package scrape

import (
	"fmt"
	"log"
	"subscribe-bot/db"
	"subscribe-bot/osuapi"
	"time"
)

func (s *Scraper) scrapePendingMaps() {
	// build a list of currently tracked mappers
	trackedMappers := make(map[int]int)
	s.db.IterAllTrackedMappers(func(mapper db.User) error {
		trackedMappers[mapper.ID] = 1
		return nil
	})

	// TODO: is this sorted for sure??
	pendingSets, err := s.api.SearchBeatmaps("pending")
	if err != nil {
		log.Println("error fetching pending sets", err)
		s.bot.NotifyError("failed to fetch pending sets", err)
		return
	}

	allNewMaps := make(map[int][]osuapi.Beatmapset, 0)
	var newLastUpdateTime = time.Unix(0, 0)
	for _, beatmapSet := range pendingSets.Beatmapsets {
		updatedTime, err := time.Parse(time.RFC3339, beatmapSet.LastUpdated)
		if err != nil {
			log.Println("error parsing last updated time", updatedTime)
		}

		if updatedTime.After(newLastUpdateTime) {
			// update lastUpdateTime to latest updated map
			newLastUpdateTime = updatedTime
		}

		if !updatedTime.After(lastUpdateTime) {
			break
		}

		mapperId := beatmapSet.UserID
		if _, ok := trackedMappers[mapperId]; ok {
			if _, ok2 := allNewMaps[mapperId]; !ok2 {
				allNewMaps[mapperId] = make([]osuapi.Beatmapset, 0)
			}

			allNewMaps[mapperId] = append(allNewMaps[mapperId], beatmapSet)
		}
	}

	if len(allNewMaps) > 0 {
		for mapperId, newMaps := range allNewMaps {
			channels := make([]string, 0)
			s.db.IterTrackingChannels(mapperId, func(channel db.DiscordChannel) error {
				channels = append(channels, channel.ID)
				return nil
			})

			err := s.bot.NotifyNewBeatmap(channels, newMaps)
			if err != nil {
				log.Println("error notifying new maps:", err)
			}
		}
	}

	lastUpdateTime = newLastUpdateTime
	log.Println("last updated time", lastUpdateTime)
}

func getNewMaps(db *db.Db, api *osuapi.Osuapi, userId int) (newMaps []osuapi.Event, err error) {
	// see if there's a last event
	hasLastEvent, lastEventId := db.MapperLastEvent(userId)
	newMaps = make([]osuapi.Event, 0)
	var (
		events            []osuapi.Event
		newLatestEvent    = 0
		updateLatestEvent = false
	)
	if hasLastEvent {
		offset := 0

	loop:
		for {
			events, err = api.GetUserEvents(userId, 50, offset)
			if err != nil {
				err = fmt.Errorf("couldn't load events for user %d, offset %d: %w", userId, offset, err)
				return
			}
			if len(events) == 0 {
				break
			}

			for _, event := range events {
				if event.ID == lastEventId {
					break loop
				}

				if event.ID > newLatestEvent {
					updateLatestEvent = true
					newLatestEvent = event.ID
				}

				if event.Type == "beatmapsetUpload" ||
					event.Type == "beatmapsetRevive" ||
					event.Type == "beatmapsetUpdate" {
					newMaps = append(newMaps, event)
				}
			}

			offset += len(events)
		}
	} else {
		log.Printf("no last event id found for %d\n", userId)
		events, err = api.GetUserEvents(userId, 50, 0)
		if err != nil {
			return
		}

		for _, event := range events {
			if event.ID > newLatestEvent {
				updateLatestEvent = true
				newLatestEvent = event.ID
			}

			if event.Type == "beatmapsetUpload" ||
				event.Type == "beatmapsetRevive" ||
				event.Type == "beatmapsetUpdate" {
				newMaps = append(newMaps, event)
			}
		}
	}

	if updateLatestEvent {
		err = db.UpdateMapperLastEvent(userId, newLatestEvent)
		if err != nil {
			return
		}
	}

	return
}