import {z} from 'zod'

export type IsoDatetime = string;

export type BillingGranularity = 'hourly' | 'daily' | 'weekly' | 'monthly' | 'yearly';

export type DimensionId = string;

export type BillingCostType = 'billed_cost' | 'discounted_cost' | 'amortized_cost' | 'discounted_amortized_cost' | 'real_cost' | 'on_demand_cost' | 'invoiced_amortized_cost' | 'usage_amount';

export type GetApiV2BillingCostsArgs = {start_date: IsoDatetime, end_date?: IsoDatetime | undefined, granularity?: BillingGranularity | undefined, group_by?: Array<DimensionId> | undefined, filters?: string | undefined, cost_type?: BillingCostType | undefined, align_to_granularity?: boolean | undefined, include_projected_row_count?: boolean | undefined, cursor?: string | undefined};

export type GetApiV2BillingCostsOptions = {baseUrl?: string | undefined, APIKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const isoDatetime = z.string();

export const billingCost = z.object({usage_date: isoDatetime.optional(), cost: z.number().optional(), projected_row_count: z.number().int().optional()});

export const billingCosts = z.array(billingCost);

export const nullableString = z.union([z.string(), z.unknown()]);

export const pagination = z.object({page_count: z.number().int().optional(), item_count: z.number().int().optional(), total_count: z.number().int().optional(), cursor: z.object({next_cursor: nullableString.optional(), previous_cursor: nullableString.optional(), has_next: z.boolean().optional(), has_previous: z.boolean().optional()}).optional()});

export const getApiV2BillingCostsResponse = z.object({costs: billingCosts.optional(), pagination: pagination.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
};

/**
 * This API will return cost data according to the parameters passed in.
 * 
 * GET /v2/billing/costs
 */
export const getApiV2BillingCosts = async (args: GetApiV2BillingCostsArgs, options?: GetApiV2BillingCostsOptions) => {
const {baseUrl = "https://api.cloudzero.com", fetch: fetchFn = fetch, APIKeyAuth} = options ?? {}

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

if (args.start_date != null) query.append("start_date", String(args.start_date))
if (args.end_date != null) query.append("end_date", String(args.end_date))
if (args.granularity != null) query.append("granularity", String(args.granularity))
for (const item of args.group_by ?? []) query.append("group_by", String(item))
if (args.filters != null) query.append("filters", String(args.filters))
if (args.cost_type != null) query.append("cost_type", String(args.cost_type))
if (args.align_to_granularity != null) query.append("align_to_granularity", String(args.align_to_granularity))
if (args.include_projected_row_count != null) query.append("include_projected_row_count", String(args.include_projected_row_count))
if (args.cursor != null) query.append("cursor", String(args.cursor))
if (APIKeyAuth !== undefined) headers.set("Authorization", APIKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/billing/costs${query.size > 0 ? `?${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(getApiV2BillingCostsResponse, await res.json())
};