package dnfbridge

import (
	"context"
	"fmt"
)

// sendCurrentChannelReconnectTownEntry rebuilds the selected actor after the
// target-channel transport reconnect. An account-bound connection that
// completed CHANNELINFO must use the same u8 channel in every town mode0/mode1
// row; legacy/high-id fallbacks retain context zero. The connection bootstrap
// already owns the one allowed class0/op1 and endpoint success.
func (s *Service) sendCurrentChannelReconnectTownEntry(session *gameSession) error {
	if s == nil || session == nil || !session.channelReconnect || session.selectedCharacterID == 0 {
		return nil
	}
	if session.residentChannel.ID <= 0 || session.residentChannel.ID != session.channel.ID {
		return fmt.Errorf(
			"channel reconnect has no committed target identity: connected=%d resident=%d",
			session.channel.ID,
			session.residentChannel.ID,
		)
	}
	ownerChannel := currentConnectionTownActorOwnerContext(session)
	session.townActorOwnerChannel = ownerChannel
	ctx, cancel := context.WithTimeout(context.Background(), createWriteTimeout)
	defer cancel()
	characterID, characterName, character, hasCharacter := s.selectedCharacterForEnter(ctx, session)
	if characterID == 0 || characterID != session.selectedCharacterID || !hasCharacter {
		return fmt.Errorf(
			"channel reconnect selected character mismatch: selected=%d loaded=%d found=%t",
			session.selectedCharacterID,
			characterID,
			hasCharacter,
		)
	}
	character, townID, areaID, row, mapPath, err := s.currentChannelReconnectTownTransition(
		ctx,
		session,
		characterID,
		character,
	)
	if err != nil {
		return fmt.Errorf("load persisted channel reconnect location: %w", err)
	}
	transitionBody, err := buildCurrentSceneTransitionBody(
		townID,
		areaID,
		[]currentSceneTransitionRow{row},
	)
	if err != nil {
		return err
	}
	objectBody := s.buildCurrentSceneObjectListBodyForSessionInContext(
		ctx,
		session,
		characterID,
		characterName,
		character,
		hasCharacter,
		ownerChannel,
	)
	adventureSummary := s.currentAccountAdventureGroupSummaryForPacket(ctx, session, character, hasCharacter)
	mode1Body := s.buildCurrentActorBindingMode1BodyForSelectedInContext(
		ctx,
		session,
		character,
		hasCharacter,
		characterID,
		uint32(adventureSummary.ManageLevel),
		ownerChannel,
	)

	session.townMu.Lock()
	// Preserve an in-progress route so a failed post-op24 skill write resumes
	// from TransitionSent. A completed route or another actor starts fresh.
	resumeRoute := session.initialTownRouteCharacterID == characterID &&
		session.initialTownRouteStage >= currentInitialTownRouteArmed &&
		session.initialTownRouteStage < currentInitialTownRoutePlayerStateSent
	if !resumeRoute {
		resetCurrentTownPostTransitionPlayerState(session)
		session.initialTownRouteCharacterID = characterID
		session.initialTownRouteStage = currentInitialTownRouteArmed
		session.initialTownActorSceneSnapshotSent = false
		session.initialTownLocationNotificationsSent = false
		session.initialTownQuestSnapshotsSent = false
		session.initialTownQuestHUDRefreshSent = false
		session.initialTownGuildStateProjectionSent = false
		session.initialTownSkillInfoPrepared = false
		session.initialTownSkillInfoSent = false
		session.initialTownSkillInfo = currentSceneSkillInfoProjection{}
		session.initialTownMode3RefreshPending = false
		session.completedTownReturnBuffRegistrationPending = false
		session.initialTownLegacySceneReadyAccepted = false
		clearCurrentGameOptionRestoreSnapshot(session)
		clearCurrentCharacterOptionRestoreSnapshot(session)
		session.initialTownAdventureOverheadRefreshSent = false
		session.initialTownCombatPowerAffixesSent = false
		session.initialTownMoodProjectionSent = false
	} else {
		s.logGameEvent(session, "game-channel-reconnect-town-entry-resume",
			"char_id", characterID,
			"route_stage", session.initialTownRouteStage,
			"skill_info_prepared", session.initialTownSkillInfoPrepared,
			"reason", "same_actor_route_retry_preserves_transition_cursor_and_prepared_post_op24_skill")
	}
	session.townActorOwnerChannel = ownerChannel

	endpointPolicy := "proactive_class1_op1_context0_no_route_replay"
	if session.currentChannelResidentNoticeSent {
		endpointPolicy = "channelinfo_then_single_requested_class1_op1_no_route_replay"
	}
	s.logGameEvent(session, "game-channel-reconnect-town-entry-send",
		"char_id", characterID,
		"target_channel", session.channel.ID,
		"target_owner_channel", ownerChannel,
		"owner_server", 0,
		"owner_channel", ownerChannel,
		"town_id", townID,
		"area_id", areaID,
		"position_x", row.Value1,
		"position_y", row.Value2,
		"direction", row.Value3,
		"area_state", row.Value4,
		"map_path", mapPath,
		"sequence", "op376_mode0_light_mode1_op800_full_town_init_op124_op9_op120_op22_op23_op24_op21_op574",
		"resident_notice_sent", session.currentChannelResidentNoticeSent,
		"endpoint_policy", endpointPolicy)
	if err := s.sendCurrentChannelReconnectTownActorRoutePacketsLocked(
		session,
		characterID,
		townID,
		areaID,
		row,
		objectBody,
		mode1Body,
		transitionBody,
	); err != nil {
		session.townMu.Unlock()
		return err
	}
	routeStage := session.initialTownRouteStage
	questSnapshotsSeeded := session.initialTownQuestSnapshotsSent
	session.townMu.Unlock()
	s.publishCurrentTownPresence(
		session,
		character,
		townID,
		areaID,
		row,
		0,
		mapPath,
		"channel_reconnect_town_actor_route_complete",
	)

	// The pre-op24 pair seeds the task manual while the actor is being rebuilt.
	// Refresh it once more after the actor-ready boundary so NPC markers reflect
	// repository/PVF state without accepting or completing a quest.
	if routeStage >= currentInitialTownRouteTransitionSent && questSnapshotsSeeded {
		if err := s.sendCurrentAcceptableQuestListForSession(
			session,
			"channel_reconnect_post_op24_actor_ready_refresh",
		); err != nil {
			return err
		}
	}
	if err := s.sendSelectedActorUserStateRefreshIfNonDefault(
		session,
		"channel_reconnect_post_op24_actor_ready_user_state",
	); err != nil {
		return err
	}
	// Team-channel owners rebuild/clear the native activity table. The new
	// ordinary-channel session is armed during character rebinding and must
	// restore the complete op108 catalog after op24, followed immediately by its
	// normal op1206/op1303 projections. Other reconnects remain progress-only.
	if err := s.sendCurrentSpendTimeInitialStateOnce(
		session,
		"channel_reconnect_post_op24_activity_state",
	); err != nil {
		return err
	}
	// Channel reconnect has its own complete actor route and never enters the
	// deferred select-scene tail. Replay the collection-box cache at this real
	// scene-ready boundary so the target channel receives both the selected Orc
	// Guardian page and the repository-backed state used by its mode-1 stats.
	if err := s.sendCollectboxSceneInitializationStates(ctx, session); err != nil {
		s.logGameEvent(session, "game-collectbox-scene-init-status-deferred", "char_id", session.selectedCharacterID, "source", "channel_reconnect_scene_ready", "reason", err)
	}
	session.channelReconnect = false
	session.channelReconnectNewCharacter = false
	session.sceneBootstrapTailDeferred = false
	session.sceneBootstrapTailSent = true
	session.townActorOwnerChannel = ownerChannel
	s.logGameEvent(session, "game-channel-reconnect-town-entry-finished",
		"char_id", characterID,
		"target_channel", session.channel.ID,
		"route_stage", routeStage,
		"resident_notice_sent", session.currentChannelResidentNoticeSent,
		"town_actor_owner_channel", session.townActorOwnerChannel,
		"report_client_spec_sent", true,
		"final_packet", "class0_op574_post_op24_actor_ready_refresh")
	return nil
}