"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import Image from "next/image";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Checkbox } from "@/components/ui/checkbox";
import { Eye, EyeOff, Loader2 } from "lucide-react";
import { toast } from "sonner";

export default function LoginPage() {
  const router = useRouter();
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [showPassword, setShowPassword] = useState(false);
  const [rememberMe, setRememberMe] = useState(false);
  const [loading, setLoading] = useState(false);

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    if (!email || !password) {
      toast.error("Please enter email and password");
      return;
    }

    setLoading(true);
    try {
      const res = await fetch("/api/auth/login", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        credentials: "include",
        body: JSON.stringify({ email, password }),
      });

      const data = await res.json();

      if (!res.ok) {
        toast.error(data.error || "Login failed");
        return;
      }

      toast.success("Login successful");
      window.location.href = "/";
    } catch {
      toast.error("An error occurred");
    } finally {
      setLoading(false);
    }
  }

  return (
    <div 
      className="min-h-screen flex flex-col items-center justify-center px-4"
      style={{ 
        background: "radial-gradient(circle at center, #0c1c28 0%, #05131d 100%)"
      }}
    >
      {/* LINSE Title */}
      <h1 
        className="text-4xl md:text-[38px] font-light mb-10"
        style={{ color: "#7cecff", letterSpacing: "12px", opacity: 0.9 }}
      >
        LINSE
      </h1>

      {/* Circuit Logo */}
      <div className="mb-10">
        <Image
          src="/images/linse-symbol.png"
          alt="Linse Symbol"
          width={160}
          height={160}
          className="w-40 h-40"
          style={{
            filter: "drop-shadow(0 0 25px #18d1e4) brightness(0) saturate(100%) invert(73%) sepia(67%) saturate(1000%) hue-rotate(130deg) brightness(95%)"
          }}
          priority
        />
      </div>

      {/* Login Form Card */}
      <div 
        className="w-full max-w-[360px] rounded-[14px] p-9 text-left"
        style={{ 
          background: "rgba(255, 255, 255, 0.04)",
          border: "1px solid rgba(255, 255, 255, 0.06)",
          backdropFilter: "blur(10px)",
          boxShadow: "0 0 30px rgba(0, 0, 0, 0.3)"
        }}
      >
        <form onSubmit={handleSubmit} className="space-y-[18px]">
          {/* Email Input */}
          <Input
            type="email"
            placeholder="Email or username"
            value={email}
            onChange={(e) => setEmail(e.target.value)}
            className="h-[50px] rounded-lg text-[15px]"
            style={{
              background: "rgba(255, 255, 255, 0.05)",
              border: "1px solid rgba(255, 255, 255, 0.12)",
              color: "#d8e8f0"
            }}
            autoComplete="email"
            disabled={loading}
          />

          {/* Password Input */}
          <div className="relative">
            <Input
              type={showPassword ? "text" : "password"}
              placeholder="Password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              className="h-[50px] rounded-lg text-[15px] pr-10"
              style={{
                background: "rgba(255, 255, 255, 0.05)",
                border: "1px solid rgba(255, 255, 255, 0.12)",
                color: "#d8e8f0"
              }}
              autoComplete="current-password"
              disabled={loading}
            />
            <button
              type="button"
              onClick={() => setShowPassword(!showPassword)}
              className="absolute right-3 top-1/2 -translate-y-1/2 transition-colors"
              style={{ color: "#9db4c1" }}
              tabIndex={-1}
            >
              {showPassword ? (
                <EyeOff className="h-5 w-5" />
              ) : (
                <Eye className="h-5 w-5" />
              )}
            </button>
          </div>

          {/* Remember me & Forgot password */}
          <div className="flex items-center justify-between mb-[25px] text-[14px]">
            <div className="flex items-center gap-[6px]">
              <Checkbox 
                id="remember" 
                checked={rememberMe}
                onCheckedChange={(checked) => setRememberMe(checked as boolean)}
                className="border-[#9db4c1] data-[state=checked]:bg-cyan-600 data-[state=checked]:border-cyan-600"
              />
              <label 
                htmlFor="remember" 
                className="cursor-pointer select-none"
                style={{ color: "#d8e8f0" }}
              >
                Remember me
              </label>
            </div>
            <button
              type="button"
              className="hover:underline transition-colors"
              style={{ color: "#8fd8e8" }}
              onClick={() => toast.info("Contact your administrator to reset your password")}
            >
              Forgot password?
            </button>
          </div>

          {/* Login Button */}
          <Button
            type="submit"
            className="w-full h-[50px] text-base font-semibold rounded-lg transition-all hover:scale-[1.02]"
            style={{ 
              background: "linear-gradient(90deg, #1cb5c9, #0fa4b7)",
              color: "#ffffff",
            }}
            disabled={loading}
          >
            {loading ? (
              <>
                <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                Logging in...
              </>
            ) : (
              "Log in"
            )}
          </Button>
        </form>
      </div>
    </div>
  );
}