import { openDB } from 'indexed-pdb'
import * as tic from './ticparse.js'
import * as filesize from 'filesize';
import {select, selectAll} from "d3-selection";
import * as CodeMirror from 'codemirror';
import 'codemirror/mode/lua/lua.js';
import 'codemirror/mode/javascript/javascript.js';
import 'codemirror/addon/fold/foldcode.js';
import 'codemirror/addon/fold/foldgutter.js';
//require('codemirror/addon/fold/foldcode.js');
//require('codemirror/addon/fold/foldgutter.js');
//require('codemirror/addon/fold/markdown-fold.js')
//require("codemirror/theme/monokai.css")
var current_item,
    current_filename,
    current_cart;

const DB_NAME = "/com.nesbox.tic/TIC-80",
    DB_STORE = "FILE_DATA",
    TIC_SPECIALS = ["TIC", "SCN", "OVR", "btn", "btnp", "clip", "cls", "circ", "circb", "exit", "fget", "font", "fset", "key", "keyp", "line", "map", "memcpy", "memset", "mget", "mouse", "mset", "music", "peek", "peek4", "pix", "pmem", "poke", "poke4", "print", "rect", "rectb", "reset", "sfx", "spr", "sync", "time", "tstamp", "trace", "tri", "textri"],
    listing = select("#listing"),
    table = listing.append("table"),
    thead = table.append("thead").append("tr"),
    tbody = table.append("tbody"),
    CM_OPTS = {
        // mode: {'name': 'lua', 'specials': TIC_SPECIALS, 'fold': true},
        mode: {'name': 'javascript'},
        theme: 'default',
        lineNumbers: true,
        lineWrapping: true,
        extraKeys: {"Ctrl-S": function(cm){ save(); }},
        foldGutter: true,
        gutters: ["CodeMirror-linenumbers", "CodeMirror-foldgutter"]    
    },
    code = CodeMirror(document.getElementById("code"), CM_OPTS);

listing.append("button").html("save").on("click", (e, d) => {
    if (current_filename) { save(); }
});

listing.append("button").html("save as...").on("click", (e, d) => {
    if (current_filename) {
        var save_filename = prompt("key", current_filename);
        if (save_filename) {
            current_filename = save_filename;
            save();                
        }
    }
});

listing.append("input").attr("type", "file").on("change", function (e, d) {
    console.log("filechange", this.files);
    if (this.files.length == 1) {
        this.files[0].arrayBuffer().then(result => {
            console.log("file", result);
            var file_cart = tic.parsetic(result);
            console.log("file_cart", file_cart);
        })
        // reader.readAsArrayBuffer(this.files[0]);
    }
});

thead.selectAll("th").data(["name", "size", "time", " "]).enter().append("th").html(d => d);

async function save() {
    current_cart.code.text = code.getValue();
    console.log("code", current_cart.code.text);
    current_item.contents = current_cart.tobuffer();
    current_item.timestamp = new Date();
    console.log("save", current_item);
    return await save_key(DB_NAME+"/"+current_filename, current_item);
}

function filename_from_key (key) {
    if (key.startsWith(DB_NAME+"/")) { return key.substr((DB_NAME+"/").length); }
}

(async () => {
    try {
        const db = await openDB(DB_NAME);
        var objectStore = db.transaction([DB_STORE], "readonly").objectStore(DB_STORE);
        var files = [];
        await objectStore.openCursor().then(function push_item(cursor) {
            if (!cursor) { return }
            var filename = filename_from_key(cursor.key);
            if (filename && !filename.startsWith(".")) {
                // console.log(cursor.value.contents);
                var blob = new Blob([cursor.value.contents]);
                // console.log("blob", blob, {type: "application/octet-stream"});
                var objecturl = URL.createObjectURL(blob);
                files.push({
                    key: cursor.key,
                    filename: filename,
                    size: cursor.value.contents.length,
                    timestamp: cursor.value.timestamp,
                    objecturl: objecturl
                });

            }
            return cursor.continue().then(push_item)
        })

        // console.log("files", files);
        let tr = tbody.selectAll("tr").data(files).enter().append("tr");
        tr.append("td").append("a").attr("href", "#").html(d => d.filename).on("click", async (e, d) => {
            e.preventDefault();
            var filename = filename_from_key(d.key);
            if (filename) {
                current_filename = filename;
                current_item = await load_key(DB_NAME+"/"+current_filename);
                console.log("loaded item", current_item);
                current_cart = tic.parsetic(current_item.contents);
                console.log("current_cart", current_cart);
                code.setValue(current_cart.code.text);                
            }
        });
        tr.append("td").html(d => filesize(d.size));
        tr.append("td").html(d => d.timestamp.toLocaleString());
        tr.append("td").append("a").attr("href", d=>d.objecturl).attr("download", d=>d.filename).html("download");
        
    } catch (error) {
        console.log(error, 'any error during the process');
    }

})()

function compareBuffers (a, b) {
    var ad = new DataView(a.buffer),
        bd = new DataView(b.buffer);
    if (ad.byteLength != bd.byteLength) { return false; }
    for (var i=0; i<ad.byteLength; i++) {
        if (ad.getUint8(i, 1) != bd.getUint8(i, 1)) { return false;}
    }
    return true;
}

async function load_key (key) {
    const db = await openDB(DB_NAME),
          objectStore = db.transaction([DB_STORE], "readonly").objectStore(DB_STORE);
    return await objectStore.get(key);
}    

async function save_key (key, item) {
    const db = await openDB(DB_NAME),
          objectStore = db.transaction([DB_STORE], "readwrite").objectStore(DB_STORE);
    return await objectStore.put(item, key);
}