import React, { useState, useRef, useEffect, SetStateAction } from "react";

// @ts-ignore
import FolderIcon from "@/assets/fontawesome/svg/folder.svg?react";
import { DraggableNote } from "./subcomponents/DraggableNote";

import {
  DndContext,
  DragEndEvent,
  DragOverlay,
  DragStartEvent,
  PointerSensor,
  useSensor,
  useSensors,
} from "@dnd-kit/core";

import { FolderTree } from "./subcomponents/FolderTree.tsx";
import { SidebarHeader } from "./subcomponents/SideBarHeader.tsx";
import { useAuthStore } from "@/stores/authStore.ts";
import { useNoteStore } from "@/stores/notesStore.ts";
import { useUIStore } from "@/stores/uiStore.ts";

export const Sidebar = () => {
  const [newFolder, setNewFolder] = useState(false);
  const [newFolderText, setNewFolderText] = useState("");
  const [activeItem, setActiveItem] = useState<{
    type: "note" | "folder";
    data: any;
  } | null>(null);
  const newFolderRef = useRef<HTMLInputElement>(null);

  const {
    folderTree,
    loadFolderTree,
    moveNoteToFolder,
    moveFolderToFolder,
    createFolder,
  } = useNoteStore();

  const { encryptionKey } = useAuthStore();

  const { setSideBarResize, sideBarResize } = useUIStore();
  useEffect(() => {
    if (newFolder && newFolderRef.current) {
      newFolderRef.current.focus();
    }
  }, [newFolder]);

  useEffect(() => {
    if (!encryptionKey) return;
    loadFolderTree();
  }, [encryptionKey]);

  const handleCreateFolder = async () => {
    if (!newFolderText.trim()) return;
    await createFolder({
      name: newFolderText,
      parent_id: null,
    });
    setNewFolderText("");
    setNewFolder(false);
  };

  const pointer = useSensor(PointerSensor, {
    activationConstraint: {
      distance: 30,
    },
  });
  const sensors = useSensors(pointer);

  const handleDragStart = (event: DragStartEvent) => {
    const { active } = event;
    if (active.data.current?.type === "note") {
      setActiveItem({ type: "note", data: active.data.current.note });
    } else if (active.data.current?.type === "folder") {
      setActiveItem({ type: "folder", data: active.data.current.folder });
    }
  };

  const handleDragEnd = async (event: DragEndEvent) => {
    setActiveItem(null);
    const { active, over } = event;
    if (!over) return;

    console.log("Drag ended:", {
      activeId: active.id,
      activeType: active.data.current?.type,
      activeFolder: active.data.current?.folder,
      overId: over.id,
      overType: over.data.current?.type,
    });

    if (active.data.current?.type === "note") {
      console.log("Updating note", active.id, "to folder", over.id);
      await moveNoteToFolder(active.id as number, over.id as number);
    } else if (active.data.current?.type === "folder") {
      // Prevent dropping folder into itself
      if (active.data.current.folder.id === over.id) {
        console.log("Cannot drop folder into itself");
        return;
      }

      console.log(
        "Updating folder",
        active.data.current.folder.id,
        "parent to",
        over.id,
      );
      try {
        await moveFolderToFolder(
          active.data.current.folder.id,
          over.id as number,
        );
      } catch (error) {
        console.error("Failed to update folder:", error);
        return;
      }
    }
  };

  const [isResizing, setIsResizing] = useState(false);

  const handleMouseDown = (e: React.MouseEvent) => {
    setIsResizing(true);
    e.preventDefault();
  };

  useEffect(() => {
    const handleMouseMove = (e: MouseEvent) => {
      if (!isResizing) return;

      // Calculate new width based on mouse position from the left edge
      const newWidth = e.clientX;

      if (newWidth >= 200 && newWidth <= 500) {
        setSideBarResize(newWidth);
      }
    };

    const handleMouseUp = () => {
      setIsResizing(false);
    };

    if (isResizing) {
      document.addEventListener("mousemove", handleMouseMove);
      document.addEventListener("mouseup", handleMouseUp);
    }

    return () => {
      document.removeEventListener("mousemove", handleMouseMove);
      document.removeEventListener("mouseup", handleMouseUp);
    };
  }, [isResizing]);

  return (
    <DndContext
      onDragStart={handleDragStart}
      onDragEnd={handleDragEnd}
      autoScroll={false}
      sensors={sensors}
    >
      <div className="flex-row-reverse flex">
        <div
          className="h-screen bg-ctp-surface0 w-0.5 hover:cursor-ew-resize hover:bg-ctp-mauve transition-colors"
          onMouseDown={handleMouseDown}
        ></div>
        <div
          className="flex flex-col min-h-full"
          style={{ width: `${sideBarResize}px` }}
        >
          <SidebarHeader setNewFolder={setNewFolder} />
          <div
            className="bg-ctp-mantle min-h-full border-r border-ctp-surface2 w-full p-4 overflow-y-auto sm:block hidden flex-col gap-3"
            onDragOver={(e) => e.preventDefault()}
            onTouchMove={(e) => e.preventDefault()}
          >
            {/* New folder input */}
            {newFolder && (
              <div className="mb-2">
                <input
                  onBlur={() => setNewFolder(false)}
                  onChange={(e) => setNewFolderText(e.target.value)}
                  value={newFolderText}
                  type="text"
                  placeholder="Folder name..."
                  className="standard-input"
                  ref={newFolderRef}
                  onKeyDown={(e) => {
                    if (e.key === "Enter") {
                      handleCreateFolder();
                    }
                    if (e.key === "Escape") {
                      setNewFolder(false);
                    }
                  }}
                />
              </div>
            )}

            {/* Folder tree */}
            <div className="flex flex-col gap-1">
              {folderTree?.folders.map((folder) => (
                <FolderTree key={folder.id} folder={folder} depth={0} />
              ))}
            </div>

            {/* Orphaned notes */}
            {folderTree?.orphaned_notes &&
              folderTree.orphaned_notes.length > 0 && (
                <div className="mt-4 flex flex-col gap-1">
                  {folderTree.orphaned_notes.map((note) => (
                    <DraggableNote key={note.id} note={note} />
                  ))}
                </div>
              )}
          </div>

          <DragOverlay>
            {activeItem?.type === "note" && (
              <div className="bg-ctp-surface0 rounded-md px-2 py-1 shadow-lg border border-ctp-mauve">
                {activeItem.data.title}
              </div>
            )}
            {activeItem?.type === "folder" && (
              <div className="bg-ctp-surface0 rounded-md px-1 py-0.5 shadow-lg flex items-center gap-1 text-sm">
                <FolderIcon className="w-3 h-3 fill-ctp-mauve mr-1" />
                {activeItem.data.name}
              </div>
            )}
          </DragOverlay>
        </div>
      </div>
    </DndContext>
  );
};