"use client";

import { useState } from "react";
import { useAuth } from "@/hooks/use-auth";
import { FolderKanban, Loader2, Eye, EyeOff } from "lucide-react";

import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Alert, AlertDescription } from "@/components/ui/alert";

export default function LoginPage() {
  const { login, isLoading: authLoading } = useAuth();
  const [formData, setFormData] = useState({
    login: "",
    password: "",
  });
  const [showPassword, setShowPassword] = useState(false);
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const { name, value } = e.target;
    setFormData((prev) => ({ ...prev, [name]: value }));
    // Limpiar error al escribir
    if (error) setError(null);
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError(null);
    setIsSubmitting(true);

    // Validación básica
    if (!formData.login.trim()) {
      setError("El usuario es requerido");
      setIsSubmitting(false);
      return;
    }

    if (!formData.password) {
      setError("La contraseña es requerida");
      setIsSubmitting(false);
      return;
    }

    try {
      const result = await login({
        login: formData.login.trim(),
        password: formData.password,
      });

      if (!result.success) {
        setError(result.error || "Error al iniciar sesión");
      }
      // Si success, el AuthProvider redirigirá automáticamente
    } catch {
      setError("Error inesperado. Por favor, intenta de nuevo.");
    } finally {
      setIsSubmitting(false);
    }
  };

  const isLoading = isSubmitting || authLoading;

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-slate-50 to-slate-100 dark:from-slate-950 dark:to-slate-900 p-4">
      <Card className="w-full max-w-md shadow-xl border-0 bg-card/80 backdrop-blur">
        {/* Header */}
        <CardHeader className="space-y-4 text-center pb-2">
          <div className="mx-auto flex h-14 w-14 items-center justify-center rounded-xl bg-gradient-to-br from-blue-500 to-purple-600 shadow-lg">
            <FolderKanban className="h-7 w-7 text-white" />
          </div>
          <div className="space-y-1">
            <CardTitle className="text-2xl font-bold tracking-tight">
              Dolibarr Proyectos
            </CardTitle>
            <CardDescription className="text-muted-foreground">
              Inicia sesión para acceder al panel de gestión
            </CardDescription>
          </div>
        </CardHeader>

        {/* Form */}
        <form onSubmit={handleSubmit}>
          <CardContent className="space-y-4 pt-4">
            {/* Error Alert */}
            {error && (
              <Alert variant="destructive" className="animate-in fade-in-50">
                <AlertDescription>{error}</AlertDescription>
              </Alert>
            )}

            {/* Usuario */}
            <div className="space-y-2">
              <Label htmlFor="login">Usuario</Label>
              <Input
                id="login"
                name="login"
                type="text"
                placeholder="Tu nombre de usuario"
                value={formData.login}
                onChange={handleChange}
                disabled={isLoading}
                autoComplete="username"
                autoFocus
                className="h-11"
              />
            </div>

            {/* Contraseña */}
            <div className="space-y-2">
              <Label htmlFor="password">Contraseña</Label>
              <div className="relative">
                <Input
                  id="password"
                  name="password"
                  type={showPassword ? "text" : "password"}
                  placeholder="Tu contraseña"
                  value={formData.password}
                  onChange={handleChange}
                  disabled={isLoading}
                  autoComplete="current-password"
                  className="h-11 pr-10"
                />
                <Button
                  type="button"
                  variant="ghost"
                  size="icon"
                  className="absolute right-0 top-0 h-11 w-11 hover:bg-transparent"
                  onClick={() => setShowPassword(!showPassword)}
                  disabled={isLoading}
                  tabIndex={-1}
                >
                  {showPassword ? (
                    <EyeOff className="h-4 w-4 text-muted-foreground" />
                  ) : (
                    <Eye className="h-4 w-4 text-muted-foreground" />
                  )}
                </Button>
              </div>
            </div>
          </CardContent>

          <CardFooter className="flex flex-col gap-4 pt-2">
            <Button
              type="submit"
              className="w-full h-11 bg-gradient-to-r from-blue-500 to-purple-600 hover:from-blue-600 hover:to-purple-700 text-white font-medium"
              disabled={isLoading}
            >
              {isLoading ? (
                <>
                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                  Iniciando sesión...
                </>
              ) : (
                "Iniciar sesión"
              )}
            </Button>

            <p className="text-xs text-center text-muted-foreground">
              Usa tus credenciales de Dolibarr para acceder
            </p>
          </CardFooter>
        </form>
      </Card>
    </div>
  );
}