import { Type } from 'class-transformer';
import {
  IsArray,
  IsIn,
  IsInt,
  IsOptional,
  IsString,
  Max,
  Min,
  ValidateNested,
} from 'class-validator';

/**
 * One row of the XTable filter bar.
 *
 * Mirrors the object legacy's XFilterRow pushed into `query.filters`:
 * `{ id, field, op, value, value2? }`. `id` is a client-side react key
 * (a random float) and is accepted but ignored.
 */
export class TableFilterDto {
  @IsOptional()
  id?: number | string;

  @IsOptional()
  @IsString()
  field?: string;

  /**
   * Legacy operators, kept verbatim. `between` uses value + value2 and is what
   * the date-range filter emits.
   */
  @IsOptional()
  @IsIn(['=', '!=', '>', '>=', '<', '<=', 'like', 'in', 'between', 'null', 'notnull'])
  op?: string;

  @IsOptional()
  value?: unknown;

  @IsOptional()
  value2?: unknown;
}

/**
 * The request body XTable POSTs, ported from its requestData():
 *
 *   { ...query, select, titles, report_title, op? }
 *
 * where query = { search, filters, total, limit, page }.
 */
export class TableQueryDto {
  @IsOptional()
  @IsString()
  search?: string;

  @IsOptional()
  @IsArray()
  @ValidateNested({ each: true })
  @Type(() => TableFilterDto)
  filters?: TableFilterDto[];

  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  page?: number;

  @IsOptional()
  @Type(() => Number)
  @IsInt()
  @Min(1)
  @Max(500)
  limit?: number;

  /** Sort spec: '+field' ascending, '-field' descending (legacy `order`). */
  @IsOptional()
  @IsString()
  order?: string;

  /** Columns currently visible; drives the export payload. */
  @IsOptional()
  @IsArray()
  select?: string[];

  /** key -> Farsi column heading, used for export headers. */
  @IsOptional()
  titles?: Record<string, string>;

  @IsOptional()
  @IsString()
  report_title?: string;

  /**
   * Export mode. Legacy expected `{ url }` back and did `window.open(data.url)`.
   * Exports are not implemented yet; the controller rejects these explicitly
   * rather than returning a broken url.
   */
  @IsOptional()
  @IsIn(['excel', 'json', 'print'])
  op?: 'excel' | 'json' | 'print';

  /** Echoed back inside `query`; the client owns this value. */
  @IsOptional()
  total?: number;
}