class ChangePasswordViewController extends TimeCardsViewController {
    constructor(element) {
        super(element);

        this.successDialog = new Dialog("The password has been successfully updated.", this.onSuccessDialogDismissed.bind(this), Dialog.BUTTONS_OK_ONLY);
        this.onPasswordChangeErrorBound = this.onPasswordChangeError.bind(this);
    }

    viewWillAppear() {
        TimeCards.dataManager.addStoreErrorListener("user", this.onPasswordChangeErrorBound);
        this.reset();
    }

    viewWillDisappear() {
        TimeCards.dataManager.removeStoreErrorListener("user", this.onPasswordChangeErrorBound);
    }

    reset() {
        if (!this.forcedMode) {
            this.oldPasswordField.value = "";
        }
        this.newPasswordField.value = "";
        this.saveButton.disabled = true;
    }

    onFieldChanged(event) {
        this.saveButton.disabled = !this.changePasswordForm.checkValidity();
    }

    onFormSubmitted(event) {
        event.preventDefault();

        TimeCards.dataManager.store("user", Authentication.currentUser.user_id, {
            old_password: this.oldPasswordField.value,
            password: this.newPasswordField.value
        }, this.onPasswordChanged.bind(this));
    }

    onPasswordChanged(response) {
        this.dismiss();
        this.successDialog.show();
    }

    onPasswordChangeError(key, entity, error) {
        //Do nothing if key is not current user.
        if (key != Authentication.currentUser.user_id) {
            return;
        }

        //Reset disabled state of save button.
        this.onFieldChanged();
    }

    onCancelButtonPressed(event) {
        this.dismiss();
    }

    dismiss() {
        this.setForcedMode(false);
        this.dismissModally();
    }

    /**
     * Prepares this ViewController for forced password reset mode (if forcedMode is true).
     * This is automatically reset when dismissing this ViewController via its own dismiss() function.
     * @param {*} forcedMode Pass true to prepare for forced password reset mode, false to revert back to normal mode.
     * @param {*} oldPassword Optional way to pass the old password. When passed, the old password field is auto-filled and hidden for user convenience.
     * @param {*} callback Optional callback to be called after the password was changed.
     */
    setForcedMode(forcedMode, oldPassword = null, callback = null) {
        this.forcedMode = forcedMode;
        if (this.forcedMode) {
            this.forcedModeCallback = callback;
        }

        this.cancelButton.style.display = this.forcedMode ? "none" : "";
        this.forcedResetLabel.style.display = this.forcedMode ? "" : "none";

        if (this.forcedMode && oldPassword) {
            this.oldPasswordField.value = oldPassword;
            this.oldPasswordField.style.display = "none";
            this.oldPasswordFieldLabel.style.display = "none";
        }
        else {
            this.oldPasswordField.style.display = "";
            this.oldPasswordFieldLabel.style.display = "";
        }
    }

    /**
     * Called when the success dialog has been dismissed.
     * Calls the stored callback for forced mode if one is set.
     */
    onSuccessDialogDismissed() {
        if (this.forcedModeCallback) {
            this.forcedModeCallback();
            this.forcedModeCallback = null;
        }
    }
}
UIKit.registerViewControllerType(ChangePasswordViewController);