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

import { api } from './api.js';
import { noop } from './utils.js';
import { version } from '../moto/license.js';

// this code runs in kiri's main loop
let debug = self.debug === true,
    time = Date.now,
    seqid = 1,
    syncd = {},
    running = {},
    worker = null,
    minions = false,
    restarting = false;

/**
 * @param {Function} fn name of function in kiri.worker
 * @param {Object} data to send to server
 * @param {Function} onreply function to call on reply messages
 * @param {Object[]} zerocopy array of objects to pass using zerocopy
 */
function send(fn, data, onreply, zerocopy) {
    let seq = seqid++;

    if (onreply) {
        // track it only when we expect and can handle a reply
        running[seq] = { fn:onreply };
    }
    let msg = {
        seq: seq,
        task: fn,
        time: time(),
        data: data
    };
    // console.log('client send', msg);
    // if (!fn) { console.trace({empty_fn: data}) };
    try {
        worker.postMessage(msg, zerocopy);
    } catch (error) {
        console.trace('work send error', {data, error});
    }
}

// code is running in the browser / client context
export const client = {
    send: send,

    pool: {
        start() {
            minions = true;
            send("pool_start", {}, noop);
        },

        stop() {
            minions = false;
            send("pool_stop", {}, noop);
        }
    },

    newWorker() {
        if (self.createWorker) {
            return self.createWorker();
        } else if (self.kiri_work) {
            const work = atob(self.kiri_work);
            const blob = new Blob([ work ], { type: 'application/javascript' });
            return new Worker(URL.createObjectURL(blob));
        } else {
            let worker = new Worker(`/v2/lib/kiri-run/worker.js`, { type: 'module' });
            worker.onerror = (error) => {
                console.log({ WORKER_ERROR: error });
                error.preventDefault();
            };
            worker.onmessageerror = (error) => {
                console.log({ WORKER_MESSAGE_ERROR: error });
                error.preventDefault();
            };
            console.log({ worker });
            return worker;
        }
    },

    isBusy() {
        let current = 0;

        for (let rec of Object.values(running)) {
            if (rec.fn) current++;
        }
        return current > 0;
    },

    restart() {
        // prevent re-entry from cancel callback
        if (restarting) {
            return;
        }

        if (worker) {
            worker.terminate();
        }

        restarting = true;

        for (let key in running) {
            let rec = running[key];
            if (rec.fn) {
                rec.fn({error: "cancelled operation"});
            }
        }

        syncd = {};
        running = {};
        worker = client.newWorker();

        client.onmessage = worker.onmessage = function(e) {
            let now = time(),
                reply = e.data,
                record = running[reply.seq],
                onreply = record ? record.fn : undefined;

            // console.log('client recv', e)
            if (reply.done) {
                delete running[reply.seq];
            }

            // calculate and replace recv time
            reply.time_recv = now - reply.time_recv;

            if (onreply) {
                onreply(reply.data, reply);
            } else {
                console.log({unexpected_reply: reply});
            }
        };

        // restart minions if they were running
        if (minions) {
            client.pool.start();
        }

        restarting = false;
    },

    config(obj) {
        send("config", obj, noop);
    },

    clear() {
        syncd = {};
        send("clear", {}, noop);
    },

    snap(data) {
        send("snap", data, noop);
    },

    png(data, ondone) {
        send("png", data, ondone);
    },

    // widget sync
    sync(widgets) {
        if (!widgets) {
            widgets = api.widgets.all();
        }
        // sync any widget that has changed
        for (let widget of widgets.filter(w => w.modified || !syncd[w.id])) {
            syncd[widget.id] = true;
            let vertices = widget.getGeoVertices();
            send("sync", {
                id: widget.id,
                meta: widget.meta,
                group: widget.group.id,
                track: widget.track,
                vertices,
                position: widget.mesh.position,
            }, done => {
                widget.modified = false;
            });
        }
    },

    // for belt / angled printing
    rotate(settings, callback) {
        send("rotate", { settings }, reply => {
            if (reply.group) {
                // collect post-rotation data for slice/preview renders
                for (let widget of kiri.Widget.Groups.forid(reply.group)) {
                    widget.belt = reply.belt;
                }
            } else if (callback) {
                callback();
            }
        });
    },

    // called once for each widget
    slice(settings, widget, callback) {
        console.log('CSLICE', { settings, widget, callback });
        send("slice", {
            id: widget.id,
            anno: widget.annotations(),
            settings: settings
        }, reply => {
            callback(reply);
            if (reply.done || reply.error) {
                // in belt mode, slicing modifies a widget and requires re-sync
                if (settings.device.bedBelt) {
                    widget.modified = true;
                }
            }
        });
    },

    // called once after each widget is sliced
    // performs merged actions that consider all widget slice data
    sliceAll(settings, callback) {
        send("sliceAll", { settings }, callback);
    },

    // turn widget slices into unified path output
    prepare(settings, update, done) {
        send("prepare", { settings }, reply => {
            if (reply.progress) {
                update(reply.progress, reply.message, reply.layer);
            }
            if (reply.done) {
                done(reply.output, reply.maxSpeed, reply.minSpeed);
            }
            if (reply.error) {
                done(reply);
            }
        });
    },

    // convert path output to gcode or other target file output
    export(settings, online, ondone) {
        send("export", { settings }, reply => {
            if (reply.line) {
                online(reply.line);
            }
            if (reply.done) {
                ondone(reply.output);
            }
            if (reply.error) {
                ondone(null, reply.error);
            }
            if (reply.debug) {
                api.event.emit("export.debug", reply.debug);
            }
        });
    },

    colors(colors, max, done) {
        send("colors", { colors, max }, reply => {
            done(reply);
        });
    },

    parse(args, progress, done) {
        // have to do this client side because DOMParser is not in workers
        if (args.type === 'svg') {
            const { settings, code, type } = args;
            const origin = settings.origin;
            const offset = {
                x: origin.x,
                y: -origin.y,
                z: origin.z
            };
            const output = kiri.newPrint().parseSVG(code, offset);
            send("parse_svg", output, reply => {
                if (reply.parsed) {
                    done(kiri.codec.decode(reply.parsed));
                }
            });
            return;
        }
        send("parse", args, reply => {
            if (reply.progress) {
                progress(reply.progress);
            }
            if (reply.parsed) {
                done(kiri.codec.decode(reply.parsed), reply.maxSpeed, reply.minSpeed);
            }
        });
    },

    image2mesh(data, progress, output) {
        send("image2mesh", data, reply => {
            if (reply.progress) {
                progress(reply.progress);
            }
            if (reply.vertices) {
                output(reply.vertices);
            }
        }, [ data.png ]);
    },

    gerber2mesh(data, progress, output) {
        send('gerber2mesh', data, reply => {
            if (reply.progress) {
                progress(reply.progress);
            }
            if (reply.vertices) {
                output(reply.vertices);
            }
        });
    },

    zip(files, progress, output) {
        send("zip", {files}, reply => {
            if (reply.percent !== undefined) {
                progress(reply);
            } else {
                output(reply);
            }
        });
    },

    wasm(enable) {
        send("wasm", {enable}, reply => {
            // console.log({wasm_worker_said: reply});
        });
    },

    putCache(key, data) {
        console.log({ putCache: key, data });
        send("putCache", {key, data}, reply => {
            // console.log({ putCache_reply: reply });
        });
    },

    clearCache() {
        send("clearCache", {}, reply => {
            // console.log({ clearCache_reply: reply });
        });
    }
};

// start worker
client.restart();

self.kiri_client = client;

export default client;