/**
 * @license
 * Copyright 2019 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @fileoverview Zelos renderer.
 */
'use strict';

/**
 * Zelos renderer.
 * @class
 */
goog.module('Blockly.zelos.Drawer');

const debug = goog.require('Blockly.blockRendering.debug');
const svgPaths = goog.require('Blockly.utils.svgPaths');
/* eslint-disable-next-line no-unused-vars */
const {BlockSvg} = goog.requireType('Blockly.BlockSvg');
const {Drawer: BaseDrawer} = goog.require('Blockly.blockRendering.Drawer');
/* eslint-disable-next-line no-unused-vars */
const {PathObject} = goog.requireType('Blockly.zelos.PathObject');
/* eslint-disable-next-line no-unused-vars */
const {RenderInfo} = goog.requireType('Blockly.zelos.RenderInfo');
/* eslint-disable-next-line no-unused-vars */
const {Row} = goog.requireType('Blockly.blockRendering.Row');
/* eslint-disable-next-line no-unused-vars */
const {SpacerRow} = goog.requireType('Blockly.blockRendering.SpacerRow');
/* eslint-disable-next-line no-unused-vars */
const {StatementInput} = goog.requireType('Blockly.zelos.StatementInput');
/* eslint-disable-next-line no-unused-vars */
const {InsideCorners} = goog.requireType('Blockly.zelos.ConstantProvider');
/* eslint-disable-next-line no-unused-vars */
const {DynamicShape, Notch} = goog.requireType('Blockly.blockRendering.ConstantProvider');
const {Types} = goog.require('Blockly.blockRendering.Types');


/**
 * An object that draws a block based on the given rendering information.
 * @extends {BaseDrawer}
 * @alias Blockly.zelos.Drawer
 */
class Drawer extends BaseDrawer {
  /**
   * @param {!BlockSvg} block The block to render.
   * @param {!RenderInfo} info An object containing all
   *   information needed to render this block.
   * @package
   */
  constructor(block, info) {
    super(block, info);

    /**
     * @type {!RenderInfo}
     */
    this.info_;
  }

  /**
   * @override
   */
  draw() {
    const pathObject =
        /** @type {!PathObject} */ (this.block_.pathObject);
    pathObject.beginDrawing();
    this.hideHiddenIcons_();
    this.drawOutline_();
    this.drawInternals_();

    pathObject.setPath(this.outlinePath_ + '\n' + this.inlinePath_);
    if (this.info_.RTL) {
      pathObject.flipRTL();
    }
    if (debug.isDebuggerEnabled()) {
      this.block_.renderingDebugger.drawDebug(this.block_, this.info_);
    }
    this.recordSizeOnBlock_();
    if (this.info_.outputConnection) {
      // Store the output connection shape type for parent blocks to use during
      // rendering.
      pathObject.outputShapeType = this.info_.outputConnection.shape.type;
    }
    pathObject.endDrawing();
  }

  /**
   * @override
   */
  drawOutline_() {
    if (this.info_.outputConnection &&
        this.info_.outputConnection.isDynamicShape &&
        !this.info_.hasStatementInput &&
        !this.info_.bottomRow.hasNextConnection) {
      this.drawFlatTop_();
      this.drawRightDynamicConnection_();
      this.drawFlatBottom_();
      this.drawLeftDynamicConnection_();
    } else {
      super.drawOutline_();
    }
  }

  /**
   * @override
   */
  drawLeft_() {
    if (this.info_.outputConnection &&
        this.info_.outputConnection.isDynamicShape) {
      this.drawLeftDynamicConnection_();
    } else {
      super.drawLeft_();
    }
  }

  /**
   * Add steps for the right side of a row that does not have value or
   * statement input connections.
   * @param {!Row} row The row to draw the
   *     side of.
   * @protected
   */
  drawRightSideRow_(row) {
    if (row.height <= 0) {
      return;
    }
    if (Types.isSpacer(row)) {
      const spacerRow = /** @type {!SpacerRow} */ (row);
      if (spacerRow.precedesStatement || spacerRow.followsStatement) {
        const cornerHeight =
            (/** @type {!InsideCorners} */ (this.constants_.INSIDE_CORNERS))
                .rightHeight;
        const remainingHeight =
            spacerRow.height - (spacerRow.precedesStatement ? cornerHeight : 0);
        this.outlinePath_ +=
            (spacerRow.followsStatement ? (/** @type {!InsideCorners} */ (
                                               this.constants_.INSIDE_CORNERS))
                                              .pathBottomRight :
                                          '') +
            (remainingHeight > 0 ?
                 svgPaths.lineOnAxis('V', spacerRow.yPos + remainingHeight) :
                 '') +
            (spacerRow.precedesStatement ? (/** @type {!InsideCorners} */ (
                                                this.constants_.INSIDE_CORNERS))
                                               .pathTopRight :
                                           '');
        return;
      }
    }
    this.outlinePath_ += svgPaths.lineOnAxis('V', row.yPos + row.height);
  }

  /**
   * Add steps to draw the right side of an output with a dynamic connection.
   * @protected
   */
  drawRightDynamicConnection_() {
    this.outlinePath_ +=
        (/** @type {!DynamicShape} */ (this.info_.outputConnection.shape))
            .pathRightDown(this.info_.outputConnection.height);
  }

  /**
   * Add steps to draw the left side of an output with a dynamic connection.
   * @protected
   */
  drawLeftDynamicConnection_() {
    this.positionOutputConnection_();

    this.outlinePath_ +=
        (/** @type {!DynamicShape} */ (this.info_.outputConnection.shape))
            .pathUp(this.info_.outputConnection.height);

    // Close off the path.  This draws a vertical line up to the start of the
    // block's path, which may be either a rounded or a sharp corner.
    this.outlinePath_ += 'z';
  }

  /**
   * Add steps to draw a flat top row.
   * @protected
   */
  drawFlatTop_() {
    const topRow = this.info_.topRow;
    this.positionPreviousConnection_();

    this.outlinePath_ += svgPaths.moveBy(topRow.xPos, this.info_.startY);

    this.outlinePath_ += svgPaths.lineOnAxis('h', topRow.width);
  }

  /**
   * Add steps to draw a flat bottom row.
   * @protected
   */
  drawFlatBottom_() {
    const bottomRow = this.info_.bottomRow;
    this.positionNextConnection_();

    this.outlinePath_ += svgPaths.lineOnAxis('V', bottomRow.baseline);

    this.outlinePath_ += svgPaths.lineOnAxis('h', -bottomRow.width);
  }

  /**
   * @override
   */
  drawInlineInput_(input) {
    this.positionInlineInputConnection_(input);

    const inputName = input.input.name;
    if (input.connectedBlock || this.info_.isInsertionMarker) {
      return;
    }

    const width = input.width - (input.connectionWidth * 2);
    const height = input.height;
    const yPos = input.centerline - height / 2;

    const connectionRight = input.xPos + input.connectionWidth;

    const outlinePath = svgPaths.moveTo(connectionRight, yPos) +
        svgPaths.lineOnAxis('h', width) +
        (/** @type {!DynamicShape} */ (input.shape))
            .pathRightDown(input.height) +
        svgPaths.lineOnAxis('h', -width) +
        (/** @type {!DynamicShape} */ (input.shape)).pathUp(input.height) + 'z';
    const pathObject = /** @type {!PathObject} */ (this.block_.pathObject);
    pathObject.setOutlinePath(inputName, outlinePath);
  }

  /**
   * @override
   */
  drawStatementInput_(row) {
    const input = /** @type {!StatementInput} */ (row.getLastInput());
    // Where to start drawing the notch, which is on the right side in LTR.
    const x = input.xPos + input.notchOffset + input.shape.width;

    const innerTopLeftCorner = (/** @type {!Notch} */ (input.shape)).pathRight +
        svgPaths.lineOnAxis(
            'h', -(input.notchOffset - this.constants_.INSIDE_CORNERS.width)) +
        this.constants_.INSIDE_CORNERS.pathTop;

    const innerHeight =
        row.height - (2 * this.constants_.INSIDE_CORNERS.height);

    const innerBottomLeftCorner = this.constants_.INSIDE_CORNERS.pathBottom +
        svgPaths.lineOnAxis(
            'h', (input.notchOffset - this.constants_.INSIDE_CORNERS.width)) +
        (input.connectedBottomNextConnection ?
             '' :
             (/** @type {!Notch} */ (input.shape)).pathLeft);

    this.outlinePath_ += svgPaths.lineOnAxis('H', x) + innerTopLeftCorner +
        svgPaths.lineOnAxis('v', innerHeight) + innerBottomLeftCorner +
        svgPaths.lineOnAxis('H', row.xPos + row.width);

    this.positionStatementInputConnection_(row);
  }
}

exports.Drawer = Drawer;