import {z} from 'zod'

export type GetApiVirtualChainArgs = {blueScoreGte: number, limit?: (10 | 100) | undefined, resolveInputs?: boolean | undefined, includeCoinbase?: boolean | undefined};

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

export const vcTxInput = z.object({previous_outpoint_hash: z.string(), previous_outpoint_index: z.number().int(), signature_script: z.string().optional(), previous_outpoint_script: z.string().optional(), previous_outpoint_address: z.string().optional(), previous_outpoint_amount: z.number().int().optional()});

export const vcTxOutput = z.object({script_public_key: z.string(), script_public_key_address: z.string(), amount: z.number().int()});

export const vcTxModel = z.object({transaction_id: z.string(), is_accepted: z.boolean().optional(), inputs: z.array(vcTxInput).optional(), outputs: z.array(vcTxOutput).optional()});

export const vcBlockModel = z.object({hash: z.string(), blue_score: z.number().int(), daa_score: z.number().int().optional(), timestamp: z.number().int().optional(), transactions: z.array(vcTxModel).optional()});

export const getApiVirtualChainResponse = z.array(vcBlockModel);

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
};

/**
 * EXPERIMENTAL - EXPECT BREAKING CHANGES: Get virtual chain transactions by blue score
 * 
 * GET /virtual-chain
 */
export const getApiVirtualChain = async (args: GetApiVirtualChainArgs, options: GetApiVirtualChainOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.blueScoreGte != null) query.append("blueScoreGte", String(args.blueScoreGte))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.resolveInputs != null) query.append("resolveInputs", String(args.resolveInputs))
if (args.includeCoinbase != null) query.append("includeCoinbase", String(args.includeCoinbase))

const url = `${baseUrl.replace(/\/+$/, '')}/virtual-chain${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

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

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