package main

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

	"github.com/local/glpi-neural-brain/internal/activity"
	"github.com/local/glpi-neural-brain/internal/config"
	"github.com/local/glpi-neural-brain/internal/engine"
	"github.com/local/glpi-neural-brain/internal/graph"
	"github.com/local/glpi-neural-brain/internal/ingest"
	webui "github.com/local/glpi-neural-brain/internal/web"
)

func main() {
	cfg, err := config.Load()
	if err != nil {
		slog.Error("configuration invalid", "error", err)
		os.Exit(1)
	}
	slog.SetDefault(slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelInfo})))
	g, err := graph.Open(cfg.DataDir)
	if err != nil {
		slog.Error("graph open failed", "error", err)
		os.Exit(1)
	}
	broker := activity.New(120)
	eng := engine.New(cfg, g, broker)
	ctx, cancel := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer cancel()
	eng.Start(ctx)
	watcher := ingest.NewAgentWatcher(cfg.AgentRunsFiles, g, broker)
	watcher.Start(ctx)
	ui := &webui.Server{Engine: eng, Graph: g, Broker: broker, APIKey: cfg.APIKey}
	srv := &http.Server{Addr: cfg.ListenAddr, Handler: ui.Handler(), ReadHeaderTimeout: 10 * time.Second, ReadTimeout: 30 * time.Second, WriteTimeout: 10 * time.Minute, IdleTimeout: 90 * time.Second}
	go func() {
		storage := g.StorageStatus()
		slog.Info("neural brain listening", "addr", cfg.ListenAddr, "knowledge_dirs", cfg.KnowledgeDirs, "staging_dirs", cfg.StagingDirs, "graph_backend", storage.Backend, "graph_db", storage.Path)
		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			slog.Error("server failed", "error", err)
			cancel()
		}
	}()
	<-ctx.Done()
	shutdown, c := context.WithTimeout(context.Background(), 10*time.Second)
	defer c()
	_ = srv.Shutdown(shutdown)
	_ = eng.Flush(shutdown)
	if err := g.Close(); err != nil {
		slog.Error("graph close failed", "error", err)
	}
}