package mysql

import (
	"context"
	"database/sql"
	"errors"
	"strings"

	"hyapp/pkg/appcode"
	"hyapp/pkg/xerr"
	"hyapp/services/wallet-service/internal/domain/ledger"
)

type walletPolicyInstance struct {
	InstanceCode      string
	TemplateCode      string
	TemplateVersion   string
	RegionID          int64
	HostPointAsset    string
	HostPointRatioPPM int64
	PointsPerUSD      int64
	WithdrawFeeBPS    int64
}

func (r *Repository) resolveActiveWalletPolicy(ctx context.Context, tx *sql.Tx, appCode string, regionID int64, nowMS int64) (walletPolicyInstance, bool, error) {
	appCode = appcode.Normalize(appCode)
	if regionID < 0 {
		return walletPolicyInstance{}, false, xerr.New(xerr.InvalidArgument, "region_id is invalid")
	}
	row := tx.QueryRowContext(ctx, `
		SELECT instance_code, template_code, template_version, region_id, host_point_asset_type,
		       host_point_ratio_ppm, points_per_usd, withdraw_fee_bps
		FROM wallet_policy_instances
		WHERE app_code = ?
		  AND region_id IN (?, 0)
		  AND status = 'active'
		  AND effective_from_ms <= ?
		  AND (effective_to_ms = 0 OR effective_to_ms > ?)
		ORDER BY CASE WHEN region_id = ? THEN 0 ELSE 1 END, published_at_ms DESC, instance_code DESC
		LIMIT 1`,
		appCode, regionID, nowMS, nowMS, regionID,
	)
	var item walletPolicyInstance
	if err := row.Scan(&item.InstanceCode, &item.TemplateCode, &item.TemplateVersion, &item.RegionID, &item.HostPointAsset, &item.HostPointRatioPPM, &item.PointsPerUSD, &item.WithdrawFeeBPS); err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			return walletPolicyInstance{}, false, nil
		}
		return walletPolicyInstance{}, false, err
	}
	item.HostPointAsset = strings.ToUpper(strings.TrimSpace(item.HostPointAsset))
	if item.HostPointAsset == "" {
		item.HostPointAsset = ledger.AssetPoint
	}
	if item.HostPointAsset != ledger.AssetPoint || item.HostPointRatioPPM <= 0 || item.HostPointRatioPPM > 1_000_000 || item.PointsPerUSD <= 0 || item.WithdrawFeeBPS < 0 || item.WithdrawFeeBPS > 10_000 {
		return walletPolicyInstance{}, false, xerr.New(xerr.InvalidArgument, "wallet policy instance is invalid")
	}
	return item, true, nil
}