import * as mongoose from 'mongoose'
import { v4 as uuidv4 } from 'uuid'
import { startOfDay } from 'date-fns'
import { dateFormatBackend, getDays } from '../helpers/date'
import { Bill } from './bill'
import { Booker } from './booker'
import { BOOKING_STATUS } from './enums'

export interface Booking {
  uuid: string
  booker: Booker
  bill: Bill
  startDate: Date
  endDate: Date
  status: BOOKING_STATUS
  purpose?: string
  org?: string
  destination?: string
  days?: string[]
}

export interface BookingDocument
  extends Booking,
    mongoose.Document,
    mongoose.SchemaTimestampsConfig {}

export interface BookingModel extends mongoose.Model<BookingDocument> {
  findBookedDays(): Promise<string[]>
}

const BookingSchema = new mongoose.Schema<BookingDocument>(
  {
    // need a seperate uuid to be able to target a booking anonimously
    uuid: {
      type: String,
      default: uuidv4,
      index: true,
    },
    booker: {
      type: mongoose.Schema.Types.ObjectId,
      ref: 'Booker',
      required: true,
    },
    bill: {
      type: mongoose.Schema.Types.ObjectId,
      ref: 'Bill',
      required: false,
    },
    startDate: {
      type: Date,
      required: true,
      get: dateFormatBackend,
      min: new Date(),
    },
    endDate: {
      type: Date,
      required: false,
      get: dateFormatBackend,
      min: new Date(),
    },
    days: {
      type: [String],
      required: true,
    },
    status: {
      type: String,
      enum: Object.values(BOOKING_STATUS),
      required: true,
      default: 'requested',
    },
    purpose: { type: String, required: false },
    org: { type: String, required: false },
    destination: { type: String, required: false },
  },
  {
    timestamps: true,
    toJSON: { virtuals: true, getters: true },
    toObject: { virtuals: true, getters: true },
  }
)

BookingSchema.pre('save', function (next) {
  const booking = this as BookingDocument
  booking.days = getDays({
    startDate: new Date(booking.startDate),
    endDate: new Date(booking.endDate),
  })
  next()
})

BookingSchema.static('findBookedDays', async function (): Promise<string[]> {
  const model = this as BookingModel
  const bookedDays = await model
    .find(
      {
        status: { $in: [BOOKING_STATUS.REQUESTED, BOOKING_STATUS.CONFIRMED] },
        endDate: { $gt: startOfDay(new Date()) },
      },
      'days'
    )
    .exec()

  return bookedDays
    .map((b) => b.days)
    .flat()
    .sort()
})

export default <BookingModel>mongoose.models.Booking ||
  mongoose.model<BookingDocument, BookingModel>('Booking', BookingSchema)