package pdu

import (
	"testing"
)

// region size
func TestCalculateSizeTypicalInstance(t *testing.T) {
	p := &SUBMIT_SM{
		service_type:           "test_service",
		source_addr:            "12345",
		destination_addr:       "67890",
		schedule_delivery_time: "",
		validity_period:        "",
		short_message:          "Hello, World!",
	}
	expectedSize := 16 + len(p.service_type) + 1 + 1 + len(p.source_addr) + 1 + 1 + len(p.destination_addr) + 1 + 1 + 1 + len(p.schedule_delivery_time) + len(p.validity_period) + 1 + 1 + 1 + 1 + 1 + len(p.short_message)
	actualSize := p.Size()
	if actualSize != expectedSize {
		t.Errorf("Expected size %d, but got %d", expectedSize, actualSize)
	}
}

func TestCalculateSizeMaxLengths(t *testing.T) {
	maxLen := 255
	p := &SUBMIT_SM{
		service_type:           string(make([]byte, maxLen)),
		source_addr:            string(make([]byte, maxLen)),
		destination_addr:       string(make([]byte, maxLen)),
		schedule_delivery_time: string(make([]byte, maxLen)),
		validity_period:        string(make([]byte, maxLen)),
		short_message:          string(make([]byte, maxLen)),
	}
	expectedSize := 16 + maxLen + 1 + 1 + maxLen + 1 + 1 + maxLen + 1 + 1 + 1 + maxLen + maxLen + 1 + 1 + 1 + 1 + 1 + maxLen
	actualSize := p.Size()
	if actualSize != expectedSize {
		t.Errorf("Expected size %d, but got %d", expectedSize, actualSize)
	}
}

func TestHandlesEmptyStringsForAllStringFields(t *testing.T) {
	p := &SUBMIT_SM{
		service_type:           "",
		source_addr:            "",
		destination_addr:       "",
		schedule_delivery_time: "",
		validity_period:        "",
		short_message:          "",
	}
	expectedSize := 16 + len(p.service_type) + 1 + 1 + len(p.source_addr) + 1 + 1 + len(p.destination_addr) + 1 + 1 + 1 + len(p.schedule_delivery_time) + len(p.validity_period) + 1 + 1 + 1 + 1 + 1 + len(p.short_message)
	actualSize := p.Size()
	if actualSize != expectedSize {
		t.Errorf("Expected size %d, but got %d", expectedSize, actualSize)
	}
}