package space

import (
	"blazing/cool"
	"math/rand"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"time"
)

// TimeBossRule describes one timed boss spawn rule.
type TimeBossRule struct {
	PetID      uint32
	Week       int
	ShowHours  []int
	ShowMinute int
	LastTime   int
	MapIDs     []uint32
}

// Timed boss schedule config.
var timeBossRules = []TimeBossRule{
	{
		PetID:      261,
		Week:       1,
		ShowHours:  []int{12, 17, 18, 24},
		ShowMinute: 35,
		LastTime:   40,
		MapIDs:     []uint32{15, 105, 54},
	},
	{
		PetID:      261,
		Week:       2,
		ShowHours:  []int{17, 18, 24},
		ShowMinute: 0,
		LastTime:   5,
		MapIDs:     []uint32{15, 105, 54},
	},
	{
		PetID:      261,
		Week:       3,
		ShowHours:  []int{17, 18, 24},
		ShowMinute: 0,
		LastTime:   5,
		MapIDs:     []uint32{15, 105, 54},
	},
	{
		PetID:      261,
		Week:       4,
		ShowHours:  []int{12, 17, 18, 24},
		ShowMinute: 35,
		LastTime:   40,
		MapIDs:     []uint32{15, 105, 54},
	},
	{
		PetID:      261,
		Week:       5,
		ShowHours:  []int{17, 18, 24},
		ShowMinute: 0,
		LastTime:   5,
		MapIDs:     []uint32{15, 105, 54},
	},
	{
		PetID:      261,
		Week:       6,
		ShowHours:  []int{17, 18, 24},
		ShowMinute: 0,
		LastTime:   5,
		MapIDs:     []uint32{15, 105, 54},
	},
	{
		PetID:      261,
		Week:       7,
		ShowHours:  generateHourRange(0, 23),
		ShowMinute: 0,
		LastTime:   10,
		MapIDs:     []uint32{15, 105, 54},
	},
}

var (
	registeredCronIDs = make(map[string]bool)
	cronMu            sync.Mutex
	randSource        = rand.New(rand.NewSource(time.Now().UnixNano()))
)

// generateHourRange builds an inclusive hour range.
func generateHourRange(start, end int) []int {
	hours := make([]int, 0, end-start+1)
	for i := start; i <= end; i++ {
		hours = append(hours, i)
	}
	return hours
}

func init() {
	for _, rule := range timeBossRules {
		for _, hour := range rule.ShowHours {
			cronID := genCronTaskID(rule.PetID, rule.Week, hour, rule.ShowMinute)
			cronMu.Lock()
			if registeredCronIDs[cronID] {
				cronMu.Unlock()
				continue
			}
			registeredCronIDs[cronID] = true
			cronMu.Unlock()

			cronExpr := genCronExpr(rule.Week, hour, rule.ShowMinute)
			currentRule := rule

			cool.Cron.AddFunc(cronExpr, func() {
				randomMapID := getRandomMapID(currentRule.MapIDs)
				if randomMapID == 0 {
					return
				}

				sp := GetSpace(randomMapID)
				if sp != nil {
					sp.refushgaiya(true)
					time.AfterFunc(time.Duration(currentRule.LastTime)*time.Minute, func() {
						sp.refushgaiya(false)
					})
				}
			})
		}
	}
}

// refushgaiya updates timed boss visibility and broadcasts it.
func (s *Space) refushgaiya(vis bool) {
	if !vis {
		atomic.StoreUint32(&s.TimeBoss.Flag, 0)
	} else {
		atomic.StoreUint32(&s.TimeBoss.Flag, 1)
	}
	atomic.StoreUint32(&s.TimeBoss.ID, 261)

	s.Broadcast(nil, 2021, &s.TimeBoss)
}

// getRandomMapID picks one random map id from candidates.
func getRandomMapID(mapIDs []uint32) uint32 {
	if len(mapIDs) == 0 {
		return 0
	}
	return mapIDs[randSource.Intn(len(mapIDs))]
}

// genCronExpr builds a Quartz-style cron expression.
func genCronExpr(week, hour, minute int) string {
	cronHour := hour
	if cronHour == 24 {
		cronHour = 0
	}

	cronWeek := week
	if cronWeek == 7 {
		cronWeek = 0
	}

	return strings.Join([]string{
		"0",
		strconv.Itoa(minute),
		strconv.Itoa(cronHour),
		"?",
		"*",
		strconv.Itoa(cronWeek),
	}, " ")
}

// genCronTaskID builds a unique task id for dedupe.
func genCronTaskID(petID uint32, week, hour, minute int) string {
	return strings.Join([]string{
		strconv.FormatUint(uint64(petID), 10),
		strconv.Itoa(week),
		strconv.Itoa(hour),
		strconv.Itoa(minute),
	}, "_")
}

// containsMapID checks whether a map id exists in the list.
func containsMapID(mapIDs []uint32, mapid uint32) bool {
	for _, id := range mapIDs {
		if id == mapid {
			return true
		}
	}
	return false
}