import { User } from '../../typeorm/entity/User'
import { TransactionList, Transaction } from '../models/Transaction'
import { UserTransaction } from '../../typeorm/entity/UserTransaction'

function calculateAndAddDecayTransactions(
    userTransactions:UserTransaction[],
    user: User, 
    decay:boolean, 
    skipFirstTransaction:boolean
): Transaction[]
{
    let transactions: Transaction[] = []

    return transactions
}


export default async function listTransactions(
    firstPage:number,
    items:number,
    order:"ASC" | "DESC",
    user:User) : Promise<TransactionList>
{

    let limit = items
    let offset = 0
    let skipFirstTransaction = false
    if(firstPage > 1) {
        offset = (( firstPage - 1 ) * items) - 1;
        limit++;
    }
        
    if(offset && order == 'ASC') {
        offset--;
    }
    let [userTransactions, userTransactionsCount] = await UserTransaction.findByUserPaged(user.id, limit, offset, order)
    skipFirstTransaction = userTransactionsCount > offset + limit
    const decay = !(firstPage > 1)
    let transactions: Transaction[] = []
    if(userTransactions.length) {
        if(order === 'DESC') {
            userTransactions = userTransactions.reverse()
        }
        let transactions = calculateAndAddDecayTransactions(userTransactions, user, decay, skipFirstTransaction)
        if(order === 'DESC') {
            transactions = transactions.reverse()
        }
    }

    const transactionList = new TransactionList({
        gdtSum: 0,
        count: userTransactionsCount,
        balance: 0,
        decay: 0,
        decay_date: '',
        transactions: transactions
    })

    return transactionList
}