package rest

import (
	"context"
	"errors"
	"git.nspix.com/golang/micro/gateway/http"
	"gorm.io/gorm"
)

var (
	std *CRUD
)

var (
	ErrUninitializedComponent = errors.New("uninitialized component")
)

func Init(dialer gorm.Dialector) (err error) {
	std, err = New(dialer)
	return
}

func Instance() *CRUD {
	return std
}

func DB() (db *gorm.DB, err error) {
	if std == nil {
		return nil, ErrUninitializedComponent
	}
	return std.db, nil
}

//WithDelegate 添加一个观察者
func WithDelegate(ctx context.Context, d Delegate) (err error) {
	if std == nil {
		return ErrUninitializedComponent
	}
	std.RegisterDelegate(d)
	return nil
}

//AttachModel 添加一个模块
func AttachModel(ctx context.Context, model Model, cbs ...Option) (err error) {
	if std == nil {
		return ErrUninitializedComponent
	}
	return std.Attach(ctx, model, cbs...)
}

//GetSchemas 获取模块的schema
func GetSchemas(ctx context.Context, model Model) ([]*Schema, error) {
	if std == nil {
		return nil, ErrUninitializedComponent
	}
	return std.GetSchemas(ctx, DefaultNamespace, model.ModuleName(), model.TableName())
}

//UseRouter 绑定路由
func UseRouter(hs *http.Server, ms ...http.Middleware) (err error) {
	if std == nil {
		return ErrUninitializedComponent
	}
	std.api.Router(hs, ms...)
	return
}