SENG440/api/v1/areaFunctions.js

let db = require("../config/db.js");
let util = require("util");
let turf = require("turf");
let mathFunc = require("./mathFunc.js");

module.exports = {
    organisePolygonPoints(polygonPoints) {
        console.log(polygonPoints);
        let polygons = []
        let polygonDict = {};
        polygonPoints.map((point) => {
            if (!(point.polygonID in polygonDict)) {
                polygonDict[point.polygonID] = {};
                polygonDict[point.polygonID].coords = [];
                polygonDict[point.polygonID].gameID = point.gameID;
                polygonDict[point.polygonID].userID = point.userID;
                polygonDict[point.polygonID].colour = point.colour;
                polygonDict[point.polygonID].polygonID = point.polygonID;
            }
            polygonDict[point.polygonID].coords.push({lat: point.lat, lng: point.lng});
        });
        for (let [polygon, polygonData] of Object.entries(polygonDict)){
            polygons.push(polygonDict[polygon]);
        }
        return polygons
    },
    submitFinalCollation(res, gameID, userID, points, area, mergedPolygonIDs) {
        query = util.format("CALL insertPolygon(\"%s\", \"%s\", %d)", gameID, userID, area);
        db.get().query(query, function(err, rows) {
            if (err) {
                console.log(err);
                return res.send(400);
            }

            let polygonID = rows[0][0].polygonID;
            query = "INSERT INTO polygonPoints (polygonID, lat, lng) VALUES ";
            let delimiterNecessary = false;

            points.map((point) => {
                if (delimiterNecessary) {
                    query += ",";
                }
                query += util.format("(\"%s\",%s,%s)", polygonID, point.lat, point.lng);
                delimiterNecessary = true;
            });
            query += ";";

            db.get().query(query, function(err, pointRows) {
                if (err) {
                    console.log(err);
                    return res.send(400);
                }
                module.exports.deleteMergedPolygons(mergedPolygonIDs, () => res.send(rows[0][0]));
                // res.send(rows[0][0]);
                return;
            });
        });
    },
    deleteMergedPolygons(mergedPolygonIDs, next) {
        if (mergedPolygonIDs.length > 0) {
            let id = mergedPolygonIDs.pop();
            console.log(id);
            let deleteQuery = util.format("CALL deletePolygon(\"%s\");", id);
            db.get().query(deleteQuery, function(err, pointRows) {
                if (err) {
                    console.log(err);
                    return res.send(400);
                }
                module.exports.deleteMergedPolygons(mergedPolygonIDs, next);
                return;
            });
        } else {
            next();
        }
    },
    collatePolygons(res, gameID, userID, points) {
        let query = util.format("CALL selectUserPolygon(\"%s\", \"%s\");", gameID, userID);
        db.get().query(query, function (err, rows) {
            if (err) {
                console.log(err);
                res.send(500);
            }
            let polygonPoints = points;
            let polygons = module.exports.organisePolygonPoints(rows[0]);
            let polygonResult = [];
            let polygonsMerged = [];
            polygons.map((polygon) => {
                if (polygon[0].lat != polygon[polygon.length - 1].lat &&
                    polygon[0].lng != polygon[polygon.length - 1].lng) {
                        polygon.push({lat: polygon[0].lat, lng: polygon[0].lng})
                }
                let intersect = module.exports.checkIntersects(polygonPoints, polygon.coords);
                if (intersect != null) {
                    polygonPoints = module.exports.unionPolygon(polygonPoints, polygon.coords);
                    polygonsMerged.push(polygon.polygonID);
                } else {
                    polygonResult.push(polygon);
                }
            });

            let area = mathFunc.calculateArea(points);
            // module.exports.polygonDestruction(res, gameID, userID, polygonPoints, area, polygonsMerged);
            module.exports.submitFinalCollation(res, gameID, userID, polygonPoints, area, polygonsMerged);
        });
    },
    unionPolygon(points1, points2){
        let arrayPoints1 = [module.exports.convertPointsObjToArray(points1)];
        let arrayPoints2 = [module.exports.convertPointsObjToArray(points2)];
        let poly1 = turf.polygon(arrayPoints1);
        let poly2 = turf.polygon(arrayPoints2);
        let unionPoly = turf.union(poly1, poly2);
        return module.exports.convertPointsArrayToObj(unionPoly.geometry.coordinates[0]);
    },
    checkIntersects(points1, points2) {
        let arrayPoints1 = [module.exports.convertPointsObjToArray(points1)];
        let arrayPoints2 = [module.exports.convertPointsObjToArray(points2)];
        let poly1 = turf.polygon(arrayPoints1);
        let poly2 = turf.polygon(arrayPoints2);
        return turf.intersect(poly1, poly2);
    },
    convertPointsObjToArray(points){
        let array = points.map((point) => {
            return [point.lng, point.lat];
        });
        return array;
    },
    convertPointsArrayToObj(points){
        let array = points.map((point) => {
            return {lat: point[1], lng: point[0]};
        });
        return array;
    }
}