import {z} from 'zod'

export type GetApiCommitArgs = {height?: number | undefined};

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

export const blockID = z.object({hash: z.string(), parts: z.object({total: z.number().int(), hash: z.string()})});

export const blockHeader = z.object({version: z.object({block: z.string(), app: z.string()}), chain_id: z.string(), height: z.string(), time: z.string(), last_block_id: blockID, last_commit_hash: z.string(), data_hash: z.string(), validators_hash: z.string(), next_validators_hash: z.string(), consensus_hash: z.string(), app_hash: z.string(), last_results_hash: z.string(), evidence_hash: z.string(), proposer_address: z.string()});

export const commitResponse = z.object({jsonrpc: z.string(), id: z.number().int(), result: z.object({signed_header: z.object({header: blockHeader, commit: z.object({height: z.string(), round: z.number().int(), block_id: blockID, signatures: z.array(z.object({block_id_flag: z.number().int().optional(), validator_address: z.string().optional(), timestamp: z.string().optional(), signature: z.string().optional()}))})}), canonical: z.boolean()})});

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
};

/**
 * Get commit results at a specified height
 * 
 * GET /commit
 */
export const getApiCommit = async (args: GetApiCommitArgs, options?: GetApiCommitOptions) => {
const {baseUrl = "http://localhost:26657", fetch: fetchFn = fetch} = options ?? {}

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

if (args.height != null) query.append("height", String(args.height))

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