fedisearch/application/src/lib/transform.ts

import { ZodSchema } from 'zod'

export function preserveUndefined<Source, Target> (cast: (value: Source) => Target) {
  return (value: Source | undefined): Target | undefined => {
    if (value === undefined) {
      return undefined
    }
    return cast(value)
  }
}

export function preserveNull<Source, Target> (cast: (value: Source) => Target) {
  return (value: Source | null): Target | null => {
    if (value === null) {
      return null
    }
    return cast(value)
  }
}

export function undefinedToDefault<Type> (defaultValue: Type): (value: Type | undefined) => Type {
  return (value) => typeof value === 'undefined' ? defaultValue : value
}

export function stringTrimmed (value: string | undefined): string {
  return (value ?? '').trim().replace(/^\++|\++$/g, '')
}

export function stringToInt (value: string): number {
  return parseInt(value)
}

export function stringToBool (value: string): boolean {
  switch (value) {
    case 'true':
    case '1':
    case 'on':
    case 'yes':
      return true
    default:
      return false
  }
}

// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
export function transform<Target> (originalSchema: ZodSchema<any>, cast: (value: unknown) => Target, newSchema: ZodSchema<any>) {
  return originalSchema.refine(
    value => {
      try {
        value = cast(value)
        newSchema.parse(value)
      } catch (err) {
        return false
      }
      return true
    }
  ).transform(cast)
}