import { useCallback, useRef, useState } from "preact/hooks";
import {
  encryptDataWithStoredPassword,
  getEncryptionPassword,
} from "../helpers.ts";

interface AddObligationModalProps {
  userId?: string;
}

export default function AddObligationModal(
  { userId }: AddObligationModalProps,
) {
  const formRef = useRef<HTMLFormElement>(null);
  const encryptedDataRef = useRef<HTMLInputElement>(null);
  const descriptionRef = useRef<HTMLInputElement>(null);
  const amountRef = useRef<HTMLInputElement>(null);
  // Removed duplicate useState for description/amount - use refs only for form values
  // State only for UI feedback, not form data
  const [error, _setError] = useState("");
  const [loading, setLoading] = useState(false);
  const today = new Date().toISOString().split("T")[0];

  // Only encrypt on submit, not on every keystroke - prevents V8 overload
  const handleEncryptData = useCallback(async () => {
    // Get current values from the form inputs
    const desc = descriptionRef.current?.value || "";
    const amt = amountRef.current?.value || "";

    // Check if encryption is available and encrypt the sensitive fields
    if (userId && (desc || amt)) {
      const encryptionPassword = getEncryptionPassword(userId);

      if (encryptionPassword) {
        try {
          const dataToEncrypt = {
            description: desc,
            amount: parseFloat(amt) || 0,
          };

          const encryptedData = await encryptDataWithStoredPassword(
            userId,
            JSON.stringify(dataToEncrypt),
          );

          if (encryptedData && encryptedDataRef.current) {
            // Set encrypted data
            encryptedDataRef.current.value = encryptedData;
          }
        } catch (error) {
          console.error("Failed to encrypt obligation data:", error);
        }
      }
    }
  }, [userId]);

  const handleSubmit = async () => {
    setLoading(true);

    // Encrypt data before submission
    await handleEncryptData();

    // Get current values from the form inputs
    const desc = descriptionRef.current?.value || "";
    const amt = amountRef.current?.value || "";

    // Clear plaintext fields if encryption was successful
    if (userId && (desc || amt)) {
      const encryptionPassword = getEncryptionPassword(userId);

      if (encryptionPassword && encryptedDataRef.current?.value) {
        if (descriptionRef.current) descriptionRef.current.value = "";
        if (amountRef.current) amountRef.current.value = "";
      }
    }

    // Submit the form using formRef
    setTimeout(() => {
      if (formRef.current) {
        formRef.current.submit();
      }
    }, 100);
  };

  return (
    <>
      <form
        ref={formRef}
        class="bg-white p-6 rounded shadow-lg w-full max-w-md space-y-4"
        method="POST"
        action="/api/create/obligation"
      >
        <h2 class="text-xl font-bold mb-2">Add Obligation</h2>
        {error && <div class="text-red-500 text-sm">{error}</div>}
        <input
          type="hidden"
          name="sender"
          value="/calendar/budget-obligations?modal=off"
        />
        <input
          ref={encryptedDataRef}
          type="hidden"
          name="encrypted_data"
          value=""
        />
        <input
          ref={descriptionRef}
          class="w-full border p-2 rounded"
          name="description"
          placeholder="Description"
          required
        />
        <input
          ref={amountRef}
          class="w-full border p-2 rounded"
          name="amount"
          placeholder="Amount"
          type="number"
          step="0.01"
          required
        />
        <select
          class="w-full border p-2 rounded"
          name="frequency"
          defaultValue="Monthly"
        >
          <option value="One-time">One-time</option>
          <option value="Biweekly">Biweekly</option>
          <option value="Weekly">Weekly</option>
          <option value="Monthly">Monthly</option>
          <option value="Quarterly">Quarterly</option>
          <option value="Yearly">Yearly</option>
        </select>
        <input
          class="w-full border p-2 rounded"
          name="due_date"
          type="date"
          defaultValue={today}
          required
        />
      </form>
      <div class="flex justify-end space-x-2">
        <a
          href="/calendar/budget-obligations"
          class="px-4 py-2 bg-gray-200 rounded hover:bg-gray-300 text-center inline-block"
        >
          Cancel
        </a>
        <button
          type="button"
          onClick={handleSubmit}
          class="px-4 py-2 bg-blue-600 text-white rounded hover:bg-blue-700"
          disabled={loading}
        >
          {loading ? "Adding..." : "Add"}
        </button>
      </div>
    </>
  );
}