package main

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

	"provisioning/internal/api"
	"provisioning/internal/config"
	"provisioning/internal/db"
	"provisioning/internal/events"
	"provisioning/internal/httpserver"
	"provisioning/internal/infra"
	"provisioning/internal/orchestrator"
	"provisioning/internal/pxe"
	"provisioning/internal/store"
)

func main() {
	cfgPath := flag.String("config", "provisioning.yaml", "path to config file")
	flag.Parse()

	cfg, err := config.Load(*cfgPath)
	if err != nil {
		log.Fatalf("config: %v", err)
	}

	serverTypes, err := config.LoadServerTypes(cfg.ServerTypePath)
	if err != nil {
		log.Fatalf("server types: %v", err)
	}

	if err := os.MkdirAll(filepath.Dir(cfg.Database.Path), 0o755); err != nil {
		log.Fatalf("create db dir: %v", err)
	}
	database, err := db.Open(cfg.Database.Path)
	if err != nil {
		log.Fatalf("database: %v", err)
	}
	defer database.Close()

	hosts := &store.Hosts{DB: database}
	ops := &store.Operations{DB: database}
	locks := &store.Locks{DB: database, TTLMinutes: cfg.Locks.TTLMinutes}
	images := &store.Images{DB: database}

	hub := events.NewHub()

	runner := &orchestrator.Runner{
		Hosts: hosts,
		Ops:   ops,
		Locks: locks,
		Hub:   hub,
	}

	pxeSupervisor := pxe.NewSupervisor(pxe.SupervisorConfig{
		Enabled:    cfg.PXE.Enabled,
		Interface:  cfg.PXE.Interface,
		Subnet:     cfg.PXE.Subnet,
		RuntimeDir: cfg.PXE.RuntimeDir,
		TFTPRoot:   cfg.PXE.TFTPRoot,
		DnsmasqBin: cfg.PXE.DnsmasqBin,
		PublicURL:  cfg.Server.PublicURL,
	})

	var infraClient *infra.Client
	if cfg.Infrastructure.BaseURL != "" {
		infraClient = infra.NewClient(cfg.Infrastructure.BaseURL, time.Duration(cfg.Infrastructure.TimeoutSec)*time.Second)
	}

	clusterJoiner := &orchestrator.ClusterJoiner{
		ExistingNode:    cfg.Proxmox.ExistingNode,
		ClusterName:     cfg.Proxmox.ClusterName,
		JoinFingerprint: cfg.Proxmox.JoinFingerprint,
	}

	hostOrch := &orchestrator.HostOrchestrator{
		Runner:      runner,
		Hosts:       hosts,
		Ops:         ops,
		Locks:       locks,
		Cluster:     clusterJoiner,
		InfraClient: infraClient,
		Config:      cfg,
		ServerTypes: serverTypes,
	}

	hostAPI := &api.HostAPI{
		Hosts:        hosts,
		Ops:          ops,
		Locks:        locks,
		Images:       images,
		Runner:       runner,
		Orchestrator: hostOrch,
		PXE:          pxeSupervisor,
		Config:       cfg,
		ServerTypes:  serverTypes,
	}

	bootAPI := &api.BootAPI{
		Hosts:        hosts,
		Images:       images,
		Runner:       runner,
		Orchestrator: hostOrch,
		Config:       cfg,
		ServerTypes:  serverTypes,
	}

	ui := &api.UI{
		Hosts:        hosts,
		Ops:          ops,
		Locks:        locks,
		Images:       images,
		Runner:       runner,
		Orchestrator: hostOrch,
		Hub:          hub,
		PXE:          pxeSupervisor,
		Config:       cfg,
		ServerTypes:  serverTypes,
	}

	router := httpserver.NewRouter(httpserver.Deps{
		HostAPI: hostAPI,
		BootAPI: bootAPI,
		UI:      ui,
		Hub:     hub,
	})

	srv := &http.Server{
		Addr:    cfg.Server.Bind,
		Handler: router,
	}

	// Start PXE
	allHosts, _ := hosts.List(context.Background())
	if err := pxeSupervisor.Start(context.Background(), allHosts); err != nil {
		log.Printf("pxe: failed to start: %v", err)
	}

	// Watch server types for hot reload
	stop := make(chan struct{})
	serverTypes.Watch(stop)

	// Start HTTP server
	go func() {
		log.Printf("listening on %s", cfg.Server.Bind)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("http: %v", err)
		}
	}()

	// Graceful shutdown
	shutdown := make(chan os.Signal, 1)
	signal.Notify(shutdown, os.Interrupt, syscall.SIGTERM)
	<-shutdown

	log.Printf("shutting down")
	close(stop)
	_ = pxeSupervisor.Shutdown()

	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := srv.Shutdown(ctx); err != nil {
		log.Printf("http shutdown: %v", err)
	}
	_ = hub.Shutdown(ctx)
}