// Copyright 2013 Google Inc.  All rights reserved.
// Copyright 2016 the gousb Authors.  All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package usbid

import (
	"log"
	"net/http"
	"strings"
	"time"

	"github.com/google/gousb"
)

const (
	// LinuxUsbDotOrg is one source of files in the format used by this package.
	LinuxUsbDotOrg = "http://www.linux-usb.org/usb.ids"
)

var (
	// Vendors stores the vendor and product ID mappings.
	Vendors map[gousb.ID]*Vendor

	// Classes stores the class, subclass and protocol mappings.
	Classes map[gousb.Class]*Class
)

// LoadFromURL replaces the built-in vendor and class mappings with ones loaded
// from the given URL.
//
// This should usually only be necessary if the mappings in the library are
// stale.  The contents of this file as of February 2012 are embedded in the
// library itself.
func LoadFromURL(url string) error {
	resp, err := http.Get(url)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	ids, cls, err := ParseIDs(resp.Body)
	if err != nil {
		return err
	}

	Vendors = ids
	Classes = cls
	LastUpdate = time.Now()
	return nil
}

//go:generate go run regen/regen.go --template regen/load_data.go.tpl -o load_data.go

func init() {
	ids, cls, err := ParseIDs(strings.NewReader(usbIDListData))
	if err != nil {
		log.Printf("usbid: failed to parse: %s", err)
		return
	}

	Vendors = ids
	Classes = cls
}
