package query

import (
	"context"
	"fmt"

	"queryorchestration/internal/database/repository"
	resultprocessor "queryorchestration/internal/query/result/processor"
	contextfull "queryorchestration/internal/query/types/contextFull"
	jsonextractor "queryorchestration/internal/query/types/jsonExtractor"

	"github.com/google/uuid"
)

func (s *Service) Create(ctx context.Context, entity *resultprocessor.Create) (uuid.UUID, error) {
	err := s.normalizeCreate(ctx, entity)
	if err != nil {
		return uuid.Nil, err
	}

	id, err := s.submitCreate(ctx, entity)
	if err != nil {
		return uuid.Nil, err
	}

	return id, err
}

func (s *Service) normalizeCreate(ctx context.Context, entity *resultprocessor.Create) error {
	err := s.NormalizeQueryIDs(ctx, entity)
	if err != nil {
		return err
	}

	err = s.NormalizeConfig(entity)
	if err != nil {
		return err
	}

	validator, err := s.getCreator(entity.Type)
	if err != nil {
		return err
	}

	err = validator.Validate(ctx, entity)
	if err != nil {
		return err
	}

	return nil
}

func (s *Service) submitCreate(ctx context.Context, entity *resultprocessor.Create) (uuid.UUID, error) {
	query, err := parseCreateQuery(entity)
	if err != nil {
		return uuid.Nil, err
	}

	var id uuid.UUID
	err = s.cfg.ExecuteDBTransaction(ctx, func(ctx context.Context, qtx *repository.Queries) error {
		id, err = qtx.CreateQuery(ctx, query.Type)
		if err != nil {
			return err
		}

		version, err := qtx.AddLatestQueryVersion(ctx, id)
		if err != nil {
			return err
		}

		err = qtx.AddActiveQueryVersion(ctx, &repository.AddActiveQueryVersionParams{
			Queryid:   id,
			Versionid: version,
		})
		if err != nil {
			return err
		}

		if query.RequiredQueryIDs != nil {
			for _, reqQuery := range *query.RequiredQueryIDs {
				err = qtx.AddRequiredQuery(ctx, &repository.AddRequiredQueryParams{
					Queryid:         id,
					Requiredqueryid: reqQuery,
					Addedversion:    version,
				})
				if err != nil {
					return err
				}
			}
		}

		if query.Config != nil {
			err = qtx.SetQueryConfig(ctx, &repository.SetQueryConfigParams{
				Queryid:      id,
				Config:       *query.Config,
				Addedversion: version,
			})
			if err != nil {
				return err
			}
		}

		return nil
	})
	if err != nil {
		return uuid.Nil, err
	}

	return id, nil

}

func (s *Service) getCreator(qType resultprocessor.Type) (resultprocessor.Creator, error) {
	switch qType {
	case resultprocessor.TypeJsonExtractor:
		return jsonextractor.NewCreator(), nil
	case resultprocessor.TypeContextFull:
		return contextfull.NewCreator(), nil
	default:
		return nil, fmt.Errorf("attempting to process invalid query type")
	}
}

type createQuery struct {
	Type             repository.Querytype
	RequiredQueryIDs *[]uuid.UUID
	Config           *[]byte
}

func parseCreateQuery(q *resultprocessor.Create) (*createQuery, error) {
	t, err := resultprocessor.ToDBQueryType(q.Type)
	if err != nil {
		return nil, err
	}

	var reqIDs *[]uuid.UUID
	if q.RequiredQueryIDs != nil {
		tIDs := *q.RequiredQueryIDs
		reqIDs = &tIDs
	}

	var cfg *[]byte
	if q.Config != nil {
		tC := []byte(*q.Config)
		cfg = &tC
	}

	return &createQuery{
		Type:             t,
		RequiredQueryIDs: reqIDs,
		Config:           cfg,
	}, nil
}