import { ApiPropertyOptional } from '@nestjs/swagger';
import { Transform, Type } from 'class-transformer';
import {
  IsBoolean,
  IsOptional,
  IsString,
  IsNumber,
  IsEnum,
  IsInt,
  Min,
  Max,
} from 'class-validator';

export enum SortByOption {
  PRICE_ASC = 'price_asc',
  PRICE_DESC = 'price_desc',
  DATE_DESC = 'date_desc',
  RELEVANCE = 'relevance',
}

export class SearchPropertiesDto {
  @ApiPropertyOptional({ description: 'Free-text search query', example: 'chung cu quan 7' })
  @IsOptional()
  @IsString()
  q?: string;

  @ApiPropertyOptional({ description: 'Property type filter', example: 'apartment' })
  @IsOptional()
  @IsString()
  propertyType?: string;

  @ApiPropertyOptional({ description: 'Transaction type filter (sale or rent)', example: 'sale' })
  @IsOptional()
  @IsString()
  transactionType?: string;

  @ApiPropertyOptional({ description: 'Minimum price in VND', example: 1000000000, minimum: 0 })
  @IsOptional()
  @Type(() => Number)
  @IsNumber()
  @Min(0)
  priceMin?: number;

  @ApiPropertyOptional({ description: 'Maximum price in VND', example: 5000000000, minimum: 0 })
  @IsOptional()
  @Type(() => Number)
  @IsNumber()
  @Min(0)
  priceMax?: number;

  @ApiPropertyOptional({ description: 'Minimum area in m²', example: 50, minimum: 0 })
  @IsOptional()
  @Type(() => Number)
  @IsNumber()
  @Min(0)
  areaMin?: number;

  @ApiPropertyOptional({ description: 'Maximum area in m²', example: 200, minimum: 0 })
  @IsOptional()
  @Type(() => Number)
  @IsNumber()
  @Min(0)
  areaMax?: number;

  @ApiPropertyOptional({ description: 'Number of bedrooms', example: 2, minimum: 0 })
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(0)
  bedrooms?: number;

  @ApiPropertyOptional({ description: 'District name', example: 'Quan 7' })
  @IsOptional()
  @IsString()
  district?: string;

  @ApiPropertyOptional({ description: 'Ward name', example: 'Tan Phong' })
  @IsOptional()
  @IsString()
  ward?: string;

  @ApiPropertyOptional({ description: 'City name', example: 'Ho Chi Minh' })
  @IsOptional()
  @IsString()
  city?: string;

  @ApiPropertyOptional({
    description: 'Chỉ trả về tin đang được đẩy nổi bật (featured)',
    example: true,
  })
  @IsOptional()
  @Transform(({ value }) => {
    if (value === undefined || value === null || value === '') return undefined;
    if (typeof value === 'boolean') return value;
    const normalized = String(value).toLowerCase();
    if (normalized === 'true' || normalized === '1') return true;
    if (normalized === 'false' || normalized === '0') return false;
    return value;
  })
  @IsBoolean()
  featured?: boolean;

  @ApiPropertyOptional({ description: 'Sort order', enum: SortByOption, example: SortByOption.PRICE_ASC })
  @IsOptional()
  @IsEnum(SortByOption)
  sortBy?: SortByOption;

  @ApiPropertyOptional({ description: 'Page number (1-based)', example: 1, default: 1, minimum: 1 })
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  @Transform(({ value }) => value ?? 1)
  page?: number;

  @ApiPropertyOptional({ description: 'Results per page', example: 20, default: 20, minimum: 1, maximum: 100 })
  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  @Max(100)
  @Transform(({ value }) => value ?? 20)
  perPage?: number;
}