// 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 core

import (
	"context"
	"errors"
	"fmt"

	"github.com/arduino/arduino-cli/arduino/cores"
	"github.com/arduino/arduino-cli/arduino/cores/packagemanager"
	"github.com/arduino/arduino-cli/commands"
	rpc "github.com/arduino/arduino-cli/rpc/commands"
)

// PlatformDownload FIXMEDOC
func PlatformDownload(ctx context.Context, req *rpc.PlatformDownloadReq, downloadCB commands.DownloadProgressCB) (*rpc.PlatformDownloadResp, error) {
	pm := commands.GetPackageManager(req.GetInstance().GetId())
	if pm == nil {
		return nil, errors.New("invalid instance")
	}

	version, err := commands.ParseVersion(req)
	if err != nil {
		return nil, fmt.Errorf("invalid version: %s", err)
	}

	platform, tools, err := pm.FindPlatformReleaseDependencies(&packagemanager.PlatformReference{
		Package:              req.PlatformPackage,
		PlatformArchitecture: req.Architecture,
		PlatformVersion:      version,
	})
	if err != nil {
		return nil, fmt.Errorf("find platform dependencies: %s", err)
	}

	err = downloadPlatform(pm, platform, downloadCB)
	if err != nil {
		return nil, err
	}

	for _, tool := range tools {
		err := downloadTool(pm, tool, downloadCB)
		if err != nil {
			return nil, fmt.Errorf("downloading tool %s: %s", tool, err)
		}
	}

	return &rpc.PlatformDownloadResp{}, nil
}

func downloadPlatform(pm *packagemanager.PackageManager, platformRelease *cores.PlatformRelease, downloadCB commands.DownloadProgressCB) error {
	// Download platform
	config, err := commands.GetDownloaderConfig()
	if err != nil {
		return err
	}
	resp, err := pm.DownloadPlatformRelease(platformRelease, config)
	if err != nil {
		return err
	}
	return commands.Download(resp, platformRelease.String(), downloadCB)
}

func downloadTool(pm *packagemanager.PackageManager, tool *cores.ToolRelease, downloadCB commands.DownloadProgressCB) error {
	// Check if tool has a flavor available for the current OS
	if tool.GetCompatibleFlavour() == nil {
		return fmt.Errorf("tool %s not available for the current OS", tool)
	}

	return commands.DownloadToolRelease(pm, tool, downloadCB)
}