package model

import (
	"context"
	"fmt"

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

var _ TDirectoryModel = (*customTDirectoryModel)(nil)

type (
	// TDirectoryModel is an interface to be customized, add more methods here,
	// and implement the added methods in customTDirectoryModel.
	TDirectoryModel interface {
		tDirectoryModel
		FindPage(ctx context.Context, page, pageSize int64) ([]TDirectory, int64, error)
		FindDirsByServiceId(ctx context.Context, serviceId int64) ([]string, error)
		DeleteByServiceId(ctx context.Context, serviceId int64) error
		WithSession(session sqlx.Session) TDirectoryModel
	}

	customTDirectoryModel struct {
		*defaultTDirectoryModel
	}
)

// NewTDirectoryModel returns a model for the database table.
func NewTDirectoryModel(conn sqlx.SqlConn) TDirectoryModel {
	return &customTDirectoryModel{
		defaultTDirectoryModel: newTDirectoryModel(conn),
	}
}

func (m *customTDirectoryModel) FindPage(ctx context.Context, page, pageSize int64) ([]TDirectory, int64, error) {
	var total int64
	if err := m.conn.QueryRowCtx(ctx, &total, fmt.Sprintf("select count(*) from %s", m.table)); err != nil {
		return nil, 0, err
	}

	if total == 0 {
		return nil, 0, nil
	}

	offset := (page - 1) * pageSize
	query := fmt.Sprintf("select %s from %s order by `id` limit ? offset ?", tDirectoryRows, m.table)
	var resp []TDirectory
	if err := m.conn.QueryRowsCtx(ctx, &resp, query, pageSize, offset); err != nil {
		return nil, 0, err
	}

	return resp, total, nil
}

// FindDirsByServiceId 查询某个服务下全部保护目录路径(剔除空值),
// 删除服务前的联动卸载用它拿到要卸载的挂载点清单。
func (m *customTDirectoryModel) FindDirsByServiceId(ctx context.Context, serviceId int64) ([]string, error) {
	// 查全列扫描进 struct 切片(与 FindPage 同款成熟模式),再抽取 directory 字符串
	query := fmt.Sprintf("select %s from %s where `service_id` = ?", tDirectoryRows, m.table)
	var resp []TDirectory
	if err := m.conn.QueryRowsCtx(ctx, &resp, query, serviceId); err != nil {
		return nil, err
	}
	dirs := make([]string, 0, len(resp))
	for _, d := range resp {
		if d.Directory.Valid && d.Directory.String != "" {
			dirs = append(dirs, d.Directory.String)
		}
	}
	return dirs, nil
}

// DeleteByServiceId 删除某个服务下的全部保护目录,配合服务删除做级联清理。
func (m *customTDirectoryModel) DeleteByServiceId(ctx context.Context, serviceId int64) error {
	query := fmt.Sprintf("delete from %s where `service_id` = ?", m.table)
	_, err := m.conn.ExecCtx(ctx, query, serviceId)
	return err
}

func (m *customTDirectoryModel) WithSession(session sqlx.Session) TDirectoryModel {
	return NewTDirectoryModel(sqlx.NewSqlConnFromSession(session))
}