'use client';

import dynamic from 'next/dynamic';
import type { UseFormRegister, UseFormSetValue, UseFormWatch, FieldErrors } from 'react-hook-form';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Select } from '@/components/ui/select';
import { Textarea } from '@/components/ui/textarea';
import {
  TRANSACTION_TYPES,
  PROPERTY_TYPES,
  DIRECTIONS,
  FURNISHING_OPTIONS,
  PROPERTY_CONDITION_OPTIONS,
  type CreateListingFormData,
} from '@/lib/validations/listings';

// Mapbox picker is client-only + imports `mapbox-gl` which pulls WebGL
// utilities — dynamic-import with ssr:false to keep it out of the server
// bundle.
const LocationPicker = dynamic(
  () => import('@/components/map/location-picker').then((m) => m.LocationPicker),
  {
    ssr: false,
    loading: () => (
      <div className="flex h-[320px] items-center justify-center rounded-lg border bg-muted text-sm text-muted-foreground">
        Đang tải bản đồ...
      </div>
    ),
  },
);

interface StepProps {
  register: UseFormRegister<CreateListingFormData>;
  errors: FieldErrors<CreateListingFormData>;
}

interface StepLocationProps extends StepProps {
  /** Optional — when provided, StepLocation renders the Mapbox picker and
   *  writes latitude/longitude (+ auto-fills address/ward/district/city on
   *  geocoder pick) into the form state. */
  setValue?: UseFormSetValue<CreateListingFormData>;
  watch?: UseFormWatch<CreateListingFormData>;
}

function FieldError({ message }: { message?: string }) {
  if (!message) return null;
  return <p className="mt-1 text-xs text-destructive">{message}</p>;
}

// ─── Step 1: Basic Info ──────────────────────────────────

export function StepBasicInfo({ register, errors }: StepProps) {
  return (
    <div className="space-y-4">
      <h3 className="text-lg font-semibold">Thông tin cơ bản</h3>

      <div className="grid gap-4 sm:grid-cols-2">
        <div>
          <Label htmlFor="transactionType">Loại giao dịch *</Label>
          <Select id="transactionType" {...register('transactionType')}>
            <option value="">-- Chọn --</option>
            {TRANSACTION_TYPES.map((t) => (
              <option key={t.value} value={t.value}>
                {t.label}
              </option>
            ))}
          </Select>
          <FieldError message={errors.transactionType?.message} />
        </div>

        <div>
          <Label htmlFor="propertyType">Loại bất động sản *</Label>
          <Select id="propertyType" {...register('propertyType')}>
            <option value="">-- Chọn --</option>
            {PROPERTY_TYPES.map((t) => (
              <option key={t.value} value={t.value}>
                {t.label}
              </option>
            ))}
          </Select>
          <FieldError message={errors.propertyType?.message} />
        </div>
      </div>

      <div>
        <Label htmlFor="title">Tiêu đề tin đăng *</Label>
        <Input id="title" placeholder="VD: Bán căn hộ 2PN tại Vinhomes Central Park" {...register('title')} />
        <FieldError message={errors.title?.message} />
      </div>

      <div>
        <Label htmlFor="description">Mô tả chi tiết *</Label>
        <Textarea
          id="description"
          rows={5}
          placeholder="Mô tả chi tiết về bất động sản..."
          {...register('description')}
        />
        <FieldError message={errors.description?.message} />
      </div>
    </div>
  );
}

// ─── Step 2: Location ────────────────────────────────────

export function StepLocation({ register, errors, setValue, watch }: StepLocationProps) {
  // Watch lat/lng so the picker stays in sync when the user edits the text
  // inputs manually.
  const latStr = watch?.('latitude') ?? '';
  const lngStr = watch?.('longitude') ?? '';
  const latNum = latStr ? Number(latStr) : null;
  const lngNum = lngStr ? Number(lngStr) : null;
  const latValid = latNum != null && Number.isFinite(latNum) && latNum >= -90 && latNum <= 90;
  const lngValid = lngNum != null && Number.isFinite(lngNum) && lngNum >= -180 && lngNum <= 180;

  return (
    <div className="space-y-4">
      <h3 className="text-lg font-semibold">Vị trí</h3>

      {setValue && (
        <LocationPicker
          lat={latValid ? latNum : null}
          lng={lngValid ? lngNum : null}
          onChange={(coords, resolved) => {
            setValue('latitude', coords.lat.toFixed(6), { shouldValidate: true, shouldDirty: true });
            setValue('longitude', coords.lng.toFixed(6), { shouldValidate: true, shouldDirty: true });
            if (resolved) {
              if (resolved.address) setValue('address', resolved.address, { shouldDirty: true });
              if (resolved.ward) setValue('ward', resolved.ward, { shouldDirty: true });
              if (resolved.district) setValue('district', resolved.district, { shouldDirty: true });
              if (resolved.city) setValue('city', resolved.city, { shouldDirty: true });
            }
          }}
          height="360px"
        />
      )}

      <div>
        <Label htmlFor="address">Địa chỉ *</Label>
        <Input id="address" placeholder="Số nhà, tên đường" {...register('address')} />
        <FieldError message={errors.address?.message} />
      </div>

      <div className="grid gap-4 sm:grid-cols-3">
        <div>
          <Label htmlFor="ward">Phường/Xã *</Label>
          <Input id="ward" placeholder="Phường/Xã" {...register('ward')} />
          <FieldError message={errors.ward?.message} />
        </div>
        <div>
          <Label htmlFor="district">Quận/Huyện *</Label>
          <Input id="district" placeholder="Quận/Huyện" {...register('district')} />
          <FieldError message={errors.district?.message} />
        </div>
        <div>
          <Label htmlFor="city">Tỉnh/Thành phố *</Label>
          <Input id="city" placeholder="Tỉnh/Thành phố" {...register('city')} />
          <FieldError message={errors.city?.message} />
        </div>
      </div>

      <div className="grid gap-4 sm:grid-cols-2">
        <div>
          <Label htmlFor="latitude">Vĩ độ</Label>
          <Input
            id="latitude"
            type="number"
            step="any"
            placeholder="VD: 10.7769"
            {...register('latitude')}
          />
          <FieldError message={errors.latitude?.message} />
        </div>
        <div>
          <Label htmlFor="longitude">Kinh độ</Label>
          <Input
            id="longitude"
            type="number"
            step="any"
            placeholder="VD: 106.7009"
            {...register('longitude')}
          />
          <FieldError message={errors.longitude?.message} />
        </div>
      </div>
    </div>
  );
}

// ─── Step 3: Details ─────────────────────────────────────

export function StepDetails({ register, errors }: StepProps) {
  return (
    <div className="space-y-4">
      <h3 className="text-lg font-semibold">Thông số chi tiết</h3>

      <div className="grid gap-4 sm:grid-cols-2 md:grid-cols-3">
        <div>
          <Label htmlFor="areaM2">Diện tích (m²) *</Label>
          <Input id="areaM2" type="number" step="0.1" placeholder="VD: 75" {...register('areaM2')} />
          <FieldError message={errors.areaM2?.message} />
        </div>
        <div>
          <Label htmlFor="usableAreaM2">Diện tích sử dụng (m²)</Label>
          <Input id="usableAreaM2" type="number" step="0.1" {...register('usableAreaM2')} />
        </div>
        <div>
          <Label htmlFor="bedrooms">Phòng ngủ</Label>
          <Input id="bedrooms" type="number" min="0" {...register('bedrooms')} />
        </div>
        <div>
          <Label htmlFor="bathrooms">Phòng tắm</Label>
          <Input id="bathrooms" type="number" min="0" {...register('bathrooms')} />
        </div>
        <div>
          <Label htmlFor="floors">Số tầng</Label>
          <Input id="floors" type="number" min="0" {...register('floors')} />
        </div>
        <div>
          <Label htmlFor="floor">Tầng số</Label>
          <Input id="floor" type="number" min="0" {...register('floor')} />
        </div>
        <div>
          <Label htmlFor="totalFloors">Tổng số tầng tòa nhà</Label>
          <Input id="totalFloors" type="number" min="0" {...register('totalFloors')} />
        </div>
        <div>
          <Label htmlFor="direction">Hướng nhà</Label>
          <Select id="direction" {...register('direction')}>
            <option value="">-- Không chọn --</option>
            {DIRECTIONS.map((d) => (
              <option key={d.value} value={d.value}>
                {d.label}
              </option>
            ))}
          </Select>
        </div>
        <div>
          <Label htmlFor="yearBuilt">Năm xây dựng</Label>
          <Input id="yearBuilt" type="number" placeholder="VD: 2020" {...register('yearBuilt')} />
        </div>
      </div>

      <div>
        <Label htmlFor="legalStatus">Pháp lý</Label>
        <Input id="legalStatus" placeholder="VD: Sổ hồng, sổ đỏ..." {...register('legalStatus')} />
      </div>

      <div>
        <Label htmlFor="projectName">Tên dự án</Label>
        <Input id="projectName" placeholder="VD: Vinhomes Central Park" {...register('projectName')} />
      </div>

      <div>
        <Label htmlFor="amenities">Tiện ích (cách nhau bởi dấu phẩy)</Label>
        <Input id="amenities" placeholder="VD: Hồ bơi, Gym, Công viên" {...register('amenities')} />
      </div>

      <fieldset className="space-y-4 rounded-lg border p-4">
        <legend className="px-2 text-sm font-semibold">Nội thất & điều kiện</legend>

        <div className="grid gap-4 sm:grid-cols-2 md:grid-cols-3">
          <div>
            <Label htmlFor="furnishing">Nội thất</Label>
            <Select id="furnishing" {...register('furnishing')}>
              <option value="">-- Không chọn --</option>
              {FURNISHING_OPTIONS.map((o) => (
                <option key={o.value} value={o.value}>
                  {o.label}
                </option>
              ))}
            </Select>
          </div>
          <div>
            <Label htmlFor="propertyCondition">Tình trạng</Label>
            <Select id="propertyCondition" {...register('propertyCondition')}>
              <option value="">-- Không chọn --</option>
              {PROPERTY_CONDITION_OPTIONS.map((o) => (
                <option key={o.value} value={o.value}>
                  {o.label}
                </option>
              ))}
            </Select>
          </div>
          <div>
            <Label htmlFor="balconyDirection">Hướng ban công</Label>
            <Select id="balconyDirection" {...register('balconyDirection')}>
              <option value="">-- Không chọn --</option>
              {DIRECTIONS.map((d) => (
                <option key={d.value} value={d.value}>
                  {d.label}
                </option>
              ))}
            </Select>
          </div>
          <div>
            <Label htmlFor="maintenanceFeeVND">Phí quản lý / tháng (VNĐ)</Label>
            <Input
              id="maintenanceFeeVND"
              type="text"
              inputMode="numeric"
              placeholder="VD: 2500000"
              {...register('maintenanceFeeVND')}
            />
          </div>
          <div>
            <Label htmlFor="parkingSlots">Chỗ để xe</Label>
            <Input id="parkingSlots" type="number" min="0" {...register('parkingSlots')} />
          </div>
          <div>
            <Label htmlFor="petFriendly">Cho phép thú cưng</Label>
            <Select id="petFriendly" {...register('petFriendly')}>
              <option value="">-- Không chọn --</option>
              <option value="true">Có</option>
              <option value="false">Không</option>
            </Select>
          </div>
        </div>

        <div>
          <Label htmlFor="viewType">View (cách nhau bởi dấu phẩy)</Label>
          <Input
            id="viewType"
            placeholder="VD: Sông, Thành phố, Công viên"
            {...register('viewType')}
          />
        </div>

        <div>
          <Label htmlFor="suitableFor">Phù hợp với (cách nhau bởi dấu phẩy)</Label>
          <Input
            id="suitableFor"
            placeholder="VD: Gia đình có con nhỏ, Người đi làm xa"
            {...register('suitableFor')}
          />
        </div>

        <div>
          <Label htmlFor="whyThisLocation">Vì sao khu vực này phù hợp</Label>
          <Textarea
            id="whyThisLocation"
            rows={3}
            placeholder="Mô tả ngắn lý do khu vực này phù hợp với người mua..."
            {...register('whyThisLocation')}
          />
        </div>
      </fieldset>
    </div>
  );
}

// ─── Step 4: Pricing ─────────────────────────────────────

export function StepPricing({ register, errors }: StepProps) {
  return (
    <div className="space-y-4">
      <h3 className="text-lg font-semibold">Giá & Hoa hồng</h3>

      <div>
        <Label htmlFor="priceVND">Giá bán (VNĐ) *</Label>
        <Input id="priceVND" placeholder="VD: 5000000000" {...register('priceVND')} />
        <FieldError message={errors.priceVND?.message} />
        <p className="mt-1 text-xs text-muted-foreground">Nhập số không có dấu chấm hoặc dấu phẩy</p>
      </div>

      <div className="grid gap-4 sm:grid-cols-2">
        <div>
          <Label htmlFor="rentPriceMonthly">Giá thuê/tháng (VNĐ)</Label>
          <Input id="rentPriceMonthly" placeholder="Chỉ áp dụng cho thuê" {...register('rentPriceMonthly')} />
        </div>
        <div>
          <Label htmlFor="commissionPct">Hoa hồng (%)</Label>
          <Input
            id="commissionPct"
            type="number"
            step="0.1"
            min="0"
            max="100"
            placeholder="VD: 2.5"
            {...register('commissionPct')}
          />
        </div>
      </div>
    </div>
  );
}
