import { Flywheel } from "./effects.js";
import { getPathShapeBetweenPoints } from "./svg.js";

export class Game {

    constructor(svgEl, crosshairXEl, crosshairYEl) {
        this.flywheel = new Flywheel();
        this.svgEl = svgEl;

        // canvas position relative to mouse/screen
        // TODO: update on resize:
        svgEl.setAttribute('viewBox', '0 0 ' + window.innerWidth + ' ' + window.innerHeight);
        this.rect = svgEl.getBoundingClientRect();

        // move crosshairs
        window.addEventListener('mousemove', function (mousemoveEv) {
            let x = mousemoveEv.clientX - this.rect.left;
            let y = mousemoveEv.clientY - this.rect.top;

            crosshairXEl.setAttribute('x1', x)
            crosshairXEl.setAttribute('x2', x)
            crosshairYEl.setAttribute('y1', y)
            crosshairYEl.setAttribute('y2', y)
        }.bind(this));
        this.loadAnnotation();
    }

    loadAnnotation() {
        let json_request = new Request('/annotation.json?min_area=500');

        fetch(json_request).then(function (response) {
            return response.json();
        }).then((annotation) => {
            let svg_request = new Request('/annotation.svg?id='+annotation.id);

            fetch(svg_request).then(function (response) {
                return response.text()
            }).then((text) => {
                this.addAnnotation(annotation, text);
            })
        }).catch((e) => console.error(e));
    }

    addAnnotation(annotation, svgText) {
        
        //determine position
        const maxX = this.rect.width - annotation.bbox[2];
        const maxY = this.rect.height - annotation.bbox[3];
        const posX = Math.random() * maxX;
        const posY = Math.random() * maxY;
        
        let imgEl = document.createElementNS('http://www.w3.org/2000/svg', 'g');
        imgEl.innerHTML = svgText;
        imgEl.classList.add('img');
        imgEl.setAttribute('transform', `translate(${posX} ${posY})`);
        this.svgEl.appendChild(imgEl);

        let startTrace = function (mousedownEv) {
            // create shape to draw
            let shapeEl = document.createElementNS('http://www.w3.org/2000/svg', 'path');
            shapeEl.classList.add('rect');
            let p1 = { 'x': mousedownEv.clientX - this.rect.left, 'y': mousedownEv.clientY - this.rect.top }
            let corners = this.flywheel.effects.shape.getAngles();
            let d = getPathShapeBetweenPoints(p1, p1, corners);
            this.svgEl.appendChild(shapeEl);
            shapeEl.setAttribute('d', d);

            let mouseMoveEv = function (mousemoveE) {
                let p2 = { 'x': mousemoveE.clientX - this.rect.left, 'y': mousemoveE.clientY - this.rect.top }
                let d = getPathShapeBetweenPoints(p1, p2, corners);
                shapeEl.setAttribute('d', d);
            }.bind(this);
            let mouseUpEv = function (mouseupE) {
                let p2 = { 'x': mouseupE.clientX - this.rect.left, 'y': mouseupE.clientY - this.rect.top }
                let d = getPathShapeBetweenPoints(p1, p2, corners);
                shapeEl.setAttribute('d', d);

                console.log('up');
                window.removeEventListener('mousemove', mouseMoveEv); // remove itself.
                window.removeEventListener('mouseup', mouseUpEv); // remove itself.
                this.svgEl.removeEventListener('mousedown', startTrace); // remove itself.
                shapeEl.classList.add('locked');
                //TODO: calculate points

                const points = getPathShapeBetweenPoints(p1, p2, corners, true);
                this.calculateOverlap(annotation, posX, posY, points);



                this.flywheel.add();
                this.loadAnnotation();

                // fade out box
                setTimeout(function () {
                    shapeEl.classList.add('hide');
                    // remove shape
                    setTimeout(function () {
                        shapeEl.parentNode.removeChild(shapeEl);
                    }, 1000);
                }, 1000);
                // fade out img
                setTimeout(function () {
                    imgEl.classList.add('hide');
                    // remove shape
                    setTimeout(function () {
                        imgEl.parentNode.removeChild(imgEl);
                    }, 500);
                }, 500);
            }.bind(this);
            window.addEventListener('mousemove', mouseMoveEv);
            window.addEventListener('mouseup', mouseUpEv);
        }.bind(this);

        this.svgEl.addEventListener('mousedown', startTrace)

    }

    calculateOverlap(annotation, annotationDx, annotationDy, points){
        const subj_paths = annotation.segments.map((seg) => {
            return seg.map((point) => {
                return {X: point[0] + annotationDx -  annotation.bbox[0], Y: point[1] + annotationDy  - annotation.bbox[1]}
            })
        });
        // apparently, we need a deep copy if we pass it to findDifferencePaths/Clipper 
        const subj_paths2 = JSON.parse(JSON.stringify(subj_paths));
        const subj_paths3 = JSON.parse(JSON.stringify(subj_paths));
        // const subj_paths4 = JSON.parse(JSON.stringify(subj_paths));
        
        const drawn_paths = [points.map((point) => {
            return {X: point[0], Y: point[1]}
        })];
        const drawn_paths2 = [points.map((point) => {
            return {X: point[0], Y: point[1]}
        })];
        // const drawn_paths3 = [points.map((point) => {
        //     return {X: point[0], Y: point[1]}
        // })];
        const optimal_bbox_paths = [[
            {X: annotationDx, Y: annotationDy},
            {X: annotationDx + annotation.bbox[2], Y: annotationDy},
            {X: annotationDx + annotation.bbox[2], Y: annotationDy + annotation.bbox[3]},
            {X: annotationDx, Y: annotationDy + annotation.bbox[3]},
        ]];

        // console.log(subj_paths, drawn_paths, optimal_bbox_paths);

        const scale = 100;
        let minimalErrorPaths = this.findDifferencePaths(subj_paths, optimal_bbox_paths, scale);
        let drawnErrorPaths = this.findDifferencePaths(drawn_paths, subj_paths2, scale, ClipperLib.ClipType.ctDifference); // only error outside of shape
        let drawnSuccessPaths = this.findDifferencePaths(subj_paths3, drawn_paths2, scale, ClipperLib.ClipType.ctIntersection);
        // let drawnMissPaths = this.findDifferencePaths(subj_paths4, drawn_paths3, scale, ClipperLib.ClipType.ctDifference);
        // let drawnSolutionPaths = this.findIntersectionPaths(subj_paths2, drawn_paths, scale);  

        // const drawnArea = ClipperLib.JS.AreaOfPolygons(clip_paths) / (100*100));
        const shapeArea = Math.abs(ClipperLib.JS.AreaOfPolygons(subj_paths) / (100*100));
        // const shapeArea = ClipperLib.JS.AreaOfPolygons(subj_paths) / (100*100));
        // const minimalErrorArea = ClipperLib.JS.AreaOfPolygons(minimalErrorPaths) / (100*100);
        const successArea = Math.abs(ClipperLib.JS.AreaOfPolygons(drawnSuccessPaths) / (100*100));
        // const missArea = Math.abs(ClipperLib.JS.AreaOfPolygons(drawnMissPaths) / (100*100));
        const minimalErrorArea = Math.abs(ClipperLib.JS.AreaOfPolygons(minimalErrorPaths) / (100*100));
        const drawnErrorArea = Math.abs(ClipperLib.JS.AreaOfPolygons(drawnErrorPaths) / (100*100));
        // const error = ((drawnErrorArea+1)/(minimalErrorArea+1));
        // TODO different? We expected 20% of selection to be error (use minimalErrorArea/drawnArea), it was  25% of error (drawnErrorArea/drawnArea)
        //  is dat drawnErrorArea/minimalErrorArea
        const simpleScore = (successArea / shapeArea);// TODO: Math.pow() for harder punishment of missed areas?
        const errorScore = (drawnErrorArea - minimalErrorArea) / shapeArea; // it can get negative, which is what we want for the odd shapes.
        const score = simpleScore - Math.min(1, errorScore) / 2; // cap error at 1, and make things easier for the player, so errors count less (/2)
        console.log(successArea, shapeArea, simpleScore, errorScore, score);


        // Scale down coordinates and draw ...

        if(window.location.search == "?debug") {
            let shapeEl2 = document.createElementNS('http://www.w3.org/2000/svg', 'path');
            shapeEl2.classList.add('test');
            this.svgEl.appendChild(shapeEl2);
            shapeEl2.setAttribute('d', paths2string(minimalErrorPaths, scale));
            shapeEl2.setAttribute('stroke', 'green');
            shapeEl2.setAttribute('stroke-width', '2');
            shapeEl2.setAttribute('fill', 'red');
            let shapeEl = document.createElementNS('http://www.w3.org/2000/svg', 'path');
            shapeEl.classList.add('test');
            this.svgEl.appendChild(shapeEl);
            shapeEl.setAttribute('d', paths2string(drawnErrorPaths, scale));
            shapeEl.setAttribute('stroke', 'yellow');
            shapeEl.setAttribute('stroke-width', '2');
            shapeEl.setAttribute('fill', 'orange');
            let shapeEl3 = document.createElementNS('http://www.w3.org/2000/svg', 'path');
            shapeEl3.classList.add('test');
            this.svgEl.appendChild(shapeEl3);
            shapeEl3.setAttribute('d', paths2string(drawnSuccessPaths, scale));
            shapeEl3.setAttribute('stroke-width', '2');
            shapeEl3.setAttribute('fill', 'green');
        }

        // Converts Paths to SVG path string
        // and scales down the coordinates
        function paths2string (paths, scale) {
          var svgpath = "", i, j;
          if (!scale) scale = 1;
          for(i = 0; i < paths.length; i++) {
            for(j = 0; j < paths[i].length; j++){
              if (!j) svgpath += "M";
              else svgpath += "L";
              svgpath += (paths[i][j].X / scale) + ", " + (paths[i][j].Y / scale);
            }
            svgpath += "Z";
          }
          if (svgpath=="") svgpath = "M0,0";
          return svgpath;
        }
        // var paths = [[{"X":10,"Y":10},{"X":110,"Y":10},{"X":110,"Y":110},{"X":10,"Y":110}]];
        // console.log(JSON.stringify(paths));
        // ClipperLib.Clipper.ReversePaths(paths);
        // console.log(JSON.stringify(paths));
    }

    findDifferencePaths(subj_paths, clip_paths, scale, overrideClipType) {
        let cpr = new ClipperLib.Clipper();

        ClipperLib.JS.ScaleUpPaths(subj_paths, scale);
        ClipperLib.JS.ScaleUpPaths(clip_paths, scale);

        cpr.AddPaths(subj_paths, ClipperLib.PolyType.ptSubject, true);  // true means closed path
        cpr.AddPaths(clip_paths, ClipperLib.PolyType.ptClip, true);

        let solution_paths = new ClipperLib.Paths();
        // const clipType = ClipperLib.ClipType.ctIntersection;
        // const clipType = ClipperLib.ClipType.ctDifference; // we like to know everything that is wrong.
        const clipType = overrideClipType ?? ClipperLib.ClipType.ctXor; // we like to know everything that is wrong.
        const subject_fillType = ClipperLib.PolyFillType.pftNonZero;
        const clip_fillType = ClipperLib.PolyFillType.pftNonZero;
        const succeeded = cpr.Execute(clipType, solution_paths, subject_fillType, clip_fillType);
        return solution_paths;
    }
}