package poster

import (
	"log/slog"
	"sync"
	"time"

	"pete/internal/storage"

	"maunium.net/go/mautrix/id"
)

// ReactionCallback is an optional hook fired after a reaction is recorded.
// Used to wire reaction-driven features (e.g. ❓ → summary) without coupling
// poster to those packages.
type ReactionCallback func(roomID id.RoomID, targetEventID id.EventID, guid, channel, emoji string)

var (
	reactionCallbackMu sync.RWMutex
	reactionCallback   ReactionCallback
)

// SetReactionCallback installs a hook called after every recorded reaction.
// Pass nil to clear. Safe to call before or after the matrix client starts.
func SetReactionCallback(fn ReactionCallback) {
	reactionCallbackMu.Lock()
	reactionCallback = fn
	reactionCallbackMu.Unlock()
}

// HandleReaction processes a reaction event by mapping it back to the story GUID.
func HandleReaction(roomID id.RoomID, eventID id.EventID, targetEventID id.EventID, emoji string, userID id.UserID) {
	guid, channel, found := storage.LookupPostGUID(string(targetEventID))
	if !found {
		// Reaction on a message we didn't post — ignore
		return
	}

	storage.InsertReaction(guid, channel, string(eventID), emoji, string(userID), time.Now().Unix())
	slog.Debug("reaction recorded",
		"guid", guid,
		"channel", channel,
		"emoji", emoji,
		"user", userID,
	)

	reactionCallbackMu.RLock()
	cb := reactionCallback
	reactionCallbackMu.RUnlock()
	if cb != nil {
		go cb(roomID, targetEventID, guid, channel, emoji)
	}
}