"use client";

import { useState, useEffect } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Heart, Eye, EyeOff, X, Loader2 } from "lucide-react";
import Link from "next/link";
import Image from "next/image";
import { useRouter, useSearchParams } from "next/navigation";
import { useAppTheme } from "@/components/ThemeProvider";
import { useAuth } from "@/hooks/useAuth";
import { loginSchema, type LoginInput } from "@/lib/schema/auth";
import { toast } from "sonner";

export default function Login() {
  const { theme } = useAppTheme();
  const isDark = theme === "dark";
  const [showPassword, setShowPassword] = useState(false);
  const [rememberMe, setRememberMe] = useState(false);
  const [formData, setFormData] = useState<LoginInput>({
    email: "",
    password: "",
  });
  const [errors, setErrors] = useState<Partial<Record<keyof LoginInput, string>>>({});
  const router = useRouter();
  const searchParams = useSearchParams();
  const { login, isAuthenticated, loginMutation } = useAuth();

  // Redirect if already authenticated
  useEffect(() => {
    if (isAuthenticated) {
      const redirect = searchParams.get("redirect") || "/admin/dashboard";
      router.push(redirect);
    }
  }, [isAuthenticated, router, searchParams]);

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setErrors({});

    // Validate form
    const validation = loginSchema.safeParse(formData);
    if (!validation.success) {
      const fieldErrors: Partial<Record<keyof LoginInput, string>> = {};
      validation.error.issues.forEach((err) => {
        if (err.path[0]) {
          fieldErrors[err.path[0] as keyof LoginInput] = err.message;
        }
      });
      setErrors(fieldErrors);
      return;
    }

    try {
      const result = await login(formData);
      
      if (result.tokens && result.user) {
        toast.success("Login successful!");
        
        // Normalize user data
        const user = result.user;
        // Check for admin status - check multiple possible field names
        const isAdmin = 
          user.is_admin === true || 
          (user as any)?.isAdmin === true ||
          (user as any)?.is_staff === true ||
          (user as any)?.isStaff === true;
        
        // Redirect based on user role
        const redirect = searchParams.get("redirect");
        if (redirect) {
          router.push(redirect);
        } else {
          // Default to admin dashboard
          router.push("/admin/dashboard");
        }
      }
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : "Login failed. Please try again.";
      toast.error(errorMessage);
      // Don't set field errors for server errors, only show toast
      setErrors({});
    }
  };

  const handleChange = (field: keyof LoginInput, value: string) => {
    setFormData((prev) => ({ ...prev, [field]: value }));
    // Clear error when user starts typing
    if (errors[field]) {
      setErrors((prev) => ({ ...prev, [field]: undefined }));
    }
  };

    return (
    <div className="min-h-screen relative flex items-center justify-center px-4 py-12">
      {/* Background Image */}
      <div className="absolute inset-0 z-0">
        <Image
          src="/woman.jpg"
          alt="Therapy and counseling session with African American clients"
          fill
          className="object-cover object-center"
          priority
          sizes="100vw"
        />
        {/* Overlay for better readability */}
        <div className="absolute inset-0 bg-black/20"></div>
      </div>

      {/* Branding - Top Left */}
      <div className="absolute top-8 left-8 flex items-center gap-3 z-30">
        <Heart className="w-6 h-6 text-white" fill="white" />
        <span className="text-white text-xl font-semibold">Attune Heart Therapy</span>
      </div>



      {/* Centered White Card - Login Form */}
      <div className={`relative z-20 w-full max-w-md rounded-2xl shadow-2xl p-8 ${isDark ? 'bg-gray-800 border border-gray-700' : 'bg-white'}`}>
        {/* Header with Close Button */}
        <div className="flex items-start justify-between mb-2">
          <div className="flex-1">
            {/* Heading */}
            <h1 className="text-3xl font-bold bg-gradient-to-r from-rose-600 via-pink-600 to-rose-600 bg-clip-text text-transparent mb-2">
              Welcome back
            </h1>
            {/* Sign Up Prompt */}
            <p className={`mb-6 ${isDark ? 'text-gray-400' : 'text-gray-600'}`}>
              New to Attune Heart Therapy?{" "}
              <Link href="/signup" className={`underline font-medium ${isDark ? 'text-blue-400 hover:text-blue-300' : 'text-blue-600 hover:text-blue-700'}`}>
                Sign up
              </Link>
            </p>
          </div>
          {/* Close Button */}
          <Button
            onClick={() => router.back()}
            variant="ghost"
            size="icon"
            className={`flex-shrink-0 w-8 h-8 rounded-full ${isDark ? 'text-gray-400 hover:text-gray-300 hover:bg-gray-700' : 'text-gray-500 hover:text-gray-700 hover:bg-gray-100'}`}
            aria-label="Close"
          >
            <X className="w-5 h-5" />
          </Button>
        </div>

        {/* Login Form */}
        <form className="space-y-6" onSubmit={handleSubmit}>
          {/* Email Field */}
          <div className="space-y-2">
            <label htmlFor="email" className={`text-sm font-medium ${isDark ? 'text-gray-300' : 'text-black'}`}>
              Email address
            </label>
            <Input
              id="email"
              type="email"
              placeholder="Email address"
              value={formData.email}
              onChange={(e) => handleChange("email", e.target.value)}
              className={`h-12 ${isDark ? 'bg-gray-700 border-gray-600 text-white placeholder:text-gray-400' : 'bg-white border-gray-300 text-gray-900'} ${errors.email ? 'border-red-500' : ''}`}
              required
            />
          </div>

          {/* Password Field */}
          <div className="space-y-2">
            <label htmlFor="password" className={`text-sm font-medium ${isDark ? 'text-gray-300' : 'text-black'}`}>
              Your password
            </label>
            <div className="relative">
              <Input
                id="password"
                type={showPassword ? "text" : "password"}
                placeholder="Your password"
                value={formData.password}
                onChange={(e) => handleChange("password", e.target.value)}
                className={`h-12 pr-12 ${isDark ? 'bg-gray-700 border-gray-600 text-white placeholder:text-gray-400' : 'bg-white border-gray-300 text-gray-900'} ${errors.password ? 'border-red-500' : ''}`}
                required
              />
              <Button
                type="button"
                variant="ghost"
                size="icon"
                onClick={() => setShowPassword(!showPassword)}
                className={`absolute right-4 top-1/2 -translate-y-1/2 h-auto w-auto p-0 ${isDark ? 'text-gray-400 hover:text-gray-300' : 'text-gray-500 hover:text-gray-700'}`}
                aria-label={showPassword ? "Hide password" : "Show password"}
              >
                {showPassword ? (
                  <EyeOff className="w-5 h-5" />
                ) : (
                  <Eye className="w-5 h-5" />
                )}
              </Button>
            </div>
            {errors.password && (
              <p className="text-sm text-red-500">{errors.password}</p>
            )}
          </div>

          {/* Submit Button */}
          <Button
            type="submit"
            disabled={loginMutation.isPending}
            className="w-full h-12 text-base font-semibold bg-gradient-to-r from-rose-500 to-pink-600 hover:from-rose-600 hover:to-pink-700 text-white shadow-lg hover:shadow-xl transition-all disabled:opacity-50 disabled:cursor-not-allowed"
          >
            {loginMutation.isPending ? (
              <>
                <Loader2 className="w-4 h-4 mr-2 animate-spin" />
                Logging in...
              </>
            ) : (
              "Log in"
            )}
          </Button>

          {/* Remember Me & Forgot Password */}
          <div className="flex items-center justify-between text-sm">
            <label className="flex items-center gap-2 cursor-pointer">
              <input
                type="checkbox"
                checked={rememberMe}
                onChange={(e) => setRememberMe(e.target.checked)}
                className={`w-4 h-4 rounded text-rose-600 focus:ring-2 focus:ring-rose-500 cursor-pointer ${isDark ? 'border-gray-600 bg-gray-700' : 'border-gray-300'}`}
              />
              <span className={isDark ? 'text-gray-300' : 'text-black'}>Remember me</span>
            </label>
            <Link
              href="/forgot-password"
              className={`font-medium ${isDark ? 'text-blue-400 hover:text-blue-300' : 'text-blue-600 hover:text-blue-700'}`}
            >
              Forgot password?
            </Link>
          </div>

        </form>
      </div>
    </div>
  );
}