package channelbridge

import (
	"context"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/adapter"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/session"
	"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
}

// SetOnRejected wires (or replaces) the hook called after a message is dropped by
// the allow/deny black-or-white lists (design/16 §4.6 §6). The composition root
// routes it into the gateway audit trail. It is a no-op-safe call and is safe for
// concurrent use with in-flight processing.
func (b *Bridge) SetOnRejected(fn func(adapter.UnifiedMessage, string)) {
	b.mu.Lock()
	defer b.mu.Unlock()
	b.onRejected = fn
}

// notifyPersisted hands a just-persisted message to the transport hook when one is
// wired, so the gateway can broadcast a `message_persisted` (web chat) or
// `channel_persisted` (IM adapter log) event for cross-end realtime 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. adapterID is the account adapter registration name that received the message
// (e.g. "kook:3bef..."), so the admin log can query a per-adapter send/receive stream;
// it is empty for Web-originated messages. 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, adapterID 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, AdapterID: adapterID,
	})
	if err != nil {
		b.log.Warn("persist main session", "err", err, "role", role, "platform", platform, "device_id", deviceID, "adapter", adapterID)
		return
	}
	b.notifyPersisted(full)
}

// persistIsolated writes one message into a restricted (group / stranger) session's
// own platform log (design/16 §4.6 §4): the message lands in the isolated sess-xxx
// session (NOT the main web session) and carries the channel platform, the client
// deviceID, the sender's display name and the account adapter registration name, so
// the IM adapter log page can render the non-owner message stream per adapter config.
// The message is still NOT mirrored into the Web main session (only owner-private
// messages mirror to the Web); it is merely handed to the transport hook so the
// gateway broadcasts a `channel_persisted` event and the IM adapter log page appends
// it without a refresh. It is a no-op when no history store is wired, so the bridge
// runs unchanged without storage.
func (b *Bridge) persistIsolated(ctx context.Context, role, content, deviceID string, sess session.Session, platform, senderName, adapterID string) {
	if b.history == nil {
		return
	}
	full, err := b.history.AppendFull(ctx, history.Message{
		SessionID: sess.SessionID, Role: role, Content: content, Platform: platform,
		DeviceID: deviceID, SenderName: senderName, AdapterID: adapterID,
	})
	if err != nil {
		b.log.Warn("persist isolated session", "err", err, "role", role,
			"session", sess.SessionID, "platform", platform, "sender_name", senderName, "adapter", adapterID)
		return
	}
	// Broadcast the isolated write as a `channel_persisted` event so the IM adapter
	// log page appends it in realtime. The gateway splits the event type by session:
	// this is NOT the main web session, so the web chat has no handler for it and the
	// message itself still lands only in the isolated sess-xxx session (never the
	// main/`web` session, design/16 §4.6 §3).
	b.notifyPersisted(full)
}