/**
 * 关卡配置：难度随关卡递增，驱动“再闯一关”动力
 */
export function getLevelConfig(levelId) {
    const lv = Math.max(1, Math.min(999, Number(levelId) || 1))
    const tier = Math.floor((lv - 1) / 5)

    return {
        id: lv,
        moves: Math.max(14, 26 - tier * 2 - (lv % 3)),
        goalTargets: [8 + tier * 2 + (lv % 2), 10 + tier * 2 + Math.floor(lv / 4)],
        scoreTarget: 2800 + lv * 450,
        startGlucose: 50,
        /** 餐后消化倒计时（秒）：归零时按棋盘上剩余食物升糖 */
        digestIntervalSec: Math.max(5, 10 - tier),
        digestMultiplier: 1 + tier * 0.12,
        boosters: {
            insulin: Math.max(1, 3 - Math.floor(tier / 2)),
            fiber: tier >= 3 ? 0 : 1,
            meal: Math.max(2, 5 - tier)
        }
    }
}

/** 根据本局表现计算 1~3 星 */
export function calcLevelStars({ movesLeft, glucoseLevel, score, levelConfig }) {
    let stars = 1
    const stable = glucoseLevel >= 30 && glucoseLevel <= 70
    if (stable && movesLeft >= 2) stars = 2
    if (stars >= 2 && score >= (levelConfig?.scoreTarget ?? 3000) && movesLeft >= 4) stars = 3
    return stars
}