package collectorset

import (
	"context"
	"errors"
	"log/slog"

	clientsyncrunner "queryorchestration/api/clientSyncRunner"
	"queryorchestration/internal/collector"
	"queryorchestration/internal/database"
	"queryorchestration/internal/database/repository"
	"queryorchestration/internal/serviceconfig/queue"
	"queryorchestration/internal/validation"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgtype"
)

type SetParams struct {
	ClientID        uuid.UUID
	ActiveVersion   *int32
	MinCleanVersion *int32
	MinTextVersion  *int32
	Fields          *map[string]uuid.UUID
}

func (s *Service) SetByClientId(ctx context.Context, params *SetParams) error {
	current, err := s.svc.Collector.GetByClientID(ctx, params.ClientID)
	if err != nil {
		return err
	}

	dbparams, err := s.getSetParams(ctx, current, params)
	if err != nil {
		return err
	}

	err = s.submitSet(ctx, current, dbparams)
	if err != nil {
		return err
	}

	err = s.informSet(ctx, dbparams)
	if err != nil {
		return err
	}

	return nil
}

func (s *Service) informSet(ctx context.Context, update *dbSetParams) error {
	if update.ActiveVersion == nil {
		return nil
	}

	return s.cfg.SendToQueue(ctx, &queue.SendParams{
		QueueURL: s.cfg.GetClientSyncURL(),
		Body: clientsyncrunner.Body{
			ID: database.MustToUUID(update.ClientID),
		},
	})
}

type dbSetParams struct {
	ClientID        pgtype.UUID
	ActiveVersion   *int32
	MinCleanVersion *int32
	MinTextVersion  *int32
	Fields          *map[string]pgtype.UUID
}

func (s *Service) getSetParams(ctx context.Context, current *collector.Collector, params *SetParams) (*dbSetParams, error) {
	err := s.normalizeCodeVersions(current, params)
	if err != nil {
		return nil, err
	}

	fields, err := s.normalizeSetFieldsToDB(ctx, current.Fields, params.Fields)
	if err != nil {
		return nil, err
	}

	err = s.normalizeActiveVersion(current, params)
	if err != nil {
		return nil, err
	}

	activeVersionName, err := validation.GetFieldName(params, params.ActiveVersion)
	if err != nil {
		return nil, err
	}
	fieldsName, err := validation.GetFieldName(params, params.Fields)
	if err != nil {
		return nil, err
	}

	if (params.ActiveVersion == nil || *params.ActiveVersion == current.LatestVersion+1) &&
		validation.AreAllPointersNilExcept(params, activeVersionName, fieldsName) &&
		fields == nil {
		return nil, errors.New("no changes")
	}

	return &dbSetParams{
		ClientID:        database.MustToDBUUID(params.ClientID),
		ActiveVersion:   params.ActiveVersion,
		MinCleanVersion: params.MinCleanVersion,
		MinTextVersion:  params.MinTextVersion,
		Fields:          fields,
	}, nil
}

func (s *Service) normalizeCodeVersions(current *collector.Collector, params *SetParams) error {
	if current == nil {
		return errors.New("current collector required")
	}

	if params == nil {
		return nil
	}

	if params.MinCleanVersion != nil && *params.MinCleanVersion == current.MinCleanVersion {
		params.MinCleanVersion = nil
	}

	if params.MinCleanVersion != nil {
		err := s.svc.CleanVersion.IsValidVersion(*params.MinCleanVersion)
		if err != nil {
			return err
		}
	}

	if params.MinTextVersion != nil && *params.MinTextVersion == current.MinTextVersion {
		params.MinTextVersion = nil
	}

	if params.MinTextVersion != nil {
		err := s.svc.TextVersion.IsValidVersion(*params.MinTextVersion)
		if err != nil {
			return err
		}
	}

	return nil
}

func (s *Service) normalizeActiveVersion(current *collector.Collector, params *SetParams) error {
	if current == nil {
		return errors.New("current collector required")
	}

	if params == nil || params.ActiveVersion == nil {
		return nil
	}

	err := validation.NormalizeInClosedInterval(&params.ActiveVersion, current.ActiveVersion, 1, current.LatestVersion+1)
	if err != nil {
		return err
	}

	return nil
}

func (s *Service) normalizeSetFieldsToDB(ctx context.Context, current map[string]uuid.UUID, ofields *map[string]uuid.UUID) (*map[string]pgtype.UUID, error) {
	if ofields == nil || *ofields == nil {
		return nil, nil
	} else if len(*ofields) == 0 {
		return nil, nil
	}

	dbm := map[string]pgtype.UUID{}
	for name, id := range *ofields {
		dbm[name] = database.MustToDBUUID(id)
	}

	removeIDs := getRemoveFields(current, &dbm)
	addIDs := getAddFields(current, &dbm)

	if len(addIDs) == 0 && len(removeIDs) == 0 {
		return nil, nil
	}

	return s.normalizeFieldsToDB(ctx, ofields)
}

func (s *Service) submitSet(ctx context.Context, current *collector.Collector, params *dbSetParams) error {
	err := s.cfg.ExecuteDBTransaction(ctx, func(ctx context.Context, qtx *repository.Queries) error {
		activeName, err := validation.GetFieldName(params, params.ActiveVersion)
		if err != nil {
			return err
		}
		onlyactive := validation.AreAllPointersNilExcept(params, activeName)

		var latestVersion int32
		if !onlyactive {
			latestVersion, err = qtx.AddLatestCollectorVersion(ctx, params.ClientID)
			if err != nil {
				return err
			}
		}

		if params.ActiveVersion != nil {
			err := qtx.SetActiveCollectorVersion(ctx, &repository.SetActiveCollectorVersionParams{
				Clientid:  params.ClientID,
				Versionid: *params.ActiveVersion,
			})
			if err != nil {
				return err
			}
		}

		if params.MinCleanVersion != nil {
			err = qtx.SetCollectorCleanVersion(ctx, &repository.SetCollectorCleanVersionParams{
				Clientid:     params.ClientID,
				Versionid:    *params.MinCleanVersion,
				Addedversion: latestVersion,
			})
			if err != nil {
				return err
			}
		}

		if params.MinTextVersion != nil {
			err = qtx.SetCollectorTextVersion(ctx, &repository.SetCollectorTextVersionParams{
				Clientid:     params.ClientID,
				Versionid:    *params.MinTextVersion,
				Addedversion: latestVersion,
			})
			if err != nil {
				return err
			}
		}

		if params.Fields != nil {
			removeIDs := getRemoveFields(current.Fields, params.Fields)
			for _, field := range removeIDs {
				err := qtx.RemoveCollectorQuery(ctx, &repository.RemoveCollectorQueryParams{
					Clientid:       params.ClientID,
					Queryid:        field,
					Removedversion: &latestVersion,
				})
				if err != nil {
					return err
				}
			}

			addIDs := getAddFields(current.Fields, params.Fields)
			for key, field := range addIDs {
				err := qtx.AddCollectorQuery(ctx, &repository.AddCollectorQueryParams{
					Clientid:     params.ClientID,
					Name:         key,
					Queryid:      field,
					Addedversion: latestVersion,
				})
				if err != nil {
					return err
				}
			}
		}

		slog.Debug("client collector updated", "update", *params)

		return nil
	})
	if err != nil {
		return err
	}

	return nil
}

func getRemoveFields(current map[string]uuid.UUID, update *map[string]pgtype.UUID) []pgtype.UUID {
	diff := []pgtype.UUID{}
	if update == nil {
		return diff
	}

	for ckey, cid := range current {
		found := false
		for ukey, uid := range *update {
			if cid == database.MustToUUID(uid) &&
				ckey == ukey {
				found = true
			}
		}
		if !found {
			diff = append(diff, database.MustToDBUUID(cid))
		}
	}

	return diff
}

func getAddFields(current map[string]uuid.UUID, update *map[string]pgtype.UUID) map[string]pgtype.UUID {
	diff := map[string]pgtype.UUID{}
	if update == nil {
		return diff
	}

	for ukey, uid := range *update {
		if current[ukey] != database.MustToUUID(uid) {
			diff[ukey] = uid
		}
	}

	return diff
}

func (s *Service) normalizeFieldsToDB(ctx context.Context, ofields *map[string]uuid.UUID) (*map[string]pgtype.UUID, error) {
	if ofields == nil || *ofields == nil {
		return nil, nil
	} else if len(*ofields) == 0 {
		return nil, nil
	}

	dbm := map[string]pgtype.UUID{}
	for name, id := range *ofields {
		dbm[name] = database.MustToDBUUID(id)
	}

	dbids := []pgtype.UUID{}
	for _, id := range dbm {
		dbids = append(dbids, id)
	}

	dedup := validation.DeduplicateArray(dbids)

	if len(dedup) != len(dbids) {
		return nil, errors.New("duplicate output fields")
	}

	exist, err := s.cfg.GetDBQueries().AllQueriesExist(ctx, dbids)
	if err != nil {
		return nil, err
	} else if !exist {
		return nil, errors.New("not all required ids are present")
	}

	return &dbm, nil
}