import type { ListGridAPI, MaybePromise } from "../../../ts-types";
import { browser, event, then } from "../../../internal/utils";
import { EventHandler } from "../../../internal/EventHandler";
import { createElement } from "../../../internal/dom";
import { setInputValue } from "./input-value-handler";

const CLASSNAME = "cheetah-grid__small-dialog-input";
const INPUT_CLASSNAME = `${CLASSNAME}__input`;
const HIDDEN_CLASSNAME = `${CLASSNAME}--hidden`;
const SHOWN_CLASSNAME = `${CLASSNAME}--shown`;

const KEY_ENTER = 13;
const KEY_ESC = 27;

function _focus(input: HTMLInputElement, handler: EventHandler): void {
  const focus = (): void => {
    input.focus();

    const end = input.value.length;
    try {
      if (typeof input.selectionStart !== "undefined") {
        input.selectionStart = end;
        input.selectionEnd = end;
        return;
      }
    } catch (e) {
      //ignore
    }
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    if ((document as any).selection) {
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      const range = (input as any).createTextRange();
      range.collapse();
      range.moveEnd("character", end);
      range.moveStart("character", end);
      range.select();
    }
  };
  handler.tryWithOffEvents(input, "blur", () => {
    focus();
  });
}

function createDialogElement(): HTMLDivElement {
  require("@/columns/action/internal/SmallDialogInputElement.css");
  const element = createElement("div", {
    classList: [CLASSNAME, HIDDEN_CLASSNAME],
  });
  const input = createElement("input", { classList: INPUT_CLASSNAME });
  input.readOnly = true;
  input.tabIndex = -1;
  element.appendChild(input);
  return element;
}

type GetValueResult<T, R> = (
  value: string,
  info: { grid: ListGridAPI<T>; col: number; row: number }
) => R;

type EditorProps<T> = {
  type?: string;
  classList?: string[];
  helperText?: string | GetValueResult<T, string>;
  inputValidator?: GetValueResult<T, MaybePromise<string>>;
  validator?: GetValueResult<T, MaybePromise<string>>;
};

type ActiveData<T> = {
  grid: ListGridAPI<T>;
  col: number;
  row: number;
  editor: EditorProps<T>;
};

function bindProps<T>(
  grid: ListGridAPI<T>,
  dialog: HTMLDivElement,
  input: HTMLInputElement,
  editor: EditorProps<T>
): void {
  const { classList, helperText } = editor;
  if (classList) {
    dialog.classList.add(...classList);
  }
  if (helperText && typeof helperText !== "function") {
    dialog.dataset.helperText = helperText;
  }
  setInputAttrs(editor, grid, input);
}

function unbindProps<T>(
  _grid: ListGridAPI<T>,
  dialog: HTMLDivElement,
  input: HTMLInputElement,
  editor: EditorProps<T>
): void {
  const { classList } = editor;
  if (classList) {
    dialog.classList.remove(...classList);
  }
  delete dialog.dataset.helperText;
  input.type = "";
}

function setInputAttrs<T>(
  editor: EditorProps<T>,
  _grid: ListGridAPI<T>,
  input: HTMLInputElement
): void {
  const { type } = editor;
  input.type = type || "";
}

export class SmallDialogInputElement<T> {
  private _handler: EventHandler;
  private _dialog: HTMLDivElement;
  private _input: HTMLInputElement;
  private _beforePropEditor?: EditorProps<T> | null;
  private _activeData?: ActiveData<T> | null;
  private _attaching?: boolean;
  private _beforeValue?: string | null;
  static setInputAttrs<T>(
    editor: EditorProps<T>,
    grid: ListGridAPI<T>,
    input: HTMLInputElement
  ): void {
    setInputAttrs(editor, grid, input);
  }
  constructor() {
    this._handler = new EventHandler();
    this._dialog = createDialogElement();
    this._input = this._dialog.querySelector(
      `.${INPUT_CLASSNAME}`
    ) as HTMLInputElement;
    this._bindDialogEvents();
  }
  dispose(): void {
    const dialog = this._dialog;
    this.detach();
    this._handler.dispose();
    // @ts-expect-error -- ignore
    delete this._dialog;
    // @ts-expect-error -- ignore
    delete this._input;
    this._beforePropEditor = null;
    if (dialog.parentElement) {
      dialog.parentElement.removeChild(dialog);
    }
  }
  attach(
    grid: ListGridAPI<T>,
    editor: EditorProps<T>,
    col: number,
    row: number,
    value: string
  ): void {
    const handler = this._handler;
    const dialog = this._dialog;
    const input = this._input;

    if (this._beforePropEditor) {
      unbindProps(grid, dialog, input, this._beforePropEditor);
    }

    delete dialog.dataset.errorMessage;
    dialog.classList.remove(SHOWN_CLASSNAME);
    dialog.classList.add(HIDDEN_CLASSNAME);
    input.readOnly = true;
    input.tabIndex = 0;
    const { element, rect } = grid.getAttachCellsArea(
      grid.getCellRange(col, row)
    );
    dialog.style.top = `${rect.top.toFixed()}px`;
    dialog.style.left = `${rect.left.toFixed()}px`;
    dialog.style.width = `${rect.width.toFixed()}px`;
    input.style.height = `${rect.height.toFixed()}px`;
    element.appendChild(dialog);

    setInputValue(input, value);

    input.style.font = grid.font || "16px sans-serif";
    const activeData = { grid, col, row, editor };
    this._onInputValue(input, activeData);
    if (!browser.IE) {
      _focus(input, handler);
    } else {
      // On the paste-event on IE, since it may not be focused, it will be delayed and focused.
      setTimeout(() => _focus(input, handler));
    }
    dialog.classList.add(SHOWN_CLASSNAME);
    dialog.classList.remove(HIDDEN_CLASSNAME);
    input.readOnly = false;

    bindProps(grid, dialog, input, editor);

    this._activeData = activeData;
    this._beforePropEditor = editor;

    this._attaching = true;
    setTimeout(() => {
      delete this._attaching;
    });
  }
  detach(gridFocus?: boolean): void {
    if (this._isActive()) {
      const dialog = this._dialog;
      const input = this._input;

      dialog.classList.remove(SHOWN_CLASSNAME);
      dialog.classList.add(HIDDEN_CLASSNAME);
      input.readOnly = true;
      input.tabIndex = -1;

      const { grid, col, row } = this._activeData!;

      const range = grid.getCellRange(col, row);
      grid.invalidateCellRange(range);
      if (gridFocus) {
        grid.focus();
      }
    }
    this._activeData = null;
    this._beforeValue = null;
  }
  _doChangeValue(): MaybePromise<boolean> {
    if (!this._isActive()) {
      return false;
    }
    const input = this._input;
    const { value } = input;
    return then(this._validate(value), (res) => {
      if (res && value === input.value) {
        const { grid, col, row } = this._activeData!;
        grid.doChangeValue(col, row, () => value);
        return true;
      }
      return false;
    });
  }
  _isActive(): boolean {
    const dialog = this._dialog;
    if (!dialog || !dialog.parentElement) {
      return false;
    }
    if (!this._activeData) {
      return false;
    }
    return true;
  }
  _bindDialogEvents(): void {
    const handler = this._handler;
    const dialog = this._dialog;
    const input = this._input;
    const stopPropagationOnly = (e: Event): void => e.stopPropagation(); // gridにイベントが伝播しないように
    handler.on(dialog, "click", stopPropagationOnly);
    handler.on(dialog, "dblclick", stopPropagationOnly);
    handler.on(dialog, "mousedown", stopPropagationOnly);
    handler.on(dialog, "touchstart", stopPropagationOnly);

    handler.on(input, "compositionstart", (_e) => {
      input.classList.add("composition");
    });
    handler.on(input, "compositionend", (_e) => {
      input.classList.remove("composition");
      this._onInputValue(input);
    });
    const onKeyupAndPress = (_e: KeyboardEvent): void => {
      if (input.classList.contains("composition")) {
        return;
      }
      this._onInputValue(input);
    };
    handler.on(input, "keyup", onKeyupAndPress);
    handler.on(input, "keypress", onKeyupAndPress);
    handler.on(input, "keydown", (e) => {
      if (input.classList.contains("composition")) {
        return;
      }
      const keyCode = event.getKeyCode(e);
      if (keyCode === KEY_ESC) {
        this.detach(true);
        event.cancel(e);
      } else if (keyCode === KEY_ENTER) {
        this._onKeydownEnter(e);
      } else {
        this._onInputValue(input);
      }
    });
  }
  _onKeydownEnter(e: KeyboardEvent): void {
    if (this._attaching) {
      return;
    }
    const input = this._input;
    const { value } = input;
    then(this._doChangeValue(), (r) => {
      if (r && value === input.value) {
        const grid = this._isActive() ? this._activeData!.grid : null;
        this.detach(true);

        if (grid?.keyboardOptions?.moveCellOnEnter) {
          grid.onKeyDownMove(e);
        }
      }
    });
    event.cancel(e);
  }
  _onInputValue(input: HTMLInputElement, activeData?: ActiveData<T>): void {
    const before = this._beforeValue;
    const { value } = input;
    if (before !== value) {
      this._onInputValueChange(value, activeData);
    }
    this._beforeValue = value;
  }
  _onInputValueChange(after: string, activeData?: ActiveData<T>): void {
    activeData = (activeData || this._activeData)!;
    const dialog = this._dialog;
    const { grid, col, row, editor } = activeData;
    if (typeof editor.helperText === "function") {
      const helperText = editor.helperText(after, { grid, col, row });
      if (helperText) {
        dialog.dataset.helperText = helperText;
      } else {
        delete dialog.dataset.helperText;
      }
    }
    if ("errorMessage" in dialog.dataset) {
      this._validate(after, true);
    }
  }
  _validate(value: string, inputOnly?: boolean): MaybePromise<boolean> {
    const dialog = this._dialog;
    const input = this._input;
    const { grid, col, row, editor } = this._activeData!;
    let message: MaybePromise<string> = "";
    if (editor.inputValidator) {
      message = editor.inputValidator(value, { grid, col, row });
    }
    return then(message, (message: MaybePromise<string>) => {
      if (!message && editor.validator && !inputOnly) {
        message = editor.validator(value, { grid, col, row });
      }
      return then(message, (message) => {
        if (message && value === input.value) {
          dialog.dataset.errorMessage = message;
        } else {
          delete dialog.dataset.errorMessage;
        }
        return !message;
      });
    });
  }
}