import React from 'react';
import {Component} from 'react';
import Box from '../../components/UI/Box/Box';
import Button from '../../components/UI/Button/Button';
import CSSModules from 'react-css-modules';
import styles from './MountItems.css';
import Modal from '../../components/UI/Modal/Modal';
import MountItem from '../../components/MountItem/MountItem';
import RootElem from '../../hoc/RootElem/RootElem';

const Constants = require('../../constants');

let ipcRenderer = null;
if (!process.versions.hasOwnProperty('electron')) {
  ipcRenderer = ((window && window.require) ? window.require('electron').ipcRenderer : null);
}

class MountItems extends Component {
  constructor(props) {
    super(props);
    for (const provider of Constants.PROVIDER_LIST) {
      this.state[provider] = {
        AllowMount: false,
        DriveLetters: [],
        Mounted: false,
      };
    }
    if (ipcRenderer) {
      ipcRenderer.on(Constants.IPC_Detect_Mounts_Reply, this.onDetectMountsReply);
      ipcRenderer.on(Constants.IPC_Mount_Drive_Reply, this.onMountDriveReply);
      ipcRenderer.on(Constants.IPC_Unmount_Drive_Reply, this.onUnmountDriveReply);

      this.detectMounts();
    }
  }

  retryIntervals = {};

  state = {
    DisplayRetry: false,
    RetryItems: {},
  };

  cancelRetryMount = (storageType, stateCallback) => {
    clearInterval(this.retryIntervals[storageType]);
    delete this.retryIntervals[storageType];

    if (stateCallback) {
      let retryItems = {
        ...this.state.RetryItems,
      };
      delete retryItems[storageType];
      this.setState({
        DisplayRetry: Object.keys(retryItems).length > 0,
        RetryItems: retryItems,
      }, stateCallback);
    }
  };

  componentWillUnmount = () => {
    for (const storageType in this.state.RetryItems) {
      if (this.state.RetryItems.hasOwnProperty(storageType)) {
        this.cancelRetryMount(storageType);
      }
    }

    if (ipcRenderer) {
      ipcRenderer.removeListener(Constants.IPC_Detect_Mounts_Reply, this.onDetectMountsReply);
      ipcRenderer.removeListener(Constants.IPC_Mount_Drive_Reply, this.onMountDriveReply);
      ipcRenderer.removeListener(Constants.IPC_Unmount_Drive_Reply, this.onUnmountDriveReply);
    }
  };

  detectMounts = ()=> {
    this.props.mountsBusy(true);
    ipcRenderer.send(Constants.IPC_Detect_Mounts, {
      Directory: this.props.directory,
      Version: this.props.version,
    });
  };

  handleMountLocationChanged = (storageType, value) => {
    if (this.props.platform === 'win32') {
      this.props.changed(storageType, this.state[storageType].DriveLetters[value]);
    }
    else {
      this.props.changed(storageType, value);
    }
  };

  handleMountUnMount = (storageType, mount, location) => {
    if (!location || (location.trim().length === 0)) {
      this.props.errorHandler('Mount location is not set');
    } else {
      if (ipcRenderer) {
        let allowAction = true;
        if (mount && (this.props.platform !== 'win32')) {
          const result = ipcRenderer.sendSync(Constants.IPC_Check_Mount_Location, {
            Location: location,
          });
          if (!result.Success) {
            allowAction = false;
            this.props.errorHandler(result.Error.toString());
          }
        }

        if (allowAction) {
          const state = {
            ...this.state[storageType],
            AllowMount: false,
          };

          this.props.mountsBusy(true);

          this.setState({
            [storageType]: state,
          }, () => {
            if (mount) {
              ipcRenderer.send(Constants.IPC_Mount_Drive, {
                Directory: this.props.directory,
                Location: location,
                NoConsoleSupported: this.props.noConsoleSupported,
                StorageType: storageType,
                Version: this.props.version,
              });
            } else {
              ipcRenderer.send(Constants.IPC_Unmount_Drive, {
                Directory: this.props.directory,
                Location: location,
                StorageType: storageType,
                Version: this.props.version,
              });
            }
          });
        }
      }
    }
  };

  onDetectMountsReply = (event, arg) => {
    if (arg.data.Success) {
      let state = {};
      let mountsBusy = false;
      for (const provider of Constants.PROVIDER_LIST) {
        state[provider] = {
          ...this.state[provider],
          AllowMount: true,
          DriveLetters: (arg.data.DriveLetters[provider]),
          Mounted: (arg.data.Locations[provider].length > 0),
        };
        mountsBusy = mountsBusy || state[provider].Mounted;
      }
      this.props.mountsBusy(mountsBusy);

      this.setState(state, () => {
        const updateMountLocation = (data, provider) => {
          const providerLower = provider.toLowerCase();
          let location = data.Locations[provider];
          if (location.length === 0) {
            location = (this.props.platform === 'win32') ?
              this.props[providerLower].MountLocation || data.DriveLetters[provider][0] :
              this.props[providerLower].MountLocation;
          }
          if (location !== this.props[providerLower].MountLocation) {
            this.props.changed(provider, location);
          }
        };
        
        for (const provider of Constants.PROVIDER_LIST) {
          updateMountLocation(arg.data, provider);
        }

        this.performAutoMount();
      });
    } else {
      this.props.errorHandler(arg.data.Error);
    }
  };

  onMountDriveReply = (event, arg) => {
    const state = {
      ...this.state[arg.data.StorageType],
      Mounted: arg.data.Success,
    };
    this.setState({
      [arg.data.StorageType]: state,
    }, ()=> {
      this.detectMounts();
    });
  };

  onUnmountDriveReply = (event, arg) => {
    if (arg && arg.data && !arg.data.Expected && arg.data.Location && this.props[arg.data.StorageType.toLowerCase()].AutoRestart) {
      const storageType = arg.data.StorageType;
      if (!this.state.RetryItems[storageType]) {
        let retryItems = {
          ...this.state.RetryItems
        };
        retryItems[storageType] = {
          RetrySeconds: 10,
        };
        this.setState({
          DisplayRetry: true,
          RetryItems: retryItems,
        }, () => {
          this.retryIntervals[storageType] = setInterval(() => {
            let retryItems = {
              ...this.state.RetryItems,
            };
            const retrySeconds = retryItems[storageType].RetrySeconds - 1;
            if (retrySeconds === 0) {
              this.cancelRetryMount(storageType, () => {
                this.handleMountUnMount(storageType, true, arg.data.Location);
              });
            } else {
              retryItems[storageType].RetrySeconds = retrySeconds;
              this.setState({
                RetryItems: retryItems,
              });
            }
          },1000);
        });
      }
    } else {
      this.detectMounts();
    }
  };

  performAutoMount = ()=> {
    if (this.props.processAutoMount) {
      this.props.autoMountProcessed();
      const processAutoMount = (provider) => {
        const providerLower = provider.toLowerCase();
        if (this.props[providerLower].AutoMount &&
          !this.state[provider].Mounted &&
          (this.props[providerLower].MountLocation.length > 0)) {
          this.handleMountUnMount(provider, true, this.props[providerLower].MountLocation);
        }
      };

      for (const provider of Constants.PROVIDER_LIST) {
        processAutoMount(provider);
      }
    }
  };

  render() {
    let retryDisplay;
    if (this.state.DisplayRetry) {
      let retryList = [];
      for (const storageType in this.state.RetryItems) {
        if (this.state.RetryItems.hasOwnProperty(storageType)) {
          retryList.push((
            <RootElem key={retryList.length}>
              <p>Retrying {storageType} in {this.state.RetryItems[storageType].RetrySeconds}(s)</p>
              <Button clicked={()=>this.cancelRetryMount(storageType, ()=> this.detectMounts())}>Cancel {storageType}</Button>
            </RootElem>
          ));
        }
      }

      retryDisplay = (
        <Modal>
          <Box dxStyle={{padding: '8px', minWidth: '60vw'}}>
            <h1 style={{textAlign: 'center'}}>Mount Failed</h1>
            {retryList}
          </Box>
        </Modal>
      )
    }

    let items = [];
    for (const provider of Constants.PROVIDER_LIST) {
      const providerLower = provider.toLowerCase();
      items.push((
        <MountItem allowConfig={this.props.allowConfig}
                   allowMount={this.state[provider].AllowMount}
                   autoMount={this.props[providerLower].AutoMount}
                   autoMountChanged={(e)=>this.props.autoMountChanged(provider, e)}
                   autoRestart={this.props[providerLower].AutoRestart}
                   autoRestartChanged={(e)=>this.props.autoRestartChanged(provider, e)}
                   changed={(e) => this.handleMountLocationChanged(provider, e.target.value)}
                   clicked={this.handleMountUnMount}
                   configClicked={()=>this.props.configClicked(provider)}
                   items={this.state[provider].DriveLetters}
                   key={'mi_' + items.length}
                   location={this.props[providerLower].MountLocation}
                   mounted={this.state[provider].Mounted}
                   platform={this.props.platform}
                   title={provider} />
      ));
      if (items.length !== this.state.length) {
        items.push(<div key={'di_' + items.length}
                        style={{paddingTop: '12px'}} />)
      }
    }
    
    return (
      <div styleName='MountItems'>
        {retryDisplay}
        {items}
      </div>);
  }
}

export default CSSModules(MountItems, styles, {allowMultiple: true});