package ops

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

// Zeros creates a new zero-filled tensor
func Zeros(shape tensor.Shape) *cpu.Tensor {
	return cpu.NewTensor(shape, nil) // Go zeros by default
}

// Ones creates a new tensor filled with 1.0
func Ones(shape tensor.Shape) *cpu.Tensor {
	data := make([]float32, shape.NumElements())
	for i := range data {
		data[i] = 1.0
	}
	return cpu.NewTensor(shape, data)
}

// Full creates a new tensor filled with a specific value
func Full(shape tensor.Shape, value float32) *cpu.Tensor {
	data := make([]float32, shape.NumElements())
	for i := range data {
		data[i] = value
	}
	return cpu.NewTensor(shape, data)
}

// Arange creates a 1D tensor with values [start, start+step, start+2*step, ...)
func Arange(start, end, step float32) *cpu.Tensor {
	n := int((end - start) / step)
	if n <= 0 {
		return cpu.NewTensor(tensor.Shape{0}, nil)
	}
	data := make([]float32, n)
	for i := 0; i < n; i++ {
		data[i] = start + float32(i)*step
	}
	return cpu.NewTensor(tensor.Shape{n}, data)
}