import React, { useEffect, useState } from "react";
import { useHistory } from "react-router-dom";
import { useTranslation } from "react-i18next";
import { Controller, useForm } from "react-hook-form";
import {
  ActionGroup,
  AlertVariant,
  Button,
  ButtonVariant,
  ClipboardCopy,
  DropdownItem,
  DropdownSeparator,
  FormGroup,
  PageSection,
  Select,
  SelectOption,
  SelectVariant,
  Stack,
  StackItem,
  Switch,
  Tab,
  Tabs,
  TabTitleText,
  TextInput,
} from "@patternfly/react-core";

import RealmRepresentation from "keycloak-admin/lib/defs/realmRepresentation";
import { getBaseUrl, toUpperCase } from "../util";
import { useConfirmDialog } from "../components/confirm-dialog/ConfirmDialog";
import { useAdminClient, asyncStateFetch } from "../context/auth/AdminClient";
import { useRealm } from "../context/realm-context/RealmContext";
import { ViewHeader } from "../components/view-header/ViewHeader";
import { useAlerts } from "../components/alert/Alerts";
import { FormAccess } from "../components/form-access/FormAccess";
import { HelpItem } from "../components/help-enabler/HelpItem";
import { FormattedLink } from "../components/external-link/FormattedLink";

type RealmSettingsHeaderProps = {
  onChange: (value: boolean) => void;
  value: boolean;
  save: () => void;
  realmName: string;
};

const RealmSettingsHeader = ({
  save,
  onChange,
  value,
  realmName,
}: RealmSettingsHeaderProps) => {
  const { t } = useTranslation("realm-settings");
  const adminClient = useAdminClient();
  const { addAlert } = useAlerts();
  const history = useHistory();
  const { setRealm } = useRealm();

  const [toggleDisableDialog, DisableConfirm] = useConfirmDialog({
    titleKey: "realm-settings:disableConfirmTitle",
    messageKey: "realm-settings:disableConfirm",
    continueButtonLabel: "common:disable",
    onConfirm: () => {
      onChange(!value);
      save();
    },
  });

  const [toggleDeleteDialog, DeleteConfirm] = useConfirmDialog({
    titleKey: "realm-settings:deleteConfirmTitle",
    messageKey: "realm-settings:deleteConfirm",
    continueButtonLabel: "common:delete",
    continueButtonVariant: ButtonVariant.danger,
    onConfirm: async () => {
      try {
        await adminClient.realms.del({ realm: realmName });
        addAlert(t("deletedSuccess"), AlertVariant.success);
        setRealm("master");
        history.push("/master");
      } catch (error) {
        addAlert(t("deleteError", { error }), AlertVariant.danger);
      }
    },
  });

  return (
    <>
      <DisableConfirm />
      <DeleteConfirm />
      <ViewHeader
        titleKey={toUpperCase(realmName)}
        subKey=""
        dropdownItems={[
          <DropdownItem key="import" onClick={() => {}}>
            {t("partialImport")}
          </DropdownItem>,
          <DropdownItem key="export" onClick={() => {}}>
            {t("partialExport")}
          </DropdownItem>,
          <DropdownSeparator key="separator" />,
          <DropdownItem key="delete" onClick={toggleDeleteDialog}>
            {t("common:delete")}
          </DropdownItem>,
        ]}
        isEnabled={value}
        onToggle={(value) => {
          if (!value) {
            toggleDisableDialog();
          } else {
            onChange(value);
            save();
          }
        }}
      />
    </>
  );
};

const requireSslTypes = ["all", "external", "none"];

export const RealmSettingsSection = () => {
  const { t } = useTranslation("realm-settings");
  const adminClient = useAdminClient();
  const { realm: realmName } = useRealm();
  const { addAlert } = useAlerts();
  const { register, control, getValues, setValue, handleSubmit } = useForm();
  const [realm, setRealm] = useState<RealmRepresentation>();
  const [activeTab, setActiveTab] = useState(0);
  const [open, setOpen] = useState(false);

  const baseUrl = getBaseUrl(adminClient);

  useEffect(() => {
    return asyncStateFetch(
      () => adminClient.realms.findOne({ realm: realmName }),
      (realm) => {
        setRealm(realm);
        setupForm(realm);
      }
    );
  }, []);

  const setupForm = (realm: RealmRepresentation) => {
    Object.entries(realm).map((entry) => setValue(entry[0], entry[1]));
  };

  const save = async (realm: RealmRepresentation) => {
    try {
      await adminClient.realms.update({ realm: realmName }, realm);
      setRealm(realm);
      addAlert(t("saveSuccess"), AlertVariant.success);
    } catch (error) {
      addAlert(t("saveError", { error }), AlertVariant.danger);
    }
  };

  return (
    <>
      <Controller
        name="enabled"
        control={control}
        defaultValue={true}
        render={({ onChange, value }) => (
          <RealmSettingsHeader
            value={value}
            onChange={onChange}
            realmName={realmName}
            save={() => save(getValues())}
          />
        )}
      />

      <PageSection variant="light">
        <Tabs
          activeKey={activeTab}
          onSelect={(_, key) => setActiveTab(key as number)}
          isBox
        >
          <Tab eventKey={0} title={<TabTitleText>{t("general")}</TabTitleText>}>
            <FormAccess
              isHorizontal
              role="manage-realm"
              className="pf-u-mt-lg"
              onSubmit={handleSubmit(save)}
            >
              <FormGroup label={t("realmId")} fieldId="kc-realm-id" isRequired>
                <ClipboardCopy isReadOnly>{realmName}</ClipboardCopy>
              </FormGroup>
              <FormGroup label={t("displayName")} fieldId="kc-display-name">
                <TextInput
                  type="text"
                  id="kc-display-name"
                  name="displayName"
                  ref={register}
                />
              </FormGroup>
              <FormGroup
                label={t("htmlDisplayName")}
                fieldId="kc-html-display-name"
              >
                <TextInput
                  type="text"
                  id="kc-html-display-name"
                  name="displayNameHtml"
                  ref={register}
                />
              </FormGroup>
              <FormGroup
                label={t("frontendUrl")}
                fieldId="kc-frontend-url"
                labelIcon={
                  <HelpItem
                    helpText="realm-settings-help:frontendUrl"
                    forLabel={t("frontendUrl")}
                    forID="kc-frontend-url"
                  />
                }
              >
                <TextInput
                  type="text"
                  id="kc-frontend-url"
                  name="attributes.frontendUrl"
                  ref={register}
                />
              </FormGroup>
              <FormGroup
                label={t("requireSsl")}
                fieldId="kc-require-ssl"
                labelIcon={
                  <HelpItem
                    helpText="realm-settings-help:requireSsl"
                    forLabel={t("requireSsl")}
                    forID="kc-require-ssl"
                  />
                }
              >
                <Controller
                  name="sslRequired"
                  defaultValue="none"
                  control={control}
                  render={({ onChange, value }) => (
                    <Select
                      toggleId="kc-require-ssl"
                      onToggle={() => setOpen(!open)}
                      onSelect={(_, value) => {
                        onChange(value as string);
                        setOpen(false);
                      }}
                      selections={value}
                      variant={SelectVariant.single}
                      aria-label={t("requireSsl")}
                      isOpen={open}
                    >
                      {requireSslTypes.map((sslType) => (
                        <SelectOption
                          selected={sslType === value}
                          key={sslType}
                          value={sslType}
                        >
                          {t(`sslType.${sslType}`)}
                        </SelectOption>
                      ))}
                    </Select>
                  )}
                />
              </FormGroup>
              <FormGroup
                hasNoPaddingTop
                label={t("userManagedAccess")}
                labelIcon={
                  <HelpItem
                    helpText="realm-settings-help:userManagedAccess"
                    forLabel={t("userManagedAccess")}
                    forID="kc-user-manged-access"
                  />
                }
                fieldId="kc-user-manged-access"
              >
                <Controller
                  name="userManagedAccessAllowed"
                  control={control}
                  defaultValue={false}
                  render={({ onChange, value }) => (
                    <Switch
                      id="kc-user-manged-access"
                      label={t("common:on")}
                      labelOff={t("common:off")}
                      isChecked={value}
                      onChange={onChange}
                    />
                  )}
                />
              </FormGroup>
              <FormGroup
                label={t("endpoints")}
                labelIcon={
                  <HelpItem
                    helpText="realm-settings-help:endpoints"
                    forLabel={t("endpoints")}
                    forID="kc-endpoints"
                  />
                }
                fieldId="kc-endpoints"
              >
                <Stack>
                  <StackItem>
                    <FormattedLink
                      href={`${baseUrl}realms/${realmName}/.well-known/openid-configuration`}
                      title={t("openEndpointConfiguration")}
                    />
                  </StackItem>
                  <StackItem>
                    <FormattedLink
                      href={`${baseUrl}realms/${realmName}/protocol/saml/descriptor`}
                      title={t("samlIdentityProviderMetadata")}
                    />
                  </StackItem>
                </Stack>
              </FormGroup>

              <ActionGroup>
                <Button variant="primary" type="submit">
                  {t("common:save")}
                </Button>
                <Button variant="link" onClick={() => setupForm(realm!)}>
                  {t("common:reload")}
                </Button>
              </ActionGroup>
            </FormAccess>
          </Tab>
        </Tabs>
      </PageSection>
    </>
  );
};