var app = getApp()

Page({
  data: {
    items: [],
    viewMode: "month",
    filterMonth: "",
    filterYear: "",
    customStart: "",
    customEnd: "",
    tableData: [],
    showEditModal: false,
    editingDate: "",
    editValues: {}
  },

  onLoad: function () {
    var today = this.formatDate(new Date(), "day")
    var month = today.slice(0, 7)
    var year = today.slice(0, 4)
    this.setData({
      items: app.globalData.items,
      filterMonth: month,
      filterYear: year,
      customStart: month,
      customEnd: month
    })
    this.refreshData()
  },

  onShow: function () {
    var items = app.globalData.items
    if (items.length !== this.data.items.length ||
        items.some(function (v, i) { return v !== this.data.items[i] }, this)) {
      this.setData({ items: items })
    }
    this.refreshData()
  },

  getDateRange: function () {
    var viewMode = this.data.viewMode
    var filterMonth = this.data.filterMonth
    var filterYear = this.data.filterYear
    var customStart = this.data.customStart
    var customEnd = this.data.customEnd
    var start, end, parts, y, m, sy, sm, ey, em

    if (viewMode === "month") {
      parts = filterMonth.split("-")
      y = Number(parts[0])
      m = Number(parts[1])
      start = new Date(y, m - 1, 1)
      end = new Date(y, m, 0)
    } else if (viewMode === "year") {
      y = parseInt(filterYear)
      start = new Date(y, 0, 1)
      end = new Date(y, 11, 31)
    } else {
      parts = customStart.split("-")
      sy = Number(parts[0])
      sm = Number(parts[1])
      parts = customEnd.split("-")
      ey = Number(parts[0])
      em = Number(parts[1])
      start = new Date(sy, sm - 1, 1)
      end = new Date(ey, em, 0)
    }
    return { start: start, end: end }
  },

  refreshData: function () {
    var records = app.globalData.records
    var items = this.data.items
    var range = this.getDateRange()
    var start = range.start
    var end = range.end

    var inRange = function (r) {
      var d = new Date(r.date + "T00:00:00")
      return d >= start && d <= end
    }

    var filtered = records.filter(inRange)
    this._filteredRecords = filtered

    var dateMap = {}
    filtered.forEach(function (r) {
      if (!dateMap[r.date]) dateMap[r.date] = {}
      if (!dateMap[r.date][r.item]) {
        dateMap[r.date][r.item] = { sum: 0, count: 0 }
      }
      dateMap[r.date][r.item].sum += r.value
      dateMap[r.date][r.item].count += 1
    })

    var dates = Object.keys(dateMap).sort()
    var tableData = dates.map(function (d) {
      var values = items.map(function (item) {
        var entry = dateMap[d][item]
        if (!entry) return undefined
        return Math.round((entry.sum / entry.count) * 100) / 100
      })
      return { rowKey: d, values: values }
    })

    this.setData({ tableData: tableData })
  },

  onSwitchMode: function (e) {
    var that = this
    this.setData({ viewMode: e.currentTarget.dataset.mode }, function () { that.refreshData() })
  },

  onMonthChange: function (e) {
    var that = this
    this.setData({ filterMonth: e.detail.value }, function () { that.refreshData() })
  },

  onYearChange: function (e) {
    var that = this
    this.setData({ filterYear: e.detail.value }, function () { that.refreshData() })
  },

  onCustomStartChange: function (e) {
    var that = this
    this.setData({ customStart: e.detail.value }, function () { that.refreshData() })
  },

  onCustomEndChange: function (e) {
    var that = this
    this.setData({ customEnd: e.detail.value }, function () { that.refreshData() })
  },

  onDeleteRow: function (e) {
    var dateKey = e.currentTarget.dataset.date
    var that = this
    wx.showModal({
      title: "确认删除",
      content: "删除「" + dateKey + "」的所有记录？",
      confirmColor: "#e53e3e",
      success: function (res) {
        if (!res.confirm) return
        app.globalData.records = app.globalData.records.filter(function (r) { return r.date !== dateKey })
        app.saveData()
        that.refreshData()
        wx.showToast({ title: "已删除", icon: "success", duration: 1000 })
      }
    })
  },

  onEditRow: function (e) {
    var dateKey = e.currentTarget.dataset.date
    var items = this.data.items

    var editValues = {}
    var records = this._filteredRecords || []
    items.forEach(function (item) {
      var related = records.filter(function (r) { return r.item === item && r.date === dateKey })
      if (related.length > 0) {
        var sum = related.reduce(function (s, r) { return s + r.value }, 0)
        var avg = sum / related.length
        editValues[item] = String(Math.round(avg * 100) / 100)
      } else {
        editValues[item] = ""
      }
    })

    this.setData({
      showEditModal: true,
      editingDate: dateKey,
      editValues: editValues
    })
  },

  onEditValueInput: function (e) {
    var item = e.currentTarget.dataset.item
    var update = {}
    update["editValues." + item] = e.detail.value
    this.setData(update)
  },

  saveEdit: function () {
    var editingDate = this.data.editingDate
    var editValues = this.data.editValues
    var items = this.data.items
    var savedCount = 0
    var that = this

    app.globalData.records = app.globalData.records.filter(function (r) { return r.date !== editingDate })

    items.forEach(function (item) {
      var raw = editValues[item]
      if (!raw || raw.trim() === "") return
      var v = parseFloat(raw)
      if (isNaN(v) || v <= 0) return
      app.globalData.records.push({
        id: Date.now().toString(36) + Math.random().toString(36).slice(2, 6),
        item: item,
        date: editingDate,
        value: v
      })
      savedCount++
    })

    app.saveData()
    this.setData({ showEditModal: false, editingDate: "", editValues: {} }, function () {
      that.refreshData()
      wx.showToast({ title: "已保存 " + savedCount + " 项", icon: "success", duration: 1500 })
    })
  },

  cancelEdit: function () {
    this.setData({ showEditModal: false, editingDate: "", editValues: {} })
  },

  formatDate: function (d, mode) {
    var y = d.getFullYear()
    var m = String(d.getMonth() + 1)
    if (m.length === 1) m = "0" + m
    var day = String(d.getDate())
    if (day.length === 1) day = "0" + day
    if (mode === "year") return String(y)
    if (mode === "month") return y + "-" + m
    return y + "-" + m + "-" + day
  }
})