package remind

import (
	"errors"
	"log"
	"time"

	"git.fromouter.space/crunchy-rocks/clessy-ng/modules"
	"git.fromouter.space/crunchy-rocks/clessy-ng/utils"

	"git.fromouter.space/hamcha/tg"
	"git.sr.ht/~hamcha/containers"
	"github.com/cockroachdb/pebble"
)

type Reminder struct {
	ReminderID string
	TargetID   int64
	When       int64
	Text       string
	Reference  *ReminderReference
}

type ReminderReference struct {
	Chat    int64
	Message int64
}

const reminderKey = "mod/reminder/pending"
const reminderMaxDuration = time.Hour * 24 * 30 * 3

var defaultLocation *time.Location = nil

var pending = containers.NewRWSyncMap[string, Reminder]()

type Module struct {
	client *tg.Telegram
	name   string
	kv     *pebble.DB
}

func (m *Module) Initialize(options modules.ModuleOptions) error {
	m.client = options.API
	m.name = options.Name
	m.kv = options.KV

	var err error
	defaultLocation, err = time.LoadLocation("Europe/Rome")
	if err != nil {
		log.Fatalf("[remind] Something is really wrong: %s\n", err.Error())
		return err
	}

	var reminders map[string]Reminder
	err = utils.ReadJSON(m.kv, reminderKey, &reminders)
	if err != nil {
		if !errors.Is(err, pebble.ErrNotFound) {
			log.Println("[remind] WARN: Could not load pending reminders (db error): " + err.Error())
			return err
		}
	}

	// Fix old reminders
	dirty := false
	for reminderID, reminder := range reminders {
		if reminder.ReminderID == "" {
			reminder.ReminderID = reminderID
			dirty = true
		}
	}
	if dirty {
		m.save()
	}

	// Set schedule
	for id, reminder := range reminders {
		pending.SetKey(id, reminder)
		go m.schedule(id)
	}
	log.Printf("[remind] Loaded %d pending reminders\n", len(reminders))

	return nil
}

func (m *Module) OnUpdate(update tg.APIUpdate) {
	// Check for updates to existing messages
	if update.Callback != nil {
		m.handleCallback(update.Callback)
	}

	if utils.IsCommand(update, m.name, "ricordami") || utils.IsCommand(update, m.name, "remind") {
		m.cmdRicordami(update.Message)
		return
	}

	if utils.IsCommand(update, m.name, "reminders") {
		m.cmdReminder(update.Message)
		return
	}
}