package main

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

	"git.ryuvia.com/niklas/terdut-server/internal/api"
	"git.ryuvia.com/niklas/terdut-server/internal/config"
	"git.ryuvia.com/niklas/terdut-server/internal/db"
)

var version = "dev"

func main() {
	cfg := config.Load()

	database, err := db.Open(cfg.DSN)
	if err != nil {
		log.Fatalf("open db: %v", err)
	}
	defer database.Close()

	if err := db.Migrate(database); err != nil {
		log.Fatalf("migrate: %v", err)
	}

	notify := api.NotifyConfig{
		BaseURL:       cfg.NtfyURL,
		Token:         cfg.NtfyToken,
		FallbackTopic: cfg.NtfyFallbackTopic,
		PublicURL:     cfg.PublicURL,
		RepeatEvery:   cfg.NotifyRepeat,
	}

	// Dead man's switches live per team now. The environment variables are the
	// defaults a team starts from: every team without a configuration of its
	// own gets one from them here, and an owner's later edit is never
	// overwritten by a redeploy.
	deadman := api.ParseDeadmanConfig(cfg.DeadmanMatchers, cfg.DeadmanTimeout, cfg.DeadmanSeverity)
	if err := api.SeedDeadmanConfigs(context.Background(), database, deadman); err != nil {
		log.Fatalf("seed dead man's switch defaults: %v", err)
	}

	// The behaviour knobs move into the database on first start, after which an
	// administrator owns them and a redeploy leaves them alone.
	if err := api.SeedSettings(context.Background(), database, cfg); err != nil {
		log.Fatalf("seed settings: %v", err)
	}

	router := api.NewRouter(database, notify, cfg)

	srv := &http.Server{
		Addr:         cfg.Addr,
		Handler:      router,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	go api.StartArchiver(ctx, database, cfg.ArchiveAfter, cfg.StaleAfter, notify)
	go api.StartNotifier(ctx, database, notify)

	go func() {
		log.Printf("terdut-server %s listening on %s", version, cfg.Addr)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("listen: %v", err)
		}
	}()

	<-ctx.Done()
	log.Println("shutting down")
	shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := srv.Shutdown(shutdownCtx); err != nil {
		log.Printf("shutdown: %v", err)
	}
}