var statusElement = document.getElementById('status');
var progressElement = document.getElementById('progress');
var spinnerElement = document.getElementById('spinner');
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;
    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;
    }
    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();
        }
    }
    wasCancelled() {
        return !this.visible && this.cancelled
    }
    wasClosed() {
        return !this.visible && this.closed;
    }
    wasConfirmed() {
        return !this.visible && this.closed && !this.cancelled;
    }
    isLoading() {

    }
    getFileList() {
        if (this.wasConfirmed()) {
            return this.value;
        } else {
            return null;
        }
    }
    getFirstFile() {
        if (this.wasConfirmed()) {
            if (this.value.length > 0) {
                return this.value[0];
            }
        }
        return null;
    }
    clearSelection() {
        this.closed = false;
        this.cancelled = false;
        this.visible = false;
        this.el.value = null;
        this.value = null;
    }
    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;
    }
    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
        };
    }
    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]);
            }
        })
    }
}
window.puterEnabled = false;
window.filePicker = new FilePicker()/*
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("/");
*/
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
*/
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
];

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;
}

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;
}

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);
}

window.base64encode = function(str, encoder = new TextEncoder()) {
	return bytesToBase64(encoder.encode(str));
}

window.base64decode = function(str, decoder = new TextDecoder()) {
	return decoder.decode(base64ToBytes(str));
}