package queryqueue

import (
	"context"
	"queryorchestration/internal/database"
	queryprocessor "queryorchestration/internal/query/processor"
	"queryorchestration/internal/query/result"

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

func (q *Queue) Execute(ctx context.Context) error {
	if q.unsyncedQueue == nil {
		return nil
	}

	for _, query := range q.unsyncedQueue {
		err := q.executeQuery(ctx, query)
		if err != nil {
			return err
		}
	}

	q.unsyncedQueue = nil

	return nil
}

func (q *Queue) executeQuery(ctx context.Context, qu *queryprocessor.Query) error {
	values, err := q.getRequiredResults(ctx, qu.RequiredQueryIDs)
	if err != nil {
		return err
	}

	err = q.setResult(ctx, qu, values)
	if err != nil {
		return err
	}

	return nil
}

func (q *Queue) getRequiredResults(ctx context.Context, requiredQueryIDs *[]uuid.UUID) (*[]result.Value, error) {
	var values *[]result.Value
	if requiredQueryIDs != nil {
		resultIDs := make([]pgtype.UUID, len(*requiredQueryIDs))
		for index, id := range *requiredQueryIDs {
			var queryVersion int32
			for _, entry := range q.collectorQueries {
				if entry.ID == id {
					queryVersion = entry.Version
					break
				}
			}

			for _, entry := range q.results {
				if entry.QueryID == id && entry.QueryVersion == queryVersion {
					resultIDs[index] = database.MustToDBUUID(entry.ID)
					break
				}
			}
		}

		resultValues, err := q.db.Queries.ListResultValuesByID(ctx, resultIDs)
		if err != nil {
			return nil, err
		}

		rValues := make([]result.Value, len(resultValues))
		for index, r := range resultValues {
			cleanValue, err := q.getResultValue(r)
			if err != nil {
				return nil, err
			}

			rValues[index] = cleanValue
		}

		values = &rValues
	}

	return values, nil
}