import {z} from 'zod'

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

export const usageTierFormatted = z.object({cost: z.string().optional(), label: z.string().optional(), per_unit: z.string().optional(), usage_price_per_unit: z.string().optional()});

export const overageFeeCalculation = z.object({calculation_tiers: z.array(usageTierFormatted).optional(), formatted_included_usage: z.string().optional(), formatted_total_amount: z.string().optional(), total_amount: z.number().int().optional(), total_days: z.number().int().optional(), total_free_used: z.number().optional(), total_included: z.number().optional(), total_over_free: z.number().optional(), total_used: z.number().optional()});

export const usageFormatted = z.object({included_text: z.string().optional(), overage_fee_calculation: overageFeeCalculation.optional(), short_unit: z.string().optional(), tiers: z.array(usageTierFormatted).optional()});

export const usageBasedItemTier = z.object({created: z.string().optional(), id: z.number().int().optional(), maximum: z.number().optional(), minimum_fee: z.number().int().optional(), owner_id: z.number().int().optional(), price: z.number().optional(), tax_amount: z.number().int().optional(), total: z.number().int().optional(), updated: z.string().optional(), usage_based_item_id: z.number().int().optional()});

export const usageBasedItem = z.object({archived: z.boolean().optional(), created: z.string().optional(), fee_type: z.string().optional(), formatted: usageFormatted.optional(), id: z.number().int().optional(), included: z.number().optional(), included_period: z.string().optional(), name: z.string().optional(), owner_id: z.number().int().optional(), single_tier: z.boolean().optional(), tax_amount: z.number().int().optional(), tax_rate_id: z.number().int().optional(), tax_rate_ids: z.array(z.number().int()).optional(), tiers: z.array(usageBasedItemTier).optional(), total_included: z.number().optional(), unit: z.string().optional(), unlimited: z.boolean().optional(), updated: z.string().optional()});

export const getApiUsageBasedItemsResponse = z.array(usageBasedItem);

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
};

/**
 * Returns an array of usage based items owned by the user.
 * 
 * GET /usage-based-items
 * 
 * Also accepts auth: API-Key
 */
export const getApiUsageBasedItems = async (options: GetApiUsageBasedItemsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (Bearer !== undefined) headers.set("Authorization", Bearer)

const url = `${baseUrl.replace(/\/+$/, '')}/usage-based-items${query.size > 0 ? `?${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(getApiUsageBasedItemsResponse, await res.json())
};