package chat

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"time"
)

const adminChatCountsCacheTTL = 5 * time.Second

func (r *Repository) adminChatCountsCacheKey(principal Principal, filter, stage, keyword string) string {
	sum := sha256.Sum256([]byte(keyword))
	return fmt.Sprintf("admin-chat:counts:v2:%s:%d:%s:%s:%s", principal.Type, principal.ID, filter, stage, hex.EncodeToString(sum[:8]))
}

func (r *Repository) loadAdminChatCountsCache(ctx context.Context, principal Principal, filter, stage, keyword string) *AdminConversationCountsDTO {
	if r.redis == nil {
		return nil
	}
	raw, err := r.redis.Get(ctx, r.adminChatCountsCacheKey(principal, filter, stage, keyword)).Bytes()
	if err != nil {
		return nil
	}
	var value AdminConversationCountsDTO
	if err := json.Unmarshal(raw, &value); err != nil {
		return nil
	}
	return &value
}

func (r *Repository) storeAdminChatCountsCache(ctx context.Context, principal Principal, filter, stage, keyword string, value *AdminConversationCountsDTO) {
	if r.redis == nil || value == nil {
		return
	}
	raw, err := json.Marshal(value)
	if err != nil {
		return
	}
	_ = r.redis.Set(ctx, r.adminChatCountsCacheKey(principal, filter, stage, keyword), raw, adminChatCountsCacheTTL).Err()
}