import React, { Component } from "react";
import "./Annotation.scss";
import * as modes from "../types/modes";
import * as transform from "../utils/transform";
import * as canvasActions from "../types/canvasActions";
import * as mouse from "../utils/mouse";
import InfSelectionArea from "./InfSelectionArea";
import Node from "./Node";

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

  componentDidMount(prevProps) {
    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 },
          { x: data.x + 1, y: data.y + 1 },
          { x: data.x, y: data.y + 1 },
        ],
        selectedNode: 2,
      };
      this.setState({
        anno: newAnno,
      });
      // this.performedAction(newAnno, canvasActions.ANNO_START_CREATING)
    } else {
      this.setState({ anno: { ...this.props.anno } });
    }
  }

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

  /*************
   * EVENTS    *
   **************/
  onNodeMouseMove(e, idx) {
    switch (this.state.anno.mode) {
      case modes.CREATE:
      case modes.EDIT:
        const mousePos = mouse.getMousePosition(e, this.props.svg);
        const idxMinus = idx - 1 < 0 ? 3 : idx - 1;
        const idxPlus = idx + 1 > 3 ? 0 : idx + 1;
        let newAnnoData = [...this.state.anno.data];
        if (idx % 2 === 0) {
          newAnnoData[idxMinus].x = mousePos.x;
          newAnnoData[idx].x = mousePos.x;
          newAnnoData[idx].y = mousePos.y;
          newAnnoData[idxPlus].y = mousePos.y;
        } else {
          newAnnoData[idxMinus].y = mousePos.y;
          newAnnoData[idx].x = mousePos.x;
          newAnnoData[idx].y = mousePos.y;
          newAnnoData[idxPlus].x = mousePos.x;
        }
        this.setState({
          anno: {
            ...this.state.anno,
            data: newAnnoData,
          },
        });
        break;
      default:
        break;
    }
  }

  onNodeMouseDown(e, idx) {
    switch (this.state.anno.mode) {
      case modes.VIEW:
        if (e.button === 0) {
          this.requestModeChange(
            { ...this.state.anno, selectedNode: idx },
            modes.EDIT,
          );
        }
        break;
      default:
        break;
    }
  }

  onNodeMouseUp(e, idx) {
    switch (this.state.anno.mode) {
      case modes.EDIT:
        if (e.button === 0) {
          this.requestModeChange(this.state.anno, modes.VIEW);
          this.performedAction(this.state.anno, canvasActions.ANNO_EDITED);
        }
        break;
      case modes.CREATE:
        if (e.button === 2) {
          this.requestModeChange(this.state.anno, modes.VIEW);
          this.performedAction(this.state.anno, canvasActions.ANNO_CREATED);
        }
        break;
      default:
        break;
    }
  }

  handleNodeMouseLeave(e, idx) {
    switch (this.state.anno.mode) {
      //if mouse left Canvas in create mode, transit to VIEW mode
      case modes.CREATE:
        this.requestModeChange(this.state.anno, modes.VIEW);
        this.performedAction(this.state.anno, canvasActions.ANNO_CREATED);
        break;
      default:
        break;
    }
  }

  /**************
   * 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.requestModeChange(this.state.anno, modes.VIEW);
          this.performedAction(this.state.anno, canvasActions.ANNO_MOVED);
        }
        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;
    }
  }
  /*************
   *  LOGIC     *
   **************/
  getResult() {
    return this.state.anno;
  }

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

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

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

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

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

  renderPolygon() {
    switch (this.state.anno.mode) {
      default:
        return (
          <polygon
            points={this.toPolygonStr(this.state.anno.data)}
            fill="none"
            stroke="purple"
            style={this.props.style}
            className={this.props.className}
            onMouseDown={(e) => this.onMouseDown(e)}
            onMouseUp={(e) => this.onMouseUp(e)}
          />
        );
    }
  }

  renderNodes() {
    if (!this.props.isSelected) return null;
    switch (this.state.anno.mode) {
      case modes.MOVE:
      case modes.EDIT_LABEL:
        return null;
      case modes.EDIT:
      case modes.CREATE:
        return (
          <Node
            anno={this.state.anno.data}
            key={this.state.anno.selectedNode}
            idx={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)}
            onMouseMove={(e, idx) => this.onNodeMouseMove(e, idx)}
            onMouseLeave={(e, idx) => this.handleNodeMouseLeave(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)}
              onMouseLeave={(e, idx) => this.handleNodeMouseLeave(e, idx)}
            />
          );
        });
    }
  }

  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.renderNodes()}
          {this.renderInfSelectionArea()}
        </g>
      );
    } else {
      return null;
    }
  }
}

export default BBox;