import { dataService } from "../Service/DataService";
import { roadService } from "../Service/RoadService";
import { historyUtil } from "./HistoryUtil";
import HistoryEvents from "../enum/HistoryEvents";
import { coordinate } from "../Coordinate";

export default class Change {
  constructor() {
    this.lastData = {}; // 每次都是当前数据和lastData进行比较，一般在mouseDown的时候存储进来
    this.currentData = {}; // 当前的变化
  }

  // 保存当前记录
  saveCurrentInfo() {
    // this.lastData.roadPoints = JSON.parse(
    //   JSON.stringify(dataService.getRoadPoints())
    // );
    //this.lastData.roads = JSON.parse(JSON.stringify(dataService.getRoads()));
    this.lastData.lines = JSON.parse(JSON.stringify(dataService.getLines()));
    this.lastData.texts = JSON.parse(JSON.stringify(dataService.getTexts()));
    this.lastData.points = JSON.parse(JSON.stringify(dataService.getPoints()));
  }

  operate() {
    //
    this.currentData = {};

    this.comparePoints();
    this.compareRoads();
    this.compareTexts();

    if (
      this.currentData.points.length == 0 &&
      this.currentData.roads.length == 0 &&
      this.currentData.texts.length == 0
    ) {
      this.saveCurrentInfo();
      return false;
    }
    this.lastData = {};
    // 这里不能取this.records.length-1，因为可能撤销后操作，这时候应该是覆盖，而不是往后面添加
    return true;
  }

  comparePoints() {
    const points = dataService.getRoadPoints();
    this.currentData.points = [];

    for (const key in points) {
      const point = points[key];
      // 不存在意味着增加
      if (!this.lastData.points[key]) {
        const item = {
          handle: HistoryEvents.AddPoint,
          point: historyUtil.getDataForPoint(point),
        };
        this.currentData.points.push(item);
      } else {
        const lastPoint = this.lastData.points[key];
        if (
          point.x == lastPoint.x &&
          point.y == lastPoint.y &&
          JSON.stringify(point.parent) == JSON.stringify(lastPoint.parent)
        ) {
          delete this.lastData.points[key];
          continue;
        } else {
          const item = {
            handle: HistoryEvents.ModifyPoint,
            prePoint: historyUtil.getDataForPoint(lastPoint),
            curPoint: historyUtil.getDataForPoint(point),
          };
          this.currentData.points.push(item);
        }
      }
      delete this.lastData.points[key];
    }

    for (const key in this.lastData.points) {
      const item = {
        handle: HistoryEvents.DeletePoint,
        point: historyUtil.getDataForPoint(this.lastData.points[key]),
      };
      this.currentData.points.push(item);
    }
  }

  compareRoads() {
    this.currentData.roads = [];
    const roads = dataService.getRoads();
    for (const key in roads) {
      const road = roads[key];
      const lastRoad = this.lastData.roads[key];

      // 不存在意味着增加
      if (!lastRoad) {
        const item = {
          handle: HistoryEvents.AddRoad,
          road: historyUtil.getDataForRoad(road),
        };
        this.currentData.roads.push(item);
      } else {
        if (!historyUtil.isDifferentForRoads(road, lastRoad)) {
          delete this.lastData.roads[key];
          continue;
        } else {
          const item = {
            handle: HistoryEvents.ModifyRoad,
            preRoad: historyUtil.getDataForRoad(lastRoad),
            curRoad: historyUtil.getDataForRoad(road),
          };
          this.currentData.roads.push(item);
        }
      }
      delete this.lastData.roads[key];
    }

    for (const key in this.lastData.roads) {
      const item = {
        handle: HistoryEvents.DeleteRoad,
        road: historyUtil.getDataForRoad(this.lastData.roads[key]),
      };
      this.currentData.roads.push(item);
    }
  }

  compareTexts() {
    this.currentData.texts = [];
    const texts = dataService.getTexts();

    for (const key in texts) {
      const text = texts[key];
      const lastText = this.lastData.texts[key];

      // 不存在意味着增加
      if (!lastText) {
        const item = {
          handle: HistoryEvents.AddText,
          text: historyUtil.getDataForText(text),
        };
        this.currentData.texts.push(item);
      } else {
        if (!historyUtil.isDifferentForTexts(text, lastText)) {
          delete this.lastData.texts[key];
          continue;
        } else {
          const item = {
            handle: HistoryEvents.ModifyText,
            preText: historyUtil.getDataForText(lastText),
            curText: historyUtil.getDataForText(text),
          };
          this.currentData.texts.push(item);
        }
      }
      delete this.lastData.texts[key];
    }

    for (const key in this.lastData.texts) {
      const item = {
        handle: HistoryEvents.DeleteText,
        text: historyUtil.getDataForText(this.lastData.texts[key]),
      };
      this.currentData.texts.push(item);
    }
  }
}

const change = new Change();
export { change };