let haStateURL = "http://beacon:1880/ha_state"

let metrics = {
    roomDefaultOpacity : 0.15,
    roomHighlightOpacity : 0.6,
    roomHighlightDuration : 0.3,
    roomUnhighlightDuration: 0.3
}

const scene = new THREE.Scene()
const camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 )
let homeContainer = new THREE.Group()
scene.add(homeContainer)
let home = new THREE.Group()
homeContainer.add(home)

var areaNames = [ ]

var areasWithEntitiesToUpdate = { }

const renderer = new THREE.WebGLRenderer()
renderer.setSize( window.innerWidth, window.innerHeight )
document.body.appendChild( renderer.domElement )

const light = new THREE.AmbientLight(0xFFAAAA, 1)
light.position.z = 100
scene.add(light)
scene.background = new THREE.Color("white")

// back the camera up
camera.position.z = 25

// flip home on x axis
home.rotation.x = Math.PI

// Rotate container a bit for comfort
homeContainer.rotation.x = 0.6 * (-Math.PI / 2)

// Returns the first child (or container) whose name matches
function childWithName(container, name) {
    if (container.userData.name == name) {
        return container;
    }
    for (var child of container.children) {
        let childMatches = childWithName(child, name)
        if (childMatches != null) {
            return childMatches
        }
    }
    return null
}

function animate() {
    requestAnimationFrame( animate )
    TWEEN.update()

    var areasToUpdate = new Set()
    for (var area of Object.keys(areasWithEntitiesToUpdate)) {
        let updatedEntities = areasWithEntitiesToUpdate[area]
        if (updatedEntities.length > 0) {
            areasToUpdate.add(area)
        }
    }
    for (var area of areasToUpdate) {
        let areaContainer = childWithName(scene, area)
        let box = childWithName(areaContainer, "box")

        let fadeIn = new TWEEN.Tween(box.material)
        .to( { opacity: metrics.roomHighlightOpacity }, metrics.roomHighlightDuration * 1000)

        let fadeOut = new TWEEN.Tween(box.material)
        .to( { opacity: metrics.roomDefaultOpacity }, metrics.roomUnhighlightDuration * 1000)

        fadeIn.chain(fadeOut)
        fadeIn.start()
    }

    homeContainer.rotation.z += 0.005

    renderer.render( scene, camera )
}

animate()

function createTextMesh(text, colorName) {
    let canvas = document.createElement('canvas')
    let context = canvas.getContext('2d')
    let size = context.measureText(text)
    canvas.width = 100
    canvas.height = 100
    context.textAlign = "center"
    context.textBaseline = "middle"
    context.fillStyle = colorName
    context.font = '24pt sans-serif'
    context.fillText(text, 50, 50)

    let texture = new THREE.CanvasTexture(canvas)
    texture.needsUpdate = true
    let material = new THREE.MeshBasicMaterial({
        map: texture
    })
    material.transparent = true

    let plane = new THREE.PlaneGeometry(3, 3)
    let mesh = new THREE.Mesh(plane, material)

    return mesh
}

var lastUpdateTime = new Date()
function updateWithHAData(data) {
    // `data` is an array of entities. loop through and group by area
    var areasToEntities = { }
    var areasToUpdatedEntities = { }
    for (var area of areaNames) {
        areasToEntities[area] = new Array()
        areasToUpdatedEntities[area] = new Array()
    }

    let sortedAreaNames = areaNames
    sortedAreaNames.sort(function(a, b) {
        return b.length - a.length;
    })

    for (var entity of data) {
        let id = entity.entity_id
        let friendlyName = entity.attributes.friendly_name || entity.entity_id
        for (var area of sortedAreaNames) {
            let matchesUnderscored = id.includes(area.toLowerCase().replace(' ','_'))
            let matchesNoSpaces = id.includes(area.toLowerCase().replace(' ',''))
            let matchesFriendlyName = friendlyName.includes(area)

            let matches = matchesUnderscored || matchesNoSpaces || matchesFriendlyName

            if (matches) {
                let areaEntities = areasToEntities[area]
                areaEntities.push(entity)
                areasToEntities[area] = areaEntities

                let lastUpdate = new Date(entity.last_changed)
                if (lastUpdate > lastUpdateTime) {
                    let areaUpdatedEntities = areasToUpdatedEntities[area]
                    areaUpdatedEntities.push(entity)
                    areasToUpdatedEntities[area] = areaUpdatedEntities
                }
            }
        }
    }

    lastUpdateTime = new Date()
    areasWithEntitiesToUpdate = areasToUpdatedEntities
}

async function loadHAData() {
    let request = new Request(haStateURL)
    fetch(request)
    .then(response => {
        return response.json()
    })
    .then(json => {
        updateWithHAData(json)
        new Promise(resolve => setTimeout(resolve, 250))
        .then(_ => {
            loadHAData()
        })
    })
}

function setPosition(mesh, x, y, z, w, h, d) {
    // position sets the *center* position
    // our coordinates are top/left/bottom

    let meshX = x + w/2
    let meshY = y + h/2
    let meshZ = -z - d/2
    mesh.position.x = meshX
    mesh.position.y = meshY
    mesh.position.z = meshZ
}

function configureScene(data) {
    var minX = 1000
    var maxX = -1000
    var minY = minX
    var maxY = maxX

    // Add geometry for the rooms
    for (var room of data.rooms) {
        areaNames.push(room.name)
        let roomContainer = new THREE.Group()
        roomContainer.userData.name = room.name

        let roomGeo = new THREE.BoxGeometry(room.w, room.h, room.d)
        let roomColor = new THREE.Color(room.color)
        let roomBoxMaterial = new THREE.MeshPhysicalMaterial({ color: roomColor })
        roomBoxMaterial.transparent = true
        roomBoxMaterial.opacity = metrics.roomDefaultOpacity
        let roomMesh = new THREE.Mesh(roomGeo, roomBoxMaterial)
        roomMesh.userData.name = "box"
        roomContainer.add(roomMesh)

        let roomEdgesGeo = new THREE.EdgesGeometry(roomGeo)
        let roomLinesMaterial = new THREE.LineBasicMaterial({ color: roomColor })
        roomLinesMaterial.linewidth = 3
        let roomLines = new THREE.LineSegments(roomEdgesGeo, roomLinesMaterial)
        roomLines.userData.name = "lines"
        roomContainer.add(roomLines)

        let roomLabel = createTextMesh("A test or something", "red")
        roomLabel.userData.name = "label"
        roomContainer.add(roomLabel)

        setPosition(roomContainer, room.x, room.y, room.z || 0, room.w, room.h, room.d)
        home.add(roomContainer)

        minX = Math.min(minX, room.x)
        minY = Math.min(minY, room.y)

        maxX = Math.max(maxX, room.x + room.w)
        maxY = Math.max(maxY, room.y + room.h)
    }
    let xExtent = maxX - minX
    let yExtent = maxY - minY
    home.position.x = -1 * (xExtent / 2)
    home.position.y = +1 * (yExtent / 2)
}

async function loadHomeData() {
    let request = new Request('data.json')
    fetch(request)
    .then(response => {
        return response.json()
    })
    .then(json => {
        configureScene(json)
        // Kick off first HA load
        loadHAData()
    })
}

loadHomeData()