'use client';

import { useState } from 'react';
import { Task, WorkItemStatus } from '@/types/project';
import { useChangeTaskStatus, useUpdateTask, useDeleteTask } from '@/lib/hooks/use-tasks';
import { Card, CardContent, CardHeader } from '@/components/ui/card';
import { Checkbox } from '@/components/ui/checkbox';
import { Badge } from '@/components/ui/badge';
import { Button } from '@/components/ui/button';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import {
  MoreHorizontal,
  Pencil,
  Trash2,
  Clock,
  User,
  CheckCircle2,
  Circle
} from 'lucide-react';
import { cn } from '@/lib/utils';

interface TaskCardProps {
  task: Task;
  storyId: string;
}

const priorityColors = {
  Critical: 'bg-red-500 text-white',
  High: 'bg-orange-500 text-white',
  Medium: 'bg-yellow-500 text-white',
  Low: 'bg-blue-500 text-white',
};

const statusColors = {
  Todo: 'text-gray-500',
  InProgress: 'text-blue-500',
  Done: 'text-green-500',
  Blocked: 'text-red-500',
};

export function TaskCard({ task, storyId }: TaskCardProps) {
  const [isExpanded, setIsExpanded] = useState(false);
  const changeStatus = useChangeTaskStatus();
  const updateTask = useUpdateTask();
  const deleteTask = useDeleteTask();

  const isDone = task.status === 'Done';

  const handleCheckboxChange = (checked: boolean) => {
    const newStatus: WorkItemStatus = checked ? 'Done' : 'Todo';
    changeStatus.mutate({ id: task.id, status: newStatus });
  };

  const handleDelete = () => {
    if (confirm('Are you sure you want to delete this task?')) {
      deleteTask.mutate(task.id);
    }
  };

  return (
    <Card
      className={cn(
        "transition-all duration-200 hover:shadow-md cursor-pointer",
        isDone && "opacity-60"
      )}
      onClick={() => setIsExpanded(!isExpanded)}
    >
      <CardHeader className="p-4">
        <div className="flex items-start gap-3">
          {/* Checkbox */}
          <div onClick={(e) => e.stopPropagation()}>
            <Checkbox
              checked={isDone}
              onCheckedChange={handleCheckboxChange}
              disabled={changeStatus.isPending}
              className="mt-1"
            />
          </div>

          {/* Task Content */}
          <div className="flex-1 min-w-0">
            <div className="flex items-center gap-2 mb-2">
              <h4 className={cn(
                "font-medium text-sm",
                isDone && "line-through text-muted-foreground"
              )}>
                {task.title}
              </h4>
              <Badge
                variant="secondary"
                className={cn("text-xs", priorityColors[task.priority])}
              >
                {task.priority}
              </Badge>
            </div>

            {/* Metadata */}
            <div className="flex items-center gap-4 text-xs text-muted-foreground">
              {task.estimatedHours && (
                <div className="flex items-center gap-1">
                  <Clock className="w-3 h-3" />
                  <span>{task.estimatedHours}h</span>
                </div>
              )}
              {task.assigneeId && (
                <div className="flex items-center gap-1">
                  <User className="w-3 h-3" />
                  <span>Assigned</span>
                </div>
              )}
              <div className={cn("flex items-center gap-1", statusColors[task.status])}>
                {isDone ? (
                  <CheckCircle2 className="w-3 h-3" />
                ) : (
                  <Circle className="w-3 h-3" />
                )}
                <span>{task.status}</span>
              </div>
            </div>

            {/* Description (expanded) */}
            {isExpanded && task.description && (
              <div className="mt-3 text-sm text-muted-foreground">
                {task.description}
              </div>
            )}
          </div>

          {/* Actions Menu */}
          <div onClick={(e) => e.stopPropagation()}>
            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <Button
                  variant="ghost"
                  size="sm"
                  className="h-8 w-8 p-0"
                >
                  <MoreHorizontal className="w-4 h-4" />
                </Button>
              </DropdownMenuTrigger>
              <DropdownMenuContent align="end">
                <DropdownMenuItem onClick={() => {/* TODO: Open edit dialog */}}>
                  <Pencil className="w-4 h-4 mr-2" />
                  Edit
                </DropdownMenuItem>
                <DropdownMenuItem
                  onClick={handleDelete}
                  className="text-destructive"
                >
                  <Trash2 className="w-4 h-4 mr-2" />
                  Delete
                </DropdownMenuItem>
              </DropdownMenuContent>
            </DropdownMenu>
          </div>
        </div>
      </CardHeader>
    </Card>
  );
}