package processor

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestComputePointPaymentLimits(t *testing.T) {
	for name, c := range map[string]struct {
		total, paid, paidWithPoints float64
		percent, value, balance     int64
		wantRemaining, wantMax      int64
	}{
		// The F9 example: Rp 87.550 left, 50.000 EnakPoint, 100%, Rp 1 a point.
		"PRD example":                           {87550, 0, 0, 100, 1, 50000, 8755000, 50000},
		"balance covers it all":                 {87550, 0, 0, 100, 1, 100000, 8755000, 87550},
		"part already paid":                     {100000, 30000, 0, 100, 1, 100000, 7000000, 70000},
		"capped by percent":                     {100000, 0, 0, 50, 1, 100000, 10000000, 50000},
		"percent counts EnakPoint already used": {100000, 20000, 20000, 50, 1, 100000, 8000000, 30000},
		"percent cap already used":              {100000, 50000, 50000, 50, 1, 100000, 5000000, 0},
		"point worth more than Rp 1":            {87550, 0, 0, 100, 100, 1000, 8755000, 875},
		"nothing left":                          {50000, 50000, 0, 100, 1, 100000, 0, 0},
		"overpaid":                              {50000, 60000, 0, 100, 1, 100000, 0, 0},
		"no balance":                            {50000, 0, 0, 100, 1, 0, 5000000, 0},
		"cents left over":                       {10000.50, 0, 0, 100, 1, 100000, 1000050, 10000},
	} {
		got := computePointPaymentLimits(c.total, c.paid, c.paidWithPoints, c.percent, c.value, c.balance)
		assert.Equal(t, c.wantRemaining, got.RemainingCents, name)
		assert.Equal(t, c.wantMax, got.MaxPoints, name)
		assert.LessOrEqual(t, got.MaxPoints*c.value*100, got.RemainingCents, "%s: never more than what is left", name)
	}
}

func TestFormatRupiah(t *testing.T) {
	for n, want := range map[int64]string{0: "0", 999: "999", 1000: "1.000", 50000: "50.000", 1234567: "1.234.567"} {
		assert.Equal(t, want, formatRupiah(n))
	}
}