/**
 * 字体大小工具函数
 * 提供响应式字体大小计算能力
 */

const FONT_BASE = 16 // Android 默认字体大小基准
const MIN_SCALE = 0.85
const MAX_SCALE = 1.45

/**
 * 获取当前字体缩放比例
 * @returns {number} 缩放比例 (0.85 ~ 1.45)
 */
function getFontScale() {
  if (getApp().globalData && getApp().globalData.fontScale) {
    return getApp().globalData.fontScale
  }
  
  const stored = uni.getStorageSync('fontScale')
  if (stored) {
    return parseFloat(stored)
  }
  
  return 1
}

/**
 * 计算响应式字体大小
 * @param {number} basePx - 基础字体大小(px)
 * @param {boolean} round - 是否四舍五入取整
 * @returns {string} - 如 "15px" 或 "14.5px"
 */
function responsiveSize(basePx, round = true) {
  const scale = getFontScale()
  const size = basePx * scale
  
  if (round) {
    return `${Math.round(size)}px`
  }
  return `${Math.round(size * 10) / 10}px`
}

export default {
  getFontScale,
  responsiveSize,
  
  // 常用预设
  presets: {
    xs: () => responsiveSize(10),
    sm: () => responsiveSize(11),
    base: () => responsiveSize(13),
    md: () => responsiveSize(14),
    lg: () => responsiveSize(16),
    xl: () => responsiveSize(20),
    xxl: () => responsiveSize(24)
  }
}