package ana

import (
	"testing"
	"time"

	"gogs.inhome.blapointe.com/ana-ledger/ledger"
)

func TestRegisterPrediction(t *testing.T) {
	t.Run("contribution", func(t *testing.T) {
		input := newTestRegister()

		got, err := RegisterWithContributionPrediction(input, time.Hour*24*365)
		if err != nil {
			t.Fatal(err)
		}
		t.Logf("%+v", got)

		if len(got) != len(input)+13 {
			t.Error(len(got))
		}

		for _, date := range got.Dates() {
			for _, name := range got.Names() {
				t.Logf("%s | %s = %+v", date, name, got[date][name])
				if ti, _ := dateToTime(date); ti.After(time.Now().Add(time.Hour*24*60)) && got[date][name]["XYZ"] == 0 {
					t.Error("predicting future contributions lost unmodified currency", got[date][name])
				}
			}
		}
	})
}

func newTestRegister() map[string]ledger.Balances {
	s := func(t time.Time) string {
		return t.Format("2006-01")
	}
	day := time.Hour * 24
	lastYear := time.Now().Add(-1 * day * time.Duration(time.Now().YearDay()))
	return map[string]ledger.Balances{
		s(lastYear.Add(day * 0)):   ledger.Balances{"X": ledger.Balance{ledger.USD: 1}},
		s(lastYear.Add(day * 32)):  ledger.Balances{"X": ledger.Balance{ledger.USD: 2}},
		s(lastYear.Add(day * 64)):  ledger.Balances{"X": ledger.Balance{ledger.USD: 3}},
		s(lastYear.Add(day * 94)):  ledger.Balances{"X": ledger.Balance{ledger.USD: 4}},
		s(lastYear.Add(day * 124)): ledger.Balances{"X": ledger.Balance{ledger.USD: 5}},
		s(lastYear.Add(day * 154)): ledger.Balances{"X": ledger.Balance{ledger.USD: 6}},
		s(lastYear.Add(day * 184)): ledger.Balances{"X": ledger.Balance{ledger.USD: 8}},
		s(lastYear.Add(day * 214)): ledger.Balances{"X": ledger.Balance{ledger.USD: 10}},
		s(lastYear.Add(day * 244)): ledger.Balances{"X": ledger.Balance{ledger.USD: 12}},
		s(lastYear.Add(day * 274)): ledger.Balances{"X": ledger.Balance{ledger.USD: 16, "XYZ": 1}},
	}
}