import Clipboard from 'clipboard'

export function isNull(value) {
  return (value === null) || (value === undefined);
}

export function isNotNull(value) {
  return (value !== null) && (value !== undefined);
}

export function isEmptyStr(str) {
  //return (str === undefined) || (!str) || (!/[^\s]/.test(str));
  return (str === undefined) || (!str && (str !== 0) && (str !== '0')) || (!/[^\s]/.test(str));
}

export const generateId = function() {
  return Math.floor(Math.random() * 100000 + Math.random() * 20000 + Math.random() * 5000);
};

export const deepClone = function (origin) {
  if (origin === undefined) {
    return undefined
  }

  return JSON.parse(JSON.stringify(origin))
}

export const overwriteObj = function(obj1, obj2) {  /* 浅拷贝对象属性，obj2覆盖obj1 */
  // for (let prop in obj2) {
  //   if (obj2.hasOwnProperty(prop)) {
  //     obj1[prop] = obj2[prop]
  //   }
  // }

  Object.keys(obj2).forEach(prop => {
    obj1[prop] = obj2[prop]
  })
}

export const addWindowResizeHandler = function (handler) {
  let oldHandler = window.onresize
  if (typeof window.onresize != 'function') {
    window.onresize = handler
  } else {
    window.onresize = function () {
      oldHandler()
      handler()
    }
  }
}

const createStyleSheet = function() {
  let head = document.head || document.getElementsByTagName('head')[0];
  let style = document.createElement('style');
  style.type = 'text/css';
  head.appendChild(style);
  return style.sheet;
}

export const insertCustomCssToHead = function (cssCode) {
  let head = document.getElementsByTagName('head')[0]
  let oldStyle = document.getElementById('vform-custom-css')
  if (!!oldStyle) {
    head.removeChild(oldStyle)  //应该先清除后插入！！
  }

  let newStyle = document.createElement('style')
  newStyle.type = 'text/css'
  newStyle.rel = 'stylesheet'
  newStyle.id = 'vform-custom-css'
  try {
    newStyle.appendChild(document.createTextNode(cssCode))
  } catch(ex) {
    newStyle.styleSheet.cssText = cssCode
  }

  head.appendChild(newStyle)
}

export const insertGlobalFunctionsToHtml = function (functionsCode) {
  let bodyEle = document.getElementsByTagName('body')[0]
  let oldScriptEle = document.getElementById('v_form_global_functions')
  !!oldScriptEle && bodyEle.removeChild(oldScriptEle)

  let newScriptEle = document.createElement('script')
  newScriptEle.id = 'v_form_global_functions'
  newScriptEle.type = 'text/javascript'
  newScriptEle.innerHTML = functionsCode
  bodyEle.appendChild(newScriptEle)
}

export const optionExists = function(optionsObj, optionName) {
  if (!optionsObj) {
    return false
  }

  return Object.keys(optionsObj).indexOf(optionName) > -1
}

export const loadRemoteScript = function(srcPath, callback) {  /*加载远程js，加载成功后执行回调函数*/
  let sid = encodeURIComponent(srcPath)
  let oldScriptEle = document.getElementById(sid)

  if (!oldScriptEle) {
    let s = document.createElement('script')
    s.src = srcPath
    s.id = sid
    document.body.appendChild(s)

    s.onload = s.onreadystatechange = function (_, isAbort) { /* 借鉴自ace.js */
      if (isAbort || !s.readyState || s.readyState === "loaded" || s.readyState === "complete") {
        s = s.onload = s.onreadystatechange = null
        if (!isAbort) {
          callback()
        }
      }
    }
  }
}

export function traverseFieldWidgets(widgetList, handler) {
  widgetList.map(w => {
    if (w.formItemFlag) {
      handler(w)
    } else if (w.type === 'grid') {
      w.cols.map(col => {
        traverseFieldWidgets(col.widgetList, handler)
      })
    } else if (w.type === 'table') {
      w.rows.map(row => {
        row.cols.map(cell => {
          traverseFieldWidgets(cell.widgetList, handler)
        })
      })
    } else if (w.type === 'tab') {
      w.tabs.map(tab => {
        traverseFieldWidgets(tab.widgetList, handler)
      })
    } else if (w.type === 'sub-form') {
      traverseFieldWidgets(w.widgetList, handler)
    } else if (w.category === 'container') {  //自定义容器
      traverseFieldWidgets(w.widgetList, handler)
    }
  })
}

export function traverseContainWidgets(widgetList, handler) {
  widgetList.map(w => {
    if (w.category === 'container') {
      handler(w)
    }

    if (w.type === 'grid') {
      w.cols.map(col => {
        traverseContainWidgets(col.widgetList, handler)
      })
    } else if (w.type === 'table') {
      w.rows.map(row => {
        row.cols.map(cell => {
          traverseContainWidgets(cell.widgetList, handler)
        })
      })
    } else if (w.type === 'tab') {
      w.tabs.map(tab => {
        traverseContainWidgets(tab.widgetList, handler)
      })
    } else if (w.type === 'sub-form') {
      traverseContainWidgets(w.widgetList, handler)
    } else if (w.category === 'container') {  //自定义容器
      traverseContainWidgets(w.widgetList, handler)
    }
  })
}

export function copyToClipboard(content, clickEvent, $message, successMsg, errorMsg) {
  const clipboard = new Clipboard(clickEvent.target, {
    text: () => content
  })

  clipboard.on('success', () => {
    $message.success(successMsg)
    clipboard.destroy()
  })

  clipboard.on('error', () => {
    $message.error(errorMsg)
    clipboard.destroy()
  })

  clipboard.onClick(clickEvent)
}

export function getQueryParam(variable) {
  let query = window.location.search.substring(1);
  let vars = query.split("&")
  for (let i=0; i<vars.length; i++) {
    let pair = vars[i].split("=")
    if(pair[0] == variable) {
      return pair[1]
    }
  }

  return undefined;
}