export class List<Item> extends Array<Item>
{
  /** 返回符合条件的第一个元素 */
  first(fn: (item: Item) => boolean): Item
  {
    if (this.length == 0)
      return null
    for (const item of this)
    {
      if (fn(item))
        return item
    }
    return null
  }

  /** 返回符合条件的最后一元素 */
  last(fn: (t: Item) => boolean): Item
  {
    if (this.length == 0)
      return null
    for (let i = this.length - 1; i >= 0; i--)
    {
      if (fn(this[i]))
        return this[i]
    }
    return null
  }

  /** 最大值 */
  max<T>(fn: (item: Item) => T): T
  {
    let maxV: T
    for (const i of this)
    {
      let v = fn(i)
      if (maxV == null)
      {
        maxV = fn(i)
      }
      else
      {
        if (v > maxV)
        {
          maxV = v
        }
      }
    }
    return maxV
  }

  /** 最小值 */
  min<T>(fn: (item: Item) => T): T
  {
    let minV: T
    for (const i of this)
    {
      let v = fn(i)
      if (minV == null)
      {
        minV = fn(i)
      }
      else
      {
        if (v < minV)
        {
          minV = v
        }
      }
    }
    return minV
  }

  /** 累加 */
  sum(fn: (item: Item) => number): number
  {
    let v: number = 0
    for (const t of this)
    {
      v = v + fn(t)
    }
    return v
  }

  /** 平均值 */
  avg(fn: (item: Item) => number): number
  {
    if (this.length == 0)
      return 0
    let sum = this.sum(fn)
    return sum / this.length
  }

  /** 满足条件的元素数量 */
  count(fn: (item: Item) => number): number
  {
    if (this.length == 0)
      return 0
    let c = 0
    for (const item of this)
    {
      if (fn(item))
        c = c + 1
    }
    return c
  }

  FindMax<T>(fn: (item: Item) => T): Item
  {
    return this.reduce((a: Item, b: Item): Item => fn(a) > fn(b) ? a : b)
  }
}

export class ArrayExt
{
  /** 返回满足条件的元素数量 */
  static count<Item>(list: Item[], fn: (item: Item) => boolean): number
  {
    if (list.length == 0)
      return 0
    let c = 0
    for (const item of list)
    {
      if (fn(item))
        c = c + 1
    }
    return c
  }

  /** 移除 */
  static remove<Item>(list: Item[], obj: Item)
  {
    let index = list.findIndex(t => t == obj)
    if (index == -1)
      return
    list.splice(index, 1)
  }

  /** 返回符合条件的第一个元素 */
  static first<Item>(list: Item[], fn: (item: Item) => boolean, orderFn1: (item: Item) => number = null, orderFn2: (item: Item) => number = null): Item
  {
    if (list.length == 0)
      return null
    if (orderFn1 == null)
    {
      for (const item of list)
      {
        if (fn(item))
          return item
      }
      return null
    }

    let minValue1: number
    let minValue2: number
    let minItem: Item
    for (const item of list)
    {
      if (fn(item) == false)
        continue
      let v1 = orderFn1(item)
      let v2 = orderFn2 != null ? orderFn2(item) : 0
      if (minValue1 == null || v1 < minValue1 || (v1 == minValue1 && v2 < minValue2))
      {
        minValue1 = v1
        minValue2 = v2
        minItem = item
      }
    }
    return minItem
  }

  /** 返回符合条件的最后一元素 */
  static last<Item>(list: Item[], fn: (t: Item) => boolean, orderFn1: (item: Item) => number = null, orderFn2: (item: Item) => number = null): Item
  {
    if (list.length == 0)
      return null
    if (orderFn1 == null)
    {
      for (let i = list.length - 1; i >= 0; i--)
      {
        if (fn(list[i]))
          return list[i]
      }
      return null
    }

    //
    let maxValue1: number
    let maxValue2: number
    let maxItem: Item
    for (const item of list)
    {
      if (fn(item) == false)
        continue
      let v1 = orderFn1(item)
      let v2 = orderFn2 ? orderFn2(item) : 0
      if (maxValue1 == null || v1 > maxValue1 || (v1 == maxValue1 && v2 > maxValue2))
      {
        maxValue1 = v1
        maxValue2 = v2
        maxItem = item
      }
    }
    return maxItem
  }

  /** 取最大值 */
  static max<T1, T2>(list: T1[], fn: (item: T1) => T2, whereF: (item: T1) => boolean = null, defaultV: T2 = null): T2
  {
    let maxV: T2
    for (const i of list)
    {
      if (whereF && whereF(i) == false)
        continue
      let v = fn(i)
      if (maxV == undefined)
      {
        maxV = fn(i)
      }
      else
      {
        if (v > maxV)
        {
          maxV = v
        }
      }
    }
    if (maxV != undefined)
      return maxV
    return defaultV
  }

  /** 最小值 */
  static min<Item, T>(list: Item[], fn: (item: Item) => T, whereF: (item: Item) => boolean = null, defaultV: T = null): T
  {
    let minV: T
    for (const i of list)
    {
      if (whereF && whereF(i) == false)
        continue
      let v = fn(i)
      if (minV == undefined)
      {
        minV = v
      }
      else
      {
        if (v < minV)
        {
          minV = v
        }
      }
    }
    if (minV != undefined)
      return minV
    return defaultV
  }

  /** 累加 */
  static sum<Item>(list: Item[], fn: (item: Item) => number, wn?: (item: Item) => boolean): number
  {
    let v: number = 0
    for (const t of list)
    {
      if (wn && wn(t) == false)
        continue
      v = v + fn(t)
    }
    return v
  }

  /** 平均值 */
  static avg<Item>(list: Item[], fn: (item: Item) => number): number
  {
    if (this.length == 0)
      return 0
    let sum = ArrayExt.sum(list, fn)
    return sum / this.length
  }

  /** 排序 */
  static sortBy<Item>(list: Item[], fn: (item: Item) => number, fn2: (item: Item) => number = null)
  {
    if (fn2 == null)
      return list.sort((a: Item, b: Item): number => fn(a) - fn(b))
    else
      return list.sort((a: Item, b: Item): number => fn(a) == fn(b) ? (fn2(a) - fn2(b)) : fn(a) - fn(b))
  }

  /** 降序 排序 */
  static sortByDescending<Item>(list: Item[], fn: (item: Item) => number)
  {
    list.sort((a: Item, b: Item): number => fn(b) - fn(a))
  }

  /** 排序成新的数组 */
  static orderBy<Item>(list: Item[], fn: (item: Item) => number, fn2: (item: Item) => number = null): Item[]
  {
    let newList = list.concat([])
    if (fn2 == null)
      return newList.sort((a: Item, b: Item): number => fn(a) - fn(b))
    else
      return newList.sort((a: Item, b: Item): number => fn(a) == fn(b) ? (fn2(a) - fn2(b)) : fn(a) - fn(b))
  }

  /** 降序成新的数组 */
  static orderByDescending<Item>(list: Item[], fn: (item: Item) => number, fn2: (item: Item) => number = null): Item[]
  {
    let newList = list.concat([])
    if (fn2 == null)
      return list.sort((a: Item, b: Item): number => fn(b) - fn(a))
    else
      return list.sort((a: Item, b: Item): number => fn(a) == fn(b) ? (fn2(b) - fn2(a)) : fn(b) - fn(a))
  }

  /** 分组 */
  static groupBy<Item, gT>(list: Item[], fn: (item: Item) => gT): GroupItem<gT, Item>[]
  {
    let groups = new Array<GroupItem<gT, Item>>()

    for (const item of list)
    {
      let key = fn(item)
      let group = groups.find(t => t.key == key)
      if (group == null)
      {
        group = new GroupItem(key)
        groups.push(group)
      }
      group.push(item)
    }
    return groups
  }

  /**
   * 选择
   * let newObjectList = ArrayExt.Select(list,t=>({pA:t.name, pB:t.age + "_"+ t.month}) ) ;
   */
  static Select<Item, rT>(list: Item[], fn: (item: Item) => rT): rT[]
  {
    let newList = new Array<rT>()
    for (const t of list)
    {
      newList.push(fn(t))
    }
    return newList
  }

  /** 过来,并按顺序排序 */
  static where<Item>(list: Item[], whereFn: (item: Item) => boolean, orderfn1: (item: Item) => number = null, orderfn2: (item: Item) => number = null): Item[]
  {
    let newList = list.filter(whereFn)
    if (orderfn1 == null && orderfn2 == null)
      return newList
    return ArrayExt.sortBy(newList, orderfn1, orderfn2)
  }
}

export class GroupItem<gT, Item>
{
  key: gT
  get count() { return this.list.length }
  list: Item[]

  constructor(k: gT)
  {
    this.key = k
    this.list = []
  }

  push(d: Item)
  {
    this.list.push(d)
  }
}

/**
 * 对排序好的数组进行去重操作
 * @param {(e1, e2) => boolean} [checkFuction] 校验对象相等函数
 * @returns {Array<T>} 返回自身
 */
export function arrayRemoveDuplicateBySort<T>(arr: Array<T>, checkFuction: (e1: T, e2: T) => boolean = checkEqual): Array<T>
{
  if (arr.length < 2)
    return arr
  let j = 1
  for (let i = 1, l = arr.length; i < l; i++)
    if (!checkFuction(arr[j - 1], arr[i]))
      arr[j++] = arr[i]
  arr.length = j
  return arr
}