import {z} from 'zod'

export type GetApiCabinetLandingSlugArgs = {slug: string, lang?: string | undefined};

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

export const landingFeature = z.object({icon: z.string().optional(), title: z.string().optional(), description: z.string().optional()});

export const landingTariffPeriod = z.object({days: z.number().int(), label: z.string(), price_kopeks: z.number().int(), price_label: z.string(), original_price_kopeks: z.number().int().nullable().optional(), original_price_label: z.string().nullable().optional(), discount_percent: z.number().int().nullable().optional()});

export const landingTariff = z.object({id: z.number().int(), name: z.string(), description: z.string().nullable().optional(), traffic_limit_gb: z.number().int(), device_limit: z.number().int(), tier_level: z.number().int(), periods: z.array(landingTariffPeriod)});

export const landingPaymentMethodSubOption = z.object({id: z.string(), name: z.string()});

export const landingPaymentMethod = z.object({method_id: z.string(), display_name: z.string(), description: z.string().nullable().optional(), icon_url: z.string().nullable().optional(), sort_order: z.number().int().optional(), min_amount_kopeks: z.number().int().nullable().optional(), max_amount_kopeks: z.number().int().nullable().optional(), currency: z.string().nullable().optional(), sub_options: z.array(landingPaymentMethodSubOption).nullable().optional()});

export const landingDiscountInfo = z.object({percent: z.number().int(), ends_at: z.string(), badge_text: z.string().nullable().optional()});

export const landingConfigResponse = z.object({slug: z.string(), title: z.string(), subtitle: z.string().nullable().optional(), features: z.array(landingFeature), footer_text: z.string().nullable().optional(), tariffs: z.array(landingTariff), payment_methods: z.array(landingPaymentMethod), gift_enabled: z.boolean(), custom_css: z.string().nullable().optional(), meta_title: z.string().nullable().optional(), meta_description: z.string().nullable().optional(), discount: landingDiscountInfo.nullable().optional(), background_config: z.record(z.string(), z.unknown()).nullable().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 Landing Config
 * 
 * GET /cabinet/landing/{slug}
 */
export const getApiCabinetLandingSlug = async (args: GetApiCabinetLandingSlugArgs, options: GetApiCabinetLandingSlugOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/cabinet/landing/${encodeURIComponent(String(args.slug))}${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(landingConfigResponse, await res.json())
};