package productmember

import (
	"context"
	"fmt"

	"perms-system-server/internal/consts"

	"github.com/zeromicro/go-zero/core/stores/cache"
	"github.com/zeromicro/go-zero/core/stores/sqlx"
)

var _ SysProductMemberModel = (*customSysProductMemberModel)(nil)

type (
	SysProductMemberModel interface {
		sysProductMemberModel
		FindListByProductCode(ctx context.Context, productCode string, page, pageSize int64) ([]*SysProductMember, int64, error)
		// CountOtherActiveAdminsTx 统计"除 excludeId 这一行以外"的启用 ADMIN 数量，是
		// "不能移除/降级最后一个 admin"这条不变式的唯一出口。之前同批引入的
		// CountActiveAdminsTx（不带 Other）业务层零调用（调用方反向推导更绕且易错），
		// 审计 L-2 要求直接删除以收敛接口 surface area、规避"应该用哪一个"的歧义。
		CountOtherActiveAdminsTx(ctx context.Context, session sqlx.Session, productCode string, excludeId int64) (int64, error)
		FindOneForUpdateTx(ctx context.Context, session sqlx.Session, id int64) (*SysProductMember, error)
	}

	customSysProductMemberModel struct {
		*defaultSysProductMemberModel
	}
)

func NewSysProductMemberModel(conn sqlx.SqlConn, c cache.CacheConf, cachePrefix string, opts ...cache.Option) SysProductMemberModel {
	return &customSysProductMemberModel{
		defaultSysProductMemberModel: newSysProductMemberModel(conn, c, cachePrefix, opts...),
	}
}

func (m *customSysProductMemberModel) FindListByProductCode(ctx context.Context, productCode string, page, pageSize int64) ([]*SysProductMember, int64, error) {
	var total int64
	countQuery := fmt.Sprintf("SELECT COUNT(*) FROM %s WHERE `productCode` = ?", m.table)
	if err := m.QueryRowNoCacheCtx(ctx, &total, countQuery, productCode); err != nil {
		return nil, 0, err
	}

	var list []*SysProductMember
	query := fmt.Sprintf("SELECT %s FROM %s WHERE `productCode` = ? ORDER BY id DESC LIMIT ?,?", sysProductMemberRows, m.table)
	if err := m.QueryRowsNoCacheCtx(ctx, &list, query, productCode, (page-1)*pageSize, pageSize); err != nil {
		return nil, 0, err
	}

	return list, total, nil
}

// CountOtherActiveAdminsTx 统计"除 excludeId 这一行以外"的启用 ADMIN 数量。调用方一般把即将被删除
// 或即将被降级的目标行 id 传进来；返回 0 即表示目标是最后一个 active admin，不能动。相比
// CountActiveAdminsTx + adminCount <= 1 的反向推理，语义更贴合业务（见审计 L-5 / L-2）。
// 仍然使用 FOR UPDATE 锁住扫描范围，串行化与并发降级/删除的冲突。
func (m *customSysProductMemberModel) CountOtherActiveAdminsTx(ctx context.Context, session sqlx.Session, productCode string, excludeId int64) (int64, error) {
	var ids []int64
	query := fmt.Sprintf("SELECT `id` FROM %s WHERE `productCode` = ? AND `memberType` = ? AND `status` = ? AND `id` != ? FOR UPDATE", m.table)
	if err := session.QueryRowsCtx(ctx, &ids, query, productCode, consts.MemberTypeAdmin, consts.StatusEnabled, excludeId); err != nil {
		return 0, err
	}
	return int64(len(ids)), nil
}

func (m *customSysProductMemberModel) FindOneForUpdateTx(ctx context.Context, session sqlx.Session, id int64) (*SysProductMember, error) {
	var data SysProductMember
	query := fmt.Sprintf("SELECT %s FROM %s WHERE `id` = ? FOR UPDATE", sysProductMemberRows, m.table)
	if err := session.QueryRowCtx(ctx, &data, query, id); err != nil {
		return nil, err
	}
	return &data, nil
}