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

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

export type AmendmentEffectiveFrom = 'AS_OF_AMENDMENT_DATE' | 'END_OF_CURRENT_BILLING_CYCLE';

export type AmendFullContractItemRequest = {product_id: string, price: Price, quantity: number, revenue_pattern?: RevenuePattern | undefined, discount?: Discount | undefined, tax_rate?: TaxRate | undefined, start_date: string, end_date?: string | undefined, effective_from?: AmendmentEffectiveFrom | undefined, amending?: string | 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 PreviewContractAmendmentRequest = {amendment_date: string, items: Array<AmendFullContractItemRequest>, invoicing: Invoicing};

export type CreateApiContractsContractIdAmendmentsPreviewArgs = {contract_id: string, body: PreviewContractAmendmentRequest};

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

export const productType = z.enum(["PRODUCT", "BUNDLE"]);

export const currencyCode = z.string();

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

export const fixedRecurringPrice = z.object({amount: monetaryAmount, interval_months: z.number().int().gte(1).lte(12), type: z.string()});

export const oneTimePrice = z.object({amount: monetaryAmount, type: z.string()});

export const perUnitBilling = z.object({type: z.string(), amount: monetaryAmount, units: z.number().int().gte(1)});

export const tier = z.object({up_to: z.number().int().gte(1), flat_price: monetaryAmount.optional(), per_unit_price: monetaryAmount.optional()});

export const tieredBilling = z.object({type: z.string(), mode: z.enum(["GRADUATED", "METERED"]), tiers: z.array(tier)});

export const billingScheme = z.discriminatedUnion("type", [perUnitBilling, tieredBilling]);

export const usagePrice = z.object({interval_months: z.number().int().gte(1).lte(12), type: z.string(), billing_scheme: billingScheme});

export const price = z.discriminatedUnion("type", [fixedRecurringPrice, oneTimePrice, usagePrice]);

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

export const revenuePattern = z.enum(["DAILY", "EVEN_PERIOD", "PROGRESS"]);

export const progressMeasure = z.literal("MILESTONES");

export const milestoneValueMode = z.enum(["PERCENTAGE", "AMOUNT"]);

export const contractMilestoneStatus = z.enum(["OPEN", "DUE_THIS_PERIOD", "OVERDUE", "COMPLETED", "CANCELLED"]);

export const externalReference = z.object({type: z.string(), id: z.string(), url: z.string().optional()});

export const contractMilestoneCancellation = z.object({effective_date: z.string(), credit_memo_id: z.string().nullable().optional()});

export const contractMilestone = z.object({id: z.string(), key: z.string(), name: z.string(), sequence: z.number().int(), percentage: z.string().nullable().optional(), allocated_amount: roundedMonetaryAmount.nullable().optional(), amount: roundedMonetaryAmount.nullable().optional(), expected_date: z.string().nullable().optional(), status: contractMilestoneStatus, completed_date: z.string().nullable().optional(), memo: z.string().nullable().optional(), external_references: z.array(externalReference), cancellation: contractMilestoneCancellation.nullable().optional()});

export const progressPlan = z.object({measure: progressMeasure, value_mode: milestoneValueMode, as_of_date: z.string(), milestones: z.array(contractMilestone)});

export const amountDiscount = z.object({amount_off: roundedMonetaryAmount, type: z.string().optional()});

export const percentageDiscount = z.object({percentage_off: z.number().gte(0).lte(100), type: z.string().optional()});

export const discount = z.discriminatedUnion("type", [amountDiscount, percentageDiscount]);

export const countryCode = z.string();

export const taxRate = z.object({percentage: z.string(), tax_amount: roundedMonetaryAmount.optional(), country: countryCode, type: z.enum(["VAT", "SALES_TAX"]), description: z.string()});

export const fieldAssignments = z.array(z.object({field_id: z.string(), field_value_id: z.string()}));

export const accountCode = z.string();

export const usageCommitment = z.object({amount: roundedMonetaryAmount, revenue_account: accountCode});

export const bundleInvoiceDisplay = z.enum(["BUNDLE_AND_COMPONENTS", "BUNDLE_LINE_ONLY"]);

export const contractItemBundleComponent = z.object({id: z.string(), product_id: z.string(), product_name: z.string(), quantity: z.string(), revenue_pattern: revenuePattern, allocated_amount: roundedMonetaryAmount});

export const contractItemBundle = z.object({invoice_display: bundleInvoiceDisplay, components: z.array(contractItemBundleComponent)});

export const contractItem = z.object({id: z.string(), product_id: z.string(), product_type: productType, price: price, quantity: z.string(), total_value: roundedMonetaryAmount, revenue_pattern: revenuePattern.optional(), progress_plan: progressPlan.nullable().optional(), discount: discount.optional(), tax_rate: taxRate.optional(), start_date: z.string(), end_date: z.string().optional(), status: z.enum(["AMENDED", "ACTIVE"]), amending: z.string().optional(), fields: fieldAssignments.optional(), external_references: z.array(externalReference), usage_minimum_commitment: usageCommitment.optional(), description: z.string().optional(), bundle: contractItemBundle.optional(), declared_ssp: monetaryAmount.nullable().optional()});

export const contractStatus = z.enum(["ACTIVE", "IN_EFFECT", "CANCELLED", "ENDED", "AMENDED"]);

export const monthlyInvoicing = z.object({payment_terms: z.number().int().gte(0), interval: z.string(), day: z.number().int().gte(1).lte(31)});

export const monthlyProratedInvoicing = z.object({payment_terms: z.number().int().gte(0), interval: z.string(), day: z.number().int().gte(1).lte(31)});

export const quarterlyInvoicing = z.object({payment_terms: z.number().int().gte(0), interval: z.string(), month_day: z.string()});

export const semiAnnualInvoicing = z.object({payment_terms: z.number().int().gte(0), interval: z.string(), month_day: z.string()});

export const yearlyInvoicing = z.object({payment_terms: z.number().int().gte(0), interval: z.string(), month_day: z.string()});

export const invoicing = z.discriminatedUnion("interval", [monthlyInvoicing, monthlyProratedInvoicing, quarterlyInvoicing, semiAnnualInvoicing, yearlyInvoicing]);

export const usageInvoicingFrequency = z.enum(["MONTHLY", "QUARTERLY", "SEMI_ANNUAL", "YEARLY"]);

export const paymentTerms = z.number().int().gte(0);

export const usageInvoiceDate = z.enum(["FIRST_DAY_OF_NEXT_CYCLE", "LAST_DAY_OF_CURRENT_CYCLE"]);

export const usageInvoiceCycle = z.enum(["CALENDAR", "SUBSCRIPTION_ANNIVERSARY"]);

export const usageInvoicing = z.object({frequency: usageInvoicingFrequency, payment_terms: paymentTerms, invoice_date: usageInvoiceDate, cycle: usageInvoiceCycle});

export const minimumCommitmentInvoicingFrequency = z.enum(["MONTHLY", "MONTHLY_PRORATED", "QUARTERLY", "SEMI_ANNUAL", "YEARLY"]);

export const minimumCommitmentInvoicing = z.object({frequency: minimumCommitmentInvoicingFrequency, payment_terms: paymentTerms});

export const usageConfiguration = z.object({usage_invoicing: usageInvoicing, minimum_commitment_invoicing: minimumCommitmentInvoicing.optional(), minimum_commitment_cycle: z.enum(["MONTHLY", "CONTRACT"]).optional(), contract_level_minimum_commitment: usageCommitment.optional()});

export const exchangeRate = z.object({base: currencyCode, target: currencyCode, rate: z.string(), date: z.string()});

export const customerAddress = z.object({id: z.string().optional(), line1: z.string(), line2: z.string().nullable().optional(), city: z.string(), state: z.string().nullable().optional(), zip_code: z.string(), country: countryCode});

export const emailSelectionMode = z.enum(["ALL_CUSTOMER_EMAILS", "SELECTED_EMAILS"]);

export const emailRecipientType = z.enum(["MAIN_SENDER", "CC", "BCC"]);

export const emailRecipient = z.object({customer_email_id: z.string(), recipient_type: emailRecipientType});

export const emailRecipients = z.array(emailRecipient);

export const emailSelection = z.object({mode: emailSelectionMode, recipients: emailRecipients.nullable().optional()});

export const invoiceStatus = z.enum(["UNPAID", "PAID", "PARTIALLY_PAID", "UNBILLED", "CREDITED", "PARTIALLY_CREDITED"]);

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

export const itemRevenue = z.object({period: calendarPeriod.optional(), pattern: revenuePattern.optional(), account_code: accountCode.optional()});

export const invoiceItem = z.object({id: z.string(), description: z.string(), revenue: itemRevenue, total_amount: roundedMonetaryAmount, total_discount: roundedMonetaryAmount, taxed_amount: roundedMonetaryAmount, gross_rate: roundedMonetaryAmount, quantity: z.string(), product_id: z.string(), external_references: z.array(externalReference), fields: fieldAssignments.optional()});

export const contractInvoice = z.object({id: z.string(), invoice_number: z.string(), invoice_date: z.string(), due_date: z.string(), status: invoiceStatus, total: roundedMonetaryAmount, taxed_amount: roundedMonetaryAmount, items: z.array(invoiceItem), external_references: z.array(externalReference)});

export const contractApproval = z.object({approval_request_id: z.string(), operation: z.enum(["CREATE", "UPDATE"]), status: z.enum(["WAITING", "APPROVED", "REJECTED", "CANCELLED", "WITHDRAWN"]), reason: z.string().nullable().optional()});

export const expandedContract = z.object({id: z.string(), customer_id: z.string(), subsidiary_id: z.string(), name: z.string(), items: z.array(contractItem), status: contractStatus, start_date: z.string(), end_date: z.string().optional(), close_date: z.string(), invoicing: invoicing, usage_configuration: usageConfiguration.optional(), total_value: roundedMonetaryAmount, external_references: z.array(externalReference).optional(), exchange_rate: exchangeRate.optional(), metadata: z.record(z.string(), z.string()).optional(), purchase_order_number: z.string().optional(), shipping_customer_id: z.string().nullable().optional(), billing_address: customerAddress.nullable().optional(), shipping_address: customerAddress.nullable().optional(), email_selection: emailSelection, invoices: z.array(contractInvoice).optional(), approval: contractApproval.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
};

/**
 * Previews contract amendment
 * 
 * POST /contracts/{contract_id}/amendments/preview
 */
export const createApiContractsContractIdAmendmentsPreview = async (args: CreateApiContractsContractIdAmendmentsPreviewArgs, options?: CreateApiContractsContractIdAmendmentsPreviewOptions) => {
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/${encodeURIComponent(String(args.contract_id))}/amendments/preview${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(expandedContract, await res.json())
};