package sqlite

import (
	"context"
	"fmt"
	"strings"
	"time"

	"git.unistack.org/unistack-org/pkgdash/internal/models"
	"git.unistack.org/unistack-org/pkgdash/internal/storage"
	pb "git.unistack.org/unistack-org/pkgdash/proto"
	"github.com/jmoiron/sqlx"
	"go.unistack.org/micro/v4/logger"
)

func init() {
	storage.RegisterStorage("sqlite", NewStorage())
}

var _ storage.Storage = (*Sqlite)(nil)

type Sqlite struct {
	db *sqlx.DB
}

func NewStorage() func(*sqlx.DB) interface{} {
	return func(db *sqlx.DB) interface{} {
		return &Sqlite{db: db}
	}
}

func (s *Sqlite) PackagesDelete(ctx context.Context, req *pb.PackagesDeleteReq) error {
	return fmt.Errorf("need implement")
}

func (s *Sqlite) PackagesUpdate(ctx context.Context, req *pb.PackagesUpdateReq) (*models.Package, error) {
	return nil, fmt.Errorf("need implement")
}

func (s *Sqlite) PackagesLookup(ctx context.Context, req *pb.PackagesLookupReq) (*models.Package, error) {
	pkg := &models.Package{}

	err := s.db.GetContext(ctx, pkg, queryPackagesLookup, req.Id)
	if err != nil {
		return nil, err
	}

	return pkg, err
}

func (s *Sqlite) PackagesList(ctx context.Context, req *pb.PackagesListReq) ([]*models.Package, error) {
	var packages []*models.Package

	err := s.db.SelectContext(ctx, &packages, queryPackagesList)
	if err != nil {
		return nil, err
	}

	return packages, nil
}

func (s *Sqlite) CommentsDelete(ctx context.Context, req *pb.CommentsDeleteReq) error {
	return nil
}

func (s *Sqlite) CommentsCreate(ctx context.Context, req *pb.CommentsCreateReq) (*models.Comment, error) {
	tx, err := s.db.BeginTx(ctx, nil)
	if err != nil {
		return nil, err
	}

	defer func() {
		if err != nil {
			if rollbackErr := tx.Rollback(); rollbackErr != nil {
				logger.Errorf(ctx, "AddComment: unable to rollback: %v", rollbackErr)
			}
		} else {
			err = tx.Commit()
		}
	}()

	if _, err = tx.ExecContext(ctx, queryCommentsCreate, req.Comment, req.PackageId); err != nil {
		return nil, err
	}

	return nil, nil
}

func (s *Sqlite) PackagesProcess(ctx context.Context, td time.Duration) ([]*models.Package, error) {
	var packages []*models.Package
	err := s.db.SelectContext(ctx, &packages, queryPackagesProcess, td.Seconds())
	if err != nil {
		return nil, err
	}

	return packages, nil
}

func (s *Sqlite) PackagesCreate(ctx context.Context, req *pb.PackagesCreateReq) (*models.Package, error) {
	pkg := &models.Package{}
	err := s.db.GetContext(ctx, pkg, queryPackagesCreate, req.Name, req.Url)
	if err != nil {
		return nil, err
	}

	return pkg, nil
}

func (s *Sqlite) PackagesModulesCreate(ctx context.Context, pkg *models.Package, modules []*models.Module) error {
	tx, err := s.db.BeginTxx(ctx, nil)
	if err != nil {
		return err
	}

	for _, mod := range modules {
		err = tx.GetContext(ctx, mod, queryModulesCreate, mod.Name, mod.Version, mod.LastVersion, mod.Package)
		if err != nil {
			_ = tx.Rollback()
			return err
		}
	}

	if _, err = tx.ExecContext(ctx, queryPackagesModulesCount, pkg.ID, len(modules)); err != nil {
		_ = tx.Rollback()
		return err
	}

	if err = tx.Commit(); err != nil {
		_ = tx.Rollback()
		return err
	}

	return nil
}

func (s *Sqlite) ModulesList(ctx context.Context, req *pb.ModulesListReq) ([]*models.Module, error) {
	var err error
	var modules []*models.Module

	rows, err := s.db.QueryContext(ctx, queryModulesList)
	if err != nil {
		return nil, err
	}
	defer func() {
		if err = rows.Close(); err != nil {
			return
		}
		err = rows.Err()
	}()

	for ; rows.Err() == nil; rows.Next() {
		mod := &models.Module{}
		if err = rows.Scan(
			&mod.ID,
			&mod.Name,
			&mod.Version,
			&mod.LastVersion,
		); err != nil {
			return nil, err
		}

		modules = append(modules, mod)
	}

	if err = rows.Err(); err != nil {
		return nil, err
	}

	if err = rows.Close(); err != nil {
		return nil, err
	}

	return modules, nil
}

func (s *Sqlite) CommentsList(ctx context.Context, req *pb.CommentsListReq) ([]*models.Comment, error) {
	var comments []*models.Comment

	err := s.db.SelectContext(ctx, &comments, queryCommentsList, req.PackageId)
	if err != nil {
		return nil, err
	}

	return comments, nil
}

func generateQuery(rsp []models.Module) string {
	const pattern = `%c('%s', '%s', '%s')`
	build := strings.Builder{}
	comma := ' '
	for i := range rsp {
		str := fmt.Sprintf(pattern, comma, rsp[i].Name, rsp[i].Version, rsp[i].LastVersion)
		build.WriteString(str)
		comma = ','
	}

	return fmt.Sprintf(queryInsMsgGetIDs, build.String())
}