import {z} from 'zod'

export type GetApiV1ChainsOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiV1ChainsResponse = z.object({updated_at: z.string().optional(), items: z.array(z.object({name: z.string().optional(), chain_id: z.string().optional(), is_testnet: z.boolean().optional(), db_schema_name: z.string().optional(), label: z.string().optional(), category_label: z.string().optional(), logo_url: z.string().optional(), black_logo_url: z.string().optional(), white_logo_url: z.string().optional(), color_theme: z.object({red: z.number().int().optional(), green: z.number().int().optional(), blue: z.number().int().optional(), alpha: z.number().int().optional(), hex: z.string().optional(), css_rgb: z.string().optional()}).optional(), is_appchain: z.boolean().optional(), appchain_of: z.object({}).optional()})).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
};

/**
 * Returns all supported chains. Useful for building internal dashboards.
 * 
 * GET /v1/chains/
 */
export const getApiV1Chains = async (options?: GetApiV1ChainsOptions) => {
const {baseUrl = "https://api.covalenthq.com", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/v1/chains/${query.size > 0 ? `?${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(getApiV1ChainsResponse, await res.json())
};