import React = require('react');
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { action, ObservableMap, ObservableSet } from 'mobx';
import { observer } from 'mobx-react';
import { Doc } from '../../../../fields/Doc';
import { undoBatch } from '../../../util/UndoManager';
import { ViewBoxBaseComponent } from '../../DocComponent';
import { Colors } from '../../global/globalEnums';
import { FieldView, FieldViewProps } from '../../nodes/FieldView';
import './CollectionSchemaView.scss';
import { SchemaTableCell } from './SchemaTableCell';
import { emptyFunction, setupMoveUpEvents } from '../../../../Utils';
import { DragManager } from '../../../util/DragManager';

export interface SchemaRowBoxProps extends FieldViewProps {
    rowIndex: number;
    columnKeys: string[];
    columnWidths: number[];
    rowMenuWidth: number;
    selectedRows: ObservableSet<Doc>;
    selectRow: (e: any, doc: Doc, index: number) => void;
    startDrag: (e: any, doc: Doc) => boolean;
    dragging: boolean;
    dropIndex: (index: number) => void;
}

@observer
export class SchemaRowBox extends ViewBoxBaseComponent<SchemaRowBoxProps>() {
    public static LayoutString(fieldKey: string) {
        return FieldView.LayoutString(SchemaRowBox, fieldKey);
    }

    private _ref: HTMLDivElement | null = null;

    isSelected = () => this.props.selectedRows.has(this.props.Document);
    bounds = () => this._ref?.getBoundingClientRect();

    @action
    onRowPointerDown = (e: React.PointerEvent) => {
        e.stopPropagation();

        setupMoveUpEvents(
            this,
            e,
            e => this.props.startDrag(e, this.props.Document),
            emptyFunction,
            e => this.props.selectRow(e, this.props.Document, this.props.rowIndex)
        );
    };

    onPointerEnter = (e: any) => {
        if (!this.props.dragging) return;
        document.removeEventListener('pointermove', this.onPointerMove);
        document.addEventListener('pointermove', this.onPointerMove);
    };

    onPointerMove = (e: any) => {
        if (!this.props.dragging) return;
        let dragIsRow: boolean = true;
        DragManager.docsBeingDragged.forEach(doc => {
            dragIsRow = this.props.selectedRows.has(doc);
        });
        if (this._ref && dragIsRow) {
            const rect = this._ref.getBoundingClientRect();
            const y = e.clientY - rect.top; //y position within the element.
            const height = this._ref.clientHeight;
            const halfLine = height / 2;
            if (y <= halfLine) {
                this._ref.style.borderTop = `solid 2px ${Colors.MEDIUM_BLUE}`;
                this._ref.style.borderBottom = '0px';
                this.props.dropIndex(this.props.rowIndex);
            } else if (y > halfLine) {
                this._ref.style.borderTop = '0px';
                this._ref.style.borderBottom = `solid 2px ${Colors.MEDIUM_BLUE}`;
                this.props.dropIndex(this.props.rowIndex + 1);
            }
        }
    };

    onPointerLeave = (e: any) => {
        if (this._ref) {
            this._ref.style.borderTop = '0px';
            this._ref.style.borderBottom = '0px';
        }
        document.removeEventListener('pointermove', this.onPointerMove);
    };

    render() {
        return (
            <div
                className="schema-row"
                style={this.isSelected() ? { backgroundColor: Colors.LIGHT_BLUE, opacity: this.props.dragging ? 0.5 : 1 } : {}}
                onPointerDown={this.onRowPointerDown}
                onPointerEnter={this.onPointerEnter}
                onPointerLeave={this.onPointerLeave}
                ref={(row: HTMLDivElement | null) => (this._ref = row)}>
                <div className="row-menu" style={{ width: this.props.rowMenuWidth }}>
                    <div
                        className="row-button"
                        onPointerDown={undoBatch(e => {
                            e.stopPropagation();
                            this.props.removeDocument?.(this.props.Document);
                        })}>
                        <FontAwesomeIcon icon="times" />
                    </div>
                    <div
                        className="row-button"
                        onPointerDown={e => {
                            e.stopPropagation();
                            this.props.addDocTab(this.props.Document, 'add:right');
                        }}>
                        <FontAwesomeIcon icon="external-link-alt" />
                    </div>
                </div>
                <div className="row-cells">
                    {this.props.columnKeys.map((key, index) => (
                        <SchemaTableCell Document={this.props.Document} fieldKey={key} columnWidth={this.props.columnWidths[index]} />
                    ))}
                </div>
            </div>
        );
    }
}