import * as mongoose from 'mongoose'
import { BILL_STATUS, MILAGE_TARIFS } from './enums'
import { getBillTotal } from '../helpers/bill'

export interface AdditionalCost {
  name: string
  value: number
}

export interface BillDocument
  extends mongoose.SchemaTimestampsConfig,
    mongoose.Document {
  milageStart: number
  milageEnd: number
  milage?: number
  tarif: MILAGE_TARIFS
  status: BILL_STATUS
  additionalCosts: AdditionalCost[]
}

export interface BillModel extends mongoose.Model<BillDocument> {}

const BillSchema = new mongoose.Schema<BillDocument>(
  {
    milageStart: {
      type: Number,
      required: true,
      validate: {
        validator: function (v: number) {
          const bill = this as BillDocument

          return v <= bill.milageEnd
        },
        message: (props) => `${props.value} is bigger than milageEnd!`,
      },
    },
    milageEnd: {
      type: Number,
      required: true,

      validate: {
        validator: function (v: number) {
          const bill = this as BillDocument

          return v >= bill.milageStart
        },
        message: (props) => `${props.value} is smaller than milageStart!`,
      },
    },
    tarif: {
      type: String,
      enum: Object.values(MILAGE_TARIFS),
      default: MILAGE_TARIFS.EXTERN,
      required: true,
    },
    additionalCosts: [
      {
        name: { type: String, required: true },
        value: { type: Number, required: true },
      },
    ],
    status: {
      type: String,
      enum: Object.values(BILL_STATUS),
      default: BILL_STATUS.UNINVOICED,
    },
  },
  {
    timestamps: true,
    toJSON: { virtuals: true, getters: true },
    toObject: { virtuals: true, getters: true },
  }
)

BillSchema.virtual('milage').get(function () {
  const bill = this as BillDocument
  return bill.milageEnd - bill.milageStart
})

BillSchema.virtual('total').get(function () {
  const bill = this as BillDocument

  return getBillTotal(bill)
})

export default <BillModel>mongoose.models.Bill ||
  mongoose.model<BillDocument, BillModel>('Bill', BillSchema)