export function formatJson(json) {
  let i = 0
  let il = 0
  const tab = '    '
  let newJson = ''
  let indentLevel = 0
  let inString = false
  let currentChar = null
  let flag = false
  for (i = 0, il = json.length; i < il; i += 1) {
    currentChar = json.charAt(i)
    switch (currentChar) {
      case '{':
        if (i != 0 && json.charAt(i - 1) === '$') {
          newJson += currentChar
          flag = true
        } else if (!inString) {
          newJson += currentChar + '\n' + repeat(tab, indentLevel + 1)
          indentLevel += 1
        } else {
          newJson += currentChar
        }
        break
      case '[':
        if (!inString) {
          newJson += currentChar + '\n' + repeat(tab, indentLevel + 1)
          indentLevel += 1
        } else {
          newJson += currentChar
        }
        break
      case '}':
        if (flag) {
          newJson += currentChar
          flag = false
        } else if (!inString) {
          indentLevel -= 1
          newJson += '\n' + repeat(tab, indentLevel) + currentChar
        } else {
          newJson += currentChar
        }
        break
      case ']':
        if (!inString) {
          indentLevel -= 1
          newJson += '\n' + repeat(tab, indentLevel) + currentChar
        } else {
          newJson += currentChar
        }
        break
      case ',':
        if (!inString) {
          newJson += ',\n' + repeat(tab, indentLevel)
        } else {
          newJson += currentChar
        }
        break
      case ':':
        if (!inString) {
          newJson += ': '
        } else {
          newJson += currentChar
        }
        break
      case ' ':
      case '\n':
      case '\t':
        if (inString) {
          newJson += currentChar
        }
        break
      case '"':
        if (i > 0 && json.charAt(i - 1) !== '\\') {
          inString = !inString
        }
        newJson += currentChar
        break
      default:
        newJson += currentChar
        break
    }
  }
  return newJson
}

function repeat(s, count) {
  return new Array(count + 1).join(s)
}

export function formatXml(text) {
  // 去掉多余的空格
  text = '\n' + text.replace(/(<\w+)(\s.*?>)/g, function($0, name, props) {
    return name + ' ' + props.replace(/\s+(\w+=)/g, ' $1')
  })
  // 把注释编码
  text = text.replace(/<!--(.+?)-->/g, function($0, text) {
    var ret = '<!--' + escape(text) + '-->'
    return ret
  })
  // 调整格式
  var rgx = /\n(<(([^\?]).+?)(?:\s|\s*?>|\s*?(\/)>)(?:.*?(?:(?:(\/)>)|(?:<(\/)\2>)))?)/mg
  var nodeStack = []
  var output = text.replace(rgx, function($0, all, name, isBegin, isCloseFull1, isCloseFull2, isFull1, isFull2) {
    var isClosed = (isCloseFull1 == '/') || (isCloseFull2 == '/') || (isFull1 == '/') || (isFull2 == '/')
    var prefix = ''
    if (isBegin == '!') {
      prefix = getPrefix(nodeStack.length)
    } else {
      if (isBegin != '/') {
        prefix = getPrefix(nodeStack.length)
        if (!isClosed) {
          nodeStack.push(name)
        }
      } else {
        nodeStack.pop()
        prefix = getPrefix(nodeStack.length)
      }
    }
    var ret = '\n' + prefix + all
    return ret
  })
  var prefixSpace = -1
  var outputText = output.substring(1)
  // 把注释还原并解码，调格式
  outputText = outputText.replace(/(\s*)<!--(.+?)-->/g, function($0, prefix, text) {
    if (prefix.charAt(0) == '\r') { prefix = prefix.substring(1) }
    text = unescape(text).replace(/\r/g, '\n')
    var ret = '\n' + prefix + '<!--' + text.replace(/^\s*/mg, prefix) + '-->'
    return ret
  })
  return outputText.replace(/\s+$/g, '').replace(/\r/g, '\r\n')
}

/**
 * @param time 时间
 * @param cFormat 格式
 * @returns {string|null} 字符串
 * @example formatTime('2018-1-29', '{y}/{m}/{d} {h}:{i}:{s}') // -> 2018/01/29 00:00:00
 */
export function formatTime(time, cFormat) {
  if (arguments.length === 0) return null
  if ((time + '').length === 10) {
    time = +time * 1000
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'; let date
  if (typeof time === 'object') {
    date = time
  } else {
    date = new Date(time)
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  return format.replace(/{([ymdhisa])+}/g, (result, key) => {
    let value = formatObj[key]
    if (key === 'a') return ['一', '二', '三', '四', '五', '六', '日'][value - 1]
    if (result.length > 0 && value < 10) {
      value = '0' + value
    }
    return value || 0
  })
}

function getPrefix(prefixIndex) {
  var span = ' '
  var output = []
  for (var i = 0; i < prefixIndex; ++i) {
    output.push(span)
  }
  return output.join('')
}