/**
 * @description 缓存工具类
 */
export default class CacheUtils {
  /**
   * @description 打开websql
   */
  static openWebSql (db) {
    try {
      window.GLOB.WebSql = openDatabase(db, '1', 'mk-pc-database', 50 * 1024 * 1024)
      window.GLOB.WebSql.transaction(tx => {
        tx.executeSql('CREATE TABLE IF NOT EXISTS VERSIONS (version varchar(50), createDate varchar(50), CDefine1 varchar(50), CDefine2 varchar(50), CDefine3 varchar(50))', [], () => {
        
        }, () => {
          // eslint-disable-next-line
          throw 'CREATE TABLE ERROR'
        })
        tx.executeSql('CREATE TABLE IF NOT EXISTS CONFIGS (menuid varchar(50), userid varchar(50), openEdition varchar(50), webEdition varchar(50), LongParam text, LongParamUser text, CDefine1 varchar(50), CDefine2 varchar(50), CDefine3 varchar(50), CDefine4 varchar(50), CDefine5 varchar(50))', [], () => {

        }, () => {
          // eslint-disable-next-line
          throw 'CREATE TABLE ERROR'
        })

        if (window.GLOB.systemType === '') {
          tx.executeSql('CREATE TABLE IF NOT EXISTS FUNCS (func_code varchar(50), key_sql text, CDefine1 varchar(50), CDefine2 varchar(50), CDefine3 varchar(50))', [], () => {

          }, () => {
            // eslint-disable-next-line
            throw 'CREATE TABLE ERROR'
          })
        }
      })
      // window.GLOB.WebSql.transaction(tx => {
      //   tx.executeSql('DROP TABLE VERSIONS')
      //   tx.executeSql('DROP TABLE CONFIGS')
      // })
    } catch (e) {
      console.warn('WebSql 初始化失败！')
      window.GLOB.WebSql = null
    }
  }

  /**
   * @description 清空函数
   */
  static clearFuncs () {
    if (window.GLOB.systemType !== '') return

    if (window.GLOB.WebSql) {
      window.GLOB.WebSql.transaction(tx => {
        tx.executeSql('DELETE FROM FUNCS')

        tx.executeSql(`UPDATE VERSIONS SET createDate='1970-01-01 14:59:09.000' where CDefine1='funcs'`)
      })
    } else if (window.GLOB.IndexDB) {
      let objectStore = window.GLOB.IndexDB.transaction(['funcs'], 'readwrite').objectStore('funcs')
      objectStore.clear()

      window.GLOB.IndexDB.transaction(['version'], 'readwrite').objectStore('version').delete('funcs')
    }
  }

  /**
   * @description 获取websql中保存信息版本
   */
  static getWebSqlVersion () {
    if (!window.GLOB.WebSql) {
      return Promise.reject()
    }

    let deffers = []

    deffers.push(
      new Promise((resolve) => {
        window.GLOB.WebSql.transaction(tx => {
          tx.executeSql("SELECT * FROM VERSIONS where CDefine1='LongParam'", [], (tx, results) => {
            if (results.rows[0]) {
              resolve(results.rows[0])
            } else {
              resolve({version: '', createDate: ''})
            }
          }, (tx, results) => {
            window.GLOB.WebSql = null
            console.warn(results)
            resolve({version: '', createDate: ''})
          })
        })
      })
    )

    deffers.push(
      new Promise((resolve) => {
        window.GLOB.WebSql.transaction(tx => {
          tx.executeSql(`SELECT * FROM CONFIGS`, [], (tx, results) => {
            let menus = []
            for (let i = 0; i < results.rows.length; i++) {
              menus.push(`'${results.rows[i].menuid}','${results.rows[i].openEdition || 'mk'}'`)
            }
            resolve(menus)
          }, (tx, results) => {
            window.GLOB.WebSql = null
            console.warn(results)
            resolve([])
          })
        })
      })
    )

    return new Promise((resolve) => {
      Promise.all(deffers).then(res => {
        let result = res[0]

        if (result.createDate && !/^\d{4}-\d{2}-\d{2}/.test(result.createDate)) {
          result.createDate = ''
        }

        result.menuids = res[1].join(';')

        resolve(result)
      })
    })
  }

  /**
   * @description 删除websql中保存的配置信息
   */
  static delWebSqlConfig (keys) {
    if (!window.GLOB.WebSql) return

    if (!keys) {
      window.GLOB.WebSql.transaction(tx => {
        tx.executeSql(`DELETE FROM CONFIGS`, [], () => {}, () => { window.GLOB.WebSql = null })
      })
    } else {
      window.GLOB.WebSql.transaction(tx => {
        tx.executeSql(`DELETE FROM CONFIGS where menuid in (${keys})`, [], () => {}, () => {
          window.GLOB.WebSql = null
        })
      })
    }
  }

  /**
   * @description 删除websql中保存的配置信息
   */
  static delMenuWebSqlConfig (menuId) {
    if (!window.GLOB.WebSql || !menuId) return Promise.resolve()
    return new Promise(resolve => {
      window.GLOB.WebSql.transaction(tx => {
        tx.executeSql(`DELETE FROM CONFIGS where menuid='${menuId}'`, [], () => {
          resolve()
        }, () => {
          window.GLOB.WebSql = null
          resolve()
        })
      })
    })
  }

  /**
   * @description 更新websql中配置信息的版本
   */
  static updateWebSqlversion (version, curTime) {
    if (!window.GLOB.WebSql) return

    window.GLOB.WebSql.transaction(tx => {
      tx.executeSql(`DELETE FROM VERSIONS where CDefine1='LongParam'`)

      if (version) {
        tx.executeSql('INSERT INTO VERSIONS (version, createDate, CDefine1) VALUES (?, ?, ?)', [version, curTime, 'LongParam'], () => {}, () => {
          window.GLOB.WebSql = null
        })
      }
    })
  }

  /**
   * @description 获取websql中的配置信息
   */
  static getWebSqlMenuConfig (MenuID, userid) {
    if (!window.GLOB.WebSql || !MenuID || !userid) return Promise.reject()
    return new Promise((resolve, reject) => {
      window.GLOB.WebSql.transaction(tx => {
        tx.executeSql(`SELECT * FROM CONFIGS WHERE menuid='${MenuID}' and userid='${userid}'`, [], (tx, results) => {
          let paramItem = results.rows[0]
          if (paramItem) {
            resolve({
              ErrCode: 'S',
              ErrMesg: '',
              LongParam: paramItem.LongParam,
              LongParamUser: paramItem.LongParamUser,
              message: '',
              open_edition: paramItem.openEdition,
              status: true,
              web_edition: paramItem.webEdition
            })
          } else {
            reject()
          }
        }, (tx, results) => {
          window.GLOB.WebSql = null
          console.warn(results)
          reject()
        })
      })
    })
  }

  /**
   * @description 将数据写入websql
   */
  static writeInWebSql (data) {
    if (!window.GLOB.WebSql || !data) return
    window.GLOB.WebSql.transaction(tx => {
      tx.executeSql('INSERT INTO CONFIGS (menuid, userid, openEdition, webEdition, LongParam, LongParamUser) VALUES (?, ?, ?, ?, ?, ?)', data)
    })
  }

  /**
   * @description 打开IndexedDB
   */
  static openIndexDB (db) {
    try {
      let request = window.indexedDB.open(db, 1)
      request.onerror = () => {
        console.warn('IndexedDB 初始化失败！')
      }
      request.onsuccess = () => {
        window.GLOB.IndexDB = request.result
      }
      request.onupgradeneeded = (event) => {
        window.GLOB.IndexDB = event.target.result
        if (!window.GLOB.IndexDB.objectStoreNames.contains('version')) {
          window.GLOB.IndexDB.createObjectStore('version', { keyPath: 'id' })
        }
        if (!window.GLOB.IndexDB.objectStoreNames.contains('configs')) {
          let objectStore = window.GLOB.IndexDB.createObjectStore('configs', { keyPath: 'id' })
          objectStore.createIndex('menuid', 'menuid', { unique: false })
          objectStore.createIndex('userid', 'userid', { unique: false })
        }
        if (window.GLOB.systemType === '' && !window.GLOB.IndexDB.objectStoreNames.contains('funcs')) {
          window.GLOB.IndexDB.createObjectStore('funcs', { keyPath: 'id' })
        }
      }
    } catch (e) {
      console.warn('IndexedDB 初始化失败！')
      window.GLOB.IndexDB = null
    }
  }

  /**
   * @description 获取IndexedDB中保存信息版本
   */
  static getIndexDBVersion () {
    if (!window.GLOB.IndexDB) {
      return Promise.reject()
    }

    let deffers = []

    deffers.push(
      new Promise((resolve) => {
        let request = window.GLOB.IndexDB.transaction(['version'])
          .objectStore('version')
          .get('mksoft')

        request.onerror = (event) => {
          window.GLOB.IndexDB = null
          console.warn(event)
          resolve({version: '', createDate: ''})
        }

        request.onsuccess = () => {
          if (request.result) {
            resolve(request.result)
          } else {
            resolve({version: '', createDate: ''})
          }
        }
      })
    )

    deffers.push(
      new Promise((resolve) => {
        let request = window.GLOB.IndexDB.transaction(['configs']).objectStore('configs').openCursor()
        let menus = []

        request.onerror = () => {
          window.GLOB.IndexDB = null
          resolve(menus)
        }

        request.onsuccess = (e) => {
          let cursor = e.target.result
          if (cursor) {
            menus.push(`'${cursor.value.menuid}','${cursor.value.open_edition || 'mk'}'`)
            cursor.continue()
          } else {
            resolve(menus)
          }
        }
      })
    )

    return new Promise((resolve) => {
      Promise.all(deffers).then(res => {
        let result = res[0]

        if (result.createDate && !/^\d{4}-\d{2}-\d{2}/.test(result.createDate)) {
          result.createDate = ''
        }

        result.menuids = res[1].join(';')

        resolve(result)
      })
    })
  }

  /**
   * @description 更新IndexedDB中配置信息的版本
   */
  static updateIndexDBversion (version) {
    if (!window.GLOB.IndexDB || !version) return

    if (!version) {
      let request = window.GLOB.IndexDB.transaction(['configs'], 'readwrite').objectStore('configs').delete('mksoft')
  
      request.onerror = () => {
        window.GLOB.IndexDB = null
      }
    } else {
      version.id = 'mksoft'

      let objectStore = window.GLOB.IndexDB.transaction(['version'], 'readwrite').objectStore('version')
      let request = objectStore.get('mksoft')
  
      request.onerror = () => {
        window.GLOB.IndexDB = null
      }
  
      request.onsuccess = () => {
        if (request.result) {
          let put = objectStore.put(version)
  
          put.onerror = () => {
            window.GLOB.IndexDB = null
          }
        } else {
          let add = objectStore.add(version)
  
          add.onerror = () => {
            window.GLOB.IndexDB = null
          }
        }
      }
    }
  }

  /**
   * @description 删除IndexedDB中保存的配置信息
   */
  static delMenuIndexDBConfig (key) {
    if (!window.GLOB.IndexDB || !key) return Promise.resolve()

    return new Promise(resolve => {
      let request = window.GLOB.IndexDB.transaction(['configs'], 'readwrite')
        .objectStore('configs')
        .delete(key)

      request.onsuccess = () => {
        resolve()
      }
      request.onerror = () => {
        window.GLOB.IndexDB = null
        resolve()
      }
    })
  }

  /**
   * @description 删除IndexedDB中保存的配置信息-批量
   */
  static delIndexDBConfig (menuids) {
    if (!window.GLOB.IndexDB) return

    if (!menuids) {
      let request = window.GLOB.IndexDB.transaction(['configs'], 'readwrite').objectStore('configs').clear()
  
      request.onerror = () => {
        window.GLOB.IndexDB = null
      }
    } else {
      let request = window.GLOB.IndexDB.transaction(['configs'], 'readwrite').objectStore('configs').openCursor()
  
      request.onerror = () => {
        window.GLOB.IndexDB = null
      }

      request.onsuccess = (e) => {
        let cursor = e.target.result
        if (cursor) {
          if (menuids.includes(cursor.value.menuid)) {
            cursor.delete()
          }
          cursor.continue()
        }
      }
    }
  }

  /**
   * @description 获取IndexedDB中的配置信息
   */
  static getIndexDBMenuConfig (MenuID, userid) {
    if (!window.GLOB.IndexDB || !MenuID || !userid) return Promise.reject()
    let key = MenuID + userid
    
    return new Promise((resolve, reject) => {
      let request = window.GLOB.IndexDB.transaction(['configs']).objectStore('configs').get(key)

      request.onerror = () => {
        window.GLOB.IndexDB = null
        reject()
      }

      request.onsuccess = () => {
        if (request.result) {
          resolve(request.result)
        } else {
          reject()
        }
      }
    })
  }

  /**
   * @description 将数据写入IndexedDB
   */
  static writeInIndexDB (data) {
    if (!window.GLOB.IndexDB || !data) return

    let request = window.GLOB.IndexDB.transaction(['configs'], 'readwrite')
      .objectStore('configs')
      .add(data)

    request.onerror = () => {
      window.GLOB.IndexDB = null
    }
  }
}