package repo

import (
	"context"
	"fmt"

	jmpent "github.com/tidbcloud/devops/entity/jump"
	"github.com/tidbcloud/devops/models/base"
	jmpmod "github.com/tidbcloud/devops/models/jump"
	"github.com/tidbcloud/devops/pkg/infra/utils/container"
	"github.com/tidbcloud/devops/pkg/infra/utils/repoopt"

	"gorm.io/gorm"
)

type AuthorizationDriver interface {
	Save(ctx context.Context, authorization *jmpent.Authorization) (*jmpent.Authorization, error)
	Load(ctx context.Context, id uint64) (*jmpent.Authorization, error)
	Query(ctx context.Context, opts ...repoopt.Option) ([]*jmpent.Authorization, error)
	Count(ctx context.Context, opts ...repoopt.Option) (int64, error)
}

type authorizationDriver driver

func (d *authorizationDriver) Save(ctx context.Context, auth *jmpent.Authorization) (*jmpent.Authorization, error) {
	wdb := d.dbProvider.WriteDB(ctx)
	authMod := d.cvter.EntityToModel().Authorization(auth)

	if auth.ID > 0 {
		// update association of jumps
		{
			existIDs := []base.ID{}
			for _, a := range authMod.Jumps {
				if a.ID != 0 {
					existIDs = append(existIDs, a.ID)
				}
			}
			db := wdb.Where("auth_id = ?", auth.ID)
			if len(existIDs) != 0 {
				db = db.Where("NOT id IN ?", existIDs)
			}
			err := db.Delete(&jmpmod.Jump{}).Error
			if err != nil {
				return nil, fmt.Errorf("delete jumps of auth %d failed: %w", auth.ID, err)
			}
		}
	}

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

	// fill back id
	return d.cvter.ModelToEntity().Authorization(authMod), nil
}

func (d *authorizationDriver) Load(ctx context.Context, id uint64) (*jmpent.Authorization, error) {
	rdb := d.dbProvider.ReadDB(ctx)
	authMod := &jmpmod.Authorization{}

	err := d.buildModel(rdb).Where("id = ?", id).First(authMod).Error
	if err != nil {
		return nil, fmt.Errorf("load authorization %d failed: %w", id, err)
	}

	return d.cvter.ModelToEntity().Authorization(authMod), nil
}

func (d *authorizationDriver) Query(ctx context.Context, opts ...repoopt.Option) ([]*jmpent.Authorization, error) {
	rdb := d.dbProvider.ReadDB(ctx)
	authMods := make([]*jmpmod.Authorization, 0)

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

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

	return container.TransformSlice(authMods, d.cvter.ModelToEntity().Authorization), nil
}

func (d *authorizationDriver) Count(ctx context.Context, opts ...repoopt.Option) (int64, error) {
	rdb := d.dbProvider.ReadDB(ctx).Model(&jmpmod.Authorization{})
	rdb = repoopt.Aggregate(opts...).Apply(rdb)

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

	return count, nil
}

func (d *authorizationDriver) buildModel(db *gorm.DB) *gorm.DB {
	db = db.Model(&jmpmod.Authorization{}).Preload("Jumps")

	return db
}