
/*--------------------------------------------------------------------------

@sinclair/typebox/prototypes

The MIT License (MIT)

Copyright (c) 2017-2025 Haydn Paterson (sinclair) <haydn.developer@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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The above copyright notice and this permission notice shall be included in
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

---------------------------------------------------------------------------*/

import { Static, Kind, TSchema, TObject, SchemaOptions, CreateType, TLiteral, TypeRegistry, ValueGuard, KindGuard, TUnion } from '@sinclair/typebox'
import { GetErrorFunction, SetErrorFunction } from 'src/errors/function'
import { Value } from '@sinclair/typebox/value'

// ------------------------------------------------------------------
// DiscriminatedUnionError
// ------------------------------------------------------------------
const errorFunction = GetErrorFunction()

// prettier-ignore
SetErrorFunction((parameter) => {
  if (parameter.schema[Kind] !== 'DiscriminatedUnion') {
    return errorFunction(parameter)
  }
  const union = parameter.schema as TDiscriminatedUnion
  // Try generate error when value matches known discriminator literal
  if (ValueGuard.IsObject(parameter.value) && union.discriminator in parameter.value) {
    const variant = parameter.schema.anyOf.find((variant: TSchema) => union.discriminator in variant.properties
      && (variant.properties[union.discriminator] as TLiteral).const ===
      (parameter.value as Record<PropertyKey, unknown>)[union.discriminator])
    if (KindGuard.IsSchema(variant)) {
      const literal = variant.properties[union.discriminator]
      return `Invalid value for DiscriminatedUnion variant '${literal.const}'`
    }
  }
  // Return generic error containing possible discriminator types.
  const options = union.anyOf.map(object => object.properties[union.discriminator].const) as string[]
  return `Expected value of ${options.map(option => `'${option}'`).join(', ')} for DiscriminatedUnion`
})

// ------------------------------------------------------------------
// TDiscriminatedUnionObject
//
// Constructs a base TObject type requiring 1 discriminator property
// ------------------------------------------------------------------
// prettier-ignore
type TDiscriminatedUnionProperties<Discriminator extends string> = {
  [_ in Discriminator]: TLiteral
}
// prettier-ignore
type TDiscriminatedUnionObject<Discriminator extends string> = TObject<TDiscriminatedUnionProperties<Discriminator>>

// ------------------------------------------------------------------
// DiscriminatedUnion
// ------------------------------------------------------------------
// prettier-ignore
TypeRegistry.Set('DiscriminatedUnion', (schema: TDiscriminatedUnion, value) => {
  return schema.anyOf.some(variant => Value.Check(variant, [], value))
})
// prettier-ignore
export interface TDiscriminatedUnion<Discriminator extends string = string, Types extends TObject[] = TObject[]> extends TSchema {
  [Kind]: 'DiscriminatedUnion'
  static: Static<TUnion<Types>>
  discriminator: Discriminator
  anyOf: Types
}

/** Creates a DiscriminatedUnion. */
// prettier-ignore
export function DiscriminatedUnion<Discriminator extends string, Types extends TDiscriminatedUnionObject<Discriminator>[]>(
  discriminator: Discriminator, types: [...Types], options?: SchemaOptions
): TDiscriminatedUnion<Discriminator, Types> {
  return CreateType({ [Kind]: 'DiscriminatedUnion', anyOf: types, discriminator }, options) as never
}



