import type { ArrayStyle, ObjectStyle, SerializerOptions } from "./pathSerializer.js"

export type QuerySerializer = (query: Record<string, unknown>) => string

export type BodySerializer = (body: any) => any

export interface QuerySerializerOptions {
  allowReserved?: boolean
  array?: SerializerOptions<ArrayStyle>
  object?: SerializerOptions<ObjectStyle>
}

const serializeFormDataPair = (data: FormData, key: string, value: unknown): void => {
  if (typeof value === "string" || value instanceof Blob) {
    data.append(key, value)
  } else {
    data.append(key, JSON.stringify(value))
  }
}

const serializeUrlSearchParamsPair = (data: URLSearchParams, key: string, value: unknown): void => {
  if (typeof value === "string") {
    data.append(key, value)
  } else {
    data.append(key, JSON.stringify(value))
  }
}

export const formDataBodySerializer = {
  bodySerializer: <T extends Record<string, any> | Array<Record<string, any>>>(body: T): FormData => {
    const data = new FormData()

    Object.entries(body).forEach(([key, value]) => {
      if (value === undefined || value === null) {
        return
      }
      if (Array.isArray(value)) {
        value.forEach((v) => serializeFormDataPair(data, key, v))
      } else {
        serializeFormDataPair(data, key, value)
      }
    })

    return data
  },
}

export const jsonBodySerializer = {
  bodySerializer: <T>(body: T): string =>
    JSON.stringify(body, (_key, value) => (typeof value === "bigint" ? value.toString() : value)),
}

export const urlSearchParamsBodySerializer = {
  bodySerializer: <T extends Record<string, any> | Array<Record<string, any>>>(body: T): string => {
    const data = new URLSearchParams()

    Object.entries(body).forEach(([key, value]) => {
      if (value === undefined || value === null) {
        return
      }
      if (Array.isArray(value)) {
        value.forEach((v) => serializeUrlSearchParamsPair(data, key, v))
      } else {
        serializeUrlSearchParamsPair(data, key, value)
      }
    })

    return data.toString()
  },
}
