// This file is part of arduino-cli.
//
// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
//
// This software is released under the GNU General Public License version 3,
// which covers the main part of arduino-cli.
// The terms of this license can be found at:
// https://www.gnu.org/licenses/gpl-3.0.en.html
//
// You can be released from the requirements of the above licenses by purchasing
// a commercial license. Buying such a license is mandatory if you want to
// modify or otherwise use the software for commercial activities involving the
// Arduino software without disclosing the source code of your own applications.
// To purchase a commercial license, send an email to license@arduino.cc.

package configuration

import (
	"fmt"
	"net/url"
	"os"
	"runtime"

	"github.com/arduino/arduino-cli/cli/globals"
	"github.com/spf13/viper"
)

// UserAgent returns the user agent (mainly used by HTTP clients)
func UserAgent(settings *viper.Viper) string {
	subComponent := ""
	if settings != nil {
		subComponent = settings.GetString("network.user_agent_ext")
	}
	if subComponent != "" {
		subComponent = " " + subComponent
	}

	extendedUA := os.Getenv("ARDUINO_CLI_USER_AGENT_EXTENSION")
	if extendedUA != "" {
		extendedUA = " " + extendedUA
	}

	return fmt.Sprintf("%s/%s%s (%s; %s; %s) Commit:%s%s",
		globals.VersionInfo.Application,
		globals.VersionInfo.VersionString,
		subComponent,
		runtime.GOARCH, runtime.GOOS, runtime.Version(),
		globals.VersionInfo.Commit,
		extendedUA)
}

// NetworkProxy returns the proxy configuration (mainly used by HTTP clients)
func NetworkProxy(settings *viper.Viper) (*url.URL, error) {
	if settings == nil || !settings.IsSet("network.proxy") {
		return nil, nil
	}
	if proxyConfig := settings.GetString("network.proxy"); proxyConfig == "" {
		// empty configuration
		// this workaround must be here until viper can UnSet properties:
		// https://github.com/spf13/viper/pull/519
		return nil, nil
	} else if proxy, err := url.Parse(proxyConfig); err != nil {
		return nil, fmt.Errorf(tr("Invalid network.proxy '%[1]s': %[2]s"), proxyConfig, err)
	} else {
		return proxy, nil
	}
}
