package maintenance

import (
	"context"
	"fmt"

	maintent "github.com/tidbcloud/devops/entity/maintenance"

	maintmod "github.com/tidbcloud/devops/models/maintenance"
	"github.com/tidbcloud/devops/pkg/infra/utils/container"
	"github.com/tidbcloud/devops/pkg/infra/utils/repoopt"
	"github.com/tidbcloud/devops/pkg/service/clustermaintenance/repo/cvt"
	"gorm.io/gorm"

	"github.com/tidbcloud/pkgv2/db"
)

type Driver interface {
	Save(ctx context.Context, mnt *maintent.ClusterMaintenanceInRepo) (*maintent.ClusterMaintenanceInRepo, error)
	Load(ctx context.Context, id uint64) (*maintent.ClusterMaintenanceInRepo, error)
	Query(ctx context.Context, opts ...repoopt.Option) ([]*maintent.ClusterMaintenanceInRepo, error)
	Count(ctx context.Context, opts ...repoopt.Option) (int64, error)
}

type driver struct {
	cvter      *cvt.Converter
	dbProvider db.Provider
}

func (d *driver) Save(ctx context.Context, mnt *maintent.ClusterMaintenanceInRepo) (*maintent.ClusterMaintenanceInRepo, error) {
	wdb := d.dbProvider.WriteDB(ctx)
	mntMod := d.cvter.EntityToModel().ClusterMaintenance(mnt)

	err := wdb.Session(&gorm.Session{FullSaveAssociations: true}).Save(mntMod).Error
	if err != nil {
		return nil, fmt.Errorf("save maintenance task failed: %w", err)
	}

	return d.cvter.ModelToEntity().ClusterMaintenance(mntMod), nil
}

func (d *driver) Load(ctx context.Context, id uint64) (*maintent.ClusterMaintenanceInRepo, error) {
	rdb := d.dbProvider.ReadDB(ctx)
	mntMod := &maintmod.ClusterMaintenance{}
	err := buildModel(rdb).Where("id = ?", id).First(mntMod).Error
	if err != nil {
		return nil, fmt.Errorf("load maintenance task %d failed: %w", id, err)
	}
	return d.cvter.ModelToEntity().ClusterMaintenance(mntMod), nil
}

func (d *driver) Query(ctx context.Context, opts ...repoopt.Option) ([]*maintent.ClusterMaintenanceInRepo, error) {
	rdb := d.dbProvider.ReadDB(ctx)
	mntMods := []*maintmod.ClusterMaintenance{}

	rdb = buildModel(rdb)

	rdb = repoopt.Aggregate(opts...).Apply(rdb)

	err := rdb.Find(&mntMods).Error
	if err != nil {
		return nil, fmt.Errorf("query maintenance tasks failed: %w", err)
	}

	return container.TransformSlice(mntMods, d.cvter.ModelToEntity().ClusterMaintenance), nil
}

func (d *driver) Count(ctx context.Context, opts ...repoopt.Option) (int64, error) {
	db := d.dbProvider.ReadDB(ctx).Model(&maintmod.ClusterMaintenance{})
	db = repoopt.Aggregate(opts...).Apply(db)

	var count int64
	err := db.Count(&count).Error
	if err != nil {
		return 0, fmt.Errorf("count maintenance tasks failed: %w", err)
	}

	return count, nil
}

func buildModel(db *gorm.DB) *gorm.DB {
	db = db.Model(&maintmod.ClusterMaintenance{})
	return db
}