package database

import (
	"time"
)

type Post struct {
	ID        uint16    `json:"id"`
	Title     string    `json:"title"`
	ShortPost string    `json:"short_post" db:"short_post"`
	FullPost  string    `json:"full_post" db:"full_post"`
	Date      time.Time `json:"date"`
	AuthorID  uint64    `json:"author_id" db:"author_id" sql:"REFERENCES users(id)"`
	Author    string    `json:"author"`
}

func FetchTotalNews() (int, error) {
	count := 0
	err := Database.Get(&count, `select count("news") from news;`)
	return count, err
}
func FetchNews(offset, limit int) ([]Post, error) {
	news := make([]Post, 0)
	err := Database.Select(&news, "select news.*, u.username as author from news inner join users u on news.author_id = u.id offset $1 limit $2;", offset, limit)
	return news, err
}
func CreatePost(post *Post) (*Post, error) {
	destPost := new(Post)
	r, err := Database.NamedQuery("insert into news (title, short_post, full_post, author_id) values (:title, :short_post, :full_post, :author_id) returning *;", post)
	if err != nil {
		return nil, err
	}
	if r.Next() {
		err = r.StructScan(destPost)
	}
	return destPost, err
}

func FetchPost(id int) (*Post, error) {
	post := &Post{}
	err := Database.Get(post, "select news.*, u.username as author from news inner join users u on news.author_id = u.id where news.id = $1;", id)
	return post, err
}
func UpdatePost(post *Post) error {
	_, err := Database.NamedExec("update news set title=:title, short_post=:short_post, full_post=:full_post where id=:id;", post)
	return err
}
func DeletePost(id int) error {
	_, err := Database.Exec("delete from news where id=$1;", id)
	return err
}