import { UintSchema } from "@ethernauta/core"
import type {
  Readable,
  ResolvedReader,
} from "@ethernauta/transport"
import { CallSchema } from "@ethernauta/transport"
import type { InferOutput } from "valibot"
import { object, parse, tuple, union } from "valibot"
import type { FilterResults } from "../../core/filter"
import { FilterResultsSchema } from "../../core/filter"

const ParametersSchema = union([
  tuple([UintSchema]),
  object({ filterIdentifier: UintSchema }),
])
type Parameters = InferOutput<typeof ParametersSchema>
/**
 * @returns Logs which occurred since last poll
 */
export function eth_getFilterChanges(
  _parameters: Parameters,
): Readable<FilterResults> {
  return async ([
    dispatcher,
    _context,
  ]: ResolvedReader): Promise<FilterResults> => {
    const method = "eth_getFilterChanges"
    const parameters = parse(ParametersSchema, _parameters)
    const call = parse(CallSchema, [method, parameters])
    const response = await dispatcher(call)
    if ("error" in response) {
      throw new Error(response.error.message)
    }
    const result = parse(
      FilterResultsSchema,
      response.result,
    )
    return result
  }
}