package main

import (
	"context"
	"errors"
	"flag"
	"log"
	"log/slog"
	"time"

	"git.cycore.io/scm/gcal-sync/config"
)

var configFile string
var debug bool
var interval time.Duration

func init() {
	flag.StringVar(&configFile, "config", "/etc/gcal-sync/config.yaml", "name of the file from which to load the configuration")
	flag.BoolVar(&debug, "debug", false, "enable debug logging")
	flag.DurationVar(&interval, "interval", 5*time.Minute, "refresh frequency")
}

func main() {
	ctx := context.Background()

	flag.Parse()

	if debug {
		slog.SetLogLoggerLevel(slog.LevelDebug)
	} else {
		slog.SetLogLoggerLevel(slog.LevelInfo)
	}

	cfg, err := config.Load(configFile)
	if err != nil {
		log.Fatalf("failed to load configuration file %s: %s", configFile, err.Error())
	}

	var failures error

	for _, item := range cfg.Calendars {
		if err := item.Sync(ctx, cfg); err != nil {
			slog.Error("failed to sync calendar",
				slog.String("name", item.Name),
				slog.String("error", err.Error()),
			)

			failures = errors.Join(failures, err)

			continue
		}

		slog.Debug("posted updated calendar data",
			slog.String("name", item.Name),
		)
	}

	for {
		if err := Sync(ctx, cfg); err != nil {
			slog.Warn("failed to sync all calendars")
		} else {
			slog.Info("synchronized all calendar data",
				slog.Int("count", len(cfg.Calendars)),
			)
		}

		time.Sleep(interval)
	}
}

func Sync(ctx context.Context, cfg *config.Config) error {
	var failures error

	for _, item := range cfg.Calendars {
		if err := item.Sync(ctx, cfg); err != nil {
			slog.Error("failed to sync calendar",
				slog.String("name", item.Name),
				slog.String("url", item.URL),
				slog.String("error", err.Error()),
			)

			failures = errors.Join(failures, err)

			continue
		}

		slog.Debug("posted updated calendar data",
			slog.String("name", item.Name),
		)
	}

	return failures
}