/*
	Copyright 2022 Dolysis Consulting Limited

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at
		http://www.apache.org/licenses/LICENSE-2.0
	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.

	For changes see the git log
*/
package ipp

import (
	"bytes"
	"testing"
)

var attributeTestCases = []struct {
	Attribute string
	Value     interface{}
	Bytes     []byte
}{
	{
		Attribute: "job-id",
		Value:     1,
		Bytes:     []byte{33, 0, 6, 106, 111, 98, 45, 105, 100, 0, 4, 0, 0, 0, 1},
	},
	{
		Attribute: "printer-is-shared",
		Value:     false,
		Bytes:     []byte{34, 0, 17, 112, 114, 105, 110, 116, 101, 114, 45, 105, 115, 45, 115, 104, 97, 114, 101, 100, 0, 1, 0},
	},
	{
		Attribute: "purge-jobs",
		Value:     true,
		Bytes:     []byte{34, 0, 10, 112, 117, 114, 103, 101, 45, 106, 111, 98, 115, 0, 1, 1},
	},
	{
		Attribute: "printer-uri",
		Value:     "ipp://myserver:631/printers/myprinter",
		Bytes:     []byte{69, 0, 11, 112, 114, 105, 110, 116, 101, 114, 45, 117, 114, 105, 0, 37, 105, 112, 112, 58, 47, 47, 109, 121, 115, 101, 114, 118, 101, 114, 58, 54, 51, 49, 47, 112, 114, 105, 110, 116, 101, 114, 115, 47, 109, 121, 112, 114, 105, 110, 116, 101, 114},
	},
	{
		Attribute: "attributes-charset",
		Value:     "utf-8",
		Bytes:     []byte{71, 0, 18, 97, 116, 116, 114, 105, 98, 117, 116, 101, 115, 45, 99, 104, 97, 114, 115, 101, 116, 0, 5, 117, 116, 102, 45, 56},
	},
	{
		Attribute: "printer-state",
		Value:     3,
		Bytes:     []byte("\x23\x00\x0dprinter-state\x00\x04\x00\x00\x00\x03"),
	},
}

func TestAttributeEncoding(t *testing.T) {
	buf := new(bytes.Buffer)
	enc := NewAttributeEncoder(buf)

	for _, c := range attributeTestCases {
		if err := enc.Encode(c.Attribute, c.Value); err != nil {
			t.Errorf("error while encoding attribute %s with value %v: %v", c.Attribute, c.Value, err)
		}

		result := buf.Bytes()
		if !bytes.Equal(result, c.Bytes) {
			t.Errorf("encoding result is not correct, expected %v, got %v", c.Bytes, result)
		}

		buf.Reset()
	}
}

func TestAttributeDecoder(t *testing.T) {
	buf := new(bytes.Buffer)
	dec := NewAttributeDecoder(buf)

	for _, c := range attributeTestCases {
		tag := int8(c.Bytes[:1][0])

		buf.Write(c.Bytes[1:])

		attr, err := dec.Decode(tag)
		if err != nil {
			t.Errorf("error while decoding bytes %v: %v", c.Bytes, err)
		}

		if attr.Name != c.Attribute {
			t.Errorf("decoded attribute is not correct, expected %v, got %v", c.Attribute, attr.Name)
		}

		if attr.Value != c.Value {
			t.Errorf("decoded value is not correct, expected %v, got %v", c.Attribute, attr.Name)
		}

		buf.Reset()
	}
}