package xmpp

import (
	"encoding/xml"
	"strings"
	"testing"
)

// bufTest is a struct containing a test point for the
// xengineering.eu/limox/xmpp.elementBuffer. It contains a test XML string
// which has to be exactly one XML element and an array of indentation levels
// which have to be checked after each token which is parsed.
type bufTest struct {
	xml    string
	levels []int
}

func TestElementBuffer(t *testing.T) {
	tests := []bufTest{
		bufTest{`<stream></stream>`, []int{1, 0}},
		bufTest{`<stream/>`, []int{1, 0}},
		bufTest{`<a><b>testing</b></a>`, []int{1, 2, 2, 1, 0}},
		bufTest{`<a><!-- comment --><b>testing</b></a>`, []int{1, 1, 2, 2, 1, 0}},
		bufTest{`<!-- comment --><a><b>testing</b></a>`, []int{0, 1, 2, 2, 1, 0}},
	}

	for _, v := range tests {
		r := strings.NewReader(v.xml)
		d := xml.NewDecoder(r)
		b := newElementBuffer()

		i := 0

		for {
			token, err := d.Token()
			if err != nil {
				if i != len(v.levels) {
					t.Fatalf("Stopped parsing at unexpected index due to error `%v`!\n", err)
				}
				break
			}

			err = b.add(token)
			if err != nil {
				t.Fatalf("add(token) failed with error `%v`!\n", err)
			}

			if b.level != v.levels[i] {
				t.Fatalf("Indent level of xmpp.elementBuffer %d does not match value given by test data %d!\n", b.level, v.levels[i])
			}

			i += 1
		}
	}
}