package org.openautonomousconnection.oac2web.frontend;

import org.openautonomousconnection.oac2web.utils.Oac2WebApp;
import org.openautonomousconnection.oac2web.utils.RegistrarDao;
import org.openautonomousconnection.protocol.packets.v1_0_0.beta.web.WebResponsePacket;
import org.openautonomousconnection.protocol.side.web.ProtocolWebServer;
import org.openautonomousconnection.protocol.versions.v1_0_0.beta.WebRequestMethod;
import org.openautonomousconnection.webserver.api.Route;
import org.openautonomousconnection.webserver.api.SessionContext;
import org.openautonomousconnection.webserver.api.WebPage;
import org.openautonomousconnection.webserver.api.WebPageContext;
import org.openautonomousconnection.webserver.utils.Html;
import org.openautonomousconnection.webserver.utils.RequestParams;

import java.util.HashMap;
import java.util.Map;

/**
 * Dashboard page: lists owned infonames and allows modifications.
 *
 * Requires valid session.
 *
 * POST headers (action-based):
 * - action=create_infoname, tln, infoname
 * - action=delete_infoname, id
 * - action=add_record, id (infoname_id), sub, type, value, ttl, priority, port, weight
 */
@Route(path = "ins/dashboard")
public final class dashboard implements WebPage {

    @Override
    public WebResponsePacket handle(WebPageContext ctx) throws Exception {
        SessionContext session = SessionContext.from(ctx.client, (ProtocolWebServer) ctx.client.getServer(), ctx.request.getHeaders());
        if (!session.isValid() || session.getUser() == null) {
            return new WebResponsePacket(401, "text/plain", new HashMap<>(), Html.utf8("Authentication required (session)."));
        }

        int userId;
        try {
            userId = Integer.parseInt(session.getUser());
        } catch (Exception e) {
            return new WebResponsePacket(401, "text/plain", new HashMap<>(), Html.utf8("Invalid session user."));
        }

        Oac2WebApp app = Oac2WebApp.get();
        RegistrarDao dao = app.dao();

        String msg = null;
        String err = null;

        if (ctx.request.getMethod() == WebRequestMethod.POST) {
            RequestParams p = new RequestParams(ctx.request);
            String action = p.getOr("action", "").trim();

            try {
                if ("create_infoname".equalsIgnoreCase(action)) {
                    String tln = p.get("tln");
                    String info = p.get("infoname");

                    if (tln == null || tln.isBlank() || info == null || info.isBlank()) {
                        err = "Missing tln / infoname.";
                    } else {
                        Integer tlnId = dao.findTlnId(tln.trim()).orElse(null);
                        if (tlnId == null) {
                            err = "Unknown TLN: " + tln;
                        } else {
                            int newId = dao.createInfoName(tlnId, info.trim(), userId);
                            msg = "Created infoname id=" + newId + " (" + info + "." + tln + ")";
                        }
                    }
                } else if ("delete_infoname".equalsIgnoreCase(action)) {
                    int id = p.getInt("id", -1);
                    if (id <= 0) {
                        err = "Invalid id.";
                    } else if (!dao.isOwnerOfInfoName(id, userId)) {
                        err = "Not owner (edit/delete requires ownership).";
                    } else {
                        dao.deleteInfoName(id);
                        msg = "Deleted infoname id=" + id;
                    }
                } else if ("add_record".equalsIgnoreCase(action)) {
                    int infonameId = p.getInt("id", -1);
                    if (infonameId <= 0) {
                        err = "Invalid infoname id.";
                    } else if (!dao.isOwnerOfInfoName(infonameId, userId)) {
                        err = "Not owner (edit/delete requires ownership).";
                    } else {
                        String sub = p.get("sub");
                        String type = p.getOr("type", "").trim().toUpperCase();
                        String value = p.get("value");

                        int ttl = p.getInt("ttl", 3600);

                        Integer priority = (p.get("priority") == null) ? null : p.getInt("priority", 0);
                        Integer port = (p.get("port") == null) ? null : p.getInt("port", 0);
                        Integer weight = (p.get("weight") == null) ? null : p.getInt("weight", 0);

                        if (type.isBlank() || value == null || value.isBlank()) {
                            err = "Missing type/value.";
                        } else {
                            Integer subId = dao.ensureSubname(infonameId, sub);
                            int rid = dao.addRecord(infonameId, subId, type, value.trim(), ttl, priority, port, weight);
                            msg = "Added record id=" + rid + " type=" + type;
                        }
                    }
                } else if (!action.isBlank()) {
                    err = "Unknown action: " + action;
                }
            } catch (Exception e) {
                err = "Action failed: " + e.getMessage();
            }
        }

        return render(userId, msg, err, dao);
    }

    private WebResponsePacket render(int userId, String msg, String err, RegistrarDao dao) throws Exception {
        RegistrarDao.InfoNameRow[] owned = dao.listOwnedInfoNames(userId);

        StringBuilder list = new StringBuilder();
        if (owned.length == 0) {
            list.append("<p class='muted'>No infonames yet.</p>");
        } else {
            list.append("<ul>");
            for (RegistrarDao.InfoNameRow r : owned) {
                list.append("<li>")
                        .append("<code>").append(Html.esc(r.info())).append(".").append(Html.esc(r.tln())).append("</code>")
                        .append(" (id=").append(r.id()).append(")")
                        .append("</li>");
            }
            list.append("</ul>");
        }

        String body = """
                <div class="card">
                  <h2>Dashboard</h2>
                  <p class="muted">Owned by users.id = <code>%d</code></p>
                  %s
                  %s

                  <h3>Create InfoName</h3>
                  <p class="muted">POST headers: <code>action=create_infoname</code>, <code>tln</code>, <code>infoname</code></p>

                  <h3>Add Record</h3>
                  <p class="muted">POST headers: <code>action=add_record</code>, <code>id</code> (infoname id), optional <code>sub</code>, <code>type</code>, <code>value</code>, optional <code>ttl</code>, <code>priority</code>, <code>port</code>, <code>weight</code></p>

                  <h3>Delete InfoName</h3>
                  <p class="muted">POST headers: <code>action=delete_infoname</code>, <code>id</code></p>

                  <h3>Your InfoNames</h3>
                  %s

                  <div class="row">
                    <div class="col"><a href="/ins/index.html">Home</a></div>
                  </div>
                </div>
                """.formatted(
                userId,
                msg == null ? "" : "<p class='ok'>" + Html.esc(msg) + "</p>",
                err == null ? "" : "<p class='err'>" + Html.esc(err) + "</p>",
                list
        );

        String html = Html.page("Dashboard", body);

        Map<String, String> headers = new HashMap<>();
        return new WebResponsePacket(200, "text/html", headers, Html.utf8(html));
    }
}