import {z} from 'zod'

export type GetApiApiSignalArgs = {company: string};

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

export const startup = z.object({name: z.string().optional(), description: z.string().optional(), stage: z.enum(["Pre-seed", "Seed", "Series A/B", "Growth"]).optional(), geography: z.string().optional(), commitVelocity14d: z.number().int().optional(), commitVelocityChange: z.string().optional(), contributors: z.number().int().optional(), contributorGrowth: z.string().optional(), newRepos: z.number().int().optional(), signalType: z.enum(["Engineering hiring burst", "Infrastructure buildout", "Deploy frequency spike", "Framework migration"]).optional(), githubUrl: z.string().optional(), websiteUrl: z.string().optional(), linkedinUrl: z.string().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
};

/**
 * Single startup signal by company name
 * 
 * GET /api/signal
 */
export const getApiApiSignal = async (args: GetApiApiSignalArgs, options?: GetApiApiSignalOptions) => {
const {baseUrl = "https://signals.gitdealflow.com", fetch: fetchFn = fetch} = options ?? {}

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

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

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