import { dataService } from "../Service/DataService.js";
import { stateService } from "../Service/StateService.js";
import { coordinate } from "../Coordinate.js";
import Style from "@/graphic/CanvasStyle/index.js";
import VectorType from "../enum/VectorType.js";
import { mathUtil } from "../Util/MathUtil.js";
import ElementEvents from "../enum/ElementEvents.js";
import { elementService } from "../Service/ElementService.js";

const help = {
  getVectorStyle(vector, geoType = vector.geoType) {
    const geoId = vector?.vectorId;
    if (!geoId) {
      return Style[geoType];
    }

    const itemsEntry = [
      [stateService.getSelectItem(), "Select"],
      [stateService.getDraggingItem(), "Dragging"],
      [stateService.getFocusItem(), "Focus"],
    ];

    return itemsEntry.reduce((prev, [item, attr]) => {
      if (
        item &&
        item.type === VectorType[geoType] &&
        geoId === item.vectorId
      ) {
        if (Style[attr] && Style[attr][geoType]) {
          return Style[attr][geoType];
        }
      }
      return prev;
    }, Style[geoType]);
  },
  setVectorStyle(ctx, vector, geoType = vector.geoType) {
    const styles = help.getVectorStyle(vector, geoType);
    for (const style in styles) {
      if (typeof styles[style] === "function") {
        styles[style](ctx, vector);
      } else {
        ctx[style] = styles[style];
      }
    }
    return styles;
  },
  transformCoves(lines) {
    return lines.map((line) =>
      line.map((line) => ({
        start: coordinate.getScreenXY(line.start),
        end: coordinate.getScreenXY(line.end),
        controls: line.controls.map(coordinate.getScreenXY.bind(coordinate)),
      }))
    );
  },
  drawCoves(ctx, coves) {
    for (const curve of coves) {
      ctx.beginPath();
      ctx.moveTo(curve.start.x, curve.start.y);
      if (curve.controls.length === 1) {
        ctx.quadraticCurveTo(
          curve.controls[0].x,
          curve.controls[0].y,
          curve.end.x,
          curve.end.y
        );
      } else {
        ctx.bezierCurveTo(
          curve.controls[0].x,
          curve.controls[0].y,
          curve.controls[1].x,
          curve.controls[1].y,
          curve.end.x,
          curve.end.y
        );
      }
      ctx.stroke();
    }
  },
};

export default class Draw {
  constructor() {
    this.context = null;
  }

  initContext(canvas) {
    if (canvas) {
      this.context = canvas.getContext("2d");
    } else {
      this.context = null;
    }
  }

  clear() {
    this.context.clearRect(
      0,
      0,
      this.context.canvas.width,
      this.context.canvas.height
    );
  }

  drawBackGroundImg(vector) {
    this.context.save();

    this.context.restore();
  }

  drawGrid(startX, startY, w, h, step1, step2) {
    this.context.save();
    this.context.beginPath();
    for (var x = startX; x <= w; x += step1) {
      this.context.moveTo(x, 0);
      this.context.lineTo(x, h);
    }

    for (var y = startY; y <= h; y += step1) {
      this.context.moveTo(0, y);
      this.context.lineTo(w, y);
    }
    this.context.strokeStyle = "rgba(0,0,0,0.1)";
    this.context.lineWidth = 0.5;
    this.context.stroke();

    this.context.beginPath();
    for (var x = startX; x <= w; x += step2) {
      this.context.moveTo(x, 0);
      this.context.lineTo(x, h);
    }

    for (var y = startY; y <= h; y += step2) {
      this.context.moveTo(0, y);
      this.context.lineTo(w, y);
    }
    this.context.strokeStyle = "rgba(0,0,0,0.2)";
    this.context.lineWidth = 1;
    this.context.stroke();
    this.context.restore();
  }

  drawRoad(vector, isTemp) {
    console.log(vector);
    if (!isTemp && vector.display && vector.way !== "oneWay") {
      const ctx = this.context;
      const draw = (midDivide) => {
        const startScreen = coordinate.getScreenXY(midDivide.start);
        const endScreen = coordinate.getScreenXY(midDivide.end);
        ctx.beginPath();
        ctx.moveTo(startScreen.x, startScreen.y);
        ctx.lineTo(endScreen.x, endScreen.y);
        ctx.stroke();
      };

      ctx.save();
      help.setVectorStyle(ctx, vector);
      vector.midDivide.leftMidDivide && draw(vector.midDivide.leftMidDivide);
      vector.midDivide.rightMidDivide && draw(vector.midDivide.rightMidDivide);
      ctx.restore();
    }

    if (import.meta.env.DEV && !isTemp) {
      const startReal = isTemp
        ? vector.start
        : dataService.getRoadPoint(vector.startId);
      const endReal = isTemp
        ? vector.end
        : dataService.getRoadPoint(vector.endId);
      this.drawText(
        { x: (startReal.x + endReal.x) / 2, y: (startReal.y + endReal.y) / 2 },
        vector.vectorId
      );
    }
    this.drawRoadEdge(vector, isTemp);
    vector.leftLanes && vector.leftLanes.forEach(this.drawLan.bind(this));
    vector.rightLanes && vector.rightLanes.forEach(this.drawLan.bind(this));
  }

  drawLan(lan) {
    const ctx = this.context;
    const start = coordinate.getScreenXY(lan.start);
    const end = coordinate.getScreenXY(lan.end);
    ctx.save();
    ctx.beginPath();
    help.setVectorStyle(ctx, null, "Lane");
    ctx.setLineDash(Style.Lane.dash);
    ctx.moveTo(start.x, start.y);
    ctx.lineTo(end.x, end.y);
    ctx.stroke();
    ctx.restore();

    if (import.meta.env.DEV) {
      this.drawPoint(lan.start);
      this.drawPoint(lan.end);
    }
  }

  drawRoadEdge(vector, isTemp) {
    //判断是否与road方向一致。角度足够小，路足够宽，有可能向量方向不一致
    const start = isTemp
      ? vector.start
      : dataService.getRoadPoint(vector.startId);
    const end = isTemp ? vector.end : dataService.getRoadPoint(vector.endId);

    const drawRoadEdgeChild = (edgeVector) => {
      const flag = mathUtil.isSameDirForVector(
        start,
        end,
        edgeVector.start,
        edgeVector.end
      );

      if (flag) {
        ctx.beginPath();
        const point1 = coordinate.getScreenXY(edgeVector.start);
        const point2 = coordinate.getScreenXY(edgeVector.end);
        ctx.moveTo(point1.x, point1.y);
        ctx.lineTo(point2.x, point2.y);
        ctx.stroke();
      }
      this.drawText(
        {
          x: (edgeVector.start.x + edgeVector.end.x) / 2,
          y: (edgeVector.start.y + edgeVector.end.y) / 2,
        },
        edgeVector.vectorId
      );
    };

    const leftEdge = isTemp
      ? vector.leftEdge
      : dataService.getRoadEdge(vector.leftEdgeId);
    const rightEdge = isTemp
      ? vector.rightEdge
      : dataService.getRoadEdge(vector.rightEdgeId);
    const ctx = this.context;
    ctx.save();
    isTemp && (ctx.globalAlpha = 0.3);
    help.setVectorStyle(ctx, leftEdge);
    drawRoadEdgeChild(leftEdge);
    help.setVectorStyle(ctx, rightEdge);
    drawRoadEdgeChild(rightEdge);
    ctx.restore();

    if (import.meta.env.DEV) {
      this.drawPoint(leftEdge.start);
      this.drawPoint(leftEdge.end);
      this.drawPoint(rightEdge.start);
      this.drawPoint(rightEdge.end);
    }
  }

  drawControlPoint(vector) {
    const start = coordinate.getScreenXY(
      dataService
        .getRoadEdge(vector.edgeInfo1.id)
        .getPosition(vector.edgeInfo1.dir)
    );
    const end = coordinate.getScreenXY(
      dataService
        .getRoadEdge(vector.edgeInfo2.id)
        .getPosition(vector.edgeInfo2.dir)
    );
    const pt2 = mathUtil.twoOrderBezier(
      0.5,
      start,
      coordinate.getScreenXY({ x: vector.x, y: vector.y }),
      end
    );
    const pt = mathUtil.twoOrderBezier2(0.5, start, pt2, end);

    const ctx = this.context;
    ctx.save();
    ctx.beginPath();
    ctx.arc(
      pt.x,
      pt.y,
      Style.ControlPoint.radius * coordinate.ratio,
      0,
      Math.PI * 2,
      true
    );
    ctx.stroke();
    ctx.fill();
    ctx.restore();

    ctx.save();
    ctx.beginPath();
    help.setVectorStyle(ctx, null, "RoadEdge");
    //曲线
    ctx.moveTo(start.x, start.y);
    ctx.quadraticCurveTo(pt.x, pt.y, end.x, end.y);
    ctx.stroke();
    ctx.restore();
  }

  drawCurveRoad(vector) {
    if (vector.display && vector.midDivide) {
      const covesArray = help.transformCoves([
        vector.midDivide.leftMidDivideCurves,
        vector.midDivide.rightMidDivideCurves,
      ]);
      const ctx = this.context;
      ctx.save();
      help.setVectorStyle(ctx, vector);
      for (let coves of covesArray) {
        help.drawCoves(ctx, coves);
      }
      ctx.restore();
    }

    this.drawCurveRoadEdge(dataService.getCurveRoadEdge(vector.rightEdgeId));
    this.drawCurveRoadEdge(dataService.getCurveRoadEdge(vector.leftEdgeId));
    vector.leftLanesCurves &&
      vector.leftLanesCurves.forEach(this.drawCurveLan.bind(this));
    vector.rightLanesCurves &&
      vector.rightLanesCurves.forEach(this.drawCurveLan.bind(this));

    if (import.meta.env.DEV) {
      vector.points.forEach(this.drawPoint.bind(this));
    }
  }

  drawCurveRoadEdge(vector, isTemp) {
    const [coves] = help.transformCoves([vector.curves]);
    const ctx = this.context;
    ctx.save();
    help.setVectorStyle(ctx, vector);
    help.drawCoves(ctx, coves);
    ctx.restore();

    if (import.meta.env.DEV) {
      vector.points.forEach(this.drawPoint.bind(this));
    }
  }

  drawCurveLan(lines) {
    const [coves] = help.transformCoves([lines]);
    const ctx = this.context;
    ctx.save();

    help.setVectorStyle(ctx, null, "CurveLan");
    ctx.setLineDash(Style.Lane.dash);
    help.drawCoves(ctx, coves);
    ctx.restore();

    if (import.meta.env.DEV) {
      lines.map((line) => {
        this.drawPoint(line.start);
        this.drawPoint(line.end);
      });
    }
  }

  drawRoadPoint(vector) {
    this.drawPoint(vector);
  }

  drawCircle(element) {
    this.drawPoint({
      ...element.center,
      radius: element.radius,
      geoType: element.geoType,
    });
  }

  drawPoint(vector) {
    const pt = coordinate.getScreenXY({ x: vector.x, y: vector.y });
    const ctx = this.context;
    const style = help.setVectorStyle(ctx, vector, vector.geoType || "Point");
    const radius = (vector.radius || style.radius) * coordinate.ratio;
    ctx.save();
    ctx.beginPath();
    ctx.arc(pt.x, pt.y, radius, 0, Math.PI * 2, true);
    ctx.stroke();
    ctx.fill();
    ctx.restore();

    if (import.meta.env.DEV) {
      if (vector.vectorId) {
        this.drawText(vector, vector.vectorId);
      }
    }
  }

  // 文字
  drawText(position, txt, angle) {
    const ctx = this.context;
    ctx.save();
    help.setVectorStyle(ctx, null, "Text");

    const pt = coordinate.getScreenXY(position);
    if (angle) {
      ctx.translate(pt.x, pt.y);
      ctx.rotate(angle);
      ctx.fillText(txt, 0, 0);
    } else {
      ctx.fillText(txt, pt.x, pt.y);
    }
    ctx.restore();
  }

  drawLine(vector) {
    let start = dataService.getPoint(vector.startId);
    start = coordinate.getScreenXY(start);
    let end = dataService.getPoint(vector.endId);
    end = coordinate.getScreenXY(end);

    this.context.save();
    const style = help.setVectorStyle(
      this.context,
      vector,
      vector.category || vector.geoType
    );

    if (style.dash) {
      this.context.setLineDash(style.dash);
    }
    this.context.beginPath();
    this.context.moveTo(start.x, start.y);
    this.context.lineTo(end.x, end.y);
    this.context.stroke();
    this.context.restore();
  }

  drawElementLine(element) {
    let start = elementService.getPoint(element.startId);
    start = coordinate.getScreenXY(start);
    let end = elementService.getPoint(element.endId);
    end = coordinate.getScreenXY(end);

    this.context.save();
    const style = help.setVectorStyle(
      this.context,
      element,
      element.category || element.geoType
    );

    if (style.dash) {
      this.context.setLineDash(style.dash);
    }
    this.context.beginPath();
    this.context.moveTo(start.x, start.y);
    this.context.lineTo(end.x, end.y);
    this.context.stroke();
    this.context.restore();
  }
}

const draw = new Draw();
export { draw };