import { GeoLayer } from './geolayer.js'
import { GeoPoint, GeoMultiShape } from './geographics.js'
import GeoJson from './geojson.js'

import Popup from '../popup.js'

/**
 * The Overlay-Class shall provide and easy to use frameworkd
 * of marking points of interest on a map, using shapes, geometries,
 * items or text.
 *
 * It's highly configurable and adaptable to a variety of scenarios.
 *
 */

export default class Overlay {
    /**
     *Creates an instance of Overlay.
     * @param {*} [{
     *         name = "unnamed",        {string}
     *         connector = false,
     *         connectorType = "line",
     *         location = null,
     *         label = false,
     *         labelType = null,
     *         labelLocation = null,
     *         labelAlignment = "center",
     *         labelVerticalAlign = "underneath",
     *         labelTarget = null,
     *         shape = "geometry",      {string} - Defines the shape to be used: geometry, circle, rectangle
     *         geometry = null,
     *         geometryType = "point",
     *         geometryFallback = "circle",
     *         informationPopup = "infocard",
     *
     *     }={}]
     * @memberof Overlay
     */
    constructor(opts = {}) {
        let defaultTextStyle = new PIXI.TextStyle()

        Object.assign(
            this,
            {
                type: 'auto',
                name: 'unnamed',

                borderColor: 0x000000,
                borderThickness: 5,

                disabledAlpha: 1,
                disabledColor: 0xaa1111,
                disabledBorderColor: 0x000000,
                enabled: true,
                labelScale: 1,
                location: null,
                label: false,
                labelType: null,
                labelLocation: null,
                labelAlignment: 'center',
                labelVerticalAlign: 'underneath',
                labelSpacing: 10,
                labelTarget: null,
                geometry: null,
                information: '',
                informationPath: null,
                informationType: 'popup',
                icon: null,
                iconAlpha: 1,
                iconAnchor: { x: 0.5, y: 0.5 },
                iconColor: 0xffffff,
                iconScale: 1,
                iconOffset: { x: 0, y: 0 },
                items: [],
                color: 0xff00ff,
                fillAlpha: 1,
                size: 50,
                scale: 1,
                rescale: false,
                popoverOffset: { x: 0, y: 0 },
                zoomVisibility: { min: 0, max: Number.MAX_VALUE },

                /**
                 * The following Attributes are taken from the TextStyle class
                 * of PIXI. All can be overwritten in the overlay's JSON file.
                 */
                labelMultiLineAlign: defaultTextStyle.align,
                labelBreakWords: defaultTextStyle.breakWords,
                labelDropShadow: defaultTextStyle.dropShadow,
                labelDropShadowAlpha: defaultTextStyle.dropShadowAlpha,
                labelDropShadowAngle: defaultTextStyle.dropShadowAngle,
                labelDropShadowBlur: defaultTextStyle.dropShadowBlur,
                labelDropShadowColor: defaultTextStyle.dropShadowColor,
                labelDropShadowDistance: defaultTextStyle.dropShadowDistance,
                fontColor: 0x000000,
                fontFamily: defaultTextStyle.fontFamily,
                fontSize: defaultTextStyle.fontSize,
                fontStyle: defaultTextStyle.fontStyle,
                fontWeight: defaultTextStyle.fontWeight,
                labelStroke: defaultTextStyle.stroke,
                labelStrokeThickness: defaultTextStyle.strokeThickness,
                wordWrap: defaultTextStyle.wordWrap,
                wordWrapWidth: defaultTextStyle.wordWrapWidth,
                labelFill: defaultTextStyle.fill,
                labelFillGradientType: defaultTextStyle.fillGradientType,
                labelFillGradientStops: defaultTextStyle.fillGradientStops,
                fontVariant: defaultTextStyle.fontVariant,
                labelLeading: defaultTextStyle.leading,
                letterSpacing: defaultTextStyle.letterSpacing,
                labelLineHeight: defaultTextStyle.lineHeight,
                labelLineJoin: defaultTextStyle.lineJoin,
                labelMiterLimit: defaultTextStyle.miterLimit,
                labelPadding: defaultTextStyle.padding,
                labelTrim: defaultTextStyle.trim,
                textBaseline: defaultTextStyle.textBaseline,
                labelWhiteSpace: defaultTextStyle.whiteSpace
            },
            opts
        )
    }

    get textureParameters() {
        return ['icon']
    }

    setTexture(parameter, key, path) {
        let obj = (this[parameter] = {})
        obj._key = key
        obj._path = path
        obj._texture = null

        obj.initialize = function(texture) {
            if (!texture) console.error('Could not initialize texture. Invalid value provided: ', texture)
            this._texture = texture
        }.bind(obj)

        obj.__defineGetter__('texture', function() {
            if (!obj._texture) {
                console.error('Texture was not yet initialized! ', obj)
            } else {
                return obj._texture
            }
        })

        obj.__defineGetter__('key', () => {
            return obj._key
        })
        obj.__defineGetter__('path', () => {
            return obj._path
        })
    }

    apply(parameter, func, obj = null) {
        if (obj == null) return
        if (Array.isArray(obj)) {
            obj.forEach(child => {
                if (typeof child == 'object') this.apply(parameter, func, child)
            })
        } else {
            for (let [key, val] of Object.entries(obj)) {
                if (val == null) continue
                if (key == parameter) {
                    func.call(obj, val)
                }

                if (typeof val == 'object') {
                    this.apply(parameter, func, val)
                }
            }
        }
    }

    /**
     * Creates an overlay from the current Object.
     *
     * @param {settings} object - Object to configure the creation process.
     * @param {settings.excludeItems} function - You may provide a function, that excludes elements selectively. The function must return true for items to exclude them.
     * @param {settings.adjustItems} function - You may adjust the created PIXI items, using the adjustItems function.
     * @returns {GeoLayer} - Returns the created GeoLayer.
     * @memberof Overlay
     */
    create({
        excludeItems = item => {
            return false
        },
        informationCallback = null,
        adjustItems = null,
        cleanupItems = null
    } = {}) {
        const name = this.name[0].toUpperCase() + this.name.slice(1).toLowerCase() + ' Overlay'
        let geoLayer = new GeoLayer(new PIXI.Container(), { name })
        geoLayer.visibility = this.zoomVisibility

        if (this.rescale) geoLayer.rescale = this.rescale
        this.items.forEach(item => {
            if (!excludeItems(item)) {
                if (adjustItems) {
                    adjustItems(item)
                }

                item.overlay = this
                let graphics = this.createItem(item, informationCallback)
                geoLayer.addChild(graphics)
                if (cleanupItems) {
                    cleanupItems(item)
                }
            }
        })
        return geoLayer
    }
    getItemProperty(item, property) {
        let propertyValue = null
        const propertyExistsOnItem = item[property] !== undefined
        const propertyExistsOnOverlay = this[property] !== undefined

        if (propertyExistsOnItem) propertyValue = item[property]
        else if (propertyExistsOnOverlay) propertyValue = this[property]
        else {
            console.error(`Invalid property: ${property} on`, item)
        }

        propertyValue = this._resolveReference(item, propertyValue)

        return propertyValue
    }

    _isReference(property) {
        if (property && typeof property == 'object' && property.hasOwnProperty('@property')) return true
        else return false
    }

    _resolveReference(item, property) {
        if (this._isReference(property)) {
            let referencedProperty = property['@property']
            return this.getItemProperty(item, referencedProperty)
        } else {
            return property
        }
    }

    findAllTextures() {
        let textures = []

        this.textureParameters.forEach(parameter => {
            if (this.hasOwnProperty(parameter) && this[parameter] != null) {
                textures.push(this[parameter])
            }

            this.items.forEach(item => {
                if (item.hasOwnProperty(parameter) && item[parameter] != null) {
                    textures.push(item[parameter])
                }
            })
        })

        return textures
    }

    selectTextures(textures) {
        this.textureParameters.forEach(parameter => {
            if (this.hasOwnProperty(parameter) && this[parameter]) {
                let path = this[parameter]
                const texture = textures.get(path)
                if (!texture) console.error('Texture could not be selected: ', path)
                this[parameter] = {
                    texture,
                    path
                }
            }
            this.items.forEach((item, idx) => {
                if (this.items[idx].hasOwnProperty(parameter) && this.items[idx][parameter]) {
                    const path = this.items[idx][parameter]
                    const texture = textures.get(path)

                    this.items[idx][parameter] = {
                        path,
                        texture
                    }
                }
            })
        })
    }

    createItem(item, informationCallback = null) {
        let geographics

        /**
         * Use a factory to draw the items, if a type is specified.
         */
        if (this.type != 'auto') {
            let geographicsFactory = Overlay.requestFactory(this.type)
            if (!geographicsFactory)
                console.error(
                    'Invalid Overlay Mode: ' +
                        this.type +
                        '. Fallback to auto mode. Overlaymodes must be registeres beforehand. Valid modes are: ' +
                        Overlay.listFactories().join(',') +
                        '.'
                )
            else {
                let actualItem = Object.assign({}, this, item)
                geographics = geographicsFactory(actualItem)
            }
        }

        /**
         * Otherwise draw the default geographics.
         */
        if (!geographics) {
            if (item.geometry == null || item.geometry == undefined) {
                if (item.location) {
                    geographics = this._drawPoint(item, informationCallback)
                    const scale = this.getItemProperty(item, 'scale')
                    geographics.graphics.scale.set(scale, scale)
                } else console.warn("Item could not be drawn. Specify a 'location' or a 'geometry'.", item)
            } else {
                geographics = this._drawGeometry(item)
                this._drawRoutine(geographics, item, informationCallback)
            }

            this._drawLabel(item, geographics)
        }

        return geographics
    }

    _drawLabel(item, geographics) {
        let label = this.getItemProperty(item, 'label')
        if (label) {
            let textStyle = this._gatherFontStyle(item)
            let text = new PIXI.Text(label, textStyle)

            let labelScale = this.getItemProperty(item, 'labelScale')
            text.scale.set(labelScale, labelScale)

            let position = new PIXI.Point()

            let align = this.getItemProperty(item, 'labelAlignment')
            if (align == 'left');
            else if (align == 'center') position.set(text.position.x - text.width / 2, text.position.y)
            else if (align == 'right') position.set(text.position.x - text.width, text.position.y)
            else this._logPropertyNotImplemented('labelAlignment', align)

            let verticalAlign = this.getItemProperty(item, 'labelVerticalAlignment')
            if (verticalAlign == 'underneath') {
                let size = this.getItemProperty(item, 'size')
                let scale = this.getItemProperty(item, 'scale')

                let labelSpacing = this.getItemProperty(item, 'labelSpacing')

                position.y += size * scale + labelSpacing
            } else if (verticalAlign == 'above') {
                let size = this.getItemProperty(item, 'size')
                let scale = this.getItemProperty(item, 'scale')

                let labelSpacing = this.getItemProperty(item, 'labelSpacing')

                position.y -= size * scale + text.height + labelSpacing
            } else this._logPropertyNotImplemented('labelVerticalAlignment', verticalAlign)

            text.position.set(position.x, position.y)

            geographics.graphics.addChild(text)
        }
    }

    _gatherFontStyle(item) {
        return {
            align: this.getItemProperty(item, 'labelMultiLineAlign'),
            breakWords: this.getItemProperty(item, 'labelBreakWords'),
            dropShadow: this.getItemProperty(item, 'labelDropShadow'),
            dropShadowAlpha: this.getItemProperty(item, 'labelDropShadowAlpha'),
            dropShadowAngle: this.getItemProperty(item, 'labelDropShadowAngle'),
            dropShadowBlur: this.getItemProperty(item, 'labelDropShadowBlur'),
            dropShadowColor: this.getItemProperty(item, 'labelDropShadowColor'),
            dropShadowDistance: this.getItemProperty(item, 'labelDropShadowDistance'),
            fontFamily: this.getItemProperty(item, 'fontFamily'),
            fontSize: this.getItemProperty(item, 'fontSize'),
            fontStyle: this.getItemProperty(item, 'fontStyle'),
            fontWeight: this.getItemProperty(item, 'fontWeight'),
            stroke: this.getItemProperty(item, 'labelStroke'),
            strokeThickness: this.getItemProperty(item, 'labelStrokeThickness'),
            wordWrap: this.getItemProperty(item, 'wordWrap'),
            wordWrapWidth: this.getItemProperty(item, 'wordWrapWidth'),

            fill: this.getItemProperty(item, 'labelFill'),
            fillGradientType: this.getItemProperty(item, 'labelFillGradientType'),
            fillGradientStops: this.getItemProperty(item, 'labelFillGradientStops'),
            fontVariant: this.getItemProperty(item, 'fontVariant'),
            leading: this.getItemProperty(item, 'labelLeading'),
            letterSpacing: this.getItemProperty(item, 'letterSpacing'),
            lineHeight: this.getItemProperty(item, 'labelLineHeight'),
            lineJoin: this.getItemProperty(item, 'labelLineJoin'),
            miterLimit: this.getItemProperty(item, 'labelMiterLimit'),
            padding: this.getItemProperty(item, 'labelPadding'),
            trim: this.getItemProperty(item, 'labelTrim'),
            textBaseline: this.getItemProperty(item, 'textBaseline'),
            whiteSpace: this.getItemProperty(item, 'labelWhiteSpace')
        }
    }

    _drawGeometry(item) {
        let multiPolygonArray = []

        if (Array.isArray(item.geometry))
            item.geometry.forEach(geometry => {
                let polygon = this._drawPolygon(geometry)
                if (polygon != null && polygon != []) multiPolygonArray.push(polygon)
            })
        else {
            let polygon = this._drawPolygon(item.geometry)
            if (polygon != null && polygon != []) multiPolygonArray.push(polygon)
        }
        const overlay = this
        return new GeoMultiShape(multiPolygonArray, {
            onDraw: function() {
                overlay._fill.call(overlay, this, item)
            }
        })
    }

    _drawPolygon(geometry) {
        let polygon = []
        if (geometry.type == 'Polygon') {
            if (GeoJson.validateCoordinates(geometry.type, geometry.coordinates)) {
                polygon = GeoJson.convert(geometry.type, geometry.coordinates)
            } else console.error(`Could not validate coordinates for type '${geometry.type}'.`, geometry.coordinates)
        } else {
            console.warn(`Geometry of type ${geometry.type} is not implemented yet, hence it was ignored.`)
        }

        return polygon
    }

    _drawRoutine(geographics, item, informationCallback = null) {
        this._createIcon(geographics, item)

        const enabled = this.getItemProperty(item, 'enabled')
        if (enabled) this._createInformation(geographics, item, informationCallback)
    }

    _createIcon(geographics, item) {
        let icon = this.getItemProperty(item, 'icon')
        if (icon) {
            if (icon.texture) {
                let sprite = new PIXI.Sprite(icon.texture)

                const iconAnchor = this.getItemProperty(item, 'iconAnchor')
                sprite.anchor.set(iconAnchor.x, iconAnchor.y)

                const iconScale = this.getItemProperty(item, 'iconScale')
                if (iconScale) sprite.scale.set(iconScale, iconScale)

                const iconOffset = this.getItemProperty(item, 'iconOffset')
                if (iconOffset && iconOffset.x != null && iconOffset.y != null)
                    sprite.position.set(iconOffset.x, iconOffset.y)

                const iconColor = this.getItemProperty(item, 'iconColor')
                if (iconColor) sprite.tint = iconColor

                const iconAlpha = this.getItemProperty(item, 'iconAlpha')
                if (iconAlpha) sprite.alpha = iconAlpha

                geographics.graphics.addChild(sprite)
            }
        }
    }

    _createInformation(geographics, item, callback = null) {
        if (item.information) {
            /**
             * SO: The overlay class is quite convenient.
             * But managing the information creation solely inside this
             * class restricts us massively.
             *
             * Maybe a restructuring would be good, that we can handle
             * the creation of information with a callback and can adapt
             * to any occuring situation.
             *
             * e.g.
             *
             * overlay.informationHandler((geo, type, item)=>{
             *         switch(type){
             *              case "popup":
             *                              createPopup(item.information)
             *                              break;
             *
             *                  ....
             * }
             * })
             */

            geographics.graphics.interactive = true
            const informationType = this.getItemProperty(item, 'informationType')

            if (callback) callback.call(this, geographics, informationType, item)
            else {
                this.defaulInformationCallback(geographics, informationType, item)
            }
        }
    }

    defaulInformationCallback(geographics, informationType, item) {
        // Make the items interactive.
        geographics.graphics.interactive = true
        geographics.graphics.on('pointerdown', () => {
            if (!geographics.active) {
                geographics.active = true

                // Create and place the popup.
                let popup = new Popup({
                    header: item.name,
                    content: item.information,
                    maxWidth: 350
                })

                if (geographics.map) {
                    const scale = 1 / geographics.map.scatter.scale
                    popup.scale.set(scale, scale)
                }

                popup.position.set(
                    geographics.graphics.position.x - popup.width / 2,
                    geographics.graphics.position.y - popup.height - 20
                )

                geographics.graphics.parent.addChild(popup)

                // Remove the items after n milliseconds.
                const removeTime = 2000
                setTimeout(() => {
                    geographics.active = false
                    popup.parent.removeChild(popup)
                }, removeTime)
            }
        })
    }

    _fill(geographics, item) {
        const enabled = this.getItemProperty(item, 'enabled')
        const color = enabled ? this.getItemProperty(item, 'color') : this.getItemProperty(item, 'disabledColor')
        let alpha = enabled ? this.getItemProperty(item, 'fillAlpha') : this.getItemProperty(item, 'disabledAlpha')
        geographics.graphics.beginFill(color, alpha)
    }

    _drawPoint(item, informationCallback = null) {
        const overlay = this
        let geographic = new GeoPoint(item.location, {
            onDraw: function() {
                overlay._fill.call(overlay, this, item)
                const size = overlay.getItemProperty(item, 'size') ? overlay.getItemProperty(item, 'size') : 0
                this.graphics.drawCircle(0, 0, size)
                overlay._drawRoutine.call(overlay, this, item, informationCallback)
            }
        })
        return geographic
    }

    _logPropertyNotImplemented(property, value) {
        console.error(`Value '${value}' is not yet implemented in property '${property}'.`)
    }
}

Overlay.Modes = { auto: null }

Overlay.createFactory = function(name, geographicsFactory) {
    if (Overlay.Modes.hasOwnProperty(name))
        console.warn(`The mode ${name} was already implemented and was overwritten!`)
    Overlay.Modes[name] = geographicsFactory
}

Overlay.requestFactory = function(name) {
    return Overlay.Modes[name]
}

Overlay.listFactories = function() {
    let modes = []
    for (let key of Object.keys(Overlay.Modes)) {
        modes.push(key)
    }
    return modes
}