package neko

import (
	"context"
	"fmt"
	"net/http"
	"os"
	"os/signal"
	"runtime"

	"n.eko.moe/neko/internal/config"
	"n.eko.moe/neko/internal/structs"
	api "n.eko.moe/neko/internal/http"

	"github.com/rs/zerolog"
	"github.com/rs/zerolog/log"
	"github.com/spf13/cobra"
)

var (
	//
	buildDate = ""
	//
	gitCommit = ""
	//
	gitVersion = ""
	//
	gitState = ""
	// Major version when you make incompatible API changes,
	major = "0"
	// Minor version when you add functionality in a backwards-compatible manner, and
	minor = "0"
	// Patch version when you make backwards-compatible bug fixeneko.
	patch = "0"
)

var Service *Neko

func init() {
	Service = &Neko{
		Version: &structs.Version{
			Major:        major,
			Minor:        minor,
			Patch:        patch,
			GitVersion:   gitVersion,
			GitCommit:    gitCommit,
			GitTreeState: gitState,
			BuildDate:    buildDate,
			GoVersion:    runtime.Version(),
			Compiler:     runtime.Compiler,
			Platform:     fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
		},
		Root:  &config.Root{},
		Serve: &config.Serve{},
	}
}

type Neko struct {
	Version *structs.Version
	Root    *config.Root
	Serve   *config.Serve
	Logger  zerolog.Logger
	http    *http.Server
}

func (neko *Neko) Preflight() {
	neko.Logger = log.With().Str("service", "neko").Logger()
}

func (neko *Neko) Start() {
	server := api.New(neko.Serve.Bind, neko.Serve.Password, neko.Serve.Static)

	if neko.Serve.Cert != "" && neko.Serve.Key != "" {
		go func() {
			if err := server.ListenAndServeTLS(neko.Serve.Cert, neko.Serve.Key); err != http.ErrServerClosed {
				neko.Logger.Panic().Err(err).Msg("Unable to start https server")
			}
		}()
		neko.Logger.Info().Msgf("HTTPS listening on %s", server.Addr)
	} else {
		go func() {
			if err := server.ListenAndServe(); err != http.ErrServerClosed {
				neko.Logger.Panic().Err(err).Msg("Unable to start http server")
			}
		}()
		neko.Logger.Warn().Msgf("HTTP listening on %s", server.Addr)
	}

	neko.http = server
}

func (neko *Neko) Shutdown() {
	if neko.http != nil {
		if err := neko.http.Shutdown(context.Background()); err != nil {
			neko.Logger.Err(err).Msg("HTTP server shutdown with an error")
		} else {
			neko.Logger.Debug().Msg("HTTP server shutdown")
		}
	}
}

func (neko *Neko) ServeCommand(cmd *cobra.Command, args []string) {
	neko.Logger.Info().Msg("Starting HTTP/S server")
	neko.Start()

	neko.Logger.Info().Msg("Service ready")

	quit := make(chan os.Signal)
	signal.Notify(quit, os.Interrupt)
	sig := <-quit

	neko.Logger.Warn().Msgf("Received %s, attempting graceful shutdown: \n", sig)

	neko.Shutdown()
	neko.Logger.Info().Msg("Shutting down complete")
}