import javax.swing.*;
import java.awt.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class BorrowingFormPanel extends JPanel {

    private final LibraryController controller;
    private final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

    public BorrowingFormPanel(LibraryController controller) {
        this.controller = controller;
        buildUI();
    }

    private void buildUI() {
        setLayout(new BorderLayout());

        JLabel header = new JLabel("Borrowing Management", SwingConstants.CENTER);
        header.setFont(new Font("Arial", Font.BOLD, 18));
        add(header, BorderLayout.NORTH);

        JPanel form = new JPanel(new GridLayout(9, 2, 10, 10));

        JTextField memberField = new JTextField();
        JTextField isbnField = new JTextField();
        JTextField dateField = new JTextField("2025-11-30");

        JButton createBtn = new JButton("Create Borrowing");

        JTextField searchMemberField = new JTextField();
        JButton searchMemberBtn = new JButton("View Borrowings by Member");

        JTextField searchBookField = new JTextField();
        JButton searchBookBtn = new JButton("View Borrowings by Book");

        form.add(new JLabel("Member ID:"));
        form.add(memberField);

        form.add(new JLabel("Book ISBN:"));
        form.add(isbnField);

        form.add(new JLabel("Borrow Date (YYYY-MM-DD):"));
        form.add(dateField);

        form.add(createBtn);
        form.add(new JLabel());

        form.add(new JLabel("Search Member Borrowings:"));
		form.add(new JLabel());
        form.add(searchMemberField);
        form.add(searchMemberBtn);

        form.add(new JLabel("Search Book Borrowings:"));
		form.add(new JLabel());
        form.add(searchBookField);
        form.add(searchBookBtn);

        JPanel formWrapper = new JPanel(new FlowLayout(FlowLayout.LEFT));
		formWrapper.add(form);
		add(formWrapper, BorderLayout.WEST);

        JTextArea output = new JTextArea();
        output.setEditable(false);
        add(new JScrollPane(output), BorderLayout.CENTER);

        createBtn.addActionListener(e -> {

            String memberId = memberField.getText().trim();
            String isbn = isbnField.getText().trim();
            String dateStr = dateField.getText().trim();

            if (memberId.isEmpty() || isbn.isEmpty() || dateStr.isEmpty()) {
                JOptionPane.showMessageDialog(this, "Please fill all fields.");
                return;
            }

            // ------ Check Member ------
            Member m = controller.findMember(memberId);
            if (m == null) {
                JOptionPane.showMessageDialog(this, "Member not found: " + memberId);
                return;
            }

            // ------ Check Book ------
            Book b = controller.findBook(isbn);
            if (b == null) {
                JOptionPane.showMessageDialog(this, "Book not found: " + isbn);
                return;
            }

            // ------ Parse Date ------
            Date borrowDate;
            try {
                borrowDate = sdf.parse(dateStr);
            } catch (ParseException ex) {
                JOptionPane.showMessageDialog(this, "Invalid date format. Use YYYY-MM-DD.");
                return;
            }

            // ------ Create Borrowing ------
            Borrowing bor = new Borrowing(m, b, borrowDate, null);
            controller.addBorrowing(bor);

            output.setText("Borrowing created:\n"
                    + m.getId() + " -> " + b.getIsbn()
                    + " on " + sdf.format(borrowDate));
        });

        searchMemberBtn.addActionListener(e -> {
            String id = searchMemberField.getText().trim();
            var list = controller.getBorrowingsForMember(id);

            if (list.isEmpty()) {
                output.setText("No borrowings for member: " + id);
                return;
            }

            StringBuilder sb = new StringBuilder("Borrowings for member " + id + ":\n");
            for (Borrowing b : list) {
                sb.append("• Book: ").append(b.getBook().getTitle())
                  .append("  (").append(b.getBorrowDate()).append(")\n");
            }

            output.setText(sb.toString());
        });

        searchBookBtn.addActionListener(e -> {
            String isbn = searchBookField.getText().trim();
            var list = controller.getBorrowingsForBook(isbn);

            if (list.isEmpty()) {
                output.setText("No borrowings for book: " + isbn);
                return;
            }

            StringBuilder sb = new StringBuilder("Borrowings for book " + isbn + ":\n");
            for (Borrowing b : list) {
                sb.append("• Member: ").append(b.getMember().getName())
                  .append("  (").append(b.getBorrowDate()).append(")\n");
            }

            output.setText(sb.toString());
        });
    }
}