package classify

import "fmt"

// 暗色阈值等级（从高到低）
var darkThresholds = []int{100, 95, 85, 75, 65, 55}

// 亮色阈值等级（从高到低）
var brightThresholds = []int{85, 75, 65, 55, 45, 35, 25, 15}

// BrightnessName 按主导分判定明暗等级，返回如 "dark_100" / "bright_85"。
// 亮色主导（lightScore > darkScore）归 bright，否则归 dark，每张图必归亮暗之一。
func BrightnessName(darkScore, lightScore float64) string {
	darkLowest := darkThresholds[len(darkThresholds)-1]
	brightLowest := brightThresholds[len(brightThresholds)-1]

	if lightScore > darkScore {
		picked := brightLowest
		for _, t := range brightThresholds {
			if lightScore >= float64(t)/100.0 {
				picked = t
				break
			}
		}
		return fmt.Sprintf("bright_%d", picked)
	}
	picked := darkLowest
	for _, t := range darkThresholds {
		if darkScore >= float64(t)/100.0 {
			picked = t
			break
		}
	}
	return fmt.Sprintf("dark_%d", picked)
}