import React from "react"
import { StyleSheet, View, TouchableHighlight, Image } from "react-native"
import {
  ViroARSceneNavigator,
  ViroARScene,
  ViroARPlane,
  ViroAmbientLight,
  ViroDirectionalLight,
  ViroMaterials,
  Viro3DObject,
  ViroSpotLight,
  ViroNode,
  ViroSurface,
} from "react-viro"
import autobind from "autobind-decorator"
import backImage from "./images/back.png"

const styles = {
  buttons: {
    height: 80,
    width: 80,
  },
}

const shapes = {
  hardhat: {
    shape: require("./models/hardhat_obj.obj"),
    materials: [require("./models/hardhat.mtl")],
  },
  question: {
    shape: require("./models/question_obj.obj"),
    materials: [require("./models/question.mtl")],
  },
  clipboard: {
    shape: require("./models/clipboard_obj.obj"),
    materials: [require("./models/clipboard.mtl")],
  },
}
const distance = (vectorA, vectorB) => {
  return Math.sqrt(
    (vectorB[0] - vectorA[0]) * (vectorB[0] - vectorA[0]) +
      (vectorB[1] - vectorA[1]) * (vectorB[1] - vectorA[1]) +
      (vectorB[2] - vectorA[2]) * (vectorB[2] - vectorA[2])
  )
}

class WorkItemSceneAR extends React.Component {
  constructor(props) {
    super(props)

    this.state = {
      position: [0, 0, 0],
      rotation: [0, 0, 0],
      scale: [0.15, 0.15, 0.15],
      shouldBillboard: true,
    }
  }

  @autobind
  handleLoadEnd() {
    this.arScene.getCameraOrientationAsync().then((orientation) => {
      return this.arScene
        .performARHitTestWithRay(orientation.forward)
        .then((results) => {
          // Default position is just 1.5 meters in front of the user.
          const forward = orientation.forward
          const defaultPosition = [
            forward[0] * 1.5,
            forward[1] * 1.5,
            forward[2] * 1.5,
          ]
          let hitResultPosition = null

          // Filter the hit test results based on the position.
          if (results.length > 0) {
            for (var i = 0; i < results.length; i++) {
              let result = results[i]

              if (result.type == "ExistingPlaneUsingExtent") {
                let distance = Math.sqrt(
                  (result.transform.position[0] - position[0]) *
                    (result.transform.position[0] - position[0]) +
                    (result.transform.position[1] - position[1]) *
                      (result.transform.position[1] - position[1]) +
                    (result.transform.position[2] - position[2]) *
                      (result.transform.position[2] - position[2])
                )
                if (distance > 0.2 && distance < 10) {
                  // If we found a plane greater than .2 and less than 10 meters away then choose it!
                  hitResultPosition = result.transform.position
                  break
                }
              } else if (result.type == "FeaturePoint" && !hitResultPosition) {
                // If we haven't found a plane and this feature point is within range,
                // then we'll use it as the initial display point
                let distance = this._distance(
                  position,
                  result.transform.position
                )

                if (distance > 0.2 && distance < 10) {
                  hitResultPosition = result.transform.position
                }
              }
            }
          }

          this.setState({
            position: hitResultPosition || defaultPosition,
          })

          setTimeout(() => {
            this.updateInitialRotation()
          }, 200)
        })
    })
  }

  @autobind
  updateInitialRotation() {
    this.arNode.getTransformAsync().then((retDict) => {
      let rotation = retDict.rotation
      let absX = Math.abs(rotation[0])
      let absZ = Math.abs(rotation[2])

      let yRotation = rotation[1]

      // If the X and Z aren't 0, then adjust the y rotation.
      if (absX > 1 && absZ > 1) {
        yRotation = 180 - yRotation
      }

      this.setState({
        rotation: [0, yRotation, 0],
        shouldBillboard: false,
      })
    })
  }

  @autobind
  handleClick(position, source) {
    // this.props.history.replace("/activity")
  }

  render() {
    const { position, scale, rotation, shouldBillboard } = this.state

    return (
      <ViroARScene ref={(ref) => (this.arScene = ref)}>
        <ViroAmbientLight color="#ffffff" intensity={200} />
        <ViroNode
          ref={(ref) => (this.arNode = ref)}
          transformBehaviors={shouldBillboard ? "billboardY" : []}
          position={position}
          scale={scale}
          rotation={rotation}>
          <ViroSpotLight
            innerAngle={5}
            outerAngle={20}
            direction={[0, -1, 0]}
            position={[0, 15, 0]}
            color="#ffffff"
            castsShadow={true}
            shadowNearZ={0.1}
            shadowFarZ={6}
            shadowOpacity={0.9}
          />
          <Viro3DObject
            position={[0, 0, -1]}
            source={shapes["hardhat"].shape}
            resources={shapes["hardhat"].materials}
            type="OBJ"
            onLoadEnd={this.handleLoadEnd}
            onClick={this.handleClick}
          />
          <ViroSurface
            rotation={[-90, 0, 0]}
            position={[0, -0.001, 0]}
            width={2.5}
            height={2.5}
            arShadowReceiver={true}
            ignoreEventHandling={true}
          />
        </ViroNode>
      </ViroARScene>
    )
  }
}

export class ARViewer extends React.Component {
  constructor(props) {
    super(props)
  }

  @autobind
  handleBackPress() {
    this.props.history.replace("/")
  }

  render() {
    return (
      <View style={{ width: "100%", height: "100%" }}>
        <ViroARSceneNavigator
          style={{ width: "100%", height: "100%" }}
          apiKey="06F37B6A-74DA-4A83-965A-7DE2209A5C46"
          initialScene={{ scene: WorkItemSceneAR }}
        />

        <View style={{ position: "absolute", left: 30, right: 0, top: 50 }}>
          <TouchableHighlight
            style={styles.buttons}
            onPress={this.handleBackPress}
            underlayColor={"#00000000"}>
            <Image source={backImage} />
          </TouchableHighlight>
        </View>
      </View>
    )
  }
}