/**
 * @license
 * Copyright 2013 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @fileoverview Angle input field.
 */

/**
 * Angle input field.
 * @class
 */
import * as goog from '../closure/goog/goog.js';
goog.declareModuleId('Blockly.FieldAngle');

import {BlockSvg} from './block_svg.js';
import * as browserEvents from './browser_events.js';
import * as Css from './css.js';
import * as dropDownDiv from './dropdowndiv.js';
import {Field} from './field.js';
import * as fieldRegistry from './field_registry.js';
import {FieldTextInput} from './field_textinput.js';
import * as dom from './utils/dom.js';
import {KeyCodes} from './utils/keycodes.js';
import * as math from './utils/math.js';
import type {Sentinel} from './utils/sentinel.js';
import {Svg} from './utils/svg.js';
import * as userAgent from './utils/useragent.js';
import * as WidgetDiv from './widgetdiv.js';


/**
 * Class for an editable angle field.
 * @alias Blockly.FieldAngle
 */
export class FieldAngle extends FieldTextInput {
  /** The default value for this field. */
  // protected override DEFAULT_VALUE = 0;

  /**
   * The default amount to round angles to when using a mouse or keyboard nav
   * input. Must be a positive integer to support keyboard navigation.
   */
  static readonly ROUND = 15;

  /** Half the width of protractor image. */
  static readonly HALF = 100 / 2;

  /**
   * Default property describing which direction makes an angle field's value
   * increase. Angle increases clockwise (true) or counterclockwise (false).
   */
  static readonly CLOCKWISE = false;

  /**
   * The default offset of 0 degrees (and all angles). Always offsets in the
   * counterclockwise direction, regardless of the field's clockwise property.
   * Usually either 0 (0 = right) or 90 (0 = up).
   */
  static readonly OFFSET = 0;

  /**
   * The default maximum angle to allow before wrapping.
   * Usually either 360 (for 0 to 359.9) or 180 (for -179.9 to 180).
   */
  static readonly WRAP = 360;

  /**
   * Radius of protractor circle.  Slightly smaller than protractor size since
   * otherwise SVG crops off half the border at the edges.
   */
  static readonly RADIUS: number = FieldAngle.HALF - 1;
  private clockwise_: boolean;
  private offset_: number;
  private wrap_: number;
  private round_: number;

  /** The angle picker's SVG element. */
  private editor_: SVGElement|null = null;

  /** The angle picker's gauge path depending on the value. */
  gauge_: SVGElement|null = null;

  /** The angle picker's line drawn representing the value's angle. */
  line_: SVGElement|null = null;

  /** The degree symbol for this field. */
  // AnyDuringMigration because:  Type 'null' is not assignable to type
  // 'SVGTSpanElement'.
  protected symbol_: SVGTSpanElement = null as AnyDuringMigration;

  /** Wrapper click event data. */
  private clickWrapper_: browserEvents.Data|null = null;

  /** Surface click event data. */
  private clickSurfaceWrapper_: browserEvents.Data|null = null;

  /** Surface mouse move event data. */
  private moveSurfaceWrapper_: browserEvents.Data|null = null;

  /**
   * Serializable fields are saved by the serializer, non-serializable fields
   * are not. Editable fields should also be serializable.
   */
  override SERIALIZABLE = true;

  /**
   * @param opt_value The initial value of the field. Should cast to a number.
   *     Defaults to 0. Also accepts Field.SKIP_SETUP if you wish to skip setup
   *     (only used by subclasses that want to handle configuration and setting
   *     the field value after their own constructors have run).
   * @param opt_validator A function that is called to validate changes to the
   *     field's value. Takes in a number & returns a validated number, or null
   *     to abort the change.
   * @param opt_config A map of options used to configure the field.
   *     See the [field creation documentation]{@link
   * https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/angle#creation}
   * for a list of properties this parameter supports.
   */
  constructor(
      opt_value?: string|number|Sentinel, opt_validator?: Function,
      opt_config?: AnyDuringMigration) {
    super(Field.SKIP_SETUP);

    /**
     * Should the angle increase as the angle picker is moved clockwise (true)
     * or counterclockwise (false)
     * @see FieldAngle.CLOCKWISE
     */
    this.clockwise_ = FieldAngle.CLOCKWISE;

    /**
     * The offset of zero degrees (and all other angles).
     * @see FieldAngle.OFFSET
     */
    this.offset_ = FieldAngle.OFFSET;

    /**
     * The maximum angle to allow before wrapping.
     * @see FieldAngle.WRAP
     */
    this.wrap_ = FieldAngle.WRAP;

    /**
     * The amount to round angles to when using a mouse or keyboard nav input.
     * @see FieldAngle.ROUND
     */
    this.round_ = FieldAngle.ROUND;

    if (opt_value === Field.SKIP_SETUP) {
      return;
    }
    if (opt_config) {
      this.configure_(opt_config);
    }
    this.setValue(opt_value);
    if (opt_validator) {
      this.setValidator(opt_validator);
    }
  }

  /**
   * Configure the field based on the given map of options.
   * @param config A map of options to configure the field based on.
   */
  override configure_(config: AnyDuringMigration) {
    super.configure_(config);

    switch (config['mode']) {
      case 'compass':
        this.clockwise_ = true;
        this.offset_ = 90;
        break;
      case 'protractor':
        // This is the default mode, so we could do nothing. But just to
        // future-proof, we'll set it anyway.
        this.clockwise_ = false;
        this.offset_ = 0;
        break;
    }

    // Allow individual settings to override the mode setting.
    const clockwise = config['clockwise'];
    if (typeof clockwise === 'boolean') {
      this.clockwise_ = clockwise;
    }

    // If these are passed as null then we should leave them on the default.
    let offset = config['offset'];
    if (offset !== null) {
      offset = Number(offset);
      if (!isNaN(offset)) {
        this.offset_ = offset;
      }
    }
    let wrap = config['wrap'];
    if (wrap !== null) {
      wrap = Number(wrap);
      if (!isNaN(wrap)) {
        this.wrap_ = wrap;
      }
    }
    let round = config['round'];
    if (round !== null) {
      round = Number(round);
      if (!isNaN(round)) {
        this.round_ = round;
      }
    }
  }

  /**
   * Create the block UI for this field.
   * @internal
   */
  override initView() {
    super.initView();
    // Add the degree symbol to the left of the number, even in RTL (issue
    // #2380)
    this.symbol_ = dom.createSvgElement(Svg.TSPAN, {});
    this.symbol_.appendChild(document.createTextNode('\u00B0'));
    this.textElement_.appendChild(this.symbol_);
  }

  /** Updates the graph when the field rerenders. */
  protected override render_() {
    super.render_();
    this.updateGraph_();
  }

  /**
   * Create and show the angle field's editor.
   * @param opt_e Optional mouse event that triggered the field to open, or
   *     undefined if triggered programmatically.
   */
  protected override showEditor_(opt_e?: Event) {
    // Mobile browsers have issues with in-line textareas (focus & keyboards).
    const noFocus = userAgent.MOBILE || userAgent.ANDROID || userAgent.IPAD;
    super.showEditor_(opt_e, noFocus);

    this.dropdownCreate_();
    // AnyDuringMigration because:  Argument of type 'SVGElement | null' is not
    // assignable to parameter of type 'Node'.
    dropDownDiv.getContentDiv().appendChild(this.editor_ as AnyDuringMigration);

    if (this.sourceBlock_ instanceof BlockSvg) {
      dropDownDiv.setColour(
          this.sourceBlock_.style.colourPrimary,
          this.sourceBlock_.style.colourTertiary);
    }

    // AnyDuringMigration because:  Argument of type 'this' is not assignable to
    // parameter of type 'Field'.
    dropDownDiv.showPositionedByField(
        this as AnyDuringMigration, this.dropdownDispose_.bind(this));

    this.updateGraph_();
  }

  /** Create the angle dropdown editor. */
  private dropdownCreate_() {
    const svg = dom.createSvgElement(Svg.SVG, {
      'xmlns': dom.SVG_NS,
      'xmlns:html': dom.HTML_NS,
      'xmlns:xlink': dom.XLINK_NS,
      'version': '1.1',
      'height': FieldAngle.HALF * 2 + 'px',
      'width': FieldAngle.HALF * 2 + 'px',
      'style': 'touch-action: none',
    });
    const circle = dom.createSvgElement(
        Svg.CIRCLE, {
          'cx': FieldAngle.HALF,
          'cy': FieldAngle.HALF,
          'r': FieldAngle.RADIUS,
          'class': 'blocklyAngleCircle',
        },
        svg);
    this.gauge_ =
        dom.createSvgElement(Svg.PATH, {'class': 'blocklyAngleGauge'}, svg);
    this.line_ = dom.createSvgElement(
        Svg.LINE, {
          'x1': FieldAngle.HALF,
          'y1': FieldAngle.HALF,
          'class': 'blocklyAngleLine',
        },
        svg);
    // Draw markers around the edge.
    for (let angle = 0; angle < 360; angle += 15) {
      dom.createSvgElement(
          Svg.LINE, {
            'x1': FieldAngle.HALF + FieldAngle.RADIUS,
            'y1': FieldAngle.HALF,
            'x2': FieldAngle.HALF + FieldAngle.RADIUS -
                (angle % 45 === 0 ? 10 : 5),
            'y2': FieldAngle.HALF,
            'class': 'blocklyAngleMarks',
            'transform': 'rotate(' + angle + ',' + FieldAngle.HALF + ',' +
                FieldAngle.HALF + ')',
          },
          svg);
    }

    // The angle picker is different from other fields in that it updates on
    // mousemove even if it's not in the middle of a drag.  In future we may
    // change this behaviour.
    this.clickWrapper_ =
        browserEvents.conditionalBind(svg, 'click', this, this.hide_);
    // On touch devices, the picker's value is only updated with a drag. Add
    // a click handler on the drag surface to update the value if the surface
    // is clicked.
    this.clickSurfaceWrapper_ = browserEvents.conditionalBind(
        circle, 'click', this, this.onMouseMove_, true, true);
    this.moveSurfaceWrapper_ = browserEvents.conditionalBind(
        circle, 'mousemove', this, this.onMouseMove_, true, true);
    this.editor_ = svg;
  }

  /** Disposes of events and DOM-references belonging to the angle editor. */
  private dropdownDispose_() {
    if (this.clickWrapper_) {
      browserEvents.unbind(this.clickWrapper_);
      this.clickWrapper_ = null;
    }
    if (this.clickSurfaceWrapper_) {
      browserEvents.unbind(this.clickSurfaceWrapper_);
      this.clickSurfaceWrapper_ = null;
    }
    if (this.moveSurfaceWrapper_) {
      browserEvents.unbind(this.moveSurfaceWrapper_);
      this.moveSurfaceWrapper_ = null;
    }
    this.gauge_ = null;
    this.line_ = null;
  }

  /** Hide the editor. */
  private hide_() {
    dropDownDiv.hideIfOwner(this);
    WidgetDiv.hide();
  }

  /**
   * Set the angle to match the mouse's position.
   * @param e Mouse move event.
   */
  protected onMouseMove_(e: Event) {
    // Calculate angle.
    const bBox = this.gauge_!.ownerSVGElement!.getBoundingClientRect();
    // AnyDuringMigration because:  Property 'clientX' does not exist on type
    // 'Event'.
    const dx = (e as AnyDuringMigration).clientX - bBox.left - FieldAngle.HALF;
    // AnyDuringMigration because:  Property 'clientY' does not exist on type
    // 'Event'.
    const dy = (e as AnyDuringMigration).clientY - bBox.top - FieldAngle.HALF;
    let angle = Math.atan(-dy / dx);
    if (isNaN(angle)) {
      // This shouldn't happen, but let's not let this error propagate further.
      return;
    }
    angle = math.toDegrees(angle);
    // 0: East, 90: North, 180: West, 270: South.
    if (dx < 0) {
      angle += 180;
    } else if (dy > 0) {
      angle += 360;
    }

    // Do offsetting.
    if (this.clockwise_) {
      angle = this.offset_ + 360 - angle;
    } else {
      angle = 360 - (this.offset_ - angle);
    }

    this.displayMouseOrKeyboardValue_(angle);
  }

  /**
   * Handles and displays values that are input via mouse or arrow key input.
   * These values need to be rounded and wrapped before being displayed so
   * that the text input's value is appropriate.
   * @param angle New angle.
   */
  private displayMouseOrKeyboardValue_(angle: number) {
    if (this.round_) {
      angle = Math.round(angle / this.round_) * this.round_;
    }
    angle = this.wrapValue_(angle);
    if (angle !== this.value_) {
      this.setEditorValue_(angle);
    }
  }

  /** Redraw the graph with the current angle. */
  private updateGraph_() {
    if (!this.gauge_) {
      return;
    }
    // Always display the input (i.e. getText) even if it is invalid.
    let angleDegrees = Number(this.getText()) + this.offset_;
    angleDegrees %= 360;
    let angleRadians = math.toRadians(angleDegrees);
    const path = ['M ', FieldAngle.HALF, ',', FieldAngle.HALF];
    let x2 = FieldAngle.HALF;
    let y2 = FieldAngle.HALF;
    if (!isNaN(angleRadians)) {
      const clockwiseFlag = Number(this.clockwise_);
      const angle1 = math.toRadians(this.offset_);
      const x1 = Math.cos(angle1) * FieldAngle.RADIUS;
      const y1 = Math.sin(angle1) * -FieldAngle.RADIUS;
      if (clockwiseFlag) {
        angleRadians = 2 * angle1 - angleRadians;
      }
      x2 += Math.cos(angleRadians) * FieldAngle.RADIUS;
      y2 -= Math.sin(angleRadians) * FieldAngle.RADIUS;
      // Don't ask how the flag calculations work.  They just do.
      let largeFlag =
          Math.abs(Math.floor((angleRadians - angle1) / Math.PI) % 2);
      if (clockwiseFlag) {
        largeFlag = 1 - largeFlag;
      }
      path.push(
          ' l ', x1, ',', y1, ' A ', FieldAngle.RADIUS, ',', FieldAngle.RADIUS,
          ' 0 ', largeFlag, ' ', clockwiseFlag, ' ', x2, ',', y2, ' z');
    }
    this.gauge_.setAttribute('d', path.join(''));
    // AnyDuringMigration because:  Argument of type 'number' is not assignable
    // to parameter of type 'string'.
    this.line_!.setAttribute('x2', x2 as AnyDuringMigration);
    // AnyDuringMigration because:  Argument of type 'number' is not assignable
    // to parameter of type 'string'.
    this.line_!.setAttribute('y2', y2 as AnyDuringMigration);
  }

  /**
   * Handle key down to the editor.
   * @param e Keyboard event.
   */
  protected override onHtmlInputKeyDown_(e: Event) {
    super.onHtmlInputKeyDown_(e);

    let multiplier;
    // AnyDuringMigration because:  Property 'keyCode' does not exist on type
    // 'Event'.
    if ((e as AnyDuringMigration).keyCode === KeyCodes.LEFT) {
      // decrement (increment in RTL)
      multiplier = this.sourceBlock_.RTL ? 1 : -1;
      // AnyDuringMigration because:  Property 'keyCode' does not exist on type
      // 'Event'.
    } else if ((e as AnyDuringMigration).keyCode === KeyCodes.RIGHT) {
      // increment (decrement in RTL)
      multiplier = this.sourceBlock_.RTL ? -1 : 1;
      // AnyDuringMigration because:  Property 'keyCode' does not exist on type
      // 'Event'.
    } else if ((e as AnyDuringMigration).keyCode === KeyCodes.DOWN) {
      // decrement
      multiplier = -1;
      // AnyDuringMigration because:  Property 'keyCode' does not exist on type
      // 'Event'.
    } else if ((e as AnyDuringMigration).keyCode === KeyCodes.UP) {
      // increment
      multiplier = 1;
    }
    if (multiplier) {
      const value = this.getValue() as number;
      this.displayMouseOrKeyboardValue_(value + multiplier * this.round_);
      e.preventDefault();
      e.stopPropagation();
    }
  }

  /**
   * Ensure that the input value is a valid angle.
   * @param opt_newValue The input value.
   * @return A valid angle, or null if invalid.
   */
  protected override doClassValidation_(opt_newValue?: AnyDuringMigration):
      number|null {
    const value = Number(opt_newValue);
    if (isNaN(value) || !isFinite(value)) {
      return null;
    }
    return this.wrapValue_(value);
  }

  /**
   * Wraps the value so that it is in the range (-360 + wrap, wrap).
   * @param value The value to wrap.
   * @return The wrapped value.
   */
  private wrapValue_(value: number): number {
    value %= 360;
    if (value < 0) {
      value += 360;
    }
    if (value > this.wrap_) {
      value -= 360;
    }
    return value;
  }

  /**
   * Construct a FieldAngle from a JSON arg object.
   * @param options A JSON object with options (angle).
   * @return The new field instance.
   * @nocollapse
   * @internal
   */
  static override fromJson(options: AnyDuringMigration): FieldAngle {
    // `this` might be a subclass of FieldAngle if that class doesn't override
    // the static fromJson method.
    return new this(options['angle'], undefined, options);
  }
}

/** CSS for angle field.  See css.js for use. */
Css.register(`
.blocklyAngleCircle {
  stroke: #444;
  stroke-width: 1;
  fill: #ddd;
  fill-opacity: .8;
}

.blocklyAngleMarks {
  stroke: #444;
  stroke-width: 1;
}

.blocklyAngleGauge {
  fill: #f88;
  fill-opacity: .8;
  pointer-events: none;
}

.blocklyAngleLine {
  stroke: #f00;
  stroke-width: 2;
  stroke-linecap: round;
  pointer-events: none;
}
`);

fieldRegistry.register('field_angle', FieldAngle);

(FieldAngle.prototype as AnyDuringMigration).DEFAULT_VALUE = 0;