var plans = {
  beginner: {
    id: 'beginner',
    name: '初级 (7天)',
    totalDays: 7,
    description: '适合初学者，从30秒起步',
    days: [
      { day: 1, target: 30 },
      { day: 2, target: 40 },
      { day: 3, target: 50 },
      { day: 4, target: 60 },
      { day: 5, target: 70 },
      { day: 6, target: 80 },
      { day: 7, target: 90 }
    ]
  },
  intermediate: {
    id: 'intermediate',
    name: '中级 (14天)',
    totalDays: 14,
    description: '有一定基础，从60秒起步',
    days: [
      { day: 1, target: 60 }, { day: 2, target: 60 },
      { day: 3, target: 75 }, { day: 4, target: 75 },
      { day: 5, target: 90 }, { day: 6, target: 90 },
      { day: 7, target: 105 }, { day: 8, target: 105 },
      { day: 9, target: 120 }, { day: 10, target: 120 },
      { day: 11, target: 135 }, { day: 12, target: 135 },
      { day: 13, target: 150 }, { day: 14, target: 150 }
    ]
  },
  advanced: {
    id: 'advanced',
    name: '高级 (30天)',
    totalDays: 30,
    description: '挑战自我，从90秒起步',
    days: (function () {
      var arr = []
      for (var i = 1; i <= 30; i++) {
        arr.push({ day: i, target: 90 + Math.floor((i - 1) / 3) * 15 })
      }
      return arr
    })()
  }
}

function getPlan(planId) {
  return plans[planId] || plans.beginner
}

function getTodayTarget(planId, currentDay) {
  var plan = getPlan(planId)
  for (var i = 0; i < plan.days.length; i++) {
    if (plan.days[i].day === currentDay) return plan.days[i].target
  }
  return plan.days[0].target
}

function getPlanDay(planId, records) {
  var plan = getPlan(planId)
  var now = new Date()
  var today = now.getFullYear() + '-' +
    ('0' + (now.getMonth() + 1)).slice(-2) + '-' +
    ('0' + now.getDate()).slice(-2)
  var dates = {}
  records.forEach(function (r) {
    if (r.date !== today) dates[r.date] = true
  })
  var trainedDays = Object.keys(dates).length
  return Math.min(trainedDays + 1, plan.totalDays)
}

module.exports = { plans: plans, getPlan: getPlan, getTodayTarget: getTodayTarget, getPlanDay: getPlanDay }