// cryptomon: read-only crypto portfolio dashboard backed by Kraken.
// See data/settings.conf (auto-created next to the executable) for config.
package main

import (
	"flag"
	"fmt"
	"log/slog"
	"net/http"
	"os"
	"path/filepath"
	"time"

	"cryptomon/internal/authsvc"
	"cryptomon/internal/config"
	"cryptomon/internal/portfolio"
	"cryptomon/internal/store"
	"cryptomon/internal/web"
)

func main() {
	userReset := flag.Bool("userreset", false, "reset login to the default admin/admin and disable MFA, then exit")
	flag.Parse()

	exe, err := os.Executable()
	if err != nil {
		fatal("locate executable", err)
	}
	baseDir := filepath.Dir(exe)
	dataDir := filepath.Join(baseDir, "data")
	if err := os.MkdirAll(dataDir, 0700); err != nil {
		fatal("create data dir", err)
	}

	cfg, err := config.Load(filepath.Join(dataDir, "settings.conf"))
	if err != nil {
		fatal("load config", err)
	}

	dbPath := cfg.DBPath
	if !filepath.IsAbs(dbPath) {
		dbPath = filepath.Join(baseDir, dbPath)
	}
	st, err := store.Open(dbPath)
	if err != nil {
		fatal("open database", err)
	}
	defer st.Close()

	authSvc := authsvc.New(st, cfg)

	if *userReset {
		if err := authSvc.ResetToDefault(); err != nil {
			fatal("reset login", err)
		}
		fmt.Printf("Login reset to %s/%s — you'll be asked to set a new username and password on next sign-in.\n",
			authsvc.DefaultUsername, authsvc.DefaultPassword)
		return
	}
	if err := authSvc.EnsureDefault(); err != nil {
		fatal("seed default login", err)
	}

	svc := portfolio.New(st, cfg)

	if err := svc.BackfillQuotes(); err != nil {
		slog.Warn("backfill purchase quote currencies", "err", err)
	}
	if err := svc.NormalizeStakedCurrencies(); err != nil {
		slog.Warn("normalize staked currencies", "err", err)
	}

	go runPoller(svc, cfg)

	srv := web.NewServer(svc, authSvc, cfg.PollIntervalSeconds)
	addr := fmt.Sprintf(":%d", cfg.Port)
	slog.Info("cryptomon starting", "addr", addr, "data_dir", dataDir)
	if err := http.ListenAndServe(addr, srv.Handler()); err != nil {
		fatal("serve", err)
	}
}

func runPoller(svc *portfolio.Service, cfg *config.Config) {
	syncFast := func() {
		if err := svc.SyncTrades(); err != nil {
			slog.Error("sync trades", "err", err)
		}
		if err := svc.SyncTransfers(); err != nil {
			slog.Error("sync transfers", "err", err)
		}
		if err := svc.SyncBalance(); err != nil {
			slog.Error("sync balance", "err", err)
		}
		if err := svc.SyncPrices(); err != nil {
			slog.Error("sync prices", "err", err)
		}
	}
	syncSlow := func() {
		if err := svc.SyncHistory(); err != nil {
			slog.Error("sync history", "err", err)
		}
	}

	syncFast()
	syncSlow()

	fastTicker := time.NewTicker(time.Duration(cfg.PollIntervalSeconds) * time.Second)
	defer fastTicker.Stop()
	slowTicker := time.NewTicker(time.Duration(cfg.HistoryRefreshSeconds) * time.Second)
	defer slowTicker.Stop()

	for {
		select {
		case <-fastTicker.C:
			syncFast()
		case <-slowTicker.C:
			syncSlow()
		}
	}
}

func fatal(msg string, err error) {
	slog.Error(msg, "err", err)
	os.Exit(1)
}