'use client';

import { useState } from 'react';
import { useRouter } from 'next/navigation';
import Link from 'next/link';
import { useCreateTask } from '@/hooks/useTasks';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';

export default function NewTaskPage() {
  const router = useRouter();
  const { mutate: createTask, isPending, error } = useCreateTask();
  
  const [formData, setFormData] = useState({
    title: '',
    description: '',
    assigneeId: '',
    dueDate: '',
  });

  const handleChange = (e: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>) => {
    setFormData((prev) => ({ ...prev, [e.target.name]: e.target.value }));
  };

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    createTask(
      {
        title: formData.title,
        description: formData.description || undefined,
        assigneeId: formData.assigneeId || undefined,
        dueDate: formData.dueDate ? new Date(formData.dueDate).toISOString() : undefined,
      },
      {
        onSuccess: (data) => {
          router.push(`/tasks/${data.id}`);
        },
      }
    );
  };

  return (
    <div className="flex-1 space-y-4 p-8 pt-6">
      <div className="flex items-center justify-between">
        <div className="space-y-1">
          <Button variant="ghost" size="sm" asChild className="mb-2 -ml-3">
            <Link href="/tasks">← Back to Tasks</Link>
          </Button>
          <h2 className="text-3xl font-bold tracking-tight">Create New Task</h2>
        </div>
      </div>

      <Card className="max-w-2xl">
        <CardHeader>
          <CardTitle>Task Details</CardTitle>
          <CardDescription>Fill in the details for the new task.</CardDescription>
        </CardHeader>
        <CardContent>
          <form onSubmit={handleSubmit} className="space-y-4">
            <div className="space-y-2">
              <Label htmlFor="title">Title <span className="text-red-500">*</span></Label>
              <Input
                id="title"
                name="title"
                required
                value={formData.title}
                onChange={handleChange}
                placeholder="e.g. Repair tennis net"
              />
            </div>

            <div className="space-y-2">
              <Label htmlFor="description">Description</Label>
              <textarea
                id="description"
                name="description"
                className="flex min-h-[80px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50"
                value={formData.description}
                onChange={handleChange}
                placeholder="Provide additional details..."
              />
            </div>

            <div className="grid grid-cols-2 gap-4">
              <div className="space-y-2">
                <Label htmlFor="assigneeId">Assignee ID</Label>
                <Input
                  id="assigneeId"
                  name="assigneeId"
                  value={formData.assigneeId}
                  onChange={handleChange}
                  placeholder="Optional"
                />
              </div>

              <div className="space-y-2">
                <Label htmlFor="dueDate">Due Date</Label>
                <Input
                  id="dueDate"
                  name="dueDate"
                  type="date"
                  value={formData.dueDate}
                  onChange={handleChange}
                />
              </div>
            </div>

            {error && (
              <div className="text-sm text-red-500 mt-2">
                Error creating task: {error instanceof Error ? error.message : 'Unknown error'}
              </div>
            )}

            <div className="flex justify-end pt-4">
              <Button type="button" variant="outline" className="mr-2" asChild>
                <Link href="/tasks">Cancel</Link>
              </Button>
              <Button type="submit" disabled={isPending || !formData.title.trim()}>
                {isPending ? 'Creating...' : 'Create Task'}
              </Button>
            </div>
          </form>
        </CardContent>
      </Card>
    </div>
  );
}
