93 lines
3.0 KiB
Go
93 lines
3.0 KiB
Go
package strategy
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import (
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"bindbox-game/internal/repository/mysql/dao"
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"context"
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"crypto/hmac"
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"crypto/sha256"
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"encoding/binary"
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"errors"
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"fmt"
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)
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type ichibanStrategy struct {
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read *dao.Query
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write *dao.Query
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}
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func NewIchiban(read *dao.Query, write *dao.Query) ActivityDrawStrategy {
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return &ichibanStrategy{read: read, write: write}
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}
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func (s *ichibanStrategy) PreChecks(ctx context.Context, activityID int64, issueID int64, userID int64) error {
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return nil
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}
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func (s *ichibanStrategy) SelectItem(ctx context.Context, activityID int64, issueID int64, userID int64) (int64, map[string]any, error) {
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return 0, nil, errors.New("ichiban strategy requires SelectItemBySlot")
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}
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func (s *ichibanStrategy) SelectItemBySlot(ctx context.Context, activityID int64, issueID int64, slotIndex int64) (int64, map[string]any, error) {
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act, err := s.read.Activities.WithContext(ctx).Where(s.read.Activities.ID.Eq(activityID)).First()
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if err != nil || act == nil || len(act.CommitmentSeedMaster) == 0 {
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return 0, nil, errors.New("commitment not found")
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}
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rewards, err := s.read.ActivityRewardSettings.WithContext(ctx).ReadDB().Where(s.read.ActivityRewardSettings.IssueID.Eq(issueID)).Order(
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s.read.ActivityRewardSettings.IsBoss.Desc(),
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s.read.ActivityRewardSettings.Level.Asc(),
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s.read.ActivityRewardSettings.Sort.Asc(),
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s.read.ActivityRewardSettings.ID.Asc(),
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).Find()
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if err != nil || len(rewards) == 0 {
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return 0, nil, errors.New("no rewards")
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}
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// 一番赏：每种奖品 = 1个格位，无数量概念
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totalSlots := int64(len(rewards))
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if totalSlots <= 0 {
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return 0, nil, errors.New("no slots")
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}
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if slotIndex < 0 || slotIndex >= totalSlots {
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return 0, nil, errors.New("slot out of range")
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}
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// build list: 每个reward直接对应一个slot
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slots := make([]int64, totalSlots)
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for i, r := range rewards {
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slots[i] = r.ID
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}
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// deterministic shuffle by CommitmentSeedMaster
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seedKey := act.CommitmentSeedMaster
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mac := hmac.New(sha256.New, seedKey)
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for i := int(totalSlots - 1); i > 0; i-- {
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mac.Reset()
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mac.Write([]byte(fmt.Sprintf("shuffle:%d|issue:%d", i, issueID)))
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sum := mac.Sum(nil)
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rnd := int(binary.BigEndian.Uint64(sum[:8]) % uint64(i+1))
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slots[i], slots[rnd] = slots[rnd], slots[i]
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}
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picked := slots[slotIndex]
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// Calculate seed hash for proof
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sha := sha256.Sum256(seedKey)
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seedHash := fmt.Sprintf("%x", sha)
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proof := map[string]any{
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"total_slots": totalSlots,
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"slot_index": slotIndex,
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"seed_hash": seedHash,
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"seed_type": "commitment",
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}
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return picked, proof, nil
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}
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func (s *ichibanStrategy) GrantReward(ctx context.Context, userID int64, rewardID int64) error {
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// 一番赏模式下不再需要扣减数量，因为每个奖品对应唯一格位
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// 格位占用通过 issue_position_claims 表来追踪，而非 quantity 字段
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// 这里保留接口兼容性，实际的占用检查在调用方完成
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return nil
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}
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func (s *ichibanStrategy) PostEffects(ctx context.Context, userID int64, activityID int64, issueID int64, rewardID int64) error {
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return nil
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}
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