"use client";

import { useState, useEffect } from "react";
import { motion, AnimatePresence } from "framer-motion";
import { Progress } from "@/components/ui/progress";
import { Toggle } from "@/components/ui/toggle";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Card, CardContent } from "@/components/ui/card";
import { Checkbox } from "@/components/ui/checkbox";
import { Plus, Eye, EyeOff, Trash2 } from "lucide-react";

interface Todo {
  id: number;
  text: string;
  completed: boolean;
}

export default function ColorfulTodoList() {
  const [todos, setTodos] = useState<Todo[]>([]);
  const [newTodo, setNewTodo] = useState("");
  const [showCompleted, setShowCompleted] = useState(true);

  // Fetch tasks from API
  useEffect(() => {
    fetch("/api/tasks")
      .then((res) => res.json())
      .then(setTodos)
      .catch(() => console.error("Failed to load tasks"));
  }, []);

  // Save tasks to API
  const saveTasks = (updatedTodos: Todo[]) => {
    setTodos(updatedTodos);
    fetch("/api/tasks", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(updatedTodos),
    }).catch(() => console.error("Failed to save tasks"));
  };

  const addTodo = (e: React.FormEvent) => {
    e.preventDefault();
    if (newTodo.trim()) {
      saveTasks([{ id: Date.now(), text: newTodo, completed: false }, ...todos]);
      setNewTodo("");
    }
  };

  const toggleTodo = (id: number) => {
    saveTasks(
      todos.map((todo) => (todo.id === id ? { ...todo, completed: !todo.completed } : todo))
    );
  };

  const deleteTodo = (id: number) => {
    saveTasks(todos.filter((todo) => todo.id !== id));
  };

  const completedCount = todos.filter((todo) => todo.completed).length;
  const progress = todos.length > 0 ? (completedCount / todos.length) * 100 : 0;

  return (
    <div className="min-h-screen p-8 bg-gradient-to-b from-black to-[#222] flex items-center justify-center">
      <Card className="w-full max-w-md bg-slate-800 shadow-lg border-0">
        <CardContent className="p-6">
          <div className="space-y-6">
            {/* Header with Progress */}
            <div className="space-y-2">
              <div className="flex justify-between items-center">
                <h1 className="text-2xl font-bold text-slate-100">Tasks</h1>
                <Toggle
                  pressed={showCompleted}
                  onPressedChange={setShowCompleted}
                  className="bg-slate-700 data-[state=on]:bg-slate-600 hover:bg-slate-600"
                >
                  {showCompleted ? <Eye className="h-4 w-4 text-slate-200" /> : <EyeOff className="h-4 w-4 text-slate-200" />}
                </Toggle>
              </div>
              <Progress value={progress} className="h-2 [&>div]:bg-green-700 bg-slate-200/20" />
              <p className="text-sm text-slate-300">{completedCount} of {todos.length} tasks completed</p>
            </div>

            {/* Add Todo Form */}
            <form onSubmit={addTodo} className="flex gap-2">
              <Input
                type="text"
                value={newTodo}
                onChange={(e) => setNewTodo(e.target.value)}
                placeholder="Add a new task..."
                className="flex-1 bg-slate-700 text-slate-100 placeholder-slate-400 border-slate-600 focus:border-sky-400 focus:ring-sky-400"
              />
              <Button type="submit" size="icon" className="bg-sky-500 hover:bg-sky-600 text-white">
                <Plus className="h-4 w-4" />
              </Button>
            </form>

            {/* Todo List */}
            <motion.div layout className="space-y-2">
              <AnimatePresence initial={false}>
                {todos
                  .filter((todo) => showCompleted || !todo.completed)
                  .map((todo) => (
                    <motion.div key={todo.id} layout>
                      <div className="group flex items-center gap-3 p-3 rounded-lg bg-slate-700/30 hover:bg-slate-700/50">
                        <Checkbox checked={todo.completed} onCheckedChange={() => toggleTodo(todo.id)} />
                        <span className="flex-1 text-slate-100">{todo.text}</span>
                        {todo.completed && (
                          <Button size="icon" variant="ghost" onClick={() => deleteTodo(todo.id)}>
                            <Trash2 className="h-4 w-4" />
                          </Button>
                        )}
                      </div>
                    </motion.div>
                  ))}
              </AnimatePresence>
            </motion.div>
          </div>
        </CardContent>
      </Card>
    </div>
  );
}