import {z} from 'zod'

export type GetApiAnalyticsArgs = {period?: ('7d' | '30d' | '90d' | 'all') | undefined, platform?: string | undefined, limit?: number | undefined};

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

export const analyticsResult = z.object({period: z.string().optional(), summary: z.object({totals: z.record(z.string(), z.number()).optional(), byPlatform: z.record(z.string(), z.record(z.string(), z.number())).optional()}).optional(), posts: z.array(z.object({postId: z.string().optional(), caption: z.string().nullable().optional(), publishedAt: z.string().nullable().optional(), platform: z.string().optional(), views: z.number().nullable().optional(), likes: z.number().nullable().optional(), comments: z.number().nullable().optional(), shares: z.number().nullable().optional(), reach: z.number().nullable().optional(), saves: z.number().nullable().optional(), impressions: z.number().nullable().optional(), reposts: z.number().nullable().optional(), totalInteractions: z.number().nullable().optional(), fetchedAt: z.string().nullable().optional(), error: z.string().nullable().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
};

/**
 * Read post analytics (refreshed hourly)
 * 
 * GET /analytics
 */
export const getApiAnalytics = async (args: GetApiAnalyticsArgs, options?: GetApiAnalyticsOptions) => {
const {baseUrl = "https://api.posteahora.com/functions/v1/api", fetch: fetchFn = fetch, ApiKey} = options ?? {}

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

if (args.period != null) query.append("period", String(args.period))
if (args.platform != null) query.append("platform", String(args.platform))
if (args.limit != null) query.append("limit", String(args.limit))
if (ApiKey !== undefined) headers.set('authorization', `Bearer ${ApiKey}`)

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