package main

import (
	"slices"
	"strings"
	"testing"
)

// TestParseCSVReadsTodaysLayout parses an as.csv with the country code column
// that the source added after the description. It expects each AS with its
// handle and description spelled exactly as in the file, accents included.
func TestParseCSVReadsTodaysLayout(t *testing.T) {
	t.Parallel()

	const asCSV = `asn,handle,description,country-code
1,LVLT-1,Level 3 Parent LLC,US
1251,FUNDACAO-AMPARO-PESQUISA,FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO SÃO PAULO,BR
`

	got, err := parseCSV(strings.NewReader(asCSV))
	if err != nil {
		t.Fatalf("parseCSV: %v", err)
	}

	want := []ASInfo{
		{ASN: 1, Handle: "LVLT-1", Description: "Level 3 Parent LLC"},
		{
			ASN:    1251,
			Handle: "FUNDACAO-AMPARO-PESQUISA",
			Description: "FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO " +
				"SÃO PAULO",
		},
	}

	if !slices.Equal(got, want) {
		t.Errorf("parseCSV = %+v, want %+v", got, want)
	}
}

// TestParseCSVRejectsAnotherHeader parses files whose first columns are not
// the AS number, the handle and the description. It expects an error rather
// than a list read from the wrong columns.
func TestParseCSVRejectsAnotherHeader(t *testing.T) {
	t.Parallel()

	for _, asCSV := range []string{
		"asn,handle\n1,LVLT-1\n",
		"asn,description,handle\n1,Level 3 Parent LLC,LVLT-1\n",
	} {
		_, err := parseCSV(strings.NewReader(asCSV))
		if err == nil {
			t.Errorf("parseCSV(%q): no error", asCSV)
		}
	}
}