package models

import (
	"encoding/json"
	"fmt"
	"main/configs"
	"net/http"
	"time"

	"github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common"
	"github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common/errors"
	"github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common/profile"
	cvm "github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/cvm/v20170312"
)

type Server struct {
	ID        int                      `json:"id" gorm:"primary_key"`
	Name      string                   `json:"name"`
	Type      string                   `json:"type"` // (訓練|推理)
	IP        string                   `json:"ip"`
	Port      int                      `json:"port"`
	Status    string                   `json:"status"` // (異常|初始化|閒置|就緒|工作中|關閉中)
	UserName  string                   `json:"username"`
	Password  string                   `json:"password"`
	Models    []map[string]interface{} `json:"models" gorm:"-"` // 數據庫不必保存
	CreatedAt time.Time                `json:"created_at" gorm:"autoCreateTime"`
	UpdatedAt time.Time                `json:"updated_at" gorm:"autoUpdateTime"`
}

type Config struct {
	TencentCloud struct {
		SecretId  string `yaml:"SecretId"`
		SecretKey string `yaml:"SecretKey"`
	} `yaml:"TencentCloud"`
}

// 通過腾讯云API創建服務器
func CreateServerByTencentCloud(SecretId, SecretKey string) error {
	credential := common.NewCredential(SecretId, SecretKey)
	cpf := profile.NewClientProfile()
	cpf.HttpProfile.Endpoint = "cvm.tencentcloudapi.com"
	client, err := cvm.NewClient(credential, "ap-shanghai", cpf)
	if err != nil {
		return fmt.Errorf("初始化騰訊雲SDK客戶端失敗: %v", err)
	}

	// 实例化一个请求对象,每个接口都会对应一个request对象
	request := cvm.NewRunInstancesRequest()

	// 指定啓動模板, 以創建指定規格的服務器
	request.LaunchTemplate = &cvm.LaunchTemplate{
		LaunchTemplateId: common.StringPtr("lt-ks6y5evh"),
	}

	// 返回的resp是一个RunInstancesResponse的实例，与请求对象对应
	response, err := client.RunInstances(request)
	if _, ok := err.(*errors.TencentCloudSDKError); ok {
		return fmt.Errorf("已返回 API 错误: %v", err)
	}
	if err != nil {
		return fmt.Errorf("运行实例失败: %v", err)
	}
	// 输出json格式的字符串回包
	fmt.Printf("%s", response.ToJsonString())
	return nil
}

// 通過腾讯云API註銷指定的服務器
func TerminateServerByTencentCloud(SecretId, SecretKey string) error {
	credential := common.NewCredential(SecretId, SecretKey)
	cpf := profile.NewClientProfile()
	cpf.HttpProfile.Endpoint = "cvm.tencentcloudapi.com"
	client, err := cvm.NewClient(credential, "ap-shanghai", cpf)
	if err != nil {
		return fmt.Errorf("初始化騰訊雲SDK客戶端失敗: %v", err)
	}

	// 实例化一个请求对象,每个接口都会对应一个request对象
	request := cvm.NewTerminateInstancesRequest()

	// 指定要註銷的服務器ID
	request.InstanceIds = []*string{common.StringPtr("ins-q0z8ev39")}

	// 返回的resp是一个TerminateInstancesResponse的实例，与请求对象对应
	response, err := client.TerminateInstances(request)
	if _, ok := err.(*errors.TencentCloudSDKError); ok {
		return fmt.Errorf("已返回 API 错误: %v", err)
	}
	if err != nil {
		return fmt.Errorf("註銷實例失敗: %v", err)
	}
	// 输出json格式的字符串回包
	fmt.Printf("%s", response.ToJsonString())
	return nil
}

// 檢查騰訊雲中的服務器狀態
func CheckServerStatusByTencentCloud(SecretId, SecretKey string) error {
	credential := common.NewCredential(SecretId, SecretKey)
	cpf := profile.NewClientProfile()
	cpf.HttpProfile.Endpoint = "cvm.tencentcloudapi.com"
	client, err := cvm.NewClient(credential, "ap-shanghai", cpf)
	if err != nil {
		return fmt.Errorf("初始化騰訊雲SDK客戶端失敗: %v", err)
	}

	// 实例化一个请求对象,每个接口都会对应一个request对象
	request := cvm.NewDescribeInstancesRequest()

	// 返回的resp是一个DescribeInstancesResponse的实例，与请求对象对应
	response, err := client.DescribeInstances(request)
	if _, ok := err.(*errors.TencentCloudSDKError); ok {
		return fmt.Errorf("已返回 API 错误: %v", err)
	}
	if err != nil {
		return fmt.Errorf("运行实例失败: %v", err)
	}
	// 输出json格式的字符串回包
	fmt.Printf("%s", response.ToJsonString())

	// 解析JSON
	var data map[string]interface{}
	if err := json.Unmarshal([]byte(response.ToJsonString()), &data); err != nil {
		return err
	}
	fmt.Println(data["TotalCount"])
	fmt.Println(data["InstanceSet"])
	// TODO: 判斷每臺服務器狀態

	return nil
}

func (server *Server) CheckStatus() error {
	switch server.Type {
	case "訓練":
		resp, err := http.Get(fmt.Sprintf("http://%s:%d/dreambooth/status", server.IP, server.Port))
		if err != nil {
			server.Status = "異常"
			return err
		}
		defer resp.Body.Close()

		// 解碼JSON
		var data map[string]interface{}
		if err := json.NewDecoder(resp.Body).Decode(&data); err != nil {
			return err
		}

		// 解碼JSON
		var current_state map[string]interface{}
		if err := json.Unmarshal([]byte(data["current_state"].(string)), &current_state); err != nil {
			return err
		}
		//log.Println("current_state:", current_state)

		// 檢查服務器是否正常
		if !current_state["active"].(bool) {
			server.Status = "異常"
			return fmt.Errorf("服務器狀態異常: active=false")
		}
		server.Status = "正常"
	case "推理":
		server.Status = "異常"
	default:
		server.Status = "異常"
	}

	// 檢查服務器是否正常
	return nil
}

func init() {
	configs.ORMDB().AutoMigrate(&Server{})
	// 檢查所有服務器的狀態, 無效的服務器設置為異常
	var servers []Server
	configs.ORMDB().Find(&servers)
	for _, server := range servers {
		server.CheckStatus()
	}
}