import {
  CanvasElementType,
  DefaultTool,
  EXCLUDING_MOUSE_OUT_CLASS_LIST,
  type SurfaceBlockComponent,
} from '@blocksuite/affine-block-surface';
import type { ShapeElementModel, ShapeName } from '@blocksuite/affine-model';
import {
  DefaultTheme,
  getShapeType,
  ShapeType,
} from '@blocksuite/affine-model';
import {
  EditPropsStore,
  TelemetryProvider,
  ThemeProvider,
} from '@blocksuite/affine-shared/services';
import { hasClassNameInList } from '@blocksuite/affine-shared/utils';
import type { IBound } from '@blocksuite/global/gfx';
import { Bound } from '@blocksuite/global/gfx';
import type { PointerEventState } from '@blocksuite/std';
import { BaseTool, type GfxController } from '@blocksuite/std/gfx';
import { effect } from '@preact/signals-core';

import {
  SHAPE_OVERLAY_HEIGHT,
  SHAPE_OVERLAY_OPTIONS,
  SHAPE_OVERLAY_WIDTH,
} from './consts.js';
import { ShapeOverlay } from './overlay/shape-overlay.js';

export type ShapeToolOption = {
  shapeName: ShapeName;
};

export class ShapeTool extends BaseTool<ShapeToolOption> {
  static override toolName: string = 'shape';

  private _disableOverlay = false;

  private _draggingElement: ShapeElementModel | null = null;

  private _draggingElementId: string | null = null;

  // shape overlay
  private _shapeOverlay: ShapeOverlay | null = null;

  private get _surfaceComponent() {
    return this.gfx.surfaceComponent as SurfaceBlockComponent | null;
  }

  private _spacePressedCtx: {
    draggingArea: IBound & {
      endX: number;
      endY: number;
      startX: number;
      startY: number;
    };
  } | null = null;

  private _addNewShape(
    e: PointerEventState,
    width: number,
    height: number
  ): string {
    const { viewport } = this.gfx;
    const { shapeName } = this.activatedOption;
    const attributes =
      this.std.get(EditPropsStore).lastProps$.value[`shape:${shapeName}`];

    if (shapeName === 'roundedRect') {
      width += 40;
    }
    // create a shape block when drag start
    const [modelX, modelY] = viewport.toModelCoord(e.point.x, e.point.y);
    const bound = new Bound(modelX, modelY, width, height);

    const id = this.gfx.surface!.addElement({
      type: CanvasElementType.SHAPE,
      shapeType: getShapeType(shapeName),
      xywh: bound.serialize(),
      radius: attributes.radius,
    });

    this.std.getOptional(TelemetryProvider)?.track('CanvasElementAdded', {
      control: 'canvas:draw',
      page: 'whiteboard editor',
      module: 'toolbar',
      segment: 'toolbar',
      type: CanvasElementType.SHAPE,
      other: {
        shapeName,
      },
    });

    return id;
  }

  private _hideOverlay() {
    if (!this._shapeOverlay) return;
    this._shapeOverlay.globalAlpha = 0;
    this._surfaceComponent?.refresh();
  }

  private _resize(shiftPressed = false, spacePressed = false) {
    const { _draggingElement, _draggingElementId: id, controller } = this;
    if (!id || !_draggingElement) return;

    const draggingArea = this.controller.draggingArea$.peek();
    const { startX, startY } = draggingArea;
    let { endX, endY } = draggingArea;

    if (shiftPressed) {
      const w = Math.abs(endX - startX);
      const h = Math.abs(endY - startY);
      const m = Math.max(w, h);

      endX = startX + (endX > startX ? m : -m);
      endY = startY + (endY > startY ? m : -m);
    }

    if (spacePressed && this._spacePressedCtx) {
      const {
        w,
        h,
        startX,
        startY,
        endX: pressedX,
        endY: pressedY,
      } = this._spacePressedCtx.draggingArea;
      const { endX: lastX, endY: lastY } = controller.draggingArea$.peek();
      const dx = lastX - pressedX;
      const dy = lastY - pressedY;

      this.controller.draggingArea$.value = {
        x: Math.min(startX + dx, lastX),
        y: Math.min(startY + dy, lastY),
        w,
        h,
        endX: endX + dx,
        endY: endY + dy,
        startX: startX + dx,
        startY: startY + dy,
      };
    }

    const bound = new Bound(
      Math.min(startX, endX),
      Math.min(startY, endY),
      Math.abs(startX - endX),
      Math.abs(startY - endY)
    );

    this.gfx.updateElement(_draggingElement, {
      xywh: bound.serialize(),
    });
  }

  private _updateOverlayPosition(x: number, y: number) {
    if (!this._shapeOverlay) return;
    this._shapeOverlay.x = x;
    this._shapeOverlay.y = y;
    this._surfaceComponent?.refresh();
  }

  constructor(gfx: GfxController) {
    super(gfx);
    this.activatedOption = {
      shapeName: ShapeType.Rect,
    };
  }

  override activate() {
    this.createOverlay();
  }

  clearOverlay() {
    if (!this._shapeOverlay) return;

    this._shapeOverlay.dispose();

    this._surfaceComponent?.renderer.removeOverlay(this._shapeOverlay);
    this._shapeOverlay = null;

    this._surfaceComponent?.renderer.refresh();
  }

  override click(e: PointerEventState): void {
    this.clearOverlay();
    if (this._disableOverlay) return;

    this.doc.captureSync();

    const id = this._addNewShape(e, SHAPE_OVERLAY_WIDTH, SHAPE_OVERLAY_HEIGHT);

    const element = this.gfx.getElementById(id);
    if (!element) return;

    this.gfx.tool.setTool(DefaultTool);
    this.gfx.selection.set({
      elements: [element.id],
      editing: false,
    });
  }

  createOverlay() {
    this.clearOverlay();
    if (this._disableOverlay) return;
    const options = SHAPE_OVERLAY_OPTIONS;
    const { shapeName } = this.activatedOption;
    const attributes =
      this.std.get(EditPropsStore).lastProps$.value[`shape:${shapeName}`];

    options.stroke = this.std
      .get(ThemeProvider)
      .getColorValue(
        attributes.strokeColor,
        DefaultTheme.shapeStrokeColor,
        true
      );
    options.fill = this.std
      .get(ThemeProvider)
      .getColorValue(attributes.fillColor, DefaultTheme.shapeFillColor, true);

    switch (attributes.strokeStyle!) {
      case 'dash':
        options.strokeLineDash = [12, 12];
        break;
      case 'none':
        options.strokeLineDash = [];
        options.stroke = 'transparent';
        break;
      default:
        options.strokeLineDash = [];
    }
    this._shapeOverlay = new ShapeOverlay(this.gfx, shapeName, options, {
      shapeStyle: attributes.shapeStyle,
      fillColor: attributes.fillColor,
      strokeColor: attributes.strokeColor,
    });
    this._surfaceComponent?.renderer.addOverlay(this._shapeOverlay);
  }

  override deactivate() {
    this.clearOverlay();
  }

  override dragEnd() {
    if (this._disableOverlay) return;
    if (this._draggingElement) {
      const draggingElement = this._draggingElement;

      draggingElement.pop('xywh');
    }

    const id = this._draggingElementId;
    if (!id) return;
    const draggingArea = this.controller.draggingArea$.peek();

    if (draggingArea.w < 20 && draggingArea.h < 20) {
      this.gfx.deleteElement(id);
      return;
    }

    this._draggingElement = null;
    this._draggingElementId = null;

    this.doc.captureSync();

    const element = this.gfx.getElementById(id);
    if (!element) return;

    this.controller.setTool(DefaultTool);
    this.gfx.selection.set({
      elements: [element.id],
    });
  }

  override dragMove(e: PointerEventState) {
    if (this._disableOverlay || !this._draggingElementId) return;

    this._resize(
      e.keys.shift || this.gfx.keyboard.shiftKey$.peek(),
      this.gfx.keyboard.spaceKey$.peek()
    );
  }

  override dragStart(e: PointerEventState) {
    if (this._disableOverlay) return;
    this.clearOverlay();

    this.doc.captureSync();

    const id = this._addNewShape(e, 0, 0);

    this._spacePressedCtx = null;
    this._draggingElementId = id;
    this._draggingElement = this.gfx.getElementById(id) as ShapeElementModel;
    this._draggingElement.stash('xywh');
  }

  override mounted() {
    this.disposable.add(
      effect(() => {
        const pressed = this.gfx.keyboard.shiftKey$.value;
        if (!this._draggingElementId || !this.activate) {
          return;
        }

        this._resize(pressed);
      })
    );

    this.disposable.add(
      effect(() => {
        const spacePressed = this.gfx.keyboard.spaceKey$.value;

        if (spacePressed && this._draggingElementId) {
          this._spacePressedCtx = {
            draggingArea: this.controller.draggingArea$.peek(),
          };
        }
      })
    );
  }

  override pointerMove(e: PointerEventState) {
    if (!this._shapeOverlay) return;
    // shape options, like stroke color, fill color, etc.
    if (this._shapeOverlay.globalAlpha === 0)
      this._shapeOverlay.globalAlpha = 1;
    const [x, y] = this.gfx.viewport.toModelCoord(e.x, e.y);
    this._updateOverlayPosition(x, y);
  }

  override pointerOut(e: PointerEventState) {
    if (
      e.raw.relatedTarget &&
      hasClassNameInList(
        e.raw.relatedTarget as Element,
        EXCLUDING_MOUSE_OUT_CLASS_LIST
      )
    )
      return;
    this._hideOverlay();
  }

  setDisableOverlay(disable: boolean) {
    this._disableOverlay = disable;
  }

  cycleShapeName(dir: 'prev' | 'next' = 'next'): ShapeName {
    const shapeNames: ShapeName[] = [
      ShapeType.Rect,
      ShapeType.Ellipse,
      ShapeType.Diamond,
      ShapeType.Triangle,
      'roundedRect',
    ];

    const currentIndex = shapeNames.indexOf(this.activatedOption.shapeName);
    const nextIndex =
      (currentIndex + (dir === 'prev' ? -1 : 1) + shapeNames.length) %
      shapeNames.length;
    return shapeNames[nextIndex];
  }
}