import {z} from 'zod'

export type GetApiPlansCodeChargesArgs = {page?: number | undefined, per_page?: number | undefined};

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

export const chargeModelEnum = z.enum(["dynamic", "graduated", "graduated_percentage", "package", "percentage", "standard", "volume"]);

export const chargeObjectProperties = z.object({grouped_by: z.array(z.string()).optional(), pricing_group_keys: z.array(z.string()).optional(), graduated_ranges: z.array(z.object({from_value: z.number().int(), to_value: z.number().int().nullable(), flat_amount: z.string(), per_unit_amount: z.string()})).optional(), graduated_percentage_ranges: z.array(z.object({from_value: z.number().int(), to_value: z.number().int().nullable(), rate: z.string(), flat_amount: z.string()})).optional(), amount: z.string().optional(), free_units: z.number().int().optional(), package_size: z.number().int().optional(), rate: z.string().optional(), fixed_amount: z.string().optional(), free_units_per_events: z.number().int().nullable().optional(), free_units_per_total_aggregation: z.string().nullable().optional(), per_transaction_max_amount: z.string().nullable().optional(), per_transaction_min_amount: z.string().nullable().optional(), volume_ranges: z.array(z.object({from_value: z.number().int(), to_value: z.number().int().nullable(), flat_amount: z.string(), per_unit_amount: z.string()})).optional(), presentation_group_keys: z.array(z.object({value: z.string().optional(), options: z.object({display_in_invoice: z.boolean().optional()}).optional()})).optional()});

export const chargeProperties = z.object({grouped_by: z.array(z.string()).optional(), pricing_group_keys: z.array(z.string()).optional(), graduated_ranges: z.array(z.object({from_value: z.number().int(), to_value: z.number().int().nullable(), flat_amount: z.string(), per_unit_amount: z.string()})).optional(), graduated_percentage_ranges: z.array(z.object({from_value: z.number().int(), to_value: z.number().int().nullable(), rate: z.string(), flat_amount: z.string()})).optional(), amount: z.string().optional(), free_units: z.number().int().optional(), package_size: z.number().int().optional(), rate: z.string().optional(), fixed_amount: z.string().optional(), free_units_per_events: z.number().int().nullable().optional(), free_units_per_total_aggregation: z.string().nullable().optional(), per_transaction_max_amount: z.string().nullable().optional(), per_transaction_min_amount: z.string().nullable().optional(), volume_ranges: z.array(z.object({from_value: z.number().int(), to_value: z.number().int().nullable(), flat_amount: z.string(), per_unit_amount: z.string()})).optional()});

export const chargeFilterObject = z.object({lago_id: z.string().optional(), charge_code: z.string().optional(), invoice_display_name: z.string().nullable(), properties: chargeProperties, values: z.record(z.string(), z.array(z.string()))});

export const taxObject = z.object({lago_id: z.string(), name: z.string(), code: z.string(), description: z.string().nullable(), rate: z.number(), applied_to_organization: z.boolean(), applied_to_billing_entities_codes: z.array(z.string()).optional(), created_at: z.string()});

export const chargeObject = z.object({lago_id: z.string(), lago_billable_metric_id: z.string(), code: z.string().optional(), billable_metric_code: z.string(), invoice_display_name: z.string().nullable().optional(), created_at: z.string(), charge_model: chargeModelEnum, pay_in_advance: z.boolean(), invoiceable: z.boolean(), regroup_paid_fees: z.enum(["null", "invoice"]).nullable(), prorated: z.boolean(), min_amount_cents: z.number().int(), properties: chargeObjectProperties, filters: z.array(chargeFilterObject), taxes: z.array(taxObject).optional(), applied_pricing_unit: z.object({code: z.string(), conversion_rate: z.string()}).nullable().optional(), accepts_target_wallet: z.boolean().optional(), lago_parent_id: z.string().nullable().optional()});

export const paginationMeta = z.object({current_page: z.number().int(), next_page: z.number().int().nullable().optional(), prev_page: z.number().int().nullable().optional(), total_pages: z.number().int(), total_count: z.number().int()});

export const chargesPaginated = z.object({charges: z.array(chargeObject), meta: paginationMeta});

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
};

/**
 * List all charges for a plan
 * 
 * GET /plans/{code}/charges
 */
export const getApiPlansCodeCharges = async (args: GetApiPlansCodeChargesArgs, options?: GetApiPlansCodeChargesOptions) => {
const {baseUrl = "https://api.getlago.com/api/v1", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args.page != null) query.append("page", String(args.page))
if (args.per_page != null) query.append("per_page", String(args.per_page))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/plans/${encodeURIComponent(String(args.code))}/charges${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(chargesPaginated, await res.json())
};