import * as React from 'react';
import { Component, Text, View } from 'reactxp';
import { sprintf } from 'sprintf-js';
import { BridgeState, RelayProtocol, TunnelProtocol } from '../../shared/daemon-rpc-types';
import { messages } from '../../shared/gettext';
import { WgKeyState } from '../redux/settings/reducers';
import styles, { InputFrame, TunnelProtocolSelector } from './AdvancedSettingsStyles';
import * as AppButton from './AppButton';
import * as Cell from './Cell';
import { Container, Layout } from './Layout';
import { ModalAlert, ModalAlertType, ModalContainer, ModalMessage } from './Modal';
import {
  BackBarItem,
  NavigationBar,
  NavigationContainer,
  NavigationItems,
  NavigationScrollbars,
  TitleBarItem,
} from './NavigationBar';
import Selector, { ISelectorItem } from './Selector';
import SettingsHeader, { HeaderTitle } from './SettingsHeader';

const MIN_MSSFIX_VALUE = 1000;
const MAX_MSSFIX_VALUE = 1450;
const MIN_WIREGUARD_MTU_VALUE = 1280;
const MAX_WIREGUARD_MTU_VALUE = 1420;
const UDP_PORTS = [1194, 1195, 1196, 1197, 1300, 1301, 1302];
const TCP_PORTS = [80, 443];
const WIREUGARD_UDP_PORTS = [53];

type OptionalPort = number | undefined;

type OptionalRelayProtocol = RelayProtocol | undefined;
type OptionalTunnelProtocol = TunnelProtocol | undefined;

function mapPortToSelectorItem(value: number): ISelectorItem<number> {
  return { label: value.toString(), value };
}

interface IProps {
  enableIpv6: boolean;
  blockWhenDisconnected: boolean;
  tunnelProtocol?: TunnelProtocol;
  openvpn: {
    protocol?: RelayProtocol;
    port?: number;
  };
  wireguardKeyState: WgKeyState;
  wireguard: { port?: number };
  mssfix?: number;
  wireguardMtu?: number;
  bridgeState: BridgeState;
  setBridgeState: (value: BridgeState) => void;
  setEnableIpv6: (value: boolean) => void;
  setBlockWhenDisconnected: (value: boolean) => void;
  setTunnelProtocol: (value: OptionalTunnelProtocol) => void;
  setOpenVpnMssfix: (value: number | undefined) => void;
  setWireguardMtu: (value: number | undefined) => void;
  setOpenVpnRelayProtocolAndPort: (protocol?: RelayProtocol, port?: number) => void;
  setWireguardRelayPort: (port?: number) => void;
  onViewWireguardKeys: () => void;
  onClose: () => void;
}

interface IState {
  showConfirmBlockWhenDisconnectedAlert: boolean;
}

export default class AdvancedSettings extends Component<IProps, IState> {
  private portItems: { [key in RelayProtocol]: Array<ISelectorItem<OptionalPort>> };
  private protocolItems: Array<ISelectorItem<OptionalRelayProtocol>>;
  private bridgeStateItems: Array<ISelectorItem<BridgeState>>;
  private wireguardPortItems: Array<ISelectorItem<OptionalPort>>;

  public state = {
    showConfirmBlockWhenDisconnectedAlert: false,
  };

  constructor(props: IProps) {
    super(props);

    const automaticPort: ISelectorItem<OptionalPort> = {
      label: messages.pgettext('advanced-settings-view', 'Automatic'),
      value: undefined,
    };

    this.portItems = {
      udp: [automaticPort].concat(UDP_PORTS.map(mapPortToSelectorItem)),
      tcp: [automaticPort].concat(TCP_PORTS.map(mapPortToSelectorItem)),
    };

    this.wireguardPortItems = [automaticPort].concat(
      WIREUGARD_UDP_PORTS.map(mapPortToSelectorItem),
    );

    this.protocolItems = [
      {
        label: messages.pgettext('advanced-settings-view', 'Automatic'),
        value: undefined,
      },
      {
        label: messages.pgettext('advanced-settings-view', 'TCP'),
        value: 'tcp',
      },
      {
        label: messages.pgettext('advanced-settings-view', 'UDP'),
        value: 'udp',
      },
    ];

    this.wireguardPortItems = [automaticPort].concat(
      WIREUGARD_UDP_PORTS.map(mapPortToSelectorItem),
    );

    this.bridgeStateItems = [
      {
        label: messages.pgettext('advanced-settings-view', 'Automatic'),
        value: 'auto',
      },
      {
        label: messages.pgettext('advanced-settings-view', 'On'),
        value: 'on',
      },
      {
        label: messages.pgettext('advanced-settings-view', 'Off'),
        value: 'off',
      },
    ];
  }

  public render() {
    const hasWireguardKey = this.props.wireguardKeyState.type === 'key-set';

    return (
      <ModalContainer>
        <Layout>
          <Container>
            <View style={styles.advanced_settings}>
              <NavigationContainer>
                <NavigationBar>
                  <NavigationItems>
                    <BackBarItem action={this.props.onClose}>
                      {
                        // TRANSLATORS: Back button in navigation bar
                        messages.pgettext('navigation-bar', 'Settings')
                      }
                    </BackBarItem>
                    <TitleBarItem>
                      {
                        // TRANSLATORS: Title label in navigation bar
                        messages.pgettext('advanced-settings-nav', 'Advanced')
                      }
                    </TitleBarItem>
                  </NavigationItems>
                </NavigationBar>

                <View style={styles.advanced_settings__container}>
                  <NavigationScrollbars style={styles.advanced_settings__scrollview}>
                    <SettingsHeader>
                      <HeaderTitle>
                        {messages.pgettext('advanced-settings-view', 'Advanced')}
                      </HeaderTitle>
                    </SettingsHeader>

                    <Cell.Container>
                      <Cell.Label>
                        {messages.pgettext('advanced-settings-view', 'Enable IPv6')}
                      </Cell.Label>
                      <Cell.Switch
                        isOn={this.props.enableIpv6}
                        onChange={this.props.setEnableIpv6}
                      />
                    </Cell.Container>
                    <Cell.Footer>
                      <Cell.FooterText>
                        {messages.pgettext(
                          'advanced-settings-view',
                          'Enable IPv6 communication through the tunnel.',
                        )}
                      </Cell.FooterText>
                    </Cell.Footer>

                    <Cell.Container>
                      <Cell.Label>
                        {messages.pgettext('advanced-settings-view', 'Always require VPN')}
                      </Cell.Label>
                      <Cell.Switch
                        isOn={this.props.blockWhenDisconnected}
                        onChange={this.setBlockWhenDisconnected}
                      />
                    </Cell.Container>
                    <Cell.Footer>
                      <Cell.FooterText>
                        {messages.pgettext(
                          'advanced-settings-view',
                          'If you disconnect or quit the app, this setting will block your internet.',
                        )}
                      </Cell.FooterText>
                    </Cell.Footer>

                    <View
                      style={[
                        styles.advanced_settings__content,
                        styles.advanced_settings__tunnel_protocol,
                      ]}>
                      <TunnelProtocolSelector
                        title={messages.pgettext('advanced-settings-view', 'Tunnel protocol')}
                        values={this.tunnelProtocolItems(hasWireguardKey)}
                        value={this.props.tunnelProtocol}
                        onSelect={this.onSelectTunnelProtocol}
                      />
                      {!hasWireguardKey && (
                        <Text style={styles.advanced_settings__wg_no_key}>
                          {messages.pgettext(
                            'advanced-settings-view',
                            'To enable WireGuard, generate a key under the "WireGuard key" setting below.',
                          )}
                        </Text>
                      )}
                    </View>

                    {this.props.tunnelProtocol !== 'wireguard' ? (
                      <View style={styles.advanced_settings__content}>
                        <Selector
                          title={messages.pgettext(
                            'advanced-settings-view',
                            'OpenVPN transport protocol',
                          )}
                          values={this.protocolItems}
                          value={this.props.openvpn.protocol}
                          onSelect={this.onSelectOpenvpnProtocol}
                        />

                        {this.props.openvpn.protocol ? (
                          <Selector
                            title={sprintf(
                              // TRANSLATORS: The title for the port selector section.
                              // TRANSLATORS: Available placeholders:
                              // TRANSLATORS: %(portType)s - a selected protocol (either TCP or UDP)
                              messages.pgettext(
                                'advanced-settings-view',
                                'OpenVPN %(portType)s port',
                              ),
                              {
                                portType: this.props.openvpn.protocol.toUpperCase(),
                              },
                            )}
                            values={this.portItems[this.props.openvpn.protocol]}
                            value={this.props.openvpn.port}
                            onSelect={this.onSelectOpenVpnPort}
                          />
                        ) : undefined}
                      </View>
                    ) : undefined}

                    {this.props.tunnelProtocol === 'wireguard' ? (
                      <View style={styles.advanced_settings__content}>
                        <Selector
                          // TRANSLATORS: The title for the shadowsocks bridge selector section.
                          title={messages.pgettext('advanced-settings-view', 'WireGuard port')}
                          values={this.wireguardPortItems}
                          value={this.props.wireguard.port}
                          onSelect={this.onSelectWireguardPort}
                        />
                      </View>
                    ) : undefined}

                    <Selector
                      title={
                        // TRANSLATORS: The title for the shadowsocks bridge selector section.
                        messages.pgettext('advanced-settings-view', 'Bridge mode')
                      }
                      values={this.bridgeStateItems}
                      value={this.props.bridgeState}
                      onSelect={this.onSelectBridgeState}
                    />

                    <Cell.Container>
                      <Cell.Label>
                        {messages.pgettext('advanced-settings-view', 'OpenVPN Mssfix')}
                      </Cell.Label>
                      <InputFrame>
                        <Cell.AutoSizingTextInput
                          value={this.props.mssfix ? this.props.mssfix.toString() : ''}
                          inputMode={'numeric'}
                          maxLength={4}
                          placeholder={messages.pgettext('advanced-settings-view', 'Default')}
                          onSubmitValue={this.onMssfixSubmit}
                          validateValue={AdvancedSettings.mssfixIsValid}
                          submitOnBlur={true}
                          modifyValue={AdvancedSettings.removeNonNumericCharacters}
                        />
                      </InputFrame>
                    </Cell.Container>
                    <Cell.Footer>
                      <Cell.FooterText>
                        {sprintf(
                          // TRANSLATORS: The hint displayed below the Mssfix input field.
                          // TRANSLATORS: Available placeholders:
                          // TRANSLATORS: %(max)d - the maximum possible mssfix value
                          // TRANSLATORS: %(min)d - the minimum possible mssfix value
                          messages.pgettext(
                            'advanced-settings-view',
                            'Set OpenVPN MSS value. Valid range: %(min)d - %(max)d.',
                          ),
                          {
                            min: MIN_MSSFIX_VALUE,
                            max: MAX_MSSFIX_VALUE,
                          },
                        )}
                      </Cell.FooterText>
                    </Cell.Footer>

                    <Cell.Container>
                      <Cell.Label>
                        {messages.pgettext('advanced-settings-view', 'WireGuard MTU')}
                      </Cell.Label>
                      <InputFrame>
                        <Cell.AutoSizingTextInput
                          value={this.props.wireguardMtu ? this.props.wireguardMtu.toString() : ''}
                          inputMode={'numeric'}
                          maxLength={4}
                          placeholder={messages.pgettext('advanced-settings-view', 'Default')}
                          onSubmitValue={this.onWireguardMtuSubmit}
                          validateValue={AdvancedSettings.wireguarMtuIsValid}
                          submitOnBlur={true}
                          modifyValue={AdvancedSettings.removeNonNumericCharacters}
                        />
                      </InputFrame>
                    </Cell.Container>
                    <Cell.Footer>
                      <Cell.FooterText>
                        {sprintf(
                          // TRANSLATORS: The hint displayed below the WireGuard MTU input field.
                          // TRANSLATORS: Available placeholders:
                          // TRANSLATORS: %(max)d - the maximum possible wireguard mtu value
                          // TRANSLATORS: %(min)d - the minimum possible wireguard mtu value
                          messages.pgettext(
                            'advanced-settings-view',
                            'Set WireGuard MTU value. Valid range: %(min)d - %(max)d.',
                          ),
                          {
                            min: MIN_WIREGUARD_MTU_VALUE,
                            max: MAX_WIREGUARD_MTU_VALUE,
                          },
                        )}
                      </Cell.FooterText>
                    </Cell.Footer>

                    <View style={styles.advanced_settings__wgkeys_cell}>
                      <Cell.CellButton onClick={this.props.onViewWireguardKeys}>
                        <Cell.Label>
                          {messages.pgettext('advanced-settings-view', 'WireGuard key')}
                        </Cell.Label>
                        <Cell.Icon height={12} width={7} source="icon-chevron" />
                      </Cell.CellButton>
                    </View>
                  </NavigationScrollbars>
                </View>
              </NavigationContainer>
            </View>
          </Container>
        </Layout>

        {this.state.showConfirmBlockWhenDisconnectedAlert &&
          this.renderConfirmBlockWhenDisconnectedAlert()}
      </ModalContainer>
    );
  }

  private tunnelProtocolItems = (
    hasWireguardKey: boolean,
  ): Array<ISelectorItem<OptionalTunnelProtocol>> => {
    return [
      {
        label: messages.pgettext('advanced-settings-view', 'Automatic'),
        value: undefined,
      },
      {
        label: messages.pgettext('advanced-settings-view', 'OpenVPN'),
        value: 'openvpn',
      },
      {
        label: hasWireguardKey
          ? messages.pgettext('advanced-settings-view', 'WireGuard')
          : sprintf('%(label)s (%(error)s)', {
              label: messages.pgettext('advanced-settings-view', 'WireGuard'),
              error: messages.pgettext('advanced-settings-view-wireguard', 'missing key'),
            }),
        value: 'wireguard',
        disabled: !hasWireguardKey,
      },
    ];
  };

  private renderConfirmBlockWhenDisconnectedAlert = () => {
    return (
      <ModalAlert
        type={ModalAlertType.Info}
        buttons={[
          <AppButton.RedButton key="confirm" onClick={this.confirmEnableBlockWhenDisconnected}>
            {messages.pgettext('advanced-settings-view', 'Enable anyway')}
          </AppButton.RedButton>,
          <AppButton.BlueButton key="back" onClick={this.hideConfirmBlockWhenDisconnectedAlert}>
            {messages.gettext('Back')}
          </AppButton.BlueButton>,
        ]}>
        <ModalMessage>
          {messages.pgettext(
            'advanced-settings-view',
            'Attention: enabling this will always require a Mullvad VPN connection in order to reach the internet.',
          )}
        </ModalMessage>
        <ModalMessage>
          {messages.pgettext(
            'advanced-settings-view',
            'The app’s built-in kill switch is always on. This setting will additionally block the internet if clicking Disconnect or Quit.',
          )}
        </ModalMessage>
      </ModalAlert>
    );
  };

  private setBlockWhenDisconnected = (newValue: boolean) => {
    if (newValue) {
      this.props.setBlockWhenDisconnected(true);
      this.setState({ showConfirmBlockWhenDisconnectedAlert: true });
    } else {
      this.props.setBlockWhenDisconnected(false);
    }
  };

  private hideConfirmBlockWhenDisconnectedAlert = () => {
    this.props.setBlockWhenDisconnected(false);
    this.setState({ showConfirmBlockWhenDisconnectedAlert: false });
  };

  private confirmEnableBlockWhenDisconnected = () => {
    this.props.setBlockWhenDisconnected(true);
    this.setState({ showConfirmBlockWhenDisconnectedAlert: false });
  };

  private onSelectTunnelProtocol = (protocol?: TunnelProtocol) => {
    this.props.setTunnelProtocol(protocol);
  };

  private onSelectOpenvpnProtocol = (protocol?: RelayProtocol) => {
    this.props.setOpenVpnRelayProtocolAndPort(protocol);
  };

  private onSelectOpenVpnPort = (port?: number) => {
    this.props.setOpenVpnRelayProtocolAndPort(this.props.openvpn.protocol, port);
  };

  private onSelectWireguardPort = (port?: number) => {
    this.props.setWireguardRelayPort(port);
  };

  private onSelectBridgeState = (bridgeState: BridgeState) => {
    this.props.setBridgeState(bridgeState);
  };

  private onMssfixSubmit = (value: string) => {
    const parsedValue = value === '' ? undefined : parseInt(value, 10);
    if (AdvancedSettings.mssfixIsValid(value)) {
      this.props.setOpenVpnMssfix(parsedValue);
    }
  };

  private static removeNonNumericCharacters(value: string) {
    return value.replace(/[^0-9]/g, '');
  }

  private static mssfixIsValid(mssfix: string): boolean {
    const parsedMssFix = mssfix ? parseInt(mssfix) : undefined;
    return (
      parsedMssFix === undefined ||
      (parsedMssFix >= MIN_MSSFIX_VALUE && parsedMssFix <= MAX_MSSFIX_VALUE)
    );
  }

  private onWireguardMtuSubmit = (value: string) => {
    const parsedValue = value === '' ? undefined : parseInt(value, 10);
    if (AdvancedSettings.wireguarMtuIsValid(value)) {
      this.props.setWireguardMtu(parsedValue);
    }
  };

  private static wireguarMtuIsValid(mtu: string): boolean {
    const parsedMtu = mtu ? parseInt(mtu) : undefined;
    return (
      parsedMtu === undefined ||
      (parsedMtu >= MIN_WIREGUARD_MTU_VALUE && parsedMtu <= MAX_WIREGUARD_MTU_VALUE)
    );
  }
}