package channelbridge

import (
	"context"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/history"
)

// This file holds the channelbridge's chat-history persistence hooks (design/16
// §4.4): an owner private chat is routed INTO the single main web session and
// tagged with the channel platform, then broadcast so the Web client mirrors it
// without a refresh. Kept separate from channelbridge.go so the bridge's inbound
// pipeline file stays under the module size bound.

// SetOnPersisted wires (or replaces) the transport hook called after an
// owner-private message is persisted into the main web session. The gateway is
// built after the bridge in the composition root, so the hook is attached post-New
// through this setter; it is a no-op-safe call and is safe for concurrent use with
// in-flight processing.
func (b *Bridge) SetOnPersisted(fn func(history.Message)) {
	b.mu.Lock()
	defer b.mu.Unlock()
	b.onPersisted = fn
}

// notifyPersisted hands a just-persisted message to the transport hook when one is
// wired, so the gateway can broadcast `message_persisted` for cross-end sync.
func (b *Bridge) notifyPersisted(msg history.Message) {
	b.mu.RLock()
	fn := b.onPersisted
	b.mu.RUnlock()
	if fn != nil {
		fn(msg)
	}
}

// persistToMain writes one message into the main web session with an explicit source
// platform and client deviceID, then notifies the transport hook so Web clients receive
// a `message_persisted` event without a refresh (design/16 §4.4). deviceID is the
// concrete client that sent the message (design/16 §4.5) — e.g. "weixin-ilink:conf0:wx_uid"
// for IM. It is a no-op when no history store is wired, so the bridge runs unchanged
// without storage.
func (b *Bridge) persistToMain(ctx context.Context, role, content, platform, deviceID string) {
	if b.history == nil {
		return
	}
	full, err := b.history.AppendFull(ctx, history.Message{
		SessionID: history.MainSessionID, Role: role, Content: content, Platform: platform, DeviceID: deviceID,
	})
	if err != nil {
		b.log.Warn("persist main session", "err", err, "role", role, "platform", platform, "device_id", deviceID)
		return
	}
	b.notifyPersisted(full)
}