package models

import (
	"log"
	"time"

	"rocketgit.ru/rsmon/worker/app/models/concerns"
	"rocketgit.ru/rsmon/worker/internal/workdays"
)

// Notification provides functionality.
type Notification struct {
	concerns.Model

	Name       string    `json:"name" gorm:"not null"`
	AccountID  int64     `gorm:"type:bigint REFERENCES accounts(id)" json:"account_id"`
	Account    *Account  `json:"-"`
	Enabled    bool      `gorm:"not null;default:true" json:"enabled"`
	ContactIDs []int64   `gorm:"-:all" json:"contact_ids"`
	Contacts   []Contact `gorm:"many2many:notification_contacts;" json:"contacts,omitempty"`
	GroupIDs   []int64   `gorm:"-:all" json:"group_ids"`
	Groups     []Group   `gorm:"many2many:notification_groups;" json:"-"`
	AlertDelay *int64    `json:"alert_delay,omitempty"`
	// RepeatAlert      *int64    `json:"repeat_alert,omitempty"`
	BeforeExpiration *int64 `json:"before_expiration,omitempty"`

	NotifyDown    bool `gorm:"default:true" json:"notify_down"`
	NotifyRestore bool `gorm:"default:true" json:"notify_restore"`

	NotifyWHOIS bool `gorm:"default:true" json:"notify_whois"`
	NotifySSL   bool `gorm:"default:true" json:"notify_ssl"`

	NotifyDays     *int `json:"notify_days"`
	NotifyDayStart *int `json:"notify_day_start"`
	NotifyDayEnd   *int `json:"notify_day_end"`
	NotifyHolidays bool `gorm:"default:true" json:"notify_holidays"`

	Messages []Message `json:"-"`

	concerns.Timestamped
	Audited
}

const notificationDebug = false

// EnabledNow checks if the notification is enabled at the given time.
func (n *Notification) EnabledNow(tn *time.Time) bool {
	weekday := int(tn.Weekday())
	// делаем из 0-воскр 1-пн 6-сб вариант 0-пн 6-воскр
	if weekday == 0 {
		weekday = 7
	}
	weekday--
	if notificationDebug {
		log.Println("notification", n.ID, "check enabled now at", tn, "for day", weekday)
	}

	if !n.NotifyHolidays {
		c := workdays.GetCalendar()
		if !c.IsWorkday(*tn) {
			if notificationDebug {
				log.Println("notification", n.ID, "is not enabled on holiday", tn)
			}
			return false
		}
	}

	minusOneDay := false
	notifyFromDay := true

	if n.NotifyDayStart != nil && n.NotifyDayEnd != nil {
		bod := BeginningOfDay(*tn)
		secondsToday := int(tn.Sub(bod) / time.Second)

		ds := *n.NotifyDayStart
		de := *n.NotifyDayEnd
		// вариант 9 утра - 2 часа ночи
		if ds == de { //nolint:gocritic // complex condition chain
			notifyFromDay = true
		} else if ds > de {
			// с 0 до DayEnd
			if secondsToday < de { //nolint:gocritic // complex condition chain
				minusOneDay = true
				notifyFromDay = true
			} else if secondsToday < ds {
				// с DayEnd до DayStart
				notifyFromDay = false
			} else {
				notifyFromDay = true
			}
		} else {
			if secondsToday < ds { //nolint:gocritic // complex condition chain
				// с 0 до DayStart
				notifyFromDay = false
			} else if secondsToday > de {
				notifyFromDay = false
			} else {
				notifyFromDay = true
			}
		}
		// log.Println(secondsToday)
	}

	if !notifyFromDay {
		if notificationDebug {
			log.Println("notification", n.ID, *n.NotifyDays, "is NOT enabled as notifyFromDay", tn)
		}
		return false
	}

	// Если время 0-dayStart считаем что это прошлый день
	if minusOneDay {
		weekday--
		if weekday < 0 {
			weekday = 6
		}
	}

	if n.NotifyDays != nil {
		if !HasBit(*n.NotifyDays, uint(weekday)) {
			if notificationDebug {
				log.Println("notification", n.ID, *n.NotifyDays, "is NOT enabled on weekday", tn.Weekday(), weekday, tn)
			}
			return false
		}
		if notificationDebug {
			log.Println("notification", n.ID, *n.NotifyDays, "is enabled on weekday", tn.Weekday(), weekday, tn)
		}
	}

	if notificationDebug {
		log.Println("notification", n.ID, *n.NotifyDays, "is enabled", tn)
	}
	return true
}

// NotificationLoadIDs provides functionality.
func NotificationLoadIDs(notifications *[]Notification) {
	for i, n := range *notifications { //nolint:gocritic // range copy is acceptable here
		cids := make([]int64, len(n.Contacts))
		for i, c := range n.Contacts { //nolint:gocritic // range copy is acceptable here
			cids[i] = c.ID
		}
		(*notifications)[i].ContactIDs = cids

		gids := make([]int64, len(n.Groups))
		for j, g := range n.Groups { //nolint:gocritic // range copy is acceptable here
			gids[j] = g.ID
		}
		(*notifications)[i].GroupIDs = gids
	}
}

// PersistRelations provides functionality.
func (n *Notification) PersistRelations() error {
	cts := make([]Contact, len(n.ContactIDs))
	for i, c := range n.ContactIDs {
		ct := Contact{}
		ct.ID = c
		cts[i] = ct
	}
	err := DB().Model(&n).Association("Contacts").Replace(cts)
	if err != nil {
		return err
	}

	grp := make([]Group, len(n.GroupIDs))
	for i, g := range n.GroupIDs {
		gr := Group{}
		gr.ID = g
		grp[i] = gr
	}
	err = DB().Model(&n).Association("Groups").Replace(grp)
	if err != nil {
		return err
	}

	return nil
}

// GetContacts returns the contacts associated with this notification.
// Errors are logged and an empty slice is returned instead of panicking so
// that a single misconfigured notification cannot kill the scheduler goroutine
// that processes expiry alerts (see internal/notifier.RunExp).
func (n *Notification) GetContacts() []Contact {
	contacts := make([]Contact, 0)
	err := DB().Model(*n).Where("enabled = ?", true).Association("Contacts").Find(&contacts)
	if err != nil {
		log.Printf("notification %d: GetContacts failed: %v", n.ID, err)
		return contacts
	}
	return contacts
}