package info

import "math/rand"

// PlayerCaptureContext 用户捕捉上下文（每次登录创建）
type PlayerCaptureContext struct {
	Random      *rand.Rand
	Denominator int         // 统一分母=1000
	DecayFactor float64     // 衰减系数
	MinDecayNum int         // 衰减分子最小值
	Guarantees  map[int]int // 按分母分组的保底分子 map[denominator]numerator
}

// Roll 通用概率判定（带共享保底） 返回成功,基础,保底
func (c *PlayerCaptureContext) Roll(numerator, denominator int) (bool, float64, float64) {
	if denominator <= 0 {
		return false, 0, 0
	}

	base := float64(numerator) / float64(denominator)
	bonus := float64(c.getGuaranteeNumerator(denominator)) / float64(denominator)
	total := base + bonus
	if total > 1.0 {
		total = 1.0
	}

	success := c.Random.Float64() < total

	if success {
		c.resetGuarantee(denominator)
	} else {
		c.increaseGuarantee(denominator)
	}

	return success, base * 100, bonus * 100
}

// 保底操作
func (c *PlayerCaptureContext) getGuaranteeNumerator(denominator int) int {
	if num, ok := c.Guarantees[denominator]; ok {
		return num
	}
	return 0
}
func (c *PlayerCaptureContext) increaseGuarantee(denominator int) {
	c.Guarantees[denominator]++
}
func (c *PlayerCaptureContext) resetGuarantee(denominator int) {
	c.Guarantees[denominator] = 0
}