core-old/internal/bundb/player_snapshot.go

package bundb

import (
	"context"
	"database/sql"
	"errors"
	"fmt"
	"time"

	"gitea.dwysokinski.me/twhelp/core/internal/bundb/internal/model"
	"gitea.dwysokinski.me/twhelp/core/internal/domain"
	"github.com/uptrace/bun"
)

var (
	playerSnapshotOrders = []string{"ps.server_key ASC"}
)

type PlayerSnapshot struct {
	db *bun.DB
}

func NewPlayerSnapshot(db *bun.DB) *PlayerSnapshot {
	return &PlayerSnapshot{db: db}
}

func (p *PlayerSnapshot) Create(ctx context.Context, params ...domain.CreatePlayerSnapshotParams) error {
	if len(params) == 0 {
		return nil
	}

	snapshots := make([]model.PlayerSnapshot, 0, len(params))
	for _, param := range params {
		snapshots = append(snapshots, model.NewPlayerSnapshot(param))
	}

	if _, err := p.db.NewInsert().
		Model(&snapshots).
		Returning("NULL").
		Exec(ctx); err != nil {
		return fmt.Errorf("something went wrong while inserting player snapshots into the db: %w", err)
	}

	return nil
}

func (p *PlayerSnapshot) List(ctx context.Context, params domain.ListPlayerSnapshotsParams) ([]domain.PlayerSnapshot, error) {
	var snapshots []model.PlayerSnapshot

	if err := p.db.NewSelect().
		Model(&snapshots).
		Order(playerSnapshotOrders...).
		Apply(listPlayerSnapshotsParamsApplier{params}.apply).
		Scan(ctx); err != nil && !errors.Is(err, sql.ErrNoRows) {
		return nil, fmt.Errorf("couldn't select player snapshots from the db: %w", err)
	}

	result := make([]domain.PlayerSnapshot, 0, len(snapshots))
	for _, snapshot := range snapshots {
		result = append(result, snapshot.ToDomain())
	}

	return result, nil
}

func (p *PlayerSnapshot) ListCountWithRelations(
	ctx context.Context,
	params domain.ListPlayerSnapshotsParams,
) ([]domain.PlayerSnapshotWithRelations, int64, error) {
	var snapshots []model.PlayerSnapshot

	paramsApplier := listPlayerSnapshotsParamsApplier{params}

	subQ := p.db.NewSelect().
		Column("id").
		Model(&model.PlayerSnapshot{}).
		Order(playerSnapshotOrders...).
		Apply(paramsApplier.apply)

	cntQ := p.db.NewSelect().
		Model(&model.PlayerSnapshot{}).
		Apply(paramsApplier.applyFilters)

	q := p.db.NewSelect().
		Model(&snapshots).
		Order(playerSnapshotOrders...).
		Apply(paramsApplier.applySort).
		Where("ps.id IN (?)", subQ).
		Relation("Tribe", func(q *bun.SelectQuery) *bun.SelectQuery {
			return q.Column(tribeMetaColumns...)
		})

	count, err := scanAndCount(ctx, cntQ, q)
	if err != nil && !errors.Is(err, sql.ErrNoRows) {
		return nil, 0, fmt.Errorf("couldn't select player snapshots from the db: %w", err)
	}

	result := make([]domain.PlayerSnapshotWithRelations, 0, len(snapshots))
	for _, snapshot := range snapshots {
		result = append(result, snapshot.ToDomainWithRelations())
	}

	return result, int64(count), nil
}

func (p *PlayerSnapshot) Delete(ctx context.Context, serverKey string, createdAtLTE time.Time) error {
	if _, err := p.db.NewDelete().
		Model(&model.PlayerSnapshot{}).
		Where("server_key = ?", serverKey).
		Where("created_at <= ?", createdAtLTE).
		Returning("NULL").
		Exec(ctx); err != nil {
		return fmt.Errorf("couldn't delete player snapshots: %w", err)
	}

	return nil
}

type listPlayerSnapshotsParamsApplier struct {
	params domain.ListPlayerSnapshotsParams
}

func (l listPlayerSnapshotsParamsApplier) apply(q *bun.SelectQuery) *bun.SelectQuery {
	return q.Apply(l.applySort).Apply(l.applyFilters).Apply(l.applyPagination)
}

func (l listPlayerSnapshotsParamsApplier) applyFilters(q *bun.SelectQuery) *bun.SelectQuery {
	if len(l.params.ServerKeys) > 0 {
		q = q.Where("ps.server_key IN (?)", bun.In(l.params.ServerKeys))
	}

	if len(l.params.PlayerIDs) > 0 {
		q = q.Where("ps.player_id IN (?)", bun.In(l.params.PlayerIDs))
	}

	return q
}

func (l listPlayerSnapshotsParamsApplier) applySort(q *bun.SelectQuery) *bun.SelectQuery {
	if len(l.params.Sort) == 0 {
		return q
	}

	orders := make([]string, 0, len(l.params.Sort))
	for i, s := range l.params.Sort {
		column, err := playerSnapshotSortByToColumn(s.By)
		if err != nil {
			return q.Err(fmt.Errorf("playerSnapshotSortByToColumn (index=%d): %w", i, err))
		}

		direction, err := sortDirectionToString(s.Direction)
		if err != nil {
			return q.Err(fmt.Errorf("sortDirectionToString (index=%d): %w", i, err))
		}

		orders = append(orders, column+" "+direction)
	}

	return q.Order(orders...)
}

func (l listPlayerSnapshotsParamsApplier) applyPagination(q *bun.SelectQuery) *bun.SelectQuery {
	return (paginationApplier{pagination: l.params.Pagination}).apply(q)
}

func playerSnapshotSortByToColumn(sortBy domain.PlayerSnapshotSortBy) (string, error) {
	switch sortBy {
	case domain.PlayerSnapshotSortByID:
		return "ps.id", nil
	case domain.PlayerSnapshotSortByDate:
		return "ps.date", nil
	}
	return "", fmt.Errorf("%w: %d", domain.ErrUnsupportedSortBy, sortBy)
}