import {z} from 'zod'

export type CreateApiV3McpHttpArgs = {'Mcp-Session-Id'?: (string | null) | undefined, 'MCP-Protocol-Version'?: (string | null) | undefined, 'X-Thread-Id'?: (string | null) | undefined, 'X-Definite-MCP-Client'?: (string | null) | undefined, accept?: (string | null) | undefined, body: {[key: string]: unknown}};

export type CreateApiV3McpHttpOptions = {baseUrl: string, McpAuthenticator?: string | undefined, fetch?: typeof fetch | undefined};

export const createApiV3McpHttpResponse = z.unknown();

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
};

/**
 * Mcp Http Post
 * 
 * POST /v3/mcp/http
 */
export const createApiV3McpHttp = async (args: CreateApiV3McpHttpArgs, options: CreateApiV3McpHttpOptions) => {
const {baseUrl, fetch: fetchFn = fetch, McpAuthenticator} = options ?? {}

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

if (args['Mcp-Session-Id'] != null) headers.set("Mcp-Session-Id", String(args['Mcp-Session-Id']))
if (args['MCP-Protocol-Version'] != null) headers.set("MCP-Protocol-Version", String(args['MCP-Protocol-Version']))
if (args['X-Thread-Id'] != null) headers.set("X-Thread-Id", String(args['X-Thread-Id']))
if (args['X-Definite-MCP-Client'] != null) headers.set("X-Definite-MCP-Client", String(args['X-Definite-MCP-Client']))
if (args.accept != null) headers.set("accept", String(args.accept))
if (McpAuthenticator !== undefined) headers.set("Authorization", McpAuthenticator)

const url = `${baseUrl.replace(/\/+$/, '')}/v3/mcp/http${query.size > 0 ? `?${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(createApiV3McpHttpResponse, await res.json())
};