package upgrade

import (
	"bytes"
	"io"
	"testing"
)

func TestEOFSocket(t *testing.T) {

	socket := &bytes.Buffer{}

	_, err := Parse(socket)

	if err == nil {
		t.Fatalf("Empty socket expected EOF, got no error")
	} else if err != io.ErrUnexpectedEOF {
		t.Fatalf("Empty socket expected EOF, got '%s'", err)
	}

}

func TestInvalidRequestLine(t *testing.T) {

	socket := &bytes.Buffer{}
	cases := []struct {
		Reqline  string
		HasError bool
	}{
		{"abc", true},
		{"a  c", true},
		{"a    c", true},
		{"a c", true},
		{"a b c", true},

		{"GET invaliduri HTTP/1.1", true},
		{"GET /validuri HTTP/1.1", false},

		{"POST /validuri HTTP/1.1", true},
		{"PUT /validuri HTTP/1.1", true},
		{"DELETE /validuri HTTP/1.1", true},
		{"OPTIONS /validuri HTTP/1.1", true},
		{"UNKNOWN /validuri HTTP/1.1", true},

		{"GET / HTTP", true},
		{"GET / HTTP/", true},
		{"GET / 1.1", true},
		{"GET / 1", true},
		{"GET / HTTP/52", true},
		{"GET / HTTP/1.", true},
		{"GET / HTTP/.1", true},
		{"GET / HTTP/1.1", false},
		{"GET / HTTP/2", false},
	}

	for ti, tc := range cases {

		socket.Reset()
		socket.Write([]byte(tc.Reqline))
		socket.Write([]byte("\r\n\r\n"))

		_, err := Parse(socket)

		if !tc.HasError {

			// no error -> ok
			if err == nil {
				continue
				// error for the end of the request -> ok
			} else if _, ok := err.(*IncompleteRequest); ok {
				continue
			}

			t.Errorf("[%d] Expected no error", ti)
		}

		// missing required error -> error
		if tc.HasError && err == nil {
			t.Errorf("[%d] Expected error", ti)
			continue
		}

		ir, ok := err.(*InvalidRequest)

		// not InvalidRequest err -> error
		if !ok || ir.Field != "Request-Line" {
			t.Errorf("[%d] expected InvalidRequest", ti)
			continue
		}

	}

}

func TestInvalidHost(t *testing.T) {

	requestLine := []byte("GET / HTTP/1.1\r\n")

	socket := &bytes.Buffer{}
	cases := []struct {
		Host     string
		HasError bool
	}{
		{"1", true},
		{"12", true},
		{"123", true},
		{"1234", false},

		{"singlevalue", false},
		{"multi value", true},

		{"singlevalue:1", false},
		{"singlevalue:", true},
		{"singlevalue:x", true},
		{"xx:x", true},
		{":xxx", true},
		{"xxx:", true},
		{"a:12", false},

		{"google.com", false},
		{"8.8.8.8", false},
		{"google.com:8080", false},
		{"8.8.8.8:8080", false},
	}

	for ti, tc := range cases {

		socket.Reset()
		socket.Write(requestLine)
		socket.Write([]byte("Host: "))
		socket.Write([]byte(tc.Host))
		socket.Write([]byte("\r\n\r\n"))

		_, err := Parse(socket)

		if !tc.HasError {

			// no error -> ok
			if err == nil {
				continue
				// error for the end of the request -> ok
			} else if _, ok := err.(*IncompleteRequest); ok {
				continue
			}

			t.Errorf("[%d] Expected no error; %s", ti, err)
		}

		// missing required error -> error
		if tc.HasError && err == nil {
			t.Errorf("[%d] Expected error", ti)
			continue
		}

		// check if InvalidRequest
		ir, ok := err.(*InvalidRequest)

		// not InvalidRequest err -> error
		if ok && ir.Field != "Host" {
			t.Errorf("[%d] expected InvalidRequest", ti)
			continue
		}

	}

}