package api

import (
	"encoding/json"
	"fmt"
	"testing"

	"github.com/grafana/grafana/pkg/api/dtos"
	"github.com/grafana/grafana/pkg/api/response"
	"github.com/grafana/grafana/pkg/api/routing"
	"github.com/grafana/grafana/pkg/bus"
	"github.com/grafana/grafana/pkg/models"
	"github.com/grafana/grafana/pkg/services/dashboards"
	"github.com/grafana/grafana/pkg/services/guardian"
	"github.com/grafana/grafana/pkg/setting"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestFolderPermissionAPIEndpoint(t *testing.T) {
	settings := setting.NewCfg()
	hs := &HTTPServer{Cfg: settings}

	t.Run("Given folder not exists", func(t *testing.T) {
		mock := &fakeFolderService{
			GetFolderByUIDError: models.ErrFolderNotFound,
		}

		origNewFolderService := dashboards.NewFolderService
		t.Cleanup(func() {
			dashboards.NewFolderService = origNewFolderService
		})
		mockFolderService(mock)

		loggedInUserScenarioWithRole(t, "When calling GET on", "GET", "/api/folders/uid/permissions", "/api/folders/:uid/permissions", models.ROLE_EDITOR, func(sc *scenarioContext) {
			callGetFolderPermissions(sc, hs)
			assert.Equal(t, 404, sc.resp.Code)
		})

		cmd := dtos.UpdateDashboardAclCommand{
			Items: []dtos.DashboardAclUpdateItem{
				{UserID: 1000, Permission: models.PERMISSION_ADMIN},
			},
		}

		updateFolderPermissionScenario(t, updatePermissionContext{
			desc:         "When calling POST on",
			url:          "/api/folders/uid/permissions",
			routePattern: "/api/folders/:uid/permissions",
			cmd:          cmd,
			fn: func(sc *scenarioContext) {
				callUpdateFolderPermissions(t, sc)
				assert.Equal(t, 404, sc.resp.Code)
			},
		}, hs)
	})

	t.Run("Given user has no admin permissions", func(t *testing.T) {
		origNewGuardian := guardian.New
		origNewFolderService := dashboards.NewFolderService
		t.Cleanup(func() {
			guardian.New = origNewGuardian
			dashboards.NewFolderService = origNewFolderService
		})

		guardian.MockDashboardGuardian(&guardian.FakeDashboardGuardian{CanAdminValue: false})

		mock := &fakeFolderService{
			GetFolderByUIDResult: &models.Folder{
				Id:    1,
				Uid:   "uid",
				Title: "Folder",
			},
		}

		mockFolderService(mock)

		loggedInUserScenarioWithRole(t, "When calling GET on", "GET", "/api/folders/uid/permissions", "/api/folders/:uid/permissions", models.ROLE_EDITOR, func(sc *scenarioContext) {
			callGetFolderPermissions(sc, hs)
			assert.Equal(t, 403, sc.resp.Code)
		})

		cmd := dtos.UpdateDashboardAclCommand{
			Items: []dtos.DashboardAclUpdateItem{
				{UserID: 1000, Permission: models.PERMISSION_ADMIN},
			},
		}

		updateFolderPermissionScenario(t, updatePermissionContext{
			desc:         "When calling POST on",
			url:          "/api/folders/uid/permissions",
			routePattern: "/api/folders/:uid/permissions",
			cmd:          cmd,
			fn: func(sc *scenarioContext) {
				callUpdateFolderPermissions(t, sc)
				assert.Equal(t, 403, sc.resp.Code)
			},
		}, hs)
	})

	t.Run("Given user has admin permissions and permissions to update", func(t *testing.T) {
		origNewGuardian := guardian.New
		origNewFolderService := dashboards.NewFolderService
		t.Cleanup(func() {
			guardian.New = origNewGuardian
			dashboards.NewFolderService = origNewFolderService
		})

		guardian.MockDashboardGuardian(&guardian.FakeDashboardGuardian{
			CanAdminValue:                    true,
			CheckPermissionBeforeUpdateValue: true,
			GetAclValue: []*models.DashboardAclInfoDTO{
				{OrgId: 1, DashboardId: 1, UserId: 2, Permission: models.PERMISSION_VIEW},
				{OrgId: 1, DashboardId: 1, UserId: 3, Permission: models.PERMISSION_EDIT},
				{OrgId: 1, DashboardId: 1, UserId: 4, Permission: models.PERMISSION_ADMIN},
				{OrgId: 1, DashboardId: 1, TeamId: 1, Permission: models.PERMISSION_VIEW},
				{OrgId: 1, DashboardId: 1, TeamId: 2, Permission: models.PERMISSION_ADMIN},
			},
		})

		mock := &fakeFolderService{
			GetFolderByUIDResult: &models.Folder{
				Id:    1,
				Uid:   "uid",
				Title: "Folder",
			},
		}

		mockFolderService(mock)

		loggedInUserScenarioWithRole(t, "When calling GET on", "GET", "/api/folders/uid/permissions", "/api/folders/:uid/permissions", models.ROLE_ADMIN, func(sc *scenarioContext) {
			callGetFolderPermissions(sc, hs)
			assert.Equal(t, 200, sc.resp.Code)

			var resp []*models.DashboardAclInfoDTO
			err := json.Unmarshal(sc.resp.Body.Bytes(), &resp)
			require.NoError(t, err)

			assert.Len(t, resp, 5)
			assert.Equal(t, int64(2), resp[0].UserId)
			assert.Equal(t, models.PERMISSION_VIEW, resp[0].Permission)
		})

		cmd := dtos.UpdateDashboardAclCommand{
			Items: []dtos.DashboardAclUpdateItem{
				{UserID: 1000, Permission: models.PERMISSION_ADMIN},
			},
		}

		updateFolderPermissionScenario(t, updatePermissionContext{
			desc:         "When calling POST on",
			url:          "/api/folders/uid/permissions",
			routePattern: "/api/folders/:uid/permissions",
			cmd:          cmd,
			fn: func(sc *scenarioContext) {
				callUpdateFolderPermissions(t, sc)
				assert.Equal(t, 200, sc.resp.Code)

				var resp struct {
					ID    int64
					Title string
				}
				err := json.Unmarshal(sc.resp.Body.Bytes(), &resp)
				require.NoError(t, err)

				assert.Equal(t, int64(1), resp.ID)
				assert.Equal(t, "Folder", resp.Title)
			},
		}, hs)
	})

	t.Run("When trying to update permissions with duplicate permissions", func(t *testing.T) {
		origNewGuardian := guardian.New
		origNewFolderService := dashboards.NewFolderService
		t.Cleanup(func() {
			guardian.New = origNewGuardian
			dashboards.NewFolderService = origNewFolderService
		})

		guardian.MockDashboardGuardian(&guardian.FakeDashboardGuardian{
			CanAdminValue:                    true,
			CheckPermissionBeforeUpdateValue: false,
			CheckPermissionBeforeUpdateError: guardian.ErrGuardianPermissionExists,
		})

		mock := &fakeFolderService{
			GetFolderByUIDResult: &models.Folder{
				Id:    1,
				Uid:   "uid",
				Title: "Folder",
			},
		}

		mockFolderService(mock)

		cmd := dtos.UpdateDashboardAclCommand{
			Items: []dtos.DashboardAclUpdateItem{
				{UserID: 1000, Permission: models.PERMISSION_ADMIN},
			},
		}

		updateFolderPermissionScenario(t, updatePermissionContext{
			desc:         "When calling POST on",
			url:          "/api/folders/uid/permissions",
			routePattern: "/api/folders/:uid/permissions",
			cmd:          cmd,
			fn: func(sc *scenarioContext) {
				callUpdateFolderPermissions(t, sc)
				assert.Equal(t, 400, sc.resp.Code)
			},
		}, hs)
	})

	t.Run("When trying to update team or user permissions with a role", func(t *testing.T) {
		role := models.ROLE_ADMIN
		cmds := []dtos.UpdateDashboardAclCommand{
			{
				Items: []dtos.DashboardAclUpdateItem{
					{UserID: 1000, Permission: models.PERMISSION_ADMIN, Role: &role},
				},
			},
			{
				Items: []dtos.DashboardAclUpdateItem{
					{TeamID: 1000, Permission: models.PERMISSION_ADMIN, Role: &role},
				},
			},
		}

		for _, cmd := range cmds {
			updateFolderPermissionScenario(t, updatePermissionContext{
				desc:         "When calling POST on",
				url:          "/api/folders/uid/permissions",
				routePattern: "/api/folders/:uid/permissions",
				cmd:          cmd,
				fn: func(sc *scenarioContext) {
					callUpdateFolderPermissions(t, sc)
					assert.Equal(t, 400, sc.resp.Code)
					respJSON, err := jsonMap(sc.resp.Body.Bytes())
					require.NoError(t, err)
					assert.Equal(t, models.ErrPermissionsWithRoleNotAllowed.Error(), respJSON["error"])
				},
			}, hs)
		}
	})

	t.Run("When trying to override inherited permissions with lower precedence", func(t *testing.T) {
		origNewGuardian := guardian.New
		origNewFolderService := dashboards.NewFolderService
		t.Cleanup(func() {
			guardian.New = origNewGuardian
			dashboards.NewFolderService = origNewFolderService
		})

		guardian.MockDashboardGuardian(&guardian.FakeDashboardGuardian{
			CanAdminValue:                    true,
			CheckPermissionBeforeUpdateValue: false,
			CheckPermissionBeforeUpdateError: guardian.ErrGuardianOverride},
		)

		mock := &fakeFolderService{
			GetFolderByUIDResult: &models.Folder{
				Id:    1,
				Uid:   "uid",
				Title: "Folder",
			},
		}

		mockFolderService(mock)

		cmd := dtos.UpdateDashboardAclCommand{
			Items: []dtos.DashboardAclUpdateItem{
				{UserID: 1000, Permission: models.PERMISSION_ADMIN},
			},
		}

		updateFolderPermissionScenario(t, updatePermissionContext{
			desc:         "When calling POST on",
			url:          "/api/folders/uid/permissions",
			routePattern: "/api/folders/:uid/permissions",
			cmd:          cmd,
			fn: func(sc *scenarioContext) {
				callUpdateFolderPermissions(t, sc)
				assert.Equal(t, 400, sc.resp.Code)
			},
		}, hs)
	})

	t.Run("Getting and updating folder permissions with hidden users", func(t *testing.T) {
		origNewGuardian := guardian.New
		origNewFolderService := dashboards.NewFolderService
		settings.HiddenUsers = map[string]struct{}{
			"hiddenUser":  {},
			testUserLogin: {},
		}
		t.Cleanup(func() {
			guardian.New = origNewGuardian
			dashboards.NewFolderService = origNewFolderService
			settings.HiddenUsers = make(map[string]struct{})
		})

		guardian.MockDashboardGuardian(&guardian.FakeDashboardGuardian{
			CanAdminValue:                    true,
			CheckPermissionBeforeUpdateValue: true,
			GetAclValue: []*models.DashboardAclInfoDTO{
				{OrgId: 1, DashboardId: 1, UserId: 2, UserLogin: "hiddenUser", Permission: models.PERMISSION_VIEW},
				{OrgId: 1, DashboardId: 1, UserId: 3, UserLogin: testUserLogin, Permission: models.PERMISSION_EDIT},
				{OrgId: 1, DashboardId: 1, UserId: 4, UserLogin: "user_1", Permission: models.PERMISSION_ADMIN},
			},
			GetHiddenAclValue: []*models.DashboardAcl{
				{OrgID: 1, DashboardID: 1, UserID: 2, Permission: models.PERMISSION_VIEW},
			},
		})

		mock := &fakeFolderService{
			GetFolderByUIDResult: &models.Folder{
				Id:    1,
				Uid:   "uid",
				Title: "Folder",
			},
		}

		mockFolderService(mock)

		var resp []*models.DashboardAclInfoDTO
		loggedInUserScenarioWithRole(t, "When calling GET on", "GET", "/api/folders/uid/permissions", "/api/folders/:uid/permissions", models.ROLE_ADMIN, func(sc *scenarioContext) {
			callGetFolderPermissions(sc, hs)
			assert.Equal(t, 200, sc.resp.Code)

			err := json.Unmarshal(sc.resp.Body.Bytes(), &resp)
			require.NoError(t, err)

			assert.Len(t, resp, 2)
			assert.Equal(t, int64(3), resp[0].UserId)
			assert.Equal(t, models.PERMISSION_EDIT, resp[0].Permission)
			assert.Equal(t, int64(4), resp[1].UserId)
			assert.Equal(t, models.PERMISSION_ADMIN, resp[1].Permission)
		})

		cmd := dtos.UpdateDashboardAclCommand{
			Items: []dtos.DashboardAclUpdateItem{
				{UserID: 1000, Permission: models.PERMISSION_ADMIN},
			},
		}
		for _, acl := range resp {
			cmd.Items = append(cmd.Items, dtos.DashboardAclUpdateItem{
				UserID:     acl.UserId,
				Permission: acl.Permission,
			})
		}
		assert.Len(t, cmd.Items, 3)

		updateFolderPermissionScenario(t, updatePermissionContext{
			desc:         "When calling POST on",
			url:          "/api/folders/uid/permissions",
			routePattern: "/api/folders/:uid/permissions",
			cmd:          cmd,
			fn: func(sc *scenarioContext) {
				origUpdateDashboardACL := updateDashboardACL
				t.Cleanup(func() {
					updateDashboardACL = origUpdateDashboardACL
				})
				var gotItems []*models.DashboardAcl
				updateDashboardACL = func(hs *HTTPServer, dashID int64, items []*models.DashboardAcl) error {
					gotItems = items
					return nil
				}

				sc.fakeReqWithParams("POST", sc.url, map[string]string{}).exec()
				assert.Equal(t, 200, sc.resp.Code)
				assert.Len(t, gotItems, 4)
			},
		}, hs)
	})
}

func callGetFolderPermissions(sc *scenarioContext, hs *HTTPServer) {
	sc.handlerFunc = hs.GetFolderPermissionList
	sc.fakeReqWithParams("GET", sc.url, map[string]string{}).exec()
}

func callUpdateFolderPermissions(t *testing.T, sc *scenarioContext) {
	t.Helper()

	origUpdateDashboardACL := updateDashboardACL
	t.Cleanup(func() {
		updateDashboardACL = origUpdateDashboardACL
	})
	updateDashboardACL = func(hs *HTTPServer, dashID int64, items []*models.DashboardAcl) error {
		return nil
	}

	sc.fakeReqWithParams("POST", sc.url, map[string]string{}).exec()
}

func updateFolderPermissionScenario(t *testing.T, ctx updatePermissionContext, hs *HTTPServer) {
	t.Run(fmt.Sprintf("%s %s", ctx.desc, ctx.url), func(t *testing.T) {
		defer bus.ClearBusHandlers()

		sc := setupScenarioContext(t, ctx.url)

		sc.defaultHandler = routing.Wrap(func(c *models.ReqContext) response.Response {
			sc.context = c
			sc.context.OrgId = testOrgID
			sc.context.UserId = testUserID

			return hs.UpdateFolderPermissions(c, ctx.cmd)
		})

		sc.m.Post(ctx.routePattern, sc.defaultHandler)

		ctx.fn(sc)
	})
}