/** Copyright 2014-2017 Stewart Allen -- All Rights Reserved */

"use strict";

var gs_kiri_print = exports;

(function() {

    if (!self.kiri) self.kiri = {};

    var KIRI = self.kiri,
        DRIVERS = KIRI.driver,
        CAM = DRIVERS.CAM,
        FDM = DRIVERS.FDM,
        LASER = DRIVERS.LASER,
        BASE = self.base,
        UTIL = BASE.util,
        DBUG = BASE.debug,
        POLY = BASE.polygons,
        SQRT = Math.sqrt,
        PI = Math.PI,
        PROTO = Print.prototype,
        Polygon = BASE.Polygon,
        newPoint = BASE.newPoint;

    KIRI.newPrint = function(settings, widgets, id) { return new Print(settings, widgets, id) };

    /**
     * @param {Object} settings
     * @param {Widget[]} widgets
     * @constructor
     */
    function Print(settings, widgets, id) {
        this.id = id || new Date().getTime().toString(36);
        this.settings = settings;
        this.widgets = widgets;

        this.group = new THREE.Group();
        this.layerView = [];

        this.time = 0;
        this.lines = 0;
        this.bytes = 0;
        this.output = [];
        this.distance = 0;
        this.bounds = null;
    }

    PROTO.newOut = newOut;
    PROTO.tip2tipEmit = tip2tipEmit;
    PROTO.extrudePerMM = extrudePerMM;
    PROTO.constReplace = constReplace;
    PROTO.poly2polyEmit = poly2polyEmit;
    PROTO.addPrintPoints = addPrintPoints;
    PROTO.poly2polyDepthFirstEmit = poly2polyDepthFirstEmit;

    PROTO.parseGCode = function(gcode, offset) {
        var lines = gcode
            .toUpperCase()
            .replace("X", " X")
            .replace("Y", " Y")
            .replace("Z", " Z")
            .replace("E", " E")
            .replace("F", " F")
            .replace("  ", " ")
            .split("\n");

        var scope = this,
            output = scope.output = [],
            bounds = scope.bounds = {
                max: { x:-Infinity, y:-Infinity, z:-Infinity},
                min: { x:Infinity, y:Infinity, z:Infinity}
            },
            seq = [],
            move = false,
            E0G0 = false,
            G0 = function() {
                move = true;
                if (seq.length > 0) {
                    output.push(seq);
                    seq = [];
                }
            },
            LZ = 0.0,
            pos = {
                X: 0.0,
                Y: 0.0,
                Z: 0.0,
                F: 0.0,
                E: 0.0
            },
            off = {
                x: offset ? offset.x || 0 : 0,
                y: offset ? offset.y || 0 : 0,
                z: offset ? offset.z || 0 : 0
            };

        lines.forEach(function(line) {
            line = line.split(" ");
            if (line.length < 2) return;
            switch (line.shift()) {
                case 'G0':
                    G0();
                case 'G1':
                    line.forEach(function(tok) {
                        pos[tok.charAt(0)] = parseFloat(tok.substring(1));
                    });
                    if (pos.X) bounds.min.x = Math.min(bounds.min.x, pos.X);
                    if (pos.X) bounds.max.x = Math.max(bounds.max.x, pos.X);
                    if (pos.Y) bounds.min.y = Math.min(bounds.min.y, pos.Y);
                    if (pos.Y) bounds.max.y = Math.max(bounds.max.y, pos.Y);
                    if (pos.Z) bounds.min.z = Math.min(bounds.min.z, pos.Z);
                    if (pos.Z) bounds.max.z = Math.max(bounds.max.z, pos.Z);
                    if (pos.E) E0G0 = true;
                    if (E0G0 && pos.E === 0.0) {
                        if (LZ != pos.Z) G0();
                        else move = true;
                    }
                    seq.push(newOut(
                        {x:pos.X + off.x, y:pos.Y + off.y, z:pos.Z + off.z},
                        !move,
                        pos.F
                    ));
                    break;
                case 'M6':
                    break;
            }
            move = false;
            pos.E = 0.0;
            LZ = pos.Z;
        });

        G0();

        scope.lines = lines.length;
        scope.bytes = gcode.length;
    };

    PROTO.setup = function(remote, onupdate, ondone) {
        var scope = this,
            settings = scope.settings,
            mode = settings.mode;

        if (remote) {
            KIRI.work.printSetup(settings, function(reply) {
                if (reply.done) {
                    scope.output = reply.output;
                    ondone();
                } else {
                    onupdate(reply.update, reply.updateStatus)
                }
            });
        } else {
            var driver = KIRI.driver[mode];
            if (driver) driver.printSetup(scope, onupdate);
            else console.log({missing_print_driver: mode});
            ondone();
        }
    };

    PROTO.exportGCode = function(remote, ondone, online) {
        var scope = this,
            settings = scope.settings,
            mode = settings.mode;

        if (remote) {
            KIRI.work.printGCode(function(reply) {
                scope.lines = reply.lines;
                scope.bytes = reply.bytes;
                scope.bounds = reply.bounds;
                scope.distance = reply.distance;
                scope.time = reply.time;
                ondone(reply.gcode);
            });
            return;
        } else {
            var driver = KIRI.driver[mode];
            if (driver && driver.printExport) {
                ondone(driver.printExport(scope, online));
            } else {
                console.log({missing_export_driver: mode});
                ondone(null);
            }
        }
    };

    PROTO.exportLaserGCode = function() {
        return KIRI.driver.LASER.exportGCode(this);
    };

    PROTO.exportSVG = function() {
        return KIRI.driver.LASER.exportSVG(this);
    };

    PROTO.exportDXF = function() {
        return KIRI.driver.LASER.exportDXF(this);
    };

    PROTO.encodeOutput = function() {
        var newout = [], newlayer;

        this.output.forEach(function(layerout) {
            newlayer = [];
            newout.push(newlayer);
            layerout.forEach(function(out) {
                if (out.point) newlayer.push({emit:out.emit, point:{x:out.point.x, y:out.point.y, z:out.point.z}});
            });
        });
        return newout;
    };

    PROTO.render = function() {
        var scope = this,
            mode = scope.settings.mode;

        switch (mode) {
            case 'CAM':
            case 'FDM':
                scope.renderMoves(true, 0x0088aa);
                break;
            case 'LASER':
                scope.renderMoves(false, 0x0088aa);
                break;
        }
    };

    PROTO.renderMoves = function(showMoves, moveColor) {
        var scope = this, last, view;
        // render layered output
        scope.lines = 0;
        scope.output.forEach(function(layerout) {
            var move = [], print = [], z;
            layerout.forEach(function(out) {
                if (last) {
                    if (UTIL.distSq(last, out.point) < 0.001 && out.point.z === last.z) {
                        return;
                    }
                    if (out.emit > 0) {
                        print.push(last);
                        print.push(out.point);
                    } else {
                        move.push(last);
                        move.push(out.point);
                    }
                } else {
                    if (out.emit) DBUG.log("first point is emit");
                    z = out.point.z;
                }
                last = out.point;
            });
            view = KIRI.newLayer(scope.group);
            scope.layerView.push(view);
            if (showMoves) view.lines(move, moveColor);
            view.lines(print, 0x5566aa);
            view.render();
            scope.lines += print.length;
        });
    }

    PROTO.getLayerCount = function() {
        return this.output.length;
    }

    PROTO.hide = function() {
        this.layerView.forEach(function(layer) {
            layer.setVisible(false);
        })
    };

    PROTO.showLayer = function(index, show) {
        if (this.layerView[index]) this.layerView[index].setVisible(show);
    };

    /**
     * @constructor
     */
    function Output(point, emit, speed, tool) {
        this.point = point; // point to emit
        this.emit = emit; // emit (feed for printers, power for lasers, cut for cam)
        this.speed = speed;
        this.tool = tool;
    }

    /**
     * @param {Point} point
     * @param {number} emit (0=move, !0=filament emit/laser on/cut mode)
     * @param {number} [speed] speed
     * @param {number} [tool] tool
     */
    function newOut(point, emit, speed, tool) {
        return new Output(point, emit, speed, tool);
    }

    /**
     *
     * @param {Polygon} poly
     * @param {Point} startPoint
     * @param {Array} output
     * @param {number} [extrude] multiplier
     * @param {number} [extrude] wipe distance
     * @return {Point} last output point
     */
    PROTO.polyPrintPath = function(poly, startPoint, output, extrude, wipe) {
        // poly.setClosed();
        poly.setClockwise();

        var mindist = Infinity,
            closest = poly.findClosestPointTo(startPoint),
            dist,
            first = true,
            settings = this.settings,
            shellMult = extrude || settings.process.outputShellMult;

        poly.forEachPoint(function(point) {
            if (first) {
                // move from startPoint to point
                output.push(newOut(point, 0));
                first = false;
            } else {
                output.push(newOut(point, shellMult));
            }
        }, true, closest.index);

        if (wipe) {
            wipe = Math.min(wipe, poly.perimeter());
            poly.forEachSegment(function(point, next) {
                // exit loop when no more wipe
                if (!(wipe && wipe > 0.1)) return true;
                dist = point.distTo2D(next);
                if (dist <= wipe) {
                    output.push(newOut(next, 0));
                    wipe -= dist;
                } else {
                    output.push(newOut(point.followTo(next, wipe), 0));
                    return true;
                }
            }, false, closest.index);
        }

        return output[output.length - 1].point;
    };

    /**
     * create 3d print output path for this slice
     *
     * @parma {Slice} slice
     * @param {Point} startPoint start as close as possible to startPoint
     * @param {THREE.Vector3} offset
     * @param {Point[]} output points
     * @param {boolean} isFDM controls whether we emit wipe or not
     * @return {Point} last output point
     */
    PROTO.slicePrintPath = function(slice, startPoint, offset, output, isFDM) {
        var i,
            preout = [],
            scope = this,
            settings = this.settings,
            process = settings.process,
            minSeek = settings.device.nozzleSize * 1.5,
            wipeDist = process.outputWipeDistance, // todo disable for laser mode
            fillMult = process.outputFillMult,
            seekMult = fillMult * 0.5,
            origin = startPoint.add(offset),
            extrude = process.outputShellMult || (process.laserSliceHeight >= 0 ? 1 : 0),
            z = slice.z;

        function outputTraces(poly, extrude, last) {
            if (!poly) return;
            if (Array.isArray(poly)) {
                outputOrderClosest(poly, function(next) {
                    outputTraces(next, extrude, last);
                });
            } else {
                startPoint = scope.polyPrintPath(poly, startPoint, preout, extrude, isFDM && last ? wipeDist : 0);
            }
        }

        /**
         * @param {Polygon[]} polys
         */
        function outputSparse(polys) {
            if (!polys) return;
            var lines = [], p1, p2, iter;
            polys.forEach(function(poly) {
                poly.forEachSegment(function(p1,p2) {
                    lines.push(p1.clone());
                    lines.push(p2.clone());
                }, true);
            });
            outputFills(lines);
        }

        function outputFills(lines, extrude) {
            var mindist, p1, p2, dist, point, find,
                printMult = extrude || fillMult;
            while (lines) {
                find = null;
                mindist = Infinity;
                for (i=0; i<lines.length; i++) {
                    point = lines[i];
                    if (point.del) continue;
                    dist = SQRT(startPoint.distToSq2D(point));
                    if (dist < mindist) {
                        find = {i:i, p:point};
                        mindist = dist;
                    }
                }
                if (find) {
                    if (find.i % 2 === 0) {
                        p1 = find.p;
                        p2 = lines[find.i + 1];
                    } else {
                        p1 = find.p;
                        p2 = lines[find.i - 1];
                    }
                    p1.del = true;
                    p2.del = true;
                    preout.push(newOut(p1, SQRT(startPoint.distToSq2D(p1)) < minSeek ? seekMult : 0));
                    preout.push(newOut(p2, printMult));
                    startPoint = p2;
                } else {
                    break;
                }
            }
            // clear delete marks so we can re-print later
            if (lines) lines.forEach(function(p) { p.del = false });
        }

        /**
         * given array of polygons, emit them in next closest order
         * @param {Array} array of Polygon or Polygon wrappers
         * @param {Function} fn
         * @param {Function} fnp convert 'next' object into a Polygon
         */
        function outputOrderClosest(array, fn, fnp) {
            array = array.slice();
            var closest, find, next, poly;
            for (;;) {
                closest = null;
                for (i=0; i<array.length; i++) {
                    next = array[i];
                    if (!next) continue;
                    poly = fnp ? fnp(next) : next;
                    find = poly.findClosestPointTo(startPoint);
                    if (!closest || find.distance < closest.distance) {
                        closest = find;
                        closest.i = i;
                        closest.next = next;
                    }
                }
                if (!closest) return;
                array[closest.i] = null;
                fn(closest.next);
            }
        }

        var all = [].appendAll(slice.supports || []).appendAll(slice.tops || []);
        outputOrderClosest(all || [], function(next) {
            if (next instanceof Polygon) {
                // support polygon
                next.setZ(z);
                outputTraces(next, extrude);
                outputTraces(next.inner, extrude);
                if (next.fills) {
                    next.fills.forEach(function(p) { p.z = z });
                    outputFills(next.fills, extrude);
                }
            } else {
                // top object
                outputTraces(next.traces, extrude);
                outputTraces(next.innerTraces(), extrude);
                outputFills(next.fill_lines);
                outputSparse(next.fill_sparse);
            }
        }, function(obj) {
            return obj instanceof Polygon ? obj : obj.poly;
        });

        // offset print points
        for (i=0; i<preout.length; i++) {
            preout[i].point = preout[i].point.add(offset);
        }

        // add offset points to total print
        addPrintPoints(preout, output, origin);

        return startPoint.add(offset);
    };

    /**
     *
     * @param {Output[]} input
     * @param {Point[]} output
     * @param {Point} [startPoint]
     */
    function addPrintPoints(input, output, startPoint) {
        if (startPoint && input.length > 0) {
            output.push(newOut(startPoint, 0));
        }
        output.appendAll(input);
    }

    /**
     * emit each element in an array based on
     * the next closest endpoint.
     * todo replace outputFills() with this
     */
    function tip2tipEmit(array, startPoint, emitter) {
        var mindist, dist, found, count = 0;

        for (;;) {
            found = null;
            mindist = Infinity;
            array.forEach(function(el) {
                if (el.delete) return;
                dist = startPoint.distTo3D(el.first);
                if (dist < mindist) {
                    found = {el:el, first:el.first, last:el.last};
                    mindist = dist;
                }
                dist = startPoint.distTo3D(el.last);
                if (dist < mindist) {
                    found = {el:el, first:el.last, last:el.first};
                    mindist = dist;
                }
            });
            if (found) {
                found.el.delete = true;
                startPoint = found.last;
                emitter(found.el, found.first, ++count);
            } else {
                break;
            }
        }

        return startPoint;
    }

    /**
     * like tip2tipEmit but accepts an array of
     * polygons and the next closest point can
     * be anywhere in the adjacent polygon
     */
    function poly2polyEmit(array, startPoint, emitter) {
        var mindist, dist, found, count = 0;
        for (;;) {
            found = null;
            mindist = Infinity;
            array.forEach(function(poly) {
                if (poly.delete) return;
                if (poly.isOpen()) {
                    const d2f = startPoint.distTo2D(poly.first());
                    const d2l = startPoint.distTo2D(poly.first());
                    if (d2f > mindist && d2l > mindist) return;
                    if (d2l < mindist && d2l < d2f) {
                        poly.reverse();
                        found = {poly:poly, index:0, point:poly.first()};
                    } else if (d2f < mindist) {
                        found = {poly:poly, index:0, point:poly.first()};
                    }
                    return;
                }
                poly.forEachPoint(function(point, index) {
                    dist = startPoint.distTo3D(point);
                    if (dist < mindist) {
                        found = {poly:poly, index:index, point:point};
                        mindist = dist;
                    }
                });
            });
            if (found) {
                found.poly.delete = true;
                startPoint = emitter(found.poly, found.index, ++count, startPoint) || found.point;
            } else {
                break;
            }
        }

        // undo delete marks
        array.forEach(function(poly) { poly.delete = false });

        return startPoint;
    }

    /**
     * @param {Polygon[][]} array of array of polygons representing each layer (top down)
     * @param {Point} startPoint entry point for algorithm
     * @param {Function} emitter called to emit each polygon
     * @param {number} offset tool diameter used for this depth-first cut
     *
     * used for CAM depth first layer output
     */
    function poly2polyDepthFirstEmit(array, startPoint, emitter, offset) {
        var layers = [],
            pools;

        array.forEach(function(layerPolys, layerIndex) {
            pools = [];
            layers.push(pools);

            // flattening but preserving inner relationships
            // allows iterating over all layer polys to determine
            // if they deserve their own pool
            flattenPolygons(POLY.nest(layerPolys, true, true)).sort(function(p1,p2) {
                // sort by area descending
                return p2.area() - p1.area();
            }).forEach(function (poly) {
                // a polygon should be made into a pool if:
                // - it is open
                // - it has more than one sibling
                // - it has no parent (top/outer most)
                // - it is offset from its parent by more than diameter
                if (poly.isOpen() || !poly.parent || poly.parent.innerCount() > 1 || !polygonWithinOffset(poly, poly.parent, offset)) {
                    pools.push(poly);
                    poly.pool = [];
                    poly.poolsDown = [];
                } else {
                    // otherwise walk up the parent tree to find a pool to join
                    var search = poly.parent;
                    // walk up until pool found
                    while (search && !search.pool) {
                        search = search.parent;
                    }
                    // open polygons can be unparented and without a pool
                    if (!search) {
                        console.log({orphan:poly});
                        return;
                    }
                    // add to pool
                    search.pool.push(poly);
                }
            });

            // sort pools increasing in size to aid fitting from below
            pools.sort(function (p1, p2) {
                return p1.area() - p2.area();
            });

            // add add pools to smallest enclosing pool in layer above
            const poolsAbove = layers[layerIndex - 1];

            if (layerIndex > 0)
            pools.forEach(function(pool) {
                for (var i=0; i<poolsAbove.length; i++) {
                    const above = poolsAbove[i];
                    // can only add open polys to open polys
                    if (above.isOpen() && pool.isClosed()) {
                        // console.log({skip_open_above:above});
                        continue;
                    }
                    // if pool fits into smallest above pool, add it and break
                    if (polygonFitsIn(pool, above, 0.1)) {
                        above.poolsDown.push(pool);
                        return;
                    }
                }
            });
        });

        const emitPool = function(poolPoly) {
            if (poolPoly.mark) return;
            poolPoly.mark = true;
            const polys = poolPoly.pool.slice().append(poolPoly);
            startPoint = poly2polyEmit(polys, startPoint, emitter);
            poolPoly.poolsDown.forEach(function(downPool) {
                emitPool(downPool);
            });
        };

        // from the top layer, iterate and descend through all connected pools
        // pools are sorted smallest to largest. pools are polygons with an
        // attached 'pool' array of polygons
        layers.forEach(function(pools) {
            pools.forEach(function(poolPoly) {
                emitPool(poolPoly);
            });
        })
        return startPoint;
    }

    /**
     * flatten deeply nested polygons preserving inner arrays
     *
     * @param {Polygon | Polygon[]} poly or array to flatten
     * @param {Polygon[]} to
     * @returns {Polygon[]}
     */
    function flattenPolygons(poly, to) {
        if (!poly) return;
        if (!to) to = [];
        if (Array.isArray(poly)) {
            poly.forEach(function(p) {
                flattenPolygons(p, to);
            })
        } else {
            to.push(poly);
            flattenPolygons(poly.inner, to);
        }
        return to;
    }

    function polygonFitsIn(inside, outside, tolerance) {
        return inside.isInside(outside, tolerance);
        // return inside.area() <= outside.area() + tolerance &&
        //     (polygonWithinOffset(inside, outside, tolerance) || inside.isInside(outside, tolerance));
    }

    function polygonWithinOffset(poly1, poly2, offset) {
        return polygonMinOffset(poly1, poly2, offset) <= offset;
    }

    function polygonMinOffset(poly1, poly2, offset) {
        var mindist = Infinity;
        poly1.forEachPoint(function(p) {
            const nextdist = p.distToPolySegments(poly2, offset);
            mindist = Math.min(mindist, nextdist);
            // returning true terminates forEachPoint()
            if (mindist <= offset) return true;
        });
        return mindist;
    }

    /**
     * @param noz nozzle diameter
     * @param fil filament diameter
     * @param slice height in mm
     * @returns filament extruded per mm
     */
    function extrudePerMM(noz, fil, slice) {
        return ((PI * UTIL.sqr(noz/2)) /
            (PI * UTIL.sqr(fil/2))) *
            (slice / noz);
    }

    function constOp(tok, consts, opch, op) {
        var pos, v1, v2;
        if ((pos = tok.indexOf(opch)) > 0) {
            v1 = consts[tok.substring(0,pos)] || 0;
            v2 = parseInt(tok.substring(pos+1)) || 0;
            return op(v1,v2);
        } else {
            return null;
        }
    }

    function constReplace(str, consts, start) {
        var cs = str.indexOf("{", start || 0),
            ce = str.indexOf("}", cs),
            tok, nutok, nustr;
        if (cs >=0 && ce > cs) {
            tok = str.substring(cs+1,ce);
            nutok =
                constOp(tok, consts, "-", function(v1,v2) { return v1-v2 }) ||
                constOp(tok, consts, "+", function(v1,v2) { return v1+v2 }) ||
                constOp(tok, consts, "/", function(v1,v2) { return v1/v2 }) ||
                constOp(tok, consts, "*", function(v1,v2) { return v1*v2 }) ||
                consts[tok] || 0;
            nustr = str.replace("{"+tok+"}",nutok);
            return constReplace(nustr, consts, ce+1+(nustr.length-str.length));
        } else {
            return str;
        }
    }

})();