// Copyright (C) 2021 nytpu
// SPDX-License-Identifier: AGPL-3.0-or-later
// For more license details, see LICENSE or <https://www.gnu.org/licenses/agpl-3.0.html>.

// package fetch implements routines for fetching gemini, gopher, and http
// resources and parsing feed formats
package fetch

import (
	"fmt"
	"net/url"
	"reflect"

	"golang.nytpu.com/comitium/core"
)

// Feed will fetch and insert a new core.Feed into a core.FullData given any url
// (or update if it's preexisting)
func Feed(data *core.FullData, remote *url.URL, title string) error {
	switch remote.Scheme {
	case "gemini":
		return geminiFeed(data, remote, title)
	case "http", "https":
		return httpFeed(data, remote, title)
	case "gopher", "gophers":
		return gopherFeed(data, remote, title)
	default:
		return fmt.Errorf("Unsupported protocol '%s'", remote.Scheme)
	}
}

// Page will fetch and insert a new core.Page into a core.FullData given any url
// (or update if it's preexisting)
func Page(data *core.FullData, remote *url.URL, title string) error {
	switch remote.Scheme {
	case "gemini":
		return geminiPage(data, remote, title)
	case "http", "https":
		return httpPage(data, remote, title)
	case "gopher", "gophers":
		return gopherPage(data, remote, title)
	default:
		return fmt.Errorf("Unsupported protocol '%s'", remote.Scheme)
	}
}

// InsertFeed will insert or update a core.Feed in a core.FullData
func InsertFeed(data *core.FullData, new *core.Feed, remote *url.URL) {
	data.FeedsMu.Lock()
	oldFeed, ok := data.Feeds[*remote]
	if !ok || !reflect.DeepEqual(new, oldFeed) {
		// Feeds are different, or there was never an old one
		data.Feeds[*remote] = new
		data.FeedsMu.Unlock()
	} else {
		data.FeedsMu.Unlock()
	}
}

// InsertFeed will insert or update a core.Page in a core.FullData
func InsertPage(data *core.FullData, new *core.Page, remote *url.URL) {
	data.PagesMu.Lock()
	_, ok := data.Pages[*remote]
	if !ok || data.Pages[*remote].Hash != new.Hash {
		// pages are different, or there was never an old one
		data.Pages[*remote] = new
		data.PagesMu.Unlock()
	} else {
		data.PagesMu.Unlock()
	}
}