// linksexp -- Texinfo/XBEL/OPML/urls autogeneration from recfile bookmark
// Copyright (C) 2021-2024 Sergey Matveev <stargrave@stargrave.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package main

import (
	"encoding/xml"
	"os"
)

type Link struct {
	Href string `xml:"href,attr"`
}

type Feed struct {
	Owner string `xml:"owner,attr"`
	Link  Link   `xml:"link"`
}

type Bookmark struct {
	Href  string `xml:"href,attr"`
	Title string `xml:"title"`
	Feeds []Feed `xml:"info>metadata,omitempty"`
}

type Folder struct {
	Title     string     `xml:"title"`
	Bookmarks []Bookmark `xml:"bookmark"`
}

type XBEL struct {
	XMLName xml.Name `xml:"xbel"`
	Version string   `xml:"version,attr"`
	Folders []Folder `xml:"folder"`
}

func xbel(cats []string, data map[string][]map[string][]string) {
	folders := make([]Folder, 0, len(cats))
	for _, cat := range cats {
		ents := data[cat]
		bs := make([]Bookmark, 0, len(ents))
		for _, ent := range ents {
			b := Bookmark{Href: ent["URL"][0], Title: ent["Title"][0]}
			for _, url := range ent["Feed"] {
				b.Feeds = append(b.Feeds, Feed{Owner: "webfeed", Link: Link{url}})
			}
			bs = append(bs, b)
		}
		folders = append(folders, Folder{Title: cat, Bookmarks: bs})
	}
	x := XBEL{Version: "1.0", Folders: folders}
	out, err := xml.MarshalIndent(&x, "", "  ")
	if err != nil {
		panic(err)
	}
	os.Stdout.WriteString("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
	os.Stdout.WriteString("<!DOCTYPE xbel>\n")
	os.Stdout.Write(out)
}