package transformer

// Qwen2DecoderLayer 定义单层 Decoder 的接口
type Qwen2DecoderLayer interface {
	Forward(hiddenStates interface{}, attentionMask interface{},
		positionIds interface{}, pastKV interface{}) (output interface{}, newKV interface{}, err error)
}

// Qwen2Model 为主网络
type Qwen2Model struct {
	*Qwen2PreTrainedModel             // 组合方式复用基类功能
	EmbedTokens           interface{} // Token 嵌入层
	Layers                []Qwen2DecoderLayer
}

func (m *Qwen2Model) Forward(inputIDs []int, attentionMask []int, positionIDs []int, pastKV [][]interface{}) (interface{}, error) {
	// 模拟 token 嵌入
	hiddenStates := m.embedTokensForward(inputIDs)
	var updatedKV [][]interface{}
	// 遍历每一层 Decoder
	for i, layer := range m.Layers {
		var pastKVLayer interface{}
		if pastKV != nil && i < len(pastKV) {
			pastKVLayer = pastKV[i]
		}
		output, newKV, err := layer.Forward(hiddenStates, attentionMask, positionIDs, pastKVLayer)
		if err != nil {
			return nil, err
		}
		hiddenStates = output
		updatedKV = append(updatedKV, newKV)
	}
	return struct {
		LastHiddenState interface{}
		PastKeyValues   [][]interface{}
	}{LastHiddenState: hiddenStates, PastKeyValues: updatedKV}, nil
}

// embedTokensForward 为嵌入层的模拟实现
func (m *Qwen2Model) embedTokensForward(inputIDs []int) interface{} {
	// 根据 inputIDs 返回对应的嵌入向量
	return nil
}
