// Copyright 2010 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package http

import (
	"encoding/json"
	"fmt"
	"reflect"
	"testing"
	"time"
)

var writeSetCookiesTests = []struct {
	Cookie *Cookie
	Raw    string
}{
	{
		&Cookie{Name: "cookie-1", Value: "v$1"},
		"cookie-1=v$1",
	},
	{
		&Cookie{Name: "cookie-2", Value: "two", MaxAge: 3600},
		"cookie-2=two; Max-Age=3600",
	},
	{
		&Cookie{Name: "cookie-3", Value: "three", Domain: ".example.com"},
		"cookie-3=three; Domain=.example.com",
	},
	{
		&Cookie{Name: "cookie-4", Value: "four", Path: "/restricted/"},
		"cookie-4=four; Path=/restricted/",
	},
}

func TestWriteSetCookies(t *testing.T) {
	for i, tt := range writeSetCookiesTests {
		if g, e := tt.Cookie.String(), tt.Raw; g != e {
			t.Errorf("Test %d, expecting:\n%s\nGot:\n%s\n", i, e, g)
			continue
		}
	}
}

type headerOnlyResponseWriter Header

func (ho headerOnlyResponseWriter) Header() Header {
	return Header(ho)
}

func (ho headerOnlyResponseWriter) Write([]byte) (int, error) {
	panic("NOIMPL")
}

func (ho headerOnlyResponseWriter) WriteHeader(int) {
	panic("NOIMPL")
}

func TestSetCookie(t *testing.T) {
	m := make(Header)
	SetCookie(headerOnlyResponseWriter(m), &Cookie{Name: "cookie-1", Value: "one", Path: "/restricted/"})
	SetCookie(headerOnlyResponseWriter(m), &Cookie{Name: "cookie-2", Value: "two", MaxAge: 3600})
	if l := len(m["Set-Cookie"]); l != 2 {
		t.Fatalf("expected %d cookies, got %d", 2, l)
	}
	if g, e := m["Set-Cookie"][0], "cookie-1=one; Path=/restricted/"; g != e {
		t.Errorf("cookie #1: want %q, got %q", e, g)
	}
	if g, e := m["Set-Cookie"][1], "cookie-2=two; Max-Age=3600"; g != e {
		t.Errorf("cookie #2: want %q, got %q", e, g)
	}
}

var addCookieTests = []struct {
	Cookies []*Cookie
	Raw     string
}{
	{
		[]*Cookie{},
		"",
	},
	{
		[]*Cookie{{Name: "cookie-1", Value: "v$1"}},
		"cookie-1=v$1",
	},
	{
		[]*Cookie{
			{Name: "cookie-1", Value: "v$1"},
			{Name: "cookie-2", Value: "v$2"},
			{Name: "cookie-3", Value: "v$3"},
		},
		"cookie-1=v$1; cookie-2=v$2; cookie-3=v$3",
	},
}

func TestAddCookie(t *testing.T) {
	for i, tt := range addCookieTests {
		req, _ := NewRequest("GET", "http://example.com/", nil)
		for _, c := range tt.Cookies {
			req.AddCookie(c)
		}
		if g := req.Header.Get("Cookie"); g != tt.Raw {
			t.Errorf("Test %d:\nwant: %s\n got: %s\n", i, tt.Raw, g)
			continue
		}
	}
}

var readSetCookiesTests = []struct {
	Header  Header
	Cookies []*Cookie
}{
	{
		Header{"Set-Cookie": {"Cookie-1=v$1"}},
		[]*Cookie{{Name: "Cookie-1", Value: "v$1", Raw: "Cookie-1=v$1"}},
	},
	{
		Header{"Set-Cookie": {"NID=99=YsDT5i3E-CXax-; expires=Wed, 23-Nov-2011 01:05:03 GMT; path=/; domain=.google.ch; HttpOnly"}},
		[]*Cookie{{
			Name:       "NID",
			Value:      "99=YsDT5i3E-CXax-",
			Path:       "/",
			Domain:     ".google.ch",
			HttpOnly:   true,
			Expires:    time.Date(2011, 11, 23, 1, 5, 3, 0, time.UTC),
			RawExpires: "Wed, 23-Nov-2011 01:05:03 GMT",
			Raw:        "NID=99=YsDT5i3E-CXax-; expires=Wed, 23-Nov-2011 01:05:03 GMT; path=/; domain=.google.ch; HttpOnly",
		}},
	},
	{
		Header{"Set-Cookie": {".ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly"}},
		[]*Cookie{{
			Name:       ".ASPXAUTH",
			Value:      "7E3AA",
			Path:       "/",
			Expires:    time.Date(2012, 3, 7, 14, 25, 6, 0, time.UTC),
			RawExpires: "Wed, 07-Mar-2012 14:25:06 GMT",
			HttpOnly:   true,
			Raw:        ".ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly",
		}},
	},
	{
		Header{"Set-Cookie": {"ASP.NET_SessionId=foo; path=/; HttpOnly"}},
		[]*Cookie{{
			Name:     "ASP.NET_SessionId",
			Value:    "foo",
			Path:     "/",
			HttpOnly: true,
			Raw:      "ASP.NET_SessionId=foo; path=/; HttpOnly",
		}},
	},

	// TODO(bradfitz): users have reported seeing this in the
	// wild, but do browsers handle it? RFC 6265 just says "don't
	// do that" (section 3) and then never mentions header folding
	// again.
	// Header{"Set-Cookie": {"ASP.NET_SessionId=foo; path=/; HttpOnly, .ASPXAUTH=7E3AA; expires=Wed, 07-Mar-2012 14:25:06 GMT; path=/; HttpOnly"}},
}

func toJSON(v interface{}) string {
	b, err := json.Marshal(v)
	if err != nil {
		return fmt.Sprintf("%#v", v)
	}
	return string(b)
}

func TestReadSetCookies(t *testing.T) {
	for i, tt := range readSetCookiesTests {
		for n := 0; n < 2; n++ { // to verify readSetCookies doesn't mutate its input
			c := readSetCookies(tt.Header)
			if !reflect.DeepEqual(c, tt.Cookies) {
				t.Errorf("#%d readSetCookies: have\n%s\nwant\n%s\n", i, toJSON(c), toJSON(tt.Cookies))
				continue
			}
		}
	}
}

var readCookiesTests = []struct {
	Header  Header
	Filter  string
	Cookies []*Cookie
}{
	{
		Header{"Cookie": {"Cookie-1=v$1", "c2=v2"}},
		"",
		[]*Cookie{
			{Name: "Cookie-1", Value: "v$1"},
			{Name: "c2", Value: "v2"},
		},
	},
	{
		Header{"Cookie": {"Cookie-1=v$1", "c2=v2"}},
		"c2",
		[]*Cookie{
			{Name: "c2", Value: "v2"},
		},
	},
	{
		Header{"Cookie": {"Cookie-1=v$1; c2=v2"}},
		"",
		[]*Cookie{
			{Name: "Cookie-1", Value: "v$1"},
			{Name: "c2", Value: "v2"},
		},
	},
	{
		Header{"Cookie": {"Cookie-1=v$1; c2=v2"}},
		"c2",
		[]*Cookie{
			{Name: "c2", Value: "v2"},
		},
	},
}

func TestReadCookies(t *testing.T) {
	for i, tt := range readCookiesTests {
		for n := 0; n < 2; n++ { // to verify readCookies doesn't mutate its input                                                  
			c := readCookies(tt.Header, tt.Filter)
			if !reflect.DeepEqual(c, tt.Cookies) {
				t.Errorf("#%d readCookies:\nhave: %s\nwant: %s\n", i, toJSON(c), toJSON(tt.Cookies))
				continue
			}
		}
	}
}