import {z} from 'zod'

export type ConvertQuoteRequestDto = {chainId: number, fromToken: string, toToken: string, amount: string, fromAddress?: string | undefined};

export type CreateApiConvertQuoteArgs = {body: ConvertQuoteRequestDto};

export type CreateApiConvertQuoteOptions = {baseUrl: string, bearer?: string | undefined, fetch?: typeof fetch | undefined};

export const convertCallDto = z.object({to: z.string(), data: z.string(), value: z.string().optional()});

export const convertAmountsDto = z.object({srcRaw: z.string(), srcDecimals: z.number(), srcSymbol: z.string(), dstRaw: z.string(), dstMinRaw: z.string(), dstDecimals: z.number(), dstSymbol: z.string()});

export const convertFeesDto = z.object({totalUsd: z.string(), percent: z.string(), items: z.array(z.string())});

export const convertQuoteResponseDto = z.object({strategy: z.string(), chainId: z.number(), calls: z.array(convertCallDto), amounts: convertAmountsDto, fees: convertFeesDto, expiresAt: z.string()});

export const convertPlanPolicyDto = z.object({slippageBps: z.number(), routeSlippageBps: z.number(), integratorFeeBps: z.number(), gasLimit: z.string()});

export const convertPlanResponseDto = z.object({strategy: z.enum(["swapAndMint", "swapAndStake"]), provider: z.literal("lifi"), fromChainId: z.number(), hubUsdcAmount: z.string(), deadline: z.number(), policy: convertPlanPolicyDto, expiresAt: z.string()});

export const createApiConvertQuoteResponse = z.union([convertQuoteResponseDto, convertPlanResponseDto]);

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
};

/**
 * Quote a conversion and return the transactions that execute it
 * 
 * POST /convert/quote
 */
export const createApiConvertQuote = async (args: CreateApiConvertQuoteArgs, options: CreateApiConvertQuoteOptions) => {
const {baseUrl, fetch: fetchFn = fetch, bearer} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/convert/quote${query.size > 0 ? `?${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(createApiConvertQuoteResponse, await res.json())
};