package s3api

import (
	"fmt"
	"github.com/chrislusf/seaweedfs/weed/s3api/s3_constants"
	"net/http"
	"reflect"
	"sort"
	"strings"
	"testing"
)

type H map[string]string

func (h H) String() string {
	pairs := make([]string, 0, len(h))
	for k, v := range h {
		pairs = append(pairs, fmt.Sprintf("%s : %s", k, v))
	}
	sort.Strings(pairs)
	join := strings.Join(pairs, "\n")
	return "\n" + join + "\n"
}

var processMetadataTestCases = []struct {
	caseId   int
	request  H
	existing H
	getTags  H
	want     H
}{
	{
		201,
		H{
			"User-Agent":         "firefox",
			"X-Amz-Meta-My-Meta": "request",
			"X-Amz-Tagging":      "A=B&a=b&type=request",
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-Type": "existing",
		},
		H{
			"A":    "B",
			"a":    "b",
			"type": "existing",
		},
		H{
			"User-Agent":         "firefox",
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging":      "A=B&a=b&type=existing",
		},
	},
	{
		202,
		H{
			"User-Agent":                      "firefox",
			"X-Amz-Meta-My-Meta":              "request",
			"X-Amz-Tagging":                   "A=B&a=b&type=request",
			s3_constants.AmzUserMetaDirective: DirectiveReplace,
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-Type": "existing",
		},
		H{
			"A":    "B",
			"a":    "b",
			"type": "existing",
		},
		H{
			"User-Agent":                      "firefox",
			"X-Amz-Meta-My-Meta":              "request",
			"X-Amz-Tagging":                   "A=B&a=b&type=existing",
			s3_constants.AmzUserMetaDirective: DirectiveReplace,
		},
	},

	{
		203,
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			"X-Amz-Tagging":                        "A=B&a=b&type=request",
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-Type": "existing",
		},
		H{
			"A":    "B",
			"a":    "b",
			"type": "existing",
		},
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "existing",
			"X-Amz-Tagging":                        "A=B&a=b&type=request",
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
	},

	{
		204,
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			"X-Amz-Tagging":                        "A=B&a=b&type=request",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-Type": "existing",
		},
		H{
			"A":    "B",
			"a":    "b",
			"type": "existing",
		},
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			"X-Amz-Tagging":                        "A=B&a=b&type=request",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
	},

	{
		205,
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			"X-Amz-Tagging":                        "A=B&a=b&type=request",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
		H{},
		H{},
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			"X-Amz-Tagging":                        "A=B&a=b&type=request",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
	},

	{
		206,
		H{
			"User-Agent":                           "firefox",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-Type": "existing",
		},
		H{
			"A":    "B",
			"a":    "b",
			"type": "existing",
		},
		H{
			"User-Agent":                           "firefox",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
	},

	{
		207,
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-Type": "existing",
		},
		H{
			"A":    "B",
			"a":    "b",
			"type": "existing",
		},
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
	},
}
var processMetadataBytesTestCases = []struct {
	caseId   int
	request  H
	existing H
	want     H
}{
	{
		101,
		H{
			"User-Agent":         "firefox",
			"X-Amz-Meta-My-Meta": "request",
			"X-Amz-Tagging":      "A=B&a=b&type=request",
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "existing",
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "existing",
		},
	},

	{
		102,
		H{
			"User-Agent":                      "firefox",
			"X-Amz-Meta-My-Meta":              "request",
			"X-Amz-Tagging":                   "A=B&a=b&type=request",
			s3_constants.AmzUserMetaDirective: DirectiveReplace,
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "existing",
		},
		H{
			"X-Amz-Meta-My-Meta": "request",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "existing",
		},
	},

	{
		103,
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			"X-Amz-Tagging":                        "A=B&a=b&type=request",
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "existing",
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "request",
		},
	},

	{
		104,
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			"X-Amz-Tagging":                        "A=B&a=b&type=request",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "existing",
		},
		H{
			"X-Amz-Meta-My-Meta": "request",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "request",
		},
	},

	{
		105,
		H{
			"User-Agent":                           "firefox",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
		H{
			"X-Amz-Meta-My-Meta": "existing",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "existing",
		},
		H{},
	},

	{
		107,
		H{
			"User-Agent":                           "firefox",
			"X-Amz-Meta-My-Meta":                   "request",
			"X-Amz-Tagging":                        "A=B&a=b&type=request",
			s3_constants.AmzUserMetaDirective:      DirectiveReplace,
			s3_constants.AmzObjectTaggingDirective: DirectiveReplace,
		},
		H{},
		H{
			"X-Amz-Meta-My-Meta": "request",
			"X-Amz-Tagging-A":    "B",
			"X-Amz-Tagging-a":    "b",
			"X-Amz-Tagging-type": "request",
		},
	},
}

func TestProcessMetadata(t *testing.T) {
	for _, tc := range processMetadataTestCases {
		reqHeader := transferHToHeader(tc.request)
		existing := transferHToHeader(tc.existing)
		replaceMeta, replaceTagging := replaceDirective(reqHeader)

		err := processMetadata(reqHeader, existing, replaceMeta, replaceTagging, func(_ string, _ string) (tags map[string]string, err error) {
			return tc.getTags, nil
		}, "", "")
		if err != nil {
			t.Error(err)
		}

		result := transferHeaderToH(reqHeader)
		fmtTagging(result, tc.want)

		if !reflect.DeepEqual(result, tc.want) {
			t.Error(fmt.Errorf("\n### CaseID: %d ###"+
				"\nRequest:%v"+
				"\nExisting:%v"+
				"\nGetTags:%v"+
				"\nWant:%v"+
				"\nActual:%v",
				tc.caseId, tc.request, tc.existing, tc.getTags, tc.want, result))
		}
	}
}

func TestProcessMetadataBytes(t *testing.T) {
	for _, tc := range processMetadataBytesTestCases {
		reqHeader := transferHToHeader(tc.request)
		existing := transferHToBytesArr(tc.existing)
		replaceMeta, replaceTagging := replaceDirective(reqHeader)
		extends := processMetadataBytes(reqHeader, existing, replaceMeta, replaceTagging)

		result := transferBytesArrToH(extends)
		fmtTagging(result, tc.want)

		if !reflect.DeepEqual(result, tc.want) {
			t.Error(fmt.Errorf("\n### CaseID: %d ###"+
				"\nRequest:%v"+
				"\nExisting:%v"+
				"\nWant:%v"+
				"\nActual:%v",
				tc.caseId, tc.request, tc.existing, tc.want, result))
		}
	}
}

func fmtTagging(maps ...map[string]string) {
	for _, m := range maps {
		if tagging := m[s3_constants.AmzObjectTagging]; len(tagging) > 0 {
			split := strings.Split(tagging, "&")
			sort.Strings(split)
			m[s3_constants.AmzObjectTagging] = strings.Join(split, "&")
		}
	}
}

func transferHToHeader(data map[string]string) http.Header {
	header := http.Header{}
	for k, v := range data {
		header.Add(k, v)
	}
	return header
}

func transferHToBytesArr(data map[string]string) map[string][]byte {
	m := make(map[string][]byte, len(data))
	for k, v := range data {
		m[k] = []byte(v)
	}
	return m
}

func transferBytesArrToH(data map[string][]byte) H {
	m := make(map[string]string, len(data))
	for k, v := range data {
		m[k] = string(v)
	}
	return m
}

func transferHeaderToH(data map[string][]string) H {
	m := make(map[string]string, len(data))
	for k, v := range data {
		m[k] = v[len(v)-1]
	}
	return m
}