import { useRef, useState } from "react";
import Editor from "@monaco-editor/react";
import classNames from "classnames";
import { useMount, useUnmount, useEvent, useLocalStorage } from "react-use";
import { toast } from "react-toastify";

import Header from "./header/header";
import DeployButton from "./deploy-button/deploy-button";
import { defaultHTML } from "../utils/consts";
import Tabs from "./tabs/tabs";
import AskAI from "./ask-ai/ask-ai";
import Preview from "./preview/preview";
import RedirectModal from "./redirect-modal/redirect-modal";

function App() {
  const [htmlStorage, , removeHtmlStorage] = useLocalStorage("html_content");

  const preview = useRef<HTMLDivElement>(null);
  const editor = useRef<HTMLDivElement>(null);
  const resizer = useRef<HTMLDivElement>(null);

  const [isResizing, setIsResizing] = useState(false);
  const [error, setError] = useState(false);
  const [html, setHtml] = useState((htmlStorage as string) ?? defaultHTML);
  const [isAiWorking, setisAiWorking] = useState(false);
  const [showRedirectModal, setShowRedirectModal] = useState(true);

  const resetLayout = () => {
    if (!editor.current || !preview.current) return;

    if (window.innerWidth >= 1024) {
      const resizerWidth = resizer.current?.offsetWidth ?? 8;
      const availableWidth = window.innerWidth - resizerWidth;
      const initialEditorWidth = availableWidth / 3;
      const initialPreviewWidth = availableWidth - initialEditorWidth;
      editor.current.style.width = `${initialEditorWidth}px`;
      preview.current.style.width = `${initialPreviewWidth}px`;
    } else {
      editor.current.style.width = "";
      preview.current.style.width = "";
    }
  };

  const handleResize = (e: MouseEvent) => {
    if (!editor.current || !preview.current || !resizer.current) return;

    const resizerWidth = resizer.current.offsetWidth;
    const minWidth = 100;
    const maxWidth = window.innerWidth - resizerWidth - minWidth;

    const editorWidth = e.clientX;
    const clampedEditorWidth = Math.max(
      minWidth,
      Math.min(editorWidth, maxWidth)
    );
    const calculatedPreviewWidth =
      window.innerWidth - clampedEditorWidth - resizerWidth;

    editor.current.style.width = `${clampedEditorWidth}px`;
    preview.current.style.width = `${calculatedPreviewWidth}px`;
  };

  const handleMouseDown = () => {
    setIsResizing(true);
    document.addEventListener("mousemove", handleResize);
    document.addEventListener("mouseup", handleMouseUp);
  };

  const handleMouseUp = () => {
    setIsResizing(false);
    document.removeEventListener("mousemove", handleResize);
    document.removeEventListener("mouseup", handleMouseUp);
  };

  useEvent("beforeunload", (e) => {
    if (isAiWorking || html !== defaultHTML) {
      e.preventDefault();
      return "";
    }
  });

  useMount(() => {
    if (htmlStorage) {
      removeHtmlStorage();
      toast.warn("Previous HTML content restored from local storage.");
    }

    resetLayout();

    if (!resizer.current) return;
    resizer.current.addEventListener("mousedown", handleMouseDown);
    window.addEventListener("resize", resetLayout);
  });

  useUnmount(() => {
    document.removeEventListener("mousemove", handleResize);
    document.removeEventListener("mouseup", handleMouseUp);
    if (resizer.current) {
      resizer.current.removeEventListener("mousedown", handleMouseDown);
    }
    window.removeEventListener("resize", resetLayout);
  });

  return (
    <div className="h-screen bg-gray-950 font-sans overflow-hidden">
      {showRedirectModal && (
        <RedirectModal onDismiss={() => setShowRedirectModal(false)} />
      )}
      <Header
        onReset={() => {
          if (isAiWorking) {
            toast.warn("Please wait for the AI to finish working.");
            return;
          }
          if (
            window.confirm("You're about to reset the editor. Are you sure?")
          ) {
            setHtml(defaultHTML);
            setError(false);
            removeHtmlStorage();
          }
        }}
      >
        <DeployButton html={html} error={error} />
      </Header>
      <main className="max-lg:flex-col flex w-full">
        <div
          ref={editor}
          className="w-full h-[30dvh] lg:h-full relative"
          onClick={(e) => {
            if (isAiWorking) {
              e.preventDefault();
              e.stopPropagation();
              toast.warn("Please wait for the AI to finish working.");
            }
          }}
        >
          <Tabs />
          <Editor
            language="html"
            theme="vs-dark"
            className={classNames(
              "h-[calc(30dvh-41px)] lg:h-[calc(100dvh-96px)]",
              {
                "pointer-events-none": isAiWorking,
              }
            )}
            value={html}
            onValidate={(markers) => {
              if (markers?.length > 0) {
                setError(true);
              }
            }}
            onChange={(value) => {
              const newValue = value ?? "";
              setHtml(newValue);
              setError(false);
            }}
          />
          <AskAI
            html={html}
            setHtml={setHtml}
            isAiWorking={isAiWorking}
            setisAiWorking={setisAiWorking}
            onScrollToBottom={() => {}}
          />
        </div>
        <div
          ref={resizer}
          className="bg-gray-700 hover:bg-blue-500 w-2 cursor-col-resize h-[calc(100dvh-54px)] max-lg:hidden"
        />
        <Preview
          html={html}
          isResizing={isResizing}
          isAiWorking={isAiWorking}
          ref={preview}
        />
      </main>
    </div>
  );
}

export default App;