/**
 * 近战戳刺段时序：与弓 PROJECTILE_FLY_SPEED 同模型，
 * duration = dist / (pxPerSec * aspd)，戳刺像素速度随攻速线性提升。
 */

/** @aspd=1 瞄准插值基准秒数（角向，与距离无关） */
export const MELEE_AIM_SEC = 0.12;

/** @aspd=1 戳刺逻辑像素/秒（约 84px / 0.07s） */
export const MELEE_THRUST_PX_PER_SEC = 1200;

/** @aspd=1 收回逻辑像素/秒（约 84px / 0.1s） */
export const MELEE_RETURN_PX_PER_SEC = 840;

/** 戳刺/收回段最短时长，避免极短距离时帧级闪烁 */
export const MELEE_MIN_PHASE_SEC = 0.03;

/** 攻击被打断后 atkParent 复位插值（与攻速无关） */
export const MELEE_RESTORE_SEC = 0.1;

export interface MeleeThrustTimingOpts {
    aimSec?: number;
    thrustPxPerSec?: number;
    returnPxPerSec?: number;
    minPhaseSec?: number;
}

/** 按戳刺距离与攻速计算瞄准/戳刺/收回时长 */
export function calcMeleeThrustPhaseDurations(
    thrustDistPx: number,
    aspdScale: number,
    opts?: MeleeThrustTimingOpts,
): { aimDur: number; thrustDur: number; returnDur: number } {
    const aspd = Math.max(0.01, aspdScale);
    const dist = Math.max(0, thrustDistPx);
    const aimSec = opts?.aimSec ?? MELEE_AIM_SEC;
    const thrustSpd = opts?.thrustPxPerSec ?? MELEE_THRUST_PX_PER_SEC;
    const returnSpd = opts?.returnPxPerSec ?? MELEE_RETURN_PX_PER_SEC;
    const minSec = opts?.minPhaseSec ?? MELEE_MIN_PHASE_SEC;
    return {
        aimDur: aimSec / aspd,
        thrustDur: Math.max(minSec, dist / (thrustSpd * aspd)),
        returnDur: Math.max(minSec, dist / (returnSpd * aspd)),
    };
}