,
  RsaParams,
  RsaResultType
} from "../../model/requestTypes";
import { parseLocal } from "../../utils/localTime";
import { DateTime24Field } from "../../components/timeFields";

export type RequestFormSubmit = {
  name: string;
  importance: number;
  beginDateTime: string;
  endDateTime: string;
  kpp: number[];
  highPriorityTransmit: boolean;
  optics?: OpticsParams;
  rsa?: RsaParams;
};

type Props = {
  vertexCount: number;
  drawing: boolean;
  defaultBegin: string;
  defaultEnd: string;
  submitting: boolean;
  error?: string;
  onUndoPoint: () => void;
  onClear: () => void;
  onFinishDrawing: () => void;
  onRestartDrawing: () => void;
  onSubmit: (form: RequestFormSubmit) => void;
  onCancel: () => void;
};

const OPTICS_RESULT_TYPES: { value: OpticsResultType; label: string }[] = [
  { value: "PANCHROMATIC", label: "Панхроматическая" },
  { value: "MULTISPECTRAL", label: "Мультиспектральная" },
  { value: "PANSHARPENING", label: "Паншарпенинг" }
];

const RSA_RESULT_TYPES: { value: RsaResultType; label: string }[] = [
  { value: "SPOTLIGHT", label: "Spotlight" },
  { value: "STRIPMAP", label: "Stripmap" },
  { value: "SCANSAR", label: "ScanSAR" }
];

const POLARISATIONS: { value: Polarisation; label: string }[] = [
  { value: "HH", label: "HH" },
  { value: "VV", label: "VV" }
];

export function RequestCreatePanel({
  vertexCount,
  drawing,
  defaultBegin,
  defaultEnd,
  submitting,
  error,
  onUndoPoint,
  onClear,
  onFinishDrawing,
  onRestartDrawing,
  onSubmit,
  onCancel
}: Props) {
  const [name, setName] = useState("");
  const [importance, setImportance] = useState("1");
  const [begin, setBegin] = useState(defaultBegin);
  const [end, setEnd] = useState(defaultEnd);
  const [kpp, setKpp] = useState("");
  const [highPriority, setHighPriority] = useState(false);

  const [opticsEnabled, setOpticsEnabled] = useState(true);
  const [opticsResultType, setOpticsResultType] = useState<OpticsResultType>("PANCHROMATIC");
  const [opticsResolution, setOpticsResolution] = useState("1");
  const [sunAngleMin, setSunAngleMin] = useState("10");
  const [sunAngleMax, setSunAngleMax] = useState("90");
  const [clouds, setClouds] = useState("100");

  const [rsaEnabled, setRsaEnabled] = useState(false);
  const [rsaResultType, setRsaResultType] = useState<RsaResultType>("STRIPMAP");
  const [interferometry, setInterferometry] = useState(false);
  const [polarisation, setPolarisation] = useState<Polarisation>("HH");
  const [rsaResolution, setRsaResolution] = useState("1");

  const importanceNum = Number(importance);
  const beginMs = parseLocal(begin);
  const endMs = parseLocal(end);

  const kppList = parseKpp(kpp);
  const kppValid = kppList !== null;

  const geometryReady = vertexCount >= 3 && !drawing;

  const validationError = buildValidationError({
    geometryReady,
    drawing,
    vertexCount,
    name,
    importance,
    importanceNum,
    beginMs,
    endMs,
    kppValid,
    opticsEnabled,
    opticsResolution,
    rsaEnabled,
    rsaResolution
  });

  const handleSubmit = () => {
    if (validationError || !kppList) return;
    const optics: OpticsParams | undefined = opticsEnabled
      ? {
          resultType: opticsResultType,
          resolution: Number(opticsResolution),
          sunAngleMin: Number(sunAngleMin),
          sunAngleMax: Number(sunAngleMax),
          clouds: Number(clouds)
        }
      : undefined;
    const rsa: RsaParams | undefined = rsaEnabled
      ? {
          resultType: rsaResultType,
          interferometry,
          polarisation,
          resolution: Number(rsaResolution)
        }
      : undefined;

    onSubmit({
      name: name.trim(),
      importance: importanceNum,
      beginDateTime: begin,
      endDateTime: end,
      kpp: kppList,
      highPriorityTransmit: highPriority,
      optics,
      rsa
    });
  };

  return (
    <aside className="tgu-map-requests-panel tgu-requests-form">
      <div className="tgu-panel-heading">
        <span>Новая заявка</span>
        <button className="tgu-link-button" type="button" onClick={onCancel}>
          Отмена
        </button>
      </div>

      <div className="tgu-requests-form__body">
        <section className="tgu-requests-form__section">
          <div className="tgu-map-panel__label">Геометрия (полигон)</div>
          <div className="tgu-requests-form__hint">
            {drawing
              ? "Кликайте по карте, чтобы добавить вершины. Нажмите «Завершить» (≥3 вершин)."
              : geometryReady
                ? `Полигон задан: ${vertexCount} вершин.`
                : "Полигон не задан."}
          </div>
          <div className="tgu-requests-form__geo-status">Вершин: {vertexCount}</div>
          <div className="tgu-requests-form__actions">
            {drawing ? (
              <>
                <button className="tgu-button tgu-button--sm" type="button" onClick={onUndoPoint} disabled={vertexCount === 0}>
                  Отменить точку
                </button>
                <button className="tgu-button tgu-button--sm" type="button" onClick={onClear} disabled={vertexCount === 0}>
                  Очистить
                </button>
                <button
                  className="tgu-button tgu-button--primary tgu-button--sm"
                  type="button"
                  onClick={onFinishDrawing}
                  disabled={vertexCount < 3}
                >
                  Завершить
                </button>
              </>
            ) : (
              <button className="tgu-button tgu-button--sm" type="button" onClick={onRestartDrawing}>
                Перерисовать
              </button>
            )}
          </div>
        </section>

        <section className="tgu-requests-form__section">
          <div className="tgu-map-panel__label">Параметры заявки</div>
          <label className="tgu-requests-field">
            <span>Название</span>
            <input type="text" value={name} onChange={(e) => setName(e.target.value)} placeholder="Название задания" />
          </label>
          <label className="tgu-requests-field">
            <span>Важность</span>
            <input type="number" min="0" step="0.1" value={importance} onChange={(e) => setImportance(e.target.value)} />
          </label>
          <label className="tgu-requests-field">
            <span>Начало</span>
            <DateTime24Field value={begin} onChange={setBegin} />
          </label>
          <label className="tgu-requests-field">
            <span>Конец</span>
            <DateTime24Field value={end} onChange={setEnd} />
          </label>
          <label className="tgu-requests-field">
            <span>КПП</span>
            <input type="text" value={kpp} onChange={(e) => setKpp(e.target.value)} placeholder="напр. 1, 2, 5" />
          </label>
          <label className="tgu-requests-checkbox">
            <input type="checkbox" checked={highPriority} onChange={(e) => setHighPriority(e.target.checked)} />
            <span>Высокоприоритетная передача</span>
          </label>
        </section>

        <section className="tgu-requests-form__section">
          <label className="tgu-requests-checkbox tgu-requests-form__block-toggle">
            <input type="checkbox" checked={opticsEnabled} onChange={(e) => setOpticsEnabled(e.target.checked)} />
            <span>Оптическая съёмка</span>
          </label>
          {opticsEnabled && (
            <div className="tgu-requests-form__block">
              <label className="tgu-requests-field">
                <span>Результат</span>
                <select value={opticsResultType} onChange={(e) => setOpticsResultType(e.target.value as OpticsResultType)}>
                  {OPTICS_RESULT_TYPES.map((o) => (
                    <option key={o.value} value={o.value}>{o.label}</option>
                  ))}
                </select>
              </label>
              <label className="tgu-requests-field">
                <span>Разрешение, м</span>
                <input type="number" min="0.1" step="0.1" value={opticsResolution} onChange={(e) => setOpticsResolution(e.target.value)} />
              </label>
              <label className="tgu-requests-field">
                <span>Высота Солнца мин, °</span>
                <input type="number" min="0" max="90" step="1" value={sunAngleMin} onChange={(e) => setSunAngleMin(e.target.value)} />
              </label>
              <label className="tgu-requests-field">
                <span>Высота Солнца макс, °</span>
                <input type="number" min="0" max="90" step="1" value={sunAngleMax} onChange={(e) => setSunAngleMax(e.target.value)} />
              </label>
              <label className="tgu-requests-field">
                <span>Облачность макс, %</span>
                <input type="number" min="0" max="100" step="1" value={clouds} onChange={(e) => setClouds(e.target.value)} />
              </label>
            </div>
          )}
        </section>

        <section className="tgu-requests-form__section">
          <label className="tgu-requests-checkbox tgu-requests-form__block-toggle">
            <input type="checkbox" checked={rsaEnabled} onChange={(e) => setRsaEnabled(e.target.checked)} />
            <span>Радиолокационная съёмка (РСА)</span>
          </label>
          {rsaEnabled && (
            <div className="tgu-requests-form__block">
              <label className="tgu-requests-field">
                <span>Тип аппаратуры</span>
                <select value={rsaResultType} onChange={(e) => setRsaResultType(e.target.value as RsaResultType)}>
                  {RSA_RESULT_TYPES.map((o) => (
                    <option key={o.value} value={o.value}>{o.label}</option>
                  ))}
                </select>
              </label>
              <label className="tgu-requests-field">
                <span>Поляризация</span>
                <select value={polarisation} onChange={(e) => setPolarisation(e.target.value as Polarisation)}>
                  {POLARISATIONS.map((o) => (
                    <option key={o.value} value={o.value}>{o.label}</option>
                  ))}
                </select>
              </label>
              <label className="tgu-requests-field">
                <span>Разрешение, м</span>
                <input type="number" min="0.1" step="0.1" value={rsaResolution} onChange={(e) => setRsaResolution(e.target.value)} />
              </label>
              <label className="tgu-requests-checkbox">
                <input type="checkbox" checked={interferometry} onChange={(e) => setInterferometry(e.target.checked)} />
                <span>Интерферометрия</span>
              </label>
            </div>
          )}
        </section>

        {(validationError || error) && (
          <div className="tgu-alert tgu-alert--danger tgu-alert--compact">{error ?? validationError}</div>
        )}
      </div>

      <div className="tgu-requests-form__footer">
        <button
          className="tgu-button tgu-button--primary"
          type="button"
          disabled={submitting || validationError != null}
          onClick={handleSubmit}
        >
          {submitting ? "Создание..." : "Создать заявку"}
        </button>
      </div>
    </aside>
  );
}

function parseKpp(raw: string): number[] | null {
  const trimmed = raw.trim();
  if (trimmed === "") return [];
  const parts = trimmed.split(/[,\s]+/).filter(Boolean);
  const result: number[] = [];
  for (const part of parts) {
    const n = Number(part);
    if (!Number.isInteger(n) || n < 0) return null;
    result.push(n);
  }
  return result;
}

function buildValidationError(input: {
  geometryReady: boolean;
  drawing: boolean;
  vertexCount: number;
  name: string;
  importance: string;
  importanceNum: number;
  beginMs: number;
  endMs: number;
  kppValid: boolean;
  opticsEnabled: boolean;
  opticsResolution: string;
  rsaEnabled: boolean;
  rsaResolution: string;
}): string | null {
  if (input.drawing) return "Завершите рисование полигона (≥3 вершин).";
  if (!input.geometryReady) return "Задайте полигон минимум из 3 вершин.";
  if (input.name.trim() === "") return "Укажите название заявки.";
  if (input.importance.trim() === "" || !Number.isFinite(input.importanceNum) || input.importanceNum < 0) {
    return "Важность должна быть числом ≥ 0.";
  }
  if (!Number.isFinite(input.beginMs) || !Number.isFinite(input.endMs) || input.beginMs >= input.endMs) {
    return "Начало должно быть раньше конца.";
  }
  if (!input.kppValid) return "КПП — список целых чисел через запятую.";
  if (!input.opticsEnabled && !input.rsaEnabled) {
    return "Включите хотя бы один блок съёмки: Оптика или РСА.";
  }
  if (input.opticsEnabled && !(Number(input.opticsResolution) >= 0.1)) {
    return "Разрешение оптики должно быть ≥ 0.1 м.";
  }
  if (input.rsaEnabled && !(Number(input.rsaResolution) >= 0.1)) {
    return "Разрешение РСА должно быть ≥ 0.1 м.";
  }
  return null;
}