package main

import (
	"database/sql"
	"fmt"

	_ "github.com/microsoft/go-mssqldb"
)

type Column struct {
	Name               string
	TypeName           string
	MaxCharacterLength *int
}

func fetchTableMetadata() ([]Column, error) {
	connStr := fmt.Sprintf("server=%s;user id=%s;password=%s;port=%d;database=%s;encrypt=disable",
		host, username, password, port, dbname)

	db, err := sql.Open("sqlserver", connStr)
	if err != nil {
		return nil, err
	}
	defer db.Close()

	query := `
		SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH
		FROM INFORMATION_SCHEMA.COLUMNS 
		WHERE TABLE_NAME = @tableName;
	`

	var columns []Column

	rows, err := db.Query(query, sql.Named("tableName", table))
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	for rows.Next() {
		var col Column
		err = rows.Scan(&col.Name, &col.TypeName, &col.MaxCharacterLength)
		if err != nil {
			return nil, err
		}
		columns = append(columns, col)
	}

	return columns, nil
}