import classNames = require("classnames");
import { observer } from "mobx-react";
import * as React from "react";
import {
  SortableContainer,
  SortableElement,
  SortableHandle,
  SortEnd
} from "react-sortable-hoc";
import { Button, Form, Icon, List } from "semantic-ui-react";

import { DurationView, SectionChooser } from "@client/components/index";
import { Duration } from "@common/Duration";
import { ProgramItem, Section } from "@common/sprinklersRpc";

import "@client/styles/ProgramSequenceView";
import { action } from "mobx";

type ItemChangeHandler = (index: number, newItem: ProgramItem) => void;
type ItemRemoveHandler = (index: number) => void;

const Handle = SortableHandle(() => (
  <Button basic icon>
    <Icon name="bars" />
  </Button>
));

@observer
class ProgramSequenceItem extends React.Component<{
  sequenceItem: ProgramItem;
  idx: number;
  sections: Section[];
  editing: boolean;
  onChange: ItemChangeHandler;
  onRemove: ItemRemoveHandler;
}> {
  renderContent() {
    const { editing, sequenceItem, sections } = this.props;
    const section = sections[sequenceItem.section];
    const duration = Duration.fromSeconds(sequenceItem.duration);

    if (editing) {
      return (
        <Form.Group>
          <Button icon negative onClick={this.onRemove}>
            <Icon name="cancel" />
          </Button>
          <SectionChooser
            label="Section"
            sections={sections}
            sectionId={section.id}
            onChange={this.onSectionChange}
          />
          <DurationView
            label="Duration"
            duration={duration}
            onDurationChange={this.onDurationChange}
          />
        </Form.Group>
      );
    } else {
      return (
        <React.Fragment>
          <List.Header>{section.toString()}</List.Header>
          <List.Description>for {duration.toString()}</List.Description>
        </React.Fragment>
      );
    }
  }

  render() {
    const { editing } = this.props;
    return (
      <li className="programSequence-item ui form">
        {editing ? <Handle /> : <List.Icon name="caret right" />}
        <List.Content>{this.renderContent()}</List.Content>
      </li>
    );
  }

  private onSectionChange = (newSectionId: number) => {
    this.props.onChange(
      this.props.idx,
      new ProgramItem({
        ...this.props.sequenceItem,
        section: newSectionId
      })
    );
  };

  private onDurationChange = (newDuration: Duration) => {
    this.props.onChange(
      this.props.idx,
      new ProgramItem({
        ...this.props.sequenceItem,
        duration: newDuration.toSeconds()
      })
    );
  };

  private onRemove = () => {
    this.props.onRemove(this.props.idx);
  };
}

const ProgramSequenceItemD = SortableElement(ProgramSequenceItem);

// tslint:disable: no-shadowed-variable
const ProgramSequenceList = SortableContainer(
  observer(
    function ProgramSequenceList(props: {
      className: string;
      list: ProgramItem[];
      sections: Section[];
      editing: boolean;
      onChange: ItemChangeHandler;
      onRemove: ItemRemoveHandler;
    }) {
      const { className, list, sections, ...rest } = props;
      const listItems = list.map((item, index) => {
        const key = `item-${index}`;
        return (
          <ProgramSequenceItemD
            {...rest}
            key={key}
            sequenceItem={item}
            index={index}
            idx={index}
            sections={sections}
          />
        );
      });
      return <ul className={className}>{listItems}</ul>;
    }
  ),
);

@observer
class ProgramSequenceView extends React.Component<{
  sequence: ProgramItem[];
  sections: Section[];
  editing?: boolean;
}> {
  render() {
    const { sequence, sections } = this.props;
    const editing = this.props.editing || false;
    const className = classNames("programSequence", { editing });
    let addButton: React.ReactNode = null;
    if (editing) {
      addButton = (
        <Button onClick={this.addItem}>
          <Icon name="add" />
          Add item
        </Button>
      );
    }
    return (
      <div>
        <ProgramSequenceList
          className={className}
          useDragHandle
          helperClass="dragging"
          list={sequence}
          sections={sections}
          editing={editing}
          onChange={this.changeItem}
          onRemove={this.removeItem}
          onSortEnd={this.onSortEnd}
        />
        {addButton}
      </div>
    );
  }

  @action.bound
  private changeItem: ItemChangeHandler = (index, newItem) => {
    this.props.sequence[index] = newItem;
  };

  @action.bound
  private removeItem: ItemRemoveHandler = index => {
    this.props.sequence.splice(index, 1);
  };

  @action.bound
  private addItem() {
    let sectionId = 0;
    for (const section of this.props.sections) {
      const sectionNotIncluded = this.props.sequence.every(
        sequenceItem => sequenceItem.section !== section.id
      );
      if (sectionNotIncluded) {
        sectionId = section.id;
        break;
      }
    }
    const item = new ProgramItem({
      section: sectionId,
      duration: new Duration(5, 0).toSeconds()
    });
    this.props.sequence.push(item);
  }

  @action.bound
  private onSortEnd({ oldIndex, newIndex }: SortEnd) {
    const { sequence: array } = this.props;
    if (newIndex >= array.length) {
      return;
    }
    array.splice(newIndex, 0, array.splice(oldIndex, 1)[0]);
  }
}

const ProgramSequenceViewD = SortableContainer(ProgramSequenceView);
export default ProgramSequenceViewD;