add BookingBill model

db/billingRates.ts

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+export enum BILLING_RATES {
+  INTERN = 0.24,
+  EXTERN_UP_TO_200 = 0.45,
+  EXTERN_OVER_200 = 0.55,
+}

db/bookingBill.ts

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+import * as mongoose from 'mongoose'
+import { BILLING_RATES } from './billingRates'
+import { PAYMENT_STATE } from './paymentState'
+import { BookingDocument } from './booking'
+
+export interface AdditionalCosts {
+  name: string
+  value: number
+}
+
+export interface BookingBillDocument
+  extends mongoose.SchemaTimestampsConfig,
+    mongoose.Document {
+  booking: BookingDocument
+  milageStart: number
+  milageEnd: number
+  milage?: number
+  rate: BILLING_RATES
+  paymentState: PAYMENT_STATE
+  additionalCosts: AdditionalCosts[]
+}
+
+export interface BookingBillModel extends mongoose.Model<BookingBillDocument> {}
+
+const BookingBillSchema = new mongoose.Schema<BookingBillDocument>(
+  {
+    booking: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: 'Booking',
+      required: true,
+    },
+    milageStart: { type: Number, required: true },
+    milageEnd: { type: Number, required: true },
+    rate: {
+      type: Number,
+      enum: Object.values(BILLING_RATES),
+      default: BILLING_RATES.EXTERN_UP_TO_200,
+      required: true,
+    },
+    paymentState: {
+      type: String,
+      enum: Object.values(PAYMENT_STATE),
+      default: PAYMENT_STATE.OUTSTANDING,
+      required: true,
+    },
+    additionalCosts: [
+      {
+        name: { type: String, required: true },
+        value: { type: Number, required: true },
+      },
+    ],
+  },
+  { timestamps: true, collation: { locale: 'de', strength: 1 } }
+)
+
+BookingBillSchema.virtual('milage').get(function () {
+  if (!this.milageStart || !this.milageEnd) {
+    return null
+  }
+  return this.milageEnd - this.milageStart
+})
+
+BookingBillSchema.virtual('invoiceAmount').get(function () {
+  if (!this.milageStart || !this.milageEnd) {
+    return null
+  }
+  const milageCosts = this.milage * this.rate
+  const additionalCostSum = this.additionalConsts.reduce(
+    (memo: number, { value }) => memo + value,
+    0
+  )
+  return milageCosts + additionalCostSum
+})
+
+export default <BookingBillModel>mongoose.models.BookingBill ||
+  mongoose.model<BookingBillDocument, BookingBillModel>(
+    'BookingBill',
+    BookingBillSchema
+  )

db/paymentState.ts

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+export enum PAYMENT_STATE {
+  OUTSTANDING = 'outstanding',
+  INVOICED = 'invoiced',
+  PAID = 'paid',
+}