package parser

import "testing"

func TestParseAmount(t *testing.T) {
	cases := []struct {
		in        string
		decimal   string
		thousands string
		digits    int
		want      int64
	}{
		{"45.20", ".", "", 2, 4520},
		{"-45.20", ".", "", 2, -4520},
		{"45,20", ",", ".", 2, 4520},
		{"1.234,56", ",", ".", 2, 123456},
		{"1,234.56", ".", ",", 2, 123456},
		{"1 234.56", ".", " ", 2, 123456},
		{"45.20 EUR", ".", "", 2, 4520},
		{"BGN 45.20", ".", "", 2, 4520},
		{"45,20-", ",", "", 2, -4520},
		{"(45.20)", ".", "", 2, -4520},
		{"+45.20", ".", "", 2, 4520},
		{"0.00", ".", "", 2, 0},
		{".50", ".", "", 2, 50},
		{"45", ".", "", 2, 4500},
		{"45.2", ".", "", 2, 4520},
		{"45.205", ".", "", 2, 4521}, // round half away from zero
		{"45.204", ".", "", 2, 4520}, // round down
		{"-45.205", ".", "", 2, -4521},
		{"1234", ".", "", 0, 1234}, // zero-digit currency
		{"1234.6", ".", "", 0, 1235},
		{"1.234567", ".", "", 3, 1235},
		{"−45.20", ".", "", 2, -4520}, // U+2212 minus
	}
	for _, c := range cases {
		got, err := ParseAmount(c.in, c.decimal, c.thousands, c.digits)
		if err != nil {
			t.Errorf("ParseAmount(%q) error: %v", c.in, err)
			continue
		}
		if got != c.want {
			t.Errorf("ParseAmount(%q, decimal=%q, digits=%d) = %d, want %d",
				c.in, c.decimal, c.digits, got, c.want)
		}
	}
}

func TestParseAmountErrors(t *testing.T) {
	for _, in := range []string{"", "   ", "abc", "-", "."} {
		if v, err := ParseAmount(in, ".", "", 2); err == nil {
			t.Errorf("ParseAmount(%q) = %d, want error", in, v)
		}
	}
}