/*
Copyright (c) 2015-2017 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 nfc

import (
	"context"
	"errors"
	"fmt"
	"io"
	"path"

	"github.com/vmware/govmomi/property"
	"github.com/vmware/govmomi/vim25"
	"github.com/vmware/govmomi/vim25/methods"
	"github.com/vmware/govmomi/vim25/mo"
	"github.com/vmware/govmomi/vim25/soap"
	"github.com/vmware/govmomi/vim25/types"
)

type Lease struct {
	types.ManagedObjectReference

	c *vim25.Client
}

func NewLease(c *vim25.Client, ref types.ManagedObjectReference) *Lease {
	return &Lease{ref, c}
}

// Abort wraps methods.Abort
func (l *Lease) Abort(ctx context.Context, fault *types.LocalizedMethodFault) error {
	req := types.HttpNfcLeaseAbort{
		This:  l.Reference(),
		Fault: fault,
	}

	_, err := methods.HttpNfcLeaseAbort(ctx, l.c, &req)
	if err != nil {
		return err
	}

	return nil
}

// Complete wraps methods.Complete
func (l *Lease) Complete(ctx context.Context) error {
	req := types.HttpNfcLeaseComplete{
		This: l.Reference(),
	}

	_, err := methods.HttpNfcLeaseComplete(ctx, l.c, &req)
	if err != nil {
		return err
	}

	return nil
}

// GetManifest wraps methods.GetManifest
func (l *Lease) GetManifest(ctx context.Context) error {
	req := types.HttpNfcLeaseGetManifest{
		This: l.Reference(),
	}

	_, err := methods.HttpNfcLeaseGetManifest(ctx, l.c, &req)
	if err != nil {
		return err
	}

	return nil
}

// Progress wraps methods.Progress
func (l *Lease) Progress(ctx context.Context, percent int32) error {
	req := types.HttpNfcLeaseProgress{
		This:    l.Reference(),
		Percent: percent,
	}

	_, err := methods.HttpNfcLeaseProgress(ctx, l.c, &req)
	if err != nil {
		return err
	}

	return nil
}

type LeaseInfo struct {
	types.HttpNfcLeaseInfo

	Items []FileItem
}

func (l *Lease) newLeaseInfo(li *types.HttpNfcLeaseInfo, items []types.OvfFileItem) (*LeaseInfo, error) {
	info := &LeaseInfo{
		HttpNfcLeaseInfo: *li,
	}

	for _, device := range li.DeviceUrl {
		u, err := l.c.ParseURL(device.Url)
		if err != nil {
			return nil, err
		}

		if device.SslThumbprint != "" {
			// TODO: prefer host management IP
			l.c.SetThumbprint(u.Host, device.SslThumbprint)
		}

		if len(items) == 0 {
			// this is an export
			item := types.OvfFileItem{
				DeviceId: device.Key,
				Path:     device.TargetId,
				Size:     device.FileSize,
			}

			if item.Size == 0 {
				item.Size = li.TotalDiskCapacityInKB * 1024
			}

			if item.Path == "" {
				item.Path = path.Base(device.Url)
			}

			info.Items = append(info.Items, NewFileItem(u, item))

			continue
		}

		// this is an import
		for _, item := range items {
			if device.ImportKey == item.DeviceId {
				info.Items = append(info.Items, NewFileItem(u, item))
				break
			}
		}
	}

	return info, nil
}

func (l *Lease) Wait(ctx context.Context, items []types.OvfFileItem) (*LeaseInfo, error) {
	var lease mo.HttpNfcLease

	pc := property.DefaultCollector(l.c)
	err := property.Wait(ctx, pc, l.Reference(), []string{"state", "info", "error"}, func(pc []types.PropertyChange) bool {
		done := false

		for _, c := range pc {
			if c.Val == nil {
				continue
			}

			switch c.Name {
			case "error":
				val := c.Val.(types.LocalizedMethodFault)
				lease.Error = &val
				done = true
			case "info":
				val := c.Val.(types.HttpNfcLeaseInfo)
				lease.Info = &val
			case "state":
				lease.State = c.Val.(types.HttpNfcLeaseState)
				if lease.State != types.HttpNfcLeaseStateInitializing {
					done = true
				}
			}
		}

		return done
	})

	if err != nil {
		return nil, err
	}

	if lease.State == types.HttpNfcLeaseStateReady {
		return l.newLeaseInfo(lease.Info, items)
	}

	if lease.Error != nil {
		return nil, errors.New(lease.Error.LocalizedMessage)
	}

	return nil, fmt.Errorf("unexpected nfc lease state: %s", lease.State)
}

func (l *Lease) StartUpdater(ctx context.Context, info *LeaseInfo) *LeaseUpdater {
	return newLeaseUpdater(ctx, l, info)
}

func (l *Lease) Upload(ctx context.Context, item FileItem, f io.Reader, opts soap.Upload) error {
	if opts.Progress == nil {
		opts.Progress = item
	}

	// Non-disk files (such as .iso) use the PUT method.
	// Overwrite: t header is also required in this case (ovftool does the same)
	if item.Create {
		opts.Method = "PUT"
		opts.Headers = map[string]string{
			"Overwrite": "t",
		}
	} else {
		opts.Method = "POST"
		opts.Type = "application/x-vnd.vmware-streamVmdk"
	}

	return l.c.Upload(ctx, f, item.URL, &opts)
}

func (l *Lease) DownloadFile(ctx context.Context, file string, item FileItem, opts soap.Download) error {
	if opts.Progress == nil {
		opts.Progress = item
	}

	return l.c.DownloadFile(ctx, file, item.URL, &opts)
}