/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */

import { CamOp } from './op.js';
import { Tool } from './tool.js';
import { generate as topo4_generate } from './topo4.js';
import { newPoint } from '../../../geo/point.js';

function createFilter(op) {
    let filter = slices => slices;
    if (op.filter) {
        try {
            const obj = eval(`( ${op.filter.join('\n')} )`);
            let idx = 0;
            if (obj && obj.slices) {
                const nadd = [];
                filter = function (slices) {
                    for (let slice of slices) {
                        if (obj.slices(slice, idx++)) {
                            nadd.push(slice);
                        }
                    }
                    return nadd;
                };
            }
        } catch (e) {
            console.log('filter parse error', e, op.filter);
        }
    }
    return filter;
}

class OpLathe extends CamOp {
    constructor(state, op) {
        super(state, op);
    }

    async slice(progress) {
        let { op, state } = this;
        let { addSlices } = state;
        let filter = createFilter(op);

        this.topo = await topo4_generate({
            op,
            state,
            onupdate: (pct, msg) => {
                progress(pct, msg);
            },
            ondone: (slices) => {
                slices = filter(slices);
                this.slices = slices;
                addSlices(slices, false);
            }
        });
    }

    prepare(ops, progress) {
        let { op, state, slices, topo } = this;
        let { settings } = state;

        let { setTool, setSpindle, setPrintPoint } = ops;
        let { camOut, newLayer, printPoint } = ops;
        let { zmax } = ops;

        let toolDiam = new Tool(settings, op.tool).fluteDiameter();
        let stepover = toolDiam * op.step * 2;
        let rez = topo.resolution;

        setTool(op.tool, op.rate, op.plunge);
        setSpindle(op.spindle);

        // start top center, X = 0, Y = 0 closest to 4th axis chuck
        printPoint = newPoint(0, 0, zmax);

        for (let slice of slices) {
            // ignore debug slices
            if (!slice.camLines) {
                continue;
            }

            let last;
            for (let path of slice.camLines) {
                let latent;
                path.forEachPoint((point, pidx) => {
                    if (last) {
                        const dz = Math.abs(last.z - point.z);
                        if (dz < rez) {
                            // latent point should still be included in
                            // preview b/c arcs would look like straight lines
                            latent = point.clone();
                            return;
                        }
                        if (latent) {
                            camOut(latent, true, stepover);
                            latent = undefined;
                        }
                    }
                    camOut(last = point.clone(), pidx > 0, stepover);
                }, false);
                if (latent) {
                    camOut(latent, true, stepover);
                }
            }

            newLayer();
        }

        // move to safe height and reset A axis
        let last = ops.lastPoint();
        let amax = (Math.round(last.a / 360) * 360).round(2);
        // camOut(last = last.clone().setZ(zmax), 0);
        // camOut(last = last.clone().setA(amax), 0);
        newLayer();
        ops.addGCode([`G0 Z${zmax.round(2)}`, `G0 A${amax}`, "G92 A0"]);

        setPrintPoint(last);
    }
}

export { OpLathe };