import db from "@server/db";
import { MessageHandler } from "../ws";
import {
    clients,
    clientSites,
    exitNodes,
    Olm,
    olms,
    sites
} from "@server/db/schema";
import { eq, inArray } from "drizzle-orm";
import { addPeer, deletePeer } from "../newt/peers";
import logger from "@server/logger";

export const handleOlmRegisterMessage: MessageHandler = async (context) => {
    const { message, client: c, sendToClient } = context;
    const olm = c as Olm;
    logger.info("Handling register olm message!");
    if (!olm) {
        logger.warn("Olm not found");
        return;
    }
    if (!olm.clientId) {
        logger.warn("Olm has no client ID!");
        return;
    }
    const clientId = olm.clientId;
    const { publicKey } = message.data;
    if (!publicKey) {
        logger.warn("Public key not provided");
        return;
    }

    // Get the client
    const [client] = await db
        .select()
        .from(clients)
        .where(eq(clients.clientId, clientId))
        .limit(1);

    if (!client) {
        logger.warn("Client not found");
        return;
    }

    if (client.exitNodeId) {
        // Get the exit node for this site
        const [exitNode] = await db
            .select()
            .from(exitNodes)
            .where(eq(exitNodes.exitNodeId, client.exitNodeId))
            .limit(1);
    
        // Send holepunch message for each site
        sendToClient(olm.olmId, {
            type: "olm/wg/holepunch",
            data: {
                serverPubKey: exitNode.publicKey
            }
        });
    }

    // Update the client's public key
    await db
        .update(clients)
        .set({
            pubKey: publicKey
        })
        .where(eq(clients.clientId, olm.clientId))
        .returning();

    // Check if public key changed and handle old peer deletion later
    const pubKeyChanged = client.pubKey && client.pubKey !== publicKey;

    // Get all sites data
    const sitesData = await db
        .select()
        .from(sites)
        .innerJoin(clientSites, eq(sites.siteId, clientSites.siteId))
        .where(eq(clientSites.clientId, client.clientId));

    // Prepare an array to store site configurations
    const siteConfigurations = [];
    const now = new Date().getTime() / 1000;

    // Process each site
    for (const { sites: site } of sitesData) {
        if (!site.exitNodeId) {
            logger.warn(
                `Site ${site.siteId} does not have exit node, skipping`
            );
            continue;
        }

        // Validate endpoint and hole punch status
        if (!site.endpoint) {
            logger.warn(`Site ${site.siteId} has no endpoint, skipping`);
            continue;
        }

        if (site.lastHolePunch && now - site.lastHolePunch > 6) {
            logger.warn(
                `Site ${site.siteId} last hole punch is too old, skipping`
            );
            continue;
        }

        if (client.lastHolePunch && now - client.lastHolePunch > 6) {
            logger.warn(
                "Client last hole punch is too old, skipping all sites"
            );
            break;
        }

        // If public key changed, delete old peer from this site
        if (pubKeyChanged) {
            logger.info(
                `Public key mismatch. Deleting old peer from site ${site.siteId}...`
            );
            await deletePeer(site.siteId, client.pubKey!);
        }

        if (!site.subnet) {
            logger.warn(`Site ${site.siteId} has no subnet, skipping`);
            continue;
        }

        // Add the peer to the exit node for this site
        if (client.endpoint) { 
            logger.info(
                `Adding peer ${publicKey} to site ${site.siteId} with endpoint ${client.endpoint}`
            );
            await addPeer(site.siteId, {
                publicKey: publicKey,
                allowedIps: [client.subnet],
                endpoint: client.endpoint
            });
        } else {
            logger.warn(
                `Client ${client.clientId} has no endpoint, skipping peer addition`
            );  
        }

        // Add site configuration to the array
        siteConfigurations.push({
            siteId: site.siteId,
            endpoint: site.endpoint,
            publicKey: site.publicKey,
            serverIP: site.address
        });
    }

    // If we have no valid site configurations, don't send a connect message
    if (siteConfigurations.length === 0) {
        logger.warn("No valid site configurations found");
        return;
    }

    // Return connect message with all site configurations
    return {
        message: {
            type: "olm/wg/connect",
            data: {
                sites: siteConfigurations,
                tunnelIP: client.subnet
            }
        },
        broadcast: false,
        excludeSender: false
    };
};