package rss

import (
	"fmt"
	"io/ioutil"
	"local/rssmon3/config"
	"net/http"
	"net/url"
	"regexp"
	"strings"
	"time"

	"github.com/mmcdole/gofeed"
)

const nsItems = "nsItems"

type Item struct {
	Title   string
	Link    string
	Content string
	TS      time.Time
}

func newItem(i *gofeed.Item, contentFilter string) (*Item, error) {
	item := &Item{
		Title:   i.Title,
		Link:    i.Link,
		Content: i.Content,
		TS:      latestTSPtr(i.UpdatedParsed, i.PublishedParsed),
	}

	if item.Content == "" {
		item.Content = i.Description
	}
	if item.Content == "" {
		resp, err := http.Get(item.Link)
		if err != nil {
			return nil, err
		}
		defer resp.Body.Close()
		b, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			return nil, err
		}
		item.Content = string(b)
	}
	if unescaped, err := url.QueryUnescape(item.Content); err == nil {
		item.Content = unescaped
	}

	if contentFilter == "" {
		contentFilter = ".*"
	}
	item.Content = strings.Join(regexp.MustCompile(contentFilter).FindAllString(item.Content, -1), "<br>")

	item.Content = fmt.Sprintf(`<a href="%s">%s</a><br>%s`, item.Link, item.Title, item.Content)

	return item, nil
}

func (i *Item) Encode() ([]byte, error) {
	return config.Encode(i)
}

func (i *Item) Decode(b []byte) error {
	return config.Decode(b, i)
}

func (i *Item) save(ns1 string, ns ...string) error {
	db := config.Values().DB
	b, err := i.Encode()
	if err != nil {
		return err
	}
	return db.Set(i.ID(), b, append([]string{nsItems, ns1}, ns...)...)
}

func (i *Item) ID() string {
	return fmt.Sprintf("%s:%s", i.TS.Format("2006-01-02-15-04"), i.Link)
}

func (i *Item) Load(key, ns1 string, ns ...string) error {
	db := config.Values().DB
	b, err := db.Get(key, append([]string{nsItems, ns1}, ns...)...)
	if err != nil {
		return err
	}
	return config.Decode(b, i)
}