package com.hithomelabs.cftunnels.Services;

import com.hithomelabs.cftunnels.Entity.Mapping;
import com.hithomelabs.cftunnels.Entity.Protocol;
import com.hithomelabs.cftunnels.Entity.Request;
import com.hithomelabs.cftunnels.Entity.Tunnel;
import com.hithomelabs.cftunnels.Entity.User;
import com.hithomelabs.cftunnels.Models.Ingress;
import com.hithomelabs.cftunnels.Repositories.MappingRepository;
import com.hithomelabs.cftunnels.Repositories.RequestRepository;
import com.hithomelabs.cftunnels.Repositories.TunnelRepository;
import com.hithomelabs.cftunnels.Repositories.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.security.oauth2.core.oidc.user.OidcUser;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.UUID;

@Service
public class MappingRequestService {

    @Autowired
    UserRepository userRepository;

    @Autowired
    MappingRepository mappingRepository;

    @Autowired
    RequestRepository requestRepository;

    @Autowired
    TunnelRepository tunnelRepository;

    @Autowired
    CloudflareAPIService cloudflareAPIService;

    public Mapping createMapping(UUID tunnelId, Ingress ingress){
        Tunnel tunnel = tunnelRepository.findById(tunnelId).orElseThrow(() -> new RuntimeException("Tunnel not found"));
        Mapping mapping = createMappingFromTunnelIngress(tunnel, ingress);
        return mappingRepository.save(mapping);
    }

    public Request createRequest(Mapping mapping, User user){
        Request request = new Request();
        request.setMapping(mapping);
        request.setCreatedBy(user);
        request.setStatus(Request.RequestStatus.PENDING);
        return requestRepository.save(request);
    }

    public Request createMappingRequest(String tunnelId, Ingress ingress, OidcUser oidcUser){
        User user = userRepository.findByEmail(oidcUser.getEmail()).orElseGet(()-> mapUser(oidcUser));
        Mapping mapping = createMapping(UUID.fromString(tunnelId), ingress);
        return createRequest(mapping, user);
    }

    @Transactional(readOnly = true)
    public List<Request> getAllRequests() {
        return requestRepository.findAllWithDetails();
    }

    public User mapUser(OidcUser oidcUser){
        String email = oidcUser.getEmail();
        String name = oidcUser.getNickName();
        User user = new User();
        user.setEmail(email);
        user.setName(name);
        userRepository.save(user);
        return user;
    }

    public Mapping createMappingFromTunnelIngress(Tunnel tunnel, Ingress ingress){
        Mapping mapping = new Mapping();
        mapping.setTunnel(tunnel);
        
        String serviceString = ingress.getService().toLowerCase();
        Protocol protocol = parseProtocol(serviceString);
        mapping.setProtocol(protocol);
        
        mapping.setPort(Integer.parseInt(ingress.getService().split(":")[2]));
        mapping.setSubdomain(ingress.getHostname().split("\\.")[0]);
        return mapping;
    }

    private Protocol parseProtocol(String serviceString) {
        if (serviceString.startsWith("https://")) {
            return Protocol.HTTPS;
        } else if (serviceString.startsWith("tcp://")) {
            return Protocol.TCP;
        } else if (serviceString.startsWith("ssh://")) {
            return Protocol.SSH;
        }
        return Protocol.HTTP;
    }

    @Transactional
    public Request approveRequest(UUID requestId, User approver) {
        Request request = requestRepository.findByIdWithDetails(requestId)
                .orElseThrow(() -> new NoSuchElementException("Request not found"));

        if (request.getStatus() != Request.RequestStatus.PENDING) {
            throw new IllegalStateException("Request is not in PENDING status");
        }

        Mapping mapping = request.getMapping();
        Tunnel tunnel = mapping.getTunnel();
        
        Ingress ingress = createIngressFromMapping(mapping);
        
        ResponseEntity<?> response = cloudflareAPIService.addTunnelIngress(
                tunnel.getId().toString(), 
                ingress
        );

        if (!response.getStatusCode().is2xxSuccessful()) {
            throw new RuntimeException("Failed to add mapping to Cloudflare");
        }

        request.setStatus(Request.RequestStatus.APPROVED);
        request.setAcceptedBy(approver);
        return requestRepository.save(request);
    }

    @Transactional
    public Request rejectRequest(UUID requestId, User rejecter) {
        Request request = requestRepository.findByIdWithDetails(requestId)
                .orElseThrow(() -> new NoSuchElementException("Request not found"));

        if (request.getStatus() != Request.RequestStatus.PENDING) {
            throw new IllegalStateException("Request is not in PENDING status");
        }

        request.setStatus(Request.RequestStatus.REJECTED);
        request.setAcceptedBy(rejecter);
        return requestRepository.save(request);
    }

    private static final String SERVER_IP = "192.168.0.100";

    private Ingress createIngressFromMapping(Mapping mapping) {
        Tunnel tunnel = mapping.getTunnel();
        String protocol = mapping.getProtocol().name().toLowerCase();
        String service = protocol + "://" + SERVER_IP + ":" + mapping.getPort();
        String hostname = mapping.getSubdomain() + ".hithomelabs.com";
        return new Ingress(service, hostname, null, null);
    }
}