package gameserver

import (
	"fmt"

	"gac-hkrpg-go/internal/common"
	pb "gac-hkrpg-go/protocol/proto"
	"google.golang.org/protobuf/proto"
)

// cwCapturedSupplyLayer obtains the empty Supply node container from the
// revision-bound native transition capture. It deliberately does not copy
// that capture's Supply options, queue, rewards or player-specific state.
// The current capture has an empty enemy-layer container with branch index 1;
// this is checked against the resource rather than assumed for future clients.
// A caller must also construct a valid Supply pending action before committing
// a transition; this helper alone does not make a Supply round playable.
func cwCapturedSupplyLayer(catalog *common.CurrencyWarsCatalog) (*pb.NCKOKDHNJDC, error) {
	if catalog == nil {
		return nil, fmt.Errorf("CW Supply catalog missing")
	}
	entries, err := cwNodeTransitions(catalog)
	if err != nil {
		return nil, err
	}
	var layer *pb.NCKOKDHNJDC
	for _, entry := range entries {
		level := new(pb.AINFNFIDGFF)
		pending := new(pb.CHCHAJIANIM)
		if err := proto.Unmarshal(entry.LevelWire, level); err != nil {
			return nil, fmt.Errorf("CW captured Supply level: %w", err)
		}
		if err := proto.Unmarshal(entry.RoundWire, pending); err != nil {
			return nil, fmt.Errorf("CW captured Supply pending: %w", err)
		}
		if pending.GetFIKAGBAEOAP() == nil {
			continue
		}
		if level.IMPNAHBCADN == nil {
			return nil, fmt.Errorf("CW captured Supply layer missing")
		}
		enemy := level.IMPNAHBCADN.GetMPOBBIPMNNJ()
		if enemy == nil || enemy.MOADBALHMFD != 1 || enemy.LNDKCPBJDKH != 0 || len(enemy.BPDABHGFBFO) != 0 {
			return nil, fmt.Errorf("CW captured Supply layer contains unexpected state")
		}
		if layer != nil && !proto.Equal(layer, level.IMPNAHBCADN) {
			return nil, fmt.Errorf("CW captured Supply layers disagree")
		}
		layer = level.IMPNAHBCADN
	}
	if layer == nil {
		return nil, fmt.Errorf("CW captured Supply layer unavailable")
	}
	return proto.Clone(layer).(*pb.NCKOKDHNJDC), nil
}