import {z} from 'zod'

export type Chain = 'mainnet' | 'hoodi';

export type Block = number;

export type BlockByNumber = {number: Block};

export type ChainView = 'latest' | 'finalized';

export type BlockByChainView = {view: ChainView};

export type BlockSelector = BlockByNumber | BlockByChainView;

export type CreateApiApiV2EthereumBlockMevTimingArgs = {body: {chain?: Chain | undefined, block: BlockSelector}};

export type CreateApiApiV2EthereumBlockMevTimingOptions = {baseUrl?: string | undefined, ApiKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const mevTimingStatus = z.enum(["on_time_mev", "timing_games", "aggressive_tg", "no_mev", "unknown", "pending"]);

export const wei = z.string();

export const slotOffsetMs = z.number().int();

export const mevWinningBid = z.object({value: wei, slot_offset_ms: slotOffsetMs, relays: z.array(z.string()), builder_pubkey: z.string().nullable()});

export const mevBid = z.object({value: wei, slot_offset_ms: slotOffsetMs, status: mevTimingStatus});

export const blockMevTimingData = z.object({status: mevTimingStatus, winning_bid: mevWinningBid.nullable(), first_better_bid: mevBid.nullable(), best_later_bid: mevBid.nullable(), missed_value: wei.nullable(), relay_count: z.number().int().gte(0).nullable(), bid_count: z.number().int().gte(0).nullable()});

export const blockMevTimingContainer = z.object({data: blockMevTimingData});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * MEV Timing
 * 
 * POST /api/v2/ethereum/block/mev-timing
 */
export const createApiApiV2EthereumBlockMevTiming = async (args: CreateApiApiV2EthereumBlockMevTimingArgs, options?: CreateApiApiV2EthereumBlockMevTimingOptions) => {
const {baseUrl = "https://beaconcha.in", fetch: fetchFn = fetch, ApiKeyAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (ApiKeyAuth !== undefined) headers.set('authorization', `Bearer ${ApiKeyAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v2/ethereum/block/mev-timing${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(blockMevTimingContainer, await res.json())
};