package model

import (
	"fmt"
	"log"

	"github.com/robfig/cron/v3"
	"gorm.io/gorm"

	"github.com/nezhahq/nezha/pkg/utils"
	pb "github.com/nezhahq/nezha/proto"
)

const (
	_ = iota
	TaskTypeHTTPGet
	TaskTypeICMPPing
	TaskTypeTCPPing
	TaskTypeCommand
	TaskTypeTerminal
	TaskTypeUpgrade
	TaskTypeKeepalive
	TaskTypeTerminalGRPC
	TaskTypeNAT
	TaskTypeReportHostInfoDeprecated
	TaskTypeFM
)

type TerminalTask struct {
	StreamID string
}

type TaskNAT struct {
	StreamID string
	Host     string
}

type TaskFM struct {
	StreamID string
}

const (
	ServiceCoverAll = iota
	ServiceCoverIgnoreAll
)

type Service struct {
	Common
	Name                string `json:"name"`
	Type                uint8  `json:"type"`
	Target              string `json:"target"`
	SkipServersRaw      string `json:"-"`
	Duration            uint64 `json:"duration"`
	Notify              bool   `json:"notify,omitempty"`
	NotificationGroupID uint64 `json:"notification_group_id"` // 当前服务监控所属的通知组 ID
	Cover               uint8  `json:"cover"`

	EnableTriggerTask      bool   `gorm:"default: false" json:"enable_trigger_task,omitempty"`
	EnableShowInService    bool   `gorm:"default: false" json:"enable_show_in_service,omitempty"`
	FailTriggerTasksRaw    string `gorm:"default:'[]'" json:"-"`
	RecoverTriggerTasksRaw string `gorm:"default:'[]'" json:"-"`

	FailTriggerTasks    []uint64 `gorm:"-" json:"fail_trigger_tasks"`    // 失败时执行的触发任务id
	RecoverTriggerTasks []uint64 `gorm:"-" json:"recover_trigger_tasks"` // 恢复时执行的触发任务id

	MinLatency    float32 `json:"min_latency"`
	MaxLatency    float32 `json:"max_latency"`
	LatencyNotify bool    `json:"latency_notify,omitempty"`

	SkipServers map[uint64]bool `gorm:"-" json:"skip_servers"`
	CronJobID   cron.EntryID    `gorm:"-" json:"-"`
}

func (m *Service) PB() *pb.Task {
	return &pb.Task{
		Id:   m.ID,
		Type: uint64(m.Type),
		Data: m.Target,
	}
}

// CronSpec 返回服务监控请求间隔对应的 cron 表达式
func (m *Service) CronSpec() string {
	if m.Duration == 0 {
		// 默认间隔 30 秒
		m.Duration = 30
	}
	return fmt.Sprintf("@every %ds", m.Duration)
}

func (m *Service) BeforeSave(tx *gorm.DB) error {
	if data, err := utils.Json.Marshal(m.SkipServers); err != nil {
		return err
	} else {
		m.SkipServersRaw = string(data)
	}
	if data, err := utils.Json.Marshal(m.FailTriggerTasks); err != nil {
		return err
	} else {
		m.FailTriggerTasksRaw = string(data)
	}
	if data, err := utils.Json.Marshal(m.RecoverTriggerTasks); err != nil {
		return err
	} else {
		m.RecoverTriggerTasksRaw = string(data)
	}
	return nil
}

func (m *Service) AfterFind(tx *gorm.DB) error {
	m.SkipServers = make(map[uint64]bool)
	if err := utils.Json.Unmarshal([]byte(m.SkipServersRaw), &m.SkipServers); err != nil {
		log.Println("NEZHA>> Service.AfterFind:", err)
		return nil
	}

	// 加载触发任务列表
	if err := utils.Json.Unmarshal([]byte(m.FailTriggerTasksRaw), &m.FailTriggerTasks); err != nil {
		return err
	}
	if err := utils.Json.Unmarshal([]byte(m.RecoverTriggerTasksRaw), &m.RecoverTriggerTasks); err != nil {
		return err
	}

	return nil
}

// IsServiceSentinelNeeded 判断该任务类型是否需要进行服务监控 需要则返回true
func IsServiceSentinelNeeded(t uint64) bool {
	return t != TaskTypeCommand && t != TaskTypeTerminalGRPC && t != TaskTypeUpgrade && t != TaskTypeKeepalive
}