// @flow
import * as React from 'react';
import autobind from 'autobind-decorator';
import classnames from 'classnames';
import { SortableContainer, SortableElement, arrayMove } from 'react-sortable-hoc/dist/es6';
import { Dropdown, DropdownButton, DropdownItem } from '../base/dropdown';
import PromptButton from '../base/prompt-button';
import Button from '../base/button';
import Link from '../base/link';
import EnvironmentEditor from '../editors/environment-editor';
import Editable from '../base/editable';
import Modal from '../base/modal';
import ModalBody from '../base/modal-body';
import ModalHeader from '../base/modal-header';
import ModalFooter from '../base/modal-footer';
import * as models from '../../../models';
import { DEBOUNCE_MILLIS } from '../../../common/constants';
import type { Workspace } from '../../../models/workspace';
import type { Environment } from '../../../models/environment';
import * as db from '../../../common/database';
import HelpTooltip from '../help-tooltip';
import Tooltip from '../tooltip';

const ROOT_ENVIRONMENT_NAME = 'Base Environment';

type Props = {
  activeEnvironmentId: string | null,
  editorFontSize: number,
  editorIndentSize: number,
  editorKeyMap: string,
  lineWrapping: boolean,
  render: Function,
  getRenderContext: Function,
  nunjucksPowerUserMode: boolean,
  isVariableUncovered: boolean,
};

type State = {
  workspace: Workspace | null,
  isValid: boolean,
  subEnvironments: Array<Environment>,
  rootEnvironment: Environment | null,
  selectedEnvironmentId: string | null,
};

const SidebarListItem = SortableElement(
  ({ environment, activeEnvironment, showEnvironment, changeEnvironmentName }) => {
    const classes = classnames({
      'env-modal__sidebar-item': true,
      'env-modal__sidebar-item--active': activeEnvironment === environment,
    });

    return (
      <li key={environment._id} className={classes}>
        <Button onClick={showEnvironment} value={environment}>
          <i className="fa fa-drag-handle drag-handle" />
          {environment.color ? (
            <i className="space-right fa fa-circle" style={{ color: environment.color }} />
          ) : (
            <i className="space-right fa fa-empty" />
          )}

          {environment.isPrivate && (
            <Tooltip position="top" message="Environment will not be exported or synced">
              <i className="fa fa-eye-slash faint space-right" />
            </Tooltip>
          )}

          <Editable
            className="inline-block"
            onSubmit={name => changeEnvironmentName(environment, name)}
            value={environment.name}
          />
        </Button>
      </li>
    );
  },
);

const SidebarList = SortableContainer(
  ({ environments, activeEnvironment, showEnvironment, changeEnvironmentName }) => (
    <ul>
      {environments.map((e, i) => (
        <SidebarListItem
          key={e._id}
          environment={e}
          index={i}
          activeEnvironment={activeEnvironment}
          showEnvironment={showEnvironment}
          changeEnvironmentName={changeEnvironmentName}
        />
      ))}
    </ul>
  ),
);

@autobind
class WorkspaceEnvironmentsEditModal extends React.PureComponent<Props, State> {
  environmentEditorRef: ?EnvironmentEditor;
  colorChangeTimeout: any;
  saveTimeout: any;
  modal: Modal;
  editorKey: number;

  constructor(props: Props) {
    super(props);
    this.state = {
      workspace: null,
      isValid: true,
      subEnvironments: [],
      rootEnvironment: null,
      selectedEnvironmentId: null,
    };

    this.colorChangeTimeout = null;
    this.editorKey = 0;
  }

  hide() {
    this.modal && this.modal.hide();
  }

  _setEditorRef(n: ?EnvironmentEditor) {
    this.environmentEditorRef = n;
  }

  _setModalRef(n: Modal | null) {
    this.modal = n;
  }

  async show(workspace: Workspace) {
    const { activeEnvironmentId } = this.props;

    // Default to showing the currently active environment
    if (activeEnvironmentId) {
      this.setState({ selectedEnvironmentId: activeEnvironmentId });
    }

    await this._load(workspace);

    this.modal && this.modal.show();
  }

  async _load(workspace: Workspace | null, environmentToSelect: Environment | null = null) {
    if (!workspace) {
      console.warn('Failed to reload environment editor without Workspace');
      return;
    }

    const rootEnvironment = await models.environment.getOrCreateForWorkspace(workspace);
    const subEnvironments = await models.environment.findByParentId(rootEnvironment._id);

    let selectedEnvironmentId;

    if (environmentToSelect) {
      selectedEnvironmentId = environmentToSelect._id;
    } else if (this.state.workspace && workspace._id !== this.state.workspace._id) {
      // We've changed workspaces, so load the root one
      selectedEnvironmentId = rootEnvironment._id;
    } else {
      // We haven't changed workspaces, so try loading the last environment, and fall back
      // to the root one
      selectedEnvironmentId = this.state.selectedEnvironmentId || rootEnvironment._id;
    }

    this.setState({
      workspace,
      rootEnvironment,
      subEnvironments,
      selectedEnvironmentId,
    });
  }

  async _handleAddEnvironment(isPrivate: boolean = false) {
    const { rootEnvironment, workspace } = this.state;

    if (!rootEnvironment) {
      console.warn('Failed to add environment. Unknown root environment');
      return;
    }

    const parentId = rootEnvironment._id;
    const environment = await models.environment.create({
      parentId,
      isPrivate,
    });
    await this._load(workspace, environment);
  }

  async _handleShowEnvironment(environment: Environment) {
    // Don't allow switching if the current one has errors
    if (this.environmentEditorRef && !this.environmentEditorRef.isValid()) {
      return;
    }

    if (environment === this._getActiveEnvironment()) {
      return;
    }

    const { workspace } = this.state;

    await this._load(workspace, environment);
  }

  async _handleDeleteEnvironment(environment: Environment) {
    const { rootEnvironment, workspace } = this.state;

    // Don't delete the root environment
    if (environment === rootEnvironment) {
      return;
    }

    // Delete the current one, then activate the root environment
    await models.environment.remove(environment);
    await this._load(workspace, rootEnvironment);
  }

  async _handleChangeEnvironmentName(environment: Environment, name: string) {
    const { workspace } = this.state;

    // NOTE: Fetch the environment first because it might not be up to date.
    // For example, editing the body updates silently.
    const realEnvironment = await models.environment.getById(environment._id);

    if (!realEnvironment) {
      return;
    }

    await models.environment.update(realEnvironment, { name });
    await this._load(workspace);
  }

  _handleChangeEnvironmentColor(environment: Environment, color: string | null) {
    clearTimeout(this.colorChangeTimeout);
    this.colorChangeTimeout = setTimeout(async () => {
      const { workspace } = this.state;
      await models.environment.update(environment, { color });
      await this._load(workspace);
    }, DEBOUNCE_MILLIS);
  }

  _didChange() {
    this._saveChanges();

    // Call this last in case component unmounted
    const isValid = this.environmentEditorRef ? this.environmentEditorRef.isValid() : false;
    if (this.state.isValid !== isValid) {
      this.setState({ isValid });
    }
  }

  _getActiveEnvironment(): Environment | null {
    const { selectedEnvironmentId, subEnvironments, rootEnvironment } = this.state;
    if (rootEnvironment && rootEnvironment._id === selectedEnvironmentId) {
      return rootEnvironment;
    } else {
      return subEnvironments.find(e => e._id === selectedEnvironmentId) || null;
    }
  }

  _handleUnsetColor(environment: Environment) {
    this._handleChangeEnvironmentColor(environment, null);
  }

  componentDidMount() {
    db.onChange(async changes => {
      const { selectedEnvironmentId } = this.state;

      for (const change of changes) {
        const [
          _, // eslint-disable-line no-unused-vars
          doc,
          fromSync,
        ] = change;

        // Force an editor refresh if any changes from sync come in
        if (doc._id === selectedEnvironmentId && fromSync) {
          this.editorKey = doc.modified;
          await this._load(this.state.workspace);
        }
      }
    });
  }

  async _handleSortEnd(results: {
    oldIndex: number,
    newIndex: number,
    collection: Array<Environment>,
  }) {
    const { oldIndex, newIndex } = results;
    if (newIndex === oldIndex) {
      return;
    }

    const { subEnvironments } = this.state;

    const newSubEnvironments = arrayMove(subEnvironments, oldIndex, newIndex);
    this.setState({ subEnvironments: newSubEnvironments });

    // Do this last so we don't block the sorting
    db.bufferChanges();
    for (let i = 0; i < newSubEnvironments.length; i++) {
      const environment = newSubEnvironments[i];
      await models.environment.update(environment, { metaSortKey: i });
    }
    db.flushChanges();
  }

  async _handleClickColorChange(environment: Environment) {
    let el = document.querySelector('#env-color-picker');

    // Remove existing child so we reset the event handlers. This
    // was easier than trying to clean them up later.
    if (el && el.parentNode) {
      el.parentNode.removeChild(el);
    }

    el = document.createElement('input');
    el.id = 'env-color-picker';
    el.type = 'color';
    document.body && document.body.appendChild(el);

    let color = environment.color || '#7d69cb';

    if (!environment.color) {
      await this._handleChangeEnvironmentColor(environment, color);
    }

    el.setAttribute('value', color);
    el.addEventListener('input', (e: Event) => {
      if (e.target instanceof HTMLInputElement) {
        this._handleChangeEnvironmentColor(environment, e.target && e.target.value);
      }
    });

    el.click();
  }

  _saveChanges() {
    // Only save if it's valid
    if (!this.environmentEditorRef || !this.environmentEditorRef.isValid()) {
      return;
    }

    let data;
    try {
      data = this.environmentEditorRef.getValue();
    } catch (err) {
      // Invalid JSON probably
      return;
    }

    const activeEnvironment = this._getActiveEnvironment();

    if (activeEnvironment) {
      clearTimeout(this.saveTimeout);
      this.saveTimeout = setTimeout(() => {
        models.environment.update(activeEnvironment, { data });
      }, DEBOUNCE_MILLIS * 4);
    }
  }

  render() {
    const {
      editorFontSize,
      editorIndentSize,
      editorKeyMap,
      lineWrapping,
      render,
      getRenderContext,
      nunjucksPowerUserMode,
      isVariableUncovered,
    } = this.props;

    const { subEnvironments, rootEnvironment, isValid } = this.state;

    const activeEnvironment = this._getActiveEnvironment();

    return (
      <Modal ref={this._setModalRef} wide tall {...this.props}>
        <ModalHeader>Manage Environments</ModalHeader>
        <ModalBody noScroll className="env-modal">
          <div className="env-modal__sidebar">
            <li
              className={classnames('env-modal__sidebar-root-item', {
                'env-modal__sidebar-item--active': activeEnvironment === rootEnvironment,
              })}>
              <Button onClick={this._handleShowEnvironment} value={rootEnvironment}>
                {ROOT_ENVIRONMENT_NAME}
                <HelpTooltip className="space-left">
                  The variables in this environment are always available, regardless of which
                  sub-environment is active. Useful for storing default or fallback values.
                </HelpTooltip>
              </Button>
            </li>
            <div className="pad env-modal__sidebar-heading">
              <h3 className="no-margin">Sub Environments</h3>
              <Dropdown right>
                <DropdownButton>
                  <i className="fa fa-plus-circle" />
                  <i className="fa fa-caret-down" />
                </DropdownButton>
                <DropdownItem onClick={this._handleAddEnvironment} value={false}>
                  <i className="fa fa-eye" /> Environment
                </DropdownItem>
                <DropdownItem
                  onClick={this._handleAddEnvironment}
                  value={true}
                  title="Environment will not be exported or synced">
                  <i className="fa fa-eye-slash" /> Private Environment
                </DropdownItem>
              </Dropdown>
            </div>
            <SidebarList
              environments={subEnvironments}
              activeEnvironment={activeEnvironment}
              showEnvironment={this._handleShowEnvironment}
              changeEnvironmentName={this._handleChangeEnvironmentName}
              onSortEnd={this._handleSortEnd}
              helperClass="env-modal__sidebar-item--dragging"
              transitionDuration={0}
              useWindowAsScrollContainer={false}
            />
          </div>
          <div className="env-modal__main">
            <div className="env-modal__main__header">
              <h1>
                {rootEnvironment === activeEnvironment ? (
                  ROOT_ENVIRONMENT_NAME
                ) : (
                  <Editable
                    singleClick
                    className="wide"
                    onSubmit={name =>
                      activeEnvironment &&
                      this._handleChangeEnvironmentName(activeEnvironment, name)
                    }
                    value={activeEnvironment ? activeEnvironment.name : ''}
                  />
                )}
              </h1>

              {activeEnvironment && rootEnvironment !== activeEnvironment ? (
                <Dropdown className="space-right" right>
                  <DropdownButton className="btn btn--clicky">
                    {activeEnvironment.color && (
                      <i
                        className="fa fa-circle space-right"
                        style={{ color: activeEnvironment.color }}
                      />
                    )}
                    Color <i className="fa fa-caret-down" />
                  </DropdownButton>

                  <DropdownItem value={activeEnvironment} onClick={this._handleClickColorChange}>
                    <i className="fa fa-circle" style={{ color: activeEnvironment.color }} />
                    {activeEnvironment.color ? 'Change Color' : 'Assign Color'}
                  </DropdownItem>

                  <DropdownItem
                    value={activeEnvironment}
                    onClick={this._handleUnsetColor}
                    disabled={!activeEnvironment.color}>
                    <i className="fa fa-minus-circle" />
                    Unset Color
                  </DropdownItem>
                </Dropdown>
              ) : null}

              {activeEnvironment && rootEnvironment !== activeEnvironment ? (
                <PromptButton
                  value={activeEnvironment}
                  onClick={this._handleDeleteEnvironment}
                  className="btn btn--clicky">
                  <i className="fa fa-trash-o" />
                </PromptButton>
              ) : null}
            </div>
            <div className="env-modal__editor">
              <EnvironmentEditor
                editorFontSize={editorFontSize}
                editorIndentSize={editorIndentSize}
                editorKeyMap={editorKeyMap}
                lineWrapping={lineWrapping}
                ref={this._setEditorRef}
                key={`${this.editorKey}::${activeEnvironment ? activeEnvironment._id : 'n/a'}`}
                environment={activeEnvironment ? activeEnvironment.data : {}}
                didChange={this._didChange}
                render={render}
                getRenderContext={getRenderContext}
                nunjucksPowerUserMode={nunjucksPowerUserMode}
                isVariableUncovered={isVariableUncovered}
              />
            </div>
          </div>
        </ModalBody>
        <ModalFooter>
          <div className="margin-left italic txt-sm tall">
            * Environment data can be used for&nbsp;
            <Link href="https://support.insomnia.rest/article/40-template-tags">
              Nunjucks Templating
            </Link>{' '}
            in your requests
          </div>
          <button className="btn" disabled={!isValid} onClick={this.hide}>
            Done
          </button>
        </ModalFooter>
      </Modal>
    );
  }
}

export default WorkspaceEnvironmentsEditModal;