"use client";

import React, { useState } from "react";
import { useAuth } from "@/hooks/useAuth";
import { useSearchParams } from "next/navigation";
import Link from "next/link";

export function LoginForm() {
  const { login } = useAuth();
  const searchParams = useSearchParams();
  const raw = searchParams.get("redirect") || "";
  const hasExplicitRedirect = raw.startsWith("/") && !raw.startsWith("//");
  const redirectTo = hasExplicitRedirect ? raw : "/dashboard";
  const registerHref = redirectTo !== "/dashboard" ? `/register?redirect=${encodeURIComponent(redirectTo)}` : "/register";

  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [showPassword, setShowPassword] = useState(false);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const getErrorMessage = (err: any) => {
    if (!err) return "Login failed";

    // If it's already a normal Error
    if (err.message && typeof err.message === "string") {
      // Handle case where message is accidentally JSON string
      try {
        const parsed = JSON.parse(err.message);
        return parsed.message || err.message;
      } catch {
        return err.message;
      }
    }

    // If API response object was thrown directly
    if (err.message) return err.message;

    return "Login failed";
  };

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

    try {
      const loggedInUser = await login(email, password);
      // Skip the generic /dashboard hop (which just redirects again once the role is known)
      // and go straight to the role-specific dashboard, unless the caller asked for a specific
      // page back (e.g. returning to a registration flow after login).
      const target = hasExplicitRedirect ? redirectTo : `/dashboard/${loggedInUser.role || "user"}`;
      window.location.href = target;
    } catch (err: any) {
      setError(getErrorMessage(err) || "Login failed. Please try again.");
    } finally {
      setLoading(false);
    }
  };

  return (
      <form onSubmit={onSubmit} className="space-y-4 max-w-sm w-full">
        <div>
          <label className="block text-sm font-medium mb-1">Email or phone</label>
          <input
              type="text"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              className="w-full border rounded px-3 py-2"
              required
          />
        </div>

        <div>
          <label className="block text-sm font-medium mb-1">Password</label>
          <div className="relative">
            <input
                type={showPassword ? "text" : "password"}
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                className="w-full border rounded px-3 py-2 pr-20"
                required
            />
            <button
                type="button"
                onClick={() => setShowPassword((s) => !s)}
                className="absolute right-2 top-1/2 -translate-y-1/2 text-sm text-brand-600"
                aria-label={showPassword ? "Hide password" : "Show password"}
            >
              {showPassword ? "Hide" : "Show"}
            </button>
          </div>
          <div className="mt-1">
            <a
                href="/forgot-password"
                className="text-xs text-brand-600 hover:underline"
            >
              Forgot your password?
            </a>
          </div>
          <div className="mt-1">
            <a
                href={registerHref}
                className="text-xs text-brand-600 hover:underline"
            >
              Don't have an account? Sign up here.
            </a>
          </div>
        </div>

        {error && (
          <div className="text-sm text-red-600">
            <p>{error}</p>
            {error.toLowerCase().includes('not yet active') && (
              <p className="mt-1 text-gray-600">Check your inbox for an activation email. If you didn&apos;t receive it, try logging in again to resend it.</p>
            )}
          </div>
        )}

        <button
            type="submit"
            disabled={loading}
            className="w-full bg-brand-600 hover:bg-brand-700 text-white rounded py-2 disabled:opacity-60"
        >
          {loading ? "Logging in..." : "Login"}
        </button>

        <p className="text-xs text-gray-500 text-center mt-3">
          By signing in, you acknowledge that you’ve read and agree to our{" "}
          <Link
              href="/legal/terms"
              target="_blank"
              className="text-brand-600 hover:underline"
          >
            Terms of Use
          </Link>{" "}
          and{" "}
          <Link
              href="/legal/privacy"
              target="_blank"
              className="text-brand-600 hover:underline"
          >
            Privacy Policy
          </Link>.
        </p>
      </form>
  );
}