package ssh

import (
	"context"
	"errors"
	"fmt"
	"os"

	"time"

	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"`

	Net             string `scfg:"net"`
	Addr            string `scfg:"addr"`
	Key             string `scfg:"key"`
	Root            string `scfg:"root"`
	ShutdownTimeout uint32 `scfg:"shutdown_timeout"`

}

type Server struct {

	gliderServer *gliderssh.Server
	privkey      gossh.Signer
	pubkeyString string
	pubkeyFP     string
	net          string
	addr         string
	root         string

	gliderServer    *gliderssh.Server
	privkey         gossh.Signer
	pubkeyString    string
	pubkeyFP        string
	net             string
	addr            string
	root            string
	shutdownTimeout uint32

}

func New(config Config) (server *Server, err error) {
	server = &Server{

		net:  config.Net,
		addr: config.Addr,
		root: config.Root,

		net:             config.Net,
		addr:            config.Addr,
		root:            config.Root,
		shutdownTimeout: config.ShutdownTimeout,

	}

	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(ctx context.Context) (err error) {
	listener, err := misc.Listen(server.net, server.addr)
	defer func() {
		_ = listener.Close()
	}()

	go func() {
		<-ctx.Done()

		_ = server.gliderServer.Close()
		_ = listener.Close() // unnecessary?
		// TODO: Log the error

		shCtx, cancel := context.WithTimeout(context.Background(), time.Duration(server.shutdownTimeout)*time.Second)
		defer cancel()
		_ = server.gliderServer.Shutdown(shCtx)
		_ = listener.Close()

	}()

	if err = server.gliderServer.Serve(listener); err != nil {
		if errors.Is(err, gliderssh.ErrServerClosed) {
			return 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 (
	"context"
	"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

	net             string
	addr            string
	root            string
	httpServer      *http.Server
	shutdownTimeout uint32

}

type handler struct{}

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

type Config struct {

	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"`

	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"`
	ShutdownTimeout uint32 `scfg:"shutdown_timeout"`

}

func New(config Config) (server *Server) {
	handler := &handler{}
	return &Server{

		net:  config.Net,
		addr: config.Addr,
		root: config.Root,

		net:             config.Net,
		addr:            config.Addr,
		root:            config.Root,
		shutdownTimeout: config.ShutdownTimeout,

		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(ctx context.Context) (err error) {
	listener, err := misc.Listen(server.net, server.addr)
	defer func() {
		_ = listener.Close()
	}()

	go func() {
		<-ctx.Done()

		_ = server.httpServer.Close()
		_ = listener.Close() // unnecessary?
		// TODO: Log the error

		shCtx, cancel := context.WithTimeout(context.Background(), time.Duration(server.shutdownTimeout)*time.Second)
		defer cancel()
		_ = server.httpServer.Shutdown(shCtx)
		_ = listener.Close()

	}()

	if err = server.httpServer.Serve(listener); err != nil {
		if err == http.ErrServerClosed {
			return nil
		}
		return fmt.Errorf("serve web: %w", err)
	}
	panic("unreachable")
}