package csvimport

import (
	"strings"
	"testing"
)

func TestParseOK(t *testing.T) {
	rows, err := Parse(strings.NewReader("a@x,p1,a@y,p2\nb@x,p3,b@y,p4\n"))
	if err != nil {
		t.Fatalf("parse: %v", err)
	}
	if len(rows) != 2 || rows[0].SrcLogin != "a@x" || rows[1].DstPass != "p4" {
		t.Fatalf("bad rows: %+v", rows)
	}
}

func TestParseRejectsBadColumns(t *testing.T) {
	if _, err := Parse(strings.NewReader("a,b,c\n")); err == nil {
		t.Fatal("3 columns must error")
	}
}

func TestParseRejectsDuplicateSrc(t *testing.T) {
	if _, err := Parse(strings.NewReader("a@x,p,a@y,p\na@x,q,c@y,q\n")); err == nil {
		t.Fatal("duplicate src_login must error")
	}
}

func TestParseRejectsEmptyField(t *testing.T) {
	if _, err := Parse(strings.NewReader("a@x,,a@y,p\n")); err == nil {
		t.Fatal("empty password must error")
	}
}

func TestParseBlankLineKeepsCorrectLineNumber(t *testing.T) {
	// blank physical line 2, malformed row on physical line 3
	_, err := Parse(strings.NewReader("a@x,p1,a@y,p2\n\nbad,row,here\n"))
	if err == nil {
		t.Fatal("expected error for 3-column row")
	}
	if !strings.Contains(err.Error(), "line 3") {
		t.Fatalf("error must reference physical line 3, got: %v", err)
	}
}

func TestParseZeroRowsErrors(t *testing.T) {
	if _, err := Parse(strings.NewReader("\n\n   \n")); err == nil {
		t.Fatal("expected error when no rows parsed")
	}
}