// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

package app

import (
	"context"
	"errors"
	"fmt"
	"os"
	"reflect"

	"github.com/hashicorp/go-multierror"
	"github.com/mattermost/mattermost/server/public/model"
	"github.com/mattermost/mattermost/server/public/shared/mlog"
	"github.com/mattermost/mattermost/server/public/shared/request"
	"github.com/mattermost/mattermost/server/public/utils"
	"github.com/mattermost/mattermost/server/v8/channels/store"
)

const (
	EmojisPermissionsMigrationKey                  = "EmojisPermissionsMigrationComplete"
	GuestRolesCreationMigrationKey                 = "GuestRolesCreationMigrationComplete"
	SystemConsoleRolesCreationMigrationKey         = "SystemConsoleRolesCreationMigrationComplete"
	CustomGroupAdminRoleCreationMigrationKey       = "CustomGroupAdminRoleCreationMigrationComplete"
	SharedChannelManagerRoleCreationMigrationKey   = "SystemSharedChannelManagerRoleCreationMigrationComplete"
	ContentExtractionConfigDefaultTrueMigrationKey = "ContentExtractionConfigDefaultTrueMigrationComplete"
	PlaybookRolesCreationMigrationKey              = "PlaybookRolesCreationMigrationComplete"
	FirstAdminSetupCompleteKey                     = model.SystemFirstAdminSetupComplete
	remainingSchemaMigrationsKey                   = "RemainingSchemaMigrations"
	postPriorityConfigDefaultTrueMigrationKey      = "PostPriorityConfigDefaultTrueMigrationComplete"
	contentFlaggingSetupDoneKey                    = "content_flagging_setup_done"
	contentFlaggingMigrationVersion                = "v5"
	managedCategorySetupDoneKey                    = "managed_category_setup_done"
	managedCategoryMigrationVersion                = "v2"
	cpaDisplayNameBackfillKey                      = "cpa_display_name_backfill_done"

	contentFlaggingPropertyNameFlaggedPostId       = "flagged_post_id"
	ContentFlaggingPropertyNameStatus              = "status"
	contentFlaggingPropertyNameReportingUserID     = "reporting_user_id"
	contentFlaggingPropertyNameReportingReason     = "reporting_reason"
	contentFlaggingPropertyNameReportingComment    = "reporting_comment"
	contentFlaggingPropertyNameReportingTime       = "reporting_time"
	contentFlaggingPropertyNameReviewerUserID      = "reviewer_user_id"
	contentFlaggingPropertyNameActorUserID         = "actor_user_id"
	contentFlaggingPropertyNameActorComment        = "actor_comment"
	contentFlaggingPropertyNameActionTime          = "action_time"
	contentFlaggingPropertyManageByContentFlagging = "content_flagging_managed"

	contentFlaggingPropertySubTypeTimestamp = "timestamp"

	boardsPropertySetupDoneKey     = "boards_property_setup_done"
	boardsPropertyMigrationVersion = "v1"
)

// This function migrates the default built in roles from code/config to the database.
func (a *App) DoAdvancedPermissionsMigration() error {
	return a.Srv().doAdvancedPermissionsMigration()
}

func (s *Server) doAdvancedPermissionsMigration() error {
	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(model.AdvancedPermissionsMigrationKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	mlog.Info("Migrating roles to database.")
	roles := model.MakeDefaultRoles()

	var multiErr *multierror.Error
	for _, role := range roles {
		_, err := s.Store().Role().Save(role)
		if err == nil {
			continue
		}
		mlog.Warn("Couldn't save the role for advanced permissions migration, this can be an expected case", mlog.Err(err))

		// If this failed for reasons other than the role already existing, don't mark the migration as done.
		fetchedRole, err := s.Store().Role().GetByName(context.Background(), role.Name)
		if err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to migrate role to database: %w", err))
			continue
		}

		// If the role already existed, check it is the same and update if not.
		if !reflect.DeepEqual(fetchedRole.Permissions, role.Permissions) ||
			fetchedRole.DisplayName != role.DisplayName ||
			fetchedRole.Description != role.Description ||
			fetchedRole.SchemeManaged != role.SchemeManaged {
			role.Id = fetchedRole.Id
			if _, err = s.Store().Role().Save(role); err != nil {
				// Role is not the same, but failed to update.
				multiErr = multierror.Append(multiErr, fmt.Errorf("failed to migrate role to database: %w", err))
			}
		}
	}

	if multiErr != nil {
		return multiErr
	}

	config := s.platform.Config()
	*config.ServiceSettings.PostEditTimeLimit = -1
	if _, _, err := s.platform.SaveConfig(config, true); err != nil {
		return fmt.Errorf("failed to update config in Advanced Permissions Phase 1 Migration: %w", err)
	}

	system := model.System{
		Name:  model.AdvancedPermissionsMigrationKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark advanced permissions migration as completed: %w", err)
	}

	return nil
}

func (a *App) SetPhase2PermissionsMigrationStatus(isComplete bool) error {
	if !isComplete {
		if _, err := a.Srv().Store().System().PermanentDeleteByName(model.MigrationKeyAdvancedPermissionsPhase2); err != nil {
			return err
		}
	}
	a.Srv().phase2PermissionsMigrationComplete = isComplete
	return nil
}

func (a *App) DoEmojisPermissionsMigration() error {
	if err := a.Srv().doEmojisPermissionsMigration(); err != nil {
		return fmt.Errorf("Failed to complete emojis permissions migration: %w", err)
	}
	return nil
}

func (s *Server) doEmojisPermissionsMigration() error {
	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(EmojisPermissionsMigrationKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	var role *model.Role
	var systemAdminRole *model.Role
	var err *model.AppError

	mlog.Info("Migrating emojis config to database.")

	// Emoji creation is set to all by default
	role, err = s.GetRoleByName(context.Background(), model.SystemUserRoleId)
	if err != nil {
		return fmt.Errorf("failed to get role for system user: %w", err)
	}

	if role != nil {
		role.Permissions = append(role.Permissions, model.PermissionCreateEmojis.Id, model.PermissionDeleteEmojis.Id)
		if _, nErr := s.Store().Role().Save(role); nErr != nil {
			return fmt.Errorf("failed to save role: %w", nErr)
		}
	}

	systemAdminRole, err = s.GetRoleByName(context.Background(), model.SystemAdminRoleId)
	if err != nil {
		return fmt.Errorf("failed to get role for system admin: %w", err)
	}

	systemAdminRole.Permissions = append(systemAdminRole.Permissions,
		model.PermissionCreateEmojis.Id,
		model.PermissionDeleteEmojis.Id,
		model.PermissionDeleteOthersEmojis.Id,
	)
	if _, err := s.Store().Role().Save(systemAdminRole); err != nil {
		return fmt.Errorf("failed to save role: %w", err)
	}

	system := model.System{
		Name:  EmojisPermissionsMigrationKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark emojis permissions migration as completed: %w", err)
	}

	return nil
}

func (a *App) DoGuestRolesCreationMigration() error {
	if err := a.Srv().doGuestRolesCreationMigration(); err != nil {
		return fmt.Errorf("Failed to complete guest roles creation migration: %w", err)
	}
	return nil
}

func (s *Server) doGuestRolesCreationMigration() error {
	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(GuestRolesCreationMigrationKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	roles := model.MakeDefaultRoles()
	var multiErr *multierror.Error
	if _, err := s.Store().Role().GetByName(context.Background(), model.ChannelGuestRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.ChannelGuestRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new guest role to database: %w", err))
		}
	}
	if _, err := s.Store().Role().GetByName(context.Background(), model.TeamGuestRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.TeamGuestRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new guest role to database: %w", err))
		}
	}
	if _, err := s.Store().Role().GetByName(context.Background(), model.SystemGuestRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.SystemGuestRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new guest role to database: %w", err))
		}
	}

	schemes, err := s.Store().Scheme().GetAllPage("", 0, 1000000)
	if err != nil {
		multiErr = multierror.Append(multiErr, fmt.Errorf("failed to get all schemes: %w", err))
	}
	for _, scheme := range schemes {
		if scheme.DefaultTeamGuestRole == "" || scheme.DefaultChannelGuestRole == "" {
			if scheme.Scope == model.SchemeScopeTeam {
				// Team Guest Role
				teamGuestRole := &model.Role{
					Name:          model.NewId(),
					DisplayName:   fmt.Sprintf("Team Guest Role for Scheme %s", scheme.Name),
					Permissions:   roles[model.TeamGuestRoleId].Permissions,
					SchemeManaged: true,
				}

				if savedRole, err := s.Store().Role().Save(teamGuestRole); err != nil {
					multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new guest role for custom scheme: %w", err))
				} else {
					scheme.DefaultTeamGuestRole = savedRole.Name
				}
			}

			// Channel Guest Role
			channelGuestRole := &model.Role{
				Name:          model.NewId(),
				DisplayName:   fmt.Sprintf("Channel Guest Role for Scheme %s", scheme.Name),
				Permissions:   roles[model.ChannelGuestRoleId].Permissions,
				SchemeManaged: true,
			}

			if savedRole, err := s.Store().Role().Save(channelGuestRole); err != nil {
				multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new guest role for custom scheme: %w", err))
			} else {
				scheme.DefaultChannelGuestRole = savedRole.Name
			}

			_, err := s.Store().Scheme().Save(scheme)
			if err != nil {
				multiErr = multierror.Append(multiErr, fmt.Errorf("failed to update custom scheme: %w", err))
			}
		}
	}

	if multiErr != nil {
		return multiErr
	}

	system := model.System{
		Name:  GuestRolesCreationMigrationKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark guest roles creation migration as completed: %w", err)
	}

	return nil
}

func (a *App) DoSystemConsoleRolesCreationMigration() error {
	return a.Srv().doSystemConsoleRolesCreationMigration()
}

func (s *Server) doSystemConsoleRolesCreationMigration() error {
	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(SystemConsoleRolesCreationMigrationKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	roles := model.MakeDefaultRoles()
	var multiErr *multierror.Error
	if _, err := s.Store().Role().GetByName(context.Background(), model.SystemManagerRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.SystemManagerRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new role %q: %w", model.SystemManagerRoleId, err))
		}
	}
	if _, err := s.Store().Role().GetByName(context.Background(), model.SystemReadOnlyAdminRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.SystemReadOnlyAdminRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new role %q: %w", model.SystemReadOnlyAdminRoleId, err))
		}
	}
	if _, err := s.Store().Role().GetByName(context.Background(), model.SystemUserManagerRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.SystemUserManagerRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new role %q: %w", model.SystemUserManagerRoleId, err))
		}
	}

	if multiErr != nil {
		return multiErr
	}

	system := model.System{
		Name:  SystemConsoleRolesCreationMigrationKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark system console roles creation migration as completed: %w", err)
	}

	return nil
}

func (s *Server) doSingleRoleCreationMigration(migrationKey, roleId string) error {
	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(migrationKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	roles := model.MakeDefaultRoles()
	role := roles[roleId]
	if role == nil {
		return fmt.Errorf("unknown role id: %q", roleId)
	}
	var nfRoleErr *store.ErrNotFound
	if _, err := s.Store().Role().GetByName(context.Background(), roleId); err != nil {
		if !errors.As(err, &nfRoleErr) {
			return fmt.Errorf("could not query role %q: %w", roleId, err)
		}
		if _, err := s.Store().Role().Save(role); err != nil {
			return fmt.Errorf("failed to create new role %q: %w", roleId, err)
		}
	}

	system := model.System{
		Name:  migrationKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark %s migration as completed: %w", migrationKey, err)
	}

	return nil
}

func (s *Server) doCustomGroupAdminRoleCreationMigration() error {
	return s.doSingleRoleCreationMigration(CustomGroupAdminRoleCreationMigrationKey, model.SystemCustomGroupAdminRoleId)
}

func (s *Server) doSharedChannelManagerRoleCreationMigration() error {
	return s.doSingleRoleCreationMigration(SharedChannelManagerRoleCreationMigrationKey, model.SharedChannelManagerRoleId)
}

func (s *Server) doContentExtractionConfigDefaultTrueMigration() error {
	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(ContentExtractionConfigDefaultTrueMigrationKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	s.platform.UpdateConfig(func(config *model.Config) {
		config.FileSettings.ExtractContent = new(true)
	})

	system := model.System{
		Name:  ContentExtractionConfigDefaultTrueMigrationKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark content extraction config migration as completed: %w", err)
	}

	return nil
}

func (s *Server) doPlaybooksRolesCreationMigration() error {
	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(PlaybookRolesCreationMigrationKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	roles := model.MakeDefaultRoles()
	var multiErr *multierror.Error
	if _, err := s.Store().Role().GetByName(context.Background(), model.PlaybookAdminRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.PlaybookAdminRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new playbook %q role to database: %w", model.PlaybookAdminRoleId, err))
		}
	}
	if _, err := s.Store().Role().GetByName(context.Background(), model.PlaybookMemberRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.PlaybookMemberRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new playbook %q role to database: %w", model.PlaybookMemberRoleId, err))
		}
	}
	if _, err := s.Store().Role().GetByName(context.Background(), model.RunAdminRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.RunAdminRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("ffailed to create new playbook %q role to database: %w", model.RunAdminRoleId, err))
		}
	}
	if _, err := s.Store().Role().GetByName(context.Background(), model.RunMemberRoleId); err != nil {
		if _, err := s.Store().Role().Save(roles[model.RunMemberRoleId]); err != nil {
			multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new playbook %q role to database: %w", model.RunMemberRoleId, err))
		}
	}
	schemes, err := s.Store().Scheme().GetAllPage(model.SchemeScopeTeam, 0, 1000000)
	if err != nil {
		multiErr = multierror.Append(multiErr, fmt.Errorf("failed to get all schemes: %w", err))
	}

	for _, scheme := range schemes {
		if scheme.Scope == model.SchemeScopeTeam {
			if scheme.DefaultPlaybookAdminRole == "" {
				playbookAdminRole := &model.Role{
					Name:          model.NewId(),
					DisplayName:   fmt.Sprintf("Playbook Admin Role for Scheme %s", scheme.Name),
					Permissions:   roles[model.PlaybookAdminRoleId].Permissions,
					SchemeManaged: true,
				}

				if savedRole, err := s.Store().Role().Save(playbookAdminRole); err != nil {
					multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new playbook %q role for existing custom scheme: %w", model.PlaybookAdminRoleId, err))
				} else {
					scheme.DefaultPlaybookAdminRole = savedRole.Name
				}
			}
			if scheme.DefaultPlaybookMemberRole == "" {
				playbookMember := &model.Role{
					Name:          model.NewId(),
					DisplayName:   fmt.Sprintf("Playbook Member Role for Scheme %s", scheme.Name),
					Permissions:   roles[model.PlaybookMemberRoleId].Permissions,
					SchemeManaged: true,
				}

				if savedRole, err := s.Store().Role().Save(playbookMember); err != nil {
					multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new playbook %q role for existing custom scheme: %w", model.PlaybookMemberRoleId, err))
				} else {
					scheme.DefaultPlaybookMemberRole = savedRole.Name
				}
			}

			if scheme.DefaultRunAdminRole == "" {
				runAdminRole := &model.Role{
					Name:          model.NewId(),
					DisplayName:   fmt.Sprintf("Run Admin Role for Scheme %s", scheme.Name),
					Permissions:   roles[model.RunAdminRoleId].Permissions,
					SchemeManaged: true,
				}

				if savedRole, err := s.Store().Role().Save(runAdminRole); err != nil {
					multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new playbook %q role for existing custom scheme: %w", model.RunAdminRoleId, err))
				} else {
					scheme.DefaultRunAdminRole = savedRole.Name
				}
			}

			if scheme.DefaultRunMemberRole == "" {
				runMemberRole := &model.Role{
					Name:          model.NewId(),
					DisplayName:   fmt.Sprintf("Run Member Role for Scheme %s", scheme.Name),
					Permissions:   roles[model.RunMemberRoleId].Permissions,
					SchemeManaged: true,
				}

				if savedRole, err := s.Store().Role().Save(runMemberRole); err != nil {
					multiErr = multierror.Append(multiErr, fmt.Errorf("failed to create new playbook %q role for existing custom scheme: %w", model.RunMemberRoleId, err))
				} else {
					scheme.DefaultRunMemberRole = savedRole.Name
				}
			}
			_, err := s.Store().Scheme().Save(scheme)
			if err != nil {
				multiErr = multierror.Append(multiErr, fmt.Errorf("failed to update custom scheme: %w", err))
			}
		}
	}

	if multiErr != nil {
		return multiErr
	}

	system := model.System{
		Name:  PlaybookRolesCreationMigrationKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark playbook roles creation migration as completed: %w", err)
	}

	return nil
}

func (s *Server) doFirstAdminSetupCompleteMigration() error {
	// arbitrary choice, though if there is an longstanding installation with less than 10 messages,
	// putting the first admin through onboarding shouldn't be very disruptive.
	const existingInstallationPostsThreshold = 10

	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(FirstAdminSetupCompleteKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	teams, err := s.Store().Team().GetAll()
	if err != nil {
		// can not confirm that admin has started in this case.
		return fmt.Errorf("could not get teams: %w", err)
	}

	if len(teams) == 0 {
		// No teams, and no existing preference. This is most likely a new instance.
		// So do not mark that the admin has already done the first time setup.
		return nil
	}

	// if there are teams, then if this isn't a new installation, there should be posts
	postCount, err := s.Store().Post().AnalyticsPostCount(&model.PostCountOptions{})
	if err != nil {
		return fmt.Errorf("could not get posts count from the database: %w", err)
	} else if postCount < existingInstallationPostsThreshold {
		mlog.Info("Post count is lower than expected, aborting migration",
			mlog.Int("expected", int(existingInstallationPostsThreshold)),
			mlog.Int("actual", int(postCount)))
		return nil
	}

	system := model.System{
		Name:  FirstAdminSetupCompleteKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark first admin setup migration as completed: %w", err)
	}

	return nil
}

func (s *Server) doRemainingSchemaMigrations() error {
	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(remainingSchemaMigrationsKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	if teams, err := s.Store().Team().GetByEmptyInviteID(); err != nil {
		mlog.Error("Error fetching Teams without InviteID", mlog.Err(err))
	} else {
		for _, team := range teams {
			team.InviteId = model.NewId()
			if _, err := s.Store().Team().Update(team); err != nil {
				return fmt.Errorf("error updating Team InviteIDs %q: %w", team.Id, err)
			}
		}
	}

	system := model.System{
		Name:  remainingSchemaMigrationsKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark the remaining schema migrations as completed: %w", err)
	}

	return nil
}

func (s *Server) doPostPriorityConfigDefaultTrueMigration() error {
	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(postPriorityConfigDefaultTrueMigrationKey); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	s.platform.UpdateConfig(func(config *model.Config) {
		config.ServiceSettings.PostPriority = new(true)
	})

	system := model.System{
		Name:  postPriorityConfigDefaultTrueMigrationKey,
		Value: "true",
	}

	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark post priority config migration as completed: %w", err)
	}

	return nil
}

func (s *Server) doSetupContentFlaggingProperties() error {
	// This migration is designed in a way to allow adding more properties in the future.
	// When a new property needs to be added, add it to the expectedPropertiesMap map and
	// update the contentFlaggingMigrationVersion to a new value.

	// If the migration is already marked as completed, don't do it again.
	var nfErr *store.ErrNotFound
	data, err := s.Store().System().GetByName(contentFlaggingSetupDoneKey)
	if err != nil && !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	if data != nil && data.Value == contentFlaggingMigrationVersion {
		return nil
	}

	// RegisterPropertyGroup is idempotent, so no need to check if group is already registered
	group, err := s.propertyService.RegisterPropertyGroup(&model.PropertyGroup{Name: model.ContentFlaggingGroupName, Version: model.PropertyGroupVersionV1})
	if err != nil {
		return fmt.Errorf("failed to register Content Flagging group: %w", err)
	}

	// Using page size of 100 and not iterating through all pages because the
	// number of fields are static and defined here and not expected to be more than 100 for now.
	existingProperties, err := s.propertyService.SearchPropertyFields(nil, group.ID, model.PropertyFieldSearchOpts{PerPage: 100})
	if err != nil {
		return fmt.Errorf("failed to search for existing content flagging properties: %w", err)
	}

	existingPropertiesMap := map[string]*model.PropertyField{}
	for _, property := range existingProperties {
		existingPropertiesMap[property.Name] = property
	}

	expectedPropertiesMap := map[string]*model.PropertyField{
		contentFlaggingPropertyNameFlaggedPostId: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyNameFlaggedPostId,
			Type:    model.PropertyFieldTypeText,
		},
		ContentFlaggingPropertyNameStatus: {
			GroupID: group.ID,
			Name:    ContentFlaggingPropertyNameStatus,
			Type:    model.PropertyFieldTypeSelect,
			Attrs: map[string]any{
				"options": []map[string]string{
					{"name": model.ContentFlaggingStatusPending, "color": "light_grey"},
					{"name": model.ContentFlaggingStatusAssigned, "color": "dark_blue"},
					{"name": model.ContentFlaggingStatusRemoved, "color": "dark_red"},
					{"name": model.ContentFlaggingStatusRetained, "color": "light_blue"},
				},
			},
		},
		contentFlaggingPropertyNameReportingUserID: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyNameReportingUserID,
			Type:    model.PropertyFieldTypeUser,
		},
		contentFlaggingPropertyNameReportingReason: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyNameReportingReason,
			Type:    model.PropertyFieldTypeSelect,
		},
		contentFlaggingPropertyNameReportingComment: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyNameReportingComment,
			Type:    model.PropertyFieldTypeText,
		},
		contentFlaggingPropertyNameReportingTime: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyNameReportingTime,
			Type:    model.PropertyFieldTypeText,
			Attrs:   map[string]any{"subType": contentFlaggingPropertySubTypeTimestamp},
		},
		contentFlaggingPropertyNameReviewerUserID: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyNameReviewerUserID,
			Type:    model.PropertyFieldTypeUser,
			Attrs:   map[string]any{"editable": true},
		},
		contentFlaggingPropertyNameActorUserID: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyNameActorUserID,
			Type:    model.PropertyFieldTypeUser,
		},
		contentFlaggingPropertyNameActorComment: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyNameActorComment,
			Type:    model.PropertyFieldTypeText,
		},
		contentFlaggingPropertyNameActionTime: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyNameActionTime,
			Type:    model.PropertyFieldTypeText,
			Attrs:   map[string]any{"subType": contentFlaggingPropertySubTypeTimestamp},
		},
		contentFlaggingPropertyManageByContentFlagging: {
			GroupID: group.ID,
			Name:    contentFlaggingPropertyManageByContentFlagging,
			Type:    model.PropertyFieldTypeText,
		},
	}

	var propertiesToUpdate []*model.PropertyField
	var propertiesToCreate []*model.PropertyField

	for name, expectedProperty := range expectedPropertiesMap {
		if _, exists := existingPropertiesMap[name]; exists {
			property := existingPropertiesMap[name]
			property.Type = expectedProperty.Type
			property.Attrs = expectedProperty.Attrs
			propertiesToUpdate = append(propertiesToUpdate, property)
		} else {
			propertiesToCreate = append(propertiesToCreate, expectedProperty)
		}
	}

	for _, property := range propertiesToCreate {
		if _, err := s.propertyService.CreatePropertyField(nil, property); err != nil {
			// Another server may have won the race and created this field
			// concurrently (e.g. parallel tests sharing a database pool).
			// Tolerate that but propagate any other error.
			if _, retryErr := s.propertyService.GetPropertyFieldByName(nil, group.ID, "", property.Name); retryErr != nil {
				return fmt.Errorf("failed to create content flagging property: %q, error: %w", property.Name, err)
			}
		}
	}

	if len(propertiesToUpdate) > 0 {
		if _, _, _, err := s.propertyService.UpdatePropertyFields(nil, group.ID, propertiesToUpdate); err != nil {
			// Another server may have won the race and updated these fields
			// concurrently (e.g. parallel tests sharing a database pool).
			// Both servers write the same expected values, so tolerate the
			// conflict but propagate any other error.
			var conflictErr *store.ErrConflict
			if !errors.As(err, &conflictErr) {
				return fmt.Errorf("failed to update content flagging property fields: %w", err)
			}
		}
	}

	if err := s.Store().System().SaveOrUpdate(&model.System{Name: contentFlaggingSetupDoneKey, Value: contentFlaggingMigrationVersion}); err != nil {
		return fmt.Errorf("failed to save content flagging setup done flag in system store %w", err)
	}

	return nil
}

func (s *Server) doSetupBoardsProperties() error {
	var nfErr *store.ErrNotFound
	data, err := s.Store().System().GetByName(boardsPropertySetupDoneKey)
	if err != nil && !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query boards migration: %w", err)
	}

	if data != nil && data.Value == boardsPropertyMigrationVersion {
		return nil
	}

	group, err := s.propertyService.RegisterPropertyGroup(&model.PropertyGroup{Name: model.BoardsPropertyGroupName, Version: model.PropertyGroupVersionV2})
	if err != nil {
		return fmt.Errorf("failed to register boards property group: %w", err)
	}

	existingProperties, err := s.propertyService.SearchPropertyFields(nil, group.ID, model.PropertyFieldSearchOpts{PerPage: 100})
	if err != nil {
		return fmt.Errorf("failed to search for existing boards properties: %w", err)
	}

	existingPropertiesMap := map[string]*model.PropertyField{}
	for _, property := range existingProperties {
		existingPropertiesMap[property.Name] = property
	}

	expectedPropertiesMap := map[string]*model.PropertyField{
		model.BoardsPropertyFieldAssignee: {
			GroupID:         group.ID,
			Name:            model.BoardsPropertyFieldAssignee,
			Type:            model.PropertyFieldTypeUser,
			ObjectType:      model.PropertyFieldObjectTypePost,
			TargetType:      string(model.PropertyFieldTargetLevelSystem),
			Protected:       true,
			PermissionField: model.NewPointer(model.PermissionLevelNone),
		},
		model.BoardsPropertyFieldStatus: {
			GroupID:         group.ID,
			Name:            model.BoardsPropertyFieldStatus,
			Type:            model.PropertyFieldTypeSelect,
			ObjectType:      model.PropertyFieldObjectTypePost,
			TargetType:      string(model.PropertyFieldTargetLevelSystem),
			Protected:       true,
			PermissionField: model.NewPointer(model.PermissionLevelNone),
			Attrs: map[string]any{
				"options": []map[string]string{
					{"name": model.BoardsStatusOptionTodo},
					{"name": model.BoardsStatusOptionInProgress},
					{"name": model.BoardsStatusOptionComplete},
				},
			},
		},
	}

	var propertiesToUpdate []*model.PropertyField
	var propertiesToCreate []*model.PropertyField

	for name, expectedProperty := range expectedPropertiesMap {
		if _, exists := existingPropertiesMap[name]; exists {
			property := existingPropertiesMap[name]
			property.Type = expectedProperty.Type
			property.Attrs = expectedProperty.Attrs
			property.Protected = expectedProperty.Protected
			property.PermissionField = expectedProperty.PermissionField
			propertiesToUpdate = append(propertiesToUpdate, property)
		} else {
			propertiesToCreate = append(propertiesToCreate, expectedProperty)
		}
	}

	for _, property := range propertiesToCreate {
		if _, err := s.propertyService.CreatePropertyField(nil, property); err != nil {
			// Another server may have won the race and created this field
			// concurrently (e.g. parallel tests sharing a database pool).
			// Tolerate that but propagate any other error.
			if _, retryErr := s.propertyService.GetPropertyFieldByName(nil, group.ID, "", property.Name); retryErr != nil {
				return fmt.Errorf("failed to create boards property: %q, error: %w", property.Name, err)
			}
		}
	}

	if len(propertiesToUpdate) > 0 {
		if _, _, _, err := s.propertyService.UpdatePropertyFields(nil, group.ID, propertiesToUpdate); err != nil {
			// Another server may have won the race and updated these fields
			// concurrently (e.g. parallel tests sharing a database pool).
			// Both servers write the same expected values, so tolerate the
			// conflict but propagate any other error.
			var conflictErr *store.ErrConflict
			if !errors.As(err, &conflictErr) {
				return fmt.Errorf("failed to update boards property fields: %w", err)
			}
		}
	}

	if err := s.Store().System().SaveOrUpdate(&model.System{Name: boardsPropertySetupDoneKey, Value: boardsPropertyMigrationVersion}); err != nil {
		return fmt.Errorf("failed to save boards setup done flag in system store %w", err)
	}

	return nil
}

func (s *Server) doSetupManagedCategoryProperties() error {
	var nfErr *store.ErrNotFound
	data, err := s.Store().System().GetByName(managedCategorySetupDoneKey)
	if err != nil && !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	if data != nil {
		if data.Value == managedCategoryMigrationVersion {
			return s.cacheManagedCategoryIDs()
		}

		if incrementErr := s.Store().PropertyGroup().IncrementVersion(model.ManagedCategoryPropertyGroupName); incrementErr != nil {
			return fmt.Errorf("failed to increment managed category group version: %w", incrementErr)
		}

		if saveErr := s.Store().System().SaveOrUpdate(&model.System{Name: managedCategorySetupDoneKey, Value: managedCategoryMigrationVersion}); saveErr != nil {
			return fmt.Errorf("failed to save managed category setup done flag: %w", saveErr)
		}

		return s.cacheManagedCategoryIDs()
	}

	group, err := s.propertyService.RegisterPropertyGroup(&model.PropertyGroup{Name: model.ManagedCategoryPropertyGroupName, Version: model.PropertyGroupVersionV2})
	if err != nil {
		return fmt.Errorf("failed to register managed category group: %w", err)
	}

	_, err = s.propertyService.GetPropertyFieldByName(nil, group.ID, "", model.ManagedCategoryPropertyFieldName)
	if err != nil {
		field := &model.PropertyField{
			GroupID:           group.ID,
			Name:              model.ManagedCategoryPropertyFieldName,
			Type:              model.PropertyFieldTypeText,
			ObjectType:        model.PropertyValueTargetTypeChannel,
			TargetType:        "system",
			TargetID:          "",
			Protected:         true,
			PermissionField:   model.NewPointer(model.PermissionLevelNone),
			PermissionValues:  model.NewPointer(model.PermissionLevelMember),
			PermissionOptions: model.NewPointer(model.PermissionLevelMember),
		}

		if _, err := s.propertyService.CreatePropertyField(nil, field); err != nil {
			if _, retryErr := s.propertyService.GetPropertyFieldByName(nil, group.ID, "", model.ManagedCategoryPropertyFieldName); retryErr != nil {
				return fmt.Errorf("failed to create managed category field: %w", err)
			}
		}
	}

	if err := s.Store().System().SaveOrUpdate(&model.System{Name: managedCategorySetupDoneKey, Value: "true"}); err != nil {
		return fmt.Errorf("failed to save managed category setup done flag: %w", err)
	}

	return s.cacheManagedCategoryIDs()
}

func (s *Server) doSetupCPADisplayNameBackfill(rctx request.CTX) error {
	var nfErr *store.ErrNotFound
	data, err := s.Store().System().GetByName(cpaDisplayNameBackfillKey)
	if err != nil && !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query CPA display_name backfill migration: %w", err)
	}

	if data != nil {
		return nil
	}

	// The properties package owns the actual field iteration and update logic.
	// It deliberately bypasses the access-control layer for this single,
	// well-defined backfill so it can update protected (e.g. UAS-managed) CPA
	// fields whose source plugin is not the system. Keeping the bypass behind
	// an explicitly named method on PropertyService avoids exposing a general
	// "skip access control" surface from this package.
	backfilled, skipped, err := s.propertyService.MigrateBackfillCPADisplayName(rctx)
	if err != nil {
		return fmt.Errorf("failed to backfill CPA display_name: %w", err)
	}

	mlog.Info("CPA display_name backfill migration completed",
		mlog.Int("backfilled", backfilled),
		mlog.Int("skipped", skipped),
	)

	if err := s.Store().System().SaveOrUpdate(&model.System{
		Name:  cpaDisplayNameBackfillKey,
		Value: "true",
	}); err != nil {
		return fmt.Errorf("failed to mark CPA display_name backfill as complete: %w", err)
	}

	return nil
}

func (s *Server) cacheManagedCategoryIDs() error {
	group, err := s.propertyService.GetPropertyGroup(model.ManagedCategoryPropertyGroupName)
	if err != nil {
		return fmt.Errorf("failed to get managed category group: %w", err)
	}

	field, err := s.propertyService.GetPropertyFieldByName(nil, group.ID, "", model.ManagedCategoryPropertyFieldName)
	if err != nil {
		return fmt.Errorf("failed to get managed category field: %w", err)
	}

	s.Channels().managedCategoryGroupID = group.ID
	s.Channels().managedCategoryFieldID = field.ID

	return nil
}

func (s *Server) doCloudS3PathMigrations(rctx request.CTX) error {
	// This migration is only applicable for cloud environments
	if os.Getenv("MM_CLOUD_FILESTORE_BIFROST") == "" {
		return nil
	}

	// If the migration is already marked as completed, don't do it again.
	if _, err := s.Store().System().GetByName(model.MigrationKeyS3Path); err == nil {
		return nil
	}

	// If there is a job already pending, no need to schedule again.
	// This is possible if the pod was rolled over.
	jobs, err := s.Store().Job().GetAllByTypeAndStatus(rctx, model.JobTypeS3PathMigration, model.JobStatusPending)
	if err != nil {
		return fmt.Errorf("failed to get jobs by type and status: %w", err)
	}
	if len(jobs) > 0 {
		return nil
	}

	if _, appErr := s.Jobs.CreateJobOnce(rctx, model.JobTypeS3PathMigration, nil); appErr != nil {
		return fmt.Errorf("failed to start job for migrating s3 file paths: %w", appErr)
	}

	return nil
}

func (s *Server) doDeleteEmptyDraftsMigration(rctx request.CTX) error {
	// If the migration is already marked as completed, don't do it again.
	if _, err := s.Store().System().GetByName(model.MigrationKeyDeleteEmptyDrafts); err == nil {
		return nil
	}

	jobs, err := s.Store().Job().GetAllByTypeAndStatus(rctx, model.JobTypeDeleteEmptyDraftsMigration, model.JobStatusPending)
	if err != nil {
		return fmt.Errorf("failed to get jobs by type and status: %w", err)
	}
	if len(jobs) > 0 {
		return nil
	}

	if _, appErr := s.Jobs.CreateJobOnce(rctx, model.JobTypeDeleteEmptyDraftsMigration, nil); appErr != nil {
		return fmt.Errorf("failed to start job for deleting empty drafts: %w", appErr)
	}

	return nil
}

func (s *Server) doDeleteOrphanDraftsMigration(rctx request.CTX) error {
	// If the migration is already marked as completed, don't do it again.
	if _, err := s.Store().System().GetByName(model.MigrationKeyDeleteOrphanDrafts); err == nil {
		return nil
	}

	jobs, err := s.Store().Job().GetAllByTypeAndStatus(rctx, model.JobTypeDeleteOrphanDraftsMigration, model.JobStatusPending)
	if err != nil {
		return fmt.Errorf("failed to get jobs by type and status: %w", err)
	}
	if len(jobs) > 0 {
		return nil
	}

	if _, appErr := s.Jobs.CreateJobOnce(rctx, model.JobTypeDeleteOrphanDraftsMigration, nil); appErr != nil {
		return fmt.Errorf("failed to start job for deleting orphan drafts: %w", appErr)
	}

	return nil
}

func (s *Server) doDeleteDmsPreferencesMigration(rctx request.CTX) error {
	// If the migration is already marked as completed, don't do it again.
	if _, err := s.Store().System().GetByName(model.MigrationKeyDeleteDmsPreferences); err == nil {
		return nil
	}

	jobs, err := s.Store().Job().GetAllByTypeAndStatus(rctx, model.JobTypeDeleteDmsPreferencesMigration, model.JobStatusPending)
	if err != nil {
		return fmt.Errorf("failed to get jobs by type and status: %w", err)
	}
	if len(jobs) > 0 {
		return nil
	}

	if _, appErr := s.Jobs.CreateJobOnce(rctx, model.JobTypeDeleteDmsPreferencesMigration, nil); appErr != nil {
		return fmt.Errorf("failed to start job for deleting dm preferences: %w", appErr)
	}

	return nil
}

func (s *Server) doAccessControlPolicyV0_3Migration(rctx request.CTX) error {
	var nfErr *store.ErrNotFound
	if _, err := s.Store().System().GetByName(model.MigrationKeyAccessControlPolicyV0_3); err == nil {
		return nil
	} else if !errors.As(err, &nfErr) {
		return fmt.Errorf("could not query migration: %w", err)
	}

	policyTypes := []string{model.AccessControlPolicyTypeParent, model.AccessControlPolicyTypeChannel}

	const pageSize = 100
	for _, policyType := range policyTypes {
		cursor := model.AccessControlPolicyCursor{}
		policies, err := utils.Pager(func(_ int) ([]*model.AccessControlPolicy, error) {
			results, _, err := s.Store().AccessControlPolicy().SearchPolicies(rctx, model.AccessControlPolicySearch{
				Type:   policyType,
				Cursor: cursor,
				Limit:  pageSize,
			})
			if err != nil {
				return nil, err
			}
			if len(results) > 0 {
				cursor = model.AccessControlPolicyCursor{ID: results[len(results)-1].ID}
			}
			return results, nil
		}, pageSize)
		if err != nil {
			return fmt.Errorf("failed to search access control policies: %w", err)
		}

		for _, policy := range policies {
			if policy.Version != model.AccessControlPolicyVersionV0_2 {
				continue
			}

			policy.Version = model.AccessControlPolicyVersionV0_3
			for i, rule := range policy.Rules {
				for j, action := range rule.Actions {
					if action == "*" {
						policy.Rules[i].Actions[j] = model.AccessControlPolicyActionMembership
					}
				}
			}

			if _, err := s.Store().AccessControlPolicy().Save(rctx, policy); err != nil {
				return fmt.Errorf("failed to save migrated access control policy id=%s: %w", policy.ID, err)
			}

			if policy.Type == model.AccessControlPolicyTypeChannel {
				s.Store().Channel().InvalidateChannel(policy.ID)
			}
		}
	}

	system := model.System{
		Name:  model.MigrationKeyAccessControlPolicyV0_3,
		Value: "true",
	}

	// SaveOrUpdate is idempotent — another server racing us to run the
	// same migration (e.g. parallel tests sharing a database pool) would
	// otherwise trigger a unique-constraint violation on systems_pkey and
	// mlog.Fatal the process.
	if err := s.Store().System().SaveOrUpdate(&system); err != nil {
		return fmt.Errorf("failed to mark access control policy v0.3 migration as completed: %w", err)
	}

	return nil
}

func (a *App) DoAppMigrations() {
	a.Srv().doAppMigrations()
}

func (s *Server) doAppMigrations() {
	type migration struct {
		name    string
		handler func() error
	}
	m1 := []migration{
		{"Advanced Permissions Migration", s.doAdvancedPermissionsMigration},
		{"Emojis Permissions Migration", s.doEmojisPermissionsMigration},
		{"GuestRolesCreationMigration", s.doGuestRolesCreationMigration},
		{"System Console Roles Creation Migration", s.doSystemConsoleRolesCreationMigration},
		{"Custom Group Admin Role Creation Migration", s.doCustomGroupAdminRoleCreationMigration},
		{"Shared Channel Manager Role Creation Migration", s.doSharedChannelManagerRoleCreationMigration},
		// This migration always run after dependent migrations such as the guest roles migration.
		{"Permissions Migrations", s.doPermissionsMigrations},
		{"Content Extraction Config Default True Migration", s.doContentExtractionConfigDefaultTrueMigration},
		{"Playbooks Roles Creation Migration", s.doPlaybooksRolesCreationMigration},
		{"First Admin Setup Complete Migration", s.doFirstAdminSetupCompleteMigration},
		{"Remaining Schema Migrations", s.doRemainingSchemaMigrations},
		{"Post Priority Config Default True Migration", s.doPostPriorityConfigDefaultTrueMigration},
		{"Content Flagging Properties Setup", s.doSetupContentFlaggingProperties},
		{"Boards Properties Setup", s.doSetupBoardsProperties},
		{"Managed Category Properties Setup", s.doSetupManagedCategoryProperties},
	}

	for i := range m1 {
		err := m1[i].handler()
		if err != nil {
			mlog.Fatal("Failed to run app migration",
				mlog.String("migration", m1[i].name),
				mlog.Err(err),
			)
		}
	}

	type migrationContext struct {
		name    string
		handler func(request.CTX) error
	}
	m2 := []migrationContext{
		{"Encode S3 Image Paths Migration", s.doCloudS3PathMigrations},
		{"Delete Empty Drafts Migration", s.doDeleteEmptyDraftsMigration},
		{"Delete Orphan Drafts Migration", s.doDeleteOrphanDraftsMigration},
		{"Delete Invalid Dms Preferences Migration", s.doDeleteDmsPreferencesMigration},
		{"Access Control Policy V0.3 Migration", s.doAccessControlPolicyV0_3Migration},
		{"CPA DisplayName Backfill", s.doSetupCPADisplayNameBackfill},
	}

	rctx := request.EmptyContext(s.Log())
	for i := range m2 {
		err := m2[i].handler(rctx)
		if err != nil {
			mlog.Fatal("Failed to run app migration",
				mlog.String("migration", m2[i].name),
				mlog.Err(err),
			)
		}
	}
}