package repo

import (
	"context"
	"fmt"

	relent "github.com/tidbcloud/devops/entity/release"
	relmod "github.com/tidbcloud/devops/models/release"
	contutil "github.com/tidbcloud/devops/pkg/infra/utils/container"
	"github.com/tidbcloud/devops/pkg/infra/utils/repoopt"

	"gorm.io/gorm"
)

type ReleaseDriver interface {
	// Save create or update a Release
	Save(ctx context.Context, release *relent.ReleaseInRepo) (*relent.ReleaseInRepo, error)
	Load(ctx context.Context, id uint64) (*relent.ReleaseInRepo, error)
	Query(ctx context.Context, opts ...repoopt.Option) ([]*relent.ReleaseInRepo, error)
	Count(ctx context.Context, opts ...repoopt.Option) (int64, error)
}

type releaseDriver driver

func (r *releaseDriver) Save(ctx context.Context, release *relent.ReleaseInRepo) (*relent.ReleaseInRepo, error) {
	wdb := r.dbProvider.WriteDB(ctx)
	releaseMod := r.cvter.EntityToModel.Release(release)

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

	// fill back id
	return r.cvter.ModelToEntity.Release(releaseMod), nil
}

func (r *releaseDriver) Load(ctx context.Context, id uint64) (*relent.ReleaseInRepo, error) {
	rdb := r.dbProvider.ReadDB(ctx)
	releaseMod := &relmod.Release{}

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

	return r.cvter.ModelToEntity.Release(releaseMod), nil
}

func (r *releaseDriver) Query(ctx context.Context, opts ...repoopt.Option) ([]*relent.ReleaseInRepo, error) {
	rdb := r.dbProvider.ReadDB(ctx)
	releases := []*relmod.Release{}

	rdb = r.buildModel(rdb)

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

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

	return contutil.TransformSlice(releases, r.cvter.ModelToEntity.Release), nil
}

func (r *releaseDriver) Count(ctx context.Context, opts ...repoopt.Option) (int64, error) {
	db := r.dbProvider.ReadDB(ctx).Model(&relmod.Release{})
	db = repoopt.Aggregate(opts...).Apply(db)

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

	return count, nil
}

func (r *releaseDriver) buildModel(db *gorm.DB) *gorm.DB {
	db = db.Model(&relmod.Release{})

	return db
}