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 (this.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()) {
            this.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.filePicker = new FilePicker()