import {z} from 'zod'

export type GetApiInspectContractCodeArgs = {chain_id: string, address: string, file_name?: string | undefined};

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

export const pagination = z.object({next_call: z.object({tool_name: z.string(), params: z.object({cursor: z.string()}).and(z.record(z.string(), z.unknown()))})});

export const toolResponse = z.object({data: z.union([z.object({}), z.array(z.unknown()), z.string(), z.number(), z.boolean()]).nullable(), data_description: z.array(z.string()).nullable().optional(), notes: z.array(z.string()).nullable().optional(), instructions: z.array(z.string()).nullable().optional(), pagination: pagination.nullable().optional()});

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
};

/**
 * Inspect contract code
 * 
 * GET /inspect_contract_code
 */
export const getApiInspectContractCode = async (args: GetApiInspectContractCodeArgs, options?: GetApiInspectContractCodeOptions) => {
const {baseUrl = "https://mcp.blockscout.com/v1", fetch: fetchFn = fetch} = options ?? {}

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

if (args.chain_id != null) query.append("chain_id", String(args.chain_id))
if (args.address != null) query.append("address", String(args.address))
if (args.file_name != null) query.append("file_name", String(args.file_name))

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