package db

import "strings"

// quoteMySQLIdent 反引号标识符转义:内部反引号加倍(“),与前端 sql.ts quoteIdent 对齐。
func quoteMySQLIdent(s string) string {
	return "`" + strings.ReplaceAll(s, "`", "``") + "`"
}

func quotePGIdent(s string) string {
	return `"` + strings.ReplaceAll(s, `"`, `""`) + `"`
}

// quoteIdentFor 按驱动族引用标识符:mysql 反引号加倍、pg/sqlite 双引号加倍、
// mssql 中括号加倍、oracle 沿用原名(大写约定)。
func quoteIdentFor(driver, name string) string {
	switch {
	case isMySQLFamily(driver):
		return quoteMySQLIdent(name)
	case isMSSQL(driver):
		return "[" + strings.ReplaceAll(name, "]", "]]") + "]"
	case driverKey(driver) == "oracle":
		return name
	case driverKey(driver) == "sqlite":
		return quoteSQLiteIdent(name)
	default:
		return quotePGIdent(name)
	}
}

// quoteTableNameFor 引用表名(支持 schema.table 多段,oracle 除外沿用原名)。
func quoteTableNameFor(driver, table string) string {
	if driverKey(driver) == "oracle" {
		return table
	}
	parts := strings.Split(table, ".")
	for i := range parts {
		parts[i] = quoteIdentFor(driver, parts[i])
	}
	return strings.Join(parts, ".")
}

func splitSchemaTable(name string) (schema, table string) {
	name = strings.TrimSpace(name)
	if i := strings.LastIndex(name, "."); i > 0 {
		return name[:i], name[i+1:]
	}
	return "", name
}