package indicator

import (
	"sig-pub/pkg/types"
)

// RSI stateless indicator
// 相对强弱指数 (RSI) rsi define: https://www.investopedia.com/terms/r/rsi.asp
type SMA struct {
}

// indicator interface
func (c *SMA) Meta() IndicatorMeta {
	return IndicatorMeta{
		Name: "SMA",
		Input: []types.InputArg{
			{Name: "window", Type: types.InputTypeUInt, Desc: "窗口大小", Default: 9},
			{Name: "pt", Type: types.InputTypePriceType, Desc: "k线序列类型", Default: types.PriceTypeDefault},
		},
	}
}

func (c *SMA) CandlePeriods(ctx IIndicatorContext) int16 {
	return ctx.Input().Int16("window")
}

// Calculate 计算单根k线sma指标
func (c *SMA) Calculate(ctx IIndicatorContext) (vector float64) {
	window := ctx.Input().Int16("window")
	pt := ctx.Input().PriceType()
	priceSeries := ctx.Series(0, window).Price(pt)
	// sma := talib.Sma(closeSeries, int(window))
	// _ = sma[len(sma)-1]
	vector = priceSeries.Avg()
	return
}