// 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"

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

// NewFeed will fetch and create a new core.Feed given any url
func NewFeed(remoteURL *url.URL, title string) (*core.Feed, error) {
	switch remoteURL.Scheme {
	case "gemini":
		return newGeminiFeed(remoteURL, title)
	case "http", "https":
		return newHTTPFeed(remoteURL, title)
	case "gopher", "gophers":
		return newGopherFeed(remoteURL, title)
	default:
		return nil, fmt.Errorf("Unsupported protocol '%s'", remoteURL.Scheme)
	}
}

// NewPage will fetch and create a new core.Page given any url
func NewPage(remoteURL *url.URL, title string) (*core.Page, error) {
	switch remoteURL.Scheme {
	case "gemini":
		return newGeminiPage(remoteURL, title)
	case "http", "https":
		return newHTTPPage(remoteURL, title)
	case "gopher", "gophers":
		return newGopherPage(remoteURL, title)
	default:
		return nil, fmt.Errorf("Unsupported protocol '%s'", remoteURL.Scheme)
	}
}

// UpdateFeed will check an existing core.Feed for updates
func UpdateFeed(f *core.Feed) error {
	switch f.FeedLink.Scheme {
	case "gemini":
		// return updateGeminiFeed(f)
		// TODO
		fallthrough
	case "http", "https":
		// return updateHTTPFeed(f)
		// TODO
		fallthrough
	case "gopher", "gophers":
		return updateGopherFeed(f)
	default:
		return fmt.Errorf("Unsupported protocol '%s'", f.FeedLink.Scheme)
	}
	return nil
}

// UpdatePage will check an existing core.Page for updages
func UpdatePage(p *core.Page) error {
	switch p.Link.Scheme {
	case "gemini":
		return updateGeminiPage(p)
	case "http", "https":
		return updateHTTPPage(p)
	case "gopher", "gophers":
		return updateGopherPage(p)
	default:
		return fmt.Errorf("Unsupported protocol '%s'", p.Link.Scheme)
	}
	return nil
}