package main

import (
	"context"
	"errors"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"git.apinb.com/bsm-sdk/core/infra"
	"git.apinb.com/bsm-sdk/core/middleware"
	"git.apinb.com/ops/files/internal/config"
	"git.apinb.com/ops/files/internal/impl"
	"git.apinb.com/ops/files/internal/jobs"
	"git.apinb.com/ops/files/internal/models"
	"git.apinb.com/ops/files/internal/routers"
	"github.com/gin-gonic/gin"
)

const ServiceKey = "Files"

func main() {
	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
	defer stop()

	config.New(ServiceKey)
	impl.NewImpl()
	if err := models.RequireSchemaVersion(impl.DBService, "files"); err != nil {
		panic(err)
	}
	if err := models.RequireStorageProvider(impl.DBService, impl.StorageService.Provider()); err != nil {
		panic(err)
	}
	if err := jobs.StartPendingUploadCleanup(ctx); err != nil {
		if closeErr := impl.Close(); closeErr != nil {
			panic(errors.Join(err, closeErr))
		}
		panic(err)
	}
	if err := jobs.StartIntegrity(ctx); err != nil {
		stop()
		waitCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
		waitErr := jobs.Wait(waitCtx)
		cancel()
		if closeErr := impl.Close(); closeErr != nil {
			panic(errors.Join(err, waitErr, closeErr))
		}
		panic(errors.Join(err, waitErr))
	}

	app := gin.Default()
	middleware.Mode(app)
	app.Use(middleware.Cors())
	app.Use(gin.Recovery())
	app.HEAD("/", infra.Health)
	routers.Register(ServiceKey, app)

	serveErr := serve(ctx, app)
	stop()
	waitCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	waitErr := jobs.Wait(waitCtx)
	cancel()
	closeErr := impl.Close()
	if err := errors.Join(serveErr, waitErr, closeErr); err != nil {
		panic(err)
	}
}

func serve(ctx context.Context, app http.Handler) error {
	server := &http.Server{Addr: config.Spec.Addr, Handler: app, ReadHeaderTimeout: 10 * time.Second}
	errCh := make(chan error, 1)
	go func() { errCh <- server.ListenAndServe() }()
	select {
	case err := <-errCh:
		if errors.Is(err, http.ErrServerClosed) {
			return nil
		}
		return err
	case <-ctx.Done():
		shutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
		defer cancel()
		return server.Shutdown(shutdownCtx)
	}
}