package misc

import (
	"errors"
	"fmt"
	"net"
	"syscall"
)

func ListenUnixSocket(path string) (listener net.Listener, replaced bool, err error) {
	listener, err = net.Listen("unix", path)
	if errors.Is(err, syscall.EADDRINUSE) {
		replaced = true
		if unlinkErr := syscall.Unlink(path); unlinkErr != nil {
			return listener, false, fmt.Errorf("remove existing socket %q: %w", path, unlinkErr)
		}
		listener, err = net.Listen("unix", path)
	}
	if err != nil {
		return listener, replaced, fmt.Errorf("listen on unix socket %q: %w", path, err)
	}
	return listener, replaced, nil
}

func Listen(net_, addr string) (listener net.Listener, err error) {
	if net_ == "unix" {
		listener, _, err = ListenUnixSocket(addr)
		if err != nil {
			return listener, fmt.Errorf("listen unix socket for web: %w", err)
		}
	} else {
		listener, err = net.Listen(net_, addr)
		if err != nil {
			return listener, fmt.Errorf("listen %s for web: %w", net_, err)
		}
	}
	return listener, nil
}

package misc

import (
	"errors"
	"fmt"
	"net"
	"syscall"
)

func ListenUnixSocket(path string) (listener net.Listener, replaced bool, err error) {
	listener, err = net.Listen("unix", path)
	if errors.Is(err, syscall.EADDRINUSE) {
		replaced = true
		if unlinkErr := syscall.Unlink(path); unlinkErr != nil {
			return listener, false, fmt.Errorf("remove existing socket %q: %w", path, unlinkErr)
		}
		listener, err = net.Listen("unix", path)
	}
	if err != nil {
		return listener, replaced, fmt.Errorf("listen on unix socket %q: %w", path, err)
	}
	return listener, replaced, nil
}

package hooks

import (
	"fmt"
	"net"

	"github.com/gliderlabs/ssh"
	"go.lindenii.runxiyu.org/forge/forged/internal/common/cmap"
	"go.lindenii.runxiyu.org/forge/forged/internal/common/misc"
)

type Server struct {
	hookMap         cmap.Map[string, hookInfo]
	socketPath      string
	executablesPath string
}

type Config struct {
	Socket string `scfg:"socket"`
	Execs  string `scfg:"execs"`
}

type hookInfo struct {
	session      ssh.Session
	pubkey       string
	directAccess bool
	repoPath     string
	userID       int
	userType     string
	repoID       int
	groupPath    []string
	repoName     string
	contribReq   string
}

func New(config Config) (pool *Server) {

func New(config Config) (server *Server) {

	return &Server{
		socketPath:      config.Socket,
		executablesPath: config.Execs,
	}
}

func (pool *Server) Run() error {
	listener, _, err := misc.ListenUnixSocket(pool.socketPath)

func (server *Server) Run() error {
	listener, _, err := misc.ListenUnixSocket(server.socketPath)

	if err != nil {
		return fmt.Errorf("listen unix socket for hooks: %w", err)
	}

	for {
		conn, err := listener.Accept()
		if err != nil {
			return fmt.Errorf("accept conn: %w", err)
		}

		go pool.handleConn(conn)

		go server.handleConn(conn)

	}
}

func (pool *Server) handleConn(conn net.Conn) {

func (server *Server) handleConn(conn net.Conn) {

	panic("TODO: handle hook connection")
}

package lmtp

import (
	"fmt"
	"net"

	"go.lindenii.runxiyu.org/forge/forged/internal/common/misc"
)

type Server struct {
	socket       string
	domain       string
	maxSize      int64
	writeTimeout uint32
	readTimeout  uint32
}

type Config struct {
	Socket       string `scfg:"socket"`
	Domain       string `scfg:"domain"`
	MaxSize      int64  `scfg:"max_size"`
	WriteTimeout uint32 `scfg:"write_timeout"`
	ReadTimeout  uint32 `scfg:"read_timeout"`
}

func New(config Config) (pool *Server) {

func New(config Config) (server *Server) {

	return &Server{
		socket:       config.Socket,
		domain:       config.Domain,
		maxSize:      config.MaxSize,
		writeTimeout: config.WriteTimeout,
		readTimeout:  config.ReadTimeout,
	}
}

func (pool *Server) Run() error {
	listener, _, err := misc.ListenUnixSocket(pool.socket)

func (server *Server) Run() error {
	listener, _, err := misc.ListenUnixSocket(server.socket)

	if err != nil {
		return fmt.Errorf("listen unix socket for LMTP: %w", err)
	}

	for {
		conn, err := listener.Accept()
		if err != nil {
			return fmt.Errorf("accept conn: %w", err)
		}

		go pool.handleConn(conn)

		go server.handleConn(conn)

	}
}

func (pool *Server) handleConn(conn net.Conn) {

func (server *Server) handleConn(conn net.Conn) {

	panic("TODO: handle LMTP connection")
}

package ssh

type Server struct{}

import (
	"fmt"
	"os"

	gliderssh "github.com/gliderlabs/ssh"
	"go.lindenii.runxiyu.org/forge/forged/internal/common/misc"
	gossh "golang.org/x/crypto/ssh"
)

type Config struct {
	Net  string `scfg:"net"`
	Addr string `scfg:"addr"`
	Key  string `scfg:"key"`
	Root string `scfg:"root"`
}

type Server struct {
	gliderServer *gliderssh.Server
	privkey      gossh.Signer
	pubkeyString string
	pubkeyFP     string
	net          string
	addr         string
	root         string
}

func New(config Config) (server *Server, err error) {
	server = &Server{
		net:  config.Net,
		addr: config.Addr,
		root: config.Root,
	}

	var privkeyBytes []byte
	if privkeyBytes, err = os.ReadFile(config.Key); err != nil {
		return server, fmt.Errorf("read SSH private key: %w", err)
	}
	if server.privkey, err = gossh.ParsePrivateKey(privkeyBytes); err != nil {
		return server, fmt.Errorf("parse SSH private key: %w", err)
	}
	server.pubkeyString = misc.BytesToString(gossh.MarshalAuthorizedKey(server.privkey.PublicKey()))
	server.pubkeyFP = gossh.FingerprintSHA256(server.privkey.PublicKey())

	server.gliderServer = &gliderssh.Server{
		Handler:                    handle,
		PublicKeyHandler:           func(ctx gliderssh.Context, key gliderssh.PublicKey) bool { return true },
		KeyboardInteractiveHandler: func(ctx gliderssh.Context, challenge gossh.KeyboardInteractiveChallenge) bool { return true },
	}
	server.gliderServer.AddHostKey(server.privkey)

	return
}

func (server *Server) Run() (err error) {
	listener, err := misc.Listen(server.net, server.addr)
	if err = server.gliderServer.Serve(listener); err != nil {
		return fmt.Errorf("serve SSH: %w", err)
	}
	panic("unreachable")
}

func handle(session gliderssh.Session) {
	panic("SSH server handler not implemented yet")
}

package web

import "net/http"

import (
	"fmt"
	"net/http"
	"time"

	"go.lindenii.runxiyu.org/forge/forged/internal/common/misc"
)

type Server struct {

	net        string
	addr       string
	root       string

	httpServer *http.Server
}

type handler struct{}

func (h *handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
}

type Config struct {

	Net          string `scfg:"net"`
	Addr         string `scfg:"addr"`
	CookieExpiry int    `scfg:"cookie_expiry"`
	Root         string `scfg:"root"`
	ReadTimeout  uint32 `scfg:"read_timeout"`
	WriteTimeout uint32 `scfg:"write_timeout"`
	IdleTimeout  uint32 `scfg:"idle_timeout"`
	ReverseProxy bool   `scfg:"reverse_proxy"`

	Net            string `scfg:"net"`
	Addr           string `scfg:"addr"`
	Root           string `scfg:"root"`
	CookieExpiry   int    `scfg:"cookie_expiry"`
	ReadTimeout    uint32 `scfg:"read_timeout"`
	WriteTimeout   uint32 `scfg:"write_timeout"`
	IdleTimeout    uint32 `scfg:"idle_timeout"`
	MaxHeaderBytes int    `scfg:"max_header_bytes"`
	ReverseProxy   bool   `scfg:"reverse_proxy"`
}

func New(config Config) (server *Server) {
	handler := &handler{}
	return &Server{
		net:  config.Net,
		addr: config.Addr,
		root: config.Root,
		httpServer: &http.Server{
			Handler:        handler,
			ReadTimeout:    time.Duration(config.ReadTimeout) * time.Second,
			WriteTimeout:   time.Duration(config.WriteTimeout) * time.Second,
			IdleTimeout:    time.Duration(config.IdleTimeout) * time.Second,
			MaxHeaderBytes: config.MaxHeaderBytes,
		},
	}
}

func (server *Server) Run() (err error) {
	listener, err := misc.Listen(server.net, server.addr)
	if err = server.httpServer.Serve(listener); err != nil {
		return fmt.Errorf("serve web: %w", err)
	}
	panic("unreachable")

}

package server

import (
	"context"
	"fmt"
	"log"

	"go.lindenii.runxiyu.org/forge/forged/internal/config"
	"go.lindenii.runxiyu.org/forge/forged/internal/database"
	"go.lindenii.runxiyu.org/forge/forged/internal/incoming/hooks"
	"go.lindenii.runxiyu.org/forge/forged/internal/incoming/lmtp"
	"go.lindenii.runxiyu.org/forge/forged/internal/incoming/ssh"
	"go.lindenii.runxiyu.org/forge/forged/internal/incoming/web"
)

type Server struct {
	config config.Config

	database   database.Database
	hookServer *hooks.Server
	lmtpServer *lmtp.Server
	webServer  *web.Server
	sshServer  *ssh.Server

	globalData struct {
		SSHPubkey      string
		SSHFingerprint string
		Version        string
	}
}

func New(ctx context.Context, configPath string) (server *Server, err error) {
	server = &Server{}

	server.config, err = config.Open(configPath)
	if err != nil {
		return server, fmt.Errorf("open config: %w", err)
	}

	// TODO: Should this belong here, or in Run()?

	server.database, err = database.Open(ctx, server.config.DB)
	if err != nil {
		return server, fmt.Errorf("open database: %w", err)
	}

	server.hookServer = hooks.New(server.config.Hooks)

	server.lmtpServer = lmtp.New(server.config.LMTP)

	// TODO: Add HTTP and SSH servers

	server.webServer = web.New(server.config.Web)
	server.sshServer, err = ssh.New(server.config.SSH)
	if err != nil {
		return server, fmt.Errorf("create SSH server: %w", err)
	}

	return server, nil
}

func (s *Server) Run() error {
	// TODO: Not running git2d because it should be run separately.
	// This needs to be documented somewhere, hence a TODO here for now.

	go func() {
		if err := s.hookServer.Run(); err != nil {

			log.Fatalf("run hook pool: %v", err)

			log.Fatalf("run hook server: %v", err)

		}
	}()

	go func() {
		if err := s.lmtpServer.Run(); err != nil {

			log.Fatalf("run LMTP pool: %v", err)

			log.Fatalf("run LMTP server: %v", err)
		}
	}()

	go func() {
		if err := s.webServer.Run(); err != nil {
			log.Fatalf("run web server: %v", err)
		}
	}()

	go func() {
		if err := s.sshServer.Run(); err != nil {
			log.Fatalf("run SSH server: %v", err)

		}
	}()

	return nil
}