package nn

import (
	"makarna/pkg/backend/cpu"
	"makarna/pkg/backend/cpu/matmul"
	"makarna/pkg/backend/cpu/ops"
	"makarna/pkg/tensor"
)

// SwiGLUMLP computes the SwiGLU MLP block:
// gate = x @ wGate
// up = x @ wUp
// hidden = SwiGLU(gate, up)
// out = hidden @ wDown
func SwiGLUMLP(x, wGate, wUp, wDown *cpu.Tensor) *cpu.Tensor {
	seqLen := x.Shape()[0]
	intermediate := wGate.Shape()[0]
	hiddenSize := wDown.Shape()[0]

	gate := ops.Zeros(tensor.Shape{seqLen, intermediate})
	up := ops.Zeros(tensor.Shape{seqLen, intermediate})

	matmul.Linear(x, wGate, gate)
	matmul.Linear(x, wUp, up)

	SwiGLU(gate, up, gate)

	out := ops.Zeros(tensor.Shape{seqLen, hiddenSize})
	matmul.Linear(gate, wDown, out)

	return out
}