import React, { Component } from "react";

import Edge from "./Edge";
import Node from "./Node";
import InfSelectionArea from "./InfSelectionArea";

import * as transform from "../utils/transform";
import * as canvasActions from "../types/canvasActions";

import "./Annotation.scss";
import * as modes from "../types/modes";
import * as mouse from "../utils/mouse";

class Polygon extends Component {
  /*************
   *  LIFECYCLE *
   **************/
  constructor(props) {
    super(props);
    this.state = {
      anno: undefined,
    };
  }

  componentDidMount() {
    if (this.props.anno.mode === modes.CREATE) {
      const data = this.props.anno.data[0];
      const newAnno = {
        ...this.props.anno,
        data: [
          { x: data.x, y: data.y },
          { x: data.x + 1, y: data.y },
        ],
        selectedNode: 1,
      };
      this.setState({
        anno: newAnno,
      });
    } else {
      this.setState({ anno: { ...this.props.anno } });
    }
  }

  componentDidUpdate(prevProps) {
    if (prevProps.anno !== this.props.anno) {
      this.setState({ anno: { ...this.props.anno } });
    }
  }

  /**************
   * ANNO EVENTS *
   ***************/
  onMouseMove(e) {
    switch (this.state.anno.mode) {
      case modes.MOVE:
        this.move(
          e.movementX / this.props.svg.scale,
          e.movementY / this.props.svg.scale,
        );
        break;
      default:
        break;
    }
  }

  onMouseUp(e) {
    switch (this.state.anno.mode) {
      case modes.MOVE:
        if (e.button === 0) {
          this.performedAction(this.state.anno, canvasActions.ANNO_MOVED);
          this.requestModeChange(this.state.anno, modes.VIEW);
        }
        break;
      default:
        break;
    }
  }

  onMouseDown(e) {
    switch (this.state.anno.mode) {
      case modes.VIEW:
        if (e.button === 0) {
          if (this.props.isSelected) {
            this.requestModeChange(this.state.anno, modes.MOVE);
          }
        }
        break;
      default:
        break;
    }
  }
  /**************
   * NODE EVENTS *
   ***************/

  onNodeMouseUp(e, idx) {
    switch (this.state.anno.mode) {
      case modes.EDIT:
        this.performedAction(this.state.anno, canvasActions.ANNO_EDITED);
        this.requestModeChange(this.state.anno, modes.VIEW);
        break;
      default:
        break;
    }
  }

  onNodeMouseDown(e, idx) {
    switch (this.state.anno.mode) {
      case modes.CREATE:
        if (e.button === 2) {
          let newAnnoData = [...this.state.anno.data];
          newAnnoData.push({
            x: newAnnoData[idx].x,
            y: newAnnoData[idx].y,
          });
          const newAnno = {
            ...this.state.anno,
            data: newAnnoData,
            selectedNode: this.state.anno.selectedNode + 1,
          };
          this.setState({
            anno: newAnno,
          });
          this.performedAction(newAnno, canvasActions.ANNO_CREATED_NODE);
        }
        break;
      case modes.VIEW:
        if (e.button === 0) {
          this.requestModeChange(
            {
              ...this.state.anno,
              selectedNode: idx,
            },
            modes.EDIT,
          );
        }
        break;
      default:
        break;
    }
  }

  onNodeMouseMove(e, idx) {
    switch (this.state.anno.mode) {
      case modes.CREATE:
        this.updateAnnoByMousePos(e, idx);
        break;
      case modes.EDIT:
        e.stopPropagation();
        this.updateAnnoByMousePos(e, idx);
        break;
      default:
        break;
    }
  }

  onNodeDoubleClick(e, idx) {
    switch (this.state.anno.mode) {
      case modes.CREATE:
        this.performedAction(
          this.state.anno,
          canvasActions.ANNO_CREATED_FINAL_NODE,
        );
        break;
      default:
        break;
    }
  }

  /**************
   * EDGE EVENTS *
   ***************/
  onEdgeMouseDown(e, idx) {
    switch (this.state.anno.mode) {
      case modes.ADD:
        this.addNode(e, idx);
        break;
      case modes.VIEW:
        if (e.button === 0) {
          this.requestModeChange(this.state.anno, modes.MOVE);
        }
        break;
      default:
        break;
    }
  }

  /*************
   *  LOGIC     *
   *************/
  performedAction(anno, pAction) {
    if (this.props.onAction) {
      this.props.onAction(anno, pAction);
    }
  }

  toPolygonStr(data) {
    return data
      .map((e) => {
        return `${e.x},${e.y}`;
      })
      .join(" ");
  }

  requestModeChange(anno, mode) {
    this.props.onModeChangeRequest(anno, mode);
  }

  move(movementX, movementY) {
    this.setState({
      anno: {
        ...this.state.anno,
        data: transform.move(this.state.anno.data, movementX, movementY),
      },
    });
  }

  addNode(e, idx) {
    const mPos = mouse.getMousePosition(e, this.props.svg);
    let newAnnoData = this.state.anno.data.slice(0, idx);
    newAnnoData.push(mPos);
    const oldRest = this.state.anno.data.slice(idx);
    const newAnno = {
      ...this.state.anno,
      data: newAnnoData.concat(oldRest),
    };
    this.setState({ anno: newAnno });
    this.performedAction(newAnno, canvasActions.ANNO_ADDED_NODE);
  }

  removeLastNode() {
    const newAnno = {
      ...this.state.anno,
      data: [...this.state.anno.data.slice(0, this.state.anno.data.length - 1)],
      selectedNode: this.state.anno.selectedNode - 1,
    };
    this.setState({ anno: newAnno });
    this.performedAction(newAnno, canvasActions.ANNO_REMOVED_NODE);
  }

  updateAnnoByMousePos(e, idx) {
    const mousePos = mouse.getMousePosition(e, this.props.svg);
    let newAnnoData = [...this.state.anno.data];
    newAnnoData[idx].x = mousePos.x;
    newAnnoData[idx].y = mousePos.y;
    this.setState({
      anno: {
        ...this.state.anno,
        data: newAnnoData,
      },
    });
  }

  getResult() {
    return this.state.anno;
  }

  /*************
   *  RENDERING *
   **************/

  renderNodes() {
    if (!this.props.isSelected) return null;
    switch (this.state.anno.mode) {
      case modes.MOVE:
        return null;
      case modes.EDIT:
      case modes.CREATE:
        return (
          <Node
            anno={this.state.anno.data}
            idx={this.state.anno.selectedNode}
            key={this.state.anno.selectedNode}
            style={this.props.style}
            className={this.props.className}
            isSelected={this.props.isSelected}
            mode={this.state.anno.mode}
            svg={this.props.svg}
            onMouseDown={(e, idx) => this.onNodeMouseDown(e, idx)}
            onMouseUp={(e, idx) => this.onNodeMouseUp(e, idx)}
            onDoubleClick={(e, idx) => this.onNodeDoubleClick(e, idx)}
            onMouseMove={(e, idx) => this.onNodeMouseMove(e, idx)}
          />
        );
      default:
        return this.state.anno.data.map((e, idx) => {
          return (
            <Node
              anno={this.state.anno.data}
              idx={idx}
              key={idx}
              style={this.props.style}
              className={this.props.className}
              isSelected={this.props.isSelected}
              mode={this.state.anno.mode}
              svg={this.props.svg}
              onMouseDown={(e, idx) => this.onNodeMouseDown(e, idx)}
              onMouseUp={(e, idx) => this.onNodeMouseUp(e, idx)}
              onDoubleClick={(e, idx) => this.onNodeDoubleClick(e, idx)}
              onMouseMove={(e, idx) => this.onNodeMouseMove(e, idx)}
            />
          );
        });
    }
  }

  renderEdges() {
    if (!this.props.isSelected) return null;
    switch (this.state.anno.mode) {
      case modes.VIEW:
      case modes.ADD:
        let edges = this.state.anno.data.map((e, idx) => {
          return (
            <Edge
              anno={this.state.anno.data}
              idx={idx}
              key={idx}
              style={this.props.style}
              className={this.props.className}
              isSelected={this.props.isSelected}
              onMouseDown={(e, idx) => {
                this.onEdgeMouseDown(e, idx);
              }}
            />
          );
        });
        edges.push(
          <Edge
            anno={this.state.anno.data}
            closingEdge={true}
            key={edges.length}
            idx={0}
            style={this.props.style}
            className={this.props.className}
            isSelected={this.props.isSelected}
            onMouseDown={(e, idx) => {
              this.onEdgeMouseDown(e, idx);
            }}
          />,
        );
        return edges;
      default:
        return null;
    }
  }

  renderPolygon() {
    return (
      <polygon
        points={this.toPolygonStr(this.state.anno.data)}
        fill="none"
        stroke="purple"
        style={this.props.style}
        className={this.props.className}
      />
    );
  }

  renderInfSelectionArea() {
    switch (this.state.anno.mode) {
      case modes.MOVE:
        return <InfSelectionArea enable={true} svg={this.props.svg} />;
      default:
        return null;
    }
  }

  render() {
    if (this.state.anno) {
      return (
        <g
          onMouseMove={(e) => this.onMouseMove(e)}
          onMouseUp={(e) => this.onMouseUp(e)}
          onMouseDown={(e) => this.onMouseDown(e)}
        >
          {this.renderPolygon()}
          {this.renderEdges()}
          {this.renderNodes()}
          {this.renderInfSelectionArea()}
        </g>
      );
    } else {
      return <g></g>;
    }
  }
}

export default Polygon;