/*
Copyright (c) 2015 VMware, Inc. 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 logs

import (
	"context"
	"flag"
	"fmt"
	"path"

	"github.com/vmware/govmomi/govc/cli"
	"github.com/vmware/govmomi/govc/flags"
	"github.com/vmware/govmomi/object"
	"github.com/vmware/govmomi/vim25"
	"github.com/vmware/govmomi/vim25/soap"
	"github.com/vmware/govmomi/vim25/types"
)

type download struct {
	*flags.DatacenterFlag

	IncludeDefault bool
}

func init() {
	cli.Register("logs.download", &download{})
}

func (cmd *download) Register(ctx context.Context, f *flag.FlagSet) {
	cmd.DatacenterFlag, ctx = flags.NewDatacenterFlag(ctx)
	cmd.DatacenterFlag.Register(ctx, f)

	f.BoolVar(&cmd.IncludeDefault, "default", true, "Specifies if the bundle should include the default server")
}

func (cmd *download) Process(ctx context.Context) error {
	if err := cmd.DatacenterFlag.Process(ctx); err != nil {
		return err
	}
	return nil
}

func (cmd *download) Usage() string {
	return "[PATH]..."
}

func (cmd *download) Description() string {
	return `Generate diagnostic bundles.

A diagnostic bundle includes log files and other configuration information.

Use PATH to include a specific set of hosts to include.

Examples:
  govc logs.download
  govc logs.download host-a host-b`
}

func (cmd *download) DownloadFile(c *vim25.Client, b string) error {
	u, err := c.Client.ParseURL(b)
	if err != nil {
		return err
	}

	dst := path.Base(u.Path)
	p := soap.DefaultDownload
	if cmd.OutputFlag.TTY {
		logger := cmd.ProgressLogger(fmt.Sprintf("Downloading %s... ", dst))
		defer logger.Wait()
		p.Progress = logger
	}

	return c.Client.DownloadFile(dst, u, &p)
}

func (cmd *download) GenerateLogBundles(m *object.DiagnosticManager, host []*object.HostSystem) ([]types.DiagnosticManagerBundleInfo, error) {
	ctx := context.TODO()
	logger := cmd.ProgressLogger("Generating log bundles... ")
	defer logger.Wait()

	task, err := m.GenerateLogBundles(ctx, cmd.IncludeDefault, host)
	if err != nil {
		return nil, err
	}

	r, err := task.WaitForResult(ctx, logger)
	if err != nil {
		return nil, err
	}

	return r.Result.(types.ArrayOfDiagnosticManagerBundleInfo).DiagnosticManagerBundleInfo, nil
}

func (cmd *download) Run(ctx context.Context, f *flag.FlagSet) error {
	finder, err := cmd.Finder()
	if err != nil {
		return err
	}

	var host []*object.HostSystem

	for _, arg := range f.Args() {
		hs, err := finder.HostSystemList(ctx, arg)
		if err != nil {
			return err
		}

		host = append(host, hs...)
	}

	c, err := cmd.Client()
	if err != nil {
		return err
	}

	m := object.NewDiagnosticManager(c)

	bundles, err := cmd.GenerateLogBundles(m, host)
	if err != nil {
		return err
	}

	for _, bundle := range bundles {
		err := cmd.DownloadFile(c, bundle.Url)
		if err != nil {
			return err
		}
	}

	return nil
}
