package rankings

import (
	"context"
	"fmt"
	"github.com/redis/go-redis/v9"
)

// Ranking 排行榜结构体
type Ranking struct {
	c *redis.Client
}

const EcpmRankingsListPrefix = "ecpm:rankings:"

// NewRanking 创建一个新的排行榜实例
func NewRanking(c *redis.Client) *Ranking {
	return &Ranking{
		c: c,
	}
}

func GetRankingsCacheKey(appId uint32, t uint32) string {
	return fmt.Sprintf("%sappId:%d:type:%d", EcpmRankingsListPrefix, appId, t)
}

// SetList 向排行榜中添加成员及其分数
func (r *Ranking) SetList(ctx context.Context, key string, data ...redis.Z) {
	r.c.ZAdd(ctx, key, data...)
}

// GetList 获取排行榜，按照分数从高到低排序
func (r *Ranking) GetList(ctx context.Context, key string, start, stop int64) (data []redis.Z, err error) {
	return r.c.ZRevRangeWithScores(ctx, key, start, stop).Result()
}

// GetRank 获取指定成员在排行榜中的排名（排名从 0 开始，分数越高排名越靠前）
func (r *Ranking) GetRank(ctx context.Context, key, member string) (rank int64, err error) {
	return r.c.ZRevRank(ctx, key, member).Result()
}

// GetScore 获取指定成员在排行榜中的分数
func (r *Ranking) GetScore(ctx context.Context, key, member string) (score float64, err error) {
	return r.c.ZScore(ctx, key, member).Result()
}