addToLibrary({
  open_filepicker: function() {
    window.filePicker.show();
  },
  set_filter: function(filter) {
    window.filePicker.setFilter(Module.UTF8ToString(filter));
  },
  file_picker_confirmed: function() {
    return window.filePicker.wasConfirmed();
  },
  file_picker_closed: function() {
    return window.filePicker.wasClosed();
  },
  file_picker_cancelled: function() {
    return window.filePicker.wasCancelled();
  },
  get_first_file: function() {
    if (window.filePicker.wasConfirmed()) {
      let output = window.filePicker.getFirstFile();
      let len = Module.lengthBytesUTF8(output) + 1;
      let outptr = Module._malloc(len);
      for (let i = 0; i < len; i++) {
        setValue(outptr + i, 0, 'i8');
      }
      Module.stringToUTF8(output, outptr, len);
      return outptr;
    } else {
      return 0;
    }
  },
  file_picker_visible: function() {
    return window.filePicker.visible;
  },
  file_picker_loading: function() {
    return window.filePicker.loading;
  },
  clear_file_selection: function() {
    window.filePicker.clearSelection();
  },
  get_size: function(x, y) {
    let canvas = document.getElementById("canvas");
    setValue(x, canvas.offsetWidth, "i32");
    setValue(y, canvas.offsetHeight, "i32");
  },
  is_puter_enabled: function() {
    return window.puterEnabled;
  },
  enable_puter: function(enable) {
    window.puterEnabled = enable;
  },
  write_storage: async function(keyPtr, valuePtr, valueLen) {
    let key = Module.UTF8ToString(keyPtr)
    /**
     * @type {Uint8Array}
     */
    let valueData = HEAPU8.subarray(valuePtr, valuePtr + valueLen)
    let valueBase64 = window.bytesToBase64(valueData);
    if (valueBase64 === null) {
      console.error("Couldn't encode key '", key, "' to base64.");
      return;
    }
    if (window.puterEnabled) {
      value = await puter.kv.set(key, valueBase64);
    }
    localStorage.setItem(key, valueBase64);
  },
  remove_storage: async function(keyPtr) {
    let key = Module.UTF8ToString(keyPtr)
    if (window.puterEnabled) {
      await puter.kv.del(key)
    }
    localStorage.removeItem(Module.UTF8ToString(key));
  },
  get_dpi: function() {
    return window.devicePixelRatio;
  },
  read_storage: async function(keyPtr, valuePtr, lenPtr) {
    let key = Module.UTF8ToString(keyPtr);
    let valueBase64 = localStorage.getItem(key);
    if (window.puterEnabled) {
      let puterValue = await puter.kv.get(key)
      if (puterValue !== null) {
        valueBase64 = puterValue;
      }
    }
    if (valueBase64 === null) {
      console.error("Could not find key '", key, "'.")
    }
    /**
     * @type {Uint8Array|null}
     */
    let value = null;
    try {
      value = window.base64ToBytes(valueBase64)
    } catch (e) {
      console.error(e)
      value = null;
    }
    if (value == null) {
      console.error("Could not decode key '", key, "'.")
    } else {
      let len = value.length;
      let outptr = Module._malloc(len + 1);
      for (let i = 0; i < len; i++) {
        setValue(outptr + i, value[i], 'i8');
      }
      if (lenPtr !== 0) {
        setValue(lenPtr, value.length, "i32")
      }
      setValue(outptr + len, 0, 'i8')
      setValue(valuePtr, outptr, "i32");
    }
  },
  find_keys: async function(prefixPtr, pppOut) {
    let prefix = Module.UTF8ToString(prefixPtr);
    let storageLen = localStorage.length;
    let puterList = [];
    if (window.puterEnabled) {
      puterList = await puter.kv.list(false);
    }
    let arr = [];
    let dict = {};
    for (let i = 0; i < storageLen; i++) {
      let key = localStorage.key(i);
      if (key.startsWith(prefix)) {
        let base64Test = localStorage.getItem(key);
        try {
          window.base64ToBytes(base64Test)
        } catch (e) {
          continue;
        }
        arr = [...arr, key];
        dict[key] = true;
      }
    }
    if (window.puterEnabled) {
      for (let i = 0; i < puterList.length; i++) {
        let key = puterList[i];
        if (key.startsWith(prefix)) {
          if (dict[key] !== true) { 
            let base64Test = await puter.kv.get(key);
            try {
              window.base64ToBytes(base64Test)
            } catch (e) {
              continue;
            }
            arr = [...arr, key];
          }
        }
      }
    }
    let arrLen = arr.length;
    let ptrLen = arrLen + 1;
    let arrOutPtr = Module._malloc(ptrLen * 4);
    
    for (let i = 0; i < ptrLen; i++) {
      setValue(arrOutPtr + (i * 4), 0, 'i32');
    }

    for (let i = 0; i < arrLen; i++) {
      let len = Module.lengthBytesUTF8(arr[i]) + 1;
      let outptr = Module._malloc(len);
      for (let j = 0; j < len; j++) {
        setValue(outptr + j, 0, 'i8');
      }
      Module.stringToUTF8(arr[i], outptr, len);
      setValue(arrOutPtr + (i * 4), outptr, "i32");
    }
    setValue(pppOut, arrOutPtr, "i32")
  },
  quit: function() {
    puter.exit();
  }
})