import {z} from 'zod'

export type CurrencyCode = string;

export type MonetaryAmount = {amount: string, currency: CurrencyCode};

export type FixedRecurringPrice = {amount: MonetaryAmount, interval_months: number, type: string};

export type OneTimePrice = {amount: MonetaryAmount, type: string};

export type PerUnitBilling = {type: string, amount: MonetaryAmount, units: number};

export type Tier = {up_to: number, flat_price?: MonetaryAmount | undefined, per_unit_price?: MonetaryAmount | undefined};

export type TieredBilling = {type: string, mode: 'GRADUATED' | 'METERED', tiers: Array<Tier>};

export type BillingScheme = PerUnitBilling | TieredBilling;

export type UsagePrice = {interval_months: number, type: string, billing_scheme: BillingScheme};

export type Price = FixedRecurringPrice | OneTimePrice | UsagePrice;

export type RevenuePattern = 'DAILY' | 'EVEN_PERIOD' | 'PROGRESS';

export type ProgressMeasure = 'MILESTONES';

export type MilestoneValueMode = 'PERCENTAGE' | 'AMOUNT';

export type RoundedMonetaryAmount = {amount: string, currency: CurrencyCode};

export type ContractMilestoneRequest = {key: string, name: string, sequence: number, percentage?: string | undefined, amount?: RoundedMonetaryAmount | undefined, expected_date?: (string | null) | undefined};

export type ProgressPlanRequest = {measure: ProgressMeasure, value_mode: MilestoneValueMode, milestones: Array<ContractMilestoneRequest>};

export type AmountDiscount = {amount_off: RoundedMonetaryAmount, type?: string | undefined};

export type PercentageDiscount = {percentage_off: number, type?: string | undefined};

export type Discount = AmountDiscount | PercentageDiscount;

export type CountryCode = string;

export type TaxRateWithOptionalAmount = {percentage: unknown, tax_amount?: RoundedMonetaryAmount | undefined, country: CountryCode, type: 'VAT' | 'SALES_TAX', description: string};

export type ExternalReference = {type: string, id: string, url?: string | undefined};

export type FieldAssignments = Array<{field_id: string, field_value_id: string}>;

export type AccountCode = string;

export type UsageCommitment = {amount: RoundedMonetaryAmount, revenue_account: AccountCode};

export type ContractItemRequest = {id?: string | undefined, product_id: string, price: Price, quantity: number, revenue_pattern?: RevenuePattern | undefined, progress_plan?: ProgressPlanRequest | undefined, discount?: Discount | undefined, tax_rate?: TaxRateWithOptionalAmount | undefined, start_date?: string | undefined, end_date?: string | undefined, external_reference?: ExternalReference | undefined, fields?: FieldAssignments | undefined, usage_minimum_commitment?: UsageCommitment | undefined, description?: string | undefined, declared_ssp?: (MonetaryAmount | null) | undefined};

export type MonthlyInvoicing = {payment_terms: number, interval: string, day: number};

export type MonthlyProratedInvoicing = {payment_terms: number, interval: string, day: number};

export type QuarterlyInvoicing = {payment_terms: number, interval: string, month_day: string};

export type SemiAnnualInvoicing = {payment_terms: number, interval: string, month_day: string};

export type YearlyInvoicing = {payment_terms: number, interval: string, month_day: string};

export type Invoicing = MonthlyInvoicing | MonthlyProratedInvoicing | QuarterlyInvoicing | SemiAnnualInvoicing | YearlyInvoicing;

export type UsageInvoicingFrequency = 'MONTHLY' | 'QUARTERLY' | 'SEMI_ANNUAL' | 'YEARLY';

export type PaymentTerms = number;

export type UsageInvoiceDate = 'FIRST_DAY_OF_NEXT_CYCLE' | 'LAST_DAY_OF_CURRENT_CYCLE';

export type UsageInvoiceCycle = 'CALENDAR' | 'SUBSCRIPTION_ANNIVERSARY';

export type UsageInvoicing = {frequency: UsageInvoicingFrequency, payment_terms: PaymentTerms, invoice_date: UsageInvoiceDate, cycle: UsageInvoiceCycle};

export type MinimumCommitmentInvoicingFrequency = 'MONTHLY' | 'MONTHLY_PRORATED' | 'QUARTERLY' | 'SEMI_ANNUAL' | 'YEARLY';

export type MinimumCommitmentInvoicing = {frequency: MinimumCommitmentInvoicingFrequency, payment_terms: PaymentTerms};

export type UsageConfiguration = {usage_invoicing: UsageInvoicing, minimum_commitment_invoicing?: MinimumCommitmentInvoicing | undefined, minimum_commitment_cycle?: ('MONTHLY' | 'CONTRACT') | undefined, contract_level_minimum_commitment?: UsageCommitment | undefined};

export type NullableId = string | null;

export type EmailSelectionMode = 'ALL_CUSTOMER_EMAILS' | 'SELECTED_EMAILS';

export type EmailRecipientType = 'MAIN_SENDER' | 'CC' | 'BCC';

export type EmailRecipient = {customer_email_id: string, recipient_type: EmailRecipientType};

export type EmailRecipients = Array<EmailRecipient>;

export type EmailSelection = {mode: EmailSelectionMode, recipients?: (EmailRecipients | null) | undefined};

export type ExchangeRate = {base: CurrencyCode, target: CurrencyCode, rate: string, date: string};

export type BillingPeriod = {start: string, end: string};

export type ContractInvoiceScheduleItem = {contract_item_id?: string | undefined, description: string, quantity: string, price_type: 'FIXED' | 'USAGE' | 'USAGE_COMMITMENT', unit_amount: RoundedMonetaryAmount, total_amount: RoundedMonetaryAmount, billing_period: BillingPeriod};

export type ContractInvoiceScheduleEntry = {issue_date: string, currency: string, total: RoundedMonetaryAmount, items: Array<ContractInvoiceScheduleItem>};

export type ContractInvoiceSchedule = {invoices: Array<ContractInvoiceScheduleEntry>};

export type ContractScope = 'FULL' | 'REVENUE_RECOGNITION_ONLY';

export type RevenueRecognitionOnlyContractItemRequest = {product_id: string, price: MonetaryAmount, discount?: Discount | undefined, revenue_pattern: RevenuePattern, start_date?: string | undefined, end_date?: string | undefined, external_reference: ExternalReference, declared_ssp?: (MonetaryAmount | null) | undefined};

export type InvoiceScheduleInvoiceItem = {description: string, contract_item_reference: string, quantity: unknown, total_amount: RoundedMonetaryAmount, tax_amount?: RoundedMonetaryAmount | undefined, discount_amount?: RoundedMonetaryAmount | undefined, external_references: Array<ExternalReference>};

export type InvoiceScheduleInvoice = {due_date?: string | undefined, invoice_date: string, invoice_number: string, tax_amount?: RoundedMonetaryAmount | undefined, items: Array<InvoiceScheduleInvoiceItem>, external_references: Array<ExternalReference>};

export type InvoiceSchedule = {invoices?: Array<InvoiceScheduleInvoice> | undefined};

export type CreateContractRequest = {name: string, close_date: string, start_date: string, end_date?: string | undefined, items: Array<ContractItemRequest>, invoicing?: Invoicing | undefined, usage_configuration?: UsageConfiguration | undefined, external_references?: Array<ExternalReference> | undefined, customer_id: string, subsidiary_id?: string | undefined, shipping_customer_id?: string | undefined, billing_address_id?: NullableId | undefined, shipping_address_id?: NullableId | undefined, email_selection?: EmailSelection | undefined, exchange_rate?: ExchangeRate | undefined, purchase_order_number?: string | undefined, invoice_schedule?: ContractInvoiceSchedule | undefined, scope: ContractScope} | {name: string, close_date?: string | undefined, start_date: string, end_date?: string | undefined, items: Array<RevenueRecognitionOnlyContractItemRequest>, invoice_schedule: InvoiceSchedule, external_references: Array<ExternalReference>, customer_id: string, subsidiary_id?: string | undefined, scope: ContractScope};

export type CreateApiContractsPreviewInvoiceScheduleArgs = {body: CreateContractRequest};

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

export const currencyCode = z.string();

export const roundedMonetaryAmount = z.object({amount: z.string(), currency: currencyCode});

export const billingPeriod = z.object({start: z.string(), end: z.string()});

export const contractInvoiceScheduleItem = z.object({contract_item_id: z.string().optional(), description: z.string(), quantity: z.string(), price_type: z.enum(["FIXED", "USAGE", "USAGE_COMMITMENT"]), unit_amount: roundedMonetaryAmount, total_amount: roundedMonetaryAmount, billing_period: billingPeriod});

export const contractInvoiceScheduleEntry = z.object({issue_date: z.string(), currency: z.string(), total: roundedMonetaryAmount, items: z.array(contractInvoiceScheduleItem)});

export const contractInvoiceSchedule = z.object({invoices: z.array(contractInvoiceScheduleEntry)});

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
};

/**
 * Preview the invoice schedule for a contract
 * 
 * POST /contracts/preview-invoice-schedule
 */
export const createApiContractsPreviewInvoiceSchedule = async (args: CreateApiContractsPreviewInvoiceScheduleArgs, options?: CreateApiContractsPreviewInvoiceScheduleOptions) => {
const {baseUrl = "https://api.rillet.com", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/contracts/preview-invoice-schedule${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(contractInvoiceSchedule, await res.json())
};