package projet;

import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@WebServlet("/AfficherPage")
public class AfficherPage extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		HttpSession session = request.getSession();
		Utilisateur u = (Utilisateur) session.getAttribute("utilisateur");
		
		String idStr = request.getParameter("id");
		
		if(u != null) {
			u.chargerPages();
			u.chargerPagesPartagees();
			ArrayList<Page> listePages = u.getListePages();
			ArrayList<Page> listePagesPartagees = u.getListePagesPartagees();
			ArrayList<Message> listeMessages = Message.getListeMessages();
			ArrayList<Utilisateur> listeUtilisateurs = Utilisateur.getListeUtilisateurs();
			
			request.setAttribute("listePages", listePages);
			request.setAttribute("listePagesPartagees", listePagesPartagees);
			request.setAttribute("listeMessages", listeMessages);
			request.setAttribute("listeUtilisateurs", listeUtilisateurs);
			
			String menuHtml = genererMenuHTML(u.getId());
			request.setAttribute("menuHtml", menuHtml);
			
			
			if (idStr != null ) {
				try {
					int id = Integer.parseInt(idStr);
					Page page = Page.getPageById(u.getId(), id);					
					
					if (page != null) {
						request.setAttribute("page", page);
						
						Map<Integer, String> hierarchie = u.getHierarchie(id);
						request.setAttribute("hierarchie", hierarchie);
						
						request.getRequestDispatcher("/WEB-INF/AfficherPage.jsp").forward(request, response);
						return;
					} else {
						request.getRequestDispatcher("/WEB-INF/AfficherPage.jsp").forward(request, response);
						return;
					}		                
				} catch (NumberFormatException e) {
		            response.sendError(HttpServletResponse.SC_BAD_REQUEST, "ID invalide");
		            return;
		        }
			}
			RequestDispatcher rd = request.getRequestDispatcher("/WEB-INF/AfficherPage.jsp");
			rd.forward(request, response);
		} else {
			response.sendRedirect("/Projet/");
		}		
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	}
	
	public static String genererMenuHTML(int idU) {
	    Map<Integer, List<Page>> arbre = Page.getArbreDesPages(idU);    
	    StringBuilder html = new StringBuilder();
	    html.append("<ul>\n");
	    construireHTMLRecursif(arbre, -1, html, 6);
	    html.append("					</ul>\n");
	    return html.toString();
	}
	
	private static void construireHTMLRecursif(Map<Integer, List<Page>> arbre, int parentId, StringBuilder html, int indentLevel) {
	    List<Page> enfants = arbre.get(parentId);
	    if (enfants == null || enfants.isEmpty()) return;

	    String indent = "\t".repeat(indentLevel);

	    for (Page p : enfants) {
	        List<Page> sousPages = arbre.get(p.getId());
	        boolean aSousPages = sousPages != null && !sousPages.isEmpty();

	        html.append(indent).append("<li>\n");

	        html.append(indent).append("\t<div class='is-flex is-align-items-center is-justify-content-space-between'>\n");
	        html.append(indent).append("\t\t<a href='AfficherPage?id=").append(p.getId()).append("'>")
	            .append(p.getTitre()).append("</a>\n");
	        html.append(indent).append("\t\t<button class='delete delete-page-btn has-background-danger ml-2' data-id='")
	            .append(p.getId()).append("'></button>\n");
	        html.append(indent).append("\t</div>\n");

	        if (aSousPages) {
	            html.append(indent).append("\t<ul class='ml-4'>\n");
	            construireHTMLRecursif(arbre, p.getId(), html, indentLevel + 1);
	            html.append(indent).append("\t</ul>\n");
	        }

	        html.append(indent).append("</li>\n");
	    }
	}
}