import {z} from 'zod'

export type GetApiAnalyticsInsightsArgs = {period?: number | undefined, force?: boolean | undefined, cached_only?: boolean | undefined, environment?: (0 | 1) | undefined};

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

export const v4AnalyticsInsight = z.object({type: z.enum(["critical", "positive", "tip", "info"]), metric: z.string(), title: z.string(), body: z.string(), action: z.string()});

export const v4AnalyticsInsights = z.object({object: z.literal("analytics_insights"), url: z.string(), generated_at: z.string().nullable(), period_days: z.number().int().gte(1).lte(365), health: z.enum(["healthy", "watch", "critical", "null"]).nullable(), health_score: z.number().int().gte(0).lte(10).optional(), summary: z.string(), insights: z.array(v4AnalyticsInsight), is_cached: z.boolean().optional(), is_stale: z.boolean().optional(), is_empty: z.boolean().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
};

/**
 * Get analytics insights
 * 
 * GET /analytics/insights
 */
export const getApiAnalyticsInsights = async (args: GetApiAnalyticsInsightsArgs, options?: GetApiAnalyticsInsightsOptions) => {
const {baseUrl = "https://api.qonversion.io/v4", fetch: fetchFn = fetch, secretAuth} = 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.force != null) query.append("force", String(args.force))
if (args.cached_only != null) query.append("cached_only", String(args.cached_only))
if (args.environment != null) query.append("environment", String(args.environment))
if (secretAuth !== undefined) headers.set('authorization', `Bearer ${secretAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/analytics/insights${query.size > 0 ? `?${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(v4AnalyticsInsights, await res.json())
};