/**
 *  Copyright (C) 2018 Basalt
    This file is part of Knapsack.
    Knapsack is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the Free
    Software Foundation; either version 2 of the License, or (at your option)
    any later version.

    Knapsack is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
    more details.

    You should have received a copy of the GNU General Public License along
    with Knapsack; if not, see <https://www.gnu.org/licenses>.
 */
import React, { Component } from 'react';
import { connect } from 'react-redux';
import PropTypes from 'prop-types';
import arrayMove from 'array-move';
import shortid from 'shortid';
import { Spinner, StatusMessage } from '@knapsack/design-system';
// @todo determine if this is still functioning; upgraded `react-dnd` from v5 => v9 and just updated this import without checking to see if it works since it's been disabled as part of Knapsack v1 => v2
import { DndContext } from 'react-dnd';
import HTML5Backend from 'react-dnd-html5-backend';
import { Query, Mutation } from 'react-apollo';
import gql from 'graphql-tag';
import PageWithSidebar from '../../layouts/page-with-sidebar';
import PlaygroundSlice from './page-builder-slice';
import PageBuilderStartSliceInsert from './page-builder-start-slice-insert';
import PageBuilderSidebar, {
  SIDEBAR_DEFAULT,
  SIDEBAR_FORM,
  SIDEBAR_PATTERNS,
} from './page-builder-sidebar';
import { PageBuilderContext } from './page-builder-context';
import './index.scss';

const query = gql`
  query PageBuilerPages($id: ID) {
    pageBuilderPage(id: $id) {
      id
      title
      path
      description
      slices {
        id
        patternId
        templateId
        data
      }
    }
    patterns {
      id
      templates {
        id
        path
        schema
        title
        demoDatas
        uiSchema
      }
      meta {
        description
        title
        uses
        type
        hasIcon
      }
    }
  }
`;

const mutation = gql`
  mutation setPageBuilderPage($id: ID, $data: JSON) {
    setPageBuilderPage(id: $id, data: $data) {
      id
      title
      path
      slices {
        id
        patternId
        data
      }
    }
  }
`;

class Playground extends Component {
  static contextType = PageBuilderContext;

  constructor(props) {
    super(props);

    this.handleAddSlice = this.handleAddSlice.bind(this);
    this.moveSlice = this.moveSlice.bind(this);
    this.moveSliceUp = this.moveSliceUp.bind(this);
    this.moveSliceDown = this.moveSliceDown.bind(this);
    this.deleteSlice = this.deleteSlice.bind(this);
    this.handleHideEditForm = this.handleHideEditForm.bind(this);
    this.save = this.save.bind(this);
    this.getTemplateFromPatternId = this.getTemplateFromPatternId.bind(this);
    this.handleEditFormChange = this.handleEditFormChange.bind(this);
    this.handleClearData = this.handleClearData.bind(this);
    this.handleCancelAddSlice = this.handleCancelAddSlice.bind(this);
    this.handleFilterChange = this.handleFilterChange.bind(this);
    this.handleFilterReset = this.handleFilterReset.bind(this);
    this.handleMetaFormChange = this.handleMetaFormChange.bind(this);
    this.handleStartInsertSlice = this.handleStartInsertSlice.bind(this);
    this.briefHighlight = this.briefHighlight.bind(this);

    // All state is passed to PageBuilderContext so all children can use it
    /* eslint-disable react/no-unused-state, react/prop-types */
    this.state = {
      isUserAbleToSave: props.isUserAbleToSave,
      patterns: [],
      example: null,
      slices: null,
      sidebarContent: SIDEBAR_DEFAULT,
      editFormInsertionIndex: null,
      editFormSchema: {},
      editFormUiSchema: {},
      editFormSliceId: null,
      filterTerm: '',
      statusMessage: '',
      statusType: 'info',
      hasVisibleControls: true,
      changeId: null,
      handleAddSlice: this.handleAddSlice,
    };
    /* eslint-enable react/no-unused-state, react/prop-types */
  }

  /**
   * @param {string} patternId - ID of Pattern, i.e. `media-block`
   * @param {string} [templateId] - ID of Template
   * @return {import('../../../schemas/patterns').KnapsackPatternTemplate} - Pattern template
   */
  getTemplateFromPatternId(patternId, templateId) {
    const pattern = this.state.patterns.find(p => p.id === patternId);
    if (templateId) {
      return pattern.templates.find(t => t.id === templateId);
    }
    return pattern.templates[0];
  }

  handleFilterReset() {
    this.setState({
      filterTerm: '',
    });
  }

  /**
   * Save Whole Example page to server via GraphQL mutation
   * @param {Function} setPageBuilderPage - The function provided by the GraphQL <Mutation> component
   * @return {Promise<object>|null} - Returns the structued object defined by the mutation.
   */
  async save(setPageBuilderPage) {
    if (!this.props.isUserAbleToSave) {
      this.setState({
        statusMessage:
          'Updating and saving data has been disabled through feature flags. This page builder example cannot be saved at this time.',
        statusType: 'error',
      });
      setTimeout(() => {
        this.setState({
          statusMessage: '',
          statusType: 'info',
        });
      }, 6000);
      return null;
    }
    const results = await setPageBuilderPage({
      variables: {
        id: this.props.id,
        data: { ...this.state.example, slices: this.state.slices },
      },
    });
    if (results.data) {
      this.setState({
        statusMessage: 'Page Builder example saved',
      });
      setTimeout(() => {
        this.setState({
          statusMessage: '',
        });
      }, 3000);
    }
    return results;
  }

  handleHideEditForm() {
    this.setState({
      editFormSliceId: null,
      sidebarContent: SIDEBAR_DEFAULT,
      changeId: null,
    });
  }

  /**
   * Move Slice
   * @param {number} fromIndex - Move this item
   * @param {number} toIndex - To this index
   * @param {string} id - Slice Id
   * @return {void} - sets state
   */
  moveSlice(fromIndex, toIndex, id) {
    this.setState(prevState => ({
      slices: arrayMove(prevState.slices, fromIndex, toIndex),
      editFormInsertionIndex: null,
    }));
    this.briefHighlight(id);
  }

  /**
   * @param {number} index - Index of item in `this.state.slices` to move up
   * @param {number} id - ID of item in `this.state.slices` to move up
   * @return {void} - sets state
   */
  moveSliceUp(index, id) {
    this.setState(prevState => ({
      slices: arrayMove(prevState.slices, index, index - 1),
      editFormInsertionIndex: null,
      sidebarContent: SIDEBAR_DEFAULT,
      editFormSliceId: null,
    }));
    this.briefHighlight(id);
  }

  /**
   * @param {number} index - Index of item in `this.state.slices` to move down
   * @param {number} id - ID of item in `this.state.slices` to move down
   * @return {void} - sets state
   */
  moveSliceDown(index, id) {
    this.setState(prevState => ({
      slices: arrayMove(prevState.slices, index, index + 1),
      editFormInsertionIndex: null,
      sidebarContent: SIDEBAR_DEFAULT,
      editFormSliceId: null,
    }));
    this.briefHighlight(id);
  }

  deleteSlice(sliceId) {
    this.setState(prevState => ({
      slices: prevState.slices.filter(slice => slice.id !== sliceId),
      sidebarContent: SIDEBAR_DEFAULT,
      editFormInsertionIndex: null,
    }));
    this.setState({
      statusMessage: 'Slice Deleted',
    });
    setTimeout(() => {
      this.setState({
        statusMessage: '',
      });
    }, 3000);
  }

  briefHighlight(sliceId) {
    this.setState({
      changeId: sliceId,
    });
    setTimeout(() => {
      this.setState({
        changeId: null,
      });
    }, 1000);
  }

  /**
   * @param {string} patternId - unique id
   * @param {string} templateId - unique id
   * @returns {void} - sets state
   */
  handleAddSlice(patternId, templateId) {
    const {
      schema,
      uiSchema,
      demoDatas = [{}],
    } = this.getTemplateFromPatternId(patternId, templateId);
    const id = shortid.generate();
    this.setState(prevState => {
      prevState.slices.splice(prevState.editFormInsertionIndex, 0, {
        id,
        patternId,
        templateId,
        data: demoDatas[0],
      });
      return {
        slices: prevState.slices,
        editFormSliceId: id,
        editFormSchema: schema,
        editFormUiSchema: uiSchema,
        sidebarContent: SIDEBAR_FORM,
        editFormInsertionIndex: null,
      };
    });
    this.briefHighlight(id);
    this.handleFilterReset();
  }

  handleStartInsertSlice(index) {
    this.setState({
      sidebarContent: SIDEBAR_PATTERNS,
      editFormInsertionIndex: index,
      editFormSliceId: null,
    });
  }

  handleEditFormChange(data) {
    this.setState(prevState => ({
      slices: prevState.slices.map(slice => {
        if (slice.id === prevState.editFormSliceId) {
          slice.data = data.formData;
        }
        return slice;
      }),
    }));
  }

  handleClearData() {
    this.setState(prevState => ({
      slices: prevState.slices.map(slice => {
        if (slice.id === prevState.editFormSliceId) {
          slice.data = {};
        }
        return slice;
      }),
    }));
  }

  handleCancelAddSlice() {
    this.setState({
      editFormSliceId: null,
      editFormInsertionIndex: null,
      sidebarContent: SIDEBAR_DEFAULT,
    });
  }

  handleFilterChange(event) {
    this.setState({ filterTerm: event.target.value });
  }

  handleMetaFormChange(formData) {
    this.setState(prevState => ({
      example: { ...prevState.example, ...formData },
      hasVisibleControls: formData.hasVisibleControls,
    }));
  }

  render() {
    if (!this.state.example) {
      return (
        <Query query={query} variables={{ id: this.props.id }}>
          {({ loading, error, data }) => {
            if (loading) return <Spinner />;
            if (error)
              return <StatusMessage message={error.message} type="error" />;
            this.setState({
              example: data.pageBuilderPage,
              slices: data.pageBuilderPage.slices,
              patterns: data.patterns,
            });
            return null;
          }}
        </Query>
      );
    }
    const { props } = this;
    const SideBarContent = (
      <>
        <Mutation
          mutation={mutation}
          variables={{
            id: this.props.id,
            data: this.state.example,
          }}
        >
          {(setPageBuilderPage, { error }) => (
            <>
              {error && <StatusMessage message={error.message} type="error" />}
              <PageBuilderSidebar
                editFormSchema={this.state.editFormSchema}
                editFormUiSchema={this.state.editFormUiSchema}
                editFormSliceId={this.state.editFormSliceId}
                filterTerm={this.state.filterTerm}
                handleEditFormChange={this.handleEditFormChange}
                handleClearData={this.handleClearData}
                handleCancelAddSlice={this.handleCancelAddSlice}
                handleHideEditForm={this.handleHideEditForm}
                handleFilterChange={this.handleFilterChange}
                handleFilterReset={this.handleFilterReset}
                handleMetaFormChange={this.handleMetaFormChange}
                handleSave={() => this.save(setPageBuilderPage)}
                metaFormData={this.state.example}
                patterns={this.props.patterns}
                sidebarContent={this.state.sidebarContent}
                slices={this.state.slices}
              />
            </>
          )}
        </Mutation>
      </>
    );
    return (
      <PageBuilderContext.Provider value={this.state}>
        <PageWithSidebar {...props} sidebar={SideBarContent}>
          <div className="ks-page-builder-index">
            {this.state.hasVisibleControls && (
              <>
                <h4 className="ks-eyebrow">Prototyping Sandbox</h4>
                <h2>{this.state.example.title}</h2>

                {this.state.statusMessage && (
                  <StatusMessage
                    message={this.state.statusMessage}
                    // @ts-ignore
                    type={this.state.statusType}
                  />
                )}
              </>
            )}
            <PageBuilderStartSliceInsert
              onClick={() => this.handleStartInsertSlice(0)}
              onKeyPress={() => this.handleStartInsertSlice(0)}
              hasVisibleControls={this.state.hasVisibleControls}
              isActive={this.state.editFormInsertionIndex === 0}
            />
            {this.state.slices.map((slice, sliceIndex) => {
              const { templateId, patternId } = slice;
              const template = this.getTemplateFromPatternId(
                slice.patternId,
                templateId,
              );
              if (!slice.patternId && slice.templateId) {
                return (
                  <div
                    key={`${slice.id}--fragment`}
                    onKeyPress={() => this.deleteSlice(slice.id)}
                    onClick={() => this.deleteSlice(slice.id)}
                    role="button"
                    aria-label="delete component"
                    tabIndex={0}
                  >
                    <StatusMessage
                      message={`Template for "${slice.patternId}" not found. Click to delete.`}
                      type="warning"
                    />
                  </div>
                );
              }
              return (
                <React.Fragment key={`${slice.id}--fragment`}>
                  {template && (
                    <PlaygroundSlice
                      key={slice.id}
                      id={slice.id}
                      index={sliceIndex}
                      templateId={template.id}
                      patternId={patternId}
                      data={slice.data}
                      showEditForm={() => {
                        this.setState({
                          editFormSliceId: slice.id,
                          editFormSchema: template.schema,
                          editFormUiSchema: template.uiSchema,
                          sidebarContent: SIDEBAR_FORM,
                          editFormInsertionIndex: null,
                        });
                        this.briefHighlight(slice.id);
                      }}
                      deleteMe={() => this.deleteSlice(slice.id)}
                      moveSlice={(dragIndex, hoverIndex) => {
                        console.log('moving...', { dragIndex, hoverIndex });
                        this.moveSlice(dragIndex, hoverIndex, slice.id);
                      }}
                      moveUp={() => this.moveSliceUp(sliceIndex, slice.id)}
                      moveDown={() => this.moveSliceDown(sliceIndex, slice.id)}
                      hasVisibleControls={this.state.hasVisibleControls}
                      isBeingEdited={this.state.editFormSliceId === slice.id}
                      isFirst={sliceIndex === 0}
                      isLast={this.state.slices.length - 1 === sliceIndex}
                      isChanged={this.state.changeId === slice.id}
                    />
                  )}
                  <PageBuilderStartSliceInsert
                    key={`${slice.id}--handleAddSlice`}
                    onClick={() => this.handleStartInsertSlice(sliceIndex + 1)}
                    onKeyPress={() =>
                      this.handleStartInsertSlice(sliceIndex + 1)
                    }
                    isActive={
                      this.state.editFormInsertionIndex === sliceIndex + 1
                    }
                    hasVisibleControls={this.state.hasVisibleControls}
                  />
                </React.Fragment>
              );
            })}
          </div>
        </PageWithSidebar>
      </PageBuilderContext.Provider>
    );
  }
}

function mapStateToProps({ patternsState, userState }) {
  return {
    patterns: patternsState.patterns,
    isUserAbleToSave: userState.role.permissions.includes('write'),
  };
}

Playground.propTypes = {
  isUserAbleToSave: PropTypes.bool.isRequired,
  // context: contextPropTypes.isRequired,
  patterns: PropTypes.array.isRequired, // eslint-disable-line
  example: PropTypes.object.isRequired, // eslint-disable-line
  id: PropTypes.string.isRequired, // @todo save/show playgrounds based on `id`
};

export default DndContext(HTML5Backend)(connect(mapStateToProps)(Playground));