package services

import (
	"context"
	"fmt"
	"sync"

	"git.solsynth.dev/hydrogen/dealer/pkg/hyper"
	"git.solsynth.dev/hydrogen/dealer/pkg/proto"
	"git.solsynth.dev/hydrogen/messaging/pkg/internal/database"
	"git.solsynth.dev/hydrogen/messaging/pkg/internal/gap"
	"git.solsynth.dev/hydrogen/messaging/pkg/internal/models"
)

type statusQueryCacheEntry struct {
	Target []uint64
	Data   any
}

var statusQueryCacheLock sync.Mutex

// Map for caching typing status queries [channel id][user id]
var statusQueryCache = make(map[uint]map[uint]statusQueryCacheEntry)

func SetTypingStatus(channelId uint, userId uint) error {
	var broadcastTarget []uint64
	var data any

	hitCache := false
	if channelLevel, ok := statusQueryCache[channelId]; ok {
		if entry, ok := channelLevel[userId]; ok {
			broadcastTarget = entry.Target
			data = entry.Data
			hitCache = true
		}
	}

	if !hitCache {
		var account models.Account
		if err := database.C.Where("external_id = ?", userId).First(&account).Error; err != nil {
			return fmt.Errorf("account not found: %v", err)
		}

		var member models.ChannelMember
		if err := database.C.
			Where("account_id = ? AND channel_id = ?", account.ID, channelId).
			First(&member).Error; err != nil {
			return fmt.Errorf("channel member not found: %v", err)
		} else {
			member.Account = account
		}

		var channel models.Channel
		if err := database.C.
			Preload("Members").
			Preload("Members.Account").
			Where("id = ?", channelId).
			First(&channel).Error; err != nil {
			return fmt.Errorf("channel not found: %v", err)
		}

		for _, item := range channel.Members {
			broadcastTarget = append(broadcastTarget, uint64(item.Account.ExternalID))
		}

		data = map[string]any{
			"user_id":    userId,
			"member_id":  member.ID,
			"channel_id": channelId,
			"member":     member,
			"channel":    channel,
		}

		// Cache queries
		statusQueryCacheLock.Lock()
		if _, ok := statusQueryCache[channelId]; !ok {
			statusQueryCache[channelId] = make(map[uint]statusQueryCacheEntry)
		}
		statusQueryCache[channelId][userId] = statusQueryCacheEntry{broadcastTarget, data}
		statusQueryCacheLock.Unlock()
	}

	sc := proto.NewStreamControllerClient(gap.H.GetDealerGrpcConn())
	_, err := sc.PushStreamBatch(context.Background(), &proto.PushStreamBatchRequest{
		UserId: broadcastTarget,
		Body: hyper.NetworkPackage{
			Action:  "status.typing",
			Payload: data,
		}.Marshal(),
	})

	if len(statusQueryCache) > 512 {
		statusQueryCacheLock.Lock()
		clear(statusQueryCache)
		statusQueryCacheLock.Unlock()
	}

	return err
}