import {z} from 'zod'

export type GetApiApiV1PublicUsageOpenrouterOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const publicShowcaseUsage = z.object({range: z.object({start: z.string(), end: z.string()}), totals: z.object({totalTokens: z.number(), inputTokens: z.number(), outputTokens: z.number(), requestCount: z.number(), carbonKg: z.number(), electricityKwh: z.number(), waterLiters: z.number(), waterLowerBoundL: z.number(), waterUpperBoundL: z.number()}), avgDailyTokens: z.number(), daily: z.array(z.object({date: z.string(), totalTokens: z.number(), inputTokens: z.number(), outputTokens: z.number(), carbonKg: z.number(), electricityKwh: z.number(), waterLiters: z.number()})), byProvider: z.array(z.object({provider: z.string(), totalTokens: z.number(), pct: z.number()})), methodology: z.object({factorsVersion: z.string(), framework: z.string()}), computedAt: z.string()});

export const publicOpenRouterUsage = z.object({asOf: z.string(), coverageEnd: z.string(), months: z.array(z.object({month: z.string(), tokens: z.number(), partial: z.boolean().optional()})), byMonth: z.array(z.object({month: z.string(), total: z.number(), providers: z.array(z.object({slug: z.string(), name: z.string(), tokens: z.number(), pct: z.number()})), models: z.array(z.object({slug: z.string(), name: z.string(), provider: z.string(), providerSlug: z.string(), version: z.string().optional(), free: z.boolean(), tokens: z.number(), pct: z.number()}))})), sourceUrl: z.string(), computedAt: z.string(), windows: z.object({"30d": publicShowcaseUsage.optional(), "365d": publicShowcaseUsage.optional()}).optional()});

export const getApiApiV1PublicUsageOpenrouterResponse = z.object({success: z.literal(true), data: publicOpenRouterUsage});

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
};

/**
 * OpenRouter public usage series
 * 
 * GET /api/v1/public/usage/openrouter
 */
export const getApiApiV1PublicUsageOpenrouter = async (options?: GetApiApiV1PublicUsageOpenrouterOptions) => {
const {baseUrl = "https://api.crbonfree.com", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/public/usage/openrouter${query.size > 0 ? `?${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(getApiApiV1PublicUsageOpenrouterResponse, await res.json())
};