"use client";

import { useState } from "react";

import type {
  HouseType,
  RepairState,
  TradeInEstimateInput,
} from "@/types/trade-in";
import { AddressInput } from "@/components/trade-in/AddressInput";

interface Props {
  onSubmit: (input: TradeInEstimateInput) => void;
  isPending: boolean;
  error: string | null;
}

interface FormState {
  address: string;
  area_m2: string;
  rooms: string;
  floor: string;
  total_floors: string;
  year_built: string;
  house_type: string;
  repair_state: string;
  has_balcony: boolean;
}

const INITIAL: FormState = {
  address: "",
  area_m2: "",
  rooms: "",
  floor: "",
  total_floors: "",
  year_built: "",
  house_type: "",
  repair_state: "",
  has_balcony: false,
};

function validate(f: FormState): string | null {
  if (f.address.trim().length < 3) return "Введите адрес (минимум 3 символа)";
  const a = Number(f.area_m2);
  if (!f.area_m2 || isNaN(a) || a <= 10 || a >= 500) return "Площадь: от 10 до 500 м²";
  const r = Number(f.rooms);
  if (f.rooms === "" || isNaN(r) || r < 0 || r > 10) return "Комнат: 0 (студия) — 10";
  const fl = Number(f.floor);
  if (!f.floor || isNaN(fl) || fl < 1 || fl > 100) return "Этаж: 1—100";
  const tf = Number(f.total_floors);
  if (!f.total_floors || isNaN(tf) || tf < 1 || tf > 100) return "Этажей в доме: 1—100";
  if (fl > tf) return "Этаж не может быть больше этажей в доме";
  if (f.year_built !== "") {
    const y = Number(f.year_built);
    if (isNaN(y) || y < 1800 || y > 2100) return "Год постройки: 1800—2100";
  }
  return null;
}

function toPayload(f: FormState): TradeInEstimateInput {
  const out: TradeInEstimateInput = {
    address: f.address.trim(),
    area_m2: Number(f.area_m2),
    rooms: Number(f.rooms),
    floor: Number(f.floor),
    total_floors: Number(f.total_floors),
    has_balcony: f.has_balcony,
  };
  if (f.year_built !== "") out.year_built = Number(f.year_built);
  if (f.house_type) out.house_type = f.house_type as HouseType;
  if (f.repair_state) out.repair_state = f.repair_state as RepairState;
  return out;
}

export function EstimateForm({ onSubmit, isPending, error }: Props) {
  const [form, setForm] = useState<FormState>(INITIAL);
  const [touched, setTouched] = useState(false);
  const valError = validate(form);
  const canSubmit = !valError && !isPending;

  function field(key: keyof FormState) {
    return (e: React.ChangeEvent<HTMLInputElement | HTMLSelectElement>) => {
      const value = e.target.type === "checkbox"
        ? (e.target as HTMLInputElement).checked
        : e.target.value;
      setForm((s) => ({ ...s, [key]: value }));
    };
  }

  function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setTouched(true);
    if (canSubmit) {
      onSubmit(toPayload(form));
    }
  }

  return (
    <form onSubmit={handleSubmit}>
      <div className="form-head">
        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" style={{ color: "var(--accent)" }}>
          <path d="M3 21v-7l9-7 9 7v7h-6v-6h-6v6z" />
        </svg>
        <h2>Параметры квартиры</h2>
        <span className="form-step">шаг 1/1</span>
      </div>

      <div className="form-body">
        {/* Address with autocomplete */}
        <div className="field autocomplete">
          <label className="field-label" htmlFor="addr">
            Адрес <span className="hint">Yandex / Nominatim</span>
            <span className="req">обязательно</span>
          </label>
          <div className="control-with-icon">
            <svg className="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
              <path d="M21 10c0 7-9 13-9 13S3 17 3 10a9 9 0 0 1 18 0z" />
              <circle cx="12" cy="10" r="3" />
            </svg>
            <AddressInput
              value={form.address}
              onChange={(val) => setForm((s) => ({ ...s, address: val }))}
              placeholder="ул. Малышева, 30 · Цвиллинга, 58 · Куйбышева, 48…"
            />
          </div>
        </div>

        {/* Area + Rooms */}
        <div className="field-row">
          <div className="field">
            <label className="field-label" htmlFor="area">
              Площадь <span className="req">*</span>
            </label>
            <div className="control-with-suffix">
              <input
                className="control mono"
                id="area"
                type="number"
                step="0.1"
                placeholder="54"
                min={11}
                max={499}
                value={form.area_m2}
                onChange={field("area_m2")}
                required
              />
              <span className="suffix">м²</span>
            </div>
          </div>
          <div className="field">
            <label className="field-label" htmlFor="rooms">
              Комнат <span className="req">*</span>
            </label>
            <select
              className="control"
              id="rooms"
              value={form.rooms}
              onChange={field("rooms")}
              required
            >
              <option value="">— выбрать —</option>
              <option value="0">Студия</option>
              <option value="1">1-к</option>
              <option value="2">2-к</option>
              <option value="3">3-к</option>
              <option value="4">4-к+</option>
            </select>
          </div>
        </div>

        {/* Floor + Total floors */}
        <div className="field-row">
          <div className="field">
            <label className="field-label" htmlFor="floor">
              Этаж <span className="req">*</span>
            </label>
            <input
              className="control mono"
              id="floor"
              type="number"
              placeholder="5"
              min={1}
              max={100}
              value={form.floor}
              onChange={field("floor")}
              required
            />
          </div>
          <div className="field">
            <label className="field-label" htmlFor="totalfloor">
              Всего этажей <span className="req">*</span>
            </label>
            <input
              className="control mono"
              id="totalfloor"
              type="number"
              placeholder="17"
              min={1}
              max={100}
              value={form.total_floors}
              onChange={field("total_floors")}
              required
            />
          </div>
        </div>

        {/* Year + House type */}
        <div className="field-row">
          <div className="field">
            <label className="field-label" htmlFor="year">
              Год постройки <span className="hint">опц.</span>
            </label>
            <input
              className="control mono"
              id="year"
              type="number"
              placeholder="1985"
              min={1800}
              max={2100}
              value={form.year_built}
              onChange={field("year_built")}
            />
          </div>
          <div className="field">
            <label className="field-label" htmlFor="type">
              Тип дома <span className="hint">опц.</span>
            </label>
            <select className="control" id="type" value={form.house_type} onChange={field("house_type")}>
              <option value="">— не указан —</option>
              <option value="panel">Панельный</option>
              <option value="brick">Кирпичный</option>
              <option value="monolith">Монолит</option>
              <option value="monolith_brick">Монолит-кирпич</option>
              <option value="other">Другое</option>
            </select>
          </div>
        </div>

        {/* Repair */}
        <div className="field">
          <label className="field-label" htmlFor="repair">
            Состояние ремонта <span className="hint">опц.</span>
          </label>
          <select
            className="control"
            id="repair"
            value={form.repair_state}
            onChange={field("repair_state")}
          >
            <option value="">— не указано —</option>
            <option value="needs_repair">Требует ремонта</option>
            <option value="standard">Стандартный</option>
            <option value="good">Хороший</option>
            <option value="excellent">Евроремонт</option>
          </select>
        </div>

        {/* Balcony */}
        <div className="field">
          <label
            className="field-label"
            style={{ display: "flex", alignItems: "center", gap: 8, cursor: "pointer" }}
          >
            <input
              type="checkbox"
              checked={form.has_balcony}
              onChange={field("has_balcony")}
              style={{ width: 14, height: 14, cursor: "pointer" }}
            />
            <span style={{ color: "var(--fg)" }}>Есть балкон / лоджия</span>
          </label>
        </div>

        {touched && valError && (
          <div
            style={{
              padding: "10px 12px",
              background: "var(--danger-soft)",
              border: "1px solid var(--danger)",
              borderRadius: 6,
              color: "var(--danger)",
              fontSize: 12,
            }}
          >
            {valError}
          </div>
        )}
        {error && (
          <div
            style={{
              padding: "10px 12px",
              background: "var(--danger-soft)",
              border: "1px solid var(--danger)",
              borderRadius: 6,
              color: "var(--danger)",
              fontSize: 12,
            }}
          >
            {error}
          </div>
        )}
      </div>

      <div className="form-foot">
        <button
          type="submit"
          disabled={!canSubmit}
          className="btn btn-primary"
          style={{ opacity: canSubmit ? 1 : 0.55 }}
        >
          {isPending ? (
            <>
              <svg
                width="14"
                height="14"
                viewBox="0 0 24 24"
                fill="none"
                stroke="currentColor"
                strokeWidth="2"
                strokeLinecap="round"
                style={{ animation: "ti-spin 1s linear infinite" }}
              >
                <path d="M21 12a9 9 0 1 1-6.219-8.56" />
              </svg>
              Считаем…
            </>
          ) : (
            <>
              <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.2" strokeLinecap="round" strokeLinejoin="round">
                <polyline points="20 6 9 17 4 12" />
              </svg>
              Оценить квартиру
            </>
          )}
        </button>
        <div className="form-foot-meta" style={{ marginTop: 8, fontSize: 11, color: "var(--muted)" }}>
          <span>Кэш по адресу — <span className="num">24 ч</span></span>
          <span className="ok" style={{ marginLeft: 12, color: "var(--success)" }}>● готов</span>
        </div>
      </div>

      <style>{`
        @keyframes ti-spin {
          from { transform: rotate(0deg); }
          to { transform: rotate(360deg); }
        }
      `}</style>
    </form>
  );
}