var statusElement = document.getElementById('status');
var progressElement = document.getElementById('progress');
var spinnerElement = document.getElementById('spinner');
/**
 * @typedef {Object} FilePickerWASMFile
 * @property {string} path
 * @property {Object} handle
 */
class FilePicker {
    /**
     * @type {HTMLInputElement}
     */
    el;
    /**
     * @type {boolean}
     */
    visible = false;
    /**
     * @type {boolean}
     */
    cancelled = false;
    /**
     * @type {boolean}
     */
    closed = false;
    /**
     * @type {Array<string>|null}
     */
    value = null;
    /**
     * @type {boolean}
     */
    loading = false;
    /**
     * Sets the filter of the file picker.
     * @param {String} filter 
     */
    setFilter(filter) {
        this.el.setAttribute("accept", filter)
    }
    /**
     * @type {boolean}
     */
    puterEnabled = false;
    /**
     * Opens a file from Puter
     * @param {Object} file 
     */
    async openPuterFile(file) {
        this.loading = true;
        this.value = null;
        this.closed = false;
        this.visible = false;
        this.cancelled = false;
        let fileData = this.openWasmFile(file.name)
        let filePath = fileData.path;
        let handle = fileData.handle;
        await this.writeBlob(handle, await file.read())
        this.value = [filePath];
        this.cancelled = false;
        this.closed = true;
        this.visible = false;
        this.loading = false;
    }
    /**
     * Shows the file picker.
     */
    show() {
        this.visible = true;
        this.closed = false;
        this.cancelled = false;
        this.value = "";
        if (window.puterEnabled) {
            puter.ui.showOpenFilePicker({"accept": this.el.getAttribute("accept"), "multiple": false}).then(this.openPuterFile)
        } else {
            this.el.click();
        }
    }
    /**
     * Checks if the open file dialog was cancelled.
     * @returns true if the dialog was cancelled, false otherwise.
     */
    wasCancelled() {
        return !this.visible && this.cancelled
    }
    /**
     * Checks if the file picker is not visible because it was closed by the user.
     * @returns True if the file picker is not visible because it was closed, false in any other situation
     */
    wasClosed() {
        return !this.visible && this.closed;
    }
    /**
     * Checks if the file picker was confirmed by the user
     * @returns True if the file picker was confirmed, false otherwise
     */
    wasConfirmed() {
        return !this.visible && this.closed && !this.cancelled;
    }
    /**
     * Checks if the file picker is currently loading a file into memory.
     * @returns true if the file picker is loading the file into memory, false otherwise
     */
    isLoading() {
        return this.loading;
    }
    /**
     * Gets the list of files confirmed by the user
     * @returns A list of files picked by the user, or null if the dialog was not confirmed.
     */
    getFileList() {
        if (this.wasConfirmed()) {
            return this.value;
        } else {
            return null;
        }
    }
    /**
     * Gets the first file picked by the user, if any.
     * @returns The first file picked by the user, if the dialog was confirmed and the user actually picked at least one file, null otherwise
     */
    getFirstFile() {
        if (this.wasConfirmed()) {
            if (this.value.length > 0) {
                return this.value[0];
            }
        }
        return null;
    }
    /**
     * Resets the dialog so it can be used again.
     */
    clearSelection() {
        this.closed = false;
        this.cancelled = false;
        this.visible = false;
        this.el.value = null;
        this.value = null;
    }
    /**
     * Creates a randomly-named directory in the WebAssembly filesystem, and returns the path.
     * @returns {string} A randomly generated directory path in the WebAssembly filesystem
     */
    makeWasmDir() {
        let chars ="0123456789bcdfghjklmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ_";
        let output = "/"
        for (let i = 0; i < 16; i++) {
            output += chars.charAt((Math.random() * chars.length) % chars.length)
        }
        FS.mkdir(output)
        output += "/";
        return output;
    }
    /**
     * Opens a file in the WebAssembly filesystem for writing, creating it if it does not exist.
     * @param {string} name 
     * @param {string|null} dir 
     * @returns {FilePickerWASMFile} An object with two 
     */
    openWasmFile(name, dir = null) {
        if (dir === null) {
            dir = this.makeWasmDir();
        }
        let filePath = dir + "/" + name;
        let file = FS.open(filePath, "w+");
        return {
            "path": filePath,
            "handle": file
        };
    }
    /**
     * Writes a blob to a WebAssembly file.
     * @param {Object} file 
     * @param {Blob} blob 
     */
    async writeBlob(file, blob) {
        let data = null;
        let reader = blob.stream().getReader();
        while (data !== undefined) {
            let data = (await reader.read());
            if (data.done) {
                break;
            }
            FS.write(file, data.value, 0, data.value.length);
        }
        FS.close(file);
    }
    constructor() {
        if (puter.auth.isSignedIn()) {
            window.puterEnabled = true;
        }
        this.el = document.getElementById("file-picker")
        this.el.addEventListener("cancel", () => {
            this.value = null;
            this.cancelled = true;
            this.closed = true;
            this.visible = false;
        })
        this.el.addEventListener("change", async () => {
            if (this.el.files.length > 0) {
                this.loading = true;
                this.value = null;
                this.closed = false;
                this.visible = false;
                this.cancelled = false;
                let output = this.makeWasmDir();
                let newValue = []
                for (let i = 0; i < this.el.files.length; i++) {
                    let element = this.el.files[i];
                    let fileData = this.openWasmFile(element.name, output);
                    let file = fileData.handle;
                    let filePath = fileData.path;
                    await this.writeBlob(file, element);
                    newValue = [...newValue, filePath]
                }
                /**
                 * @type {string[]|null}
                 */
                let oldValues = this.value;
                if (oldValues !== null) {
                    setTimeout(() => {
                        for (let i = 0; i < oldValues.length; i++) {
                            /**
                             * @type {string}
                             */
                            let value = oldValues[i];
                            let lastSlash = value.lastIndexOf("/")
                            if (lastSlash === value.length - 1) {
                                value = value.substring(0, lastSlash - 1);
                                lastSlash = value.lastIndexOf("/")
                            }
                            let parent = value.substring(0, lastSlash - 1)
                            FS.unlink(value);
                            if (FS.readdir(parent).length === 2) {
                                FS.rmdir(parent)
                            }
                        }
                    }, 1000)
                }
                this.value = newValue;
                this.cancelled = false;
                this.closed = true;
                this.visible = false;
                this.loading = false;
            } else {
                this.value = null;
                this.cancelled = true;
                this.closed = true;
                this.visible = false;
            }
        })
        puter.ui.onLaunchedWithItems(function(items) {
            for (let i = 0; i < files.length; i++) {
                this.openPuterFile(files[i]);
            }
        })
    }
}
/**
 * @type {boolean}
 */
window.puterEnabled = false;
window.filePicker = new FilePicker()
window.serviceWorkerPossible = function() {
    return "serviceWorker" in navigator;
}
window.serviceWorkerRegistered = function() {
    let controller = navigator.serviceWorker.controller;
    return (serviceWorkerPossible && controller !== undefined && controller !== null)
}
window.registerServiceWorker = function() {
    if (serviceWorkerPossible() && !serviceWorkerRegistered()) {
        navigator.serviceWorker
        .register("serviceWorker.js")
        .then(res => console.log("Service worker registered!"))
        .catch(err => console.error("Failed to register service worker: ", err));
    }
    if ("updateRegisterBtnText" in window) {
        window.updateRegisterBtnText();
    }
}
window.unregisterServiceWorker = function() {
    if (serviceWorkerRegistered()) {
        navigator.serviceWorker.controller.postMessage({
            type: "UNREGISTER"
        });
    }
    if ("updateRegisterBtnText" in window) {
        window.updateRegisterBtnText();
    }
}
window.update = function() {
    if (serviceWorkerRegistered()) {
        navigator.serviceWorker.controller.postMessage({
            type: "UPDATE"
        });
    }
}
window.addEventListener("load", () => {
    if (window.serviceWorkerRegistered()) {
        window.update()
    } else {
        window.registerServiceWorker()
    }
})
/**
 * Allocates memory and converts a string to UTF-8 in the newly allocated memory region
 * @param {string} data 
 * @returns A newly allocated pointer containing the string as UTF-8
 */
window.stringToAllocatedUTF8 = function(data) {
    let len = Module.lengthBytesUTF8(data) + 1;
    let outptr = Module._malloc(len);
    Module._memset(outptr, 0, len);
    Module.stringToUTF8(data, outptr, len);
    return outptr;
}
/**
 * Writes to the log of the WebAssembly program, without adding a newline
 * @param {int} level 
 * @param {string} log 
 */
window.log = function(level, log) {
    Module._write_log(level, window.stringToAllocatedUTF8(log))
}
/**
 * Writes to the log of the WebAssembly program, and adds a newline at the end
 * @param {int} level 
 * @param {string} log 
 */
window.logln = function(level, log) {
    Module._write_logln(level, window.stringToAllocatedUTF8(log))
}
window.loglevel = {
    DEBUG: -1,
    INFO: 0,
    WARNING: 1,
    ERROR: 2
}
/*
MIT License
Copyright (c) 2020 Egor Nepomnyaschih
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

/*
// This constant can also be computed with the following algorithm:
const base64abc = [],
	A = "A".charCodeAt(0),
	a = "a".charCodeAt(0),
	n = "0".charCodeAt(0);
for (let i = 0; i < 26; ++i) {
	base64abc.push(String.fromCharCode(A + i));
}
for (let i = 0; i < 26; ++i) {
	base64abc.push(String.fromCharCode(a + i));
}
for (let i = 0; i < 10; ++i) {
	base64abc.push(String.fromCharCode(n + i));
}
base64abc.push("+");
base64abc.push("/");
*/
/**
 * @type {Array<string>}
 */
const base64abc = [
	"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
	"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
	"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
	"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
	"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "/"
];

/*
// This constant can also be computed with the following algorithm:
const l = 256, base64codes = new Uint8Array(l);
for (let i = 0; i < l; ++i) {
	base64codes[i] = 255; // invalid character
}
base64abc.forEach((char, index) => {
	base64codes[char.charCodeAt(0)] = index;
});
base64codes["=".charCodeAt(0)] = 0; // ignored anyway, so we just need to prevent an error
*/
/**
 * @type {Array<number>}
 */
const base64codes = [
	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
	52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 0, 255, 255,
	255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
	15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
	255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
	41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
];

/**
 * @param {number} charCode 
 * @returns {number}
 */
function getBase64Code(charCode) {
	if (charCode >= base64codes.length) {
		throw new Error("Unable to parse base64 string.");
	}
	const code = base64codes[charCode];
	if (code === 255) {
		throw new Error("Unable to parse base64 string.");
	}
	return code;
}

/**
 * Converts a byte array to base64
 * @param {Uint8Array} bytes 
 * @returns {string} The base64 encoding of the byte array
 */
window.bytesToBase64 = function(bytes) {
	let result = '', i, l = bytes.length;
	for (i = 2; i < l; i += 3) {
		result += base64abc[bytes[i - 2] >> 2];
		result += base64abc[((bytes[i - 2] & 0x03) << 4) | (bytes[i - 1] >> 4)];
		result += base64abc[((bytes[i - 1] & 0x0F) << 2) | (bytes[i] >> 6)];
		result += base64abc[bytes[i] & 0x3F];
	}
	if (i === l + 1) { // 1 octet yet to write
		result += base64abc[bytes[i - 2] >> 2];
		result += base64abc[(bytes[i - 2] & 0x03) << 4];
		result += "==";
	}
	if (i === l) { // 2 octets yet to write
		result += base64abc[bytes[i - 2] >> 2];
		result += base64abc[((bytes[i - 2] & 0x03) << 4) | (bytes[i - 1] >> 4)];
		result += base64abc[(bytes[i - 1] & 0x0F) << 2];
		result += "=";
	}
	return result;
}

/**
 * Converts a base64 string to a byte array.
 * @param {string} str 
 * @returns {Uint8Array} The byte array
 */
window.base64ToBytes = function(str) {
	if (str.length % 4 !== 0) {
		throw new Error("Unable to parse base64 string.");
	}
	const index = str.indexOf("=");
	if (index !== -1 && index < str.length - 2) {
		throw new Error("Unable to parse base64 string.");
	}
	let missingOctets = str.endsWith("==") ? 2 : str.endsWith("=") ? 1 : 0,
		n = str.length,
		result = new Uint8Array(3 * (n / 4)),
		buffer;
	for (let i = 0, j = 0; i < n; i += 4, j += 3) {
		buffer =
			getBase64Code(str.charCodeAt(i)) << 18 |
			getBase64Code(str.charCodeAt(i + 1)) << 12 |
			getBase64Code(str.charCodeAt(i + 2)) << 6 |
			getBase64Code(str.charCodeAt(i + 3));
		result[j] = buffer >> 16;
		result[j + 1] = (buffer >> 8) & 0xFF;
		result[j + 2] = buffer & 0xFF;
	}
	return result.subarray(0, result.length - missingOctets);
}

/**
 * Base64 encodes a string by converting it to a byte array then calling window.bytesToBase64 on it.
 * @param {string} str 
 * @param {TextEncoder} encoder 
 * @returns {string} The base64 encoded version of the string
 */
window.base64encode = function(str, encoder = new TextEncoder()) {
	return bytesToBase64(encoder.encode(str));
}

/**
 * Base64 decodes a string by calling window.base64ToBytes on it then decoding the byte array.
 * @param {string} str 
 * @param {TextDecoder} decoder 
 * @returns {string} The decoded string
 */
window.base64decode = function(str, decoder = new TextDecoder()) {
	return decoder.decode(base64ToBytes(str));
}