package news

import (
    "time"
    "database/sql"	
	_ "github.com/lib/pq"
	"fmt"
	"github.com/dballard/transmet/categories"

)

type News struct {
    news_id int
    Url		string
    Title	string
    Category_id	int
    Date	time.Time	
    Notes	string
    Expoerted bool
}

type NewsContainer struct {
    Name string
    News []News
    Children map[int]*NewsContainer
}

func (news *News) Insert(db *sql.DB) error {
    _, err := db.Exec("INSERT INTO news (url, title, category_id, notes) VALUES($1, $2, $3, $4)", news.Url, news.Title, news.Category_id, news.Notes );
    if err != nil {
        fmt.Println("Error inserting news: ", err)
        return err
    }
    return nil
}

func nullStringToString(str *sql.NullString) string {
    if str.Valid {
        return str.String
    } else {
        return ""
    }
}

func Unexported(db *sql.DB) (map[int]*NewsContainer, error) {
    categories.LoadCategories(db)

	rows, err := db.Query("SELECT url, title, category_id, timestamp, notes FROM news WHERE exported=false order by category_id ASC")
	if err != nil {
		fmt.Println("DB errpr reading unexported news: ", err)
		return nil, err
	}
	newsTree := map[int]*NewsContainer{}
	newsFlat := map[int]*NewsContainer{}
	
	for rows.Next() {
	    news := News{}
	    var url, title, notes sql.NullString 
	    var date, category_id sql.NullInt64
	    err := rows.Scan(&url, &title, &category_id, &news.Date, &notes)
	    if err != nil {
	        fmt.Println("Error reading news from DB: " + err.Error())
	        return nil, err
	    }
	    
	    news.Url = nullStringToString(&url)
	    news.Title = nullStringToString(&title)
	    news.Notes = nullStringToString(&notes)
	    
	    if date.Valid {
	    	news.Date = time.Unix(date.Int64, 0)
	    } else {
	    	news.Date = time.Now()	    
	    }
	    
	    cid := 1
	    if category_id.Valid {
	        cid = int(category_id.Int64)
	    }
	    
	    var container *NewsContainer
	    var ok bool
	    fmt.Println("cid: ", cid)
	    if container, ok = newsFlat[cid]; !ok {
	        fmt.Println("ADDING")
	        // need new container for new cid
	        container = &NewsContainer{ Name: categories.CategoriesFlat[cid].Name, News: []News{}, Children: map[int]*NewsContainer{} }
	        newsFlat[cid] = container
	        parent := categories.CategoriesFlat[cid].Parent
	        if parent.Valid {
	            fmt.Println("parent: ", parent.Int64)
				newsFlat[int(parent.Int64)].Children[cid] = container
	        } else {
	            fmt.Println("no parent")
	            newsTree[cid] = container
	        }
	    } 
	    container.News = append(container.News, news)
	}
	
	return newsTree, nil
}