package api

import (
	"encoding/json"
	"errors"
	"fmt"
	"time"

	"github.com/sacloud/libsacloud/sacloud"
)

// SearchNFSResponse NFS検索レスポンス
type SearchNFSResponse struct {
	// Total 総件数
	Total int `json:",omitempty"`
	// From ページング開始位置
	From int `json:",omitempty"`
	// Count 件数
	Count int `json:",omitempty"`
	// NFSs NFS リスト
	NFS []sacloud.NFS `json:"Appliances,omitempty"`
}

type nfsRequest struct {
	NFS     *sacloud.NFS           `json:"Appliance,omitempty"`
	From    int                    `json:",omitempty"`
	Count   int                    `json:",omitempty"`
	Sort    []string               `json:",omitempty"`
	Filter  map[string]interface{} `json:",omitempty"`
	Exclude []string               `json:",omitempty"`
	Include []string               `json:",omitempty"`
}

type nfsResponse struct {
	*sacloud.ResultFlagValue
	*sacloud.NFS `json:"Appliance,omitempty"`
	Success      interface{} `json:",omitempty"` //HACK: さくらのAPI側仕様: 戻り値:Successがbool値へ変換できないためinterface{}
}

// NFSAPI NFSAPI
type NFSAPI struct {
	*baseAPI
}

// NewNFSAPI NFSAPI作成
func NewNFSAPI(client *Client) *NFSAPI {
	return &NFSAPI{
		&baseAPI{
			client: client,
			FuncGetResourceURL: func() string {
				return "appliance"
			},
			FuncBaseSearchCondition: func() *sacloud.Request {
				res := &sacloud.Request{}
				res.AddFilter("Class", "nfs")
				return res
			},
		},
	}
}

// Find 検索
func (api *NFSAPI) Find() (*SearchNFSResponse, error) {
	data, err := api.client.newRequest("GET", api.getResourceURL(), api.getSearchState())
	if err != nil {
		return nil, err
	}
	var res SearchNFSResponse
	if err := json.Unmarshal(data, &res); err != nil {
		return nil, err
	}
	return &res, nil
}

func (api *NFSAPI) request(f func(*nfsResponse) error) (*sacloud.NFS, error) {
	res := &nfsResponse{}
	err := f(res)
	if err != nil {
		return nil, err
	}
	return res.NFS, nil
}

func (api *NFSAPI) createRequest(value *sacloud.NFS) *nfsResponse {
	return &nfsResponse{NFS: value}
}

//func (api *NFSAPI) New() *sacloud.NFS {
//	return sacloud.CreateNewNFS()
//}

// Create 新規作成
func (api *NFSAPI) Create(value *sacloud.NFS) (*sacloud.NFS, error) {
	return api.request(func(res *nfsResponse) error {
		return api.create(api.createRequest(value), res)
	})
}

// CreateWithPlan プラン/サイズを指定してNFSを作成
func (api *NFSAPI) CreateWithPlan(value *sacloud.CreateNFSValue, plan sacloud.NFSPlan, size sacloud.NFSSize) (*sacloud.NFS, error) {

	nfs := sacloud.NewNFS(value)
	// get plan
	plans, err := api.GetNFSPlans()
	if err != nil {
		return nil, err
	}
	if plans == nil {
		return nil, errors.New("NFS plans not found")
	}

	planID := plans.FindPlanID(plan, size)
	if planID < 0 {
		return nil, errors.New("NFS plans not found")
	}

	nfs.Plan = sacloud.NewResource(planID)
	nfs.Remark.SetRemarkPlanID(planID)

	return api.request(func(res *nfsResponse) error {
		return api.create(api.createRequest(nfs), res)
	})
}

// GetNFSPlans プラン一覧取得
func (api *NFSAPI) GetNFSPlans() (*sacloud.NFSPlans, error) {
	notes, err := api.client.Note.Reset().Find()
	if err != nil {
		return nil, err
	}
	for _, note := range notes.Notes {
		if note.Class == sacloud.ENoteClass("json") && note.Name == "sys-nfs" {
			rawPlans := note.Content

			var plans struct {
				Plans *sacloud.NFSPlans `json:"plans"`
			}

			err := json.Unmarshal([]byte(rawPlans), &plans)
			if err != nil {
				return nil, err
			}

			return plans.Plans, nil
		}
	}

	return nil, nil
}

// Read 読み取り
func (api *NFSAPI) Read(id int64) (*sacloud.NFS, error) {
	return api.request(func(res *nfsResponse) error {
		return api.read(id, nil, res)
	})
}

// Update 更新
func (api *NFSAPI) Update(id int64, value *sacloud.NFS) (*sacloud.NFS, error) {
	return api.request(func(res *nfsResponse) error {
		return api.update(id, api.createRequest(value), res)
	})
}

// Delete 削除
func (api *NFSAPI) Delete(id int64) (*sacloud.NFS, error) {
	return api.request(func(res *nfsResponse) error {
		return api.delete(id, nil, res)
	})
}

// Config 設定変更の反映
func (api *NFSAPI) Config(id int64) (bool, error) {
	var (
		method = "PUT"
		uri    = fmt.Sprintf("%s/%d/config", api.getResourceURL(), id)
	)
	return api.modify(method, uri, nil)
}

// IsUp 起動しているか判定
func (api *NFSAPI) IsUp(id int64) (bool, error) {
	lb, err := api.Read(id)
	if err != nil {
		return false, err
	}
	return lb.Instance.IsUp(), nil
}

// IsDown ダウンしているか判定
func (api *NFSAPI) IsDown(id int64) (bool, error) {
	lb, err := api.Read(id)
	if err != nil {
		return false, err
	}
	return lb.Instance.IsDown(), nil
}

// Boot 起動
func (api *NFSAPI) Boot(id int64) (bool, error) {
	var (
		method = "PUT"
		uri    = fmt.Sprintf("%s/%d/power", api.getResourceURL(), id)
	)
	return api.modify(method, uri, nil)
}

// Shutdown シャットダウン(graceful)
func (api *NFSAPI) Shutdown(id int64) (bool, error) {
	var (
		method = "DELETE"
		uri    = fmt.Sprintf("%s/%d/power", api.getResourceURL(), id)
	)

	return api.modify(method, uri, nil)
}

// Stop シャットダウン(force)
func (api *NFSAPI) Stop(id int64) (bool, error) {
	var (
		method = "DELETE"
		uri    = fmt.Sprintf("%s/%d/power", api.getResourceURL(), id)
	)

	return api.modify(method, uri, map[string]bool{"Force": true})
}

// RebootForce 再起動
func (api *NFSAPI) RebootForce(id int64) (bool, error) {
	var (
		method = "PUT"
		uri    = fmt.Sprintf("%s/%d/reset", api.getResourceURL(), id)
	)

	return api.modify(method, uri, nil)
}

// ResetForce リセット
func (api *NFSAPI) ResetForce(id int64, recycleProcess bool) (bool, error) {
	var (
		method = "PUT"
		uri    = fmt.Sprintf("%s/%d/reset", api.getResourceURL(), id)
	)

	return api.modify(method, uri, map[string]bool{"RecycleProcess": recycleProcess})
}

// SleepUntilUp 起動するまで待機
func (api *NFSAPI) SleepUntilUp(id int64, timeout time.Duration) error {
	handler := waitingForUpFunc(func() (hasUpDown, error) {
		return api.Read(id)
	}, 0)
	return blockingPoll(handler, timeout)
}

// SleepUntilDown ダウンするまで待機
func (api *NFSAPI) SleepUntilDown(id int64, timeout time.Duration) error {
	handler := waitingForDownFunc(func() (hasUpDown, error) {
		return api.Read(id)
	}, 0)
	return blockingPoll(handler, timeout)
}

// SleepWhileCopying コピー終了まで待機
func (api *NFSAPI) SleepWhileCopying(id int64, timeout time.Duration, maxRetry int) error {
	handler := waitingForAvailableFunc(func() (hasAvailable, error) {
		return api.Read(id)
	}, maxRetry)
	return blockingPoll(handler, timeout)
}

// AsyncSleepWhileCopying コピー終了まで待機(非同期)
func (api *NFSAPI) AsyncSleepWhileCopying(id int64, timeout time.Duration, maxRetry int) (chan (interface{}), chan (interface{}), chan (error)) {
	handler := waitingForAvailableFunc(func() (hasAvailable, error) {
		return api.Read(id)
	}, maxRetry)
	return poll(handler, timeout)
}

// MonitorFreeDiskSize NFSディスク残量アクティビティモニター取得
func (api *NFSAPI) MonitorFreeDiskSize(id int64, body *sacloud.ResourceMonitorRequest) (*sacloud.MonitorValues, error) {
	return api.baseAPI.applianceMonitorBy(id, "database", 0, body)
}

// MonitorInterface NICアクティビティーモニター取得
func (api *NFSAPI) MonitorInterface(id int64, body *sacloud.ResourceMonitorRequest) (*sacloud.MonitorValues, error) {
	return api.baseAPI.applianceMonitorBy(id, "interface", 0, body)
}