package ops_execution_window

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, window *maintent.OpsExecutionWindow) (*maintent.OpsExecutionWindow, error)
	Load(ctx context.Context, id uint64) (*maintent.OpsExecutionWindow, error)
	Query(ctx context.Context, opts ...repoopt.Option) ([]*maintent.OpsExecutionWindow, error)
	Count(ctx context.Context, opts ...repoopt.Option) (int64, error)
	Delete(ctx context.Context, id uint64) error
}

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

func (d *driver) Save(
	ctx context.Context,
	window *maintent.OpsExecutionWindow,
) (*maintent.OpsExecutionWindow, error) {
	wdb := d.dbProvider.WriteDB(ctx)
	windowMod := d.cvter.EntityToModel().OpsExecutionWindow(window)

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

	return d.cvter.ModelToEntity().OpsExecutionWindow(windowMod), nil
}

func (d *driver) Load(
	ctx context.Context,
	id uint64,
) (*maintent.OpsExecutionWindow, error) {
	rdb := d.dbProvider.ReadDB(ctx)
	windowMod := &maintmod.OpsExecutionWindow{}
	err := buildOpsExecutionWindowModel(rdb).Where("id = ?", id).First(windowMod).Error
	if err != nil {
		return nil, fmt.Errorf("load ops execution window %d failed: %w", id, err)
	}

	return d.cvter.ModelToEntity().OpsExecutionWindow(windowMod), nil
}

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

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

	err := rdb.Find(&windowMods).Error
	if err != nil {
		return nil, fmt.Errorf("query ops execution windows failed: %w", err)
	}

	return container.TransformSlice(windowMods, d.cvter.ModelToEntity().OpsExecutionWindow), nil
}

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

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

	return count, nil
}

func (d *driver) Delete(ctx context.Context, id uint64) error {
	wdb := d.dbProvider.WriteDB(ctx)
	result := buildOpsExecutionWindowModel(wdb).Where("id = ?", id).Delete(&maintmod.OpsExecutionWindow{})
	if result.Error != nil {
		return fmt.Errorf("delete ops execution window %d failed: %w", id, result.Error)
	}
	return nil
}

func buildOpsExecutionWindowModel(db *gorm.DB) *gorm.DB {
	return db.Model(&maintmod.OpsExecutionWindow{})
}