"use client";

import type { DragEndEvent, DragStartEvent } from "@dnd-kit/core";
import {
  closestCenter,
  DndContext,
  DragOverlay,
  KeyboardSensor,
  PointerSensor,
  useSensor,
  useSensors,
} from "@dnd-kit/core";
import {
  arrayMove,
  SortableContext,
  sortableKeyboardCoordinates,
  useSortable,
  verticalListSortingStrategy,
} from "@dnd-kit/sortable";
import { CSS } from "@dnd-kit/utilities";
import { ChevronDown, GripVertical } from "lucide-react";
import { useState } from "react";

import { Button } from "@/components/ui/button";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Item,
  ItemContent,
  ItemGroup,
  ItemMedia,
  ItemTitle,
} from "@/components/ui/item";
import { cn } from "@/lib/utils";

interface Todo {
  id: string;
  title: string;
  completed: boolean;
}

interface Todo3Props {
  heading?: string;
  description?: string;
  activeLabel?: string;
  completedLabel?: string;
  initialTodos?: Todo[];
  className?: string;
}

const defaultTodos: Todo[] = [
  {
    id: "1",
    title: "تکمیل مستندات فنی پروژه",
    completed: false,
  },
  {
    id: "2",
    title: "بررسی و تأیید طراحی رابط کاربری",
    completed: false,
  },
  {
    id: "3",
    title: "آماده‌سازی گزارش هفتگی",
    completed: false,
  },
  {
    id: "4",
    title: "بازبینی کد منابع",
    completed: true,
  },
  {
    id: "5",
    title: "هماهنگی با تیم طراحی",
    completed: false,
  },
  {
    id: "6",
    title: "به‌روزرسانی مستندات فنی",
    completed: true,
  },
];

interface SortableTodoItemProps {
  todo: Todo;
  onToggle: (id: string) => void;
  isAnimating?: boolean;
}

const SortableTodoItem = ({
  todo,
  onToggle,
  isAnimating = false,
}: SortableTodoItemProps) => {
  const {
    attributes,
    listeners,
    setNodeRef,
    transform,
    transition,
    isDragging,
  } = useSortable({ id: todo.id });

  const style = {
    transform: CSS.Translate.toString(transform),
    transition,
    opacity: isDragging ? 0.5 : 1,
  };

  return (
    <div ref={setNodeRef} style={style}>
      <Item
        variant={todo.completed || isAnimating ? "muted" : "default"}
        className={cn(
          "cursor-pointer items-center border-b transition-all duration-500",
          isAnimating && "opacity-0",
          !isAnimating && todo.completed && "opacity-60",
        )}
        onClick={() => onToggle(todo.id)}
      >
        <ItemMedia>
          <div className="flex items-center gap-2">
            <Button
              variant="ghost"
              size="icon-sm"
              {...attributes}
              {...listeners}
              className="cursor-grab active:cursor-grabbing"
              onClick={(e) => e.stopPropagation()}
              aria-label={`جابه‌جایی «${todo.title}»`}
            >
              <GripVertical className="size-4 text-muted-foreground" />
            </Button>
            <Checkbox
              checked={todo.completed || isAnimating}
              onCheckedChange={() => onToggle(todo.id)}
              onClick={(e) => e.stopPropagation()}
              aria-label={
                todo.completed
                  ? `علامت‌گذاری «${todo.title}» به‌عنوان انجام‌نشده`
                  : `علامت‌گذاری «${todo.title}» به‌عنوان انجام‌شده`
              }
            />
          </div>
        </ItemMedia>
        <ItemContent>
          <ItemTitle
            className={cn(
              "transition-all duration-500",
              (todo.completed || isAnimating) &&
                "text-muted-foreground line-through",
            )}
          >
            {todo.title}
          </ItemTitle>
        </ItemContent>
      </Item>
    </div>
  );
};

const Todo3 = ({
  heading = "مدیریت وظایف با بخش تکمیل‌شده‌ها",
  description =
    "ترتیب وظایف را با کشیدن تغییر دهید، وضعیت تکمیل را علامت بزنید و وظایف انجام‌شده را در بخش تاشو مشاهده کنید.",
  activeLabel = "در انتظار",
  completedLabel = "تکمیل‌شده",
  initialTodos = defaultTodos,
  className,
}: Todo3Props) => {
  const [todos, setTodos] = useState(initialTodos);
  const [isCompletedExpanded, setIsCompletedExpanded] = useState(true);
  const [activeTodo, setActiveTodo] = useState<Todo | null>(null);
  const [animatingTodoId, setAnimatingTodoId] = useState<string | null>(null);

  const sensors = useSensors(
    useSensor(PointerSensor),
    useSensor(KeyboardSensor, {
      coordinateGetter: sortableKeyboardCoordinates,
    }),
  );

  const toggleTodo = (id: string) => {
    const todo = todos.find((t) => t.id === id);
    if (!todo) return;

    if (!todo.completed) {
      setAnimatingTodoId(id);
      setTimeout(() => {
        setTodos((prevTodos) =>
          prevTodos.map((t) => (t.id === id ? { ...t, completed: true } : t)),
        );
        setAnimatingTodoId(null);
      }, 1000);
    } else {
      setTodos((prevTodos) =>
        prevTodos.map((t) => (t.id === id ? { ...t, completed: false } : t)),
      );
    }
  };

  const handleDragStart = (event: DragStartEvent) => {
    const { active } = event;
    const todo = todos.find((t) => t.id === active.id);
    setActiveTodo(todo || null);
  };

  const handleDragEnd = (event: DragEndEvent) => {
    const { active, over } = event;

    if (over && active.id !== over.id) {
      setTodos((items) => {
        const oldIndex = items.findIndex((item) => item.id === active.id);
        const newIndex = items.findIndex((item) => item.id === over.id);
        return arrayMove(items, oldIndex, newIndex);
      });
    }

    setActiveTodo(null);
  };

  const activeTodos = todos.filter((todo) => !todo.completed);
  const completedTodos = todos.filter((todo) => todo.completed);

  return (
    <section dir="rtl" lang="fa" className={cn("py-32", className)}>
      <div className="container">
        <div className="mx-auto flex max-w-2xl flex-col gap-8">
          <div className="flex flex-col gap-2">
            <h2 className="text-3xl font-semibold md:text-xl">{heading}</h2>
            <p className="text-muted-foreground">{description}</p>
          </div>
          <DndContext
            sensors={sensors}
            collisionDetection={closestCenter}
            onDragStart={handleDragStart}
            onDragEnd={handleDragEnd}
          >
            <div className="flex max-w-2xl flex-col gap-6">
              {activeTodos.length > 0 && (
                <div className="flex flex-col gap-2">
                  <h3 className="text-lg font-semibold">
                    {activeLabel} ({activeTodos.length})
                  </h3>
                  <SortableContext
                    items={activeTodos.map((t) => t.id)}
                    strategy={verticalListSortingStrategy}
                  >
                    <ItemGroup>
                      {activeTodos.map((todo) => (
                        <SortableTodoItem
                          key={todo.id}
                          todo={todo}
                          onToggle={toggleTodo}
                          isAnimating={animatingTodoId === todo.id}
                        />
                      ))}
                    </ItemGroup>
                  </SortableContext>
                </div>
              )}

              {completedTodos.length > 0 && (
                <div className="flex flex-col gap-3 border-t border-border/50 pt-6">
                  <button
                    type="button"
                    onClick={() => setIsCompletedExpanded(!isCompletedExpanded)}
                    className="group flex w-full items-center gap-2 text-xs font-semibold text-muted-foreground transition-colors hover:text-foreground"
                    aria-expanded={isCompletedExpanded}
                    aria-label={
                      isCompletedExpanded
                        ? `بستن بخش ${completedLabel}`
                        : `باز کردن بخش ${completedLabel}`
                    }
                  >
                    <ChevronDown
                      className={cn(
                        "size-3.5 text-muted-foreground transition-transform duration-200",
                        !isCompletedExpanded && "-rotate-90",
                      )}
                      aria-hidden
                    />
                    <span>{completedLabel}</span>
                    <span className="rounded-full bg-muted/60 px-2 py-0.5 text-[10px] font-medium text-muted-foreground">
                      {completedTodos.length}
                    </span>
                  </button>

                  <div
                    className={cn(
                      "overflow-hidden transition-all duration-300 ease-in-out",
                      isCompletedExpanded
                        ? "max-h-[2000px] opacity-100"
                        : "max-h-0 opacity-0",
                    )}
                  >
                    <ItemGroup>
                      {completedTodos.map((todo) => (
                        <Item
                          key={todo.id}
                          variant="muted"
                          className="cursor-pointer items-center border-b opacity-60 transition-all duration-500 hover:opacity-80"
                          onClick={() => toggleTodo(todo.id)}
                        >
                          <ItemMedia>
                            <Checkbox
                              checked={todo.completed}
                              onCheckedChange={() => toggleTodo(todo.id)}
                              onClick={(e) => e.stopPropagation()}
                              aria-label={`علامت‌گذاری «${todo.title}» به‌عنوان انجام‌نشده`}
                            />
                          </ItemMedia>
                          <ItemContent>
                            <ItemTitle className="text-muted-foreground line-through">
                              {todo.title}
                            </ItemTitle>
                          </ItemContent>
                        </Item>
                      ))}
                    </ItemGroup>
                  </div>
                </div>
              )}
            </div>
            <DragOverlay>
              {activeTodo ? (
                <Item
                  variant={activeTodo.completed ? "muted" : "default"}
                  className="cursor-grabbing items-center border-b opacity-90 shadow-lg"
                >
                  <ItemMedia>
                    <div className="flex items-center gap-2">
                      <Button
                        variant="ghost"
                        size="icon-sm"
                        className="cursor-grabbing"
                        aria-hidden
                        tabIndex={-1}
                      >
                        <GripVertical className="size-4 text-muted-foreground" />
                      </Button>
                      <Checkbox
                        checked={activeTodo.completed}
                        aria-hidden
                        tabIndex={-1}
                      />
                    </div>
                  </ItemMedia>
                  <ItemContent>
                    <ItemTitle
                      className={
                        activeTodo.completed
                          ? "text-muted-foreground line-through"
                          : ""
                      }
                    >
                      {activeTodo.title}
                    </ItemTitle>
                  </ItemContent>
                </Item>
              ) : null}
            </DragOverlay>
          </DndContext>
        </div>
      </div>
    </section>
  );
};

export { Todo3 };