import { boundingExtent } from "ol/extent";
import { addCoordinateTransforms, Projection, transform } from "ol/proj";
import TileGrid from "ol/tilegrid/TileGrid";
import { Tile } from "ol/layer";
import XYZ from "ol/source/XYZ";
import MousePosition from "ol/control/MousePosition";
import { createStringXY } from "ol/coordinate";
import OlMap from "ol/Map";
import { defaults as controlDefaults } from "ol/control/defaults";
import { Feature, View } from "ol";
import { Point } from "ol/geom";
import Style from "ol/style/Style";
import Icon from "ol/style/Icon";
import Text from "ol/style/Text";
import Fill from "ol/style/Fill";
import SourceVector from "ol/source/Vector";
import LayerVector from "ol/layer/Vector";

export type UnminedOptions = {
    minZoom: number;
    maxZoom: number;
    defaultZoom: number;
    imageFormat: string;
    minRegionX: number;
    minRegionZ: number;
    maxRegionX: number;
    maxRegionZ: number;
    worldName: string;
    background: string;
    markers: Array<any>;
}

export type UnminedRegions = {}[];

export class Unmined {
    
    openlayersMap: OlMap;

    map(mapId: string, options: UnminedOptions, regions: any[]) {
        const dpiScale = window.devicePixelRatio ?? 1.0;

        const worldMinX = options.minRegionX * 512;
        const worldMinY = options.minRegionZ * 512;
        const worldWidth = (options.maxRegionX + 1 - options.minRegionX) * 512;
        const worldHeight = (options.maxRegionZ + 1 - options.minRegionZ) * 512;

        const worldTileSize = 256;

        const worldMaxZoomFactor = Math.pow(2, options.maxZoom);

        // left, bottom, right, top, Y is negated
        var mapExtent = boundingExtent([
            [worldMinX * worldMaxZoomFactor, -(worldMinY + worldHeight) * worldMaxZoomFactor],
            [(worldMinX + worldWidth) * worldMaxZoomFactor, -worldMinY * worldMaxZoomFactor]]);

        var viewProjection = new Projection({
            code: 'VIEW',
            units: 'pixels',
        });

        var dataProjection = new Projection({
            code: 'DATA',
            units: 'pixels',
        });

        // Coordinate transformation between view and data
        // OpenLayers Y is positive up, world Y is positive down
        addCoordinateTransforms(viewProjection, dataProjection,
            function (coordinate) {
                return [coordinate[0], -coordinate[1]];
            },
            function (coordinate) {
                return [coordinate[0], -coordinate[1]];
            });

        const mapZoomLevels = options.maxZoom - options.minZoom;
        // Resolution for each OpenLayers zoom level        
        var resolutions = new Array(mapZoomLevels + 1);
        for (let z = 0; z < mapZoomLevels + 1; ++z) {
            resolutions[mapZoomLevels - z] = Math.pow(2, z) * dpiScale / worldMaxZoomFactor;
        }

        var tileGrid = new TileGrid({
            extent: mapExtent,
            origin: [0, 0],
            resolutions: resolutions,
            tileSize: worldTileSize / dpiScale
        });

        var unminedLayer =
            new Tile({
                source: new XYZ({
                    projection: viewProjection,
                    tileGrid: tileGrid,
                    tilePixelRatio: dpiScale,
                    tileSize: worldTileSize / dpiScale,

                    tileUrlFunction: function (coordinate) {
                        const worldZoom = -(mapZoomLevels - coordinate[0]) + options.maxZoom;
                        const worldZoomFactor = Math.pow(2, worldZoom);

                        const minTileX = Math.floor(worldMinX * worldZoomFactor / worldTileSize);
                        const minTileY = Math.floor(worldMinY * worldZoomFactor / worldTileSize);
                        const maxTileX = Math.ceil((worldMinX + worldWidth) * worldZoomFactor / worldTileSize) - 1;
                        const maxTileY = Math.ceil((worldMinY + worldHeight) * worldZoomFactor / worldTileSize) - 1;

                        const tileX = coordinate[1];
                        const tileY = coordinate[2];

                        const tileBlockSize = worldTileSize / worldZoomFactor;
                        const tileBlockPoint = {
                            x: tileX * tileBlockSize,
                            z: tileY * tileBlockSize
                        };

                        const hasTile = function () {
                            const tileRegionPoint = {
                                x: Math.floor(tileBlockPoint.x / 512),
                                z: Math.floor(tileBlockPoint.z / 512)
                            };
                            const tileRegionSize = Math.ceil(tileBlockSize / 512);

                            for (let x = tileRegionPoint.x; x < tileRegionPoint.x + tileRegionSize; x++) {
                                for (let z = tileRegionPoint.z; z < tileRegionPoint.z + tileRegionSize; z++) {
                                    const group = {
                                        x: Math.floor(x / 32),
                                        z: Math.floor(z / 32)
                                    };
                                    const regionMap = regions.find(e => e.x == group.x && e.z == group.z);
                                    if (regionMap) {
                                        const relX = x - group.x * 32;
                                        const relZ = z - group.z * 32;
                                        const inx = relZ * 32 + relX;
                                        var b = regionMap.m[Math.floor(inx / 32)];
                                        var bit = inx % 32;
                                        var found = (b & (1 << bit)) != 0;
                                        if (found) return true;
                                    }
                                }
                            }
                            return false;
                        };

                        if (tileX >= minTileX
                            && tileY >= minTileY
                            && tileX <= maxTileX
                            && tileY <= maxTileY
                            && hasTile()) {
                            const z = worldZoom,
                                yd = Math.floor(tileY / 10),
                                xd = Math.floor(tileX / 10),
                                y = tileY,
                                x = tileX
                            const url = `map/tiles/zoom.${z}/${xd}/${yd}/tile.${x}.${y}.${options.imageFormat}`
                            return url;
                        }
                        else
                            return undefined;
                    }
                })
            });

        var mousePositionControl = new MousePosition({
            coordinateFormat: createStringXY(0),
            projection: dataProjection
        });

        var map = new OlMap({
            target: mapId,
            controls: controlDefaults().extend([
                mousePositionControl
            ]),
            layers: [
                unminedLayer,
                /*
                new ol.layer.Tile({
                    source: new ol.source.TileDebug({
                        tileGrid: unminedTileGrid,
                        projection: viewProjection
                    })
                })
                */

            ],
            view: new View({
                center: [0, 0],
                extent: mapExtent,
                projection: viewProjection,
                resolutions: tileGrid.getResolutions(),
                maxZoom: mapZoomLevels,
                zoom: mapZoomLevels - options.maxZoom,
                constrainResolution: true,
                showFullExtent: true,
                constrainOnlyCenter: true
            })
        });

        if (options.markers) {
            var markersLayer = this.createMarkersLayer(options.markers, dataProjection, viewProjection);
            map.addLayer(markersLayer);
        }

        if (options.background) {
            document.getElementById(mapId).style.backgroundColor = options.background;

        }

        this.openlayersMap = map;
    }

    createMarkersLayer(markers, dataProjection, viewProjection) {
        var features = [];

        for (var i = 0; i < markers.length; i++) {
            var item = markers[i];
            var longitude = item.x;
            var latitude = item.z;

            var feature = new Feature({
                geometry: new Point(transform([longitude, latitude], dataProjection, viewProjection))
            });

            var style = new Style();
            if (item.image)
                style.setImage(new Icon({
                    src: item.image,
                    anchor: item.imageAnchor,
                    scale: item.imageScale
                }));

            if (item.text)
                style.setText(new Text({
                    text: item.text,
                    font: item.font,
                    offsetX: item.offsetX,
                    offsetY: item.offsetY,
                    fill: new Fill({
                        color: item.textColor
                    })
                }));

            feature.setStyle(style);

            features.push(feature);
        }

        var vectorSource = new SourceVector({
            features: features
        });

        var vectorLayer = new LayerVector({
            source: vectorSource
        });
        return vectorLayer;
    }
}