package common

import (
	"database/sql"

	qgen "git.tuxpa.in/a/gosora/query_gen"
)

var Subscriptions SubscriptionStore

// ? Should we have a subscription store for each zone? topic, forum, etc?
type SubscriptionStore interface {
    Add(uid, elementID int, elementType string) error
    Delete(uid, targetID int, targetType string) error
    DeleteResource(targetID int, targetType string) error
}

type DefaultSubscriptionStore struct {
    add            *sql.Stmt
    delete         *sql.Stmt
    deleteResource *sql.Stmt
}

func NewDefaultSubscriptionStore() (*DefaultSubscriptionStore, error) {
    acc := qgen.NewAcc()
    ast := "activity_subscriptions"
    return &DefaultSubscriptionStore{
        add:            acc.Insert(ast).Columns("user,targetID,targetType,level").Fields("?,?,?,2").Prepare(),
        delete:         acc.Delete(ast).Where("user=? AND targetID=? AND targetType=?").Prepare(),
        deleteResource: acc.Delete(ast).Where("targetID=? AND targetType=?").Prepare(),
    }, acc.FirstError()
}

func (s *DefaultSubscriptionStore) Add(uid, elementID int, elementType string) error {
    _, err := s.add.Exec(uid, elementID, elementType)
    return err
}

// TODO: Add a primary key to the activity subscriptions table
func (s *DefaultSubscriptionStore) Delete(uid, targetID int, targetType string) error {
    _, err := s.delete.Exec(uid, targetID, targetType)
    return err
}

func (s *DefaultSubscriptionStore) DeleteResource(targetID int, targetType string) error {
    _, err := s.deleteResource.Exec(targetID, targetType)
    return err
}