package handler_test

import (
	"context"
	"net/http"
	"os"
	"testing"

	"github.com/golang/mock/gomock"
	. "github.com/tus/tusd/pkg/handler"
)

func TestHead(t *testing.T) {
	SubTest(t, "Status", func(t *testing.T, store *MockFullDataStore, composer *StoreComposer) {
		ctrl := gomock.NewController(t)
		defer ctrl.Finish()
		locker := NewMockFullLocker(ctrl)
		lock := NewMockFullLock(ctrl)
		upload := NewMockFullUpload(ctrl)

		gomock.InOrder(
			locker.EXPECT().NewLock("yes").Return(lock, nil),
			lock.EXPECT().Lock().Return(nil),
			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
				Offset: 11,
				Size:   44,
				MetaData: map[string]string{
					"name":  "lunrjs.png",
					"empty": "",
				},
			}, nil),
			lock.EXPECT().Unlock().Return(nil),
		)

		composer = NewStoreComposer()
		composer.UseCore(store)
		composer.UseLocker(locker)

		handler, _ := NewHandler(Config{
			StoreComposer: composer,
		})

		res := (&httpTest{
			Method: "HEAD",
			URL:    "yes",
			ReqHeader: map[string]string{
				"Tus-Resumable": "1.0.0",
			},
			Code: http.StatusOK,
			ResHeader: map[string]string{
				"Upload-Offset": "11",
				"Upload-Length": "44",
				"Cache-Control": "no-store",
			},
		}).Run(handler, t)

		// Since the order of a map is not guaranteed in Go, we need to be prepared
		// for the case, that the order of the metadata may have been changed
		if v := res.Header().Get("Upload-Metadata"); v != "name bHVucmpzLnBuZw==,empty " &&
			v != "empty ,name bHVucmpzLnBuZw==" {
			t.Errorf("Expected valid metadata (got '%s')", v)
		}
	})

	SubTest(t, "UploadNotFoundFail", func(t *testing.T, store *MockFullDataStore, composer *StoreComposer) {
		store.EXPECT().GetUpload(context.Background(), "no").Return(nil, os.ErrNotExist)

		handler, _ := NewHandler(Config{
			StoreComposer: composer,
		})

		res := (&httpTest{
			Method: "HEAD",
			URL:    "no",
			ReqHeader: map[string]string{
				"Tus-Resumable": "1.0.0",
			},
			Code: http.StatusNotFound,
			ResHeader: map[string]string{
				"Content-Length": "0",
			},
		}).Run(handler, t)

		if res.Body.String() != "" {
			t.Errorf("Expected empty body for failed HEAD request")
		}
	})

	SubTest(t, "DeferLengthHeader", func(t *testing.T, store *MockFullDataStore, composer *StoreComposer) {
		ctrl := gomock.NewController(t)
		defer ctrl.Finish()
		upload := NewMockFullUpload(ctrl)

		gomock.InOrder(
			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
				SizeIsDeferred: true,
				Size:           0,
			}, nil),
		)

		handler, _ := NewHandler(Config{
			StoreComposer: composer,
		})

		(&httpTest{
			Method: "HEAD",
			URL:    "yes",
			ReqHeader: map[string]string{
				"Tus-Resumable": "1.0.0",
			},
			Code: http.StatusOK,
			ResHeader: map[string]string{
				"Upload-Defer-Length": "1",
			},
		}).Run(handler, t)
	})

	SubTest(t, "NoDeferLengthHeader", func(t *testing.T, store *MockFullDataStore, composer *StoreComposer) {
		ctrl := gomock.NewController(t)
		defer ctrl.Finish()
		upload := NewMockFullUpload(ctrl)

		gomock.InOrder(
			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
				SizeIsDeferred: false,
				Size:           10,
			}, nil),
		)

		handler, _ := NewHandler(Config{
			StoreComposer: composer,
		})

		(&httpTest{
			Method: "HEAD",
			URL:    "yes",
			ReqHeader: map[string]string{
				"Tus-Resumable": "1.0.0",
			},
			Code: http.StatusOK,
			ResHeader: map[string]string{
				"Upload-Defer-Length": "",
			},
		}).Run(handler, t)
	})
}